CN201096855Y - Online tester for single-phase grounding failure of portable power cable - Google Patents
Online tester for single-phase grounding failure of portable power cable Download PDFInfo
- Publication number
- CN201096855Y CN201096855Y CNU2007200254408U CN200720025440U CN201096855Y CN 201096855 Y CN201096855 Y CN 201096855Y CN U2007200254408 U CNU2007200254408 U CN U2007200254408U CN 200720025440 U CN200720025440 U CN 200720025440U CN 201096855 Y CN201096855 Y CN 201096855Y
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- power cable
- button
- mutual inductor
- portable power
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Abstract
The utility model relates to a portable power cable single-phase grounding fault online detection instrument, which comprises a casing body, and a socket and a button arranged on a casing panel. The portable power cable single-phase grounding fault online detection instrument is characterized in that a detecting circuit is arranged inside the casing body, a mutual inductor retaining ring outside the casing body is connected with the detecting circuit through an input socket on the panel, the detecting circuit comprises a digital current meter, a power supply circuit, an amplifying circuit and a protection circuit, the output terminal of the mutual inductor retaining ring is connected with the input terminal of the digital current meter through the amplifying circuit and the protection circuit, and the power supply circuit is connected with the power input terminal of the digital current meter. According to the characteristic that the power cable has the 10 to 30 A grounding current after the single-phase grounding fault is generated, the mutual inductor retaining ring is adopted to collect the grounding fault current, and the grounding fault current is displayed through the digital current meter, and whether the tested branching cable customer is the grounding fault cable line is obtained according to the analysis to the fault current. The structure of the portable power cable single-phase grounding fault online detection instrument is simple, the customer power supply is not required to be interrupted, thereby reducing the work load of the overhaul personnel, and guaranteeing the personnel security.
Description
Technical field
The utility model relates to a kind of portable power cable singlephase earth fault on-line detector, belongs to power cable pick-up unit field.
Background technology
The singlephase earth fault incidence of power cable accounts for the significant proportion of cable fault.City net, upgrading of rural power grids cable laying in recent years uses length to increase greatly, and the thing followed is that the generation and the maintenance of power cable fault searches problem.How accurately, search the problem that cable fault has just become the power supply department growing interest rapidly, economically.
Article one, the power cable backbone has a lot of bar branch cable circuits.When singlephase earth fault took place, system can continue to move 2 hours, but the power cable singlephase earth fault very easily in time prolongation and develop into phase fault, cause trunk power cable line fault outage, influence electric power netting safe running.The existing conventional rough method of looking into, have a power failure exclusive method and the power failure remote measurement insulation resistance method one by one of asking, waste lot of manpower and material resources, caused very big electric quantity loss, be unfavorable for the stable of electric system, even when being to adopt above inquiry to look into means, cause the operator safety problem easily.
The utility model content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: portable power cable singlephase earth fault on-line detector a kind of simple in structure, safe in utilization is provided.
The technical scheme that its technical matters that solves the utility model adopts is: portable power cable singlephase earth fault on-line detector; comprise housing; case panel is provided with socket and button; it is characterized in that: enclosure interior is provided with testing circuit; the mutual inductor snap ring of outside is connected with testing circuit by the input socket on the panel; described testing circuit comprises digital ammeter; power circuit; amplifying circuit and holding circuit; the output terminal of mutual inductor snap ring is connected the input end of digital ammeter by amplifying circuit with holding circuit, power circuit connects the power input of digital ammeter.
Testing circuit and case panel adapt, and promptly the button on the case panel, socket and display aperture etc. are associated with testing circuit.
Wherein preferred version is:
On the wire of output terminal of described mutual inductor snap ring shading ring is set.To remove undesired signal, improve the signal degree of accuracy.
Described digital ammeter can adopt HX5135AC (500mA) type reometer.The precision height, scope is big.
Described mutual inductor snap ring adopts the big open type current transformer of 150mm.
Compared with prior art; the beneficial effect that the utility model portable power cable singlephase earth fault on-line detector is had is: according to the characteristic that the 10-30A ground current is arranged behind the power cable generation singlephase earth fault; by the testing circuit that adapts with the mutual inductor snap ring is set; mutual inductor snap ring sensed current signal; amplification protection and demonstration by testing circuit; the current conditions that detects the position can be judged intuitively, thereby the power cable singlephase earth fault can be judged.The utility model adopts the big open type current transformer of 150mm, carry out the collection of earth-fault current, input detecting circuit carries out processing and amplifying, judges relatively, show with digital ammeter, whether draw this test branch cable client according to the analysis to fault current, be the earth fault cable line.The utility model directly carries out collecting test one by one to client's branch cable, without broken clients power supply, thereby has reduced maintainer's workload, has guaranteed personal security.If the method for testing that adopts multiple devices to carry out or the electric current backbone is carried out segmentation simultaneously, can improve the work efficiency of searching the earth fault cable line greatly, thereby shorten earth fault working time, avoided the expansion of fault, guaranteed the safe operation of electrical network, improve power supply reliability, reduced the loss of delivery.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is a structural representation of the present utility model;
Fig. 1, the 2nd, most preferred embodiment of the present utility model, wherein, 1,6, socket 2,5, button 3, reometer gauge outfit 4, housing J1, mutual inductor snap ring P1, shading ring FU1, fuse B1, battery SB1, SB2, button U1, digital ammeter U2, amplifying circuit.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
As shown in Figure 1; testing circuit comprises digital ammeter U1, power circuit, amplifying circuit U2 and holding circuit; the output terminal of mutual inductor snap ring J1 passes through amplifying circuit U2 is connected digital ammeter U1 with holding circuit input end, and power circuit connects the power input of digital ammeter U1.On the wire of output terminal of mutual inductor snap ring J1 shading ring P1 is set.2 pin of digital ammeter and 3 pin ground connection.
