CN102841299A - Direct-current power supply insulation fault detection circuit - Google Patents
Direct-current power supply insulation fault detection circuit Download PDFInfo
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- CN102841299A CN102841299A CN2011101839994A CN201110183999A CN102841299A CN 102841299 A CN102841299 A CN 102841299A CN 2011101839994 A CN2011101839994 A CN 2011101839994A CN 201110183999 A CN201110183999 A CN 201110183999A CN 102841299 A CN102841299 A CN 102841299A
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Abstract
The invention discloses a direct-current power supply insulation fault detection circuit which comprises a plurality of outage assemblies, at least one leakage current detector, at least one positive voltage instantaneous compensator and at least one negative voltage instantaneous compensator, wherein the outage assemblies are arranged at a positive end and a negative end of each loop of a power supply system, the at least one leakage current detector is arranged in a loop to be detected in the power supply system, the at least one positive voltage instantaneous compensator is connected with the positive end of the power supply system, and the at least one negative voltage instantaneous compensator is connected with the negative end of the power supply system. By using charge-discharge circuits of the positive voltage instantaneous compensator and the negative voltage instantaneous compensator, an energy storage circuit is enabled to charge and store the electric energy; and when the positive end or the negative end of an output electric side of the leakage current detector has ground insulation degradation, a path for the backflow of the leakage current is provided, an energy accumulator discharge the electricity, the leakage current detector senses the current value difference change of the positive and negative ends and transmits alarming information or controls the outage assemblies to stop the power supply to the loop, thereby achieving the purpose of high sensibility detection.
Description
Technical field
The present invention relates to a kind of direct current supply insulation fault testing circuit, particularly a kind of circuit that can carry out the detection of electrical leakage in each loop in automatic on-line in the direct current supply running.
Background technology
Please refer to shown in Figure 1; The detection mode of 9 pairs of circuit insulation degradations of DC power-supply system of non-ground connection type or high resistance grounding type; All use electric power source 91 to be provided with ground connection alarm device 92; Measure electric power system 9 anodes change in voltage and negative terminal change in voltage over the ground over the ground, whether have the unusual of line-to-ground insulation degradation to judge bulk supply system 9.
If electric power system 9 has linked a plurality of shunt 93; And wherein one along separate routes 93 insulation degradations take place earth fault 94, the ground connection alarm device 92 of electric power system 9 can only be through measuring by the voltage difference between electric power system 9 anodes and the earth, or the voltage difference between negative terminal and the earth; Detect this electric power system 9 earth fault 94 takes place; And alarm signal is provided, and needs to shut down and, can learn it is which 93 generation earth fault 94 along separate routes each 93 detections of insulating along separate routes; Detect and alarm the shunt 93 that earth fault 94 has taken place in real time and can't reach automatic on-line, more can't end the power supply of the shunt 93 of earth fault 94 in real time.
Summary of the invention
The present invention proposes a kind of direct current supply insulation fault testing circuit; In order to the electric power system that overcomes existing non-ground connection type or high resistance grounding type when insulation degradation or earth fault take place; Can't provide the leakage current of high sensitivity to detect alarm, and can't judge the shortcoming in the loop of earth fault.
For reaching aforementioned the object of the invention, the technical scheme that the present invention adopts provides a kind of direct current supply insulation fault testing circuit, comprising:
At least one leakage current detector, this leakage current detector is located at the loop of electric power system;
At least one positive voltage transient compensation device is made up of a charge-discharge circuit and a tank circuit; This charge-discharge circuit is a resistance, and this resistance one end is linked to the positive terminal of electric power system, this tank circuit of other end series connection, and this tank circuit other end ground connection, this tank circuit is composed in parallel by a resistance and an accumulator; And
At least one negative voltage transient compensation device is made up of a charge-discharge circuit and a tank circuit; This charge-discharge circuit is a resistance, and this resistance one end is linked to the negative electricity end of electric power system, this tank circuit of other end series connection, and this tank circuit other end ground connection, this tank circuit is composed in parallel by a resistance and an accumulator.
Direct current supply insulation fault testing circuit of the present invention, wherein, each loop of electric power system is respectively equipped with this positive voltage transient compensation device and this negative voltage transient compensation device.
