CN121282811B - Traction substation voltage intelligent monitoring switching device and method - Google Patents
Traction substation voltage intelligent monitoring switching device and methodInfo
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Abstract
本发明公开了牵引变电所电压智能监测切换装置及方法，涉及铁路牵引供电技术领域，牵引变电所每段母线设置主用电压互感器和备用电压互感器，对于每个电压互感器分别设有电压互感器故障监测模块，每个电压互感器故障监测模块均包括有压判别电路、电压曾正常判别电路、无压判别电路、电压值偏低判别电路、电压差偏高判别电路、电压互感器异常判别电路以及电压互感器正常判别电路，电压自动投切装置根据每个电压互感器故障监测模块输出的电压互感器异常信号或电压互感器正常信号判断是否对当前运行的电压互感器进行切换。根据电压互感器曾正常标志综合判断电压互感器是否异常，从而确定所使用的电压互感器故障，自动投入备用电压互感器。
This invention discloses an intelligent voltage monitoring and switching device and method for traction substations, relating to the field of railway traction power supply technology. Each busbar section of the traction substation is equipped with a primary voltage transformer and a backup voltage transformer. Each voltage transformer is equipped with a voltage transformer fault monitoring module, which includes a voltage presence detection circuit, a voltage normality detection circuit, a voltage absence detection circuit, a low voltage value detection circuit, a high voltage difference detection circuit, a voltage transformer abnormality detection circuit, and a voltage transformer normality detection circuit. The automatic voltage switching device determines whether to switch the currently operating voltage transformer based on the voltage transformer abnormality signal or voltage transformer normality signal output by each voltage transformer fault monitoring module. By comprehensively judging whether the voltage transformer is abnormal based on the voltage transformer's previously normal status indicator, a fault is determined in the voltage transformer in use, and the backup voltage transformer is automatically switched on.
Description
Technical Field
The invention relates to the technical field of railway traction power supply, in particular to an intelligent traction substation voltage monitoring and switching device and method.
Background
In a railway traction power supply system, devices such as traction network feeder line protection and fault ranging are required to collect bus voltage data, and bus voltage is the basis of protection action and ranging calculation during faults. In actual operation, the high-voltage side fuse is arranged on the 27.5kV voltage transformer, and the fuse is of a porcelain tube quartz sand fuse structure, after the fuse is fused, the fracture is small, and high induced voltage still exists. Under the condition of a fuse fault, after protection tripping, voltage data acquisition is abnormal, and distance measurement error is increased, so that judgment and emergency treatment during the fault are affected.
Disclosure of Invention
The invention aims to provide an intelligent monitoring and switching device and method for voltage of a traction substation, which comprehensively judges whether the voltage transformer is abnormal according to a normal sign of the voltage transformer, so that the fault of the used voltage transformer or the fusion of a high-voltage fuse and a low-voltage fuse is determined, and then the standby voltage transformer is automatically put into.
In order to achieve the above object, the present application provides the following solutions:
On the one hand, the invention provides a traction substation voltage intelligent monitoring switching device, which comprises a voltage automatic switching device, wherein each section of bus of the traction substation is provided with a main voltage transformer and a standby voltage transformer, each voltage transformer is respectively provided with a voltage transformer fault monitoring module, each voltage transformer fault monitoring module comprises a voltage judging circuit, a voltage once normal judging circuit, a no-voltage judging circuit, a voltage value lower judging circuit, a voltage difference higher judging circuit, a voltage transformer abnormal judging circuit and a voltage transformer normal judging circuit, wherein:
the voltage judging circuit triggers a voltage action signal;
The voltage-normal judging circuit triggers a voltage transformer normal signal according to the voltage action signal;
The no-voltage judging circuit triggers a no-voltage action signal according to the normal signal of the voltage transformer;
the low voltage value judging circuit triggers a low voltage signal according to a normal signal of the voltage transformer;
The voltage difference high judging circuit triggers a voltage difference high signal according to a normal signal of the voltage transformer;
the voltage transformer abnormality judging circuit triggers a voltage transformer abnormality signal according to the no-voltage action signal, the voltage lower signal and the voltage difference higher signal;
The normal judging circuit of the voltage transformer triggers the normal signal of the voltage transformer according to the voltage action signal, the non-voltage action signal, the voltage lower signal and the voltage difference higher signal;
the automatic voltage switching device judges whether to switch the currently operated voltage transformer according to the abnormal signal or the normal signal of the voltage transformer output by each voltage transformer fault monitoring module.
In some embodiments, the voltage discriminating circuit includes a first voltage comparator for comparing the fundamental component of the input bus voltage with a voltage setting value, a first AND logic device for performing AND logic processing on the output result of the first voltage comparator and the input signal of the voltage soft pressing plate, and a second voltage operating signal for outputting the output result of the first AND logic device after a set time period.
