CN201562955U - Small-current system grounding protection device with automatic reset function - Google Patents
Small-current system grounding protection device with automatic reset function Download PDFInfo
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- CN201562955U CN201562955U CN2009202876490U CN200920287649U CN201562955U CN 201562955 U CN201562955 U CN 201562955U CN 2009202876490 U CN2009202876490 U CN 2009202876490U CN 200920287649 U CN200920287649 U CN 200920287649U CN 201562955 U CN201562955 U CN 201562955U
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Abstract
A small-current system grounding protection device with automatic reset function comprises an intelligent computer controller, a phase-separation circuit breaker and a zero sequence current transformer, wherein the phase-separation circuit breaker is connected with a grounding grid through a low-impedance current limiting reactor with secondary coils; the low-impedance current limiting reactor includes a primary coil and two secondary coils; one secondary coil is connected with a high-frequency voltage signal generator through a switch, and the other one is connected with the intelligent computer controller; the zero sequence current transformer detects the grounding current flowing through the system and enables the high-frequency voltage signal generator to supply a high-frequency voltage and a high-frequency current to the system; and the intelligent computer controller calculates the grounding resistance of a fault loop, compares the grounding resistance with that of the system in normal status, and automatically sends a reset command to open a fault-phase circuit breaker. The intelligent computer controller can measure and discriminate the post-fault of the low-impedance current limiting reactor, thereby automatically resetting the device without influencing the fault point protection function of the device.
Description
Technical field
The utility model belongs to single-phase grounded malfunction in grounded system of low current resist technology field in the electric power system, particularly a kind of small current system earth protective device with automatic involution function.
Background technology
The small current system earth protective device has obtained general promotion and application owing to have and good extinguish ground arc, alleviate the electrification signal and prevent defencive function such as intermittent grounding surge in electric power system.But the ability of extinguishing ground arc because of this device is too strong, makes the fault point not stay the vestige of electric arc burn, has brought very big difficulty for the related personnel searches the fault point.Adopt the regularly method of involution,, can cause that system is instantaneous to lose protective effect, also can cause the device frequent movement simultaneously if fault does not disappear.Thereby, increase and improve the automatic involution function of small current system earth protective device, be electric power system technical barrier anxious to be solved.
The utility model content
Whether the technical problems to be solved in the utility model is will provide a kind of can measure, differentiate the fault point to the single-phase grounded malfunction in grounded system of low current phase of impedance and eliminate and allow the small current system earth protective device of the automatic involution function of having of the automatic involution of earth protective device.
Technical solution of the present utility model is:
Small current system earth protective device with automatic involution function; comprise the microcomputer-based intelligent controller; phase-splitting circuit breaker and zero sequence current mutual inductor; the control end of phase-splitting circuit breaker is connected with the output of microcomputer-based intelligent controller; the secondary coil side of zero sequence current mutual inductor is connected with the current signal input 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; and when system's generation single phase ground fault, send fault phase breaker closing and instruct; its special character is: described phase-splitting circuit breaker is connected with ground network by the Low ESR current limiting reactor that has secondary coil; described Low ESR current limiting reactor has primary winding and two secondary coils; a secondary coil side is connected to the high-frequency voltage signal generator by the switch by the control of microcomputer-based intelligent controller therein; another secondary coil is connected with microcomputer-based intelligent controller voltage signal input; detect by zero sequence current mutual inductor the Low ESR current limiting reactor of flowing through primary winding the system earth electric current and by the microcomputer-based intelligent controller high-frequency voltage signal generator is devoted oneself to work; inject a high frequency voltage and high-frequency current to system; calculate the system fault loop earth resistance and compare by the microcomputer-based intelligent controller with system just often corresponding earth resistance; judge that whether the system earth fault disappears and provide automatic involution instruction, makes fault phase breaker open operation.
Advantage of the present utility model:
1) can rapidly earth fault phase current potential be clamped down on earthy level owing to this device, the ground arc that makes the fault point still unburned gets up just to keep because of no current and extinguishes, can effectively avoid having improved system's power supply reliability because ground arc causes the probability of phase fault.
2) if earth fault is human body electrification to be caused, can break away from the injury of earth current fast to human body, realized effective protection to the electrification personnel.
