CN103605001A - Charged-state current secondary circuit test coupling device - Google Patents
Charged-state current secondary circuit test coupling device Download PDFInfo
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- CN103605001A CN103605001A CN201310649136.0A CN201310649136A CN103605001A CN 103605001 A CN103605001 A CN 103605001A CN 201310649136 A CN201310649136 A CN 201310649136A CN 103605001 A CN103605001 A CN 103605001A
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Abstract
The invention relates to a charged-state current secondary circuit test coupling device and belongs to the technical field of electric power test. The technical scheme is as follows: the charged-state current secondary circuit test coupling device comprises two current micro sensing transformers, a sampling resistor (3), a signal charging end (4) and an output connecting terminal (5), wherein primary coils of the two current micro sensing transformers are serially connected with each other, a secondary coil of a first current micro sensing transformer (1) is connected with the output connecting terminal through the sampling resistor, and a secondary coil of a second current micro sensing transformer (2) is connected with the signal charging end. The charged-state current secondary circuit test coupling device is small in power consumption, the impedance characteristics of a secondary circuit of the current transformer can be obtained under the situation that a current secondary terminal box is not shifted once the charged-state current secondary circuit test coupling device is installed to an in-situ secondary circuit, and the open-circuit potential danger of the secondary circuit can be effectively avoided. The charged-state current secondary circuit test coupling device not only can be used for temporarily testing an in-situ portable device, but also can be connected with an online monitoring device so as to realize the long-term state monitoring. The charged-state current secondary circuit test coupling device can be used for measuring a wide 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 is the key parameter that directly affects metering, protection and measurement mechanism accuracy.But, because the needs of site examining and repairing, often need to be by secondary terminal box switch by the charged access of testing apparatus, to obtain current parameters; Or to secondary circuit, inject test signal by secondary terminal box, 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 conventionally, if terminal board switch short circuit brace is not stirred and put in place, may cause open circuit of secondary loop of current transformer; 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 have proposed a kind of electriferous state electric current secondary loop test coupling device, maintainer can be at Obtaining Accurate secondary current without by testing apparatus series connection access secondary circuit in the situation that, or can, giving secondary circuit injection test current signal etc. without stir terminal board scribing switch in the situation that, 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, elementary being connected in series of two electric current miniature inductive transformers, first electric current miniature inductive transformer secondary by sample resistance and outlet terminal sub-connection, the secondary and signal injection end of second electric current miniature inductive transformer is connected.
Normal power current flows through by two electric current miniature inductive primary, the normal direct current resistance of armature winding is less than 0.1 ohm, load effect to electric current secondary loop is very little, negligible, the electric current of electric current miniature inductive transformer is larger, 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 sample resistance secondary in parallel of this electric current miniature inductive transformer, convert current signal to voltage signal, for the access of follow-up signal measuring equipment; Second electric current miniature inductive transformer be as signal injection end, and elementary and secondary power frequency current-series are secondary for port accesses, and are connected with signal injection end; Because power or voltage by second electric current miniature inductive transformer signal injection end can be obtained by external monitoring or measurement, the loop current of injecting can be obtained by the secondary winding of first electric current miniature inductive transformer, therefore inject power and the loop circuit impedance of whole secondary loop of mutual inductor, can calculate according to Ohm law, thereby obtain the resistance value of whole secondary circuit.
Too high for preventing testing Injection Signal, secondary current loop is formed and disturbed, or prevent that 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, in parallel with two-way clamping circuit after elementary being connected in series of two electric current miniature inductive transformers; The amplitude range that two-way clamping circuit is being set two electric current miniature inductive primary clampers, the voltage that the clamper value of two-way clamping circuit forms higher than normal current flowing 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, thereby trigger pilot lamp work, 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 and standard terminal cassette in series; Can also be integrated with standard terminal board, 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 be in the situation that not stirring electric current secondary terminal box, obtain the impedance characteristic of secondary loop of mutual inductor, therefore effectively avoided secondary current open circuit hidden danger, both can also can be connected with on-Line Monitor Device for the interim test of on-the-spot portable set, realize long-term status monitoring.Because electric current miniature inductive transformer can pass through high frequency magnetic core coiling, so the present invention can be for the measurement of wider frequency range, as the tens of hertz of measurements to 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, elementary being connected in series of two electric current miniature inductive transformers, first electric current miniature inductive transformer 1 secondary by sample resistance and outlet terminal sub-connection, the secondary and signal injection end of second electric current miniature inductive transformer 2 is connected.