Power circuit comprises battery B1 and button SB1, and button SB1 and battery B1 series connection is connected between 4 pin and 5 pin of power output end of digital ammeter U1 then.
Holding circuit comprises fuse FU1 and button SB2, and fuse FU1 and button SB2 are connected in parallel between 1 pin and 3 pin of input end end of digital ammeter U1.
Amplifying circuit U2 adopts the normal signal amplifying circuit to get final product.Mutual inductor snap ring J1 adopts the big open type current transformer of 150mm.Digital ammeter U1 can adopt the precision height, the HX5135AC that scope is big (500mA) type reometer.
During use, the button SB1 of closed power circuit, digital ammeter is started working.Mutual inductor snap ring J1 clamps cable under test, carry out the collection of earth-fault current, detection signal carries out processing and amplifying, judges relatively by amplifying circuit U2, show by digital ammeter U1, whether draw this test branch cable client according to the analysis to fault current, be the earth fault cable line.After being used to complete, close push button SB2 forms ground protection.
As shown in Figure 2, housing 4 panels are provided with socket 1,6, button 2,5 and breach, and breach is placed reometer gauge outfit 3, the i.e. display screen of digital ammeter U1.Housing 4 inside are provided with testing circuit.Testing circuit and housing 4 panels adapt, and be meant: socket 1 is set to the ground connection socket, is used for the ground connection of testing circuit.Socket 6 is set to import socket, is used to connect mutual inductor snap ring J1.Button 2 (being button SB2) is set to detection/protection button.Button 6 (being button SB1) is set to power switch button.
Claims (3)
1. portable power cable singlephase earth fault on-line detector; comprise housing; case panel is provided with socket and button; it is characterized in that: enclosure interior is provided with testing circuit; the mutual inductor snap ring of outside is connected with testing circuit by the input socket on the panel; described testing circuit comprises digital ammeter, power circuit, amplifying circuit and holding circuit; the output terminal of mutual inductor snap ring is connected the input end of digital ammeter by amplifying circuit with holding circuit, power circuit connects the power input of digital ammeter.
2. portable power cable singlephase earth fault on-line detector according to claim 1 is characterized in that on the wire of output terminal of described mutual inductor snap ring shading ring being set.
3. portable power cable singlephase earth fault on-line detector according to claim 1; it is characterized in that described power circuit comprises battery B1 and button SB1; button SB1 and battery B1 series connection; be connected then between 4 pin and 5 pin of power output end of digital ammeter U1; described holding circuit comprises fuse FU1 and button SB2; fuse FU1 and button SB2 are connected in parallel between 1 pin and 3 pin of input end of digital ammeter U1, and described amplifying circuit U2 adopts the normal signal amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200254408U CN201096855Y (en) | 2007-07-20 | 2007-07-20 | Online tester for single-phase grounding failure of portable power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200254408U CN201096855Y (en) | 2007-07-20 | 2007-07-20 | Online tester for single-phase grounding failure of portable power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096855Y true CN201096855Y (en) | 2008-08-06 |
Family
ID=39923908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200254408U Expired - Fee Related CN201096855Y (en) | 2007-07-20 | 2007-07-20 | Online tester for single-phase grounding failure of portable power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096855Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636721A (en) * | 2012-04-18 | 2012-08-15 | 孟州市电力公司 | Ground fault detector for power transmission line |
| CN102650670A (en) * | 2012-04-29 | 2012-08-29 | 沧州供电公司 | Multi-channel cable aligner |
| CN106646107A (en) * | 2016-10-13 | 2017-05-10 | 国网山东省电力公司章丘市供电公司 | Line grounding fault checking and detecting instrument |
| CN106998614A (en) * | 2017-06-12 | 2017-08-01 | 合肥光聚财建筑装饰工程有限公司 | A kind of the flicker accident analysis of household light fixture and control system based on controller |
-
2007
- 2007-07-20 CN CNU2007200254408U patent/CN201096855Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636721A (en) * | 2012-04-18 | 2012-08-15 | 孟州市电力公司 | Ground fault detector for power transmission line |
| CN102650670A (en) * | 2012-04-29 | 2012-08-29 | 沧州供电公司 | Multi-channel cable aligner |
| CN102650670B (en) * | 2012-04-29 | 2016-01-13 | 国家电网公司 | Multi-channel cable aligner |
| CN106646107A (en) * | 2016-10-13 | 2017-05-10 | 国网山东省电力公司章丘市供电公司 | Line grounding fault checking and detecting instrument |
| CN106998614A (en) * | 2017-06-12 | 2017-08-01 | 合肥光聚财建筑装饰工程有限公司 | A kind of the flicker accident analysis of household light fixture and control system based on controller |
| CN106998614B (en) * | 2017-06-12 | 2020-01-17 | 深圳市易安家居有限公司 | Household lamp flicker fault analysis and control system based on controller |
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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: 20080806 Termination date: 20100720 |