CN201156070Y - Cable fault indicator - Google Patents

Cable fault indicator Download PDF

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Publication number
CN201156070Y
CN201156070Y CNU2007201905001U CN200720190500U CN201156070Y CN 201156070 Y CN201156070 Y CN 201156070Y CN U2007201905001 U CNU2007201905001 U CN U2007201905001U CN 200720190500 U CN200720190500 U CN 200720190500U CN 201156070 Y CN201156070 Y CN 201156070Y
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CN
China
Prior art keywords
fault
current
indicator
threshold value
cable
Prior art date
Application number
CNU2007201905001U
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Chinese (zh)
Inventor
黄鹤鸣
徐绍军
蔡松涛
杨志福
李沫
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北京市电力公司
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Publication date
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Priority to CNU2007201905001U priority Critical patent/CN201156070Y/en
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Publication of CN201156070Y publication Critical patent/CN201156070Y/en

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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

Te utility model discloses a cable fault indicator, which comprises a current detecting module used for detecting the current of a ground wire; a fault judgment module used for judging whether the current detected through the current detecting module is over the preset fault threshold; an alarm module used for alarming if the judgment of the fault judgment module is yes. Through the cable fault indicator, the problem of the sectional fault detection of the 110 kV cable line and the cable line which is more than 110 kV which is increased daily in the urban electric network, the labor intensity of the line inspection personnel is reduced, the power off time is shortened, and the power supplying reliability is enhanced; the possibility of the misoperation can be effectively reduced, and the operation is simple and convenient.

Description

Cable fault indicator
Technical field
The utility model relates to the electric power application, and especially, relates to a kind of cable fault indicator.
Background technology
In electric power networks especially distribution network, because circuit branch is more, method of operation complexity is so can cause the workload of line management, maintenance very big, especially how to find the trouble spot when line failure fast and accurately, be a difficult problem of puzzlement electric system always.
At present, on electric pressure, relevant technology has breakthrough.Wherein the short trouble of 10KV and above overhead transmission line detects the reliability that can reach more than 99%, the reliability of the detection of earth fault is also more than 85%, follow in the urban distribution network 110 and the increasing of above cable line, how the cable line fault more than 110KV detects and segmentation realizes effectively breaking through, and has become one of the focus discussed in the industry and urgent problem.
The current main following technology that adopts: 10,35KV overhead transmission line short circuit, Earth Fault Detection technology; 110KV and above extra high voltage network fault detection technique; 10,35KV cable line short trouble detection technique.
Yet, in above-mentioned and other existing scheme, all fault detector is directly installed on overhead transmission line, the cable line, when line failure, fault detector is according to corresponding electric current, voltage and the sudden change situation board turning or the luminous warning of electric field on every side, the fault section of prompting line walking staff circuit, the concrete processing scheme during detection is as follows:
When electric field sudden change around the transcient short circuit time electric current, voltage, circuit and greater than certain numerical value and the time, and circuit is fast barrier and having a power failure for some reason very, then think and fault has taken place on the circuit, fault detector is carried out action and is passed through board turning or luminous demonstration, fault betides between the display that board turning shows and do not take place to move, and the track walker can find the trouble spot rapidly along the indicator that action takes place.
Prior art is apparent in view at the fault subsection efect that solves on overhead transmission line and the cable line below the 10KV, but it is also inapplicable on 110KV and above cable, its reason is: have the difference of essence between the structure of (1) 110KV and above cable and 10KV cable and the pole line, there are the very thick conduction that is used for the conducting failure electric current, screen layer in 110KV and above cable inside, and existing product and technology can not realize on operating principle; (2) existing product detects the easily heating of magnetic conduction part of electric current when the above load current of 2000A; (3) outside diameter of cable cross section is bigger, and existing product and technology can not satisfy.
Yet not proposing as yet at present can be to the technical scheme of 110KV and the effective fault location of above cable position.
The utility model content
Consider the problems referred to above and make the utility model, for this reason, fundamental purpose of the present utility model is to provide a kind of cable fault indicator, to solve the problem that can't carry out indicating fault in the correlation technique to the cable more than the 110KV.
