CN102005741A - Distribution network line single phase earthing fault diagnosis and isolation method and device - Google Patents

Distribution network line single phase earthing fault diagnosis and isolation method and device Download PDF

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Publication number
CN102005741A
CN102005741A CN2010105301914A CN201010530191A CN102005741A CN 102005741 A CN102005741 A CN 102005741A CN 2010105301914 A CN2010105301914 A CN 2010105301914A CN 201010530191 A CN201010530191 A CN 201010530191A CN 102005741 A CN102005741 A CN 102005741A
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China
Prior art keywords
current
zero
phase
distribution network
increment
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Pending
Application number
CN2010105301914A
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Chinese (zh)
Inventor
李成榕
陈维江
齐波
梅素真
郭卫东
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North China Electric Power University
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
Original Assignee
North China Electric Power University
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
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Application filed by North China Electric Power University, Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd filed Critical North China Electric Power University
Priority to CN2010105301914A priority Critical patent/CN102005741A/en
Publication of CN102005741A publication Critical patent/CN102005741A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The invention discloses a distribution network line single phase earthing fault diagnosis and isolation method and device. The method comprises the following steps: detecting the voltage and current of a distribution network line, determining whether zero sequence current increment exceeds the limit; judging a single phase earthing fault line; and carrying out the isolation of the single phase earthing fault according to a judgment result. By the invention, reliable judgment and isolation of the distribution network single phase earthing fault lines can be realized, and the reliability, economical efficiency and safety of the power supply of the distribution network can be improved.