Direct current supply insulation fault testing circuit of the present invention, wherein, this positive voltage transient compensation device and this negative voltage transient compensation device are located at the bus (DC Bus) of electric power system.
Direct current supply insulation fault testing circuit of the present invention, wherein, the also parallelly connected discharge circuit of this charge-discharge circuit of this positive voltage transient compensation device, this discharge circuit has a unidirected discharge device.
Direct current supply insulation fault testing circuit of the present invention, wherein, this unidirected discharge device of the discharge circuit of this positive voltage transient compensation device resistance of also connecting.
Direct current supply insulation fault testing circuit of the present invention, wherein, the also parallelly connected discharge circuit of this charge-discharge circuit of this negative voltage transient compensation device, this discharge circuit has a unidirected discharge device.
Direct current supply insulation fault testing circuit of the present invention, wherein, this unidirected discharge device of the discharge circuit of this negative voltage transient compensation device resistance of also connecting.
Through technique scheme, the present invention compared with prior art has advantage at least:
Utilize positive and negative voltage transient compensation device can make the leakage current detector reach the purpose that high sensitivity detects.
The leakage current detector in each loop, but the situation of the indivedual loop insulation against ground of automatic on-line Real-time Alarm deterioration.
Description of drawings
Fig. 1: DC power-supply system in the past utilizes anode to reach negative terminal voltage-to-ground detection of ground faults circuit diagram over the ground.
Fig. 2: direct current supply insulation fault testing circuit figure of the present invention.
Fig. 3: the present invention is arranged at the leakage current flow graph in each loop.
Fig. 4: the present invention is arranged at the leakage current flow graph of bus.
Fig. 5: the present invention is arranged at leakage current flow graph between electric power source and the bus.
Fig. 6: the single loop of the present invention is provided with application drawing.
Embodiment
Please with reference to Fig. 2 and shown in Figure 3, direct current supply insulation fault testing circuit of the present invention comprises:
A plurality of outage assemblies 2 are located at the positive terminal and the negative electricity end in each loop 11 of electric power system 1, can be by the power supply in this loop 11.
A plurality of leakage current detectors 3 are located at the loop 11 of electric power system 1 respectively, are used for the leakage current value in this loop 11 of sensing, when detecting unusual leakage current, can send warning information or control this outage assembly 2 by the power supply to this loop 11.
A plurality of positive voltage transient compensation devices 4 are located at each loop 11 of electric power system 1 respectively, are made up of a charge-discharge circuit 41, a tank circuit 42 and a discharge circuit 43; This charge-discharge circuit 41 is a resistance 411, and these resistance 411 1 ends are linked to the positive terminal of electric power system 1, other end series connection accumulation circuit 42, and these tank circuit 42 other end ground connection, this tank circuit 42 is composed in parallel by a resistance 421 and an accumulator 422; This discharge circuit 43 is parallel to this charge-discharge circuit 41, and this discharge circuit 43 is composed in series by a unidirected discharge device 431 and a resistance 432.
Each loop 11 that a plurality of negative voltage transient compensation devices 5 are located at electric power system 1 respectively is made up of a charge-discharge circuit 51, a tank circuit 52 and a discharge circuit 53; This charge-discharge circuit 51 is a resistance 511, and these resistance 511 1 ends are linked to the negative electricity end of electric power system 1, other end series connection accumulation circuit 52, and these tank circuit 52 other end ground connection, this tank circuit 52 is composed in parallel by a resistance 521 and an accumulator 522; This discharge circuit 53 is parallel to this charge-discharge circuit 51, and this discharge circuit 43 is composed in series by a unidirected discharge device 531 and a resistance 532.
The charge- discharge circuit 41,51 of positive voltage transient compensation device 4 of the present invention and negative voltage transient compensation device 5 can make accumulator 422,522 through resistance 421,521 store electrical energy of charging; Discharge circuit 43,53 can let tank circuit 42,52 discharge through unidirected discharge device 431,531 immediately when line-to-ground insulation degradation 19.