Be installed in the ground wire of cable according to the cable fault indicator of the utility model embodiment, this indicator comprises: current detection module is used to detect the electric current of ground wire; The fault judgement module is used to judge whether the electric current that is detected by current detection module surpasses the predetermined failure threshold value; And alarm module, be then to alarm if be used for that the fault judgement module is judged as.
Wherein, the predetermined failure threshold value can comprise maximum threshold and minimum threshold, wherein, the size of electric current greater than maximum threshold or situation less than minimum threshold under, the fault judgement module is judged as and is.
On the other hand, the predetermined failure threshold value comprises predetermined sudden change threshold value and schedule time threshold range, wherein, at the variable quantity of the size of electric current greater than predetermined sudden change threshold value, and under the situation in the threshold range, the fault judgement module was judged as and was at the fixed time the duration of sudden change after-current.
In this case, surpass the predetermined failure threshold value, and under 1/2nd the situation of the predetermined sudden change threshold value in the predetermined failure threshold value greater than size of current before changing, the fault judgement module is judged as and is at the electric current that detects.
Wherein, predetermined sudden change threshold value is 120A.Schedule time threshold range is 0.06 second to 1.5 seconds.
In addition, be at indicator under the situation of state of no current and voltage, if pointer detection to current impulse, then indicator is not alarmed.
By technique scheme of the present utility model, can solve the problem that the segment failure of 110kv and above cable line detects in the urban distribution network that benefit increases, reduce track walker's labour intensity, shorten power off time, improve power supply reliability; And can effectively reduce the possibility of misoperation, use simple and convenient.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 is the block diagram according to the cable fault indicator of the utility model embodiment;
Fig. 2 a and 2b are the synoptic diagram of the detected electric current when carrying out fault judgement of the cable fault indicator according to the utility model embodiment;
Fig. 3 a, 3b, 3c, 3d and 3e are cable fault indicator according to the utility model embodiment synoptic diagram of electric current under the detected different situations when carrying out fault judgement;
Fig. 4 adopts a plurality of synoptic diagram that carry out fault judgement according to the cable fault indicator of the utility model embodiment;
Fig. 5 a and Fig. 5 b adopt cable fault indicator according to the utility model embodiment to carry out fault judgement and the synoptic diagram of the electric current that detects when closing a floodgate; And
Fig. 6 is the synoptic diagram of actual installation according to the cable fault indicator of the utility model embodiment.
Embodiment
Provide a kind of cable fault indicator according to the utility model embodiment, wherein, this indicator is installed in the ground wire of cable, is used for the electric current of inductive grounding line and judges whether cable exists fault.
As shown in Figure 1, this indicator comprises: current detection module 102 is used to detect the electric current of ground wire; Fault judgement module 104 is used to judge whether the electric current that is detected by current detection module 102 surpasses the predetermined failure threshold value; And alarm module 106, be then to alarm if be used for that fault judgement module 104 is judged as.
Wherein, the predetermined failure threshold value can comprise maximum threshold and minimum threshold, wherein, the size of electric current greater than maximum threshold or situation less than minimum threshold under, 104 of fault judgement moulds are judged as and are.Alternatively, maximum threshold is the maximum load current that mounting points may flow through when normally moving, the minimum short-circuit current that mounting points may occur when maximum threshold was the line end fault.Shown in Fig. 2 a, the electric current of this moment breaks down so can be judged as owing to surpass predetermined Is.
On the other hand; because when system was short-circuited fault, the feature that line current changes was that line current increases suddenly, outlet breaker tripping operation outage under the effect of relay protection then; line current reduces to zero again, so can be with this variation as the failure judgment foundation.That is to say that current change quantity Δ I exceeds predetermined value k with the ratio (that is rate of change) that this changes the time Δ t that continues, and this changes under the situation of time Δ t in the required time range of excision fault that continues, for example, in the scope of t1 to t2, be judged as and break down.
The predetermined failure threshold value comprises predetermined sudden change threshold value and schedule time threshold range, wherein, greater than predetermined sudden change threshold value, and duration of sudden change after-current at the fixed time under the situation in the threshold range, fault judgement module 104 is judged as and is at the variable quantity of the size of electric current.
