CN201449433U - Device for locating ground fault of DC system - Google Patents

Device for locating ground fault of DC system Download PDF

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Publication number
CN201449433U
CN201449433U CN200920049883XU CN200920049883U CN201449433U CN 201449433 U CN201449433 U CN 201449433U CN 200920049883X U CN200920049883X U CN 200920049883XU CN 200920049883 U CN200920049883 U CN 200920049883U CN 201449433 U CN201449433 U CN 201449433U
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CN
China
Prior art keywords
signal
unit
output terminal
ground
fault
Prior art date
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CN200920049883XU
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Chinese (zh)
Inventor
王道龙
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王道龙
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Priority to CN200920049883XU priority Critical patent/CN201449433U/en
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Publication of CN201449433U publication Critical patent/CN201449433U/en

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Abstract

The utility model discloses a device for locating ground fault of DC system, including a signal generator connected to the bus-bar wire and ground wire of the DC system, a signal collection device clamping the line to be detected of the DC system and a fault detector connected with the signal collection device. The beneficial effects of the utility model is that the device is capable of adapting DC systems of various voltage gradations, improving detection range and anti-jamming capability greatly by setting the signal collection device, the signal generator and the fault detector. The device can be used to detect the DC system in modes of indirect ground, non-metal ground, loop ground, positive and negative electrodes ground simultaneously, and multi-point ground, and can provide accurately system voltage, ground voltage, ground resistance, etc.

Description

The DC system earth fault locating device

Technical field

The utility model relates to a kind of locating device, particularly a kind of DC system earth fault locating device.

Background technology

DC system earth fault in the electric system is a kind of easy generation and the fault bigger to electric system harmfulness.No matter be plus earth or minus earth, under the situation of 2 ground connection, all may cause protection malfunction or protection tripping, the harm system normally moves.Because the complicacy and the dynamic of straight-flow system, DC ground fault often are difficult to the location, owing to the widespread use of Microcomputer Protection and complex automatic system, again the accuracy and the security of dc system grounding pick-up unit are had higher requirement simultaneously.

Summary of the invention

The purpose of this utility model is to provide a kind of accurate positioning, the DC system earth fault locating device that can accurately detect various complicated earth faults.

The utility model is that the technical scheme that its technical matters of solution is adopted is:

The DC system earth fault locating device comprises the signal generator that is connected in straight-flow system bus and ground wire, the signal picker and the fault detector that is connected signal picker of clamping straight-flow system circuit to be detected.

Further improvement as such scheme, described signal generator comprises signal generating unit and signal collection unit, described signal generating unit output terminal connects signal reshape unit, the signal reshape unit output terminal connects signal output unit, the signal output unit straight-flow system, described signal collection unit input end is connected with straight-flow system, and its output terminal connects signal analysis unit, and described signal analysis unit output terminal connects signal generating unit.

As the further improvement of such scheme, described signal generator is provided with LCDs, pilot lamp and shift knob, and described LCDs is connected with signal analysis unit.

Further improvement as such scheme, described fault detector comprises signal gathering unit, described signal gathering unit output terminal connects signal amplification unit, the signal amplification unit output terminal connects filter unit, the filter unit output terminal connects AD conversion unit, AD conversion unit connects signal processing unit, and described signal processing unit output terminal connects the fault analysis unit.

As the further improvement of such scheme, described fault detector is provided with display screen, status indicator lamp and control knob, and described display screen is connected with the fault analysis unit.

As the further improvement of such scheme, described signal picker is a split-core type meter.Described signal picker front end is provided with the tight ditch head that detects lead of pincers, and ditch head rear side is provided with hand designations, split-core type meter folding button and power light, and the signal picker rear end is provided with output terminal.

