CN107783070A - Small Electric Current Earthing And Routing Device round cut function automatic detection method - Google Patents
Small Electric Current Earthing And Routing Device round cut function automatic detection method Download PDFInfo
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- CN107783070A CN107783070A CN201710979064.4A CN201710979064A CN107783070A CN 107783070 A CN107783070 A CN 107783070A CN 201710979064 A CN201710979064 A CN 201710979064A CN 107783070 A CN107783070 A CN 107783070A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a kind of Small Electric Current Earthing And Routing Device round cut function test method, including power system Real Time Digital Simulator, power amplifier, the Small Electric Current Earthing And Routing Device for possessing round cut function.RTDS real-time simulators produce ground signalling, and ground signalling is amplified to the Small Electric Current Earthing And Routing Device for possessing round cut function by power amplifier, the Small Electric Current Earthing And Routing Device for possessing round cut function receives the signal after amplification, by analyzing signal, select the larger N bars circuit of probability and cut jump in turn, then trip signal is fed back to the GTFPI boards of power system Real Time Digital Simulator, by corresponding outlet switch action in control circuit simulation model come to choosing circuit to carry out trip operation, the Small Electric Current Earthing And Routing Device for possessing round cut function judges whether route selection is correct according to outlet switch tripping operation result.The overall process of test automatically controls execution by RSCAD softwares, realizes automatically controlling for test process.
Description
Technical field
The invention belongs to power system route selection functional test technical field, and in particular to a kind of Small Electric Current Earthing And Routing Device wheel
Cut function test method.
Background technology
China's low and medium voltage distribution network mostly uses neutral point indirect earthing mode.Single-phase earthing event occurs in this kind of power network
The capacitance current of circuit is flowed only through during barrier, at earth fault, its numerical value is that several peaces are pacified to two, 30, due to not producing short circuit
Electric current, and line voltage is still symmetrical, does not influence the normal power supply to user, allow to continue to run with 1~2 by regulatory requirements small
When.Now, non-faulting phase-to-ground voltage rises to line voltage level, and its weakness that insulate may be caused to occur to puncture over the ground, so as to
Single-phase earthing once occurs for fault spread, the power distribution network especially based on cable, cable, develop into more it is permanent alternate or
Three-phase fault.Even more serious, system operates with failure for a long time, easily sends out people and animals' incident of injury.Therefore, small current earthing wire-selecting
Device can select faulty line in time when earth fault occurs for system, prompt substation operation personnel to cut off failure in time, keep away
The harm being grounded when system is long is exempted from.
Whether small current neutral grounding device needs the performance of test device qualified before entering network operation, and simple method of testing is
Voltage x current amount near threshold value is acted by relay protection instrument output device, can judgment means correctly act, this side
Method is more rough, and added amount is all stable and lasting, it is difficult to reflects line selection apparatus for high resistance ground, arcing ground etc.
The action behavior of complex situations.And can build the actual model of system operation in RTDS real-time simulators, preferably reflection
Voltage characteristic amount under various Groundings, while at the time of can control the failure to occur, instant observation system running situation, is small
The excellent tool of Current Alignment Device test.
It is 90% to have preferred accuracy requirement of the grid company to Small Electric Current Earthing And Routing Device now, therefore usual feelings
It is concerned only with the correctness of a route selection result when being emulated under condition using RTDS real-time simulators, but current line selection apparatus
Majority is equipped with taking turns cutting method in algorithm, to prevent it is preferred it is unsuccessful in the case of can also be improved by automatic jumping circuit of cutting in turn twice
The correctness of route selection.But not yet it is related to the small electricity for possessing round cut function in current Small Electric Current Earthing And Routing Device test
Flow line-selected earthing device method of testing.
The content of the invention
The invention provides a kind of Small Electric Current Earthing And Routing Device round cut function test method, this method can realize low current
The automatic test of line-selected earthing device round cut function, reduce work about electric power personnel and test Small Electric Current Earthing And Routing Device round cut work(
The workload of energy.