3) if earth fault is intermittent, can produce grounding surge and endanger system equipment insulation, because this device has become intermittent earth into stable state ground connection, can also effectively avoid the apparatus insulated damage accident that brings therefrom.
4),, can effectively avoid the long duration of action of ground arc to make device interior generation pressure and produce the serious accident of blast particularly for the equipment that is filled with oil or gas if earth fault is owing to the device interior insulation breakdown causes.
5) the utility model utilizes transformer operating characteristic and low impedance characteristic under the power frequency and the high-impedance behavior under the high frequency that the Low ESR current limiting reactor has, by apply a high frequency voltage at secondary coil, inject a high-frequency current mutually to the primary system fault, carry out high-frequency impedance measurement and differentiate fault whether disappearing, make the automatic involution of earth protective device, can not influence the defencive function of device, realize the measurement of system capacitive reactance and earth resistance simultaneously again the fault point; When another mutually earth fault takes place when system, has the function of limiting short-circuit current again.What is more important improved device with the existence of fault point effectively protect, the automatic automatic control level out of service with the disappearance of fault point.
Description of drawings
Fig. 1 is a circuit interconnect pattern of the present utility model.
Embodiment
As shown in the figure, the utility model comprises microcomputer-based intelligent controller 1, phase-splitting circuit breaker 2 and zero sequence current mutual inductor 5, and 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 U
NAnd dc supply input+KM ,-KM, the control end of phase-splitting circuit breaker 2 is connected with the output of microcomputer-based intelligent controller 1, the secondary coil side of zero sequence current mutual inductor 5 is connected with the current signal input of microcomputer-based intelligent controller 1, described phase-splitting circuit breaker 2 one ends are connected with substation bus bar A, B, C, the other end is connected with ground network 6 by the Low ESR current limiting reactor 3 that has secondary coil, and described Low ESR current limiting reactor 3 has primary winding W
1With secondary coil W
2, secondary coil W
3, at secondary coil W
3Side is connected to high-frequency voltage signal generator 4, secondary coil W by the K switch by 1 control of microcomputer-based intelligent controller
2Be connected with microcomputer-based intelligent controller 1 voltage signal input.
During work, microcomputer-based intelligent controller 1 real-time acquisition system line, phase voltage and residual voltage, the variation judgement system that reaches residual voltage has or not ground connection and ground connection separate according to system line, mutually, and when system's generation single phase ground fault, send fault phase breaker closing and instruct, make the action of fault phase circuit breaker, in 0.05s rapidly with fault through Low ESR current limiting reactor 3 iterative earthings, thereby shift fault point place's earth current and extinguish place, fault point ground arc.This moment Low ESR current limiting reactor 3 primary winding W
1There is the system earth electric current to flow through, treats that microcomputer-based intelligent controller 1 detects to have by zero sequence current mutual inductor 5 to leave instruction behind the electric current and make K switch
1Closure will be devoted oneself to work with the high-frequency voltage signal generator 4 that the secondary coil W3 of Low ESR current limiting reactor 3 links to each other, and inject a high frequency voltage and the high-frequency current that frequency is 100～400Hz to system.Secondary coil W when Low ESR current limiting reactor 3
3After obtaining high frequency voltage, will be at primary winding W
1With secondary coil W
2Induce high frequency voltage respectively, gather secondary coil W
2Both end voltage value U
2, utilize primary winding W
1With secondary coil W
2The no-load voltage ratio relation that exists between the high frequency voltage of induction just can know primary winding W
1The magnitude of voltage U at two ends
1,
U
1=(W
1/ W
2) U
2, in the formula: W
1, W
2Be respectively the number of turn of primary winding and secondary coil;
Primary winding W
1The last mutually high frequency earthing electric current I g that produces of fault that the high frequency voltage of induction acts directly on system also flows into respectively among capacitance to earth-jXc of system and the fault loop earth resistance Rj, and microcomputer-based intelligent controller 1 is according to secondary coil W
2The high frequency voltage U at two ends
2Reach the secondary high-frequency current Ig that zero sequence current mutual inductor 5 flows through
2, calculate the high-frequency resistance of system failure phase, draw fault loop earth resistance Rj; The earth resistance that fault loop earth resistance Rj and system is just often corresponding compares judges whether the system earth fault disappears; microcomputer-based intelligent controller 1 provided automatic involution instruction after earth fault disappeared; fault phase breaker open operation makes automatically resetting grounding protection device of small-current system.
