CN104914391A - Distribution network single-phase grounding fault simulation and positioning performance test platform and method - Google Patents
Distribution network single-phase grounding fault simulation and positioning performance test platform and method Download PDFInfo
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- CN104914391A CN104914391A CN201510224745.0A CN201510224745A CN104914391A CN 104914391 A CN104914391 A CN 104914391A CN 201510224745 A CN201510224745 A CN 201510224745A CN 104914391 A CN104914391 A CN 104914391A
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Abstract
The invention discloses a distribution network single-phase grounding fault simulation and positioning performance test platform and a method. One end of a first isolating knife switch is connected with a line, the other end of the first isolating knife switch is connected with one end of a first circuit breaker, the other end of the first circuit breaker is connected with one end of a graded and adjustable high-power resistor, the other end of the graded and adjustable high-power resistor is connected with one end of a second circuit breaker, and the other end of the second circuit breaker is grounded through an insulating conductor. One end of a second isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the second isolating knife switch is connected with one end of a gas discharge gap, and the other end of the gas discharge gap is grounded through the insulating conductor. One end of a third isolating knife switch is connected with the other end of the graded and adjustable high-power resistor, the other end of the third isolating knife switch is connected with one end of a controllable arc discharge device, and the other end of the controllable arc discharge device is grounded through the insulating conductor. By controlling the first circuit breaker, the second circuit breaker and the graded and adjustable resistor, simulation of line single-phase grounding is realized.
Description
Technical field
The invention belongs to large scale electrical power unit fault detection technique field, be specifically related to a kind of one-phase earthing failure in electric distribution network analogue test platform.
Background technology
China's MV distribution systems is mainly non-direct ground system, i.e. isolated neutral system or neutral by arc extinction coil grounding system.After such system generation singlephase earth fault, fault current is very little, so need not trip immediately.Especially when occur transient single-phase earth fault time, short dot can voluntarily arc extinguishing recover insulation, do not need operations staff to take what measure, this for minimizing user in short-term frequency of power cut have positive effect.
Operation 1 ~ 2 hour can be continued after regulations stipulate generation singlephase earth fault, in reality due to superpotential may cause electric cable explosion, the accident such as PT burns, bus burns, Power Plant stoppage in transit, so faulty line must be found out as early as possible.But fault current is very little, from very large measuring amount, extract fault current more difficult, add in system and there is a large amount of undesired signals, make the identification of faulty line and non-fault line become very difficult.
For a long time, operations staff adopts " bracing wire method " to solve failure line selection problem.This method complex operation, takes time and effort, and can say without any robotization.The appearance of microcomputer single-phase grounding selecting/distance measuring equipment, drastically increases the automatization level of distribution substation.Along with going deep into route selection/range measurement principle research, the continuous progress of apparatus design, increasing single-phase grounding selecting/distance measuring equipment drops into distribution substation and runs.At present, various earthing wire-selecting/distance-finding method based on steady-state component and transient state component should be able to realize the differentiation of faulty line theoretically, but due to the impact of many factors in practical application, easily be disturbed as fault information characteristics extracts, do not carry out appropriate message configuration for dissimilar earth fault, high resistant or arc-earth faults acquisition of information are comparatively difficult, cause the accuracy of line selection apparatus not high.Unavoidable problem is just become to the performance test of single-phase grounding selecting/distance measuring equipment.
But, also do not have a kind of reliably for method and the experimental facilities of the performance test of single-phase grounding selecting/distance measuring equipment at present.
Summary of the invention
A kind of one-phase earthing failure in electric distribution network is the object of the present invention is to provide to simulate and positioning performance test platform and method, to realize the simulation of various singlephase earth fault and the performance test for single-phase grounding selecting/distance measuring equipment.
For achieving the above object, the present invention is by the following technical solutions:
A kind of one-phase earthing failure in electric distribution network simulation and positioning performance test platform, comprise the first isolation switch, the first isolating switch, high-power resistance, the second isolating switch, the second isolation switch, the 3rd isolation switch, gas discharge gap and controlled arc discharge device that stepping is adjustable; One end of first isolation switch is by insulated conductor and band electrical bonding gold utensil connection line, the other end of the first isolation switch connects one end of the first isolating switch, one end of first isolating switch connects one end of the adjustable high-power resistance of stepping, the other end of the high-power resistance that stepping is adjustable connects one end of the second isolating switch, and the other end of the second isolating switch is by insulated conductor ground connection; One end of second isolation switch connects the other end of the adjustable high-power resistance of stepping, and the other end connects gas discharge gap one end, and the gas discharge gap other end is by insulated conductor ground connection; One end of 3rd isolation switch connects the other end of the adjustable high-power resistance of stepping, and the other end connects controlled arc discharge device one end, and the controlled arc discharge device other end is by insulated conductor ground connection.