A kind of Small Electric Current Earthing And Routing Device round cut function automatic detection method, comprises the following steps：
S1. Small Electric Current Earthing And Routing Device round cut functional test platform, including power system Real Time Digital Simulator, power are built
Amplifier, the Small Electric Current Earthing And Routing Device for possessing round cut function；The power system Real Time Digital Simulator has GTAO plates
Card, GTFPI boards and RSCAD softwares, the input of the power amplifier connect the GTAO boards, described in output end connection
Possess the input of the Small Electric Current Earthing And Routing Device of round cut function, the Small Electric Current Earthing And Routing Device for possessing round cut function
Output end be connected with the GTFPI boards；
S2. build simulation model, using the software of power system Real Time Digital Simulator build with practical operation situation similar in
Circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
S3. small current neutral grounding test event is selected, test event includes nature of trouble, position on the line, line occur for failure
Phase size and earth fault continue length when property, line harmonic content, the failure on road occur, and different test events is entered
Initial conditions of the row combination to occur as failure, then in the RUNTIME modules of RSCAD softwares, set RSCAD software energy
The adjustable control of each bar circuit emulation model of continuous control；
S4. when earth fault occurs for circuit, the GTAO boards output bus residual voltage of RTDS real-time simulators and outlet zero
Sequence current signal to power amplifier carries out signal amplification, then inputs the signal after amplification to the small electricity for possessing round cut function
Flow in line-selected earthing device, possess the signal of the Small Electric Current Earthing And Routing Device receiving power amplifier output of round cut function, lead to
Cross and signal is analyzed, select a preferred circuit, the wherein alternative circuit of N bars, N ＞ 1, then according to route selection order, will select
The trip signal of middle circuit outlet switch feeds back to the GTFPI boards of power system Real Time Digital Simulator, and RSCAD softwares pass through
Corresponding outlet switch is acted to choosing circuit to carry out trip operation, to possess the small of round cut function in control circuit simulation model
Current earthing line selection apparatus judges whether route selection is correct according to outlet switch tripping operation result.
Further, the step S2 is specifically included：Circuit outlet design in circuit emulation model comprises at least three classes
Circuit emulation types of models, i.e., pure overhead transmission line, pure cable run, aerial cable joint line, and imitated in above-mentioned three classes circuit
The outlet design of true mode type sets multiple adjustable controls, and the adjustable control includes：A. the length of three class circuits is big
It is small that adjustable control A is set；B. earth fault is set in the stage casing of three class circuits, end respectively, and the ground connection of trouble point is opened
Close and adjustable control B is set, the grounding resistance of trouble point is adjustable control C；C. the outlet switch of every circuit is set respectively
T delayed automatic reclosing function.
Further, the step S2 also includes：DRAFT in power system Real Time Digital Simulator RSCAD softwares
In module, the different action sequences of earthed switch in simulation model are edited, to set failure that moment and trouble duration occurs.
Further, the step S2 also includes：In power system Real Time Digital Simulator RSCAD softwares
In RUNTIME modules, build and the adjustable control A, adjustable control B, adjustable control C is corresponding controls object.It is excellent
Choosing, the control object includes：Set sliding block to come the length of adjusting circuit, earth point grounding resistance size, settings button to come
Control earthed switch and outlet switch opening and closing, build outlet switch status indicator lamp, set outlet switch control word with it is described
GTFPI boards control word is consistent, builds circuit residual voltage and zero-sequence current oscillogram control.
Further, the nature of trouble includes metallic ground, arc grounding and high resistance ground.
Further, in the step S3, in the RUNTIME modules of RSCAD softwares, set RSCAD softwares automatic
The adjustable control for controlling each bar circuit emulation model is specially：According to the test event of setting, in power system real-time digital
In the RUNTIME modules of emulator RSCAD softwares, design can adjust control A described in continuous control simulation model, can adjust
The program that control B and adjustable control C value size variation and switch motion change, and can be in real time by RUNTIME modules
Observe in the case of circuit small current neutral grounding, the bus residual voltage of circuit and the dynamic change situation of Ge Lu outlet zero-sequence currents.
Further, in the step S4, possesses the Small Electric Current Earthing And Routing Device of round cut function according to route selection order, tool
It is real-time that the trip signal for choosing circuit outlet switch is fed back to power system by the Small Electric Current Earthing And Routing Device of standby round cut function
The GTFPI boards of digital simulator, RSCAD softwares are by corresponding outlet switch action in control circuit simulation model come to choosing
Middle circuit carries out trip operation, and the Small Electric Current Earthing And Routing Device for possessing round cut function judges choosing according to outlet switch tripping operation result
The whether correct detailed process of line includes：
S4-1. the Small Electric Current Earthing And Routing Device for possessing round cut function is delayed T1s tripping first choice lines after earth fault is experienced
Road outlet switch, the Small Electric Current Earthing And Routing Device for possessing round cut function can't detect earth fault, then judge the preferred line of this bar
Road is faulty line, and first choice success, outlet switch completes single shot reclosing operation by inherent delay T, in singlephase earth fault feelings
No longer tripping after condition lower switch single shot reclosing, if ground signalling disappears, for instantaneity earth fault, EP (end of program)；If tool
The Small Electric Current Earthing And Routing Device of standby round cut function remains to detect earth fault, then is permanent earth fault, line selection apparatus
Accelerated trip signal tripping outlet switch after triggering one, ground signalling disappear, EP (end of program)；
If S4-2. preferred failure, an alternative circuit outlet switch is jumped off after line selection apparatus delay T1s, possesses round cut function
Small Electric Current Earthing And Routing Device can't detect earth fault, then judges that the alternative circuit of this is faulty line, the second wheel route selection into
Work(, outlet switch are completed single shot reclosing and operated, the no longer tripping after singlephase earth fault situation lower switch single shot reclosing, if
Ground signalling disappears, then is instantaneity earth fault, EP (end of program)；If possesses the Small Electric Current Earthing And Routing Device of round cut function still
Earth fault can be detected, then be permanent earth fault, line selection apparatus trigger one after Accelerated trip signal tripping outlet open
Close, ground signalling disappears, EP (end of program)；
If S4-3. the second wheel route selection failure, repeat step S4-2 is until route selection is successful, and determines alternative circuit and connect for instantaneity
Earth fault or permanent earth fault；
S4-4. if the alternative circuit of N bars is not decided as faulty line, route selection failure.
