CN201623474U - Low-current system grounding protection device with fault positioning function - Google Patents
Low-current system grounding protection device with fault positioning function Download PDFInfo
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- CN201623474U CN201623474U CN 200920287647 CN200920287647U CN201623474U CN 201623474 U CN201623474 U CN 201623474U CN 200920287647 CN200920287647 CN 200920287647 CN 200920287647 U CN200920287647 U CN 200920287647U CN 201623474 U CN201623474 U CN 201623474U
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- intelligent controller
- circuit breaker
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- 230000001681 protective effect Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
A low-current system grounding protection device with a fault positioning function not only can avoid affecting normal protection performance, but also can rapidly seek grounding fault points. The low-current system grounding protection device comprises a microcomputer intelligent controller, a split-phase circuit breaker, a zero sequence current mutual inductor and a handheld high-frequency signal receiver. A control end of the split-phase circuit breaker is connected with an output end of the microcomputer intelligent controller; the microcomputer intelligent controller is used for distinguishing whether a system is grounded and has grounding phases according to changes of line-phase voltage and zero sequence voltage of the system; and one end of the split-phase circuit breaker is connected with a substation bus. The low-current system grounding protection device is characterized in that the other end of the split-phase circuit breaker is connected with a grounding net through a low-impedance current-limiting reactor with a secondary coil, and a high-frequency voltage signal generator is connected onto the side of the secondary coil of the low-impedance current-limiting reactor through a switch controlled by the microcomputer intelligent controller to be on or off.
Description
Technical field
The utility model relates to a kind of small current system earth protective device with fault location function.
Background technology
The small current system earth protective device makes the no arcing of single phase ground fault point after the protection fast, causes earth fault not have vestige, and the tour personnel are the failure judgement point accurately.In order to address this problem, adopt voltage transformer to inject a high-frequency current signal at present to fault loop, move and the fault point is positioned along ground path with the hand-hold type high-frequency signal receiver then according to the power variation of the high-frequency signal that receives.This mode is influenced by the low impedance shunt of earth protective device, and the component that the high-frequency current signal of injection is flow on the faulty line is faint, causes detection sensitivity extremely low, still can't accurately locate the fault point.
The utility model content
The technical problems to be solved in the utility model provides a kind of normal protective value that neither influences, and can search the small current system earth protective device with fault location function of earth fault again fast.
Technical solution of the present utility model is:
Small current system earth protective device with fault location function; comprise the microcomputer-based intelligent controller; the phase-splitting circuit breaker; zero sequence current mutual inductor and hand-hold type high-frequency signal receiver; the control end of phase-splitting circuit breaker is connected with the output of microcomputer-based intelligent controller; the microcomputer-based intelligent controller is used for according to system line; the variation judgement system of phase voltage and residual voltage has or not ground connection and ground connection separate; phase-splitting circuit breaker one end is connected with substation bus bar; its special character is: the phase-splitting circuit breaker other end is connected with ground network by the Low ESR current limiting reactor with secondary coil, is connected to the high-frequency voltage signal generator in the secondary coil side of Low ESR current limiting reactor by the switch that is cut-off by the control of microcomputer-based intelligent controller.
The utility model has the advantages that:
1, adopt the Low ESR current limiting reactor to inject high-frequency signal to system fault loop; be not subjected to the shunt influence of earth protective device; use original hand-hold type high-frequency signal receiver still can position, do not influence the low-impedance protection function of earth protective device under power frequency simultaneously again the fault point.
2, adopt the Low ESR current limiting reactor that has secondary coil owing to inject signal, because of the capacity big manyfold of its equipment current-carrying capacity than the primary voltage instrument transformer, the component that the high-frequency current signal of injection is flow on the faulty line increases greatly, with the sensitivity that former injection signal method is located than can improve high resistance ground greatly the time, can search earth fault fast.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Among the figure: microcomputer-based intelligent controller 1, phase-splitting circuit breaker 2, Low ESR current limiting reactor 3, high-frequency voltage signal generator 4, zero sequence current mutual inductor 5, ground network 6, hand-hold type high-frequency signal receiver 7, three-phase voltage input Ua, Ub, Uc, system line voltage input end U1, residual voltage input Un, dc supply input+KM ,-KM, substation bus bar A, B, C, primary winding W
1, secondary coil W
2, K switch
1
Embodiment
As shown in the figure, the utility model comprises microcomputer-based intelligent controller 1, phase-splitting circuit breaker 2, zero sequence current mutual inductor 5 and hand-hold type high-frequency signal receiver 7, described microcomputer-based intelligent controller 1 has the single-chip microcomputer of high-speed, high precision sampling for many CPU, the control end of phase-splitting circuit breaker 2 is connected with the output of microcomputer-based intelligent controller 1, microcomputer-based intelligent controller 1 is provided with three-phase voltage input Ua, Ub, Uc, system line voltage input end U1 and residual voltage input Un and dc supply input+KM,-KM, microcomputer-based intelligent controller 1 is used for according to system line, the variation judgement system of phase voltage and residual voltage has or not ground connection and ground connection separate.Three phase-splitting circuit breaker 2 one ends are connected with substation bus bar A, B, C, the other end is by having secondary coil W
2Low ESR current limiting reactor 3 be connected with ground network 6.Secondary coil W at Low ESR current limiting reactor 3
2The K switch of side by cut-offfing by 1 control of microcomputer-based intelligent controller
1Be connected to high-frequency voltage signal generator 4.
