JPS5854817A - Protection relay setting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a setting device for a protective relay, particularly for a caftum L.
The present invention relates to a protective IJ relay setting device that facilitates setting values of analog type relays that are integrated.

Conventional electromagnetic relays and transistor relays rely on spring tension, electrical circuit constants,
We have used the transformer turns ratio (magnetic circuit constant), etc.

However, digital protection relays using microcomputers, which have recently been put into practical use, use system information input through a common input transformer to perform fault determination, which is equivalent to the conventional multiple protection relay elements. Therefore, there is a limit to changing the setting depending on the turns ratio of the input quadrance.

In other words, digital protection relays require a different expression method and setting format than the setting method for conventional protection relays, and the setting value setting method requires a common setting value setting section for all protection relays. A common settling method is being adopted.

The common setting method is not the conventional method using taps (transformer turns ratio, etc.), but the units of numerical values are A (ampere), ■ (pol F), Ω (
Absolute value expressions such as ohms) are being adopted.

On the other hand, as power system configurations become more sophisticated and double-tracked,
Protection relay devices are also required to have higher performance, smaller size, lower cost, and higher reliability. In order to meet such demands, not only digital relays using microcomputers as described above are being developed, but also custom ICs for conventional analog relays are being developed.

The mainstream of future protection relay systems will be analog relays made from conventional discrete components that are converted into custom ICs, or combinations of such custom IC analog relays and digital relays using microcomputers. considered to be a thing.

When such a system is considered, the first problem arises.

This is the relay setting method. In other words, if the setting method of a custom IC-based analog relay were to use the conventional p tap method, it would not be consistent with the decimal and absolute value expressions of digital relays. This may cause incorrect settings.

Furthermore, in consideration of miniaturization, signal power of internal wiring, load on transformers, cost, etc., a method of integrating input transformers is desirable, and is actually being adopted. In such a lumping system, there are limits to the tap system depending on the turns ratio of the transformer, etc., and a new analog type relay setting system is required.

The object of the present invention is particularly to
Common settings that can be set using the same setting method not only when using a single C-based analog relay, but also when using a mixed relay system that includes the custom IC-based analog relay and a digital relay using a microcomputer. Method (Common setting method for decimal number and absolute value expression)
It is to propose.

The gist of the present invention is that it includes a relay selection switch and a setting value setting switch expressed in decimal and absolute values, which are common to digital type relays, and it is also possible to set integer values for analog type relays in decimal and absolute value expression. The point is that this setting value is stored in memory, this value is further converted to a switch drive code, and the attenuator (for setting) switch is controlled by this output to perform setting (voltage division). be.

In addition, in the present invention, the value converted to the switch drive code is
The value was again converted back to a decimal/absolute value representation, and this was displayed so that the set value could be confirmed.

Further, the setting device of the present invention is configured so that it can be implemented using switches, indicators, etc. common to both analog type relays and digital type relays.

Further, the setting device of the present invention is characterized in that it enables online setting changes, which was impossible with conventional analog relays.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

First, the overall configuration of the present invention will be explained using diagram M1. In the figure, IA to IN are signal lines that input system information (the output of the shared auxiliary transformer), 1 is an analog filter that removes harmonic components generated in the system, and 2 is a phase shift circuit (common to each relay element). (only basic phase shift).

Further, 3A to 3N are analog type relays made into custom ICs (one chip). Reference numeral 4 denotes an analog-to-digital conversion circuit, 5 a microcomputer to be described later, and 6 a common setting section to be described in detail later.

That is, FIG. 1 is an example of the case where the present invention is applied to a mixed system of a custom IC analog type relay and a digital type relay having a common input section.

In addition, in FIG. 1, the parts other than the common setting section 6 are the same as a conventional relay system consisting of a combination of an analog type relay and a digital type relay.

However, in conventional relay systems, the setting of some of the analog relays and the setting of some of the digital relays was accomplished by separate analog and digital setting means (not shown). 1. FIG. 2 is a block diagram showing the configuration of the known digital type 9-ray (portion of A7/D conversion circuit 4 and microcomputer 5) shown in FIG.

In the figure, 41A to 41N are sample and hold elements, 4
2 is a multiplexer, 43 is a converter, and 44 is a buffer memory circuit.

51 is an arithmetic processing unit (CPU) which is the central part of a microcomputer, and 52 is a program storage unit (R) that stores programs for protection relays and sequence processing.
OM: read-only memory unit).

