CN104111433A - Device for detecting motion performances of earth fault indicator - Google Patents
Device for detecting motion performances of earth fault indicator Download PDFInfo
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- CN104111433A CN104111433A CN201410338066.1A CN201410338066A CN104111433A CN 104111433 A CN104111433 A CN 104111433A CN 201410338066 A CN201410338066 A CN 201410338066A CN 104111433 A CN104111433 A CN 104111433A
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- fault indicator
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Abstract
The invention provides a device for detecting motion performances of an earth fault indicator and belongs to the field of electric power distribution systems. The device comprises a current generation portion and a voltage generation portion. According to a structure of the current generation portion, a power supply V is connected with a voltage regulator T1 through a switch K1, a capacitor is connected with the voltage regulator T1 through a switch K2, an insulation cable is connected with the capacitor through a switch K3, and a resistor R and an inductor L are sequentially connected between the switch K3 and the insulation cable. According to a structure of the voltage generation portion, the power supply V is connected with a voltage regulator T2 through switches T4 and T5 and subsequently connected with a voltage booster, and the voltage booster is connected with an iron plate with good electrical conductivity. The earth fault indicator is installed on the insulation cable, the iron plate is vertically installed right below the fault indicator, and a certain distance is reserved between the iron plate and the fault indicator. According to the device for detecting motion performances of the earth fault indicator, the device is rapid in operation during a detection process and high in accuracy.
Description
Technical field
The present invention relates to distribution network failure pointer detection technical field, particularly relate to a kind of pick-up unit of earth-fault indicator performance.
Background technology
Fault detector is applied in power distribution network, the portion that can detect in real time at distribution line normally moves state recklessly, and short circuit or the earth fault of fast detecting and location circuit, help the quick isolated fault section of related personnel, keep in repair, reduce power off time and power failure range.Therefore fault detector system is widely used in China.
In order to guarantee that fault detector can precision maneuver when the line failure, before putting into operation, must detect the performance of fault detector.But owing to being a difficult problem to the location of singlephase earth fault at present always, so the detection principle of earth-fault indicator also differs widely, properties of product are very different.Therefore the performance of earth-fault indicator is detected accurately and reliably and also still belongs to a difficult problem.
Fault detector to be checked is installed on the circuit of actual distribution and detects, need the coordination of each power department, time and effort consuming, and be subject to the safety of electric system, the restriction of economical operation.
Summary of the invention
A pick-up unit for earth-fault indicator performance, the present invention is characterised in that, the structure of described pick-up unit is divided into two parts: part and voltage generation part occur electric current; Described electric current generating unit separation structure is as follows: power supply V is connected with pressure regulator T1 by K switch 1, capacitor is connected with pressure regulator T1 by K switch 2, insulated cable is connected with capacitor by K switch 3, is sequentially connected with resistance R and inductance L between K switch 3 and insulated cable; Described voltage generating unit separation structure is as follows: power supply V is connected with pressure regulator T2 by K switch 4, K5, then is connected with stepup transformer, and stepup transformer is connected with an iron plate with electric conductivity; Earth-fault indicator is arranged on described insulated cable, described iron plate be vertically mounted on described earth-fault indicator under, and be provided with spacing distance.
Electric current of the present invention occurs and voltage generation two parts do not have the connection on electric;
There is part and produce transient oscillation electric current by capacitor discharge in described electric current, simulates the fault current while there is earth fault;
There is part by being added in the voltage on conduction iron plate in described voltage, simulates the voltage-to-ground while breaking down.
K switch 5 of the present invention is single-pole double-throw switch (SPDT), adopts contact (1,2) to change the voltage of above-mentioned pressure regulator T2 output.
Capacitor of the present invention is adjustable condenser, and described resistance R is adjustable resistance, and described inductance L is controllable impedance, and the height H of the iron plate of described electric conductivity can regulate.The present invention adopts the voltage of the fault detector induction conduction iron plate being arranged on insulated cable.
Electric current generation part of the present invention, by pressure regulator, T1 is charged to after certain numerical value to capacitor, then by resistance R, inductance L loop discharge generation transient oscillation electric current, flows through insulated cable, simulates the fault current while there is earth fault.
Voltage generation part of the present invention, meets the requirements of magnitude of voltage by regulating pressure regulator T2 and stepup transformer to make to conduct electricity iron plate, and the make contact that changes single-pole double-throw switch (SPDT) K5 is simulated the variation of the voltage-to-ground before and after breaking down.
Adjustable condenser of the present invention, adjustable resistance R, controllable impedance L, can, by these three elements are regulated, change the size of the oscillating current of output.
The fault detector being arranged on insulated cable of the present invention, does the judgement of being out of order, the indication of then reporting to the police by detecting the curent change in loop with the change in voltage of induction conduction iron plate.
