CN204256102U - Interchange is scurried into and grounding fault searching instrument - Google Patents
Interchange is scurried into and grounding fault searching instrument Download PDFInfo
- Publication number
- CN204256102U CN204256102U CN201420385342.5U CN201420385342U CN204256102U CN 204256102 U CN204256102 U CN 204256102U CN 201420385342 U CN201420385342 U CN 201420385342U CN 204256102 U CN204256102 U CN 204256102U
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- low frequency
- electric bridge
- interchange
- circuit
- frequency generator
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Abstract
The utility model provides a kind of interchange and scurries into and grounding fault searching instrument; comprise electric bridge and Signal Generator of Ultra-low Frequency; described electric bridge is connected with ground wire with straight-flow system positive and negative busbar by protection circuit with low frequency generator; described electric bridge is also connected liquid crystal display with low frequency generator, and the side of electric bridge and low frequency generator is provided with testing circuit.This is searched instrument and exchanges with complete positioning DC system and scurry into and earth fault, gets rid of the interference of on-the-spot distribution bulky capacitor, is locked in minimum zone like clockwork by fault zone, 110V, 220V straight-flow system shares a set of DC earthing detector.
Description
Technical field
The utility model relates to a kind of direct-current power supply earthing fault and interchange and scurries into direct current and search and provide applicable reliable high accuracy detection instrument with location.
Background technology
At present, the key problem that direct current searches is scurried in electric system direct-current power supply earthing fault and interchange is that on-the-spot interference is large.Measure under different direct supplys and different duties, anti-interference is poor, causes many products to survey erroneous judgement by mistake, and this is the disadvantage of these series of products, is also the most general phenomenon.
Utility model content
For above-mentioned defect and the problem of prior art, the utility model object there is provided a kind of highly sensitive, that antijamming capability is strong, volume is little, lightweight, easy to use JHCZ interchange and scurries into and grounding fault searching instrument.
In order to achieve the above object, the utility model provides following technical scheme:
A kind of interchange is scurried into and grounding fault searching instrument, comprise electric bridge and Signal Generator of Ultra-low Frequency, described electric bridge is connected with ground wire with straight-flow system positive and negative busbar by protection circuit with low frequency generator, described electric bridge is also connected liquid crystal display with low frequency generator, and the side of electric bridge and low frequency generator is provided with testing circuit;
Described testing circuit comprises detection probe, described detection probe is connected with amplifying circuit, described amplifying circuit is connected with bandwidth-limited circuit, described bandwidth-limited circuit is connected with phase shift difference channel, described phase shift difference channel is connected with rectifying and wave-filtering, described rectifying and wave-filtering and A/D model calling, described A/D module is connected with CPU, and described CPU connects thresholding setting, alarm output module and LCD MODULE.
Further, described A/D module also connects cell voltage module.
The beneficial effects of the utility model are, type Portable DC Earth Fault fault and interchange are scurried into direct current orientator (split type) and adopted sinusoidal signal phase place look ahead technology and the development and production of data batchmove algorithmic technique.This product is between online and portable two large types, and using method is portable, and performance is online.This instrument has the features such as detection sensitivity is high, antijamming capability is strong, volume is little, lightweight, easy to use.Search DC system grounding and interchange when scurrying into DC Line Fault, do not need deenergization, can be grounded a little and exchange and scurry into direct current location.Instrument can detect Grounding Resistance for Direct-Current System resistance, for searching of electric power DC system earth fault provides applicable reliable high accuracy detection instrument with location.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that interchange of the present utility model is scurried into and grounding fault searching instrument schematic diagram.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, be clearly and completely described the technical solution of the utility model, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, disclosed a kind of interchange of the utility model is scurried into and grounding fault searching instrument, comprise electric bridge and Signal Generator of Ultra-low Frequency, described electric bridge is connected with ground wire with straight-flow system positive and negative busbar by protection circuit with low frequency generator, described electric bridge is also connected liquid crystal display with low frequency generator, and the side of electric bridge and low frequency generator is provided with testing circuit;
Described testing circuit comprises detection probe, described detection probe is connected with amplifying circuit, described amplifying circuit is connected with bandwidth-limited circuit, described bandwidth-limited circuit is connected with phase shift difference channel, described phase shift difference channel is connected with rectifying and wave-filtering, described rectifying and wave-filtering and A/D model calling, described A/D module is connected with CPU, and described CPU connects thresholding setting, alarm output module and LCD MODULE;
Signal Generator of Ultra-low Frequency, produces the ultralow frequency sinusoidal signal of 1Hz, by protection circuit, injects straight-flow system over the ground by bus.Color screen display bus total voltage, positive voltage, negative voltage, positive resistance, negative resistance and signal curve.
Probing head is that this instrument signal receives and becomes the vitals that send, to be stuck on test line (can single line also can two-wire), to receive ground loop and cause ultralow frequency leakage current signal, and be transformed into voltage signal, send receiver to amplify and process.The detection probe of this instrument adopts the aperture of the caliper brake current transformer probing head of highly sensitive, the strong interference immunity newly succeeded in developing to be 14 × 18 (mm).