The beneficial effects of the utility model are: DC system earth fault locating device of the present utility model can be applicable to the straight-flow system of various electric pressures, it has been equipped with signal picker, and the efficient processing of multiple signal sensing range and antijamming capability have been improved greatly by signal generator and fault detector, the utility model can be indirect earthed to straight-flow system, nonmetal ground connection, loop ground connection, positive and negative while ground connection, positive negative balance ground connection, multipoint earthing accurately detects, and can accurately shows system voltage, voltage-to-ground, the ground connection resistance, branch road is connected on the trouble and worry that resistance value has really solved operation and maintainer.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the utility model signal generator schematic diagram;

Fig. 2 is the structural representation of the utility model signal generator;

Fig. 3 is the utility model fault detector schematic diagram;

Fig. 4 is the structural representation of the utility model fault detector;

Fig. 5 is the structural representation of the utility model signal picker;

Fig. 6 is a schematic diagram of the present utility model;

Fig. 7 is user mode figure of the present utility model.

Embodiment

With reference to Fig. 1~Fig. 5, DC system earth fault locating device of the present utility model comprises the signal generator 1 that is connected in straight-flow system bus and ground wire, the signal picker 3 and the fault detector 2 that is connected signal picker of clamping straight-flow system circuit to be detected.

Described signal generator 1 comprises signal generating unit 11 and signal collection unit 14, described signal generating unit 11 output terminals connect signal reshape unit 12, signal reshape unit 12 output terminals connect signal output unit 13, signal output unit 13 straight-flow systems, described signal collection unit 14 input ends are connected with straight-flow system, its output terminal connects signal analysis unit 15, and described signal analysis unit 15 output terminals connect signal generating unit 11; And signal generator 1 is provided with LCDs 16, pilot lamp 17 and shift knob 18, and described LCDs 16 is connected with signal analysis unit 15.Wherein, pilot lamp 17 comprises power lights, and the bright expression signal generator 1 of power lights is normally opened, normal lamp, and the normal bright expression of lamp system does not have earth fault, and positive and negative earth lamp is represented the positive and negative earth fault of system respectively.Shift knob 18 control-signals generator 1 switch.Signal generator 1 of the present utility model adopts battery as power supply.Should check or change battery before use, to guarantee battery electric quantity.When straight-flow system generation earth fault or insulation reduction, whole straight-flow system insulation resistance is during less than the warning setting valve, when the straight-flow system voltage monitor gives the alarm, signal generator 1 is inserted straight-flow system, signal generator 1 is judged the electric pressure of system, the polarity of earth fault, the insulation degree, and analysis insulating monitoring balanced bridge circuit connection mode and balance bridge resistor size, form the intelligence feedback of signal output, to direct current just, between negative busbar and ground, the suitable system of emission detects, system there is not the low frequency signal below the 0.178Hz of influence, and real-time display system voltage, over against ground voltage, negative voltage-to-ground and system's insulation against ground resulting impedance.

Described fault detector 2 comprises signal gathering unit 21, described signal gathering unit 21 output terminals connect signal amplification unit 22, signal amplification unit 22 output terminals connect filter unit 23, filter unit 23 output terminals connect AD conversion unit 24, AD conversion unit 24 connects signal processing unit 25, and described signal processing unit 25 output terminals connect fault analysis unit 26; And be provided with display screen 27, status indicator lamp 28 and control knob 29, described display screen 27 is connected with fault analysis unit 26. wherein, status indicator lamp 28 comprises power lights, the bright fault detector 2 of then representing of power lights is opened, ground detecting lamp, indication fault detecting device 2 is in ground connection measuring ability state, and the impedance measurement lamp illustrates that fault detector 2 is in the impedance detection state; Control knob 29 comprises the shift knob of control detection device 2 switches, carry out the function switching push button that ground connection is detected and impedance detection is changed, and the start button that begins to detect. fault detector 2 detects the direct current signal leakage current of each loop insulation against ground by signal picker 3, and simulation shows ground loop insulation degree, judge earth fault loop or branch road, and continue detection along this loop or branch road, accurately locate the trouble spot the most at last.

