CN203365603U - Portable direct-current system ground fault locating device - Google Patents
Portable direct-current system ground fault locating device Download PDFInfo
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- CN203365603U CN203365603U CN 201320423335 CN201320423335U CN203365603U CN 203365603 U CN203365603 U CN 203365603U CN 201320423335 CN201320423335 CN 201320423335 CN 201320423335 U CN201320423335 U CN 201320423335U CN 203365603 U CN203365603 U CN 203365603U
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Abstract
The utility model discloses a portable direct-current system ground fault locating device. The portable direct-current system ground fault locating device comprises a signal generator and a fault point locating device which are independent and separated from each other. The portable direct-current system ground fault locating device is characterized in that the signal generator is connected with direct-current system main circuit positive and negative buses and the ground, and the fault point locating device is connected with direct-current system detected branch circuit positive and negative buses. According to the portable direct-current system ground fault locating device provided in the utility model, the signal generator is used to transmit an interference-free ultralow frequency signal which is suitable for detection, so the active detection of direct-current system ground faults can be realized, the advantage of high detection accuracy degree can be realized, the fault point locating device has advantages of small size, convenient carry, convenient utilization and fast and accurate fault locating, and the locating of multi-point ground and high-resistance ground points can be realized.
Description
Technical field
The utility model relates to a kind of Portable direct current system earthing fault locating instrument, belongs to power system automatic field.
Background technology
Relay protection in transformer station, control all adopt direct current supply, so whether the DC power-supply system state of transformer station directly has influence on safely the substation operation state.DC system earth fault be a kind of easy generation and to electric system harmfulness larger fault.Straight-flow system is insulation system, and when normal, positive and negative electrode insulation against ground resistance equates, positive and negative electrode voltage-to-ground balance.When one point earth occurs, the positive and negative electrode voltage-to-ground changes, and the earthing pole voltage-to-ground reduces, and ungrounded pole tension raises, and no matter is plus earth or minus earth, all may cause protection malfunction or protection tripping, and the harm primary system normally moves.
At present, the ground fault detection equipment mostly used is passive type, to straight-flow system, do not launch any signal specific, whether the leakage current of each duplexure of direct-detection judges ground connection, but due to complicacy, the dynamic of straight-flow system and contain various undesired signals, therefore will accurately locate earth point more difficult, DC ground fault often is difficult to quick and precisely locate.Simultaneously, the DC system earth fault monitoring equipment is mostly fixed, can't realize moving, and can only determine the duplexure that earth fault occurs, and can't give accurate location to trouble spot, and can't measure many earth fault of same duplexure.Simultaneously, due to the widespread use of Microcomputer Protection and complex automatic system, again accuracy and the security of DC system earth fault monitoring device are had higher requirement.
The utility model content
Technical problem to be solved in the utility model is, provides a kind of employing active Earth Fault Detection technology, detects earth point quick and precisely and can move the Portable direct current system earthing fault locating instrument of use.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of Portable direct current system earthing fault locating instrument, comprise: the signal generator independently separated and localization of fault instrument, it is characterized in that: described signal generator is connected with ground with straight-flow system major loop positive and negative busbar, described signal generator comprises the control system connected successively, signal generator, signal shaper, signal output device, the first signal collector, the first analog to digital converter and signal analyzer, described signal analyzer connects respectively the first liquid crystal display and described control system, described localization of fault instrument is connected with the tested duplexure positive and negative busbar of straight-flow system, described localization of fault instrument comprises the secondary signal collector connected successively, signal amplifier, wave filter, the second analog to digital converter, signal processor and fault detection analysis device, described fault detection analysis device connects respectively the second liquid crystal display and acousto-optic driver.
Described signal generator emission ultra-low frequency signal, ultra-low frequency signal enters straight-flow system major loop and ground through described signal shaper and described signal output device, obtains the earth fault signal through described first signal collector, the first analog to digital converter, signal analyzer and the first liquid crystal display successively.
It is the above sensor of 0.01mA that described secondary signal collector adopts resolution.
Described localization of fault instrument is split-core type meter.
The Portable direct current system earthing fault locating instrument that the utility model provides, the signal generator emission is applicable to detecting, glitch-free ultra-low frequency signal, has realized the active detection to DC system earth fault, and accuracy in detection is high; Localization of fault instrument volume is little, can move, and is convenient for carrying, and easy to use and secondary signal collector adopts high-precision sensor, to localization of fault quick and precisely, can realize the location to multipoint earthing and high resistance ground point; In addition; the application of Microcomputer Protection, complex automatic system is also used fuzzy control theory and the Noise Theory of communicating by letter on software; the software computing method have been optimized according to the characteristics of straight-flow system; both made system that the impact of interference, electromagnetic pulse interference and other noise of large distributed capacitance is arranged; also can judge exactly earth fault, for searching of earth fault provides sound assurance.