Claims (1)
1. small current system earth protective device with automatic involution function; comprise the microcomputer-based intelligent controller; phase-splitting circuit breaker and zero sequence current mutual inductor; the control end of phase-splitting circuit breaker is connected with the output of microcomputer-based intelligent controller; the secondary coil side of zero sequence current mutual inductor is connected with the current signal input 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; and when system's generation single phase ground fault, send fault phase breaker closing and instruct; it is characterized in that: described phase-splitting circuit breaker is connected with ground network by the Low ESR current limiting reactor that has secondary coil; described Low ESR current limiting reactor has primary winding and two secondary coils; a secondary coil side is connected to the high-frequency voltage signal generator by the switch by the control of microcomputer-based intelligent controller therein; another secondary coil is connected with microcomputer-based intelligent controller voltage signal input; detect by zero sequence current mutual inductor the Low ESR current limiting reactor of flowing through primary winding the system earth electric current and by the microcomputer-based intelligent controller high-frequency voltage signal generator is devoted oneself to work; inject a high frequency voltage and high-frequency current to system; calculate the system fault loop earth resistance and compare by the microcomputer-based intelligent controller with system just often corresponding earth resistance; judge that whether the system earth fault disappears and provide automatic involution instruction, makes fault phase breaker open operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202876490U CN201562955U (en) | 2009-12-14 | 2009-12-14 | Small-current system grounding protection device with automatic reset function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202876490U CN201562955U (en) | 2009-12-14 | 2009-12-14 | Small-current system grounding protection device with automatic reset function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201562955U true CN201562955U (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202876490U Expired - Lifetime CN201562955U (en) | 2009-12-14 | 2009-12-14 | Small-current system grounding protection device with automatic reset function |
Country Status (1)
| Country | Link |
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| CN (1) | CN201562955U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914683A (en) * | 2012-11-01 | 2013-02-06 | 天津市电力公司 | Method for acquiring single-phase grounding current of three-phase single cable |
| FR2989824A1 (en) * | 2012-04-24 | 2013-10-25 | Alstom Technology Ltd | CIRCUIT ACTUATOR FOR CIRCUIT BREAKER CONTROL |
| CN104090258A (en) * | 2014-03-19 | 2014-10-08 | 天津市计量监督检测科学研究院 | Micro electric-energy controlling device |
-
2009
- 2009-12-14 CN CN2009202876490U patent/CN201562955U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2989824A1 (en) * | 2012-04-24 | 2013-10-25 | Alstom Technology Ltd | CIRCUIT ACTUATOR FOR CIRCUIT BREAKER CONTROL |
| WO2013160217A1 (en) * | 2012-04-24 | 2013-10-31 | Alstom Technology Ltd | Actuator circuit for control of circuit breaker |
| CN104254899A (en) * | 2012-04-24 | 2014-12-31 | 阿尔斯通技术有限公司 | Actuator circuit for control of circuit breaker |
| US10410817B2 (en) | 2012-04-24 | 2019-09-10 | General Electric Technology Gmbh | Actuator circuit for control of circuit breaker |
| CN102914683A (en) * | 2012-11-01 | 2013-02-06 | 天津市电力公司 | Method for acquiring single-phase grounding current of three-phase single cable |
| CN104090258A (en) * | 2014-03-19 | 2014-10-08 | 天津市计量监督检测科学研究院 | Micro electric-energy controlling device |
| CN104090258B (en) * | 2014-03-19 | 2017-01-04 | 天津市计量监督检测科学研究院 | Micro-electric energy control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jinzhou Tuoxin Power & Electronics Co. Assignor: Zhang Wenhui|Huang Gang Contract record no.: 2011210000031 Denomination of utility model: Small-current system grounding protection device with automatic reset function Granted publication date: 20100825 License type: Exclusive License Record date: 20110407 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100825 |