Description

Method and device that the power distribution network line single phase grounding failure is judged and isolated
Technical field
The invention belongs to the controller switching equipment technical field, relate in particular to method and device that a kind of power distribution network line single phase grounding failure is judged and isolated.
Background technology
The power distribution network number is huge, has a very wide distribution, and apparatus insulated level is low, and the influence that is subject to electrical network internal overvoltage and extraneous natural environment causes single phase ground fault, and power supply reliability is in urgent need to be improved.Though failure line selection and faulty indication can improve the power distribution network reliability of operation to a certain extent, but if fault branch is not in time isolated, non-fault section user's power supply reliability is reduced, and the voltage to earth that can make the non-fault phase of the whole network that operates with failure for a long time rises, easily cause the puncture of line insulation weak link, cause phase fault even three phase short circuit fault, the expansion that causes the accident.Therefore if can judge fast for the circuit that single phase ground fault takes place and accurately isolation at power distribution network, not only can make a certain user's fault can not cause the power failure of basic routing line and neighboring user, reduce the responsibility dispute, accident responsibility out-of-bounds is well defined, and fault location point fast, avoid the whole piece circuit is patrolled, the coverage of line failure and the extent of injury are reduced to minimum, improve reliability, fail safe and the economy of power distribution network power supply greatly.
The method of in the correlation technique one-phase earthing failure in electric distribution network circuit being judged and isolating mainly is to rely on fault current power frequency transient state, stable state, harmonic wave, amount of information such as energy, cooperate signal injection or reclosing to realize that single phase ground fault is judged and isolation, but effect from reality, because the power distribution network operational mode is flexible, network configuration relative complex and the variation of neutral point operational mode, the characteristic quantity of faulty line is not obvious, the method that provides in the correlation technique is difficult to the single phase ground fault circuit of power distribution network is carried out accurately, judge effectively and isolation that reliability and accuracy are all very low.Therefore, seeking the method that effective power distribution network line single phase grounding failure is judged and isolated, improve the judgement of power distribution network line single phase grounding failure and science, accuracy, the reliability of isolation, is to improve problem anxious to be solved in the power distribution network power supply reliability.
At in the correlation technique power distribution network line single phase grounding failure being judged and the reliability and the lower problem of accuracy of isolating, effective solution is not proposed as yet at present.
Summary of the invention
The objective of the invention is to propose method and the device that a kind of power distribution network line single phase grounding failure is judged and isolated in the existing correlation technique power distribution network line single phase grounding failure being judged with the lower problem of the reliability of isolating and accuracy.
To achieve these goals, according to an aspect of the present invention, the method that provides a kind of power distribution network line single phase grounding failure to judge and isolate.
Method according to power distribution network line single phase grounding failure judgement of the present invention and isolation comprises: the power distribution network circuit is carried out the detection of voltage, electric current; Whether the increment of judging zero-sequence current is out-of-limit; The judgement of single phase ground fault circuit; Carry out the isolation of single phase ground fault according to the result who judges.
Preferably, the voltage that detects distribution line must be checked one of following at least: single-phase voltage, three-phase voltage, voltage between phases; Detect the electric current of distribution line and must check zero-sequence current at least, monophase current and three-phase current are optional to be checked.
Preferably, the increment of zero-sequence current comprises one of following at least: the increment of the increment of zero sequence active current, zero sequence reactive current.
Preferably, before whether the increment of judging zero-sequence current was out-of-limit, this method also comprised: whether the time interval of twice voltage, current acquisition delays time greater than preset time before and after judging; In judged result is under the situation that is, the data that obtain is converted to the increment of zero-sequence current.
Preferably, the determination methods of single phase ground fault circuit comprises one of following at least: the direction of the direction of the increment of zero sequence active current, zero sequence reactive current, the increment of zero sequence active current, zero sequence reactive current.
Preferably, before the single phase ground fault circuit was carried out Fault Isolation, this method also comprised: judge whether the tripping operation time-delay is finished; In judged result is under the situation that is, the faulty line of judging is excised.When the tripping operation time-delay is zero, can realize the instantaneous isolation of single phase ground fault circuit.
To achieve these goals, according to a further aspect in the invention, the device that provides a kind of power distribution network line single phase grounding failure to judge and isolate.
Device according to power distribution network line single phase grounding failure judgement of the present invention and isolation comprises: detection module, and the voltage, the electric current that are used for distribution line detect; Modular converter is used for detected data are converted to the increment of zero-sequence current; Comparison module is used for the increment of the zero-sequence current that will obtain and preset threshold and direction and compares; Judge module is used for carrying out the judgement of one-phase earthing failure in electric distribution network circuit according to result relatively; Executive Module is used for carrying out according to the result who judges the Fault Isolation of one-phase earthing failure in electric distribution network circuit.
Preferably, device comprises: second judge module, whether the time interval of twice voltage, current acquisition delays time greater than preset time before and after being used to judge.
By the present invention, adopt the power distribution network circuit is carried out the detection of voltage, electric current; Detected data are converted to the increment of zero-sequence current; The increment of the zero-sequence current that obtains and preset threshold and direction are compared; Carry out the judgement of one-phase earthing failure in electric distribution network circuit according to result relatively; Carry out the Fault Isolation of one-phase earthing failure in electric distribution network circuit according to the result who judges, solved in the correlation technique power distribution network line single phase grounding failure has been judged and the reliability and the lower problem of accuracy of isolating, and then reached the effect that improves the power distribution network power supply reliability.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is according to the power distribution network line single phase grounding failure judgement of the embodiment of the invention and the flow chart of partition method;
Fig. 2 is according to the preferred power distribution network line single phase grounding failure judgement of the embodiment of the invention and the flow chart of partition method;
Fig. 3 is according to the power distribution network line single phase grounding failure judgement of the embodiment of the invention and the schematic diagram of spacer assembly.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
According to embodiments of the invention, provide a kind of power distribution network line single phase grounding failure to judge and partition method.
Fig. 1 is according to the power distribution network line single phase grounding failure judgement of the embodiment of the invention and the flow chart of partition method.
As shown in Figure 1, this method comprises that following step S101 is to step S104:
Step S101 carries out the detection of voltage, electric current to the power distribution network circuit;
Step S102 judges whether the increment of zero-sequence current is out-of-limit;
Step S103, the judgement of single phase ground fault circuit;
Step S104 carries out the isolation of single phase ground fault according to the result who judges.
Preferably, the voltage of distribution line, electric current comprise following one of at least: single-phase voltage, three-phase voltage, voltage between phases, monophase current, three-phase current and zero-sequence current.
Preferably, the increment of zero-sequence current comprise following one of at least: the increment of the increment of zero sequence active current, zero sequence reactive current.
