CN202600093U - DC earthing point detector for electrical network line - Google Patents
DC earthing point detector for electrical network line Download PDFInfo
- Publication number
- CN202600093U CN202600093U CN 201220133834 CN201220133834U CN202600093U CN 202600093 U CN202600093 U CN 202600093U CN 201220133834 CN201220133834 CN 201220133834 CN 201220133834 U CN201220133834 U CN 201220133834U CN 202600093 U CN202600093 U CN 202600093U
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- Prior art keywords
- network line
- earthing
- power network
- electrical network
- signal source
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Measurement Of Resistance Or Impedance (AREA)
- Locating Faults (AREA)
Abstract
The utility model relates to a DC earthing point detector for an electrical network line. The DC earthing point detector for an electrical network line comprises a signal source, a hand-held detector and a detecting clamp. One end of the signal source is connected to the earth, the other end is connected to the earthing bus of the electrical network line, and the detecting clamp is respectively connected to the earthing bus of the electrical network line and the hand-held detector. Compared to the prior art, the DC earthing point detector for an electrical network line is convenient to carry and use, the power source of the DC electrical network circuit is not required to be broken off, an earthing fault can be searched with power on, the searching speed of a DC earthing fault is greatly raised, an earthing fault can be positioned to a specific point, the operation is simple, and the detection precision is high.
Description
Technical field
The utility model relates to a kind of electric network fault pick-up unit, especially relates to a kind of power network line DC earthing point sniffer.
Background technology
Constantly perfect along with China's electric system, the coverage rate of whole electric power networks is increasing, and it is complicated more that the dc system grounding technology also becomes, and the stability of its operation always is the problem that the technician pays close attention to.Transformer station direct current system is with the battery stores energy, and with the charging set makeup energy, Xiang Quanzhan protection, monitoring, communication system provide uninterrupted power source, guarantees its safety, stable, reliability service.Positive and negative electrode is insulation over the ground under the normal condition, and when one point earth took place, the positive and negative electrode voltage-to-ground changed; The earthing pole voltage-to-ground reduces, and non-earthing pole voltage raises, and power supply reliability reduces greatly; Because second ground connection is taken place again, very easily cause direct-current short circuit and switch malfunction, tripping, so during direct current single-point grounding when earth point is not eliminated; Though equipment can continue operation, earth point must be found as early as possible, eliminates immediately or isolation.
The utility model content
The purpose of the utility model is exactly to provide a kind of detection accurately, fast for the defective that overcomes above-mentioned prior art existence, power network line DC earthing point sniffer simple to operate.
The purpose of the utility model can realize through following technical scheme:
A kind of power network line DC earthing point sniffer; Comprise signal source, hand-held measuring appliance and detection pincers; One end ground connection of described signal source, the other end connects the ground strap of power network line, and described detection pincers are connected with the ground strap and the hand-held measuring appliance of power network line respectively.
The jaw of described detection pincers is circular arc jaw or duck jaw.
Described hand-held measuring appliance comprises the display screen that is used for stake resistance and electric current.
Described hand-held measuring appliance is equipped with insulation sleeve with surveying to clamp.
Described signal source is the ultra-low frequency signal source.
Compared with prior art; The utility model portably uses more convenient, when test, need not to break off electrical network DC loop power supply, can chargedly search DC ground fault; Greatly improved the speed of searching DC ground fault; And this device can navigate to concrete point with earth fault, and is simple to operate, and accuracy of detection is high.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1; A kind of power network line DC earthing point sniffer comprises signal source 1, hand-held measuring appliance 2 and surveys pincers 3, an end ground connection of signal source 1; The other end connects the ground strap 4 of power network line, surveys pincers 3 and is connected with the ground strap 4 and the hand-held measuring appliance 2 of power network line respectively.
Wherein, the jaw of surveying pincers 3 is circular arc jaw or duck jaw, and the front end of circular arc jaw can be used for pressing from both sides terminal line, and middle arc sections can be used for pressing from both sides cable, and the duck jaw can be used for pressing from both sides less terminal line.Signal source is the ultra-low frequency signal source; Can avoid influence to grid equipment; Hand-held measuring appliance 2 has comprised a display screen, can be used to show stake resistance and the electric current of surveying ground strap 4 places that pincers 3 are connected, in addition; Hand-held measuring appliance 2 is equipped with insulation sleeve, the security in the time of can improving operation with detection pincers 3.
The testing process of this sniffer is: at first; The enabling signal source applies a ultra-low frequency signal between ground strap and the earth; Its electric current flows along the earth point direction, touches the ground bus with the detection cramp joint that is connected on the hand-held measuring appliance then, and searches successively along sense of current; When electric current suddenly disappears or stake resistance when increasing suddenly, this point is earth point.
Claims (5)
1. power network line DC earthing point sniffer; It is characterized in that; Comprise signal source, hand-held measuring appliance and detection pincers; One end ground connection of described signal source, the other end connects the ground strap of power network line, and described detection pincers are connected with the ground strap and the hand-held measuring appliance of power network line respectively.
2. a kind of power network line DC earthing point sniffer according to claim 1 is characterized in that, the jaw of described detection pincers is circular arc jaw or duck jaw.
3. a kind of power network line DC earthing point sniffer according to claim 1 is characterized in that described hand-held measuring appliance comprises the display screen that is used for stake resistance and electric current.
4. a kind of power network line DC earthing point sniffer according to claim 1 is characterized in that, described hand-held measuring appliance is equipped with insulation sleeve with surveying to clamp.
5. a kind of power network line DC earthing point sniffer according to claim 1 is characterized in that described signal source is the ultra-low frequency signal source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220133834 CN202600093U (en) | 2012-03-31 | 2012-03-31 | DC earthing point detector for electrical network line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220133834 CN202600093U (en) | 2012-03-31 | 2012-03-31 | DC earthing point detector for electrical network line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202600093U true CN202600093U (en) | 2012-12-12 |
Family
ID=47317624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220133834 Expired - Lifetime CN202600093U (en) | 2012-03-31 | 2012-03-31 | DC earthing point detector for electrical network line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202600093U (en) |
Cited By (3)
| 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 |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN112816829A (en) * | 2020-07-01 | 2021-05-18 | 广东电网有限责任公司揭阳供电局 | Fault positioning analysis device and method |
-
2012
- 2012-03-31 CN CN 201220133834 patent/CN202600093U/en not_active Expired - Lifetime
Cited By (5)
| 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 |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
| CN112816829A (en) * | 2020-07-01 | 2021-05-18 | 广东电网有限责任公司揭阳供电局 | Fault positioning analysis device and method |
| CN112816829B (en) * | 2020-07-01 | 2023-07-14 | 广东电网有限责任公司揭阳供电局 | Analysis device and analysis method for fault positioning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
|
| CX01 | Expiry of patent term |