CN102645617A - Method for detecting single-phase grounding faults of low current grounding system - Google Patents
Method for detecting single-phase grounding faults of low current grounding system Download PDFInfo
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- CN102645617A CN102645617A CN2011104125587A CN201110412558A CN102645617A CN 102645617 A CN102645617 A CN 102645617A CN 2011104125587 A CN2011104125587 A CN 2011104125587A CN 201110412558 A CN201110412558 A CN 201110412558A CN 102645617 A CN102645617 A CN 102645617A
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Abstract
The invention discloses equipment and a method for detecting single-phase grounding faults of a low current grounding system by a variable load method. The equipment and the method for detecting single-phase grounding faults of the low current grounding system by the variable load method have the advantages that the problem of low accuracy rate of the on-line detection of the single-phase grounding faults of the low current grounding system in the prior art is solved by variable loads, and the fault positions in circuits can be fast and accurately confirmed.
Description
Technical field
The present invention relates to the Power System Faults Detection method, particularly utilize a kind of method that detects single-phase grounded malfunction in grounded system of low current of variable load.
Background technology
At present the most of power distribution networks of China adopt is not system directly of neutral point, and during this type systematic generation singlephase earth fault, the failover electric current is less, and fault signature is complicated, thus the trouble spot search very difficulty.The method of Earth Fault Detection mainly adopts 5 subharmonic methods, capacitance current method, first half-wave method etc. at present, and these methods depend on the variation that singlephase earth fault front and back power distribution network parameter takes place.Own characteristic in view of small current neutral grounding system; When singlephase earth fault takes place, the fault-signal that is produced itself a little less than, and receive the electromagnetic interference (EMI) harmonic and pollute; Cause the distorted signals that obtains, these have all directly influenced selectivity and accuracy when singlephase earth fault detects.The present invention is exactly the solution that proposes to these problems.
Summary of the invention
The objective of the invention is to solve the not high problem of present online detection single-phase grounded malfunction in grounded system of low current accuracy rate.
For this reason, the invention provides the equipment that a kind of variable load method detects single-phase grounded malfunction in grounded system of low current, it comprises variable load cabinet and failure detector.
Wherein the variable load cabinet is made up of three vacuum switches, high-voltage and current-limitation resistance, controller and cabinet.
The present invention also provides a kind of a kind of method that detects single-phase grounded malfunction in grounded system of low current of utilizing variable load, and it has utilized the said equipment, and concrete steps are following: three vacuum switches of variable load cabinet are A, B, the C three-phase of link respectively; When earth fault took place in somewhere on the circuit, the PT residual voltage of transformer station raise, and the ground connection phase-to-ground voltage reduces, but not the fault phase-to-ground voltage raises; The variable load cabinet controller is controlled the load current that corresponding switch closes and load current on the faulty line (section) had increase by to produce because of the access of high-tension resistive R; When this switch (closes-oco with particular order and interval ...) when moving; The signal that superposes on the faulty section will cut in and out; And having this characteristic current, other non-fault line do not flow through; Install on the line and can detect faulty line and position after failure detector with transformer station detects this signal, thereby be grounded route selection and location.
The Signals & Systems signal that wherein produces belongs to the power frequency pulse train with the frequency homophase, and the width of pulse train and the interval between the pulse train have constituted the characteristic of signal, therefore is easy to detected by failure detector.
Variable load method of the present invention detects the equipment and the method for single-phase grounded malfunction in grounded system of low current; Utilize variable load to solve the not high problem of present online detection single-phase grounded malfunction in grounded system of low current accuracy rate, can confirm abort situation in the circuit rapidly and accurately.
Description of drawings
Fig. 1 is the synoptic diagram that variable load method of the present invention detects the single-phase grounded malfunction in grounded system of low current method.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated, but accompanying drawing and embodiment all being the illustration purposes of giving an example, is not in order to limit the present invention.
Embodiment
As shown in Figure 1, a kind of variable load method detects the equipment of single-phase grounded malfunction in grounded system of low current, and it comprises variable load cabinet 1 and failure detector 2.Wherein the variable load cabinet is made up of three vacuum switches, high-voltage and current-limitation resistance, controller and cabinet.
The concrete steps that the variable load method of this equipment utilization variable load detects single-phase grounded malfunction in grounded system of low current are following: three vacuum switches of variable load cabinet are A, B, the C three-phase of link respectively; If earth fault takes place in A mutually, the action of control B phase vacuum switch; Earth fault takes place in B mutually, the action of control C phase vacuum switch; Earth fault takes place in C mutually, the action of control A phase vacuum switch.When switch closed, making on the faulty section circuit 3 can extra load current of stack, and separately these current vanishes of back occur again after closing, and have so just produced the pulse train that particular law is arranged.Be installed in the electric current (crowd) that failure detector 2 on the faulty line 3 can detect these stacks, analyze its characteristic,, then provide warning message if characteristic is identical with switch motion.And the failure detector 2 that is installed on the non-fault line on 4 can not detect these electric currents (crowd), therefore can not provide warning message.
