CN107783070B - 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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- CN107783070B CN107783070B CN201710979064.4A CN201710979064A CN107783070B CN 107783070 B CN107783070 B CN 107783070B CN 201710979064 A CN201710979064 A CN 201710979064A CN 107783070 B CN107783070 B CN 107783070B
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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
Abstract
The invention discloses a kind of Small Electric Current Earthing And Routing Device round cut function test methods, including electric system Real Time Digital Simulator, power amplifier, the Small Electric Current Earthing And Routing Device for having round cut function.RTDS real-time simulator generates ground signalling, and ground signalling is amplified to the Small Electric Current Earthing And Routing Device for having round cut function by power amplifier, the Small Electric Current Earthing And Routing Device for having round cut function receives amplified signal, by analyzing signal, it selects the biggish N route of probability and is cut jump in turn, then trip signal is fed back to the GTFPI board of electric system Real Time Digital Simulator, by corresponding outlet switch movement in control route simulation model come to choosing route to carry out trip operation, the Small Electric Current Earthing And Routing Device for having round cut function judges whether route selection is correct according to outlet switch tripping result.The overall process of test is automatically controlled by RSCAD software and is executed, and realizes the automatic control of test process.
Description
Technical field
The invention belongs to electric system route selection functional test technical fields, and in particular to a kind of Small Electric Current Earthing And Routing Device wheel
Cut function test method.
Background technique
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 grid
The capacitance current of route is flowed only through when barrier, at ground fault, numerical value is several peaces to two, 30 peaces, due to not generating short circuit
Electric current, and line voltage is still symmetrically, not influence the normal power supply to user, allow to continue to run 1~2 by regulatory requirements small
When.At this point, non-faulting phase-to-ground voltage rises to line voltage level, it may cause its weakness generation of insulating and puncture over the ground, thus
Single-phase earthing once occurs for fault spread, the power distribution network especially based on cable, cable, multiple exhibition be 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 when ground fault occurs for system in time, 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 networks to run needs the performance of test device qualified before, and simple test method is
The voltage and current 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 reflect line selection apparatus for high resistance ground, arcing ground etc.
The action behavior of complex situations.And can be built in RTDS real-time simulator and run actual model close to system, it is preferable to reflect
Voltage characteristic amount under various Groundings, at the same can control failure occur at the time of, instant observation system operating condition, is small
The excellent tool of Current Alignment Device test.
Existing grid company requires the preferred accuracy of Small Electric Current Earthing And Routing Device to be 90% 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 simulator, but current line selection apparatus
Majority is equipped with wheel cutting method in algorithm, to prevent that can also be improved by cutting jumping circuit in turn automatically twice in preferred unsuccessful situation
The correctness of route selection.However not yet it is related to the small electricity for having round cut function in current Small Electric Current Earthing And Routing Device test
Flow line-selected earthing device test method.
Summary of the invention
The present invention provides a kind of Small Electric Current Earthing And Routing Device round cut function test method, this method is able to achieve low current
The automatic test of line-selected earthing device round cut function reduces work about electric power personnel and tests Small Electric Current Earthing And Routing Device round cut function
The workload of energy.
A kind of Small Electric Current Earthing And Routing Device round cut function automatic detection method, comprising the following steps:
S1. Small Electric Current Earthing And Routing Device round cut functional test platform is built, including electric system Real Time Digital Simulator,
Power amplifier, the Small Electric Current Earthing And Routing Device for having round cut function；The electric system Real Time Digital Simulator has
GTAO board, GTFPI board and RSCAD software, the input terminal of the power amplifier connect the GTAO board, and output end connects
Connect the input terminal of the Small Electric Current Earthing And Routing Device for having round cut function, the small current neutral grounding choosing for having round cut function
The output end of line apparatus is connect with the GTFPI board；
S2. simulation model is built, is built and practical operation situation phase using the software of electric system Real Time Digital Simulator
Close circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
S3. small current neutral grounding test item is selected, test item includes nature of trouble, the position of failure generation on the line
Set, the property of route, line harmonic content, failure occur when phase size and ground fault continue length, to different tests
Project is combined the initial conditions to occur as failure, and then in the RUNTIME module of RSCAD software, RSCAD is arranged
The adjustable control of each circuit emulation model of software energy continuous control；
S4. when ground fault occurs for route, the GTAO board of RTDS real-time simulator exports bus residual voltage and goes out
Line zero sequence current signal to power amplifier carries out signal amplification, is then input to amplified signal and has round cut function
In Small Electric Current Earthing And Routing Device, the Small Electric Current Earthing And Routing Device for having round cut function receives the letter of power amplifier output
Number, by analyzing signal, preferred a route, the alternative route of N item are selected, wherein N > 1, then according to route selection sequence,
The trip signal for choosing route outlet switch is fed back to the GTFPI board of electric system Real Time Digital Simulator, RSCAD software
, to choosing route to carry out trip operation, has round cut function by outlet switch movement corresponding in control route simulation model
Small Electric Current Earthing And Routing Device according to outlet switch trip result judge whether route selection correct.