In some specific embodiments, when the fundamental component of the input bus voltage is greater than or equal to a voltage setting value, outputting a voltage action signal, and when the voltage normal judging circuit receives the voltage action signal, setting a voltage transformer normal sign and outputting a voltage transformer normal signal;
when the fundamental component of the input bus voltage is lower than the non-voltage setting value, the voltage once normal judges that the circuit instantaneous reset voltage transformer once normal marks.
In some specific embodiments, the no-voltage judging circuit comprises a second voltage comparator for comparing the input voltage fundamental component of the voltage transformer with a no-voltage setting value, a second AND logic device for AND logic processing the output result of the second voltage comparator, the voltage transformer normal signal and the no-voltage no-operation signal, and the second AND logic device for outputting a no-voltage starting signal, and the no-voltage starting signal is output after a set time limit.
In some specific embodiments, the low voltage value distinguishing circuit comprises a first current comparator for comparing the absolute value of the difference value of the T line bus current and the F line bus current of the input main voltage transformer with the maximum value of the bus load current, and a second current comparator for comparing the absolute value of the difference value of the T line bus current and the F line bus current of the input standby voltage transformer with the maximum value of the bus load current, and an output result of the first current comparator and an output result of the second current comparator are subjected to OR logic processing or a first logic device;
The voltage comparator III is used for triggering the soft pressing plate with a lower voltage value and a lower voltage value of the soft pressing plate input signal and comparing the input bus voltage value with the minimum bus voltage value;
And a AND logic device III which performs AND logic processing on the input signal of the soft pressing plate with the lower voltage value, the normal signal of the voltage transformer, or the output result of the first logic device and the output result of the third voltage comparator, and outputs a voltage lower signal after the set time limit is passed on the output result of the AND logic device III.
In some embodiments, the high voltage difference discriminating circuit includes a high voltage difference soft platen that triggers a high voltage difference soft platen input signal,
A voltage comparator IV for comparing the absolute value of the voltage difference obtained by calculating the difference between the input T-line bus voltage of the main voltage transformer and the T-line bus voltage of the standby voltage transformer with the set inherent error value;
a fifth voltage comparator for comparing the ratio obtained by dividing the input T-line bus voltage of the standby voltage transformer with the T-line bus voltage of the main voltage transformer with the set voltage comparison coefficient;
And a AND logic device IV for performing AND logic processing on the soft pressing plate input signal with the high voltage difference, the normal signal of the voltage transformer, the output result of the voltage comparator IV and the output result of the voltage comparator V, and outputting the high voltage difference signal after the set time limit is passed on the output result of the AND logic device IV.
In some embodiments, the voltage transformer abnormality determination circuit includes a second or logic device that performs an or logic operation on the no-voltage operation signal, the low voltage signal, and the high voltage difference signal, and outputs a voltage transformer abnormality signal.
In some embodiments, the voltage transformer normal discrimination circuit includes a non-logic device one for non-logic processing of the voltage low signal,
The non-logic device II performs non-logic processing on the non-voltage action signal, the non-logic device III performs non-logic processing on the signal with higher voltage difference, the AND logic device five performs AND logic processing on the non-logic device I output, the non-logic device II output, the non-logic device III output and the voltage action signal, and the AND logic device five outputs a normal signal of the voltage transformer.
In some embodiments, the automatic voltage switching device comprises a T-line voltage mutual automatic switching hard press plate for triggering the T-line voltage mutual automatic switching hard press plate input signal, and a T-line bus voltage automatic switching soft press plate for triggering the T-line bus voltage automatic switching soft press plate input signal;
If the main voltage transformer is currently operated, when receiving a T line voltage mutual automatic switching hard pressing plate input signal, a T line bus voltage automatic switching soft pressing plate input signal, a TF line bus separation non-positioning signal, a main voltage transformer abnormal signal and a standby voltage transformer normal signal, outputting a voltage switching signal, and automatically switching to the standby voltage transformer.
In a second aspect, the application provides an intelligent monitoring and switching method for voltage of a traction substation, which specifically comprises the following steps:
s1, respectively acquiring bus voltage fundamental wave components of a currently operated voltage transformer and a standby voltage transformer, respectively monitoring operation states of the two voltage transformers, wherein the monitoring method comprises the following steps:
S11, outputting a voltage action signal and juxtaposing a voltage normal sign of a voltage transformer when the fundamental component of the bus voltage is larger than a voltage setting value, and resetting the voltage normal sign of the voltage transformer currently running instantaneously when the fundamental component of the bus voltage is lower than a non-voltage setting value;
s12, judging whether the voltage transformer does not act under voltage, whether the voltage value is lower or not and whether the voltage difference is higher or not according to the voltage normal sign of the voltage transformer;
S13, when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value and high voltage difference, the output voltage transformer is abnormal, and when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value, low voltage difference and high voltage action, the output voltage transformer is normal;
s2, if the running state of the currently running voltage transformer is abnormal and the running state of the standby voltage transformer is normal, the voltage automatic switching device switches the currently running voltage transformer to the standby voltage transformer.
