JPS59110320A - Tester for protecting relaying 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] [Technical Field of the Invention] The present invention relates to a test device for a protective relay device, and particularly to a test device for a protective relay device that simulates and outputs the amount of electricity in a power system. .

[Technical background of the invention]

Conventionally, a simulated power transmission line facility as shown in FIG. 1 has been used to test protective relay devices used in power systems.

An example of this is "Testing and Maintenance of Protective Relays" by Mikami (
Ohmsha, 1969, p. 199-212). In Figure 1, IAl 1B is a generator simulation circuit, 2A and 2B are transformer simulation circuits, 3A% 3B
is a power transmission line simulation circuit (simulating a power transmission line with reactance), 4
is a CTT pseudo-circuit, 5 is a PTT pseudo-circuit, and 6 is a breaker (C
B) A simulation circuit, which also includes a load simulation circuit (not shown) as a component. The simulated transmission line equipment shown in Fig. 1 is a model in which the PTT simulated circuit 5 and the CT simulated circuit 4 are generated, and the PT ratio and CT ratio are changed according to the scale of the actual system to simulate the transmission. The secondary heavy voltage current of the electric wires PT and CT is the same as that of the actual system, and the direct protective joint 1U. It is introduced into the device to drive relay electricity.

However, in order to simulate the influence of parallel two-circuit droplets to be protected from the parallel system, such as circulating renal flow observation in multi-circuit parallel transmission lines, it is necessary to Equipment that simulates this is essential. If these were implemented using conventional equipment, the equipment C1 would be large and the cost would be high. or,
It is also difficult to set highly accurate conditions, and it can be said that it is extremely difficult to simulate such a complicated system phenomenon with the frame simulation lightning transmission equipment shown in Figure 1. In order to deal with the complexity of equipment, there is a method of using digital processing equipment.
13393O r protective relay testing device” will be explained with reference to FIG.

In FIG. 2, a data input section 2o is a section that sequentially stores digital data simulating an AC waveform in a memory 21. The digital data is, for example, discrete data obtained by sampling a sine wave at a constant period. The data stored in the memory 21 is sequentially sent from the data control section 22 to the A/A conversion section 23 at the same time as the test starts. Since the data converted to analog is a weak signal, it is current or voltage amplified by an amplifier 24 and output to a relay under test 25 .

The test apparatus shown in FIG. 2 is capable of testing not only a single relay but also a relay device. That is, the voltage and current data of the simulated power transmission line are recorded in the data input section 20,
Input to this device at any time and test the relay device.

[Problems with background technology]

By the way, in the dynamic characteristic test of the relay device, we not only verify the response C of the relay device to voltage and current simulating a system fault, but also verify the opening of the CB by the operation of the relay device and the response of the relay device after the CB is opened. is necessary. However, since the test apparatus shown in FIG. 2 is not intended primarily for this type of test, there is no feedback signal from the relay under test 25 to the data control unit 22, and the operation of the relay under test 25 is not controlled. It is not possible to simulate the accompanying opening of the CB and the response of the relay under test 25 after the opening of the CB.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a test device for a protective relay device that can simulate complex system phenomena.

[Summary of the invention]

In the present invention, the system failure calculated data, that is, the voltage and current data before the fault, the transient data immediately after the fault, the steady data after the fault, and the data after the circuit breaker is opened, is divided into appropriate addresses in the memory in advance. By storing these data and reading them out during a test run, the system produces the same status output as the system fault and performs a series of tests.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 3 is a block diagram of an embodiment of the protective relay device according to the present invention.

In FIG. 3, the data input unit 31 inputs voltage/current data simulating the power system, such as pre-fault data, transient data immediately after the fault, steady data after the fault, and data after the CB is opened, to a predetermined location in the memory 32. This is the part that is stored in the address area of . Examples of specific input media for the data input section 31 include paper tape, ROM, magnetic tape, and floppy disk. The data simulating the power system is the result of calculation using a general-purpose transient phenomenon analysis program (described later) or the like. The memory 32 receives the seat address signal S1 from the data control section 33 and outputs data S2 at the corresponding address to the data control section 33.