During work, microcomputer-based intelligent controller 1 real-time acquisition system line, phase voltage and residual voltage, judgement system has or not single phase ground fault and ground connection separate, when taking place, gives single phase ground fault the phase breaker closing instruction of being out of order, fault phase circuit breaker is closed a floodgate fast, in less than 0.05 second, link to each other with ground network 6, realize iterative earthing, thereby shift fault point place's earth current and extinguish place, fault point ground arc by Low ESR current limiting reactor 3; This moment Low ESR current limiting reactor 3 primary winding W
1On have the system earth electric current to flow through, microcomputer-based intelligent controller 1 detects by zero sequence current mutual inductor 5 and makes K switch 1 closure after electric current is arranged, will with Low ESR current limiting reactor 3 secondary coil W
2The high-frequency voltage signal generator 4 that is connected is devoted oneself to work, and is the high-frequency voltage signal of 100～400Hz to system's injected frequency, and at Low ESR current limiting reactor 3 primary winding W
1High frequency voltage of side induction, the fault that acts directly on system goes up and produces high-frequency current mutually, and this electric current flows among capacitance to earth-jXc of system and the fault loop earth resistance Rj; Move along faulty line by hand-hold type high-frequency signal receiver 7 and to carry out the fault point and search, when leave certain some back received signal that of correspondence when dying down gradually by force be earth fault.
Claims (1)
1. small current system earth protective device with fault location function; comprise the microcomputer-based intelligent controller; the phase-splitting circuit breaker; zero sequence current mutual inductor and hand-hold type high-frequency signal receiver; the control end of phase-splitting circuit breaker is connected with the output of microcomputer-based intelligent controller; the microcomputer-based intelligent controller is used for according to system line; the variation judgement system of phase voltage and residual voltage has or not ground connection and ground connection separate; phase-splitting circuit breaker one end is connected with substation bus bar; it is characterized in that: the phase-splitting circuit breaker other end is connected with ground network by the Low ESR current limiting reactor with secondary coil, is connected to the high-frequency voltage signal generator in the secondary coil side of Low ESR current limiting reactor by the switch that is cut-off by the control of microcomputer-based intelligent controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920287647 CN201623474U (en) | 2009-12-14 | 2009-12-14 | Low-current system grounding protection device with fault positioning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920287647 CN201623474U (en) | 2009-12-14 | 2009-12-14 | Low-current system grounding protection device with fault positioning function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201623474U true CN201623474U (en) | 2010-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920287647 Expired - Fee Related CN201623474U (en) | 2009-12-14 | 2009-12-14 | Low-current system grounding protection device with fault positioning function |
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| Country | Link |
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| CN (1) | CN201623474U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035172A (en) * | 2010-12-21 | 2011-04-27 | 山西晋城无烟煤矿业集团有限责任公司 | Injection leakage protection method |
| CN103311883A (en) * | 2013-06-24 | 2013-09-18 | 上海山源电子电气科技发展有限公司 | Leakage protection system and method for mine power distribution network |
-
2009
- 2009-12-14 CN CN 200920287647 patent/CN201623474U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035172A (en) * | 2010-12-21 | 2011-04-27 | 山西晋城无烟煤矿业集团有限责任公司 | Injection leakage protection method |
| CN103311883A (en) * | 2013-06-24 | 2013-09-18 | 上海山源电子电气科技发展有限公司 | Leakage protection system and method for mine power distribution network |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20121008 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121008 Address after: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee after: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Address before: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee before: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20141214 |
|
| EXPY | Termination of patent right or utility model |