CN103605001B - A kind of electriferous state electric current secondary loop test coupling device - Google Patents
A kind of electriferous state electric current secondary loop test coupling device Download PDFInfo
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- CN103605001B CN103605001B CN201310649136.0A CN201310649136A CN103605001B CN 103605001 B CN103605001 B CN 103605001B CN 201310649136 A CN201310649136 A CN 201310649136A CN 103605001 B CN103605001 B CN 103605001B
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- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- 230000001939 inductive effect Effects 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Measurement Of Resistance Or Impedance (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention relates to a kind of electriferous state electric current secondary loop test coupling device, belong to power test technical field.Technical scheme is: comprise two electric current miniature inductive transformers, sample resistance (3), signal injection end (4) and output wiring terminal (5), the primary series of two electric current miniature inductive transformers connects, first electric current miniature inductive transformer (1) secondary by sample resistance and outlet terminal sub-connection, the secondary of second electric current miniature inductive transformer (2) is connected with signal injection end.Power consumption of the present invention is little, once be fixedly installed to on-the-spot secondary circuit, just can when not stirring electric current secondary terminal box, obtain the impedance characteristic of secondary loop of mutual inductor, effectively prevent secondary current open circuit hidden danger, both may be used for the interim test of field portable equipment, also can be connected with on-Line Monitor Device, realize long term state monitoring.The present invention may be used for the measurement of wider frequency range.
Description
Technical field
The present invention relates to a kind of electriferous state electric current secondary loop test coupling device, belong to power test technical field.
Background technology
Analog secondary loop of mutual inductor electric current directly affects metering, protection and the key parameter of measurement mechanism accuracy.But, because the needs of site examining and repairing, often need by secondary terminal box switch by charged for testing apparatus access, to obtain current parameters; Or inject test signal by secondary terminal box to secondary circuit, to play objects such as secondary circuit status monitoring, current mulual inductor malfunction detection or the charged displacements of electric energy meter.The above-mentioned way of background technology; because access secondary terminal box can cause open circuit dangerous usually, if namely terminal board switch short brace is not stirred and put in place, open circuit of secondary loop of current transformer may be caused; produce high pressure, bring hazard to person to secondary circuit electrical equipment or field service personnel.
Summary of the invention
The object of the invention is to propose a kind of electriferous state electric current secondary loop test coupling device, maintainer can when without the need to by Obtaining Accurate secondary current when testing apparatus series connection access secondary circuit, or secondary circuit injection test current signal etc. can be given when without the need to stirring terminal board scribing switch, solve the problems referred to above that background technology exists.
Technical solution of the present invention is: a kind of electriferous state electric current secondary loop test coupling device, comprise two electric current miniature inductive transformers, sample resistance, signal injection end and output wiring terminals, the primary series of two electric current miniature inductive transformers connects, first electric current miniature inductive transformer secondary by sample resistance and outlet terminal sub-connection, the secondary of second electric current miniature inductive transformer is connected with signal injection end.
Normal power current is flow through by two electric current miniature inductive primary, armature winding normal DC resistance is less than 0.1 ohm, very little to the load effect of electric current secondary loop, negligible, the electric current of electric current miniature inductive transformer is comparatively large, can be referred to as heavy-current micro sensor transformer; Two electric current miniature inductive transformers are served as respectively and are obtained function of current and signal injection function, wherein, first electric current miniature inductive transformer is as electric current Acquisition channel, the secondary parallel sample resistance of this electric current miniature inductive transformer, convert current signal to voltage signal, access for follow-up signal measuring equipment; Second electric current miniature inductive transformer is as signal injection end, elementary with secondary power frequency current-series, and secondary is port access, is connected with signal injection end; Because the power or voltage that pass through second electric current miniature inductive transformer signal injection end by external monitoring or can measure acquisition, the loop current injected can be obtained by the secondary winding of first electric current miniature inductive transformer, therefore power and the loop circuit impedance of whole secondary loop of mutual inductor is injected, can calculate according to Ohm law, thus obtain the resistance value of whole secondary circuit.
