CN104251978A - Tester for affection of alternating-current crosstalk and voltage fluctuation of direct-current system on relay - Google Patents

Tester for affection of alternating-current crosstalk and voltage fluctuation of direct-current system on relay Download PDF

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Publication number
CN104251978A
CN104251978A CN201410449206.2A CN201410449206A CN104251978A CN 104251978 A CN104251978 A CN 104251978A CN 201410449206 A CN201410449206 A CN 201410449206A CN 104251978 A CN104251978 A CN 104251978A
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China
Prior art keywords
resistance
output circuit
current
relay
terminal
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CN201410449206.2A
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CN104251978B (en
Inventor
徐强超
黄晶晶
林浩明
李永祥
吴文健
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GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO Ltd
Guangzhou Power Supply Bureau Co Ltd
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GUANGZHOU QIANSHUN ELECTRONIC EQUIPMENT CO Ltd
Guangzhou Power Supply Bureau Co Ltd
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Publication of CN104251978A publication Critical patent/CN104251978A/en
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Abstract

The invention relates to a tester for the affection of alternating-current crosstalk and voltage fluctuation of a direct-current system on a relay, which comprises an alternating-current output circuit, a system capacitance output circuit and a resistance output circuit; one output terminal of the alternating-current output circuit is connected between the relay to be tested and the cathode of the direct-current system, and the other terminal of the alternating-current output circuit is connected is earthed; one output terminal of the system capacitance output circuit is connected between the anode of the direct-current system and the relay to be tested, and the other output terminal of the system capacitance output circuit is earthed; one output terminal of the resistance output circuit is connected between the relay to be tested and the cathode of the direct-current system, and the other output terminal of the resistance output circuit is earthed. Under various faults such as alternating current getting into direct current and voltage fluctuation of the direct-current system, the tester makes possible the visual and accurate research of the characteristics of protectors. When the tester is adopted to test different models of relays to be tested, the affection of different insulation states on the protective characteristics of the relays can be visually and accurately analyzed according to test data, so that the safety of system operation can be enhanced. Meanwhile, the invention can put forward suggestions for improvement for conventional insulation monitors in order to enhance the reliability of power grid operation.