Preferably, current transformer, voltage transformer (VT), protective device, controller and signal gathering unit is also comprised; For the input end of the output terminal connection signal collecting unit of the current transformer and voltage transformer (VT) that gather electric current and voltage on the circuit between the output terminal of the first isolation switch and the input end of the first isolating switch, the output terminal of signal gathering unit connects the input end of protective relaying device and the input end of controller; The output terminal of protective device is connected the control end of the first isolating switch, the control end of the second isolating switch, the second isolation switch and the 3rd isolation switch with the output terminal of controller.
Preferably, the dielectric strength range of adjustment of gas discharge gap is 0-100kV.
Preferably, the resistance value of the high-power resistance that stepping is adjustable is 0-1M ohm, and step-length is 0-0.1M ohm.
Preferably, controlled arc discharge device dielectric strength range of adjustment is 0-100kV.
Preferably, fuse is provided with between the first isolation switch and circuit.
A kind of one-phase earthing failure in electric distribution network simulation and positioning performance method of testing, it is characterized in that, comprise the following steps: first control the first breaker closing, the resistance value controlling the adjustable high-power resistance of stepping is 0 and the second isolation switch is closed a floodgate to drop into gas discharge gap simulation arc discharge, the second breaker closing is controlled after of short duration time delay, bypass gas discharging gap extinguish arcs, simulate the phenomenon of final direct metal ground connection.
A kind of one-phase earthing failure in electric distribution network simulation and positioning performance method of testing, comprise the following steps: control the first breaker closing, and make the 3rd isolation switch combined floodgate drop into controlled arc discharge device, make electric current after the high-power resistance that stepping is adjustable through controlled arc discharge unit simulation intermittent arc grounding phenomenon, then the controlled arc discharge device of the second breaker closing bypass is controlled, simulation non-metal earthing phenomenon.
Preferably, after the phenomenon or non-metal earthing phenomenon of simulation metallic earthing, in 20ms, control the first isolating switch disconnect, make earthing test device depart from feeder line, simulation instantaneity single-phase earthing phenomenon.
Compared with prior art, the present invention has following beneficial effect:
The invention provides the simulation of a kind of one-phase earthing failure in electric distribution network and positioning performance test platform and method, with realize various singlephase earth fault simulation and for the method for the performance test of single-phase grounding selecting/distance measuring equipment and experiment porch.This test platform can simulate various metallic earthing, non-metal earthing, and the time of ground connection, size of current are all adjustable.Can various electric discharge phenomena such as various ground wire and conductive contact, wire land, insulator creeping discharge, branch short in simulating reality, in order to detect the performance of single-phase grounding selecting/distance measuring equipment.At present, also relevant report and similar equipment is not also had both at home and abroad.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of one-phase earthing failure in electric distribution network simulation of the present invention and positioning performance test platform;
Fig. 2 is metallic earthing simulation test wiring diagram;
Fig. 3 is non-metal earthing simulation test wiring diagram.
Embodiment
Refer to shown in Fig. 1; a kind of one-phase earthing failure in electric distribution network simulation of the present invention and positioning performance test platform; comprise: fuse 1, first isolation switch 2, current transformer 3, first isolating switch 4, high-power resistance 6 (resistance value is 0-1M ohm, and step-length is 0-0.1M ohm), the second isolating switch 7, second isolation switch 8, the 3rd isolation switch 9, gas discharge gap 10, controlled arc discharge device 11, protective device 13, controller 14 and signal gathering unit 15 that stepping is adjustable.The dielectric strength of gas discharge gap 10 can regulate, and is 0-100kV.Controlled arc discharge device 11 can simulate multiple arc grounding phenomenon by different optimum configurations, and dielectric strength can regulate, and is 0-100kV.
One end of fuse 1 is by insulated conductor 16 and band electrical bonding gold utensil 17 connection line, the other end connects one end of the first isolation switch 2, the other end of the first isolation switch 2 connects one end of the first isolating switch 4, the other end of the first isolating switch 4 connects one end of the adjustable high-power resistance 6 of stepping, the other end of the high-power resistance 6 that stepping is adjustable connects one end of the second isolating switch 7, and the other end of the second isolating switch 7 is by insulated conductor 12 ground connection; One end of second isolation switch 8 connects the other end of the adjustable high-power resistance 6 of stepping, and the other end connects gas discharge gap 10 one end, and gas discharge gap 10 other end is by insulated conductor 12 ground connection; One end of 3rd isolation switch 9 connects the other end of the adjustable high-power resistance 6 of stepping, and the other end connects controlled arc discharge device 11 one end, and controlled arc discharge device 11 other end is by insulated conductor 12 ground connection.