Preferably, the electric current shown in Fig. 2 b surpasses the predetermined failure threshold value at the electric current that detects, and the predetermined sudden change threshold value in the predetermined failure threshold value is greater than size of current I before changing 01/2nd situation under (that is Δ I>0.5I, 0), fault judgement module 104 is judged as and is.Wherein, predetermined sudden change threshold value is 120A.Schedule time threshold range is 0.06 second to 1.5 seconds.
With reference to Fig. 3 a to 3e the process that the current waveform that difference is changed carries out fault judgement is described below.
Under the situation shown in Fig. 3 a, although load is very big with electric current, the no current sudden change is not so take action (alarm);
Under the situation shown in Fig. 3 b, under the situation of the big load switching shown in the figure and the input of induction-motor load,, after increasing, electric current do not reduce to zero, so be failure to actuate though the electric current direct mutation is arranged;
Under the situation of the excitation surge current in short-term shown in Fig. 3 c, satisfy direct mutation and fall zero condition, but Δ T time<t1 promptly, less than the minimum threshold that the time changes, does not therefore take action;
Under the situation of the artificial power failure shown in Fig. 3 d, because Δ t>t2, that is, and greater than the max-thresholds of time variation;
In the situation shown in Fig. 3 e, satisfy Δ I>M (sudden change threshold value), the electric current I after the variation FK=0, t1≤Δ T≤t2, so think fault, alarm module provides indicating fault.
Preferably,, can adopt following fault judgement principle as follows at high voltage single-core cable: (1) sudden change amount starting value Δ I 〉=120A, must satisfy Δ I 〉=0.5 I0, I simultaneously 0It is electric current before the fault; (2) sudden change after-current I FK=0; (3) 0.06 seconds≤Δ T≤1.5 second; (4) inhibit feature that shoves, when indicator from not only no current but also no-voltage condition, when experiencing heavy current pulse, the block action loop will not be moved.
Wherein, the startup value of Δ I must satisfy simultaneously 〉=120A and 〉=0.5I 0Condition. for example:
Work as I 0During=30A, if the electric current I F=150A after changing, then I=120A=6 I 0>0.5I0, (1) satisfies condition;
Work as I 0During=400A, if IF=520A, then Δ I=120A=0.3 Io<0.5 I 0, (1) does not satisfy condition;
Work as I 0If=500A is IF=850A, then Δ I=350A=0.7 I 0>0.5 I 0>120A, (1) satisfies condition.
In addition, Δ T is the fault mute time, or is called the fault current duration;
And the inhibition of shoving mainly is the misoperation in order to prevent that non-fault branch from causing when reclosing is unsuccessful.
In network shown in Figure 4, when a plurality of above-mentioned indicators carry out fault judgement jointly, if when permanent short trouble took place the F point, 1# and 3# indicator moved after outlet breaker CB removes fault, if CB reclosing after 1 second, and the barrier end is removed and is caused reclosing unsuccessful for some reason, CB will trip once more. then 2# and 4# indicator the first time reclosing every interior dead electricity, when overlapping once more, experience the impact of shoving, and in the effective Δ T time, electric current is eliminated again.The current waveform that they are experienced is shown in Fig. 5 a and Fig. 5 b.
Fig. 5 a is the HR current waveform figure; 5b is 2 " HR current waveform figures.
From Fig. 5-b as can be seen, when reclosing is unsuccessful, if the no-flashy-flow locking, if then the HR of non-fault branch also may satisfy the fault actions condition and malfunction. but when being designed to from no current and no-voltage condition generation current-jump, the block action signal then can be avoided misoperation.Therefore,, have voltage or current signal to exist when then inevitable requirement is normally moved in order to guarantee action request under normal circumstances, preferably, can designed lines electric current 〉=5A or line voltage distribution greater than the condition of work of 5KV.
As shown in Figure 6, when actual the structure, can will be fixed on the support according to indicator of the present utility model, current detection module and judge module can with the alarm module separate configuration.Alarm module can be the multiple device such as pilot lamp.
