CN112510642A - Method for rapidly testing relay protection basic logic function of distribution network automation terminal - Google Patents

Method for rapidly testing relay protection basic logic function of distribution network automation terminal Download PDF

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Publication number
CN112510642A
CN112510642A CN202011540961.3A CN202011540961A CN112510642A CN 112510642 A CN112510642 A CN 112510642A CN 202011540961 A CN202011540961 A CN 202011540961A CN 112510642 A CN112510642 A CN 112510642A
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protection
current
phase
test
breaker
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CN202011540961.3A
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CN112510642B (en
Inventor
麦立昀
何智祥
林涛声
吴树钊
蔡思华
詹泽宇
蔡满良
王彬
葛眠俊
罗雨豪
彭丹
陈宇婷
陈若兰
李恒弛
冼海炎
姚锋
段劭凯
李翔
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention provides a method for rapidly testing the basic logic function of the relay protection of a distribution network automation terminal, which does not need to handle power failure procedures, and uses a simulated circuit breaker to replace a field switch, thereby ensuring the equipment safety and the personal safety of operation and maintenance personnel; after a relay protection parameter template provided by a manufacturer is imported in advance, parameters of relay protection devices of various types can be directly read in a working site, and the working efficiency of the site is improved; the wiring is simple, provides "a key test" function, need not to carry out artifical setting, simplifies work flow, improves work efficiency.

Description

Method for rapidly testing relay protection basic logic function of distribution network automation terminal
Technical Field
The invention relates to the field of power systems, in particular to a method for quickly testing a basic logic function of relay protection of a distribution network automation terminal.
Background
The distribution automation terminal is an important component of distribution automation, can collect and control information of a distribution switch, complete remote measurement of switch equipment and remote signaling data collection, perform switching-on and switching-off operations on the switch, and realize fault identification and isolation of a feeder switch and recovery power supply of a non-fault section. For a long time, when the automatic switch breaks down, an effective and quick field detection means is lacked, and the logic test of the protection function can be carried out only after the power failure procedure is handled and the switch is dismantled.
In the current stage, a relay protection tester is used for performing a protection function logic test on site, different connecting wires are adopted to connect the output end of the relay protection tester with a current node, a voltage node and a control point on the secondary side of a distribution automation terminal, and a current voltage value and a control signal are manually input to verify the correctness of data, the control point and the function of the distribution automation terminal.
The prior art uses a relay protection tester to perform a protection function logic test, and has the following defects:
(1) the field switch equipment is in a live running state, and the direct switching-on and switching-off operation has great safety risk and needs to handle power failure application;
(2) if the analog circuit breaker is used for replacing field switch equipment, the settings of control, output and the like of the analog circuit breaker are complex, a large amount of time is spent on wiring, and the logic test of the protection function is debugged item by item, so that the efficiency is very low;
(3) the relay protection devices manufactured by different manufacturers have different protection configuration parameters and protection logics, and operation and maintenance personnel need to spend time to be familiar with the operation flow of each model, so that the training time is long.
Disclosure of Invention
The invention provides a method for rapidly testing the basic logic function of the relay protection of a distribution network automation terminal, which simplifies the testing process and steps and improves the efficiency of on-site acceptance testing.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a method for rapidly testing the relay protection basic logic function of a distribution network automation terminal comprises the following steps:
s1: acquiring protection parameters of an automatic terminal to be tested;
s2: reading the protection constant value: overcurrent I-stage current constant value I1Time limit t of overcurrent I section1Constant current I in over-current II stage2Over-current II period time t2Zero sequence current constant value I0Zero sequence time limit t0；
S3: disconnecting the original wiring of a protection trip module loop of the protection measurement and control unit, and connecting the wiring of the analog circuit breaker to the protection trip module loop of the protection measurement and control unit FDR;
s4: disconnecting the original wiring of a current protection module loop of a protection measurement and control unit (FDR) and short-circuiting the original wiring to the ground; respectively connecting the current wiring of the A phase, the B phase and the C phase of the current generator to a current protection module loop of a protection measurement and control unit FDR; connecting the grounding wire to the current protection module loop;
s5: disconnecting the original wiring on the zero-sequence current protection module loop of the protection measurement and control unit FDR, and connecting the zero-sequence current wiring of the current generator to the zero-sequence current protection module loop of the protection measurement and control unit FDR; connecting a grounding wire to a zero sequence current protection module loop;
s6: testing the ABC three-phase protection of the overcurrent I section and the ABC three-phase protection and the zero-sequence current protection of the overcurrent II section respectively according to the sequence, if the simulation breaker does not act correctly under the current of 0.95 times and acts reliably under the current of 1.05 times and 1.2 times, the test is passed, and the protection logic is correct; otherwise, outputting the item which fails the test.
Further, in step S6, the process of testing the protection logic of the phase a of the overcurrent phase includes:
output phase A overcurrent I section test current IA(1)＝0.95·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the analog circuit breaker, and if the analog circuit breaker does not act q is 1, the condition is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
wherein, the current I output by the current generator is setx(y)Simulating the on-off condition q and the action time t of the circuit breakerk(ii) a x is A, B, C, 0 and represents A phase, B phase, C phase and zero sequence; y is 1, 2, 0 and representsA current I section, a current II section and a zero sequence; q is 0 and 1, and represents a state that the opening q of the analog circuit breaker is 0 and the closing q is 1.