Preferably, before whether the increment of judging zero-sequence current was out-of-limit, this method also comprised: whether the time interval of twice voltage, current acquisition delays time greater than preset time before and after judging; In judged result is under the situation that is, the data that obtain is converted to the increment of zero-sequence current.
Preferably, the determination methods of single phase ground fault circuit comprise following one of at least: the direction of the direction of the increment of zero sequence active current, zero sequence reactive current, the increment of zero sequence active current, zero sequence reactive current.
Preferably, before the single phase ground fault circuit was carried out Fault Isolation, this method also comprised: judge whether the tripping operation time-delay is finished; In judged result is under the situation that is, the faulty line of judging is excised.When the tripping operation time-delay is zero, can realize the instantaneous isolation of single phase ground fault circuit.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Power distribution network line single phase grounding failure provided by the invention is judged and the purpose of partition method provides a kind of power distribution network line single phase grounding failure judgement and shielding system, with the effective judgement and the isolation of one-phase earthing failure in electric distribution network circuit.
Fig. 2 is according to the preferred power distribution network line single phase grounding failure judgement of the embodiment of the invention and the flow chart of partition method.
As shown in Figure 2, this method comprises the steps;
Step S201 carries out the detection of voltage, electric current to the power distribution network circuit.
Step S202, whether the time interval of twice voltage in judgement front and back, current acquisition delays time greater than preset time, preferably, whether the time interval of judging twice voltage in front and back, current acquisition is greater than 2 seconds, if judged result is for being then to change step S203 over to, if judged result is otherwise returns step S202.
Step S203, voltage, the current conversion of the power distribution network circuit that step S201 is obtained are the increment of zero-sequence current.
Increment with the zero sequence reactive current is an example, and last time Cai Yang electrical network residual voltage was The zero-sequence current of circuit is Calculate With Between phase angle difference This moment, last time the idle amount of zero-sequence current of sampling was I Q= The electrical network residual voltage of back time sampling is The zero-sequence current of circuit is Calculate With Between phase angle difference This moment, last time the idle amount of zero-sequence current of sampling was Then the increment of the zero sequence reactive current of double sampling is
Δ I Q = | I Q ′ | - | I Q |
Step S204, whether the increment of the power distribution network circuit zero sequence reactive current that determining step S203 obtains is out-of-limit, preferably, this limit value is set at 5A, if greater than this limit value then change step S205 over to, if be less than or equal to then return judgement and the isolation that step S201 carries out the one-phase earthing failure in electric distribution network circuit of a new round.
Step S205, whether the minimum value in the difference array that determining step S204 obtains is less than credible threshold value T, preferably, this credible threshold setting is 0.25, if less than credible threshold value T then change step S206 over to, if greater than would return judgement and the isolation that step S202 carries out the one-phase earthing failure in electric distribution network circuit of a new round.
Step S206 carries out the isolation of single phase ground fault according to the result who judges.
Preferably, above-mentioned preferred power distribution network line single phase grounding failure according to the embodiment of the invention judges and partition method can be finished by a device, also can finish jointly by multiple arrangement.
From above description, as can be seen, the invention provides a kind of method and the device that can realize accurately, reliably that the power distribution network line single phase grounding failure is judged and isolated, solved in the correlation technique power distribution network line single phase grounding failure has been judged and the reliability and the lower problem of accuracy of isolating, thereby reached the effect that improves the power distribution network power supply reliability.
According to embodiments of the invention, the device that provides a kind of power distribution network line single phase grounding failure to judge and isolate.
Fig. 3 is according to the power distribution network line single phase grounding failure judgement of the embodiment of the invention and the schematic diagram of spacer assembly.
As shown in Figure 3, this device comprises: detection module 301, modular converter 302, comparison module 303 and first judge module 304.
Wherein, detection module 301 is used for the power distribution network circuit is carried out the detection of voltage, electric current; Modular converter 302 is used for detected data are converted to the increment of zero-sequence current; Comparison module 303 is used for the increment of the zero-sequence current that will obtain and preset threshold and direction and compares; First judge module 304 is used for carrying out the judgement of one-phase earthing failure in electric distribution network circuit according to result relatively; Executive Module 305 is used for carrying out according to the result who judges the Fault Isolation of one-phase earthing failure in electric distribution network circuit.
Preferably, this checkout gear also comprises: second judge module 306.
Wherein, whether the time interval of twice voltage, current acquisition delayed time greater than preset time before and after second judge module 306 was used to judge.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. the method that the power distribution network line single phase grounding failure is judged and isolated is characterized in that, comprising:
The power distribution network circuit is carried out the detection of voltage, electric current;
Whether the increment of judging zero-sequence current is out-of-limit;
The judgement of single phase ground fault circuit;
Carry out the isolation of single phase ground fault according to the result who judges.
2. the method for claim 1 is characterized in that, the voltage that detects distribution line must be checked one of following at least: single-phase voltage, three-phase voltage, voltage between phases; Detect the electric current of distribution line and must check zero-sequence current at least, monophase current and three-phase current are optional to be checked.
3. method as claimed in claim 1 or 2 is characterized in that, it is one of following that the increment of zero-sequence current comprises at least: the increment of the increment of zero sequence active current, zero sequence reactive current.
4. method as claimed in claim 1 or 2 is characterized in that, before whether the increment of judging zero-sequence current was out-of-limit, this method also comprised: whether the time interval of twice voltage, current acquisition delays time greater than preset time before and after judging; In judged result is under the situation that is, the data that obtain is converted to the increment of zero-sequence current.
5. the method for claim 1 is characterized in that, it is one of following that the determination methods of single phase ground fault circuit comprises at least: the direction of the direction of the increment of zero sequence active current, zero sequence reactive current, the increment of zero sequence active current, zero sequence reactive current.
6. the method for claim 1 is characterized in that, before the single phase ground fault circuit was carried out Fault Isolation, this method also comprised: judge whether the tripping operation time-delay is finished; In judged result is under the situation that is, the faulty line of judging is excised; When the tripping operation time-delay is zero, can realize the instantaneous isolation of single phase ground fault circuit.
7. the device that the power distribution network line single phase grounding failure is judged and isolated is characterized in that, comprising:
Detection module, the voltage, the electric current that are used for distribution line detect;
Modular converter is used for detected data are converted to the increment of zero-sequence current;
Comparison module is used for the increment of the zero-sequence current that will obtain and preset threshold and direction and compares;
First judge module is used for carrying out the judgement of one-phase earthing failure in electric distribution network circuit according to result relatively;
Executive Module is used for carrying out according to the result who judges the Fault Isolation of one-phase earthing failure in electric distribution network circuit;
Above-mentioned five modules link to each other successively.
8. device as claimed in claim 7 is characterized in that, described device comprises: second judge module between detection module and modular converter, is used to judge whether the time interval of twice voltage in described front and back, current acquisition delay time greater than preset time.
CN2010105301914A 2010-10-29 2010-10-29 Distribution network line single phase earthing fault diagnosis and isolation method and device Pending CN102005741A (en)