Further, in the step S4-4, if route selection fails, entered by transformer station operator on duty with reference to operating experience
Row cuts jump operation in turn manually.
Above-described a kind of Small Electric Current Earthing And Routing Device round cut function test method, by being set in simulation model
Each circuit outlet switch is controllable and possesses automatic reclosing function, can realize the automatic of Small Electric Current Earthing And Routing Device round cut function
Test, method convenient and efficient.
In addition, the present invention also further sets outlet switch status indicator lamp in simulation model, outlet can be directly observed
The action situation of switch, outlet switch control word and the GTFPI boards control word one of power system Real Time Digital Simulator are set
Cause, quickly to receive the switch state of Small Electric Current Earthing And Routing Device feedback, while utilize power system real-timedigital simulation
Script controlling function editor control program in device, realizes different types of small current neutral grounding test simulation, applied widely.This
The method of invention greatly reduces the workload that work about electric power personnel test Small Electric Current Earthing And Routing Device round cut function, has wide
Wealthy popularizing application prospect.
Brief description of the drawings
Fig. 1 is the circuit diagram in a kind of Small Electric Current Earthing And Routing Device round cut function test method embodiment.
Fig. 2 is the structural representation of Small Electric Current Earthing And Routing Device round cut functional test platform.
Fig. 3 is the workflow diagram of step S4 in Small Electric Current Earthing And Routing Device round cut function test method embodiment.
Embodiment
Below with reference to specific embodiment, the invention will be further described, but protection scope of the present invention be not limited to it is following
Embodiment.
A kind of Small Electric Current Earthing And Routing Device round cut function automatic detection method, comprises the following steps：
S1. Small Electric Current Earthing And Routing Device round cut functional test platform is built, as shown in Fig. 2 including power system real-time digital
Emulator（RTDS）, power amplifier, the Small Electric Current Earthing And Routing Device for possessing round cut function；Power system real-timedigital simulation
Utensil has GTAO boards, GTFPI boards and RSCAD softwares, and GTAO boards are simulation output interface board, and GTFPI boards are
For On-off signal board, the input connection GTAO boards of power amplifier, output end connects the small electricity for possessing round cut function
The input of line-selected earthing device is flowed, the output end for possessing the Small Electric Current Earthing And Routing Device of round cut function connects with GTFPI boards
Connect；Wherein, power system Real Time Digital Simulator is to be used to emulate distribution system ground connection model, produces ground signalling, and controllable
The running situation of system switching state and observation system processed, power amplifier are to be used to amplify ground signalling to possessing round cut function
The available size of line selection device for low current, the line selection device for low current for possessing round cut function be for receive amplify after letter
Number, by analyzing signal, select the larger three-line of probability cut in turn jump and with power system real-time digital
Emulator interactive information.
S2. simulation model is built, is built and practical operation situation phase using the software of power system Real Time Digital Simulator
Near circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
Step S2 is specifically included：
S2-1. built in the DRAFT modules of RSCAD softwares with practical operation situation similar in circuit emulation model, with reference to figure
Shown in 1, the circuit outlet in circuit emulation model, which designs, comprises at least three class circuit emulation typess of models, i.e., pure overhead transmission line,
Pure cable run, aerial cable joint line, and above-mentioned three classes circuit emulation types of models outlet design set it is multiple can
Control is adjusted, adjustable control includes：A. the length scale of three class circuits sets adjustable control A；B. respectively in three class circuits
Stage casing, end earth fault is set, and the earthed switch of trouble point sets adjustable control B, the grounding resistance of trouble point
To can adjust control C；C. the outlet switch of every circuit sets a T delayed automatic reclosing function respectively.