Further, the process of testing the protection logic of the phase a of the overcurrent phase i further includes:
output phase A overcurrent I section test current IA(1)'＝1.05·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
Further, the process of testing the protection logic of the phase a of the overcurrent phase i further includes:
output phase A overcurrent I section test current IA(1)”＝1.2·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed;
further, the process of testing the protection logic of the phase A of the overcurrent phase II comprises the following steps:
output phase A overcurrent II section test current IA(2)＝0.95·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker does not act q is 1, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
Further, the process of testing the protection logic of the phase a of the overcurrent phase ii further includes:
output phase A overcurrent II section test current IA(2)'＝1.05·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
Further, the process of testing the protection logic of the phase a of the overcurrent phase ii further includes:
output phase A overcurrent II section test current IA(2)”＝1.2·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
Further, the test process of the protection logic for the zero sequence current comprises the following steps:
output zero sequence current I0(0)＝0.95·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker does not act q is 1, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
further, the test process of the protection logic for the zero-sequence current further comprises the following steps:
output zero sequence current I0(0)'＝1.05·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
Further, the test process of the protection logic for the zero-sequence current further comprises the following steps:
output zero sequence current I0(0)”＝1.2·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the power failure procedure is not needed to be handled, and the simulated circuit breaker is used for replacing a field switch, so that the equipment safety and the personal safety of operation and maintenance personnel are ensured; after a relay protection parameter template provided by a manufacturer is imported in advance, parameters of relay protection devices of various types can be directly read in a working site, and the working efficiency of the site is improved; the wiring is simple, provides "a key test" function, need not to carry out artifical setting, simplifies work flow, improves work efficiency.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of protection logic test for overcurrent phase I;
FIG. 3 is a flow chart of protection logic test for overcurrent phase II;
fig. 4 is a flow chart of the zero sequence current protection logic test.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for quickly testing a basic logic function of a distribution network automation terminal relay protection includes the following steps:
s1: acquiring protection parameters of an automatic terminal to be tested;
s2: reading the protection constant value: overcurrent I-stage current constant value I1Time limit t of overcurrent I section1Constant current I in over-current II stage2Over-current II period time t2Zero sequence current constant value I0Zero sequence time limit t0；
S3: disconnecting the original wiring of a protection trip module loop of the protection measurement and control unit, and connecting the wiring of the analog circuit breaker to the protection trip module loop of the protection measurement and control unit FDR;
s4: disconnecting the original wiring of a current protection module loop of a protection measurement and control unit (FDR) and short-circuiting the original wiring to the ground; respectively connecting the current wiring of the A phase, the B phase and the C phase of the current generator to a current protection module loop of a protection measurement and control unit FDR; connecting the grounding wire to the current protection module loop;
s5: disconnecting the original wiring on the zero-sequence current protection module loop of the protection measurement and control unit FDR, and connecting the zero-sequence current wiring of the current generator to the zero-sequence current protection module loop of the protection measurement and control unit FDR; connecting a grounding wire to a zero sequence current protection module loop;
s6: testing the ABC three-phase protection of the overcurrent I section and the ABC three-phase protection and the zero-sequence current protection of the overcurrent II section respectively according to the sequence, if the simulation breaker does not act correctly under the current of 0.95 times and acts reliably under the current of 1.05 times and 1.2 times, the test is passed, and the protection logic is correct; otherwise, outputting the item which fails the test.
As shown in fig. 2, in the step S6, the procedure of testing the protection logic of the phase a of the overcurrent phase i is as follows:
1) output phase A overcurrent I section test current IA(1)＝0.95·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the analog circuit breaker, and if the analog circuit breaker does not act q is 1, the condition is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
2) output phase A overcurrent I section test current IA(1)'＝1.05·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
3) output phase A overcurrent I section test current IA(1)”＝1.2·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed;
wherein, the current I output by the current generator is setx(y)Simulating the on-off condition q and the action time t of the circuit breakerk(ii) a x is A, B, C, 0 and represents A phase, B phase, C phase and zero sequence; y is 1, 2 and 0 and represents an overcurrent I section, an overcurrent II section and a zero sequence; q is 0 and 1, and represents a state that the opening q of the analog circuit breaker is 0 and the closing q is 1.
