CN203069728U - Portable DC grounding system fault locator - Google Patents
Portable DC grounding system fault locator Download PDFInfo
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- CN203069728U CN203069728U CN 201320064160 CN201320064160U CN203069728U CN 203069728 U CN203069728 U CN 203069728U CN 201320064160 CN201320064160 CN 201320064160 CN 201320064160 U CN201320064160 U CN 201320064160U CN 203069728 U CN203069728 U CN 203069728U
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- low frequency
- system fault
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- 238000001514 detection method Methods 0.000 claims abstract description 22
- 239000000523 sample Substances 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
The utility model discloses a portable DC grounding system fault locator, which comprises an ultralow-frequency signal generator, wherein the ultralow-frequency signal is connected with a protective circuit, and is connected with a processor through an ultralow-frequency signal receiver, the processor is connected with a nixie display and an alarm, and the processor is further connected with a detection device. The portable DC grounding system fault locator can completely eliminate the grounding faults of DC systems and the interference of field distributed large capacitor, and can accurately lock the faults within a minimum range.
Description
Technical field
The utility model relates to a kind of grounding system fault orientator, relates in particular to a kind of Portable DC grounding system fault orientator.
Background technology
At present, the key problem of electric system direct-current power supply earthing troubleshooting is on-the-spot the interference greatly, under different direct supplys and different duty, measure, overwhelming majority product can be surveyed erroneous judgement by mistake, anti-interference is poor, overwhelming majority products all can't normally use, and this is the maximum characteristics of the sector, also are general phenomenon.
The utility model content
The purpose of this utility model is exactly to provide a kind of Portable DC grounding system fault orientator in order to address the above problem, and it has detection sensitivity height, antijamming capability is strong, volume is little, in light weight, easy to use advantage.
To achieve these goals, the utility model adopts following technical scheme:
A kind of Portable DC grounding system fault orientator; it comprises Signal Generator of Ultra-low Frequency, and Signal Generator of Ultra-low Frequency is connected with holding circuit, and is connected with processor by the ultra-low frequency signal receiver; processor is connected with alarm with nixie display, and processor also is connected with detection module.
Described detection module comprises detection probe, and detection probe is connected with processor through signal amplifier, bandpass filter, phase comparator, A/D converter successively.
The caliper brake current transformer that described detection probe is.
Described processor is single-chip microcomputer.
Signal Generator of Ultra-low Frequency, the ultralow frequency sinusoidal signal of generation by holding circuit, is injected straight-flow system over the ground by bus.The effect of holding circuit is when bus has higher alternating voltage over the ground, and holding circuit starts, and disconnects ultra-low frequency signal feed-in dc bus, guarantees that Signal Generator of Ultra-low Frequency is not burnt; When tested stake resistance during less than the thresholding value of setting, nixie display shows grounding resistance, and then processor sends alarm control signal, and the alarm lamp is bright.
Principle of work of the present utility model: Signal Generator of Ultra-low Frequency is positive and negative from the DC earthing systematic sampling, ground voltage and resistance signal, the ultra-low frequency signal receiver receives this signal, and send into processor and judge, whether normal, show normally if normally then control nixie display, any signal is not injected in system.If undesired, then needing to judge is positive ground connection or negative ground connection, if positive ground connection is just just and add a low current signal between the ground, if negative ground connection, just bear and ground between low current signal of adding.Detection probe is stuck in ultra-low frequency signal decanting point back, mobile backward along the line, search earth fault, and definite grounding fault point position, if search earth fault is arranged on the circuit, at this moment the ultra-low frequency signal that sends of Signal Generator of Ultra-low Frequency circuit and stake resistance and the direct earth capacitance of flowing through and being searched.Be stuck in the detection probe on the test line and produce induction current, the impedance that faradic size and stake resistance and direct earth capacitance constitute is inversely proportional to.Impedance is more little, and the induction current that detection probe produces is more big.This induction current amplifies through signal amplifier, band-pass filter, and phase comparator is handled, the A/D converter conversion, sends into processor and carries out the data processing, obtains grounding resistance and direct earth capacitance value.And send nixie display to show its numerical value.
The beneficial effects of the utility model: the utility model can be got rid of DC system earth fault fully, the interference of the on-the-spot big electric capacity that distributes, like clockwork with fault locking in minimum zone.
Description of drawings
Fig. 1 is system chart of the present utility model.
Wherein, 1. processor, 2. ultra-low frequency signal receiver, 3. Signal Generator of Ultra-low Frequency, 4. holding circuit, 5. nixie display, 6. alarm, 7. detection module, 8. signal amplifier, 9. bandpass filter, 10. phase comparator, 11.A/D converter.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1; a kind of Portable DC grounding system fault orientator; it comprises Signal Generator of Ultra-low Frequency 3; Signal Generator of Ultra-low Frequency 3 is connected with holding circuit 4; and be connected with processor 1 by ultra-low frequency signal receiver 2; processor 1 is connected with alarm 6 with nixie display 5, and processor 1 also is connected with detection module 7.
Described detection module 7 comprises detection probe, and detection probe is connected with processor 1 through signal amplifier 8, bandpass filter 9, phase comparator 10, A/D converter 11 successively.