The control unit 33 controls the protective relay device 35 to be tested.
inputs the device output 35 (for example, trip output), outputs a predetermined address signal S1 to the memory 32, inputs the data S2 at the corresponding address, and performs D/A conversion of digital data S3 equal to the data S2. output to section 34. Here, the data input section 31, memory 32, and data control section 33 are collectively referred to as a first device 30. D/A
The conversion unit 34 (second device) is the data control unit 3
3 inputs digital data S3, performs digital/analog conversion, and outputs an analog signal S4 to the protective relay device 35. The protection relay device 35 inputs the analog signal S4 and outputs the device output S5 to the data control unit 33 according to the response and sequence of the protection relay itself.Here, the general purpose transient phenomenon program (EMTP) will be explained in detail. . The outline is, for example, "Ir Electrical Engineers of Japan Journal" (1
Vol. 02, No. 6, June 1987, p. 487-494) written by Kan Ame [described in the general-purpose transient phenomenon analysis program EMTPJ]. EMTP is aimed at analyzing various steady and transient phenomena in power systems, etc. When targeting a three-phase power system, EMTP analyzes power transmission lines/cables, loads, transformers, arresters, power supplies, rotating machines, switches, rectifiers, etc. Elements such as elements and control systems can be simulated. As input data, (1) calculation time step, calculation end time, data unit system, result output format,
(2) Information about branches, branch voltages, and current output formats when a given electrical circuit is expressed as nodes and branches, (3) Information about various switch elements, switch terminal voltages, and current output formats; ( 4) Type and conditions of power supply, (5) Output format of node voltage, etc. are required.

As outputs, node voltages, branch voltages/currents, switch terminal voltages/currents, etc. can be obtained.

In addition, the initial power flow conditions are automatically set based on the terminal voltage and phase angle of the power supply.

FIG. 6 is a diagram showing address assignment of data stored in the memory 32. Here, a case will be explained in which the data is a voltage (subscript v) and a current (i). Address A
. o, Aol, Ao2..." 02n is the voltage before the accident, 1b flow data D, Dvoo 100"
voj...''inn is stored. Next, the transient data immediately after the accident Dvjo ``iTo'' Dvl is stored at addresses A1o1A, 1, A12..., A12m.
l ”' ”” ilm is stored, address A2o1
A21, A22''...-A22tK Data after CB release Dv2oXDi□., Dv21...Dk21 are stored.

Also address A3o”A31,A52 “・””! 52
Data after releasing CB to kDv40"i30'D
v31...”・, D, 3k are stored.

FIG. 5 is a flowchart showing the processing of the data control unit 33. Stella ff1 is for pre-accident data output processing and is at address A. oXAo1A02 ”'
...', A02n data Dv00 'Dioo'
DvOj ”...D,... are output in sequence. Next, Stella ff2 is a process of outputting transient data immediately after the accident, and data at addresses A1o1A11, A12..., A, Dν1o12m Di10% Dvll...・' Dilm is output sequentially. Step f is the process of outputting one sansol of steady data after the accident. First, address A 1A is output.
Data 20 21 Dv20 ” i20 is output. Next, step f4
A determination is made as to whether the equipment is "1" (present) or "0" (absent). "
1", there is a device output, so proceed to Stella ff6. or,
``During OJ, there is no output from the device, so proceed to Stellar FF5.

Stellar ff5 is a memory address update process for output data, and in the first time, the address is changed from A20 "2j to A.
2□, updated to A23. Then, return to step f3 and proceed to Noatres A22. A23 notator Dv21°D,
I'm 21 years old. Generally, the address is A on Stella FF5.
22P, A22P, +, update to A2□P+21 A22, and in step f3 address A22P+2”
The data Dv2p+1' Di2p+ of 22F+3 is output. Note that the steady data after the accident is prepared for one cycle and output again. Stella 7af6 is...
This is a judgment of current zero cross detection, and detects that the current data crosses zero (for example, the data is represented as a two's complement, and the sign of the data is determined using the most significant bits roJ and rlJ, and it is determined whether the current data is positive → negative, or (a method of detecting negative → positive, etc.), and when it is a shoulder, proceed to step f7. Step f when nothing
Return to step 3. The process of step f6 is based on the fact that the timing at which CB is generally opened is when the current becomes zero. Below step f1 to step f6
are collectively referred to as step F1. Step f7 is CB
This is data output processing after release, and addresses A, A
.