For the input end of the output terminal connection signal collecting unit 15 of the current transformer 3 and voltage transformer (VT) 5 that gather electric current and voltage on the circuit between the output terminal of the first isolation switch 2 and the input end of the first isolating switch 4, the output terminal of signal gathering unit 15 connects the input end of protective device 13 and the input end of controller 14; The output terminal of protective device 13 is connected the control end of the first isolating switch 4, the control end of the second isolating switch 7, the second isolation switch 8 and the 3rd isolation switch 9 with the output terminal of controller 14.
Insulated conductor 16, by band electrical bonding gold utensil 17, snaps in a phase of circuit by the present invention, by controlling the first isolating switch 4, second isolating switch 7 and the adjustable high-power resistance 6 of stepping, realizes the simulation to circuit single-phase earthing.Simulation is divided into the simulation of metallic earthing phenomenon and the simulation of non-metal earthing.Respectively in the simulation of the several diverse location of circuit, test single-phase earthing device to the judgement of this simulated failure and location simultaneously.
A kind of one-phase earthing failure in electric distribution network simulation of the present invention and positioning performance method of testing, comprise following a few part:
1) simulation of metallic earthing phenomenon and positioning performance method of testing
Take method shown in Fig. 2 to simulate practical conductor and encounter the device housings of ground connection as Single Phase Metal grounding phenomenons such as transformer tank shells.Gas discharge gap 10 is in order to produce arc phenomenon, and the conductor that stake resistance resistance is very little is simulated.During test, first the first isolation switch 2 and control the first isolating switch 4 are closed a floodgate, and make the second isolation switch 8 combined floodgate input gas discharge gap 10 simulate arc discharge, control the second isolating switch 7 after of short duration time delay to close a floodgate, bypass gas discharging gap extinguish arcs, simulate the phenomenon of final direct metal ground connection.
Utilize this device generation metallic earthing phenomenon at the scene, start single-phase earthing positioning system, observe its positioning result, thus the single-phase earthing positioning performance under test metallic earthing condition.
2) simulation of non-metal earthing and positioning performance method of testing
Non-metal earthing is through the ground connection of crossing resistance, and be generally attended by unstable intermittent electric arc, the simulation of intermittent arc grounding is the gordian technique to non-metal earthing phenomena simulation.Research approach is: develop controlled arc discharge device, realizes the control of the arcing to arc discharge, blow-out duration, interval time and discharge time, can produce lasting arc discharge, also can produce interval arc light electric discharge phenomena.Take method shown in Fig. 3 to simulate actual wire under wind-force effect, touch the intermittent arc grounding situation that branch etc. causes arcing, blow-out.
During test, control the first isolation switch 2 and control the first isolating switch 4 to close a floodgate, and make the 3rd isolation switch 9 combined floodgate drop into controlled arc discharge device 11, electric current is made to simulate intermittent arc grounding phenomenon through controlled arc discharge device 11 after the high-power resistance 6 (stake resistance stepping between 0 ~ 1M Ω is adjustable) that stepping is adjustable, for high resistance ground, then control the second isolating switch 7 and to close a floodgate the controlled arc discharge device 11 of bypass.
Utilize this device generation intermittent arc grounding phenomenon at the scene, start single-phase earthing positioning system, observe its positioning result, thus the single-phase earthing positioning performance under test intermittent arc grounding condition.
3) analogy method of instantaneity single-phase earthing phenomenon
After simulating the single-phase earthing phenomenon of metallicity/non-metal earthing according to the method described above, in 20ms, control the first isolating switch 4 by controller 14 disconnect, make earthing test device depart from feeder line, simulation instantaneity single-phase earthing phenomenon.
Claims (9)
1. an one-phase earthing failure in electric distribution network simulation and positioning performance test platform, it is characterized in that, comprise the first isolation switch (2), the first isolating switch (4), high-power resistance (6), the second isolating switch (7), the second isolation switch (8), the 3rd isolation switch (9), gas discharge gap (10) and controlled arc discharge device (11) that stepping is adjustable;
One end of first isolation switch (2) is by insulated conductor and band electrical bonding gold utensil connection line, the other end of the first isolation switch (2) connects one end of the first isolating switch (4), one end of first isolating switch (4) connects one end of the adjustable high-power resistance (6) of stepping, the other end of the high-power resistance (6) that stepping is adjustable connects one end of the second isolating switch (7), and the other end of the second isolating switch (7) is by insulated conductor ground connection;
One end of second isolation switch (8) connects the other end of the adjustable high-power resistance (6) of stepping, the other end connects gas discharge gap (10) one end, and gas discharge gap (10) other end is by insulated conductor ground connection;
One end of 3rd isolation switch (9) connects the other end of the adjustable high-power resistance (6) of stepping, the other end connects controlled arc discharge device (11) one end, and controlled arc discharge device (11) other end is by insulated conductor ground connection.
