CN101719660A - Method for automatically resetting grounding protection device of small-current system - Google Patents

Method for automatically resetting grounding protection device of small-current system Download PDF

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Publication number
CN101719660A
CN101719660A CN200910220719A CN200910220719A CN101719660A CN 101719660 A CN101719660 A CN 101719660A CN 200910220719 A CN200910220719 A CN 200910220719A CN 200910220719 A CN200910220719 A CN 200910220719A CN 101719660 A CN101719660 A CN 101719660A
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fault
current
phase
frequency
earth
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CN200910220719A
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CN101719660B (en
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张文会
黄钢
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State Grid Liaoning Electric Power Co Ltd
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张文会
黄钢
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Abstract

The invention provides a method for automatically resetting the grounding protection device of a small-current system, which has the function of automatically resetting. The method comprises the following steps: an intelligent controller of a microcomputer judges whether the small-current system is grounded and further judges the grounding phase if the system is grounded; when the system is subjected to a grounding fault, a switching-on instruction is given to a fault-phase circuit breaker, and the fault-phase circuit breaker is rapidly switched on; the fault phase is connected with a grounding grid via a low-impedance current-limiting reactor provided with a secondary coil; then, a system grounding current flowing through the primary coil of the low-impedance current-limiting reactor is detected by a zero-sequence current transformer, and a high-frequency voltage signal generator connected with the secondary coil of the low-impedance current-limiting reactor is put into operation, so a high-frequency voltage and a high-frequency current are injected into the fault phase of the system; the high-frequency impedance of the fault phase of the system can be calculated by the intelligent controller of the microcomputer, so as to obtain the grounding resistance of the faulted return circuit; and the grounding resistance thereof is further compared with that in the normal system to judge whether the grounding fault disappears, if so, an automatic resetting instruction is given, so as to switch off the fault-phase circuit breaker, thereby automatically resetting the device.