Described signal picker 3 is a split-core type meter, and front end is provided with the tight ditch head 31 that detects lead of pincers, and ditch head 31 rear sides are provided with hand designations 32, split-core type meter folding button 33 and the power light 34 of expression sense, and signal picker 3 rear ends are provided with output terminal 35.Ditch head 31 by split-core type meter folding button 33 control signal collectors 33 is connected with cable to be detected, and power light 34 is in opening at fault detector 2, and starts when being connected with signal picker 3, and output terminal 35 is used for being connected with fault detector 2.The output terminal 35 of signal picker 3 with after fault detector 2 is connected, is opened fault detector 2, detect ground connection with the function switching push button of control knob on the detecting device 29 and carry out function between shelves and the impedance measurement shelves and switch.

The signal link of signal generator 1 connects positive and negative busbar and ground wire respectively.After determining that signal generator 1 correctly connects, the shift knob 18 of opening signal generator 1.

The straight-flow system of the different electric pressures of signal generator 1 self-adaptation, when system did not have earth fault, normal pilot lamp was bright.LCDs 16 show insert the straight-flow system voltages, over against ground voltage, negative voltage-to-ground.When there was earth fault in system, signal generator 1 was judged polarity of ground automatically, if the positive ground connection of system, the positive ground lamp of the pilot lamp 17 of signal generator 1 is bright, in system output signal, and positive ground lamp flicker.If system bears ground connection, negative ground lamp is bright, in system output signal, and negative ground lamp flicker.LCDs 16 display systems are over against ground voltage, negative voltage-to-ground, system's insulation against ground resulting impedance simultaneously.According to the situation of DC system earth fault, signal generator 1 is received near on the positive and negative bus and ground wire of accumulator output end.Detected ground connection but loop trend branch road far away, be the raising accuracy of detection, can be connected on signal generator 1 the dc insurance exit at the branch road top nearer from the fault zone, or on the little bus of the direct current below the loop.During detection, should make signal generator 1 be connected on the power end of direct current branch all the time, and fault detector and split-core type meter detect all the time at the load side of direct current branch.

With reference to Fig. 6, signal picker 3 plugs are inserted " fault detector " split-core type meter input jack, open the detecting device power supply.Just can begin afterwards to detect.

If plus earth, on electrode cable, detection method is the same with signal picker 3 pincers; If minus earth then clamps signal picker 3 on the negative pole cable, detection method is the same.

When the multiloop line binds together, signal picker 3 pincers to be pricked on the cable at this, detection method is the same, if demonstrate right and wrong ground connection, illustrates that this detected bundle cable does not all have earth fault; If demonstrating is ground connection, illustrate that detected this pricked in cable once the road or multiloop has earth fault, must should prick the cable separate detection, detection method is the same.

After detecting the ground connection branch road, concrete earth fault is positioned detection.The user can take dichotomy to carry out the detection and location of fault zone when detecting.After each the detection, next time detection and location are all carried out by getting point mode in two minutes in the fault zone, so that promptly detect concrete earth fault; When supposing to detect the ground connection situation is arranged, do not have the ground connection situation when detecting, just can judge that earth fault is between the primary importance and the second place second position in first position.Simultaneously can be connected situation with equipment, each feeder line of fault branch be entered the mouth detect respectively, find out fault branch, further with localization of fault according to the feeder cable trend.

There are a plurality of earth faults in system, and perhaps positive and negative dc bus all has earth fault, and in the detection in each loop, device can detect the more serious branch road of earth fault automatically, detects earth fault then.Analyzing and testing result in the detection, the plus or minus earth fault that earth fault is more serious.Also can utilize the quantification index of insulation degree bar and reference insulation degree number percent, compare test result's fine difference.Carry out the detection of other branch roads after this fault is got rid of again, and earth fault is detected eliminating one by one.

DC system earth fault locating device of the present utility model can be judged the earth point direction, its judgement is to be determined jointly by the direction of arrow of card hand designations 32 of signal picker 3 during line and the fault detector 2 shown directions of arrow: with signal picker 3 directions of arrow is reference direction, when detecting, signal picker 3 directions are constant, downward when the direction of arrow that fault detector 2 shows, illustrate that the earth point direction and signal picker 3 directions of arrow are reverse directions; The direction of arrow that shows when fault detector 2 makes progress, and illustrates that the earth point direction and signal picker 3 directions of arrow are equidirectionals.