Further, the step S2 is specifically included: the route outlet design in circuit emulation model includes at least three classes
Circuit emulation types of models, i.e., pure overhead transmission line, pure cable run, aerial cable joint line, and it is imitative in above-mentioned three classes route
Multiple adjustable controls are arranged in the outlet design of true mode type, and the adjustable control includes: a. that the length of three classes route is big
It is small that adjustable control A is set；B. earth fault is set in the middle section of three classes route, end respectively, and the ground connection of fault point is opened
It closes and adjustable control B is set, the ground resistance of fault point is adjustable control C；C. the outlet switch of every route is respectively set
T delayed automatic reclosing function.
Further, the step S2 further include: the DRAFT in electric system Real Time Digital Simulator RSCAD software
In module, the different action sequences of earthing switch in simulation model are edited, moment and trouble duration occurs failure is arranged.
Further, the step S2 further include: in electric system Real Time Digital Simulator RSCAD software
In RUNTIME module, control object corresponding with the adjustable control A, adjustable control B, adjustable control C is built.It is excellent
Choosing, the control object includes: that setting sliding block comes the length of adjusting circuit, grounding point ground resistance size, setting button
Control earthing switch and outlet switch opening and closing, build outlet switch status indicator lamp, setting outlet switch control word with it is described
GTFPI board control word is consistent, builds route residual voltage and zero-sequence current waveform diagram control.
Further, the nature of trouble includes metallic ground, arc grounding and high resistance ground.
Further, in the step S3, in the RUNTIME module of RSCAD software, setting RSCAD software can be automatic
Control the adjustable control of each circuit emulation model specifically: according to the test item of setting, in electric system real-time digital
In the RUNTIME module of emulator RSCAD software, design can be adjusted control A described in continuous control simulation model, be adjusted
The program that the variation of the magnitude size of control B and adjustable control C and switch motion change, and can be in real time by RUNTIME module
It observes in the case of route small current neutral grounding, the bus residual voltage of route and the dynamic changes of Ge Lu outlet zero-sequence current.
Further, in the step S4, has the Small Electric Current Earthing And Routing Device of round cut function according to route selection sequence, tool
It is real-time that the trip signal for choosing route outlet switch is fed back to electric system by the Small Electric Current Earthing And Routing Device of standby round cut function
The GTFPI board of digital simulator, RSCAD software is by outlet switch movement corresponding in control route simulation model come to choosing
Middle route carries out trip operation, has the Small Electric Current Earthing And Routing Device of round cut function according to outlet switch tripping result judgement choosing
The whether correct detailed process of line includes:
S4-1. be delayed after the experiencing ground fault T1s tripping of Small Electric Current Earthing And Routing Device for having round cut function is first
Route selection road outlet switch, the Small Electric Current Earthing And Routing Device for having round cut function can't detect ground fault, then determine this head
Route selection road is faulty line, and preferred success, outlet switch completes single shot reclosing operation by inherent delay T, in single-phase earthing event
No longer tripping after barrier situation lower switch single shot reclosing, if ground signalling disappears, for instantaneity ground fault, EP (end of program)；
If the Small Electric Current Earthing And Routing Device for having round cut function remains to detect ground fault, for permanent earth fault, route selection
Accelerated trip signal tripping outlet switch after device triggers one, ground signalling disappear, EP (end of program)；
If S4-2. preferred failure, an alternative route outlet switch is jumped off after line selection apparatus delay T1s, has round cut function
The Small Electric Current Earthing And Routing Device of energy can't detect ground fault, then determines that the alternative route of this is faulty line, the second polling
Line success, outlet switch are completed single shot reclosing operation, are no longer jumped after singlephase earth fault situation lower switch single shot reclosing
It opens, if ground signalling disappears, for instantaneity ground fault, EP (end of program)；If the small current earthing wire-selecting for having round cut function
Device remains to detect ground fault, then is permanent earth fault, Accelerated trip signal tripping after line selection apparatus triggers one
Outlet switch, ground signalling disappear, EP (end of program)；
If S4-3. the second wheel route selection failure, repeats step S4-2 until route selection is successful, and it is instantaneous for determining alternative route
Property ground fault or permanent earth fault；
If S4-4. the alternative route of N item is not judged as faulty line, route selection failure.