Description

Method for automatically resetting grounding protection device of small-current system
Technical field
The invention belongs to small current system single-phase earth fault resist technology field in the electric power system, particularly a kind ofly the fault point is measured, differentiated to the ground connection phase of impedance disappear and allow the method for the automatic involution of earth protective device.
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.
Summary of the invention
Whether the technical problem to be solved in the present invention provides a kind ofly can measure, differentiate the fault point to the small current system single-phase earth fault phase of impedance and eliminate and allow the method for automatically resetting grounding protection device of small-current system of the automatic involution of earth protective device.
Technical solution of the present invention is:
A kind of method for automatically resetting grounding protection device of small-current system, at first by the microcomputer-based intelligent controller according to system line, the variation judgement system of phase voltage and residual voltage has or not single phase ground fault and ground connection separate, when system's generation single phase ground fault, give the phase breaker closing instruction of being out of order, fault phase circuit breaker closes a floodgate fast, fault is connected with ground network by the Low ESR current limiting reactor that has secondary coil, thereby shift fault point place's earth current and extinguish place, fault point ground arc, described Low ESR current limiting reactor has a primary winding and two secondary coils; This moment, the primary winding of Low ESR current limiting reactor had the system earth electric current to flow through, treat to leave instruction after the microcomputer-based intelligent controller has electric current by the zero sequence current mutual inductor detection, the high-frequency voltage signal generator that will link to each other with the secondary coil of Low ESR current limiting reactor is devoted oneself to work, inject a high frequency voltage and high-frequency current mutually to the system failure, detect and calculate system failure phase high-frequency resistance through the microcomputer-based intelligent controller, draw the fault loop earth resistance; The earth resistance that fault loop earth resistance and system is just often corresponding compares judges whether the system earth fault disappears; the microcomputer-based intelligent controller provides automatic involution instruction after earth fault disappears; fault phase breaker open operation makes automatically resetting grounding protection device of small-current system.
Above-mentioned method for automatically resetting grounding protection device of small-current system; during computing system fault phase high-frequency resistance; gather another secondary coil both end voltage value by the microcomputer-based intelligent controller; utilize the no-load voltage ratio relation that exists between the high frequency voltage of primary winding and this secondary coil induction just can know the magnitude of voltage at primary winding two ends; the system failure that acts directly on the high frequency voltage of primary winding induction goes up mutually and produces the high frequency earthing electric current and flow into system's capacitance to earth and fault respectively mutually in the earth resistance; the microcomputer-based intelligent controller calculates the high-frequency resistance of system failure phase according to the secondary high-frequency current that the high frequency voltage and the zero sequence current mutual inductor at these secondary coil two ends flows through.
Above-mentioned method for automatically resetting grounding protection device of small-current system, the frequency of described high-frequency voltage signal generator are 100-400HZ.
Advantage of the present invention:
1) can rapidly earth fault phase current potential be clamped down on earthy level owing to this method, 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 method has become this ground connection 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 present invention 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 system wiring circle of the present invention.
Embodiment
As shown in the figure; the small current system earth protective device is by microcomputer-based intelligent controller 1; phase-splitting circuit breaker 2 and zero sequence current mutual inductor 5 constitute; 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; phase-splitting circuit breaker 2 one ends and substation bus bar A; B; C connects; the other end is connected with ground network 6 by the Low ESR current limiting reactor 3 with secondary coil; described Low ESR current limiting reactor 3 has primary winding W1 and secondary coil W2; secondary coil W3, the induction reactance value is advisable with 0.4-0.6 Ω under the power frequency of Low ESR current limiting reactor 3.Be connected to high-frequency voltage signal generator 4 in the secondary coil W3 of Low ESR current limiting reactor 3 side by the K switch 1 by 1 control of microcomputer-based intelligent controller, the frequency of high-frequency voltage signal generator 4 is for being 100-400HZ.Microcomputer-based intelligent controller 1 real-time acquisition system line, phase voltage and residual voltage have or not single-phase earthing and ground connection separate according to the variation judgement system of system line, phase voltage and residual voltage.Microcomputer-based intelligent controller 1 sends the instruction of fault phase breaker closing when system's generation single phase ground fault, makes fault phase breaker closing, 0.05 In rapidly the Low ESR current limiting reactor 3 of fault through having secondary coil is connected with ground network 6, realize iterative earthing, thereby the transfer fault point is located earth current and is extinguished the fault point and locate ground arc; The primary winding W1 of (behind the fault phase breaker closing) Low ESR current limiting reactor 3 has the system earth electric current to flow through at this moment, treat that microcomputer-based intelligent controller 1 detects to have by zero sequence current mutual inductor 5 and leave instruction behind the electric current and make K switch 1 closure, to devote 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, inject high frequency voltage and high-frequency current mutually to the system failure, gather secondary coil W2 both end voltage value U2, utilize the no-load voltage ratio relation (turn ratio) that exists between the high frequency voltage of primary winding W1 and secondary coil W2 induction just can know the magnitude of voltage U1 at primary winding W1 two ends
U1=(W1/W2) U2 is in the formula: W1/W 2Be respectively primary winding W1 and secondary coil W 2Turn ratio.
The system failure that acts directly on the high frequency voltage of primary winding W1 induction goes up generation high frequency earthing electric current I g mutually and also flows into respectively among capacitance to earth-jXc of system and the fault loop earth resistance Rj, the secondary high-frequency current Ig2 that microcomputer-based intelligent controller 1 flows through according to the high frequency voltage U2 and the zero sequence current mutual inductor 5 at secondary coil W2 two ends, 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 (3)