Description

The proving installation that straight-flow system interchange crosstalk and voltage fluctuation affect relay
Technical field
The present invention relates to substation relay protection technical field, particularly relate to a kind of straight-flow system and exchange the proving installation that crosstalk and voltage fluctuation affect relay.
Background technology
When secondary circuit generation one point earth causes voltage deviation; or when straight-flow system causes DC bus voltage-to-ground to fluctuate larger; or when the ratio of straight-flow system negative pole voltage-to-ground and positive pole voltage-to-ground is more than or equal to 1.2222; under system capacitance effect, easily cause the relay misoperation of protective device to do; fault is hidden; be unfavorable for fast finding and the recovery of fault, bring great pressure to on-the-spot defect processing work, there is potential safety hazard.
When secondary circuit generation AC-DC interference; consequence is relatively serious; after generation, be not only crosstalk point, especially an interference at full station; accident can be caused from the weakest place; such as easily cause the relay misoperation work etc. of protective device, fault is hidden, is unfavorable for fast finding and the recovery of fault; bring great pressure to on-the-spot defect processing work, there is potential safety hazard.
Summary of the invention
Based on this, be necessary for the problems referred to above, the proving installation that the interchange crosstalk of a kind of straight-flow system and voltage fluctuation affect relay is provided, according to the various earth fault of this proving installation analog DC system, pass through analyzing test data, find out potential fault fast and revise, improving the security of system cloud gray model.
Straight-flow system exchanges the proving installation that crosstalk and voltage fluctuation affect relay, comprise that a lead-out terminal is connected between relay to be measured with straight-flow system negative pole, another lead-out terminal ground connection exchange output circuit; One lead-out terminal is connected between straight-flow system positive pole and described relay to be measured, the system capacitance output circuit of another lead-out terminal ground connection; One lead-out terminal is connected between described relay to be measured and straight-flow system negative pole, the electric resistance output circuit of another lead-out terminal ground connection.
The proving installation that straight-flow system interchange crosstalk of the present invention and voltage fluctuation affect relay; by exchanging the analog AC crosstalk of output circuit output AC source to the impact of relay; adjustable capacitor test system distributed capacitance is exported on the impact of relay by system capacitance output circuit; by the impact of different analog DC system voltage fluctuations on relay of electric resistance output circuit output resistance; under the various faults such as the AC in the DC, straight-flow system voltage fluctuation, the characteristic of accurately research protective device directly perceived is made to become possibility.The to be measured relay of this proving installation to different model is adopted to test; the impact of different insulative state on relay protection characteristic can be analyzed intuitively, exactly according to test data; thus find out trouble spot fast according to analysis result and revise; reduce the probability that DC earthing etc. may cause false protection, improve the security of system cloud gray model.The data simultaneously can tested according to this proving installation, propose recommendation on improvement to the insulation monitoring and warning device of the straight-flow system of transformer station in existing operation, improve operation of power networks reliability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of proving installation embodiment of the present invention;
Fig. 2 is the schematic diagram that the present invention exchanges output circuit embodiment;
Fig. 3 is the schematic diagram of present system capacitive output circuit embodiment;
Fig. 4 is the schematic diagram of electric resistance output circuit embodiment of the present invention;
Fig. 5 is the schematic diagram of the guidance panel embodiment of full-scale test stage apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, straight-flow system interchange crosstalk of the present invention and the embodiment of voltage fluctuation on the proving installation that relay affects are described in detail.
As shown in Figure 1, a kind of straight-flow system exchanges the proving installation that crosstalk and voltage fluctuation affect relay, comprise that a lead-out terminal is connected between relay 140 to be measured with straight-flow system negative pole-KM, another lead-out terminal ground connection exchange output circuit 120; One lead-out terminal is connected between straight-flow system positive pole+KM and described relay to be measured 140, the system capacitance output circuit 110 of another lead-out terminal ground connection; One lead-out terminal is connected between described relay to be measured 140 and straight-flow system negative pole-KM, the electric resistance output circuit 130 of another lead-out terminal ground connection.
The alternating current source exchanging output circuit 120 output uses as crosstalk sources.As shown in Figure 2, exchange output circuit 120 and can comprise the pressure regulator 121, isolating transformer 122, the air switch 123 that are connected successively with voltage input end.When air switch 123 closes, the voltage of voltage input end input is successively through pressure regulator 121, isolating transformer 122, and output AC seals in the isolation alternating voltage needed for DC simulation experiment.Such as, the civil power of voltage input end input AC220V (volt) ± 10%, then the alternating voltage of 0-250V is exported through pressure regulator 121, the alternating voltage exported exports the isolation alternating voltage of 0-500V again through 1:2 isolating transformer 122, when air switch 123 closes, the isolation alternating voltage that isolating transformer 122 exports is for test.
System capacitance output circuit 110 exports adjustable electric capacity, and during for studying the AC in the DC, system distributed capacitance is on the impact etc. of relay.As shown in Figure 3, the circuit in each dotted line frame is one group of capacitor loop, and system capacitance output circuit 110 comprises at least one group of capacitor loop, for exporting the electric capacity of different value.Each capacitor loop structure is identical, all comprises current-limiting resistance 111, discharge resistance 112, by-pass switch 114, load capacitance 113, and the load capacitance value of each capacitor loop is generally unequal.Such as, system capacitance output circuit 110 shown in Fig. 3 comprises 8 groups of condenser networks, the capacitance of the load capacitance of 8 groups of capacitor loops is respectively 1 μ F (microfarad), 2 μ F, 3 μ F, 4 μ F, 10 μ F, 20 μ F, 30 μ F, 40 μ F, select different capacitor loop combinations, minimum 1 μ F can be exported, the electric capacity of the highest 110 μ F.
As shown in Figure 3, the current-limiting resistance 111 of capacitor loop and load capacitance 113 are connected between two lead-out terminals of capacitor loop after connecting; 1 connecting terminals of by-pass switch 114 is connected between current-limiting resistance 111 and load capacitance 113, and 2 terminals are connected with a lead-out terminal of capacitor loop, and 3 terminals are connected with another lead-out terminal of capacitor loop by discharge resistance 112.When not needing to use system capacitance output circuit 110,1 terminal of by-pass switch 114 connects 3 terminals, and the energy storage electricity of proof load electric capacity 113 is 0; When preparing access test loop and testing, 1 terminal of by-pass switch 114 mediates, and current-limiting resistance 111 drops into test loop, ensures wiring moment no-spark; After wiring completes, 1 terminal of by-pass switch 114 connects 2 terminals, bypasses current-limiting resistance 114, and warranty test loop only has load capacitance 113 to exist.
Electric resistance output circuit 130 is for exporting the resistance of different resistance, and analog DC system voltage fluctuates, and comprises at least one resistance loop.Each resistance loop structure is identical, comprises resistance and selector switch.After each resistance is connected with corresponding selector switch, be connected between two lead-out terminals at described resistance loop two ends.As shown in Figure 4, circuit in each dotted line frame is one group of resistance loop, electric resistance output circuit 130 comprises two groups of resistance loops, each resistance loop comprises the resistance 131 of 6 different resistances, be respectively 5k Ω (kilo-ohm), 10k Ω, 20k Ω, 30k Ω, 50k Ω, 100k Ω, opening and the closed size determining output resistance of selector switch 132, each resistance loop two ends are respectively arranged with two lead-out terminals, conveniently expand output connection.The resistance loop that resistance output loop 130 comprises, the quantity of resistance and resistance value, output terminal subnumber etc. are not restricted to the quantity shown in Fig. 4 and numerical value, can also be other parameter.
As shown in Figure 5, for the test platform device of the entity according to Fig. 2-Fig. 4 circuit realiration, system capacitance output circuit 110, interchange output circuit 120, electric resistance output circuit 130 are arranged in a cabinet by this test platform device, when needs analog AC seals in direct current or straight-flow system voltage fluctuation, required output circuit is only needed to connect according to Fig. 1, namely multi-group data test can be realized, accurately convenient.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (7)