In sum,, can solve the problem that the segment failure of 110kv and above cable line detects in the urban distribution network that benefit increases, reduce track walker's labour intensity, shorten power off time, improve power supply reliability by means of the technical solution of the utility model; And, effectively reduce the possibility of misoperation by comprehensive basis for estimation; In addition, the utility model can adapt to the load variations situation automatically, thereby is convenient to practical application.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (6)

1. a cable fault indicator is characterized in that, described indicator is installed on the ground wire of cable, and it comprises:
Current detection module is used to detect the electric current of described ground wire;
The fault judgement module is used to judge whether the described electric current that is detected by described current detection module surpasses the predetermined failure threshold value; And
Described alarm module is then to alarm if be used for that described fault judgement module is judged as.
2. indicator according to claim 1, it is characterized in that, described predetermined failure threshold value comprises maximum threshold and minimum threshold, and wherein, described electric current surpasses described predetermined failure threshold value and is meant that the size of described electric current is greater than described maximum threshold or less than described minimum threshold.
3. indicator according to claim 1, it is characterized in that, described predetermined failure threshold value comprises predetermined sudden change threshold value and schedule time threshold range, wherein, described electric current surpasses the variable quantity of size that described predetermined failure threshold value is meant described electric current greater than described predetermined sudden change threshold value, and the duration of sudden change after-current is in described schedule time threshold range.
4. indicator according to claim 3 is characterized in that, the described predetermined sudden change threshold value in the described predetermined failure threshold value is greater than 1/2nd of described size of current before changing.
5. indicator according to claim 3 is characterized in that, described predetermined sudden change threshold value is 120A.
6. indicator according to claim 3 is characterized in that, described schedule time threshold range is 0.06 second to 1.5 seconds.
CNU2007201905001U 2007-11-30 2007-11-30 Cable fault indicator CN201156070Y (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102073027A (en) * 2010-11-04 2011-05-25 中国电力科学研究院 Method for detecting action performance of failure indicator
CN102288865A (en) * 2011-07-22 2011-12-21 北京瑞科思创科技有限公司 Method and equipment for detecting short-circuit earth fault of transmission and distribution line
CN102288866A (en) * 2011-07-25 2011-12-21 北京瑞科思创科技有限公司 Method and equipment for detecting single-phase earth fault of transmission and distribution line
CN102426317A (en) * 2011-08-29 2012-04-25 北京豪锐达科技有限公司 Fault detection method of intelligent power grid
CN102520300A (en) * 2011-11-21 2012-06-27 航天科工深圳(集团)有限公司 Circuit short-circuit fault detection method and system
CN102866289A (en) * 2012-09-05 2013-01-09 山东康威通信技术股份有限公司 Power cable sheath grounding current fault analysis method
CN103389437A (en) * 2013-07-31 2013-11-13 国家电网公司 Device and method for monitoring shielding current of secondary control cable of transformer substation in real time
CN105203925A (en) * 2015-10-12 2015-12-30 国家电网公司 Method for online detecting fault sections of 110-KV or 220-KV cable lines
CN105425092A (en) * 2015-11-17 2016-03-23 高新兴科技集团股份有限公司 Method for judging network cabinet tripping
CN104122487B (en) * 2014-08-06 2017-02-08 浙江群力电气有限公司 Method and device for identifying cable overcurrent causes
CN106383298A (en) * 2016-11-16 2017-02-08 合肥普望电子有限责任公司 Power distribution network fault detection method
CN107765140A (en) * 2017-12-06 2018-03-06 福建奥通迈胜电力科技有限公司 Simple power distribution network active failure analysis method based on fault detector board turning Information Matrix