The accompanying drawing explanation
The structural representation that Fig. 1 is signal generator;
The structural representation that Fig. 2 is the localization of fault instrument;
Fig. 3 is the Design of DC System Grounding Fault Detection schematic diagram;
Fig. 4 is many earth points fault detect schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1-2, a kind of Portable direct current system earthing fault locating instrument, comprise: the signal generator independently separated and localization of fault instrument, it is characterized in that: described signal generator is connected with ground with straight-flow system major loop positive and negative busbar, described signal generator comprises the control system connected successively, signal generator, signal shaper, signal output device, the first signal collector, the first analog to digital converter and signal analyzer, described signal analyzer connects respectively the first liquid crystal display and described control system, described localization of fault instrument is connected with the tested duplexure positive and negative busbar of straight-flow system, described localization of fault instrument comprises the secondary signal collector connected successively, signal amplifier, wave filter, the second analog to digital converter, signal processor and fault detection analysis device, described fault detection analysis device connects respectively the second liquid crystal display and acousto-optic driver.
Described signal generator emission ultra-low frequency signal, ultra-low frequency signal enters straight-flow system major loop and ground through described signal shaper and described signal output device, obtains the earth fault signal through described first signal collector, the first analog to digital converter, signal analyzer and the first liquid crystal display successively.
It is the above sensor of 0.01mA that described secondary signal collector adopts resolution.
Described localization of fault instrument is split-core type meter, and described split-core type meter can be carried, and by the measurement point of the tested duplexure of conversion straight-flow system, determines earth fault.
Described the second liquid crystal display realizes that waveform shows simultaneously, impedance display, and direction shows.
Described impedance display is with the formal intuition demonstration of insulation index, and described insulation index range is 0 ~ 100.
After described fault detection analysis device produces the earth fault signal, the instruction acousto-optic driver is reported to the police.
Described the first liquid crystal display shows that straight-flow system main circuit voltage, straight-flow system major loop are over against ground voltage, the negative voltage-to-ground of straight-flow system major loop and straight-flow system major loop insulation against ground resulting impedance in real time.
Described signal generator and described fault detection analysis device are double-deck anti-distributed capacitance design, eliminate the distributed capacitance impact fully, make measurement result accurate.
A kind of principle of work of Portable direct current system earthing fault locating instrument:
When straight-flow system generation earth fault or insulation reduction, when the straight-flow system voltage monitor gives the alarm, signal generator is accessed to straight-flow system major loop and ground, the electric pressure of the control system automatic decision straight-flow system of signal generator, the polarity of earth fault, the insulation degree, automatic analysis insulating monitoring balanced bridge circuit connection mode and balance bridge resistor size, form the Intelligence Feedback of signal output, the described signal generator of instruction to straight-flow system just, negative busbar and ground emission are applicable to detecting, glitch-free ultra-low frequency signal, ultra-low frequency signal enters straight-flow system major loop and ground through described signal shaper and described signal output device, successively through described first signal collector, the first analog to digital converter, signal analyzer and the first liquid crystal display obtain the earth fault signal, described the first liquid crystal display shows the straight-flow system main circuit voltage in real time, the straight-flow system major loop is over against ground voltage, the negative voltage-to-ground of straight-flow system major loop and straight-flow system major loop insulation against ground resulting impedance, the fault data that the first liquid crystal display shows is comprehensive, even just, negative pole is ground connection and changing in proportion over against ground voltage and negative voltage-to-ground simultaneously, also can accurately locate failure message.
When described the first liquid crystal display shows the earth fault signal, the tested duplexure positive and negative busbar of described localization of fault instrument and straight-flow system is connected, the secondary signal collector adopts high-precision sensor, to straight-flow system input resolution up to 0.01mA, can accurately receive the ultra-low frequency signal of collection signal generator emission, ultra-low frequency signal is successively through signal amplifier, wave filter, the second analog to digital converter, signal processor, fault detection analysis device and the second liquid crystal display; The second liquid crystal display can realize that the waveform of tested duplexure shows simultaneously, impedance display, direction shows, described impedance display shows with the formal intuition of insulation index, described insulation index range is 0 ~ 100, personalized insulation index shows, the insulation degree that has intuitively shown detected branch road, the grading of can realizing insulating management, improve detection efficiency, intelligentized earth point direction shows, the position that can orient fast and accurately earth point in branch road, and described waveform shows can easily locate plus earth or minus earth; Find the earth fault signal if the fault detection analysis device detects, the instruction acousto-optic driver is reported to the police; High-precision sensor in the secondary signal collector, have high precision, good linearity, large-scale detectability, can realize to multipoint earthing the location of high resistance ground point.
As shown in Figure 3, during work, the first liquid crystal display of signal generator shows earth fault, the localization of fault instrument is accessed to the A point of tested duplexure, the localization of fault instrument shows normal, the trouble spot direction is shown as downwards, the localization of fault instrument is taken off from the A point, along fault display direction access B point, the localization of fault instrument shows that the B point impedance reduces, index<100 of insulating, numerical value is 30, direction is shown as upwards, waveform is shown as plus earth, from the B point, take off, continue to detect between A point and B point, finally determine the position of stake resistance Rx.If the insulation index is larger, be 90, illustrate that tested duplexure insulation degree is higher, if use passive type Grounded Fault Locator for DC System or secondary signal collector to use common sensor, can't realize the location to this high resistance ground point, and the utility model is highly sensitive, degree of accuracy is high, can realize the location to high resistance ground point.