Further, in the step S4-4, if route selection fail, by substation operator on duty combine operating experience into
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 arranged in simulation model
Each route outlet switch is controllable and has automatic reclosing function, is able to achieve the automatic of Small Electric Current Earthing And Routing Device round cut function
Test, method convenient and efficient.
In addition, outlet switch status indicator lamp is also further arranged in the present invention in simulation model, outlet can be directly observed
The GTFPI board control word one of outlet switch control word and electric system Real Time Digital Simulator is arranged in the action situation of switch
It causes, quickly to receive the switch state feedback of Small Electric Current Earthing And Routing Device, while utilizing electric 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 popularization and application foreground.
Detailed description of the invention
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 schematic diagram of Small Electric Current Earthing And Routing Device round cut functional test platform.
Fig. 3 is the work flow diagram of step S4 in Small Electric Current Earthing And Routing Device round cut function test method embodiment.
Specific 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, comprising the following steps:
S1. Small Electric Current Earthing And Routing Device round cut functional test platform is built, as shown in Fig. 2, including that electric system is real-time
Digital simulator (RTDS), power amplifier, the Small Electric Current Earthing And Routing Device for having round cut function；Electric system real-time digital
Emulator has GTAO board, GTFPI board and RSCAD software, and GTAO board is simulation output interface board, GTFPI plate
Card is On-off signal board, and the input terminal of power amplifier connects GTAO board, and output end connection has round cut function
The input terminal of Small Electric Current Earthing And Routing Device has the output end and GTFPI plate of the Small Electric Current Earthing And Routing Device of round cut function
Card connection；Wherein, electric system Real Time Digital Simulator is to be grounded model for emulating distribution system, generates ground signalling, and
The operating condition of controllable system switching state and observation system, power amplifier are for amplifying ground signalling to having round cut
The available size of the line selection device for low current of function, the line selection device for low current for having round cut function is for after receiving amplification
Signal select the biggish three-line of probability and cut jump and real-time with electric system in turn by analyzing signal
Digital simulator interactive information.
S2. simulation model is built, is built and practical operation situation phase using the software of electric system Real Time Digital Simulator
Close circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
Step S2 is specifically included:
S2-1. it is built in the DRAFT module of RSCAD software and circuit emulation model similar in practical operation situation, knot
It closes the route outlet design shown in Fig. 1, in circuit emulation model and includes at least three classes circuit emulation types of models, i.e., pure overhead line
Road, pure cable run, aerial cable joint line, and it is multiple in the outlet of above-mentioned three classes circuit emulation types of models design setting
Adjustable control, adjustable control include: a. that adjustable control A is arranged in the length scale of three classes route；B. respectively in three classes line
Earth fault is arranged in middle section, the end on road, and adjustable control B, the ground connection electricity of fault point is arranged in the earthing switch of fault point
Resistance is adjustable control C；C. a T delayed automatic reclosing function is respectively set in the outlet switch of every route.
S2-2. it in the DRAFT module in electric system Real Time Digital Simulator RSCAD software, edits in simulation model
Failure is arranged moment and trouble duration occur for the different action sequences of switch；
S2-3. in the RUNTIME module in electric system Real Time Digital Simulator RSCAD software, build with it is described can
Adjust control A, adjustable control B, the adjustable corresponding control object of control C, wherein control object includes: setting sliding block
Grounding point ground resistance size, button is arranged to control the opening and closing of earthing switch and outlet switch, build in the length of adjusting circuit
Outlet switch status indicator lamp controls to indicate the state of outlet switch, outlet switch control word is arranged with the GTFPI board
Word one, which is shown, quickly to be received the switch state feedback of Small Electric Current Earthing And Routing Device, builds route residual voltage and zero-sequence current
Waveform diagram control is to observe route Grounding.