CN107843804A (en) * 2017-10-19 2018-03-27 成都汉度科技有限公司 Method based on FTU and that fault detector realizes fault location
CN107976602A (en) * 2017-11-14 2018-05-01 长园深瑞继保自动化有限公司 High-tension cable metal outer jacket grounding circulation on-line monitoring system
CN108037412A (en) * 2017-12-06 2018-05-15 福建奥通迈胜电力科技有限公司 Simple electrical power distribution network fault location method based on electric field abrupt information battle array
CN108132419A (en) * 2017-12-06 2018-06-08 福建奥通迈胜电力科技有限公司 Simple power distribution network active failure analysis method based on current break Information Matrix
CN110376481A (en) * 2019-06-26 2019-10-25 威胜信息技术股份有限公司 Low voltage failure sensor and method are based on edge calculations low voltage failure detection system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102073027B (en) * 2010-11-04 2014-01-08 中国电力科学研究院 Method for detecting action performance of failure indicator
CN102073027A (en) * 2010-11-04 2011-05-25 中国电力科学研究院 Method for detecting action performance of failure indicator
CN102288865B (en) * 2011-07-22 2014-01-22 北京瑞科思创科技有限公司 Method and equipment for detecting short-circuit earth fault of transmission and distribution line
CN102288865A (en) * 2011-07-22 2011-12-21 北京瑞科思创科技有限公司 Method and equipment for detecting short-circuit earth fault of transmission and distribution line
CN102288866B (en) * 2011-07-25 2014-07-30 何晋章 Method and equipment for detecting single-phase earth fault of transmission and distribution line
CN102288866A (en) * 2011-07-25 2011-12-21 北京瑞科思创科技有限公司 Method and equipment for detecting single-phase earth fault of transmission and distribution line
CN102426317A (en) * 2011-08-29 2012-04-25 北京豪锐达科技有限公司 Fault detection method of intelligent power grid
CN102426317B (en) * 2011-08-29 2014-02-26 北京豪锐达科技有限公司 Fault detection method of intelligent power grid
CN102520300A (en) * 2011-11-21 2012-06-27 航天科工深圳(集团)有限公司 Circuit short-circuit fault detection method and system
CN102520300B (en) * 2011-11-21 2015-12-09 航天科工深圳(集团)有限公司 A kind of circuit short-circuit fault detection method and system
CN102866289B (en) * 2012-09-05 2014-10-29 山东康威通信技术股份有限公司 Power cable sheath grounding current fault analysis method
CN102866289A (en) * 2012-09-05 2013-01-09 山东康威通信技术股份有限公司 Power cable sheath grounding current fault analysis method
CN103389437A (en) * 2013-07-31 2013-11-13 国家电网公司 Device and method for monitoring shielding current of secondary control cable of transformer substation in real time
CN104122487B (en) * 2014-08-06 2017-02-08 浙江群力电气有限公司 Method and device for identifying cable overcurrent causes
CN105203925A (en) * 2015-10-12 2015-12-30 国家电网公司 Method for online detecting fault sections of 110-KV or 220-KV cable lines
CN105425092A (en) * 2015-11-17 2016-03-23 高新兴科技集团股份有限公司 Method for judging network cabinet tripping
CN106383298A (en) * 2016-11-16 2017-02-08 合肥普望电子有限责任公司 Power distribution network fault detection method
CN107843804A (en) * 2017-10-19 2018-03-27 成都汉度科技有限公司 Method based on FTU and that fault detector realizes fault location
CN107976602A (en) * 2017-11-14 2018-05-01 长园深瑞继保自动化有限公司 High-tension cable metal outer jacket grounding circulation on-line monitoring system
CN107765140A (en) * 2017-12-06 2018-03-06 福建奥通迈胜电力科技有限公司 Simple power distribution network active failure analysis method based on fault detector board turning Information Matrix
CN108037412A (en) * 2017-12-06 2018-05-15 福建奥通迈胜电力科技有限公司 Simple electrical power distribution network fault location method based on electric field abrupt information battle array
CN108132419A (en) * 2017-12-06 2018-06-08 福建奥通迈胜电力科技有限公司 Simple power distribution network active failure analysis method based on current break Information Matrix
CN108037412B (en) * 2017-12-06 2020-10-02 福建奥通迈胜电力科技有限公司 Simple power distribution network fault positioning method based on electric field mutation information array
CN107765140B (en) * 2017-12-06 2020-12-08 福建奥通迈胜电力科技有限公司 Power distribution network active fault studying and judging method based on fault indicator card turning information array
CN110376481A (en) * 2019-06-26 2019-10-25 威胜信息技术股份有限公司 Low voltage failure sensor and method are based on edge calculations low voltage failure detection system

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