As shown in Figure 4, many earth points fault detect principle, the first liquid crystal display of signal generator shows earth fault, the localization of fault instrument is accessed to the C point of tested duplexure, the localization of fault instrument shows normal, and the insulation index is 100, and the localization of fault instrument is taken off from the C point, access E point, the E point shows fault, and the insulation index is 50, illustrates between C point and E point trouble spot is arranged, continue to find, find the D point for trouble spot; Continuation, by localization of fault instrument access F point, finds that the F point shows fault, and the insulation index is 30, illustrates between E point and F point and also has trouble spot, needs to continue to find earth fault.
The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. a Portable direct current system earthing fault locating instrument, comprise: the signal generator independently separated and localization of fault instrument, it is characterized in that: described signal generator is connected with ground with straight-flow system major loop positive and negative busbar, described signal generator comprises the control system connected successively, signal generator, signal shaper, signal output device, the first signal collector, the first analog to digital converter and signal analyzer, described signal analyzer connects respectively the first liquid crystal display and described control system, described localization of fault instrument is connected with the tested duplexure positive and negative busbar of straight-flow system, described localization of fault instrument comprises the secondary signal collector connected successively, signal amplifier, wave filter, the second analog to digital converter, signal processor and fault detection analysis device, described fault detection analysis device connects respectively the second liquid crystal display and acousto-optic driver.
2. a kind of Portable direct current system earthing fault locating instrument according to claim 1, it is characterized in that: described signal generator emission ultra-low frequency signal, ultra-low frequency signal enters straight-flow system major loop and ground through described signal shaper and described signal output device, obtains the earth fault signal through described first signal collector, the first analog to digital converter, signal analyzer and the first liquid crystal display successively.
3. a kind of Portable direct current system earthing fault locating instrument according to claim 1 is characterized in that: it is the above sensor of 0.01mA that described secondary signal collector adopts resolution.
4. a kind of Portable direct current system earthing fault locating instrument according to claim 1, it is characterized in that: described localization of fault instrument is split-core type meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320423335 CN203365603U (en) | 2013-07-17 | 2013-07-17 | Portable direct-current system ground fault locating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320423335 CN203365603U (en) | 2013-07-17 | 2013-07-17 | Portable direct-current system ground fault locating device |
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| CN203365603U true CN203365603U (en) | 2013-12-25 |
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| CN 201320423335 Expired - Fee Related CN203365603U (en) | 2013-07-17 | 2013-07-17 | Portable direct-current system ground fault locating device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297624A (en) * | 2014-11-06 | 2015-01-21 | 国家电网公司 | Direct current ground fault detecting and handling method |
| 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 |
| CN105938175A (en) * | 2016-05-31 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DSP-based DC system instantaneous grounding online monitoring method and apparatus manufacture |
| CN107765131A (en) * | 2017-10-12 | 2018-03-06 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of earth-return circuit detecting system of transformer substation voltage whole station one point earth |
-
2013
- 2013-07-17 CN CN 201320423335 patent/CN203365603U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297624A (en) * | 2014-11-06 | 2015-01-21 | 国家电网公司 | Direct current ground fault detecting and handling method |
| 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 |
| CN105938175A (en) * | 2016-05-31 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DSP-based DC system instantaneous grounding online monitoring method and apparatus manufacture |
| CN105938175B (en) * | 2016-05-31 | 2019-03-12 | 贵阳英纳瑞电气有限公司 | Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP |
| CN107765131A (en) * | 2017-10-12 | 2018-03-06 | 中国南方电网有限责任公司超高压输电公司南宁局 | A kind of earth-return circuit detecting system of transformer substation voltage whole station one point earth |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee after: JIANGSU ELECTRIC POWER Co. Patentee after: State Grid Corporation of China Co-patentee after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. MAINTENANCE BRANCH Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee before: JIANGSU ELECTRIC POWER Co. Patentee before: State Grid Corporation of China Co-patentee before: MAINTENANCE DIVISION OF STATE GRID JIANGSU ELECTRIC POWER Co. Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee after: JIANGSU ELECTRIC POWER Co. Patentee after: State Grid Corporation of China Co-patentee after: MAINTENANCE DIVISION OF STATE GRID JIANGSU ELECTRIC POWER Co. Address before: 100761 West Chang'an Avenue, Beijing, No. 86, No. Co-patentee before: JIANGSU ELECTRIC POWER Co. Patentee before: State Grid Corporation of China Co-patentee before: JIANGSU ELECTRIC POWER COMPANY MAINTENANCE BRANCH |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20180717 |