Interchange of the present utility model is scurried into and grounding fault searching instrument has following advantage:
1, this instrument sub-signal transmitter and signal receiver, sender unit (detecting busbar grounding resistance to use), directly from power taking bus, without the need to external AC power supply or battery charging, uses convenient.
2,110V, 220V straight-flow system shares a set of DC earthing detector.
3, the interchange of positioning DC system can scurry into and earth fault completely, get rid of the interference of on-the-spot distribution bulky capacitor, like clockwork fault zone is locked in minimum zone.
4, accuracy rate is measured: 100%.
5, output power signal: < 0.15W, inside establishes current-limiting protection, and on relay protection, automatically, operation circuit do not affect, use safety.
6, signal frequency degree of stability: ± 0.02HZ.
7, adopt the jaw of " heart " type design, large and small line shares, and need not change pliers.
8, can adapt to the ground connection that AC and DC crosstalk causes, ring network power supply ground connection, diode-isolated supplies electrical ground, high resistance ground.
9, need not install, need not have a power failure, need not insulation be shaken, just can quick and precisely find one or more earthing positions.
10, volume is little, lightweight, easy to carry, realizes a tractor serves several purposes function.
Principle is:
Signal Generator of Ultra-low Frequency, produces the ultralow frequency sinusoidal signal of 1Hz, by protection circuit, injects straight-flow system over the ground by bus.The effect of protection circuit is when bus has higher alternating voltage over the ground, and protection circuit starts, and disconnects ultra-low frequency signal and makes its not feed-in DC bus, and sender unit panel protection pilot lamp is bright, guarantees that Signal Generator of Ultra-low Frequency is not burnt.
When circuit there being earth fault, the marking current that ultra-low frequency signal sends forms current return through the electric current of test line and stake resistance and direct earth capacitance formation. and the current clamp be stuck on test line produces induction current, the impedance that faradic size and stake resistance and direct earth capacitance are formed is inversely proportional to. and this induction current is through amplifying, bandpass filtering, phase shift difference channel, filtering, A/D changes, carry out data processing through CPU, obtain grounding resistance, its value send crystal digital coding on the display to show.
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should described be as the criterion with the protection domain of claim.
Claims (2)
1. an interchange is scurried into and grounding fault searching instrument, comprise electric bridge and Signal Generator of Ultra-low Frequency, described electric bridge is connected with ground wire with straight-flow system positive and negative busbar by protection circuit with low frequency generator, described electric bridge is also connected liquid crystal display with low frequency generator, and the side of electric bridge and low frequency generator is provided with testing circuit;
Described testing circuit comprises detection probe, described detection probe is connected with amplifying circuit, described amplifying circuit is connected with bandwidth-limited circuit, described bandwidth-limited circuit is connected with phase shift difference channel, described phase shift difference channel is connected with rectifying and wave-filtering, described rectifying and wave-filtering and A/D model calling, described A/D module is connected with CPU, and described CPU connects thresholding setting, alarm output module and LCD MODULE.
2. interchange according to claim 1 is scurried into and grounding fault searching instrument, it is characterized in that, described A/D module also connects cell voltage module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420385342.5U CN204256102U (en) | 2014-07-14 | 2014-07-14 | Interchange is scurried into and grounding fault searching instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420385342.5U CN204256102U (en) | 2014-07-14 | 2014-07-14 | Interchange is scurried into and grounding fault searching instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204256102U true CN204256102U (en) | 2015-04-08 |
Family
ID=52960395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420385342.5U Expired - Fee Related CN204256102U (en) | 2014-07-14 | 2014-07-14 | Interchange is scurried into and grounding fault searching instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204256102U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403808A (en) * | 2015-11-12 | 2016-03-16 | 张烨 | DC line ground fault point locating method and device |
| CN105938167A (en) * | 2016-06-16 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DC system AC fleeing fault point positioning search apparatus and method |
| CN106546871A (en) * | 2015-09-18 | 2017-03-29 | 王明强 | Portable DC STS system test set |
-
2014
- 2014-07-14 CN CN201420385342.5U patent/CN204256102U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546871A (en) * | 2015-09-18 | 2017-03-29 | 王明强 | Portable DC STS system test set |
| CN105403808A (en) * | 2015-11-12 | 2016-03-16 | 张烨 | DC line ground fault point locating method and device |
| CN105403808B (en) * | 2015-11-12 | 2019-06-11 | 张烨 | A kind of localization method and device of DC line earth fault |
| CN105938167A (en) * | 2016-06-16 | 2016-09-14 | 贵阳英纳瑞电气有限公司 | DC system AC fleeing fault point positioning search apparatus and method |
| CN105938167B (en) * | 2016-06-16 | 2019-04-02 | 贵阳英纳瑞电气有限公司 | Direct current system exchange scurries into localization of fault and searches device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20150408 Termination date: 20170714 |