S3. small current neutral grounding test item is selected, Small Electric Current Earthing And Routing Device is mounted in substation, outer outlet of standing
Operating condition is complicated and changeable, is the Stability and veracity of test device, and test item should occur to exist including nature of trouble, failure
Phase size and ground fault continue length when property, line harmonic content, the failure of position, route on route occur, right
Test item 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 module of RSCAD software, according to selected test item, different Script controlling journeys is write
Sequence, the magnitude size variation and switch motion for carrying out controllable object in continuous control simulation model change, specifically: design control is imitative
Control A, the magnitude size variation of adjustable control B and adjustable control C and switch motion are adjusted described in true mode to change
Program, to realize different types of small current neutral grounding test simulation.And the small electricity of route can be observed by RUNTIME module in real time
It flows under Grounding, the bus residual voltage of route and the dynamic changes of Ge Lu outlet zero-sequence current.
S4. when ground fault occurs for route, the GTAO board of RTDS real-time simulator exports bus residual voltage and goes out
Line zero sequence current signal to power amplifier carries out signal amplification, is then input to amplified signal and has round cut function
In Small Electric Current Earthing And Routing Device, the Small Electric Current Earthing And Routing Device for having round cut function receives the letter of power amplifier output
Number, by analyzing signal, preferred a route, the alternative route of N item are selected, wherein N > 1, then according to route selection sequence,
The trip signal for choosing route outlet switch is fed back to the GTFPI board of electric system Real Time Digital Simulator, RSCAD software
, to choosing route to carry out trip operation, has round cut function by outlet switch movement corresponding in control route simulation model
Small Electric Current Earthing And Routing Device according to outlet switch trip result judge whether route selection correct.
In step S4, has the Small Electric Current Earthing And Routing Device of round cut function according to route selection sequence, have round cut function
The trip signal for choosing route outlet switch is fed back to electric system Real Time Digital Simulator by Small Electric Current Earthing And Routing Device
GTFPI board, RSCAD software are jumped by corresponding outlet switch movement in control route simulation model to choosing route to carry out
Lock operation, the Small Electric Current Earthing And Routing Device for having round cut function judge whether route selection is correct according to outlet switch tripping result
Detailed process includes:
S4-1. be delayed after the experiencing ground fault T1s tripping of Small Electric Current Earthing And Routing Device for having round cut function is first
Route selection road outlet switch, the Small Electric Current Earthing And Routing Device for having round cut function can't detect ground fault, then determine this head
Route selection road is faulty line, and preferred success, outlet switch completes single shot reclosing operation by inherent delay T, in single-phase earthing event
No longer tripping after barrier situation lower switch single shot reclosing, if ground signalling disappears, for instantaneity ground fault, EP (end of program)；
If the Small Electric Current Earthing And Routing Device for having round cut function remains to detect ground fault, for permanent earth fault, route selection
Accelerated trip signal tripping outlet switch after device triggers one, ground signalling disappear, EP (end of program)；
If S4-2. preferred failure, first alternative route outlet switch is jumped after line selection apparatus delay T1s, has round cut function
The Small Electric Current Earthing And Routing Device of energy can't detect ground fault, then determines that the alternative route of this is faulty line, the second polling
Line success, outlet switch are completed single shot reclosing operation, are no longer jumped after singlephase earth fault situation lower switch single shot reclosing
It opens, if ground signalling disappears, for instantaneity ground fault, EP (end of program)；If the small current earthing wire-selecting for having round cut function
Device remains to detect ground fault, then is permanent earth fault, Accelerated trip signal tripping after line selection apparatus triggers one
Outlet switch, ground signalling disappear, EP (end of program)；
If S4-3. the second wheel route selection failure, the alternative route outlet switch of Article 2 is jumped after line selection apparatus delay T1s, is had
The Small Electric Current Earthing And Routing Device of round cut function can't detect ground fault, then determines that the alternative route of this is faulty line, the
Three-wheel route selection success, outlet switch completes single shot reclosing operation, after singlephase earth fault situation lower switch single shot reclosing
No longer tripping, if ground signalling disappears, for instantaneity ground fault, EP (end of program)；If the low current for having round cut function connects
Ground line selection apparatus remains to detect ground fault, then is permanent earth fault, and Accelerated trip is believed after line selection apparatus triggers one
Number tripping outlet switch, ground signalling disappear, EP (end of program)；
If S4-4. 2 alternative routes are not judged as faulty line, route selection failure then no longer carries out route selection operation,
Operating experience is combined to carry out cutting jump operation in turn manually by substation operator on duty.
