JPH04334831A - Operating time measuring device of switchgear for electric power - Google Patents

Abstract

PURPOSE:To decide whether a detected operation instruction signal is a correct signal or a wrong signal owing to a surge current and the like by collating the operation instruction with the condition of the contact of an auxiliary switchgear, when the operation instruction signal of a switchgear is detected. CONSTITUTION:The outputs of the operation instruction current detecting sensors 51c and 51o at the input side and the tripping side installed to the control line of the control circuit of a switchgear, and the outputs of the position detecting sensors 54c and 54o at the input side and the tripping side of movable parts of the switchgear are transmitted to a time measuring circuit 56. The outputs of the auxiliary switchgear contacts 59c and 59o at the input side and the tripping side of the switchgear are also transmitted to the time measuring circuit 56. When the startup of the control current of the switchgear is detected by an operation instruction current sensor 51, the detecting signal and the outputs from the auxiliary switchgear contacts 59 are collated.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Industrial Field of Application] The present invention is a gas-insulated power switchgear in which power equipment is compactly housed in a grounded metal container filled with insulating gas, and is a preventive device suitable for confirming and monitoring the reliability of the housed equipment. The present invention relates to an operating time measuring device for power switching equipment that functions as a maintenance system.

0003

[Prior Art] In recent years, due to the need to strengthen substation equipment due to the soaring cost of land and the increase in power supply in urban areas, SF6 gas, which has excellent insulating and arc-extinguishing properties, has been used to create disconnectors and circuit breakers. Gas-insulated switchgear, in which substation equipment such as equipment is housed in a sealed, grounded metal container, is environmentally resistant and has a compact installation volume per KVA, and has become popular, replacing conventional air-insulated switchgear. It is in operation.

Although the gas-insulated switchgear as described above has various advantages such as being compact and reducing the number of exposed live parts in the grounded metal container, it also has the disadvantage of difficulty in maintenance diagnosis and increased maintenance and repair work time due to higher performance. If an abnormality occurs inside the container, the reliability of the container is significantly reduced.

[0005] Therefore, in order to improve the overall reliability of gas-insulated switchgear, appropriate design and
However, as part of improving the quality of power supply capacity, it is necessary to check and monitor the reliability of the entire device, and various effective means have been studied. One of the most important items of such monitoring means is monitoring the operating time of switching equipment.

[0006] In other words, since switching equipment has movable parts and these move at considerably high speeds, there is a higher probability of malfunctions than with stationary equipment such as busbars and transformers. Circuit breakers, etc. are the main components of substations.
These defects are highly likely to seriously impede the stable operation of the substation. Therefore, it is necessary to establish a preventive maintenance system that can measure the operating time of each switching device and take immediate countermeasures when an abnormality in the measured value is detected.

FIG. 3 shows an example of a method for measuring the operating time of such a switching device. In FIG. 3, 41
is the operation command current waveform flowing in the control line of the control circuit of the switching equipment, 42 is the output waveform of the operation command current detection sensor receiver,
43 is a stroke curve of a movable part of the opening/closing device. In addition, 44 and 45 in the figure are the output waveforms of the position detection sensors on the "closing" side and "removal" side of the movable part of the switching equipment, which are attached to the drive part of the switching equipment, and they are respectively at each end of the stroke curve. It is turned on and off at the corresponding location.

[0008] For example, there is a configuration of a time measurement circuit used in such an operation time measurement method as shown in FIG. In FIG. 4, 51c and 51o are operation command current detection sensors on the "closing" side and "tripping" side that are attached to the control lines of the control circuit of the switching equipment, and their outputs are sent to the receiver via the cable 52. 53. 54c, 54
o is the "
These are position detection sensors for the "putting" side and the "pulling" side, and conventionally microswitches, proximity sensors, etc. have been used. Output signals from these position detection sensors 54c and 54o are transmitted to a receiver 55 via a cable 52.

Reference numeral 56 denotes a time measurement circuit, which starts time measurement at the falling edge of the operation command current detection waveform 42 as shown in FIG. The ON and OFF states of the output are sampled and all of them are temporarily stored in the memory 58. After the measurement is completed, the time from the ON/OFF state of the operation command and the output of the operation position detection sensor to the start of operation from the fall of the operation command signal (T1 in FIG.
) and the opening/closing operation time from the start of operation to the end of operation (
T2) in FIG. 3 are calculated and transmitted to a processing device 57 that performs storage display output, etc.

[0010] In such an operation time measuring circuit, not only the individual operations such as the "closing" operation and the "tripping" operation of the switching device, but also the operation command and the output signal of the operation position detection sensor are stored in the memory. Therefore, continuous operation of the breaker
It is also possible to accurately determine and measure operations such as "trip-off-time-wait-put-in-trip".

By the way, as an operation command detection method applied to the opening/closing time measuring circuit as shown in FIG. 4, the following method is proposed in Japanese Patent Application No. 62-062501. That is, FIG. 5 shows a control signal detection circuit for this conventional circuit breaker. This closing circuit includes a closing command input terminal 1, a changeover switch 2, an impedance 3, and a closing coil 4a provided in parallel with the impedance 3. The current flowing through this closing coil 4a is
It is detected by the feed-through current transformer (control current detection means) 5a on the closing side.