1. method for automatically resetting grounding protection device of small-current system is characterized in that:
At first have or not single phase ground fault and ground connection separate according to the variation judgement system of system line, phase voltage and residual voltage by the microcomputer-based intelligent controller, when system's generation single phase ground fault, give the phase breaker closing instruction of being out of order, fault phase circuit breaker closes a floodgate fast, fault is connected with ground network by the Low ESR current limiting reactor that has secondary coil, thereby shift fault point place's earth current and extinguish place, fault point ground arc, described Low ESR current limiting reactor has a primary winding and two secondary coils; This moment, the primary winding of Low ESR current limiting reactor had the system earth electric current to flow through, treat to leave instruction after the microcomputer-based intelligent controller has electric current by the zero sequence current mutual inductor detection, the high-frequency voltage signal generator that will link to each other with the secondary coil of Low ESR current limiting reactor is devoted oneself to work, inject a high frequency voltage and high-frequency current mutually to the system failure, detect and calculate system failure phase high-frequency resistance through the microcomputer-based intelligent controller, draw the fault loop earth resistance; The earth resistance that fault loop earth resistance and system is just often corresponding compares judges whether the system earth fault disappears; the microcomputer-based intelligent controller provides automatic involution instruction after earth fault disappears; fault phase breaker open operation makes automatically resetting grounding protection device of small-current system.
2. a kind of method for automatically resetting grounding protection device of small-current system according to claim 1; it is characterized in that: during computing system fault phase high-frequency resistance; gather another secondary coil both end voltage value by the microcomputer-based intelligent controller; utilize the no-load voltage ratio relation that exists between the high frequency voltage of primary winding and this secondary coil induction just can know the magnitude of voltage at primary winding two ends; the system failure that acts directly on the high frequency voltage of primary winding induction goes up mutually and produces the high frequency earthing electric current and flow into system's capacitance to earth and fault respectively mutually in the earth resistance; the microcomputer-based intelligent controller calculates the high-frequency resistance of system failure phase according to the secondary high-frequency current that the high frequency voltage and the zero sequence current mutual inductor at these secondary coil two ends flows through.
3. a kind of method for automatically resetting grounding protection device of small-current system according to claim 1 is characterized in that: the frequency of described high-frequency voltage signal generator is 100-400HZ.
CN2009102207195A 2009-12-14 2009-12-14 Method for automatically resetting grounding protection device of small-current system Active CN101719660B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901878A (en) * 2011-07-29 2013-01-30 施耐德电器工业公司 Monitoring device for earth line with impedance measurement
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
CN102955098A (en) * 2012-12-10 2013-03-06 四川省电力公司资阳公司 Neutral point non-effective earthing system single-phase earthing fault identification method
CN103532084A (en) * 2013-10-30 2014-01-22 江苏省电力公司常州供电公司 Integrated accident signal resetting circuit in microcomputer type relay protection circuit
CN103576022A (en) * 2012-07-31 2014-02-12 通用电气公司 On-line monitoring system for use with electrical assets and method of operating same
CN105703349A (en) * 2014-11-28 2016-06-22 辽宁拓新电力电子有限公司 Low excitation impedance transformer single-phase grounding protection device and protection method
CN107677922A (en) * 2017-11-13 2018-02-09 国网四川省电力公司广安供电公司 Single-phase grounded malfunction in grounded system of low current determination methods
CN111880110A (en) * 2019-04-15 2020-11-03 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system

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CN102931608A (en) * 2012-11-05 2013-02-13 冀北电力有限公司张家口供电公司 Switch cabinet for single-phase grounding protection of 10kV system

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US3961319A (en) * 1975-05-21 1976-06-01 Amf Incorporated Ground circuit monitor
CN1322331C (en) * 2004-06-07 2007-06-20 山东大学 Single-phase grounding selection for small-current system
CN2783338Y (en) * 2004-12-08 2006-05-24 珠海泰坦科技股份有限公司 Small current grounding line selector
CN200993669Y (en) * 2005-11-17 2007-12-19 济南富吉电气有限公司 Small-current earthing wire-selecting positioning device capable of eliminating PT harmonic vibration

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102901878A (en) * 2011-07-29 2013-01-30 施耐德电器工业公司 Monitoring device for earth line with impedance measurement
CN103576022A (en) * 2012-07-31 2014-02-12 通用电气公司 On-line monitoring system for use with electrical assets and method of operating same
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
CN102955098A (en) * 2012-12-10 2013-03-06 四川省电力公司资阳公司 Neutral point non-effective earthing system single-phase earthing fault identification method
CN102955098B (en) * 2012-12-10 2016-08-03 四川省电力公司资阳公司 System with non effectively earth ed neutral singlephase earth fault recognition methods
CN103532084A (en) * 2013-10-30 2014-01-22 江苏省电力公司常州供电公司 Integrated accident signal resetting circuit in microcomputer type relay protection circuit
CN103532084B (en) * 2013-10-30 2016-04-13 江苏省电力公司常州供电公司 The involution loop of accident resultant signal in microcomputer type relay protection loop
CN105703349A (en) * 2014-11-28 2016-06-22 辽宁拓新电力电子有限公司 Low excitation impedance transformer single-phase grounding protection device and protection method
CN107677922A (en) * 2017-11-13 2018-02-09 国网四川省电力公司广安供电公司 Single-phase grounded malfunction in grounded system of low current determination methods
CN111880110A (en) * 2019-04-15 2020-11-03 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system
CN111880110B (en) * 2019-04-15 2021-08-27 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system

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Inventor after: Zhang Wenhui

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Effective date of registration: 20130826

Address after: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No.

Patentee after: JINZHOU POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY CO., LTD.

Address before: 121000 Jinzhou power supply company of Liaoning Electric Power Co., Ltd., No. three 9 section, Guta District, Jinzhou, Liaoning, Jiefang Road

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Patentee before: Huang Gang

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