The invention has the beneficial effects that:
The method is characterized in that the voltage curve, relevant fault waveforms and other data of 27.5kV bus voltages AT traction substation, subareas, AT premises and the like in the fuse fault period are analyzed, voltage change characteristics of the fuse in the fuse fault period are extracted by combining voltage switching rules, voltage comparison is carried out, and a method for comparing primary and standby PT voltage waveforms or difference change trends is designed by combining the voltage characteristics of the fuse in the fuse fault state, so that a voltage transformer with the fuse fault is located. The intelligent monitoring device does not need to have a power failure at the high-voltage side, does not need to be directly detected at the high-voltage side, cannot cause any influence on the original equipment and circuits when the intelligent monitoring device operates, and automatically inputs the standby voltage transformer after determining the fault of the used voltage transformer or the fusion of the high-voltage fuse and the low-voltage fuse.
Drawings
Fig. 1 is a schematic diagram of a logic circuit of an intelligent traction substation voltage monitoring and switching device according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an abnormality discrimination principle of a voltage transformer according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a press discrimination according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of non-pressure discrimination according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the low voltage value judgment provided by the embodiment of the invention;
FIG. 6 is a schematic diagram of the discrimination of a higher voltage difference provided by the embodiment of the invention;
fig. 7 is a schematic diagram of anomaly discrimination of a voltage transformer according to an embodiment of the present invention;
Fig. 8 is a principle of normal discrimination of the voltage transformer provided by the embodiment of the invention;
FIG. 9 is a schematic diagram of a voltage switching secondary scheme according to an embodiment of the present invention;
FIG. 10 is a logic diagram of an automatic voltage switching operation according to an embodiment of the present invention;
FIG. 11 is a diagram illustrating a determination of a higher voltage angle difference according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
In addition, descriptions of well-known structures, functions and configurations may be omitted for clarity and conciseness. Those of ordinary skill in the art will recognize that various changes and modifications of the examples described herein can be made without departing from the spirit and scope of the present disclosure.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
Example 1
As shown in fig. 1, this embodiment provides a traction substation voltage intelligent monitoring switching device, including the automatic switching device of voltage, each section busbar of traction substation sets up main voltage transformer and reserve voltage transformer, is equipped with voltage transformer fault monitoring module to each voltage transformer respectively, and every voltage transformer fault monitoring module all includes voltage discrimination circuit, voltage normal discrimination circuit, no voltage discrimination circuit, voltage value low discrimination circuit, voltage difference high discrimination circuit, voltage transformer abnormal discrimination circuit and voltage transformer normal discrimination circuit, wherein:
the voltage judging circuit triggers a voltage action signal;
specifically, the voltage discriminating circuit comprises a first voltage comparator for comparing the fundamental component of the input bus voltage with a voltage setting value, a first AND logic device for performing AND logic processing on the output result of the first voltage comparator and the input signal of the soft pressing plate under voltage, and a second AND logic device for outputting a voltage action signal after a set time limit is passed on the output result of the first AND logic device.
The voltage-normal judging circuit triggers a voltage transformer normal signal according to the voltage action signal;
specifically, when the fundamental component of the input bus voltage is greater than or equal to a voltage setting value, a voltage action signal is output, and when the voltage normal judging circuit receives the voltage action signal, a voltage transformer normal sign is set, and a voltage transformer normal signal is output;
when the fundamental component of the input bus voltage is lower than the non-voltage setting value, the voltage once normal judges that the circuit instantaneous reset voltage transformer once normal marks.
The no-voltage judging circuit triggers a no-voltage action signal according to the normal signal of the voltage transformer;
Specifically, the no-voltage judging circuit comprises a second voltage comparator for comparing the input voltage fundamental component of the voltage transformer with a no-voltage setting value, an AND logic device II for performing AND logic processing on the output result of the second voltage comparator, the voltage transformer normal signal and the no-voltage no-operation signal, and the logic device II for outputting a no-voltage starting signal, and outputting the no-voltage operation signal after the set time limit of the no-voltage starting signal. The low voltage value judging circuit triggers a low voltage signal according to a normal signal of the voltage transformer;
The voltage value lower judging circuit comprises a first current comparator for comparing the absolute value of the difference value of the T line bus current and the F line bus current of the input main voltage transformer with the maximum value of the bus load current, a second current comparator for comparing the absolute value of the difference value of the T line bus current and the F line bus current of the input standby voltage transformer with the maximum value of the bus load current, a first logic device for performing OR logic processing on the output result of the first current comparator and the output result of the second current comparator, a soft pressing plate for triggering the soft pressing plate with the lower voltage value of the voltage value lower than the voltage value of the voltage of the input bus voltage and the minimum value of the bus voltage;
And a AND logic device III which performs AND logic processing on the input signal of the soft pressing plate with the lower voltage value, the normal signal of the voltage transformer, or the output result of the first logic device and the output result of the third voltage comparator, and outputs a voltage lower signal after the set time limit is passed on the output result of the AND logic device III.