According to the route selection strategy for the line-selected earthing device for having round cut function, by RTDS real-time simulator to the wheel of device
It cuts function to be tested, the method for more specifically illustrating emulation testing below in conjunction with Fig. 1 and Fig. 3:
Set route L3 fault ground, it is assumed that line selection apparatus according to location design select the higher three-line L2 of probability,
L3, L5, point three kinds of situations are illustrated, the first situation is that first choice is correct, then route selection sequence is L3, L2, L5, second situation
It is that first choice is incorrect, first is alternative correct, then route selection sequence is L2, L3, L5, the third situation is that first choice is incorrect, and second
Item is alternatively correct, then route selection sequence is L2, L5, L3.The T1s that line selection apparatus delay sends trip signal is set as 5s.
(1) preferred correct.
The Small Electric Current Earthing And Routing Device for having round cut function determines that route L3 is faulty line, exports L3 line after the 5s that is delayed
For the control signal of road outlet switch to GTFPI board, GTFPI board receives the small current earthing wire-selecting dress for having round cut function
After the control signal set, according to control word one-to-one principle, L3 line switching tripping in analogue system is controlled, in RUNTIME
It can observe L3 route outlet switch position signal lamp on interface to go out, have the Small Electric Current Earthing And Routing Device of round cut function at this time
The bus residual voltage U ' received0With outlet zero-sequence current I '01-I´05It is 0, then device determines this route selection success.Due to
L3 outlet switch location status changes, and starts automatic reclosing, triggering L3 line switching is overlapped after T delay, at the interface RUNTIME
On to can observe L3 route outlet switch position signal lamp bright, if the Small Electric Current Earthing And Routing Device for having round cut function receives
Bus residual voltage U '0With outlet zero-sequence current I '01-I´05It is 0, then is instantaneity ground fault, route selection terminates；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
Greater than initiation value, then the Small Electric Current Earthing And Routing Device for having round cut function exports trip signal to GTFPI board, switch immediately
Instantaneous trip, the Small Electric Current Earthing And Routing Device for having round cut function at this time can't detect fault-signal, and route selection terminates.
(2) preferred incorrect, first alternative correct
The Small Electric Current Earthing And Routing Device for having round cut function determines that route L2 is faulty line, exports L2 line after the 5s that is delayed
For the control signal of road outlet switch to GTFPI board, GTFPI board receives the small current earthing wire-selecting dress for having round cut function
After the control signal set, according to control word one-to-one principle, L2 line switching tripping in analogue system is controlled, in RUNTIME
It can observe L2 route outlet switch position signal lamp on interface to go out, have the Small Electric Current Earthing And Routing Device of round cut function at this time
The bus residual voltage U ' received0With outlet zero-sequence current I '01-I´05It is still greater than initiation value, then device determines that this route selection is lost
It loses.Since L2 outlet switch location status changes, start automatic reclosing, triggering L2 line switching is overlapped after T delay, In
It is bright to can observe L2 route outlet switch position signal on the interface RUNTIME.
Have the Small Electric Current Earthing And Routing Device of round cut function then round cut first alternative route L3 in order, be delayed 5s
The control signal of L3 route outlet switch is exported afterwards to GTFPI board, and GTFPI board receives the low current for having round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L3 line switching tripping in analogue system is controlled,
It can observe L3 route outlet switch position signal lamp on the interface RUNTIME to go out, the low current for having round cut function at this time connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, then device determines this time to select
Line success.Since L3 outlet switch location status changes, start automatic reclosing, triggering L3 line switching is overlapped after T delay, In
It can observe that L3 route outlet switch position signal lamp is bright on the interface RUNTIME, if having 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 ground fault, selects
Knot beam；If the bus residual voltage U ' that the Small Electric Current Earthing And Routing Device for having round cut function receives0With outlet zero sequence electricity
Flow I '01-I´05It is all larger than initiation value, then the Small Electric Current Earthing And Routing Device for having round cut function exports trip signal extremely immediately
GTFPI board switchs instantaneous trip, and the Small Electric Current Earthing And Routing Device for having round cut function at this time 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 having round cut function determines that route L2 is faulty line, exports L2 line after the 5s that is delayed
For the control signal of road outlet switch to GTFPI board, GTFPI board receives the small current earthing wire-selecting dress for having round cut function
After the control signal set, according to control word one-to-one principle, L2 line switching tripping in analogue system is controlled, in RUNTIME
It can observe L2 route outlet switch position signal lamp on interface to go out, have the Small Electric Current Earthing And Routing Device of round cut function at this time
The bus residual voltage U ' received0With outlet zero-sequence current I '01-I´05It is still greater than initiation value, then device determines that this route selection is lost
It loses.Since L2 outlet switch location status changes, start automatic reclosing, triggering L2 line switching is overlapped after T delay, In
It is bright to can observe L2 route outlet switch position signal on the interface RUNTIME.