A control line 6a is provided in this through-type current transformer 5a.
has penetrated more than once. The output signal of the feed-through current transformer 5a on the input side is input to a pulse shaping circuit (signal waveform shaping means) 8a via an impedance 7a. Here, the pulse shaping circuit 8a is a receiver that captures the rise of the current I of the input signal and outputs a square waveform at a timing that matches the rise. configured.

On the other hand, the tripping circuit is composed of a tripping command input terminal 9, an impedance 10, and a tripping coil 4b provided in series with the impedance 10. The current flowing through the tripping coil 4b is detected by a through-type current transformer (control current detection means) 5b on the tripping side. A control line 6b passes through the through-type current transformer 5b at least once. Through-type current transformer 5b on the tripping side
The output signal is input to a pulse shaping circuit (signal waveform shaping means) 8b via an impedance 7b, and a square waveform is outputted at a timing matching the rise of the current I, similar to the input side.

In the control signal detection device for power switchgear configured as described above, first, in the case of a closing operation, when a control current flows through the control circuit in response to a closing command, this current flows through the through-type current transformer on the closing side. Detected at 5a. As a result,
The output signal of the feed-through current transformer 5a on the input side is input to a pulse shaping circuit 8a, which outputs a detector output pulse. The time delay from the rise of the control current to the output of the detector output pulse is normally set to within 1 ms, and each position detection sensor measures the time until the output pulse based on the detector output pulse. By doing so, the operation of the equipment can be monitored.

[0015]

[Problems to be Solved by the Invention] However, the above-mentioned conventional techniques have the following drawbacks. That is,
During equipment operation, the operation of relays included in the control circuit,
Surge currents may be generated in the control line due to wraparound in the control circuit including the control cable, and it is conceivable that the operating time measuring device malfunctions due to these surge currents. An example of a malfunction caused by such a surge current is shown in FIG.

In FIG. 6, after the circuit breaker closing operation, a surge current 62 is induced in the circuit breaker tripping side control circuit when the auxiliary switch B contact turns OFF, and this surge current causes the tripping side operation command current detection sensor works. The processing device 57 calculates the time from the fall of the trip side command detector output 64 to the start of operation (T3 in FIG. 6) and the time at which the operation starts (fall of the trip side position detection sensor output waveform in FIG. 6). An attempt is made to calculate the opening/closing operation time (T4 in Figure 6) from the time to the end of the operation, but since there is no change in the output 66 of the input side position detection sensor, the measurement of T4 is aborted at the measurement time set in the program. , the measurement result will be that the circuit breaker is not tripped.

The present invention was proposed in order to solve the problems of the prior art as described above, and it is possible to accurately control the operating time of switching equipment without causing malfunctions due to surge currents induced in control lines, etc. An object of the present invention is to provide an operating time measuring device for power switching equipment that can measure the operating time of power switching equipment.

[Configuration of the invention]

[0019]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an operation command current detection means attached to a control circuit for turning on/off a power switching device, and a switching device attached to the switching device. In an operating time measuring device for electric power switching equipment, the device includes a position detecting means for a moving part of a power switch and a measuring means for measuring the operating time of the switching equipment from the output signals of these detecting means. The switch contact is connected, and the detection signal of the operation command current detection means is compared with the output from the auxiliary switch contact to determine whether or not the operation command current detection signal is appropriate.

[0020]

[Operation] In the operating time measuring device for power switchgear of the present invention having such a configuration, when the operation command current detection means detects the rise of the control current of the switch,
This detection signal is compared with the output from the auxiliary switch contact, and when the operating current detection means detects a closing operation command, the switching device is in the closing state, and when the operating current detection means detects a tripping operation command. When the opening/closing device is in a tripped state, it is determined that detection of the operation command current is inappropriate, and the operation time is not measured, thereby preventing malfunction of the operation time measuring device.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the operating time measuring device of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram of an operating time measuring device for power switching equipment to which the present invention is applied, and FIG. 2 is a time chart showing the operating time measuring method thereof.

In FIG. 1, 51c and 51o are operation command current detection sensors (corresponding to the operating current detection means of the present invention) on the "closing" side and "tripping" side attached to the control line of the control circuit of the switching equipment. ), and its output is cable 5
2 to the receiver 53. Reference numerals 54c and 54o are position detection sensors (corresponding to the position detection means of the present invention) on the "input side" and "removal side" of the movable part of the switching equipment attached to the switching equipment drive part, and are not limited to microswitches or proximity sensors. etc. are used. These position detection sensors 5
The output signal of 4 is transmitted to a receiver 55 via cable 52.