For preventing test Injection Signal too high, interference is formed to secondary current loop, or prevent mishap from causing electric current miniature inductive transformer coil high temperature to blow, the present invention also comprises the two-way clamping circuit of tape light function, and the primary series of two electric current miniature inductive transformers connects rear and two-way clamper circuit in parallel; Two-way clamping circuit is by the amplitude range of two electric current miniature inductive primary clampers in setting, the voltage that the clamper value of two-way clamping circuit is formed higher than normal stream excess current miniature inductive primary, only have when electric current miniature inductive Transformer Winding open circuit, electric current secondary loop just can form loop through two-way clamping circuit, thus trigger pilot lamp work, namely this pilot lamp plays the effect of automatic alarm.
In addition, the present invention can be designed into current transformer inside, also can be installed in secondary loop of mutual inductor with standard terminals cassette in series; Can also be integrated with standard terminals box, form composite multifunction terminal board.
Beneficial effect of the present invention: power consumption of the present invention is little, once be fixedly installed to on-the-spot secondary circuit, just can when not stirring electric current secondary terminal box, obtain the impedance characteristic of secondary loop of mutual inductor, therefore effectively prevent secondary current open circuit hidden danger, both may be used for the interim test of field portable equipment, also can be connected with on-Line Monitor Device, realize long term state monitoring.Because electric current miniature inductive transformer can pass through high frequency magnetic core coiling, therefore the present invention may be used for the measurement of wider frequency range, if tens of Hertz is to the measurement of hundreds of KHz.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structural representation;
In figure: first electric current miniature inductive transformer 1, second electric current miniature inductive transformer 2, sample resistance 3, signal injection end 4, output wiring terminal 5, two-way clamping circuit 6.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further:
A kind of electriferous state electric current secondary loop test coupling device, comprise two electric current miniature inductive transformers, sample resistance 3, signal injection end 4 and output wiring terminals 5, the primary series of two electric current miniature inductive transformers connects, first electric current miniature inductive transformer 1 secondary by sample resistance and outlet terminal sub-connection, the secondary of second electric current miniature inductive transformer 2 is connected with signal injection end.
Normal power current is flow through by two electric current miniature inductive primary, armature winding normal DC resistance is less than 0.1 ohm, very little to the load effect of electric current secondary loop, negligible, the electric current of electric current miniature inductive transformer is comparatively large, can be referred to as heavy-current micro sensor transformer; Two electric current miniature inductive transformers are served as respectively and are obtained function of current and signal injection function, wherein, first electric current miniature inductive transformer is as electric current Acquisition channel, the secondary parallel sample resistance of this electric current miniature inductive transformer, convert current signal to voltage signal, access for follow-up signal measuring equipment; Second electric current miniature inductive transformer is as signal injection end, elementary with secondary power frequency current-series, and secondary is port access, is connected with signal injection end; Because the power or voltage that pass through second electric current miniature inductive transformer signal injection end by external monitoring or can measure acquisition, the loop current injected can be obtained by the secondary winding of first electric current miniature inductive transformer, therefore power and the loop circuit impedance of whole secondary loop of mutual inductor is injected, can calculate according to Ohm law, thus obtain the resistance value of whole secondary circuit.
For preventing test Injection Signal too high, interference is formed to secondary current loop, or prevent mishap from causing electric current miniature inductive transformer coil high temperature to blow, the primary series that the present invention also comprises two-way clamping circuit 6, two electric current miniature inductive transformers of tape light function connects rear and two-way clamper circuit in parallel; Two-way clamping circuit is by the amplitude range of two electric current miniature inductive primary clampers in setting, the voltage that the clamper value of two-way clamping circuit is formed higher than normal stream excess current miniature inductive primary, only have when electric current miniature inductive Transformer Winding open circuit, electric current secondary loop just can form loop through two-way clamping circuit, thus trigger pilot lamp work, namely this pilot lamp plays the effect of automatic alarm.