As shown in fig. 3, the test procedure of the protection logic for the phase a of the overcurrent phase ii is as follows:
1) output phase A overcurrent II section test current IA(2)＝0.95·I2Duration from 0s to (t)2+0.1) s, recording the on-off of the analog circuit breakerIn case of failure, if q is 1, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
2) output phase A overcurrent II section test current IA(2)'＝1.05·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
3) output phase A overcurrent II section test current IA(2)”＝1.2·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
As shown in fig. 4, the test procedure of the protection logic for the zero-sequence current is:
1) output zero sequence current I0(0)＝0.95·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker does not act q is 1, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
2) output zero sequence current I0(0)'＝1.05·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
3) output zero sequence current I0(0)”＝1.2·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
All test results are output as follows:
TABLE-1 results of the tests
Test items Test results
Overcurrent I section protection logic test (A phase) Go/no-go
Overcurrent I section protection logic test (B phase) Go/no-go
Overcurrent I section protection logic test (C phase) Go/no-go
Overcurrent II section protection logic test (A phase) Go/no-go
Overcurrent II section protection logic test (B phase) Go/no-go
Overcurrent II section protection logic test (C phase) Go/no-go
Zero sequence current protection logic test Go/no-go
The same or similar reference numerals correspond to the same or similar parts;
the positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A method for rapidly testing the relay protection basic logic function of a distribution network automation terminal is characterized by comprising the following steps:
s1: acquiring protection parameters of an automatic terminal to be tested;
s2: reading the protection constant value: overcurrent I-stage current constant value I1Time limit t of overcurrent I section1Constant current I in over-current II stage2Over-current II period time t2Zero sequence current constant value I0Zero sequence time limit t0；
S3: disconnecting the original wiring of a protection trip module loop of the protection measurement and control unit, and connecting the wiring of the analog circuit breaker to the protection trip module loop of the protection measurement and control unit FDR;
s4: disconnecting the original wiring of a current protection module loop of a protection measurement and control unit (FDR) and short-circuiting the original wiring to the ground; respectively connecting the current wiring of the A phase, the B phase and the C phase of the current generator to a current protection module loop of a protection measurement and control unit FDR; connecting the grounding wire to the current protection module loop;
s5: disconnecting the original wiring on the zero-sequence current protection module loop of the protection measurement and control unit FDR, and connecting the zero-sequence current wiring of the current generator to the zero-sequence current protection module loop of the protection measurement and control unit FDR; connecting a grounding wire to a zero sequence current protection module loop;
s6: testing the ABC three-phase protection of the overcurrent I section and the ABC three-phase protection and the zero-sequence current protection of the overcurrent II section respectively according to the sequence, if the simulation breaker does not act correctly under the current of 0.95 times and acts reliably under the current of 1.05 times and 1.2 times, the test is passed, and the protection logic is correct; otherwise, outputting the item which fails the test.
2. The method for rapidly testing the basic logic function of the network automation terminal relay protection according to claim 1, wherein in the step S6, the test procedure of the protection logic of the phase a of the overcurrent phase i includes:
output phase A overcurrent I section test current IA(1)＝0.95·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the analog circuit breaker, and if the analog circuit breaker does not act q is 1, the condition is correct; otherwise, the test is not passed; resetting the analog circuit breaker;
wherein, the current I output by the current generator is setx(y)Simulating the on-off condition q and the action time t of the circuit breakerk(ii) a x is A, B, C, 0 and represents A phase, B phase, C phase and zero sequence; y is 1, 2 and 0 and represents an overcurrent I section, an overcurrent II section and a zero sequence; q is 0 and 1, and represents a state that the opening q of the analog circuit breaker is 0 and the closing q is 1.
3. The method for rapidly testing the basic logic function of the relay protection of the distribution network automation terminal as claimed in claim 2, wherein the process of testing the protection logic of the phase a of the overcurrent phase i further comprises:
output phase A overcurrent I section test current IA(1)'＝1.05·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
4. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 3, wherein the process of testing the protection logic of the phase A of the overcurrent phase I further comprises:
output phase A overcurrent I section test current IA(1)”＝1.2·I1Duration from 0s to (t)2-0.1) s, recording the on-off condition of the simulated breaker if the simulated breaker is at tk＝t1If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
5. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 4, wherein the test process of the protection logic of the phase A of the overcurrent phase II comprises the following steps:
output phase A overcurrent II section test current IA(2)＝0.95·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker does not act q is 1, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
6. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 5, wherein the process of testing the protection logic of the phase A of the overcurrent phase II further comprises:
output phase A overcurrent II section test current IA(2)'＝1.05·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
7. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 5, wherein the process of testing the protection logic of the phase A of the overcurrent phase II further comprises:
output phase A overcurrent II section test current IA(2)”＝1.2·I2Duration from 0s to (t)2+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t2If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
8. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 7, wherein the test process of the protection logic of the zero-sequence current comprises:
output zero sequence current I0(0)＝0.95·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker does not act q is 1, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
9. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 8, wherein the test process of the protection logic of the zero-sequence current further comprises:
output zero sequence current I0(0)'＝1.05·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise, the test is not passed; and resetting the analog circuit breaker.
10. The method for rapidly testing the basic logic function of the distribution network automation terminal relay protection according to claim 9, wherein the test process of the protection logic for the zero-sequence current further comprises:
output zero sequence current I0(0)”＝1.2·I0Duration from 0s to (t)0+0.1) s, recording the on-off condition of the analog breaker, and if the analog breaker is at tk＝t0If the time action is on the opening q is 0, the operation is correct; otherwise the test fails.
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JPH11205996A (en) * 1998-01-19 1999-07-30 Hitachi Ltd Breaker control and protective relay device
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