The voltage difference high judging circuit triggers a voltage difference high signal according to a normal signal of the voltage transformer;
specifically, the voltage difference high judging circuit comprises a soft pressing plate with high voltage difference for triggering a soft pressing plate input signal with high voltage difference,
A voltage comparator IV for comparing the absolute value of the voltage difference obtained by calculating the difference between the input T-line bus voltage of the main voltage transformer and the T-line bus voltage of the standby voltage transformer with the set inherent error value;
a fifth voltage comparator for comparing the ratio obtained by dividing the input T-line bus voltage of the standby voltage transformer with the T-line bus voltage of the main voltage transformer with the set voltage comparison coefficient;
And a AND logic device IV for performing AND logic processing on the soft pressing plate input signal with the high voltage difference, the normal signal of the voltage transformer, the output result of the voltage comparator IV and the output result of the voltage comparator V, and outputting the high voltage difference signal after the set time limit is passed on the output result of the AND logic device IV.
The voltage transformer abnormality judging circuit triggers a voltage transformer abnormality signal according to the no-voltage action signal, the voltage lower signal and the voltage difference higher signal;
Specifically, the voltage transformer abnormality judging circuit comprises a second or logic device or a second logic device which performs OR logic operation on the non-voltage action signal, the voltage lower signal and the voltage difference higher signal, and outputs a voltage transformer abnormality signal.
The normal judging circuit of the voltage transformer triggers the normal signal of the voltage transformer according to the voltage action signal, the non-voltage action signal, the voltage lower signal and the voltage difference higher signal;
Specifically, the normal judging circuit of the voltage transformer comprises a first non-logic device for performing non-logic processing on a voltage lower signal, a second non-logic device for performing non-logic processing on a voltage lower signal, a third non-logic device for performing non-logic processing on a voltage difference higher signal, a fifth AND logic device for performing AND logic processing on the voltage lower signal, and the fifth AND logic device outputs a normal signal of the voltage transformer.
The automatic voltage switching device judges whether to switch the currently operated voltage transformer according to the abnormal signal or the normal signal of the voltage transformer output by each voltage transformer fault monitoring module.
The voltage automatic switching device comprises a T-line voltage mutual automatic switching hard pressing plate for triggering the T-line voltage mutual automatic switching hard pressing plate input signal and a T-line bus voltage automatic switching soft pressing plate for triggering the T-line bus voltage automatic switching soft pressing plate input signal;
If the main voltage transformer is currently operated, when receiving a T line voltage mutual automatic switching hard pressing plate input signal, a T line bus voltage automatic switching soft pressing plate input signal, a TF line bus separation non-positioning signal, a main voltage transformer abnormal signal and a standby voltage transformer normal signal, outputting a voltage switching signal, and automatically switching to the standby voltage transformer.
It can be understood that each section of bus of a railway traction substation (pavilion) 27.5kV is generally provided with 2 27.5kV voltage transformers, a main-standby redundancy mode is formed, and the purpose is that the voltage of a bus of the device can be switched to the operation of another voltage transformer when one voltage transformer fails. The voltage analog quantity of the 27.5k bus voltage transformer is important data for realizing measurement and control of the traction substation, and once interruption disappears or is abnormal, misoperation such as impedance protection of a feeder line system of the traction substation, low-voltage starting overcurrent protection of a high-voltage side and a low-voltage side of a main transformer system, a fault distance measuring device and the like are caused, power supply of contact network equipment is interrupted, and serious deviation of metering and measuring data is caused.
When the main and standby voltage transformers of the bus of the front railway traction substation are switched, the abnormality occurs, and the main low voltage is caused to start over-current protection misoperation, so that the traction power supply safety operation is seriously endangered.
For example, in actual operation, a high-voltage fuse is installed in most of 27.5kV voltage transformers, and most of the fuses are of a porcelain tube quartz sand plus fuse structure, after the fuse is broken, the break is small, high induced voltage still exists, and the voltage switching device cannot be automatically switched to standby voltage. Therefore, under the condition of the fuse fault, protection tripping can be caused, voltage data acquisition is abnormal, the range error is increased, and judgment and emergency treatment during the fault are affected.
The general substation is an AT power supply mode, and a 27.5kV bus is provided with 4 voltage transformers in total, wherein 1YH and 2YH are a group and are standby mutually, 3YH and 5YH are a group and are standby mutually, and 4YH and 6YH are a group and are standby mutually. Each voltage transformer further comprises a T line voltage transformer and an F line voltage transformer, and the total voltage transformer is eight voltage transformers. When the voltage transformer fails, the bus voltage of the device can be switched to the other normal voltage transformer to operate, so that the power supply reliability is improved. The 3YH, 4YH, 5YH and 6YH voltage transformers have an abnormality monitoring function and a transformer active fault detection function.