The present invention be installed in secondary loop of mutual inductor with standard terminals cassette in series; Or integrated with standard terminals box, form composite multifunction terminal board.
Claims (2)
1. an electriferous state electric current secondary loop test coupling device, it is characterized in that comprising two electric current miniature inductive transformers, sample resistance (3), signal injection end (4) and output wiring terminal (5), the primary series of two electric current miniature inductive transformers connects, first electric current miniature inductive transformer (1) secondary by sample resistance and outlet terminal sub-connection, the secondary of second electric current miniature inductive transformer (2) is connected with signal injection end;
Two electric current miniature inductive transformers are served as respectively and are obtained function of current and signal injection function, wherein, first electric current miniature inductive transformer is as electric current Acquisition channel, the secondary parallel sample resistance of this electric current miniature inductive transformer, convert current signal to voltage signal, access for follow-up signal measuring equipment; Second electric current miniature inductive transformer is as signal injection end, elementary with secondary power frequency current-series, and secondary is port access, is connected with signal injection end; Because the power or voltage that pass through second electric current miniature inductive transformer signal injection end are obtained by external monitoring or measurement, the loop current injected is obtained by the secondary winding of first electric current miniature inductive transformer, therefore power and the loop circuit impedance of whole secondary loop of mutual inductor is injected, calculate according to Ohm law, thus obtain the resistance value of whole secondary circuit.
2. a kind of electriferous state electric current secondary loop test coupling device according to claim 1, characterized by further comprising the two-way clamping circuit (6) of tape light function, the primary series of two electric current miniature inductive transformers connects rear and two-way clamper circuit in parallel; Two-way clamping circuit is by the amplitude range of two electric current miniature inductive primary clampers in setting, the voltage that the clamper value of two-way clamping circuit is formed higher than normal stream excess current miniature inductive primary, only have when electric current miniature inductive Transformer Winding open circuit, electric current secondary loop just can form loop through two-way clamping circuit, thus trigger pilot lamp work, namely this pilot lamp plays the effect of automatic alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310649136.0A CN103605001B (en) | 2013-12-06 | 2013-12-06 | A kind of electriferous state electric current secondary loop test coupling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310649136.0A CN103605001B (en) | 2013-12-06 | 2013-12-06 | A kind of electriferous state electric current secondary loop test coupling device |
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| Publication Number | Publication Date |
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| CN103605001A CN103605001A (en) | 2014-02-26 |
| CN103605001B true CN103605001B (en) | 2015-12-30 |
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| CN201310649136.0A Active CN103605001B (en) | 2013-12-06 | 2013-12-06 | A kind of electriferous state electric current secondary loop test coupling device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977497B (en) * | 2015-06-16 | 2018-12-21 | 陈劲游 | Volt-ampere phase meter for checking wiring in case of power failure or electrification |
| CN108957140B (en) * | 2018-07-02 | 2022-07-01 | 中国电力科学研究院有限公司 | Loop impedance measurement system and method with wide dynamic range |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4739248A (en) * | 1986-04-30 | 1988-04-19 | Westinghouse Electric Corp. | Current transformer circuit tester |
| DE3812633A1 (en) * | 1988-04-15 | 1989-10-26 | Daimler Benz Ag | METHOD FOR CONTACTLESS RESISTANCE MEASUREMENT |
| CN102087347B (en) * | 2009-12-08 | 2013-05-29 | 张建 | Charged test method for current transformer and application thereof |
| CN202486254U (en) * | 2012-03-14 | 2012-10-10 | 山西省电力公司电力科学研究院 | Secondary circuit detection system of current mutual inductor |
| CN202975222U (en) * | 2012-11-28 | 2013-06-05 | 沧州供电公司 | Integrated tester for secondary circuit of current transformer |
| CN102944810B (en) * | 2012-12-12 | 2015-02-18 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
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