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Cited By (7)

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CN102231517A (en) * 2011-06-09 2011-11-02 航天科工深圳(集团)有限公司 Method and system for determining and isolating power distribution network fault
CN103197201A (en) * 2013-03-07 2013-07-10 福建省电力有限公司 Low-resistance, medium-resistance and high-resistance grounding fault type recognition method of power transmission line
CN104764971A (en) * 2015-03-18 2015-07-08 广东电网有限责任公司电力科学研究院 Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator
CN109470994A (en) * 2018-11-09 2019-03-15 南京大贺电力科技有限公司 Faulty line judgement system and method for power distribution network
CN109541379A (en) * 2019-01-18 2019-03-29 云南电网有限责任公司电力科学研究院 The selection method and device that controllable voltage source earth current compensates entirely
CN109782125A (en) * 2018-12-25 2019-05-21 中国南方电网有限责任公司超高压输电公司曲靖局 A kind of earth-free Single-phase Earth Fault of Power System identification and partition method
CN110261722A (en) * 2019-08-06 2019-09-20 云南电网有限责任公司电力科学研究院 A kind of single-phase earthing of isolated neutral system differentiates and sentences phase method

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CN102231517A (en) * 2011-06-09 2011-11-02 航天科工深圳(集团)有限公司 Method and system for determining and isolating power distribution network fault
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CN109541379A (en) * 2019-01-18 2019-03-29 云南电网有限责任公司电力科学研究院 The selection method and device that controllable voltage source earth current compensates entirely
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CN110261722A (en) * 2019-08-06 2019-09-20 云南电网有限责任公司电力科学研究院 A kind of single-phase earthing of isolated neutral system differentiates and sentences phase method
CN110261722B (en) * 2019-08-06 2021-02-02 云南电网有限责任公司电力科学研究院 Single-phase grounding judgment and phase judgment method of neutral point ungrounded system

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