Above accompanying drawing and embodiment only are giving an example to the preferred embodiment of the invention; Those skilled in the art can understand under the situation of spirit and scope of the invention, can combine prior art the present invention to be made modification, variation and the replacement that need not pay creative work.
Claims (6)
1. a variable load method detects the equipment of single-phase grounded malfunction in grounded system of low current, and it comprises variable load cabinet and failure detector.
2. equipment according to claim 1, wherein the variable load cabinet is made up of three vacuum switches, high-voltage and current-limitation resistance, controller and cabinet.
3. a kind of method that detects single-phase grounded malfunction in grounded system of low current of utilizing variable load, it has utilized claim 1 or 2 described equipment, and concrete steps are following: three vacuum switches of variable load cabinet are A, B, the C three-phase of links respectively; When earth fault took place in somewhere on the circuit, the PT residual voltage of transformer station raise, and the ground connection phase-to-ground voltage reduces, but not the fault phase-to-ground voltage raises; The variable load cabinet controller is controlled the load current that corresponding switch closes and load current on the faulty line (section) had increase by to produce because of the access of high-tension resistive R; When this switch during with particular order and spacing movement; The signal that superposes on the faulty section will cut in and out; And other non-fault line does not have this characteristic current and flows through, and installs on the line can to detect faulty line and position after failure detector with transformer station detects this signal, thereby is grounded route selection and location.
4. method according to claim 3, the Signals & Systems signal that wherein produces is with the frequency homophase.
5. method according to claim 4, the signal that wherein produces belongs to the power frequency pulse train.
6. method according to claim 5, wherein the width of pulse train and the interval between the pulse train have constituted the characteristic of signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104125587A CN102645617A (en) | 2011-12-13 | 2011-12-13 | Method for detecting single-phase grounding faults of low current grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104125587A CN102645617A (en) | 2011-12-13 | 2011-12-13 | Method for detecting single-phase grounding faults of low current grounding system |
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| CN102645617A true CN102645617A (en) | 2012-08-22 |
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| CN2011104125587A Pending CN102645617A (en) | 2011-12-13 | 2011-12-13 | Method for detecting single-phase grounding faults of low current grounding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018631A (en) * | 2012-12-04 | 2013-04-03 | 保定供电公司 | System for 10kV fault line detection |
| CN104749486A (en) * | 2015-02-13 | 2015-07-01 | 王金全 | Residual current protector based IT system single-phase fault positioning method |
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| US4559491A (en) * | 1982-09-14 | 1985-12-17 | Asea Aktiebolag | Method and device for locating a fault point on a three-phase power transmission line |
| US20060291113A1 (en) * | 2005-05-17 | 2006-12-28 | Abb Oy | System and method for determining location of phase-to-earth fault |
| CN101261304A (en) * | 2008-04-25 | 2008-09-10 | 山东大学 | Low current grounding system distribution circuit single-phase earth fault automatic position setting method |
| CN101452038A (en) * | 2007-11-29 | 2009-06-10 | 上海蓝瑞软件技术有限公司 | Low current neutral grounding electric network single-phase earth fault diagnostic method |
| CN201514456U (en) * | 2009-10-23 | 2010-06-23 | 北京国网联合电力科技有限公司 | System for detecting single-phase earthing faults of low-current earthing system |
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2011
- 2011-12-13 CN CN2011104125587A patent/CN102645617A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4559491A (en) * | 1982-09-14 | 1985-12-17 | Asea Aktiebolag | Method and device for locating a fault point on a three-phase power transmission line |
| US20060291113A1 (en) * | 2005-05-17 | 2006-12-28 | Abb Oy | System and method for determining location of phase-to-earth fault |
| CN101452038A (en) * | 2007-11-29 | 2009-06-10 | 上海蓝瑞软件技术有限公司 | Low current neutral grounding electric network single-phase earth fault diagnostic method |
| CN101261304A (en) * | 2008-04-25 | 2008-09-10 | 山东大学 | Low current grounding system distribution circuit single-phase earth fault automatic position setting method |
| CN201514456U (en) * | 2009-10-23 | 2010-06-23 | 北京国网联合电力科技有限公司 | System for detecting single-phase earthing faults of low-current earthing system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018631A (en) * | 2012-12-04 | 2013-04-03 | 保定供电公司 | System for 10kV fault line detection |
| CN104749486A (en) * | 2015-02-13 | 2015-07-01 | 王金全 | Residual current protector based IT system single-phase fault positioning method |
| CN104749486B (en) * | 2015-02-13 | 2017-12-05 | 王金全 | A kind of IT system single-phase fault localization method based on residual current operated protective device |
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Application publication date: 20120822 |