S2-2. in the DRAFT modules in power system Real Time Digital Simulator RSCAD softwares, edit in simulation model
The different action sequences of switch, to set failure that moment and trouble duration occurs；
S2-3. in the RUNTIME modules in power system Real Time Digital Simulator RSCAD softwares, build and can adjust with described
Control A, adjustable control B, the corresponding control objects of adjustable control C, wherein, control object includes：Sliding block is set to adjust
The length of circuit, earth point grounding resistance size, settings button control the opening and closing of earthed switch and outlet switch, build outlet
On off state indicator lamp indicates the state of outlet switch, sets outlet switch control word and the GTFPI boards control word one
Show the quick switch state feedback for receiving Small Electric Current Earthing And Routing Device, build circuit residual voltage and zero-sequence current waveform
Figure control is to observe circuit Grounding.
S3. small current neutral grounding test event is selected, Small Electric Current Earthing And Routing Device is arranged in transformer station, outer outlet of standing
Running situation is complicated and changeable, is the Stability and veracity of test device, test event should include nature of trouble, failure occurs
Phase size and earth fault continue length when property, line harmonic content, the failure of position, circuit on circuit occur, right
Test event is combined selection, forms a plurality of circuit emulation model.
Wherein, nature of trouble is also contemplated that as metallic ground, arc grounding or high resistance ground.
In the RUNTIME modules of RSCAD softwares, according to selected test event, different Script controlling journeys is write
Sequence, the value size variation and switch motion for carrying out controllable object in continuous control simulation model change, and are specially：Design control is imitative
Control A, adjustable control B and adjustable control C value size variation are can adjust described in true mode and switch motion changes
Program, to realize different types of small current neutral grounding test simulation.And pass through the small electricity of RUNTIME module energy real-time monitored circuits
Flow under Grounding, the bus residual voltage of circuit and the dynamic change situation of Ge Lu outlet zero-sequence currents.
S4. when earth fault occurs for circuit, the GTAO boards of RTDS real-time simulators export bus residual voltage and gone out
Line zero sequence current signal to power amplifier carries out signal amplification, then inputs the signal after amplification to possessing round cut function
In Small Electric Current Earthing And Routing Device, possesses the letter of the Small Electric Current Earthing And Routing Device receiving power amplifier output of round cut function
Number, by analyzing signal, a preferred circuit, the wherein alternative circuit of N bars, N ＞ 1 are selected, then according to route selection order,
The trip signal for choosing circuit outlet switch is fed back to the GTFPI boards of power system Real Time Digital Simulator, RSCAD softwares
, to choosing circuit to carry out trip operation, possesses round cut function by corresponding outlet switch action in control circuit simulation model
Small Electric Current Earthing And Routing Device according to outlet switch trip result judge whether route selection correct.
In step S4, possess the Small Electric Current Earthing And Routing Device of round cut function according to route selection order, possess round cut function
The trip signal for choosing circuit outlet switch is fed back to power system Real Time Digital Simulator by Small Electric Current Earthing And Routing Device
GTFPI boards, RSCAD softwares are jumped by corresponding outlet switch action in control circuit simulation model to choosing circuit to carry out
Lock operates, and the Small Electric Current Earthing And Routing Device for possessing round cut function judges whether route selection is correct according to outlet switch tripping operation result
Detailed process includes：
S4-1. the Small Electric Current Earthing And Routing Device for possessing round cut function is delayed T1s tripping first choice lines after earth fault is experienced
Road outlet switch, the Small Electric Current Earthing And Routing Device for possessing round cut function can't detect earth fault, then judge the preferred line of this bar
Road is faulty line, and first choice success, outlet switch completes single shot reclosing operation by inherent delay T, in singlephase earth fault feelings
No longer tripping after condition lower switch single shot reclosing, if ground signalling disappears, for instantaneity earth fault, EP (end of program)；If tool
The Small Electric Current Earthing And Routing Device of standby round cut function remains to detect earth fault, then is permanent earth fault, line selection apparatus
Accelerated trip signal tripping outlet switch after triggering one, ground signalling disappear, EP (end of program)；
If S4-2. preferred failure, first alternative circuit outlet switch is jumped after line selection apparatus delay T1s, possesses round cut function
Small Electric Current Earthing And Routing Device can't detect earth fault, then judges that the alternative circuit of this is faulty line, the second wheel route selection into
Work(, outlet switch are completed single shot reclosing and operated, the no longer tripping after singlephase earth fault situation lower switch single shot reclosing, if
Ground signalling disappears, then is instantaneity earth fault, EP (end of program)；If possesses the Small Electric Current Earthing And Routing Device of round cut function still
Earth fault can be detected, then be permanent earth fault, line selection apparatus trigger one after Accelerated trip signal tripping outlet open
Close, ground signalling disappears, EP (end of program)；
If S4-3. the second wheel route selection failure, the alternative circuit outlet switch of Article 2 is jumped after line selection apparatus delay T1s, possesses round cut
The Small Electric Current Earthing And Routing Device of function can't detect earth fault, then judges that the alternative circuit of this is faulty line, third round
Route selection success, outlet switch complete single shot reclosing operation, after singlephase earth fault situation lower switch single shot reclosing no longer
Tripping, if ground signalling disappears, for instantaneity earth fault, EP (end of program)；If possesses the small current neutral grounding choosing of round cut function
Line apparatus is remained to detect earth fault, then is permanent earth fault, and Accelerated trip signal is jumped after line selection apparatus triggers one
Wiretap is outputed, ground signalling disappears, EP (end of program)；
If S4-4. 2 alternative circuits are not decided as faulty line, route selection failure, then route selection operation is no longer carried out, by becoming
Power station operator on duty combines operating experience and carries out cutting jump operation in turn manually.