53 is a data storage unit (RAM: random access memory unit) that temporarily stores input data and data in the middle of calculation, etc.; 54 is a memory unit that issues control commands to external equipment based on the calculation results; information or the above 3
I shows the data input/output circuit (engineering part 10) that inputs the output etc. of the custom IC analog eight relays of A to 3N.

[Digital type protection relay] In such a configuration, a calculation for detecting an accident at each sampling is performed on the input data of each sampling according to a well-known protection relay program stored in the memory. be.

For example, in the case of a known reactance relay, this calculation is performed according to equation (1) (I Z-V )・I
Z ・・・・・・・・・・・・(1) Of course, after performing this calculation, it goes without saying that an integration process is performed over a predetermined interval to convert it to a DC level, and the obtained value is compared with a predetermined value ΔV.

In addition, in the case of a known morley relay, (IZ
-V) φ■ . . . (2) Executes the calculation and performs the same processing as above.

In addition, in the above equations (1) and (2), i represents current, Z represents settling impedance, and ■ represents voltage, respectively.

Next, the block configuration of the analog relay will be described.

FIG. 3 shows an example of a block configuration of a direct phase comparison type distance relay. In the figure, 10 and 11 are phase shift (vector synthesis) circuits, 12 is a settling section, 13 is a vector synthesis (addition) circuit, 14 and 15 are square wave conversion circuits, 16 is a comparison circuit,
Reference numeral 17 indicates a determination logic circuit.

For example, if the block configuration of FIG. 3 is applied to a known Morley relay whose vector diagram is shown in FIG. 4, the outputs of each part will be as follows. As is well known, in FIG. 4, the inside of the circle C is the operating range, and the outside of the circle C is the non-working range.

That is, when a current ■ is supplied to the input of the phase shift circuit 10 in FIG. 4, and a voltage V is supplied to the input of the other phase shift circuit 11, the output of the phase shift circuit 10 is phase shifted by I (leads by θ with respect to I). The output of the circuit 11 becomes V. Further, the output 12A of the setting section 12 is IZ
, 12B is ■ and null.

Therefore, the outputs 13A of the vector and signal synthesis circuits 13 are converted into square waves by the square wave conversion circuits 14 and 15, respectively.
A comparison circuit 16 compares it with a certain voltage. moreover,
The judgment logic circuit 17 determines that the overlapping angle between these two is 9.
Similarly, if a known reactance relay whose vector diagram is shown in FIG. 5 is given the block configuration shown in FIG. 3, the output 13A will be -÷) and the output 13B to IZ, respectively, and by performing the same processing as in the case of the Mori relay, the reactance characteristics shown in FIG. 5 can be realized.

Figure 6 shows the custom IC analog relay 3 in Figure 1.
An example of a block configuration is shown in which A to 3N are rectified analog relays.

In the figure, 20 is a setting circuit, 21 is a phase shift (phase increase) circuit, 22 is a rectifier circuit, 23 is a smoothing circuit, and 24 is a determination circuit. This block configuration is applicable to early-on power relays, overcurrent relays, undervoltage relays, and the like.

Above, an overview of digital relays and an overview of the configuration of analog relays have been described, taking into account the mixed system of custom IC-based analog relays and de-13-internal relays.

Next, a common setting method for these analog type relays and digital type relays will be described using FIG. FIG. 7 is a block diagram showing an example of a settling section according to the present invention.

First, we will discuss the setting method for analog relays. In the figure, 70 indicates a relay selection switch that selects a large number of relay elements. 71 is a selection relay address encoder.

72-1 to 72-n are electrically erasable and writable nonvolatile memories IJ (EAROM) for storing set values;
3-1 to 73-n are latch circuits, and 74-1 to 74-n are switch drive code converters (for example, non-volatile memory IJ: ROMI), 75-1~
75-n is a switch, and 76-1 to 76-n are voltage attenuators to be described later.

Further, 77 is a switch drive code converter (e.g., non-volatile memory: ROM2) that converts the switch drive code into a set value expressed in 14-decimal number and absolute value;
8 is a data selector, 79 is a driver circuit, 80 is a set value display, and 81 is the above-mentioned non-volatile memo! J72-1~
This is a setting value setting switch for setting a setting value to 72-n.

82-1 to 82-n are launch signal control gates 90-1 to 90 that latch the outputs of the memories 72-1 to 72-n;
-n is a write signal control gate for writing data into the cough memories 72-1 to 72-n, and 83 is a control switch such as a setting change control switch (signal A) and a data write switch (signal B).