Reference numerals 59c and 59o are auxiliary switch contacts on the "closing" side and "tripping" side of the switching device, and the output thereof is sent via the cable 52 to the auxiliary relay 60c on the "closing" side and "tripping" side. , 60o. 56 is a time measuring circuit (corresponding to the measuring means of the present invention), which measures the operating time of the switching device from the outputs of the receivers 53, 55 and auxiliary relays 60c, 60o, stores it in the memory 58, and further displays the output. The information is transmitted to a processing device 57 that performs the following operations.

The operation of the operating time measuring device of this embodiment having such a configuration is as follows. For example, when the operation command current detection sensor 51c on the “closing” side detects a rising edge (closing command) of the operation command current detection waveform 63 shown in FIG. The signal is then sent to the time measurement circuit 56. At the same time, the outputs 68, 69 of the auxiliary switch contacts 59c, 59o on the "closing" side and "tripping" side are connected to the auxiliary relay 60c,
It is input to the time measurement circuit 56 via 60o.

In this time measuring circuit 56, the outputs 68 and 69 of the auxiliary switch contacts 59c and 59o indicate that the switching device is
Determine whether it is in the "closed" state or the "unloaded" state. At this time,
When the opening/closing device is in the "tripped" state, the output signal from the operation command current detection sensor 51c is correct, so the time measurement circuit 56 starts measuring time. Then, the output 61 of the operation command current detection sensor 51c and the position detection sensor 54c is outputted at a predetermined time interval at a predetermined time interval.
66 ON and OFF states are sampled and all of them are temporarily stored in the memory 58. Then, after the measurement is completed,
The time from the ON/OFF state of the outputs 61 and 66 of the operation command and operation position detection sensors 51c and 54c to the fall of the operation command signal and the start of operation (T1 in FIG. 2)
and the opening/closing operation time (T2 in FIG. 2) from the start of the operation to the end of the operation are calculated and transmitted to the processing device 57 that performs storage display output, etc.

On the other hand, when the output signal 61 from the operation command current detection sensor 51c is detected, the auxiliary switch contact 5
If it is determined from the outputs 68 and 69 of the switches 9c and 59o that the switching device is in the "tripped" state, the output signal 61 from the operation command current detection sensor 51c is erroneous due to a surge current or the like. Therefore, in such a case, the time measurement circuit 56 does not perform time measurement as described above.
Data is not stored in the memory 58 or output to the processing device 57.

Similarly, when the operation command current detection sensor 51o on the "trip" side detects the trip command 62,
In the time detection circuit 56, the auxiliary switch contacts 59c,
It is determined whether the switching device is in the "closing" state or the "tripping" state from the outputs 68 and 69 of The time T3 from the fall of the operation command signal during the removal operation to the start of the operation and the opening/closing operation time T4 from the start of the operation to the end of the operation are measured, respectively.

On the other hand, from the outputs 68 and 69 of the auxiliary switch contacts 59c and 59o, when the switching equipment is in the "tripped" state, the output signal 62 from the operation command current detection sensor 51o is caused by an erroneous surge current or the like. It is something. Therefore, in such a case, the time measurement circuit 56 does not measure time as described above.

As described above, in this embodiment, when the switching device is in the closing state when the closing command is detected, and when the switching device is in the tripping state when the tripping command is detected, the time Since it is configured not to perform measurements,
Erroneous measurement of operating time due to erroneous detection of command signals caused by surges or the like is prevented.

[0030]

[Effects of the Invention] In the present invention, when an operation command signal of a switching device is detected, this operation command is compared with the state of the auxiliary switch contact to check whether the detected operation command signal is correct or whether the surge current is detected. To provide an excellent operating time measuring device that accurately measures the operating time of switching equipment without malfunctioning due to surge current induced in a control line, etc. be able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an operating time measuring device for power switching equipment according to the present invention.

FIG. 2 is a time chart showing the operation of the operation time measuring device of FIG. 1;

FIG. 3 is a time chart showing a general method for measuring operating time of opening/closing equipment.

FIG. 4 is a block diagram showing an example of a conventional operating time measuring device for power switching equipment.

FIG. 5 is a circuit diagram showing an example of a control signal detection circuit for a circuit breaker.

FIG. 6 is a time chart showing malfunctions of the switching equipment operating time measuring device due to surge current in the operating time measuring device of FIG. 4;

[Explanation of symbols]

51c, 51o...Operation command current detection sensor 53...Receiver 54c, 54o...Position detection sensor 55...Receiver 56...Time measurement circuit 57...processing device 58...Memory 59c, 59o...Auxiliary switch contact 60c, 60o...Auxiliary relay

Claims (1)

[Claims] [Claim 1] An operation command current detection means attached to a control circuit for turning on and off a power switching device, a position detection means of a switch movable part attached to the switching device, and an output signal from these detection means. In an operating time measuring device for electric power switching equipment, which is equipped with a measuring means for measuring the operating time of the switching equipment, an auxiliary switch contact of the switching equipment is connected to the measurement output means, and a detection signal of the operation command current detection means is connected to the measurement output means. An operating time measuring device for electric power switching equipment, characterized in that it compares the output from an auxiliary switch contact to determine the suitability of an operating command current detection signal.