50 31 A52"""Data Dv5 for A52
[+'D13ol Dv31..., bink is output in sequence.

FIG. 4 shows the time change of each signal shown in FIG. 3. The digital data S3 is 1 (at 1°, the pre-accident data is current = Dioo..., voltage ■ =
Takes the value of Dv0゜” vol... t-t2
Since an accident occurs at t, the digital data S3 is
When ≦t<t2, I=Dl as transient data immediately after the accident,
. ......,v=Dv,. ``Vll......'' value, if t2≦t<t3, the steady data after the accident is I=Di2o010XV''Dv2oIDv2111°
takes the value of

When 1=13, the device output S5 becomes "1", and this is detected by software processing. The digital data S3 is t
, ≦t. At t4, p, t is the steady data after the accident.
= When the current zero cross is detected at t4, at t≧t4, C
I: D, as data after B is released. ..., v-D
v3o, Dv3. Takes the value of... The analog signal S4 is obtained by D/A converting the digital data S3.

As explained above, according to the present invention, firstly, in the conventional simulated power transmission equipment, data calculated in advance by the EMTP etc. is used even for complex phenomena such as simulated power, so it is easy to
And it can be simulated with high accuracy. Second, since the device output of the protective relay device is used to change the input to the protective relay device, the response of the protective relay device, the accompanying CB opening, and the protective relaying after the CB is opened. It is possible to verify the response of the device.

FIG. 7 is a flowchart of another practical JM example of the present invention. FIG. 7 shows the process of step f8 added between step F1 and step f7 of the flowchart of FIG. The step f8 is processing of the steady datum cycle output after the accident (example a=1), and the address of the output data in the current zero cross detection (step f6) is A.
At the time of 28, data at address A29+2 is output next. Further, the cycle number a may be selected as an integer value suitable for simulating the time required for CB.

FIG. 8 is a time change diagram of each newsletter for process 1 in FIG. txt3 is the same as FIG. 4.

When 1=13, the device output s5 becomes "1", which is detected by software processing, and when 1=15, a current zero cross is detected.

At t2≦t<t5, the digital signal s3 is I-Di2o town..., V-Dv2o, D as steady data after the accident.
Takes the value of v21... Also at t5≦t<t6, the post-accident steady data (for one cycle) is repeated. When t≧t6, the data S3 in R11 is the data after the CB is released, and DI=DI.・・・・・・、
v=Dv3o, Dv3. Takes the value of... Note that, as in FIG. 4, the analog signal S4 is obtained by D/A converting the digital data s3. According to this example of the invention, it is also possible to accurately simulate the time required for the CB to open. In order to simplify the software processing, we will explain the case where the current zero cross determination process is not performed.Applicable to applications where the timing of transition from steady data output after an accident to data output after CB opening is not a big problem. Fig. 9 is a flowchart of software processing in yet another embodiment of the present invention. Fig. 9 is different from Fig. 5 in that the processing of step f6 is not included.

If step f4 indicates that the device output is negative, the process advances to step f7. FIG. 10 is a diagram showing temporal changes in each signal corresponding to the processing in FIG. 9. txt3 is the same as FIG. 4. When 1=13, the device output s5 becomes 1-1" υ, and when the software processing detects this, t≧t, the digital data s3 becomes I=D as the data after the CB is opened.
..."" Dv50 ' Dv31...... Calculate the value of 30.

Similarly, it is also possible that step f60 of the torrent flow zero cross detection process in step F of the software process in FIG. 7 is not performed. That is, after detecting the device output in step f5, the process immediately proceeds to Stella 7° f8, and the steady state data after the accident is started.

Then perform a cycle output processing. These examples simplify software processing.

The example described above is a case in which data calculated by the EMTP or the like is stored in advance on a medium (such as a floppy disk) and then input into the memory 32 via the data input section 31 in FIG. 3. Next, a computer that performs calculations such as EAfrp is directly connected to the memory 32, and EMT is performed without an input medium.
An example will be shown in which data calculated by P, etc. can be stored in the memory 32, and conditions for each test case can be set in the computer as appropriate.

FIG. 11 is a block diagram of another embodiment of the present invention.