The parts described above are the configurations related to the setting section of the analog relay.

Next, we will discuss the blocks necessary for setting the digital relay.

In the figure, 84 is an address selection switch (selector)
, 85 is an electrically erasable and rewritable nonvolatile memory (EAROM) for storing set values similar to those of the memories 72-1 to 72-n, 86 is an optical display control (latte) circuit, and 87 is an address matching circuit. In the circuit, 88-1 is a data latch control gate, 88-2 is a gate for controlling data writing to the EAROM 85, and 89 is a data latch (
91 is a digital data bus.

The blocks 84 to 89 described above are blocks related to the setting section of the digital relay.

Below, referring to the drawings, a detailed description will be given of the operation when setting the setting value of an analog type relay in an embodiment of the present invention.

■First, when attempting to change the setting of the protection relay, press the setting change switch 83. This causes the output signal A to become a rubel.

(2) Select the relay element whose setting is to be changed using the relay selection switch 70. In this way, the value selected by this switch 70 is encoded by the address encoder 71, and the value selected by the switch 70 is encoded by the address encoder 71.
2-n, the selected one - i.e. 72-1
is specified (in other words, an address is specified).

Next, the setting value (constant) to be set in that relay is set using the setting value setting switch 81. This setting value is not the conventional % setting, but for example, 10A (
It is set in decimal absolute value expression, such as ampere), 10v (volt), and 10Ω (ohm).

■Twitch and press the setting value write switch 83. This causes the output signal B to become a rubel.

(2) The set value set by the set value setting switch 81Vc is stored in the nonvolatile memory (EAROM) 72-1. Here, the use of a non-volatile memory (electrically rewritable) for storing the set value is a measure against power outages, and is not essential to the present invention.

■Memo The setting value (decimal, absolute value expression) stored in IJ72-1 is the switch drive code converter (ROMI)
74-1, it is converted into a switch drive code as described below. The operation of the ratchet circuit 73-1 will be described later.

(2) The switch drive code obtained by the switch drive code converter 74-1 is applied to the switch group 75-S, and the voltage division ratio of the voltage attenuator 76-1 is set to a value corresponding to the input setting value.

FIG. 8 shows a switch group 75-1 and an attenuator (setting section) 76.
An example of the configuration of -1 is shown below. In the same ward, r11r2...
rlO are all equal and are chosen as r.

FIG. 89 shows an example of the ROM 1, that is, the memory 74, which converts a set value (eg, 8.6 V) into a switch drive code. Referring to FIG. 9, an example of the relationship between set setting values, switch drive codes, and setting (voltage conversion-attenuation) will be described.

For example, assume that the setting value setting switch 81 in FIG. 7 is set to 8.6V. At this time, 10000110 (=86) is stored in the EAROM, that is, the memo 1J72-1, in binary coded decimal notation as shown at the left end of FIG. This value is the switch code converter 74-1
K is input.

The kanji converter 74-1 is a kind of conversion table 18-, in which case the input (in the present example, 10000110 in binary coded decimal notation, i.e. 86 in decimal notation)
is used as addressing data.

In this example, the switch code converter 74-1 assigns 1 to each address corresponding to the input to each switch 81 to S in FIG.
It stores the output data of 9 pits.

The above-mentioned value is rl""'rl when the input voltage is assumed to be 10V at full scale in FIG.

Each switch is controlled to open and close so that the voltage is divided by , and 8.6 V is obtained as the output IZ.

That is, in FIG. 8, N rl-rl=...
Since it is assumed that -rto""r, the output voltage i is (3).

(4) Expression is used.

=10VX0.8+10V-0.6X0.1=8.6V
-== (4) Actually, as is clear from Fig. 8, the input I
-IZ and the sign are reversed.

■Therefore, the switch that is turned on by the operation in ■ above is:
Of the switch group 75-1 in FIG. 8, only 830 and 84 are included. , (when setting 8.6 V).

0th order, the switch drive code inverter 77, quite the opposite of the switch drive code converter 74, converts the output of the switch drive code converter 74 into a decimal format in the same format as the output of the switch drive code converter 74,
Convert back to absolute value representation.

[Phase] The inversely converted set value is given to the lamp driver 79 via the data selector 78, and this value is displayed on the display lamp 80.