Have the Small Electric Current Earthing And Routing Device of round cut function then round cut first alternative route L5 in order, be delayed 5s
The control signal of L5 route outlet switch is exported afterwards to GTFPI board, and GTFPI board receives the low current for having round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L5 line switching tripping in analogue system is controlled,
It can observe L5 route outlet switch position signal lamp on the interface RUNTIME to go out, the low current for having round cut function at this time connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05It is still greater than initiation value, then device determines
This time route selection failure.Since L5 outlet switch location status changes, starts automatic reclosing, trigger L5 line switching after T delay
It is overlapped, it is bright to can observe L5 route outlet switch position signal on the interface RUNTIME, has 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´05It is still greater than initiation value, because device determines to select
Line failure, which is then latched, sends Accelerated trip semiotic function.
Has the Small Electric Current Earthing And Routing Device of the round cut function then alternative route L3 of round cut Article 2 in order, be delayed 5s
The control signal of L3 route outlet switch is exported afterwards to GTFPI board, and GTFPI board receives the low current for having round cut function
After the control signal of line-selected earthing device, according to control word one-to-one principle, L3 line switching tripping in analogue system is controlled,
It can observe L3 route outlet switch position signal lamp on the interface RUNTIME to go out, the low current for having round cut function at this time connects
The bus residual voltage U ' that ground line selection apparatus receives0With outlet zero-sequence current I '01-I´05It is 0, then device determines this time to select
Line success.Since L3 outlet switch location status changes, start automatic reclosing, triggering L3 line switching is overlapped after T delay, In
It can observe that L3 route outlet switch position signal lamp is bright on the interface RUNTIME, if having 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 ground fault, selects
Knot beam；If the bus residual voltage U ' that the Small Electric Current Earthing And Routing Device for having round cut function receives0With outlet zero sequence electricity
Flow I '01-I´05It is all larger than initiation value, then the Small Electric Current Earthing And Routing Device for having round cut function exports trip signal extremely immediately
GTFPI board switchs instantaneous trip, and the Small Electric Current Earthing And Routing Device for having round cut function at this time can't detect fault-signal,
Route selection terminates.
(4) three-line route selection is all unsuccessful
Have the Small Electric Current Earthing And Routing Device of round cut function and remains to the bus zero received after round cut three-line respectively
Sequence voltage U '0With outlet zero-sequence current I '01-I´05It is all larger than initiation value, then determines that route selection fails, is latched route selection function.