According to the route selection strategy for the line-selected earthing device for possessing round cut function, the wheel by RTDS real-time simulators to device
Cut function to be tested, the method that emulation testing is more specifically illustrated below in conjunction with Fig. 1 and Fig. 3：
Set circuit L3 fault grounds, it is assumed that line selection apparatus according to location design select the higher three-line L2, L3 of probability,
L5, point three kinds of situations illustrate, and the first situation is preferred correct, then route selection order is L3, L2, L5, and second of situation is
Preferred incorrect, first alternative correct, then route selection order is L2, L3, L5, and the third situation is preferred incorrect, Article 2
Alternative correct, then route selection order is L2, L5, L3.The T1s that line selection apparatus delay sends trip signal is arranged to 5s.
（1）It is preferred correct.
The Small Electric Current Earthing And Routing Device for possessing round cut function judges that circuit L3 is faulty line, and L3 lines are exported after the 5s that is delayed
For the control signal of road outlet switch to GTFPI boards, GTFPI boards receive the small current earthing wire-selecting dress for possessing round cut function
After the control signal put, according to control word one-to-one principle, L3 line switchings in analogue system are controlled to trip, in RUNTIME
L3 circuit outlet switch position signalling lamps are can observe on interface to go out, and now possess the Small Electric Current Earthing And Routing Device of round cut function
The bus residual voltage U ' received0With outlet zero-sequence current I '01-I´05It is 0, then device judges this route selection success.Due to
L3 outlet switchs location status changes, and starts automatic reclosing, and triggering L3 line switchings after T delays overlaps, at RUNTIME interfaces
On to can observe L3 circuit outlet switch position signalling lamps bright, if the Small Electric Current Earthing And Routing Device for possessing round cut function receives
Bus residual voltage U '0With outlet zero-sequence current I '01-I´05It is 0, then terminates for instantaneity earth fault, route selection；If tool
The bus residual voltage U ' that the Small Electric Current Earthing And Routing Device of standby round cut function receives0With outlet zero-sequence current I '01-I´05
More than initiation value, then the Small Electric Current Earthing And Routing Device for possessing round cut function exports trip signal to GTFPI boards, switch immediately
Instantaneous trip, the Small Electric Current Earthing And Routing Device for now possessing round cut function can't detect fault-signal, and route selection terminates.
（2）Preferred incorrect, first alternative correct
The Small Electric Current Earthing And Routing Device for possessing round cut function judges that circuit L2 is faulty line, and output L2 circuits go out after the 5s that is delayed
For the control signal of wiretap to GTFPI boards, GTFPI boards receive the Small Electric Current Earthing And Routing Device that possesses round cut function
After control signal, according to control word one-to-one principle, L2 line switchings in analogue system are controlled to trip, at RUNTIME interfaces
On can observe L2 circuit outlet switch position signalling lamps and go out, the Small Electric Current Earthing And Routing Device for now possessing round cut function receives
The bus residual voltage U ' arrived0With outlet zero-sequence current I '01-I´05Still greater than initiation value, then device judges that this route selection fails.
Because L2 outlet switchs location status changes, start automatic reclosing, triggering L2 line switchings after T delays overlaps, in RUNTIME
It is bright that L2 circuit outlet switch position signallings are can observe on interface.