■The operator uses the value he or she has set and this display lamp 80.
By comparing with the value displayed in , it is possible to reliably check the set value.

Next, a case will be described in which setting changes are made online without locking the relay output.

In this case, the latch circuits 73-1 to 73-n and the launch control gate 82-1-8 indicated by broken lines in FIG.
2-n is added, and a signal line a for transmitting the data of the EAROM 72-1 to the data selector 78 is provided. Then, by operating the setting change control switch 83, the output signal A is set to level (A=0 level).

This locks the latch timing of the latch circuit 73-1 and prevents the output of the memory 72-1 (ie, the new set value) from being latched by the launch circuit 73-1. In other words, the set value that has been latched is held as is.

In this way, perform the EA using the same method as above.
Store the new setting value in ROM 72-i. and sends this value to the data selector 78 via the signal line a, further displays it on the set value display 80 via the driver 79,
Make sure to check it.

After confirming that the correct new setting value has been stored in the EAROM 72-1 through the above operations, the latch circuit 73 is activated by a signal from the latch signal control game 82-i.
-i's latcher timing lock is released. As a result, the new setting value stored in the EAROM 72-i is added to the switch drive code converter 74-1. Thereafter, the attenuator 76
-1 is set, and the setting value setting of the analog type relay is completed.

Next, the setting value setting method of the digital relay shown in FIG. 7 will also be described.

■As with the analog type relay, press the setting change control switch 83 to set the output signal A to the level.

■After selecting the relay selection switch 70 and setting the setting value to the setting value setting switch 81, select the data write switch 8.
Press 3.

■As a result, EAR (MVi 7
Similarly to 2-1, the set value in decimal and absolute value expression set by the set value setting 2 output 81 is stored.

■This value is launched to the display control (latch) circuit 86 by the 2-note timing from the address matching circuit 87, and is sent to the data selector 78 as in the case of an analog type relay.
and is displayed on the display lamp of the set value display 80 via the driver 22-79.

■The set value stored in the EAROM 85 and confirmed by the display 80 is transferred to the CP via the address selector 84.
By giving the U address to the EAROM 85,
The data is input to the memory in the microcomputer via the digital data bus 91 and used for relay calculations.

At this time, it goes without saying that if necessary, the decimal representation may be converted into binary representation using software. Further, the setting value input into the computer as described above is used as Z in the above-mentioned equations (1) and (2).

■When changing the setting values of other digital relay elements, the setting values of other digital relay elements can be changed by reselecting the relay selection switch 70 and executing the same process as above again. Needless to say.

Next, a case will be described in which the settings of this digital relay are changed online. The buffer memory 89 and its write control game 88-1 are provided for this online setting change.

In this way, when the buffer memory 89 and its write control game 88-1 are added, the EAR
The OM85 iC, ":f, vy, *v gives a timing address through the vector 84 and transfers the contents of the EAROM 85 to the backup memory 89. At this time, the CPU inputs the setting value to the buffer memory 89 and , execute the relay calculation.

Therefore, in the case of online setting change, the write signal to the backup memory 89 is prohibited by the output signal of the write control gate (signal A at q#). As a result, the backup memory 89 freezes the previous values.

In this way, the microcomputer inputs the conventional setting value from the buffer memory 89 and continues the protection relay calculation while the new setting value is stored in the EAROM 85 as described later. be able to.

The new value to be changed is set to EARO using the method described above.
Stored in Ms s. This value is of course the display control (
lunch) circuit 86, data selector 78, driver 7
Since it is displayed on the setting value display 80 via 9, it is clear that it can be checked. Furthermore, EAROM
Since the setting values stored in 85 are for digital relays, of course the values corresponding to multiple digital relays are stored in I.
li is stored next.

When all setting changes are completed, control game 188-1
The inhibition of setting value data transmission by EAROM 85 is lifted, and the new setting value is transferred from EAROM 85 to buffer memory 89. As a result, the CPU starts performing protection relay calculations using the new set value.

In the above, a setting value setting method common to both analog type relays and digital type relays that are made into custom ICs has been described. However, as is clear, the present invention is also applicable to a constant set value setting 25 for analog type relays only.

As is clear from the above description, according to the present invention, analog type relays can be
It is possible to perform setting in 0-base and absolute value expressions, and even in a relay system in which digital and analog image formats coexist, it is possible to achieve the effect that setting can be performed using the same method.

Also, online setting changes are possible for both analog and digital relays.