Claims (8)
1. a kind of Small Electric Current Earthing And Routing Device round cut function automatic detection method, it is characterised in that the following steps are included:
S1. Small Electric Current Earthing And Routing Device round cut functional test platform, including electric system Real Time Digital Simulator, power are built
Amplifier, the Small Electric Current Earthing And Routing Device for having round cut function；The electric system Real Time Digital Simulator has GTAO plate
Card, GTFPI board and RSCAD software, the input terminal of the power amplifier connect the GTAO board, described in output end connection
Have the input terminal of the Small Electric Current Earthing And Routing Device of round cut function, the Small Electric Current Earthing And Routing Device for having round cut function
Output end connect with the GTFPI board；
S2. build simulation model, using the software of electric system Real Time Digital Simulator build with similar in practical operation situation
Circuit emulation model, the outlet of the circuit emulation model are provided with multiple adjustable controls；
S3. small current neutral grounding test item is selected, test item includes that position on the line, line occur for nature of trouble, failure
Phase size and ground fault continue length when the property on road, line harmonic content, failure occur, to different test items into
RSCAD software energy is arranged then in the RUNTIME module of RSCAD software in initial conditions of the row combination to occur as failure
The adjustable control of each circuit emulation model of continuous control；
S4. when ground fault occurs for route, the GTAO board output bus residual voltage of RTDS real-time simulator and outlet zero
Sequence current signal to power amplifier carries out signal amplification, then amplified signal is input to the small electricity for having round cut function
It flows in line-selected earthing device, the Small Electric Current Earthing And Routing Device for having round cut function receives the signal of power amplifier output, leads to
It crosses and signal is analyzed, select preferred a route, the alternative route of N item, wherein N > 1 will be selected then according to route selection sequence
The trip signal of middle route outlet switch feeds back to the GTFPI board of electric system Real Time Digital Simulator, and RSCAD software passes through
Corresponding outlet switch acts to have the small of round cut function to choosing route to carry out trip operation in control route simulation model
Current earthing line selection apparatus judges whether route selection is correct according to outlet switch tripping result, and detailed process includes:
S4-1. the Small Electric Current Earthing And Routing Device for having round cut function is delayed T1s tripping first choice line after experiencing ground fault
Road outlet switch, the Small Electric Current Earthing And Routing Device for having round cut function can't detect ground fault, then determine 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 ground fault, EP (end of program)；If tool
The Small Electric Current Earthing And Routing Device of standby round cut function remains to detect ground 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 route outlet switch is jumped off after line selection apparatus delay T1s, has round cut function
Small Electric Current Earthing And Routing Device can't detect ground fault, then determines that the alternative route of this is faulty line, the second wheel route selection at
Function, outlet switch are completed single shot reclosing and are operated, the no longer tripping after singlephase earth fault situation lower switch single shot reclosing, if
Ground signalling disappears, then is instantaneity ground fault, EP (end of program)；If having the Small Electric Current Earthing And Routing Device of round cut function still
It can detect ground fault, then be permanent earth fault, Accelerated trip signal tripping outlet is opened after line selection apparatus triggers one
It closes, ground signalling disappears, EP (end of program)；
If S4-3. the second wheel route selection failure, repeats step S4-2 until route selection is successful, and determines alternative route and connect for instantaneity
Earth fault or permanent earth fault；
If S4-4. the alternative route of N item is not judged as faulty line, route selection failure.
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: the route outlet design in circuit emulation model includes at least three classes circuit emulation model class
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
Multiple adjustable controls are arranged in line design, and the adjustable control includes: a. the adjustable control of length scale setting of three classes route
Part A；B. earth fault, and the adjustable control of earthing switch setting of fault point are set in the middle section of three classes route, end respectively
Part B, the ground resistance of fault point are adjustable control C；C. the automatic weight of T delay is respectively set in the outlet switch of every route
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 further include: in the DRAFT module in electric system Real Time Digital Simulator RSCAD software, Bian Jifang
Failure is arranged moment and trouble duration occur for the different action sequences of earthing switch in true mode.
4. Small Electric Current Earthing And Routing Device round cut function automatic detection method according to claim 2 or 3, feature exist
In the step S2 further include: in the RUNTIME module in electric system Real Time Digital Simulator RSCAD software, build with
The adjustable control A, adjustable control B, the adjustable corresponding control object of 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: that setting sliding block comes the length of adjusting circuit, grounding point ground resistance size, setting button to control ground connection
Outlet switch status indicator lamp, setting outlet switch control word and the GTFPI board are built in the opening and closing of switch and outlet switch
Control word is consistent, builds route residual voltage and zero-sequence current waveform diagram 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
It states in step S3, in the RUNTIME module of RSCAD software, setting RSCAD software can automatically control each circuit emulation model
Adjustable control specifically: according to the test item of setting, in electric system Real Time Digital Simulator RSCAD software
In RUNTIME module, the amount of control A, adjustable control B and adjustable control C are adjusted described in design control simulation model
It is worth the program of size variation and switch motion change, and route small current neutral grounding situation can be observed by RUNTIME module in real time
Under, the bus residual voltage of route and the dynamic changes of Ge Lu outlet zero-sequence current.
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 S4-4, if route selection fails, operating experience is combined to carry out cutting jump in turn manually by substation operator on duty
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 |
| 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 |
| 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 |
| 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 |
| 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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