Please with reference to shown in Figure 3; If loop 11 in the running is when the output electricity consumption 15 side positive terminal of this leakage current detector 3 or negative electricity end generation insulation against ground deterioration 19; Leakage current can form the path that leakage current refluxes through earth mat and accumulator 422,522 ground connection, and this accumulator 422,522 discharges through unidirected discharge device 431,531; The current value difference that this leakage current detector 3 is sensed through positive terminal and negative electricity end changes; To send warning information or control outage assembly 2, reach the purpose that high sensitivity detects, and the assistance personnel learn that in real time the unusual of insulation against ground deterioration 19 taken place in this loop 11 by power supply to this loop 11.
Please with reference to shown in Figure 4; The embodiment of the invention; Establish a positive voltage transient compensation device 4 and a negative voltage transient compensation device 5 in the bus 14 (DC Bus) of electric power system 1, each shared path that loop 11 leakage currents reflux can be provided, make leakage current detector 3 detect leakage current smoothly.
Please with reference to shown in Figure 5, another embodiment of the present invention, a positive voltage transient compensation device 4 and a negative voltage transient compensation device 5 are located between the electric power source 12 and bus 14 (DC Bus) of electric power system 1, the path that also can provide leakage current to reflux.
Please with reference to shown in Figure 6; An one positive voltage transient compensation device 4 and a negative voltage transient compensation device 5; Be arranged at the loop 11 of being unkitted leakage current detector 3, the path that can provide leakage current to reflux makes the leakage current detector 3 in other loop 11 still have the function that detects leakage current.
Though embodiment disclosed by the invention as stated, these embodiment are merely the usefulness that illustrates, and should not be interpreted as the restriction that the present invention is implemented.In not breaking away from essential scope of the present invention, other change or variation all belong to protection scope of the present invention.
Claims (7)
1. a direct current supply insulation fault testing circuit is characterized in that, comprising:
At least one leakage current detector (3), said leakage current detector (3) are located at the loop (11) of electric power system (1);
At least one positive voltage transient compensation device (4) is made up of a charge-discharge circuit (41) and a tank circuit (42); Said charge-discharge circuit (41) is a resistance (411); Said resistance (411) one ends are linked to the positive terminal of electric power system (1); The other end said tank circuit (42) of connecting; Said tank circuit (42) other end ground connection, said tank circuit (42) is composed in parallel by a resistance (421) and an accumulator (422); And
At least one negative voltage transient compensation device (5) is made up of a charge-discharge circuit (51) and a tank circuit (52); Said charge-discharge circuit (51) is a resistance (511); Said resistance (511) one ends are linked to the negative electricity end of electric power system (1); The other end said tank circuit (52) of connecting; Said tank circuit (52) other end ground connection, said tank circuit (52) is composed in parallel by a resistance (521) and an accumulator (522).
2. direct current supply insulation fault testing circuit according to claim 1 is characterized in that, each loop (11) of electric power system (1) is respectively equipped with said positive voltage transient compensation device (4) and said negative voltage transient compensation device (5).
3. direct current supply insulation fault testing circuit according to claim 1 is characterized in that, said positive voltage transient compensation device (4) and said negative voltage transient compensation device (5) are located at the bus (DCBus) (14) of electric power system (1).
4. direct current supply insulation fault testing circuit according to claim 1; It is characterized in that; The also parallelly connected discharge circuit of said charge-discharge circuit (41) (43) of said positive voltage transient compensation device (4), said discharge circuit (43) have a unidirected discharge device (431).
5. direct current supply insulation fault testing circuit according to claim 4 is characterized in that, the said unidirected discharge device (431) of said discharge circuit (43) resistance (432) of also connecting.
6. direct current supply insulation fault testing circuit according to claim 1; It is characterized in that; The also parallelly connected discharge circuit of said charge-discharge circuit (51) (53) of said negative voltage transient compensation device (5), said discharge circuit (53) have a unidirected discharge device (531).