The caliper brake current transformer that described detection probe is.
Described processor 1 is single-chip microcomputer.
Signal Generator of Ultra-low Frequency 3, the ultralow frequency sinusoidal signal of generation by holding circuit 4, is injected straight-flow system over the ground by bus.The effect of holding circuit 4 is when bus has higher alternating voltage over the ground, and holding circuit starts, and disconnects ultra-low frequency signal feed-in dc bus, guarantees that Signal Generator of Ultra-low Frequency 3 is not burnt; When tested stake resistance during less than the thresholding value of setting, nixie display 5 shows grounding resistances, and then processor 1 sends alarm control signal, and the alarm lamp is bright.
Principle of work of the present utility model: Signal Generator of Ultra-low Frequency 3 is positive and negative from the DC earthing systematic sampling, ground voltage and resistance signal, ultra-low frequency signal receiver 2 receives this signal, and send into processor 1 and judge, whether normal, show normally if normally then control nixie display 5, any signal is not injected in system.If undesired, then needing to judge is positive ground connection or negative ground connection, if positive ground connection is just just and add a low current signal between the ground, if negative ground connection, just bear and ground between low current signal of adding.Detection probe is stuck in ultra-low frequency signal decanting point back, mobile backward along the line, search earth fault, and definite grounding fault point position, if search earth fault is arranged on the circuit, at this moment the ultra-low frequency signal that sends of Signal Generator of Ultra-low Frequency 3 circuit and stake resistance and the direct earth capacitance of flowing through and being searched.Be stuck in the detection probe on the test line and produce induction current, the impedance that faradic size and stake resistance and direct earth capacitance constitute is inversely proportional to.Impedance is more little, and the induction current that detection probe produces is more big.This induction current amplifies through signal amplifier 8, bandpass filter 9 filtering, and phase comparator 10 is handled, A/D converter 11 conversions, sends into processor 1 and carries out the data processing, obtains grounding resistance and direct earth capacitance value.And send nixie display 5 to show its numerical value.
Though above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (4)
1. Portable DC grounding system fault orientator; it is characterized in that; it comprises Signal Generator of Ultra-low Frequency; Signal Generator of Ultra-low Frequency is connected with holding circuit; and be connected with processor by the ultra-low frequency signal receiver; processor is connected with alarm with nixie display, and processor also is connected with pick-up unit.
2. a kind of Portable DC grounding system fault orientator according to claim 1 is characterized in that described pick-up unit comprises detection probe, and detection probe is connected with processor through signal amplifier, bandpass filter, phase comparator, A/D converter successively.
3. as a kind of Portable DC grounding system fault orientator as described in the claim 2, it is characterized in that the caliper brake current transformer that described detection probe is.
4. a kind of Portable DC grounding system fault orientator according to claim 1 is characterized in that described processor is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320064160 CN203069728U (en) | 2013-02-05 | 2013-02-05 | Portable DC grounding system fault locator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320064160 CN203069728U (en) | 2013-02-05 | 2013-02-05 | Portable DC grounding system fault locator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203069728U true CN203069728U (en) | 2013-07-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320064160 Expired - Fee Related CN203069728U (en) | 2013-02-05 | 2013-02-05 | Portable DC grounding system fault locator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203069728U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675606A (en) * | 2013-12-07 | 2014-03-26 | 国家电网公司 | Bridge type direct-current fault monitoring alarm |
| CN103675613A (en) * | 2013-11-01 | 2014-03-26 | 国家电网公司 | Transformer station DC system movable type insulation supervision instrument |
| CN103823152A (en) * | 2014-03-11 | 2014-05-28 | 国家电网公司 | Direct-current grounding detection device |
| CN104297624A (en) * | 2014-11-06 | 2015-01-21 | 国家电网公司 | Direct current ground fault detecting and handling method |
| CN105486984A (en) * | 2016-01-04 | 2016-04-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Dynamic voltage source control-based direct-current grounding searching method and apparatus |
| CN105699845A (en) * | 2016-02-26 | 2016-06-22 | 方刚 | Power cable line-to-ground/electricity series fault point searching instrument of electrical device |
-
2013
- 2013-02-05 CN CN 201320064160 patent/CN203069728U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675613A (en) * | 2013-11-01 | 2014-03-26 | 国家电网公司 | Transformer station DC system movable type insulation supervision instrument |
| CN103675606A (en) * | 2013-12-07 | 2014-03-26 | 国家电网公司 | Bridge type direct-current fault monitoring alarm |
| CN103675606B (en) * | 2013-12-07 | 2016-08-17 | 国家电网公司 | Bridge-type DC Line Fault monitoring alarm |
| CN103823152A (en) * | 2014-03-11 | 2014-05-28 | 国家电网公司 | Direct-current grounding detection device |
| CN104297624A (en) * | 2014-11-06 | 2015-01-21 | 国家电网公司 | Direct current ground fault detecting and handling method |
| CN105486984A (en) * | 2016-01-04 | 2016-04-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Dynamic voltage source control-based direct-current grounding searching method and apparatus |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20140205 |