Taking a main voltage transformer UT1-1 as an example, the device of the application realizes the abnormality monitoring of the voltage transformer, and as shown in fig. 2, the device is a schematic diagram of the whole discrimination principle, and the monitoring methods of other voltage transformers are the same. Each module is described below:
1.1 judging whether there is pressure
The principle of the pressure discrimination is shown in figure 3. UT1-1 is the fundamental component of the bus voltage, uset is the voltage setting value, and Tset is the time limit setting value. When the fundamental component of the bus voltage is greater than or equal to the voltage setting value, the output UT1-1 has voltage, and the device is provided with voltage distinguishing elements for 8 paths of voltage respectively and independently, and shares a group of voltage setting values.
1.2, Voltage once normal sign
Taking UT1-1 as an example, when it is determined that UT1-1 is in voltage operation, a normal-time flag of UT1-1 voltage is set, and when the UT1-1 voltage value is lower than a non-voltage setting value, the normal-time flag of UT1-1 is reset instantaneously.
1.3, Pressureless discrimination
The non-pressure discrimination principle is shown in fig. 4. UT1-1 is the voltage fundamental component of the voltage transformer, uset is the non-voltage setting value, and Tset is the non-voltage time limit setting value. When the voltage fundamental component of the voltage transformer is not operated and is smaller than or equal to the non-voltage setting value, the non-voltage starting is output, the non-voltage operation is output after the non-voltage time limit, and the non-voltage distinguishing elements are respectively and independently configured for 8 paths of voltage to share a group of non-voltage setting values.
1.4, Low voltage value
The principle of judging the lower voltage value is shown in fig. 5, wherein um.min is the minimum value of bus voltage, im.min is the maximum value of bus load current, and when the voltage of UT1-1 is normal, UT1-1 is smaller than the minimum value of bus voltage, and the difference of TF line bus current of the main voltage transformer or the standby voltage transformer is smaller than the maximum value of bus load current, the voltage value of UT1-1 is output to be lower;
1.5, higher voltage difference
UT1-1 is taken as an example for illustration, and the other voltages are similar to each other. The principle of distinguishing the higher voltage difference is shown in fig. 6, K is a voltage comparison coefficient, and can be set to be 1.01 by default. When the UT1-1 voltage is normal, the bus voltage difference of the main voltage transformer and the standby voltage transformer is larger than the inherent error value of the measured values of the two voltage transformers, and the bus voltage ratio of the main voltage transformer and the standby voltage transformer is larger than the voltage comparison coefficient, the output UT1-1 voltage difference is higher. For better comparison of the voltages of UT1-1 and UT1-2, when UT1-2 is operating normally around rated voltage and the voltage of U1-1 is within the range of 95% to 105% of UT1-2, the tuning coefficient of UT1-1 can be calibrated based on UT1-2 to offset systematic errors, and the measured voltages are kept consistent when the two voltage transformers are operating normally.
1.6, Abnormality determination logic for Voltage Transformer
Taking UT1-1 as an example, the abnormality judgment logic of the voltage transformer is described, and the abnormality judgment logic of the other seven voltage transformers is similar. As shown in FIG. 7, the principle of judging the abnormality of the voltage transformer is that the main voltage transformer is abnormal when UT1-1 does not operate under the voltage condition, or UT1-1 operates under the voltage condition. If the voltage transformer is judged to be abnormal, a fault report is generated, and sampling data of the first two cycles of abnormality and the last 8 cycles of abnormality are sent up as fault waveforms.
1.7, Normal judgment logic of voltage transformer
Taking UT1-1 as an example, the normal judgment logic of the voltage transformer is described, and the abnormal judgment logic of the other seven voltage transformers is similar. The principle of normal judgment of the voltage transformer is shown in fig. 8, when the UT1-1 does not have voltage action, the UT1-1 voltage is lower, or the UT1-1 voltage difference is higher, but the UT1-1 voltage has voltage, the main voltage transformer for outputting UT1-1 is normal.
2. Voltage switching device
Three redundant voltage switching operations are arranged in the system, including automatic voltage switching, remote voltage switching and manual voltage switching, and each group of main and standby voltage transformers are provided with 3 modes for selection, namely manual switching, automatic switching and remote control switching. The remote control switching comprises active switching of a dispatching end, switching of a background machine operator and response switching. The response switching is a man-machine conversation function, when the operation voltage transformer monitors abnormality, the comprehensive automatic background machine pops out alarm information, and an operator on duty determines whether to switch voltage according to the situation. The automatic voltage switching function of the voltage transformer monitoring and switching device can be switched from the main voltage transformer to the standby voltage transformer, and also can be switched from the standby voltage transformer to the main voltage transformer, and the device can be switched after the voltage of the other (group of) voltage transformers is normal before switching.