7. direct current supply insulation fault testing circuit according to claim 6 is characterized in that, the said unidirected discharge device (531) of said discharge circuit (53) resistance (532) of also connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101839994A CN102841299A (en) | 2011-06-21 | 2011-06-21 | Direct-current power supply insulation fault detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101839994A CN102841299A (en) | 2011-06-21 | 2011-06-21 | Direct-current power supply insulation fault detection circuit |
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| CN102841299A true CN102841299A (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101839994A Pending CN102841299A (en) | 2011-06-21 | 2011-06-21 | Direct-current power supply insulation fault detection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389436A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switch insulation monitoring method and switch insulation monitoring system for direct-current power supply system |
| CN105823963A (en) * | 2016-05-17 | 2016-08-03 | 中国科学院电工研究所 | Direct-current grid fault detecting and positioning device |
| CN106970289A (en) * | 2016-01-13 | 2017-07-21 | 本德尔有限两合公司 | The method for detecting the interruption of the active conductor of ungrounded DC-voltage supply system |
| CN108693449A (en) * | 2017-04-06 | 2018-10-23 | 本德尔有限两合公司 | The system and method for connecting the redundancy DC power supply system insulation fault locations of diode |
| ES2719933A1 (en) * | 2018-11-23 | 2019-07-16 | De Heredia Escolano David Fernandez | Procedure to isolate the damaged section using an adapted dielectric strength meter, in distribution networks of the 3rd category (Machine-translation by Google Translate, not legally binding) |
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| JPS6099838U (en) * | 1983-12-15 | 1985-07-08 | 富士電機株式会社 | Inverter DC voltage detection circuit |
| CN1033880A (en) * | 1987-12-07 | 1989-07-12 | 南加利福尼亚爱迪生公司 | Fault detect |
| JPH06253449A (en) * | 1993-03-01 | 1994-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system |
| CN1641996A (en) * | 2004-01-13 | 2005-07-20 | 发那科株式会社 | Motor driver |
| KR101016780B1 (en) * | 2010-03-18 | 2011-02-25 | (주)예네 | Earth leakage breaker for direct current |
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2011
- 2011-06-21 CN CN2011101839994A patent/CN102841299A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6099838U (en) * | 1983-12-15 | 1985-07-08 | 富士電機株式会社 | Inverter DC voltage detection circuit |
| CN1033880A (en) * | 1987-12-07 | 1989-07-12 | 南加利福尼亚爱迪生公司 | Fault detect |
| JPH06253449A (en) * | 1993-03-01 | 1994-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system |
| CN1641996A (en) * | 2004-01-13 | 2005-07-20 | 发那科株式会社 | Motor driver |
| KR101016780B1 (en) * | 2010-03-18 | 2011-02-25 | (주)예네 | Earth leakage breaker for direct current |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389436A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switch insulation monitoring method and switch insulation monitoring system for direct-current power supply system |
| CN103389436B (en) * | 2013-07-24 | 2015-12-02 | 中达电通股份有限公司 | The switching type insulated monitoring method of DC power-supply system and system |
| CN106970289A (en) * | 2016-01-13 | 2017-07-21 | 本德尔有限两合公司 | The method for detecting the interruption of the active conductor of ungrounded DC-voltage supply system |
| CN105823963A (en) * | 2016-05-17 | 2016-08-03 | 中国科学院电工研究所 | Direct-current grid fault detecting and positioning device |
| CN105823963B (en) * | 2016-05-17 | 2018-11-13 | 中国科学院电工研究所 | A kind of DC grid fault detect positioning device |
| CN108693449A (en) * | 2017-04-06 | 2018-10-23 | 本德尔有限两合公司 | The system and method for connecting the redundancy DC power supply system insulation fault locations of diode |
| US10649037B2 (en) | 2017-04-06 | 2020-05-12 | Bender Gmbh & Co. Kg | Insulation fault location systems and methods for insulation fault location for a redundant DC power supply system coupled to diodes |
| CN108693449B (en) * | 2017-04-06 | 2020-09-04 | 本德尔有限两合公司 | System and method for diode-connected redundant DC power supply system insulation fault location |
| ES2719933A1 (en) * | 2018-11-23 | 2019-07-16 | De Heredia Escolano David Fernandez | Procedure to isolate the damaged section using an adapted dielectric strength meter, in distribution networks of the 3rd category (Machine-translation by Google Translate, not legally binding) |
| WO2020104711A1 (en) * | 2018-11-23 | 2020-05-28 | Fernandez De Heredia Escolano David | Method for isolating a faulty section using an adapted dielectric strength meter in category 3 distribution networks |
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Application publication date: 20121226 |