Further, according to the present invention, since it is possible to proceed to the next step after reconfirming the set setting value using a display lamp or the like, advantages such as preventing erroneous setting can be expected.

Furthermore, by changing the contents (74 and 75) of the switch driving code conversion circuit, it can be used for all types of relay elements, so it has great flexibility.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the protection relay system configuration 26- according to the present invention, FIG. 2 is a side view of the block configuration of a part of the digital relay in FIG. 1, and FIG. 3 is a block diagram of a phase comparison type analog relay. Block diagram, Fig. 4 shows a vector characteristic diagram of a Mori relay, Fig. 5 shows a vector characteristic diagram of a reactance relay, Fig. 6 shows a block diagram of a rectifying type analog relay, and Fig. 7 shows an example of the common setting part of the present invention. FIG. 8 is a block diagram showing a configuration example of the attenuator and switch in FIG. 7, and FIG. 9 is a diagram showing an example of a switch drive code converter. 70... Relay selection switch, 71... Selection relay address encoder, 72-1 to 72-n... Setting value storage memory (EAROM), 73-1 to 73-n -
Latch circuit? 4-1 to 74-n...Switch drive code converter, 75-1 to 75-n...Switch, 76
-1 to 76-n... Voltage attenuator, 77... Switch driving code inverse converter, 78... Data selector, 79
... Dry 8-circuit, 80 ... Setting value display, 81
... Setting value setting switch, 82-1 to 82-n...
Latch signal control gate, 83...Setting change control switch 2v- 1 Figure 2 Figure 3 Figure 16 Figure 4 Figure 5

Claims (4)

[Claims] (1) In a protection relay setting device that uses a common setting unit to set multiple analog protection relay elements, there is a relay selection switch that specifies the relay element to be set, and an absolute value expression. a set value setting switch that inputs and stores the set w value of the specified relay element in a memory; a switch drive code converter that converts the contents of the memory into an analog switch drive code; and a selection of a plurality of switches. the specified analog 1. A protection relay setting device, characterized in that the setting value of a shaped relay element is set in absolute value expression. (2) In a protection relay setting device that uses a common setting unit to set multiple analog protection relay elements, there is a relay selection switch that specifies the relay element to be set, and an absolute value expression. a set value setting switch that inputs and stores the set value of the designated relay element in a memory; - a switch drive code converter that converts the contents of the memory into an analog switch drive code; and a selection of a plurality of switches. A voltage attenuation circuit that can vary the attenuation rate by opening and closing the switch, a circuit that inversely converts the output of the switch drive code converter into a set value expressed as an absolute value, and a display circuit that displays the output of the inverse conversion circuit. , by selectively controlling the opening and closing of the switch of the voltage attenuation circuit according to the output of the switch drive code converter, the setting value setting of the specified analog type relay element is set in absolute value expression. A setting device for a protective relay, characterized in that it is configured to: (3) In a stabilizing relay setting device that uses a common setting section to set a plurality of analog protection relay elements, a relay selection switch that specifies the relay element to be set and an absolute value In the expression, a set value setting switch 7 inputs and stores the set value of the designated relay element in a memory, a launch circuit stores the contents of the memory, and a launch signal control gate controls the operation of the launch circuit. , a switch drive code converter that converts the memory contents of the latch circuit into an analog switch drive code;
A voltage attenuation circuit that can vary the attenuation rate by selectively opening and closing a plurality of switches, and selectively opening and closing the switches of the voltage attenuation circuit according to the output of the switch drive code converter, A setting device for a protection relay, characterized in that the device is configured to set the setting value of the specified analog type relay element in absolute value expression. (4) In a protection relay setting device that uses a common setting section to set a plurality of analog form factors [IJ and τ elements, a relay selection switch that specifies a relay element to be set; A set value setting switch that inputs and stores the set value of the specified relay element in the memory in absolute value expression, a launch circuit that stores the contents of the memory, and a latch signal control that controls the operation of the latch circuit. A gate, a switch drive code converter that converts the memory contents of the latch circuit into an analog switch drive code, a voltage attenuation circuit that can vary the attenuation rate by selectively opening and closing a plurality of switches, and an absolute value representation of the memory contents. and a display circuit that displays the output of the nuclear inversion circuit, and a switch of the voltage attenuation circuit.
The setting value setting of the specified analog type relay element is set in absolute value expression by selectively controlling opening and closing according to the output of the switch drive code converter. Protection relay setting device.