Compared with prior art, the invention has the beneficial effects as follows:
(1) this structure of the detecting device is simple, does not need to adopt microsystem, digital-to-analogue conversion and power amplifying part etc., just can produce fault signature electric current, voltage waveform;
(2) this pick-up unit testing process is simple to operate, quick, accuracy rate is high.
Accompanying drawing explanation
Fig. 1 is the present invention's wiring schematic diagram in an embodiment;
Fig. 2 is the fault current oscillogram that the present invention simulates in an embodiment;
Fig. 3 is the false voltage oscillogram that the present invention simulates in an embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
The present embodiment structural representation as shown in Figure 1, a kind of pick-up unit of earth-fault indicator performance, the present invention is characterised in that, the structure of described pick-up unit is divided into two parts: part and voltage generation part occur electric current; Described electric current generating unit separation structure is as follows: power supply V is connected with pressure regulator T1 by K switch 1, capacitor is connected with pressure regulator T1 by K switch 2, insulated cable is connected with capacitor by K switch 3, is sequentially connected with resistance R and inductance L between K switch 3 and insulated cable; Described voltage generating unit separation structure is as follows: power supply V is connected with pressure regulator T2 by K switch 4, K5, then is connected with stepup transformer, and stepup transformer is connected with an iron plate with electric conductivity; Earth-fault indicator is arranged on described insulated cable, described iron plate be vertically mounted on described earth-fault indicator under, and be provided with spacing distance.
Electric current of the present invention occurs and voltage generation two parts do not have the connection on electric;
There is part and produce transient oscillation electric current by capacitor discharge in described electric current, simulates the fault current while there is earth fault;
There is part by being added in the voltage on conduction iron plate in described voltage, simulates the voltage-to-ground while breaking down.
K switch 5 of the present invention is single-pole double-throw switch (SPDT), adopts contact (1,2) to change the voltage of above-mentioned pressure regulator T2 output.
Capacitor of the present invention is adjustable condenser, and described resistance R is adjustable resistance, and described inductance L is controllable impedance, and the height H of the iron plate of described electric conductivity can regulate.
The present invention adopts the voltage of the fault detector induction conduction iron plate being arranged on insulated cable.
Electric current generation part of the present invention, by pressure regulator, T1 is charged to after certain numerical value to capacitor, then by resistance R, inductance L loop discharge generation transient oscillation electric current, flows through insulated cable, simulates the fault current while there is earth fault.
Voltage generation part of the present invention, meets the requirements of magnitude of voltage by regulating pressure regulator T2 and stepup transformer to make to conduct electricity iron plate, and the make contact that changes single-pole double-throw switch (SPDT) K5 is simulated the variation of the voltage-to-ground before and after breaking down.
Adjustable condenser of the present invention, adjustable resistance R, controllable impedance L, can, by these three elements are regulated, change the size of the oscillating current of output.
The fault detector being arranged on insulated cable of the present invention, does the judgement of being out of order, the indication of then reporting to the police by detecting the curent change in loop with the change in voltage of induction conduction iron plate.
Consult Fig. 1, the step of the present embodiment is as follows:
Step 1, under the condition of power-off, choosing adjustable condenser parameter is 20 μ F, and adjustable resistance is transferred to 1 Ω, and controllable impedance is transferred to 0.3mH; The no-load voltage ratio of 1,2 contacts of pressure regulator T2 is 3:1;
Step 2, Closing Switch K1, K2, other switches, in off-state, regulate pressure regulator T1, and voltage on capacitor is reached after 200V, then cut-off switch K2, K1;
Step 3, while Closing Switch K4, K5, K switch 5 is 1 place's closure in contact, regulates pressure regulator T2 and stepup transformer, and making the voltage of last output is 9Kv;
Step 4, after step 3 continues 10 minutes, Closing Switch K3 simultaneously, and by K5 from contact 1 change in contact 2 closed.There is the decay current that part produces the higher-order of oscillation in electric current, and the voltage that part occurs voltage becomes the sine wave of amplitude 3Kv from the sine wave of amplitude 9kV.Earth-fault indicator can detect the variation of the voltage and current of simulation simultaneously, and makes corresponding fault judgement, if fault detector sends the indication of reporting to the police, illustrates that fault detector action is correct; Otherwise, incorrect.
The fault current waveform that the present embodiment simulates as shown in Figure 2; The false voltage waveform simulating as shown in Figure 3.
The foregoing is only one embodiment of the present invention, but not the present invention is limited.In the scope disclosing in the present invention for the ordinary person of the art, the distortion of carrying out and improvement, all should belong to the protection domain of patent of the present invention.
Claims (5)
1. a pick-up unit for earth-fault indicator performance, is characterized in that, the structure of described pick-up unit is divided into two parts: part and voltage generation part occur electric current; Described electric current generating unit separation structure is as follows: power supply V is connected with pressure regulator T1 by K switch 1, capacitor is connected with pressure regulator T1 by K switch 2, insulated cable is connected with capacitor by K switch 3, is sequentially connected with resistance R and inductance L between K switch 3 and insulated cable; Described voltage generating unit separation structure is as follows: power supply V is connected with pressure regulator T2 by K switch 4, K5, then is connected with stepup transformer, and stepup transformer is connected with an iron plate with electric conductivity; Earth-fault indicator is arranged on described insulated cable, described iron plate be vertically mounted on described earth-fault indicator under, and be provided with spacing distance.