The input unit 40 is a part into which input data S6 (system conditions, initial values, etc.) necessary for the calculator 41 to perform transient phenomenon division using EMTP etc. is inputted, and specifically, data on paper cards or the status of switches, etc. Enter. The computer 41 is the EMT
In addition to P, it has an input processing program (a program for reading normally used switches, etc.) that reads input data. Then, the calculator 41 inputs the input data S6 using the input processing program, etc., and inputs the input data s.
Perform transient calculations using EMTP etc. under the conditions shown in 6.
The obtained voltage and current data S7 are output to the memory 32. The configuration of the latter stage of this memory 32J:#) is the same as that shown in FIG. Here, the input section 40. The computer 41, memory 32, and data control section 33 are hereinafter collectively referred to as a first device 30A. Further, the noft L principle of the data control section is the same as that shown in FIG. 5, FIG. 7, or FIG. 9.

According to this example, test conditions can be easily set as necessary in the case of conventional simulated power transmission line equipment in the case of a protective relay device.

The above reli stores data that has been transiently calculated in advance in the memory 32.
The case where it is stored in is shown. However, the present invention is not limited to this. (By directly controlling calculations for transient phenomenon analysis using EMTP, etc., it is possible to simplify the equipment and shorten the time from setting test conditions to starting the test.) is shown below.

FIG. 12 is a configuration diagram of still another embodiment of the present invention. The difference between FIG. 12 and FIG. 11 is that FIG. 12 does not have the memory 32 and the control unit 33.

The calculator 41 inputs the data or state of the input section 40, performs transient phenomenon calculations using EMTP, etc. under the input conditions, and stores and converts the resulting voltage and current data as digital data S7. output directly to section 34. In addition, the machine 41 inputs the device output S5 of the protective relay @35, and when there is the device output S5, it calculates by changing the conditions for transient phenomenon calculation, and converts the voltage and current data under the conditions into digital data. It is output to the converter 34 as S7. The data input section 40 and the computer 41 are collectively referred to as the first device 30.
Call it B.

Figure 13 shows 1. 13 is a flowchart showing software processing in the case of the configuration example of FIG. 12. FIG. In addition to EMTP, the computer 41 has an input processing program (a nologogram for inputting the states of switches, etc.) that reads the input data S6 and the state of the device output S5. Step f. is a process of reading input data S6 using an input processing program or the like. Next, step "11" is a process of performing transient phenomenon calculation (1) using the EMTP etc. based on the human data S6.Sten ff12 is a process of data output (1),
The voltage/current data (pre-fault data, transient data immediately after the fault, steady data after the fault, etc.) obtained in step f11 is output. Step f15 is a process of reading the state of the device output S5 using the input processing program.

Next, step f14 is 11J constant of device output detection,
It is determined whether the device output S5 is "11" (present) or "O" (absent). When this is "1", there is an output from the device, so the process advances to step f15. If the value is "0", the process returns to step f11 because the device is not available. Step fis is a process of system transient calculation (2), in which a transient phenomenon calculation is performed by EMT P or the like under the condition that the device output S5 of the protection twin electric device 35 is the shoulder. Step f16 is data output (2) processing,
Outputs the voltage/■υIL data (steady data after an accident, data after opening the CB, etc.) obtained with Stella ff15.

According to this example, in addition to simplifying the test equipment, the computer 4
1 calculates transient phenomena in real time, so the time from setting test conditions to starting the test can be shortened. Note that as the computer 41, a high-speed computer capable of real-time processing is used.

The example explained above was a case of one voltage and one current, but the output amount of voltage and current is the required number (for example, voltage 4
It is also possible to divide the current into two phases, four-phase current, etc.). This can be done by storing as much data as the required output amount in the memory 32 in the block diagrams of FIGS. 3 and 11.

Further, in FIG. 12, it is possible to calculate the required output amount using the computer 41.

Furthermore, the output of the D/A converter 34 may be input and amplified and inputted to the protective relay device ff135, and the input S4 and output S5 of the protective relay device 35 described in 1 may be input, recorded, and displayed. It is not to say that adding the above can be easily realized as a combination of the present invention and the prior art.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

■ Even complex system phenomena that are difficult to simulate with conventional simulated power transmission line equipment can be simulated easily and with high accuracy because calculation data from general-purpose transient phenomenon analysis programs such as EMTP are used.

■ By using the device output of the protective relay device to change the input to the protective relay device, the protective relay device responds in the event of a system fault, thereby opening the breaker. It is possible to verify the subsequent response of the protective relay device.