If have a utmost point or the two poles of the earth of two branch roads to link together in the system, form closed-loop system, be referred to as loop.Usually loop occurs with following several forms:

1. the positive pole of two branch roads and negative pole link to each other respectively and form loop;

2. one in the positive pole of two branch roads or the negative pole extremely link to each other to form loop;

3. the positive pole of a branch road links to each other with the negative pole of another branch road by load and forms loop in two branch roads.

If field condition allows, the connection compressing tablet of open-loop when detecting to improve detection efficiency, reduces detection time.Can not open-loop or loop itself be exactly improper, at this moment signal generator signals and all can be shunted signal by loop, causes in loop and can both detect ground signalling, causes can not find the concrete direction of earth point.Can judge earth point according to direction.

Its method as shown in Figure 6, branch road 1 and branch road 2 forms a loop, and branch road 3 is branches on the loop and earth fault is arranged.With fault detector respectively at A, B, C, D, five points of E detect, and the direction that its arrow refers to is the earth point direction that the fault detecting device is detected, according to A, and B, C, D, the direction of arrow of the E point earth point that the detects branch road at E point place as can be known is the branch of loop, and earth fault and energy localization of fault are arranged.

When detecting, can judge ground connection according to the fault detector earth lamp is whether bright, also can judge ground connection simultaneously according to shown waveform on the liquid crystal.

Claims (7)

1. DC system earth fault locating device, it is characterized in that: it comprises the signal generator (1) that is connected in straight-flow system bus and ground wire, signal picker (3) and the fault detector that is connected signal picker (3) (2) of clamping straight-flow system circuit to be detected.
2. DC system earth fault locating device according to claim 1, it is characterized in that: described signal generator (1) comprises signal generating unit (11) and signal collection unit (14), described signal generating unit (11) output terminal connects signal reshape unit (12), signal reshape unit (12) output terminal connects signal output unit (13), signal output unit (13) straight-flow system, described signal collection unit (14) input end is connected with straight-flow system, its output terminal connects signal analysis unit (15), and described signal analysis unit (15) output terminal connects signal generating unit (11).
3. DC system earth fault locating device according to claim 2, it is characterized in that: described signal generator (1) is provided with LCDs (16), pilot lamp (17) and shift knob (18), and described LCDs (16) is connected with signal analysis unit (15).
4. DC system earth fault locating device according to claim 1, it is characterized in that: described fault detector (2) comprises signal gathering unit (21), described signal gathering unit (21) output terminal connects signal amplification unit (22), signal amplification unit (22) output terminal connects filter unit (23), filter unit (23) output terminal connects AD conversion unit (24), AD conversion unit (24) connects signal processing unit (25), and described signal processing unit (25) output terminal connects fault analysis unit (26).
5. DC system earth fault locating device according to claim 4, it is characterized in that: described fault detector (2) is provided with display screen (27), status indicator lamp (28) and control knob (29), and described display screen (27) is connected with fault analysis unit (26).
6. DC system earth fault locating device according to claim 1 is characterized in that: described signal picker (3) is a split-core type meter.
7. DC system earth fault locating device according to claim 6, it is characterized in that: described signal picker (3) front end is provided with the tight ditch head (31) that detects lead of pincers, ditch head (31) rear side is provided with hand designations (32), split-core type meter folding button (33) and power light (34), and signal picker (3) rear end is provided with output terminal (35).
CN200920049883XU 2009-01-09 2009-01-09 Device for locating ground fault of DC system CN201449433U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101894218A (en) * 2010-07-22 2010-11-24 北京中恒博瑞数字电力科技有限公司 Method for quickly correcting designated node elements in node impedance matrix by multiple network operations
CN103487713A (en) * 2013-09-23 2014-01-01 国家电网公司 Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit
CN103513161A (en) * 2013-09-27 2014-01-15 孙双春 Power transmission and transformation system fault searching locating instrument and searching method
CN103743990A (en) * 2013-12-26 2014-04-23 北京交控科技有限公司 Method for detecting fault of anti-surge device in train automatic control system
CN103995158A (en) * 2013-02-17 2014-08-20 上海安科瑞电气股份有限公司 Signal generator for fault locating of medical isolation power supply system
CN104237645A (en) * 2014-09-04 2014-12-24 上海慕安电气有限公司 Online monitoring system and method for insulation state of substation DC system
CN105510773A (en) * 2016-01-28 2016-04-20 广州优维电子科技有限公司 Earth fault detection device for direct current system
CN105699845A (en) * 2016-02-26 2016-06-22 方刚 Power cable line-to-ground/electricity series fault point searching instrument of electrical device
CN108120894A (en) * 2017-12-20 2018-06-05 广州勤正电力科技有限公司 Direct-current system loop trouble-shooting system