As shown in FIG. 9, the voltage switching secondary schematic diagram is that the automatic switching of the busbar voltages of T1, T2, F1 and F2 is performed independently. Taking the T1 busbar as an example, the terminals (D1, D2) and (D3, D4) are two pairs of contacts of the same relay, the terminals (D1, D2) are normally closed contacts, and the terminals (D3, D4) are normally open contacts. In principle, the primary voltage is connected to terminals (D1, D2) and the secondary voltage is connected to terminals (D3, D4). The other bus voltage is connected in the same principle. Assuming that the initial state is UT1-1 active, UT1-2 standby, i.e., (D1, D2) closed, (D3, D4) open, the following three modes are described in turn:
2.1 automatic Voltage switching
Assuming that the initial state is UT1-1 active, UT1-2 is standby, namely (D1, D2) is closed, and (D3, D4) is opened, and the logic of the automatic voltage switching operation is shown in FIG. 10. In the figure, the "T1 pressure mutually automatic switching hard pressing plate" is the device hardware on-off. The automatic switching soft pressing plate of the T1 bus voltage is a user fixed value soft pressing plate. The voltage switching signal outlet drives the signal plug-in relay, the nodes of the terminals (D1 and D2) are opened, and the nodes of the terminals (D3 and D4) are closed.
The device automatically recognizes the switching action result, reports an event of 'voltage automatic switching success' after switching success, reports 'voltage automatic switching loop abnormality' if switching failure, reports 'voltage switching relay failure' simultaneously by self-checking, lights up a warning lamp, locks the automatic switching action of the bus voltage, and can recover the function only by resetting the device after removing the fault.
After one automatic switching power action, the next action can be started after 20s of automatic reset time, or the panel reset key is used for reset within 20 s.
2.2, Voltage remote control switching
Taking a T1 bus as an example, the opening condition of the voltage remote control switching function is that the hard pressing plate is switched on by the automatic switching of the T1 voltage, and the soft pressing plate is switched off by the automatic switching of the T1 bus voltage. The remote control should be configured in a single-position direct control mode.
2.3, Voltage Manual switching
When the remote control cannot be completed due to communication failure, the device supports manual switching. Taking a T1 bus as an example, the opening condition of the manual switching function is that the T1 pressure is automatically switched with the hard pressing plate and the hard pressing plate is withdrawn. Triggering a power supply to switch in B017, closing nodes of the terminals (D1 and D2), opening nodes of the terminals (D3 and D4), triggering the power supply to switch in B017, opening nodes of the terminals (D1 and D2), and closing nodes of the terminals (D3 and D4).
The device also provides a high-angle difference alarm of the bus voltage transformers, and when the voltage angle difference of 2 voltage transformers on the same bus is monitored to be larger than a threshold value phi, an alarm signal is sent out. Generating an event report and storing. Taking UT1-1 bus as an example for explanation, the mutual voltage angle difference criteria of other bus sections are similar. As shown in FIG. 11, the logic for judging the higher voltage angle difference is that the voltage angle difference of the voltage transformers on the same bus is higher when the voltage angle difference of the 2 voltage transformers on the same bus is larger than a threshold value phi and is larger than a setting value USY. In order to better compare the voltage angles of the UT1-1 and the UT1-2, when the UT1-1 and the UT1-2 normally operate near the rated voltage, the angle of the UT1-1 can be finely adjusted by taking the voltage angle of the UT1-2 as a reference so as to offset the system error, and the voltage angle difference is kept to be close to zero when the two voltage transformers normally operate.
The device also provides an active fault detection function of the transformer, and the fault detection can be carried out on 8 voltage transformer branches respectively by connecting a detection loop. The fault detection process of each loop is similar, and the fault detection process is described below by taking the loop in which UT1-1 is located as an example. After receiving a remote control detection command of a loop voltage transformer where the UT1-1 is located, the device records the voltage amplitude of the UT1-1, sends a detection switch-on switch-off command of the loop voltage transformer where the UT1-1 is located, records the voltage amplitude of the UT1-1 at the moment after a time delay t (which can be set and has a default value of 30 milliseconds), then withdraws the detection switch-on switch-off command of the loop of the voltage transformer, calculates the voltage difference before and after the loop is switched on, judges the voltage transformer to be faulty if the difference is greater than a setting value, generates a fault report, and sends sampling data of the first two cycles of remote control and the last 8 cycles of remote control as fault waveforms.
Example 2
The embodiment provides an intelligent monitoring and switching method for voltage of a traction substation, which is applied to the device in embodiment 1 and comprises the following steps:
s1, respectively acquiring bus voltage fundamental wave components of a currently operated voltage transformer and a standby voltage transformer, respectively monitoring operation states of the two voltage transformers, wherein the monitoring method comprises the following steps:
S11, outputting a voltage action signal and juxtaposing a voltage normal sign of a voltage transformer when the fundamental component of the bus voltage is larger than a voltage setting value, and resetting the voltage normal sign of the voltage transformer currently running instantaneously when the fundamental component of the bus voltage is lower than a non-voltage setting value;
s12, judging whether the voltage transformer does not act under voltage, whether the voltage value is lower or not and whether the voltage difference is higher or not according to the voltage normal sign of the voltage transformer;
S13, when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value and high voltage difference, the output voltage transformer is abnormal, and when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value, low voltage difference and high voltage action, the output voltage transformer is normal;
s2, if the running state of the currently running voltage transformer is abnormal and the running state of the standby voltage transformer is normal, the voltage automatic switching device switches the currently running voltage transformer to the standby voltage transformer.