2. a kind of one-phase earthing failure in electric distribution network simulation according to claim 1 and positioning performance test platform, it is characterized in that, also comprise current transformer (3), voltage transformer (VT) (5), protective device (13), controller (14) and signal gathering unit (15); For the input end of the output terminal connection signal collecting unit (15) of the current transformer (3) and voltage transformer (VT) (5) that gather electric current and voltage on the circuit between the output terminal of the first isolation switch (2) and the input end of the first isolating switch (4), the output terminal of signal gathering unit (15) connects the input end of protective relaying device (13) and the input end of controller (14); The output terminal of protective device (13) is connected the control end of the first isolating switch (4), the control end of the second isolating switch (7), the second isolation switch (8) and the 3rd isolation switch (9) with the output terminal of controller (14).
3. a kind of one-phase earthing failure in electric distribution network simulation according to claim 1 and positioning performance test platform, it is characterized in that, the dielectric strength range of adjustment of gas discharge gap (10) is 0-100kV.
4. a kind of one-phase earthing failure in electric distribution network simulation according to claim 1 and positioning performance test platform, it is characterized in that, the resistance value of the high-power resistance (6) that stepping is adjustable is 0-1M ohm, and step-length is 0-0.1M ohm.
5. a kind of one-phase earthing failure in electric distribution network simulation according to claim 1 and positioning performance test platform, it is characterized in that, controlled arc discharge device (11) dielectric strength range of adjustment is 0-100kV.
6. a kind of one-phase earthing failure in electric distribution network simulation according to claim 1 and positioning performance test platform, is characterized in that, be provided with fuse (1) between the first isolation switch (2) and circuit.
7. an one-phase earthing failure in electric distribution network simulation and positioning performance method of testing, it is characterized in that, based on the one-phase earthing failure in electric distribution network simulation according to any one of claim 1 to 6 and positioning performance test platform, comprise the following steps: first control the first isolating switch (4) and close a floodgate, the resistance value controlling the adjustable high-power resistance (6) of stepping is 0 and the second isolation switch (8) is closed a floodgate to drop into gas discharge gap (10) simulation arc discharge, control the second isolating switch (7) after of short duration time delay to close a floodgate, bypass gas discharging gap extinguish arcs, simulate the phenomenon of final direct metal ground connection.
8. an one-phase earthing failure in electric distribution network simulation and positioning performance method of testing, it is characterized in that, based on the one-phase earthing failure in electric distribution network simulation according to any one of claim 1 to 6 and positioning performance test platform, comprise the following steps: control the first isolating switch (4) and close a floodgate, and make the 3rd isolation switch (9) combined floodgate drop into controlled arc discharge device (11), make electric current after the high-power resistance (6) that stepping is adjustable through controlled arc discharge device (11) simulation intermittent arc grounding phenomenon, then the controlled arc discharge device (11) of the second isolating switch (7) combined floodgate bypass is controlled, simulation non-metal earthing phenomenon.
9. a kind of one-phase earthing failure in electric distribution network simulation according to claim 7 or 8 and positioning performance method of testing, it is characterized in that, after the phenomenon or non-metal earthing phenomenon of simulation metallic earthing, in 20ms, control the first isolating switch (4) disconnect, earthing test device is made to depart from feeder line, simulation instantaneity single-phase earthing phenomenon.
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| CN107024921A (en) * | 2017-04-24 | 2017-08-08 | 中车大连电力牵引研发中心有限公司 | MVB failure simulation device |
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| CN109444788A (en) * | 2018-12-25 | 2019-03-08 | 李勇 | A kind of test platform and control method for power distribution network single phase grounding test |
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| CN111707904A (en) * | 2020-06-17 | 2020-09-25 | 华中科技大学 | Distribution network physical simulation experiment system with arc light grounding variable structure |
| CN112051485A (en) * | 2020-09-11 | 2020-12-08 | 广东电网有限责任公司电力科学研究院 | Intelligent ground fault simulation device and method for overhead line and terminal equipment |
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