■ Regarding the simulation of the timing of equipment output and interrupter opening, it is possible to simulate the response with high accuracy by methods such as current zero cross detection and output of post-fault steady data equivalent to the time required to open the circuit breaker. be.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional simulated power transmission facility, FIG. 2 is a diagram showing a conventional test device using a digital processing device, and FIG. 3 is a block configuration diagram of an embodiment of the test device of the present invention. 4 is a diagram for explaining response, FIG. 5 is a flowchart for explaining operation, FIG. 6 is a diagram showing allocation of accident data in memory, and FIG. 7 is a flowchart showing processing of another embodiment of the present invention. , FIG. 8 is a response explanatory diagram for FIG. 7, and FIG. 9 is a flowchart showing processing of still another embodiment of the present invention.
10 is a response explanatory diagram for FIG. 9, FIG. 11 is a block diagram of still another embodiment of the invention, and FIG. 12 is a block diagram of still another embodiment of the present invention (-ρJM diagram, FIG. is a flowchart showing the process I'll in the example of FIG. 12. 20.31.40...Data input unit 21132...
・Memory 22.33... Data control section 23.
34...D/A conversion section 24...Amplifier 25
...Protected relays 41...Total '3A-machine (7317) Agent Patent attorney Nori Chika 11 (
(and 1 other person) Child 1 Figure 2 Figure 5 Figure H Figure 3'0A SaO Go4← -hθ

Claims (7)

[Claims] (1) In a test device for a protective relay device that simulates the current state of a gravity system and introduces it into the test equipment, the initial system state, the steady state regarding the current state, the transient state immediately after the occurrence of an accident,
A memory circuit that stores each digital data of the steady state after the accident and the state after the breaker is opened, and the information stored in the memory circuit.1. a data control circuit that controls the ψ data and changes the output data to the protective relay device 6' under test when the device output from the protective relay 1 device under test is input; Equipped with a digital-to-analog converter that converts each stored data into analog data and inputs it to the protection relay device under test, it is possible to perform a series of tests according to the device output from one protection relay device under test. Naho Hi A-type device 1° test equipment. (2) The test device for a protective relay device according to claim 1, wherein the memory circuit stores digital data calculated in advance by a general-purpose transient phenomenon analysis algorithm. (3) Patent claims 1 to 1, which are characterized in that by providing a calculation ladder in the front stage of the memory circuit, one-sided phenomenon calculation is performed using a general-purpose transient phenomenon analysis program, and digital data regarding the amount of grid electricity is created. A test device for a protective relay device according to item 1. (4) When the tri-tone output from the protective relay device under test is derived, the output data for the protective relay device under test is changed from accident data to data after the breaker is opened. A test device for a protective relay device according to paragraph 1, paragraph 2, or paragraph 3. (5) The trip output of the protective relay device under test is derived, and when a zero cross of the current data is detected after the trip output is derived, the output data for the protective relay and device under test is determined from the accident data to open the breaker. A test device for a holding relay device according to claim 1, 2, or 3, characterized in that the test device changes to a later data. (6) After deriving the trisozoelectric output from the protective relay device under test or detecting a spill loss of current or current data, after outputting fault data for a predetermined period of time to the protective relay device under test, and after opening the breaker. A test device for a protective relay device according to claim 4 or 5, characterized in that the test device changes the data to data. (7) In a test device for a protective relay device that simulates the amount of electricity in a power system and introduces it into the relay under test, it is possible to perform a steady state, a transient state immediately after an accident, a steady state after an accident, and a 4 intelligence that calculates each digital data in the state after the circuit is opened; and 4 intelligence that controls each digital data and calculates the output data to the protective relay device under test when the device output from the protective relay device under test is input. The computer is equipped with a total of 7J-e each having a data control function to change data, and a digital-to-analog converter that converts digital data from the computer into analog data and inputs it to the protective relay device under test. Before deriving the device output of the test protective relay device, the first system transient calculation is performed to output voltage and voltage data corresponding to the steady state, the transient state immediately after the fault occurs, and the steady state after the fault. and a second system transient meter function that outputs voltage and current data corresponding to a steady state after an accident and a state after the breaker is opened after deriving the device output. The number of tests β for the maintenance relay system u et al.