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101894218B (en) * 2010-07-22 2012-07-04 北京中恒博瑞数字电力科技有限公司 Method for quickly correcting designated node elements in node impedance matrix by multiple network operations
CN101894218A (en) * 2010-07-22 2010-11-24 北京中恒博瑞数字电力科技有限公司 Method for quickly correcting designated node elements in node impedance matrix by multiple network operations
CN103995158B (en) * 2013-02-17 2016-10-05 安科瑞电气股份有限公司 A kind of medical treatment insulating power supply system failure signal for positioning generator
CN103995158A (en) * 2013-02-17 2014-08-20 上海安科瑞电气股份有限公司 Signal generator for fault locating of medical isolation power supply system
CN103487713A (en) * 2013-09-23 2014-01-01 国家电网公司 Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit
CN103513161A (en) * 2013-09-27 2014-01-15 孙双春 Power transmission and transformation system fault searching locating instrument and searching method
CN103513161B (en) * 2013-09-27 2017-07-14 中国石油化工股份有限公司 Electrical power trans mission/distribution system trouble shoot position indicator and lookup method
CN103743990A (en) * 2013-12-26 2014-04-23 北京交控科技有限公司 Method for detecting fault of anti-surge device in train automatic control system
CN103743990B (en) * 2013-12-26 2016-04-20 北京交控科技股份有限公司 The fault detection method of the Anti-surging device in a kind of train automatic controlling system
CN104237645A (en) * 2014-09-04 2014-12-24 上海慕安电气有限公司 Online monitoring system and method for insulation state of substation DC system
CN105510773A (en) * 2016-01-28 2016-04-20 广州优维电子科技有限公司 Earth fault detection device for direct current system
CN105510773B (en) * 2016-01-28 2018-09-21 广州优维电子科技有限公司 A kind of DC System Grounding Fault Detecting Device
CN105699845A (en) * 2016-02-26 2016-06-22 方刚 Power cable line-to-ground/electricity series fault point searching instrument of electrical device
CN105699845B (en) * 2016-02-26 2018-09-14 方刚 Electrical equipment power cable line is grounded/goes here and there electric fault point and finds instrument
CN108120894A (en) * 2017-12-20 2018-06-05 广州勤正电力科技有限公司 Direct-current system loop trouble-shooting system

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Effective date of registration: 20130814

Address after: 510000, ABCD1, B12, building 21, Sports West Road, No. 111, Sports West Road, Guangdong, Guangzhou, Tianhe District (this place is only for office use)

Patentee after: Guangzhou Topway Technology Development Co., Ltd.

Address before: 529000 No. 502, No. 41, beautiful scenery, Pengjiang District, Guangdong, Jiangmen

Patentee before: Wang Daolong

C41 Transfer of patent application or patent right or utility model
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Free format text: CORRECT: ADDRESS; FROM: 529000 JIANGMEN, GUANGDONG PROVINCE TO: 510000 GUANGZHOU, GUANGDONG PROVINCE

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Owner name: GUANGZHOU TOPWAY TECHNOLOGY CO., LTD.

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