It can be understood that the 27.5kV voltage intelligent monitoring device provided by the application does not need high-voltage side power failure and direct detection at the high-voltage side in order to ensure safe and stable operation of a traction power supply system, and the intelligent monitoring device does not have any influence on original equipment and circuits during operation. When the high-voltage fuse is not fused, the voltage data measured in real time can be visually displayed, and an alarm sound is sent out to prompt that the voltage at the moment belongs to normal operation voltage. After determining that the used voltage transformer fails or the high-low voltage fuse is fused, the standby voltage transformer is automatically put into, the 27.5kV voltage intelligent monitoring device is brought into the comprehensive automatic system, and switching information of the voltage transformer is transmitted to the dispatching terminal through the remote control system, so that the unmanned value requirement of the traction substation is met. The 27.5kV voltage intelligent monitoring switching device for the railway traction substation can be based on a PAC (programmable automatic controller) software and hardware platform, and a 'VLD' visual logic development tool is adopted in software development, so that the device has an offline logic simulation function and achieves 'transparency' of accident analysis.
The foregoing description of the preferred embodiment of the invention is not intended to limit the invention in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a traction substation voltage intelligent monitoring auto-change over device, a serial communication port, including the automatic switching device of voltage, traction substation every section generating line sets up main voltage transformer and reserve voltage transformer, be equipped with voltage transformer fault monitoring module to every voltage transformer respectively, every voltage transformer fault monitoring module all includes voltage discrimination circuit, voltage normal discrimination circuit, no voltage discrimination circuit, voltage value low discrimination circuit, voltage difference high discrimination circuit, voltage transformer abnormal discrimination circuit and voltage transformer normal discrimination circuit, wherein:
the voltage judging circuit triggers a voltage action signal;
The voltage-normal judging circuit triggers a voltage transformer normal signal according to the voltage action signal;
The no-voltage judging circuit triggers a no-voltage action signal according to the normal signal of the voltage transformer;
the low voltage value judging circuit triggers a low voltage signal according to a normal signal of the voltage transformer;
The voltage difference high judging circuit triggers a voltage difference high signal according to a normal signal of the voltage transformer;
the voltage transformer abnormality judging circuit triggers a voltage transformer abnormality signal according to the no-voltage action signal, the voltage lower signal and the voltage difference higher signal;
The normal judging circuit of the voltage transformer triggers the normal signal of the voltage transformer according to the voltage action signal, the non-voltage action signal, the voltage lower signal and the voltage difference higher signal;
the automatic voltage switching device judges whether to switch the currently operated voltage transformer according to the abnormal signal or the normal signal of the voltage transformer output by each voltage transformer fault monitoring module.
2. The intelligent monitoring and switching device for voltage of traction substation according to claim 1, wherein the voltage discriminating circuit comprises a first voltage comparator for comparing the fundamental component of the input bus voltage with a voltage setting value, a first AND logic device for performing AND logic processing on the output result of the first voltage comparator and the input signal of the soft pressing plate under voltage, and a second AND logic device for outputting a voltage action signal after a set time limit is passed.
3. The intelligent monitoring and switching device for voltage of traction substation according to claim 2, wherein when the fundamental component of the input bus voltage is greater than or equal to a voltage setting value, a voltage action signal is output, and when the voltage normal judging circuit receives the voltage action signal, a voltage transformer normal sign is set, and a voltage transformer normal signal is output;
when the fundamental component of the input bus voltage is lower than the non-voltage setting value, the voltage once normal judges that the circuit instantaneous reset voltage transformer once normal marks.
4. The intelligent monitoring and switching device for voltage of traction substation according to claim 1, wherein the no-voltage judging circuit comprises a second voltage comparator for comparing the fundamental voltage component of the input voltage transformer with a no-voltage setting value, a second AND logic device for performing AND logic processing on the output result of the second voltage comparator, the voltage transformer normal signal and the no-voltage non-operation signal, and the second logic device for outputting a no-voltage starting signal, and the no-voltage starting signal is output after a set time limit.
5. The intelligent monitoring and switching device for the traction substation voltage according to claim 1, wherein the low voltage value judging circuit comprises a first current comparator for comparing the absolute value of the difference value of the T-line bus current and the F-line bus current of the input main voltage transformer with the maximum value of the bus load current, and a second current comparator for comparing the absolute value of the difference value of the T-line bus current and the F-line bus current of the input standby voltage transformer with the maximum value of the bus load current, and an output result of the first current comparator and an output result of the second current comparator are processed logically or are processed logically;
The voltage comparator III is used for triggering the soft pressing plate with a lower voltage value and a lower voltage value of the soft pressing plate input signal and comparing the input bus voltage value with the minimum bus voltage value;
And a AND logic device III which performs AND logic processing on the input signal of the soft pressing plate with the lower voltage value, the normal signal of the voltage transformer, or the output result of the first logic device and the output result of the third voltage comparator, and outputs a voltage lower signal after the set time limit is passed on the output result of the AND logic device III.