Possesses the Small Electric Current Earthing And Routing Device of the round cut function then alternative circuit L3 of round cut first in order, be delayed 5s
Control signal to GTFPI boards, the GTFPI boards for exporting L3 circuit outlet switchs afterwards receives the low current for possessing round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L3 line switchings in analogue system are controlled to trip,
It can observe L3 circuit outlet switch position signalling lamps on RUNTIME interfaces to go out, the low current for now possessing round cut function connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, then device judges this time to select
Line success.Because L3 outlet switchs location status changes, starting automatic reclosing, triggering L3 line switchings after T delays overlaps,
It can observe that L3 circuit outlet switch position signalling lamps are bright on RUNTIME interfaces, if possessing the small current neutral grounding choosing of round cut function
The bus residual voltage U ' that line apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, is then instantaneity earth fault, selects
Knot beam；If the bus residual voltage U ' that the Small Electric Current Earthing And Routing Device for possessing round cut function receives0With outlet zero sequence electricity
Flow I '01-I´05Initiation value is all higher than, then the Small Electric Current Earthing And Routing Device for possessing round cut function exports trip signal extremely immediately
GTFPI boards, instantaneous trip being switched, the Small Electric Current Earthing And Routing Device for now possessing round cut function can't detect fault-signal,
Route selection terminates.
（3）Preferred incorrect, Article 2 is alternatively correct
The Small Electric Current Earthing And Routing Device for possessing round cut function judges that circuit L2 is faulty line, and output L2 circuits go out after the 5s that is delayed
For the control signal of wiretap to GTFPI boards, GTFPI boards receive the Small Electric Current Earthing And Routing Device that possesses round cut function
After control signal, according to control word one-to-one principle, L2 line switchings in analogue system are controlled to trip, at RUNTIME interfaces
On can observe L2 circuit outlet switch position signalling lamps and go out, the Small Electric Current Earthing And Routing Device for now possessing round cut function receives
The bus residual voltage U ' arrived0With outlet zero-sequence current I '01-I´05Still greater than initiation value, then device judges that this route selection fails.
Because L2 outlet switchs location status changes, start automatic reclosing, triggering L2 line switchings after T delays overlaps, in RUNTIME
It is bright that L2 circuit outlet switch position signallings are can observe on interface.
Possesses the Small Electric Current Earthing And Routing Device of the round cut function then alternative circuit L5 of round cut first in order, be delayed 5s
Control signal to GTFPI boards, the GTFPI boards for exporting L5 circuit outlet switchs afterwards receives the low current for possessing round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L5 line switchings in analogue system are controlled to trip,
It can observe L5 circuit outlet switch position signalling lamps on RUNTIME interfaces to go out, the low current for now possessing round cut function connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05Still greater than initiation value, then device judgement
This time route selection failure.Because L5 outlet switchs location status changes, start automatic reclosing, L5 line switchings are triggered after T delays
Overlap, it is bright to can observe L5 circuit outlet switch position signallings on RUNTIME interfaces, possesses the small current neutral grounding of round cut function
The bus residual voltage U ' that line selection apparatus receives0With outlet zero-sequence current I '01-I´05Still greater than initiation value, because device judges to select
Then locking sends Accelerated trip semiotic function for line failure.
Possesses the Small Electric Current Earthing And Routing Device of the round cut function then alternative circuit L3 of round cut Article 2 in order, be delayed 5s
Control signal to GTFPI boards, the GTFPI boards for exporting L3 circuit outlet switchs afterwards receives the low current for possessing round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L3 line switchings in analogue system are controlled to trip,
It can observe L3 circuit outlet switch position signalling lamps on RUNTIME interfaces to go out, the low current for now possessing round cut function connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, then device judges this time to select
Line success.Because L3 outlet switchs location status changes, starting automatic reclosing, triggering L3 line switchings after T delays overlaps,
It can observe that L3 circuit outlet switch position signalling lamps are bright on RUNTIME interfaces, if possessing the small current neutral grounding choosing of round cut function
The bus residual voltage U ' that line apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, is then instantaneity earth fault, selects
Knot beam；If the bus residual voltage U ' that the Small Electric Current Earthing And Routing Device for possessing round cut function receives0With outlet zero sequence electricity
Flow I '01-I´05Initiation value is all higher than, then the Small Electric Current Earthing And Routing Device for possessing round cut function exports trip signal extremely immediately
GTFPI boards, instantaneous trip being switched, the Small Electric Current Earthing And Routing Device for now possessing round cut function can't detect fault-signal,
Route selection terminates.
（4）Three-line route selection is all unsuccessful
Possesses the bus zero sequence electricity that the Small Electric Current Earthing And Routing Device of round cut function remains to after round cut three-line receive respectively
Press U '0With outlet zero-sequence current I '01-I´05Initiation value is all higher than, then judges route selection failure, locking route selection function.