1. straight-flow system exchanges the proving installation that crosstalk and voltage fluctuation affect relay, it is characterized in that, comprise that a lead-out terminal is connected between relay to be measured with straight-flow system negative pole, another lead-out terminal ground connection exchange output circuit; One lead-out terminal is connected between straight-flow system positive pole and described relay to be measured, the system capacitance output circuit of another lead-out terminal ground connection; One lead-out terminal is connected between described relay to be measured and straight-flow system negative pole, the electric resistance output circuit of another lead-out terminal ground connection.
2. straight-flow system according to claim 1 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, and it is characterized in that, described interchange output circuit comprises the pressure regulator, isolating transformer, the air switch that are connected successively with voltage input end.
3. straight-flow system according to claim 1 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, it is characterized in that, described system capacitance output circuit comprises capacitor loop, and described capacitor loop comprises current-limiting resistance, discharge resistance, by-pass switch, load capacitance; Described current-limiting resistance and described load capacitance are connected between two lead-out terminals of described capacitor loop after connecting; Described by-pass switch the first terminal is connected between described current-limiting resistance and described load capacitance, and the second terminal is connected with a lead-out terminal of described capacitor loop, and the 3rd terminal is connected with another lead-out terminal of described capacitor loop by discharge resistance.
4. straight-flow system according to claim 3 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, it is characterized in that, described system capacitance output circuit comprises 8 groups of capacitor loops, and the capacitance of the load capacitance of 8 groups of capacitor loops is respectively 1 μ F, 2 μ F, 3 μ F, 4 μ F, 10 μ F, 20 μ F, 30 μ F, 40 μ F.
5. straight-flow system according to claim 1 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, and it is characterized in that, described electric resistance output circuit comprises resistance loop, and described resistance loop comprises resistance and selector switch; After each resistance is connected with corresponding selector switch, be connected between two lead-out terminals at described resistance loop two ends.
6. straight-flow system according to claim 5 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, it is characterized in that, described electric resistance output circuit comprises 2 groups of resistance loops, often organize the resistance that resistance loop comprises 6 different resistances, wherein the resistance of 6 resistance is 5k Ω, 10k Ω, 20k Ω, 30k Ω, 50k Ω, 100k Ω.
7. straight-flow system according to claim 5 exchanges the proving installation that crosstalk and voltage fluctuation affect relay, and it is characterized in that, each described resistance loop two ends are respectively arranged with two lead-out terminals.
CN201410449206.2A 2014-09-04 2014-09-04 Straight-flow system exchanges the test device that crosstalk and voltage pulsation influence on relay Active CN104251978B (en)

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CN108983030A (en) * 2018-08-29 2018-12-11 国网辽宁省电力有限公司丹东供电公司 A kind of fault locator and method of the AC in the DC system based on round cut resistance
CN111077397A (en) * 2019-12-30 2020-04-28 国家电网有限公司 Detection and early warning system for grounding crosstalk of power transformation direct current system

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CN111077397B (en) * 2019-12-30 2022-03-08 国家电网有限公司 Detection and early warning system for grounding crosstalk of power transformation direct current system

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