6. The intelligent monitoring and switching device for voltage of a traction substation according to claim 1, wherein the voltage difference high judging circuit comprises a voltage difference high soft pressing plate for triggering a voltage difference high soft pressing plate input signal;
a voltage comparator IV for comparing the absolute value of the voltage difference obtained by calculating the difference between the input T-line bus voltage of the main voltage transformer and the T-line bus voltage of the standby voltage transformer with the set inherent error value;
a fifth voltage comparator for comparing the ratio obtained by dividing the input T-line bus voltage of the standby voltage transformer with the T-line bus voltage of the main voltage transformer with the set voltage comparison coefficient;
And a AND logic device IV for performing AND logic processing on the soft pressing plate input signal with the high voltage difference, the normal signal of the voltage transformer, the output result of the voltage comparator IV and the output result of the voltage comparator V, and outputting the high voltage difference signal after the set time limit is passed on the output result of the AND logic device IV.
7. The intelligent monitoring and switching device for voltage of a traction substation according to claim 1, wherein the voltage transformer abnormality judging circuit comprises a logic device II or a logic device II which performs OR logic operation on a non-voltage action signal, a voltage lower signal and a voltage difference higher signal, and outputs a voltage transformer abnormality signal.
8. The intelligent monitoring and switching device for traction substation voltage according to claim 1, wherein the normal judging circuit of the voltage transformer comprises a non-logic device I which performs non-logic processing on the voltage lower signal,
The non-logic device II performs non-logic processing on the non-voltage action signal, the non-logic device III performs non-logic processing on the signal with higher voltage difference, the AND logic device five performs AND logic processing on the non-logic device I output, the non-logic device II output, the non-logic device III output and the voltage action signal, and the AND logic device five outputs a normal signal of the voltage transformer.
9. The intelligent monitoring and switching device for voltage of traction substation according to claim 4, wherein the automatic voltage switching device comprises a T-line voltage mutual automatic switching hard pressing plate for triggering the T-line voltage mutual automatic switching hard pressing plate input signal and a T-line bus voltage automatic switching soft pressing plate for triggering the T-line bus voltage automatic switching soft pressing plate input signal;
If the main voltage transformer is currently operated, when receiving a T line voltage mutual automatic switching hard pressing plate input signal, a T line bus voltage automatic switching soft pressing plate input signal, a TF line bus separation non-positioning signal, a main voltage transformer abnormal signal and a standby voltage transformer normal signal, outputting a voltage switching signal, and automatically switching to the standby voltage transformer.
10. The intelligent monitoring and switching method for the traction substation voltage is characterized by comprising the following steps of:
s1, respectively acquiring bus voltage fundamental wave components of a currently operated voltage transformer and a standby voltage transformer, respectively monitoring operation states of the two voltage transformers, wherein the monitoring method comprises the following steps:
S11, outputting a voltage action signal and juxtaposing a voltage normal sign of a voltage transformer when the fundamental component of the bus voltage is larger than a voltage setting value, and resetting the voltage normal sign of the voltage transformer currently running instantaneously when the fundamental component of the bus voltage is lower than a non-voltage setting value;
s12, judging whether the voltage transformer does not act under voltage, whether the voltage value is lower or not and whether the voltage difference is higher or not according to the voltage normal sign of the voltage transformer;
S13, when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value and high voltage difference, the output voltage transformer is abnormal, and when the voltage transformer simultaneously meets the conditions of no-voltage action, low voltage value, low voltage difference and high voltage action, the output voltage transformer is normal;
s2, if the running state of the currently running voltage transformer is abnormal and the running state of the standby voltage transformer is normal, the voltage automatic switching device switches the currently running voltage transformer to the standby voltage transformer.
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| EP3699606A1 (en) * | 2019-02-22 | 2020-08-26 | ABB Schweiz AG | A protection circuit for a medium voltage or high voltage transformer |
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| CN109283437A (en) * | 2018-11-06 | 2019-01-29 | 国网四川省电力公司技能培训中心 | PT disconnection and single-phase ground fault simulation device and method |
| CN120722254A (en) * | 2025-07-16 | 2025-09-30 | 成都交大许继电气有限责任公司 | A method, system and device for monitoring voltage mutual fuses in a traction power supply system |
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| CN104297625A (en) * | 2014-11-07 | 2015-01-21 | 安徽马钢自动化信息技术有限公司 | PT wire breakage diagnosis system and method |
| EP3699606A1 (en) * | 2019-02-22 | 2020-08-26 | ABB Schweiz AG | A protection circuit for a medium voltage or high voltage transformer |
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