2. the pick-up unit of a kind of earth-fault indicator performance according to claim 1, is characterized in that, described electric current occurs and voltage generation two parts do not have the connection on electric;
There is part and produce transient oscillation electric current by capacitor discharge in described electric current, simulates the fault current while there is earth fault;
There is part by being added in the voltage on conduction iron plate in described voltage, simulates the voltage-to-ground while breaking down.
3. the pick-up unit of a kind of earth-fault indicator performance according to claim 1, is characterized in that, described K switch 5 is single-pole double-throw switch (SPDT), adopts contact (1,2) to change the voltage of pressure regulator T2 output.
4. the pick-up unit of a kind of earth-fault indicator performance according to claim 1, it is characterized in that, described capacitor is adjustable condenser, and described resistance R is adjustable resistance, described inductance L is controllable impedance, and the height H of the iron plate of described electric conductivity is adjustable.
5. the pick-up unit of a kind of earth-fault indicator performance according to claim 1, is characterized in that, adopts the voltage of the fault detector induction conduction iron plate being arranged on insulated cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410338066.1A CN104111433B (en) | 2014-07-16 | 2014-07-16 | A kind of detection device of earth-fault indicator performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410338066.1A CN104111433B (en) | 2014-07-16 | 2014-07-16 | A kind of detection device of earth-fault indicator performance |
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| CN104111433A true CN104111433A (en) | 2014-10-22 |
| CN104111433B CN104111433B (en) | 2016-09-28 |
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| CN201410338066.1A Active CN104111433B (en) | 2014-07-16 | 2014-07-16 | A kind of detection device of earth-fault indicator performance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914392A (en) * | 2015-05-13 | 2015-09-16 | 云南电网有限责任公司电力科学研究院 | Distribution network fault indicator intelligent tester |
| CN105866720A (en) * | 2016-05-23 | 2016-08-17 | 国网浙江省电力公司紧水滩水力发电厂 | Fault simulation device for direct-current system |
| CN106019005A (en) * | 2016-05-17 | 2016-10-12 | 中国电力科学研究院 | Testing system and method for simulating increase of transient ground potential |
| CN109188330A (en) * | 2018-08-30 | 2019-01-11 | 云南电力试验研究院(集团)有限公司 | A kind of fault diagnosis method and system of distribution network failure indicator |
| CN110988769A (en) * | 2019-12-04 | 2020-04-10 | 国网山东省电力公司青州市供电公司 | Portable distribution line fault indicator acquisition unit tester and testing method |
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| CN202631672U (en) * | 2012-03-20 | 2012-12-26 | 上海市电力公司 | Portable detector for indicator with short-circuit and grounding fault |
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| US4686518A (en) * | 1983-07-29 | 1987-08-11 | Schweitzer Edmund O Jun | Fault indicator having trip inhibit circuit |
| SU1705776A1 (en) * | 1990-02-01 | 1992-01-15 | В.И.Гуревич и В.Б.Костенко | Self-reset line-to-line fault indicator |
| CN102073027A (en) * | 2010-11-04 | 2011-05-25 | 中国电力科学研究院 | Method for detecting action performance of failure indicator |
| CN102364355A (en) * | 2011-10-12 | 2012-02-29 | 华北电力大学 | Test device for performance of overhead line fault indicator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914392A (en) * | 2015-05-13 | 2015-09-16 | 云南电网有限责任公司电力科学研究院 | Distribution network fault indicator intelligent tester |
| CN106019005A (en) * | 2016-05-17 | 2016-10-12 | 中国电力科学研究院 | Testing system and method for simulating increase of transient ground potential |
| CN106019005B (en) * | 2016-05-17 | 2020-07-10 | 中国电力科学研究院 | Test system and method for simulating transient ground potential rise |
| CN105866720A (en) * | 2016-05-23 | 2016-08-17 | 国网浙江省电力公司紧水滩水力发电厂 | Fault simulation device for direct-current system |
| CN105866720B (en) * | 2016-05-23 | 2018-07-27 | 国网浙江省电力公司紧水滩水力发电厂 | A kind of DC system fault simulator |
| CN109188330A (en) * | 2018-08-30 | 2019-01-11 | 云南电力试验研究院(集团)有限公司 | A kind of fault diagnosis method and system of distribution network failure indicator |
| CN110988769A (en) * | 2019-12-04 | 2020-04-10 | 国网山东省电力公司青州市供电公司 | Portable distribution line fault indicator acquisition unit tester and testing method |
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| Publication number | Publication date |
|---|---|
| CN104111433B (en) | 2016-09-28 |
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