Claims (9)
1. a kind of Small Electric Current Earthing And Routing Device round cut function automatic detection method, it is characterised in that comprise the following steps：
S1. Small Electric Current Earthing And Routing Device round cut functional test platform, including power system Real Time Digital Simulator, power are built
Amplifier, the Small Electric Current Earthing And Routing Device for possessing round cut function；The power system Real Time Digital Simulator has GTAO plates
Card, GTFPI boards and RSCAD softwares, the input of the power amplifier connect the GTAO boards, described in output end connection
Possess the input of the Small Electric Current Earthing And Routing Device of round cut function, the Small Electric Current Earthing And Routing Device for possessing round cut function
Output end be connected with the GTFPI boards；
S2. build simulation model, using the software of power system Real Time Digital Simulator build with practical operation situation similar in
Circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
S3. small current neutral grounding test event is selected, test event includes nature of trouble, position on the line, line occur for failure
Phase size and earth fault continue length when property, line harmonic content, the failure on road occur, and different test events is entered
Initial conditions of the row combination to occur as failure, then in the RUNTIME modules of RSCAD softwares, set RSCAD software energy
The adjustable control of each bar circuit emulation model of continuous control；
S4. when earth fault occurs for circuit, the GTAO boards output bus residual voltage of RTDS real-time simulators and outlet zero
Sequence current signal to power amplifier carries out signal amplification, then inputs the signal after amplification to the small electricity for possessing round cut function
Flow in line-selected earthing device, possess the signal of the Small Electric Current Earthing And Routing Device receiving power amplifier output of round cut function, lead to
Cross and signal is analyzed, select a preferred circuit, the wherein alternative circuit of N bars, N ＞ 1, then according to route selection order, will select
The trip signal of middle circuit outlet switch feeds back to the GTFPI boards of power system Real Time Digital Simulator, and RSCAD softwares pass through
Corresponding outlet switch is acted to choosing circuit to carry out trip operation, to possess the small of round cut function in control circuit simulation model
Current earthing line selection apparatus judges whether route selection is correct according to outlet switch tripping operation result.
2. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 1, it is characterised in that：
The step S2 is specifically included：Circuit outlet design in circuit emulation model comprises at least three class circuit emulation model classes
Type, i.e., pure overhead transmission line, pure cable run, aerial cable joint line, and going out in above-mentioned three classes circuit emulation types of models
Line design sets multiple adjustable controls, and the adjustable control includes：A. the length scale of three class circuits sets adjustable control
Part A；B., earth fault is set in the stage casing of three class circuits, end respectively, and the earthed switch of trouble point sets adjustable control
Part B, the grounding resistance of trouble point is adjustable control C；C. the outlet switch of every circuit sets an automatic weight of T delays respectively
Closing function.
3. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 2, it is characterised in that：
The step S2 also includes：In DRAFT modules in power system Real Time Digital Simulator RSCAD softwares, Bian Jifang
The different action sequences of earthed switch in true mode, to set failure that moment and trouble duration occurs.
4. the Small Electric Current Earthing And Routing Device round cut function automatic detection method according to Claims 2 or 3, its feature exist
In：The step S2 also includes：In RUNTIME modules in power system Real Time Digital Simulator RSCAD softwares, build with
The adjustable control A, adjustable control B, the corresponding control objects of adjustable control C.
5. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 4, it is characterised in that：Institute
Stating control object includes：Set sliding block to come the length of adjusting circuit, earth point grounding resistance size, settings button to be grounded to control
The opening and closing of switch and outlet switch, build outlet switch status indicator lamp, outlet switch control word and the GTFPI boards are set
Control word is consistent, builds circuit residual voltage and zero-sequence current oscillogram control.
6. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 1, it is characterised in that：Institute
Stating nature of trouble includes metallic ground, arc grounding and high resistance ground.
7. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 2, it is characterised in that：Institute
State in step S3, in the RUNTIME modules of RSCAD softwares, set RSCAD softwares to automatically control each bar circuit emulation model
Adjustable control be specially：According to the test event of setting, in power system Real Time Digital Simulator RSCAD softwares
In RUNTIME modules, control A, adjustable control B and adjustable control C amount are can adjust described in design control simulation model
It is worth size variation and the program of switch motion change, and passes through RUNTIME module energy real-time monitored circuit small current neutral grounding situations
Under, the bus residual voltage of circuit and the dynamic change situation of Ge Lu outlet zero-sequence currents.
8. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 1, it is characterised in that：
In the step S4, possess the Small Electric Current Earthing And Routing Device of round cut function according to route selection order, circuit outlet will be chosen
The trip signal of switch feeds back to the GTFPI boards of power system Real Time Digital Simulator, and RSCAD softwares are imitated by control circuit
Corresponding outlet switch action is come to choosing circuit to carry out trip operation, the small current neutral grounding for possessing round cut function is selected in true mode
Line apparatus judges that the whether correct detailed process of route selection includes according to outlet switch tripping operation result：
S4-1. the Small Electric Current Earthing And Routing Device for possessing round cut function is delayed T1s tripping first choice lines after earth fault is experienced
Road outlet switch, the Small Electric Current Earthing And Routing Device for possessing round cut function can't detect earth fault, then judge the preferred line of this bar
Road is faulty line, and first choice success, outlet switch completes single shot reclosing operation by inherent delay T, in singlephase earth fault feelings
No longer tripping after condition lower switch single shot reclosing, if ground signalling disappears, for instantaneity earth fault, EP (end of program)；If tool
The Small Electric Current Earthing And Routing Device of standby round cut function remains to detect earth fault, then is permanent earth fault, line selection apparatus
Accelerated trip signal tripping outlet switch after triggering one, ground signalling disappear, EP (end of program)；
If S4-2. preferred failure, an alternative circuit outlet switch is jumped off after line selection apparatus delay T1s, possesses round cut function
Small Electric Current Earthing And Routing Device can't detect earth fault, then judges that the alternative circuit of this is faulty line, the second wheel route selection into
Work(, outlet switch are completed single shot reclosing and operated, the no longer tripping after singlephase earth fault situation lower switch single shot reclosing, if
Ground signalling disappears, then is instantaneity earth fault, EP (end of program)；If possesses the Small Electric Current Earthing And Routing Device of round cut function still
Earth fault can be detected, then be permanent earth fault, line selection apparatus trigger one after Accelerated trip signal tripping outlet open
Close, ground signalling disappears, EP (end of program)；
If S4-3. the second wheel route selection failure, repeat step S4-2 is until route selection is successful, and determines alternative circuit and connect for instantaneity
Earth fault or permanent earth fault；
S4-4. if the alternative circuit of N bars is not decided as faulty line, route selection failure.
9. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 8, it is characterised in that：
In the step S4-4, if route selection fails, operating experience is combined by transformer station operator on duty and carries out cutting jump in turn manually
Operation.
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| CN108562827A (en) * | 2018-03-13 | 2018-09-21 | 南方电网科学研究院有限责任公司 | A kind of small current earthing wire-selecting method and system |
| CN108983135A (en) * | 2018-05-17 | 2018-12-11 | 济南置真电气有限公司 | A method of for verifying low-current ground fault line selection algorithm accuracy rate |
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| CN113866677A (en) * | 2021-10-15 | 2021-12-31 | 贵州电网有限责任公司 | Ground fault removal correctness checking method based on SCADA data |
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| CN108562827A (en) * | 2018-03-13 | 2018-09-21 | 南方电网科学研究院有限责任公司 | A kind of small current earthing wire-selecting method and system |
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| CN108983137A (en) * | 2018-07-23 | 2018-12-11 | 济南置真电气有限公司 | A kind of system and method for detection single-phase earth fault line selection tripping round cut reliability |
| CN110161443A (en) * | 2019-05-16 | 2019-08-23 | 南方电网科学研究院有限责任公司 | A kind of small current earthing wire-selecting test device and its test method |
| CN110161443B (en) * | 2019-05-16 | 2021-08-03 | 南方电网科学研究院有限责任公司 | Low-current grounding line selection testing device and testing method thereof |
| CN112180205A (en) * | 2020-08-28 | 2021-01-05 | 南京国电南自软件工程有限公司 | Intelligent distributed single-phase grounding line selection method and system for power distribution network |
| CN112180205B (en) * | 2020-08-28 | 2024-05-28 | 南京国电南自软件工程有限公司 | Intelligent distributed single-phase grounding line selection method and system for power distribution network |
| CN112736869A (en) * | 2020-12-23 | 2021-04-30 | 贵州电网有限责任公司 | Fault alternate switching method of low-current grounding line selection device |
| CN112736869B (en) * | 2020-12-23 | 2023-05-23 | 贵州电网有限责任公司 | Fault round cutting method of low-current grounding line selection device |
| CN113866677A (en) * | 2021-10-15 | 2021-12-31 | 贵州电网有限责任公司 | Ground fault removal correctness checking method based on SCADA data |
| CN113866677B (en) * | 2021-10-15 | 2024-04-05 | 贵州电网有限责任公司 | SCADA data-based ground fault removal correctness checking method |
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