Normal power current flows through by two electric current miniature inductive primary, the normal direct current resistance of armature winding is less than 0.1 ohm, load effect to electric current secondary loop is very little, negligible, the electric current of electric current miniature inductive transformer is larger, 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 sample resistance secondary in parallel of this electric current miniature inductive transformer, convert current signal to voltage signal, for the access of follow-up signal measuring equipment; Second electric current miniature inductive transformer be as signal injection end, and elementary and secondary power frequency current-series are secondary for port accesses, and are connected with signal injection end; Because power or voltage by second electric current miniature inductive transformer signal injection end can be obtained by external monitoring or measurement, the loop current of injecting can be obtained by the secondary winding of first electric current miniature inductive transformer, therefore inject power and the loop circuit impedance of whole secondary loop of mutual inductor, can calculate according to Ohm law, thereby obtain the resistance value of whole secondary circuit.
Too high for preventing testing Injection Signal, secondary current loop is formed and disturbed, or prevent that mishap from causing electric current miniature inductive transformer coil high temperature to blow, the present invention also comprises that 6, two electric current miniature inductive transformers of two-way clamping circuit elementary of tape light function is in parallel with two-way clamping circuit after being connected in series; The amplitude range that two-way clamping circuit is being set two electric current miniature inductive primary clampers, the voltage that the clamper value of two-way clamping circuit forms higher than normal current flowing 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, thereby trigger pilot lamp work, this pilot lamp plays the effect of automatic alarm.
The present invention is installed in secondary loop of mutual inductor and standard terminal cassette in series; Or integrated with standard terminal board, form composite multifunction terminal board.
Claims (2)
1. an electriferous state electric current secondary loop is tested 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), elementary being connected in series of two electric current miniature inductive transformers, first electric current miniature inductive transformer (1) secondary by sample resistance and outlet terminal sub-connection, the secondary and signal injection end of second electric current miniature inductive transformer (2) is connected;
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 sample resistance secondary in parallel of this electric current miniature inductive transformer, convert current signal to voltage signal, for the access of follow-up signal measuring equipment; Second electric current miniature inductive transformer be as signal injection end, and elementary and secondary power frequency current-series are secondary for port accesses, and are connected with signal injection end; Because power or voltage by second electric current miniature inductive transformer signal injection end can be obtained by external monitoring or measurement, the loop current of injecting can be obtained by the secondary winding of first electric current miniature inductive transformer, therefore inject power and the loop circuit impedance of whole secondary loop of mutual inductor, according to Ohm law, calculate, thereby obtain the resistance value of whole secondary circuit.
2. a kind of electriferous state electric current secondary loop according to claim 1 is tested coupling device, characterized by further comprising the two-way clamping circuit (6) of tape light function, in parallel with two-way clamping circuit after elementary being connected in series of two electric current miniature inductive transformers; The amplitude range that two-way clamping circuit is being set two electric current miniature inductive primary clampers, the voltage that the clamper value of two-way clamping circuit forms higher than normal current flowing 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, thereby trigger pilot lamp work, 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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| CN103605001A true CN103605001A (en) | 2014-02-26 |
| CN103605001B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977497A (en) * | 2015-06-16 | 2015-10-14 | 陈劲游 | Volt-ampere phase meter for checking wiring in case of power failure or electrification |
| CN108957140A (en) * | 2018-07-02 | 2018-12-07 | 中国电力科学研究院有限公司 | A kind of impedance measurement circuit system and method for wide dynamic range |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4739248A (en) * | 1986-04-30 | 1988-04-19 | Westinghouse Electric Corp. | Current transformer circuit tester |
| US4973912A (en) * | 1988-04-15 | 1990-11-27 | Daimler-Benz Aktiengesellschaft | Method for contactless measurement of a resistance arranged in the secondary circuit of a transformer and device for carrying out the method |
| CN102087347A (en) * | 2009-12-08 | 2011-06-08 | 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 |
| CN102944810A (en) * | 2012-12-12 | 2013-02-27 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
| CN202975222U (en) * | 2012-11-28 | 2013-06-05 | 沧州供电公司 | Integrated tester for secondary circuit of current transformer |
-
2013
- 2013-12-06 CN CN201310649136.0A patent/CN103605001B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4739248A (en) * | 1986-04-30 | 1988-04-19 | Westinghouse Electric Corp. | Current transformer circuit tester |
| US4973912A (en) * | 1988-04-15 | 1990-11-27 | Daimler-Benz Aktiengesellschaft | Method for contactless measurement of a resistance arranged in the secondary circuit of a transformer and device for carrying out the method |
| CN102087347A (en) * | 2009-12-08 | 2011-06-08 | 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 |
| CN102944810A (en) * | 2012-12-12 | 2013-02-27 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977497A (en) * | 2015-06-16 | 2015-10-14 | 陈劲游 | Volt-ampere phase meter for checking wiring in case of power failure or electrification |
| CN108957140A (en) * | 2018-07-02 | 2018-12-07 | 中国电力科学研究院有限公司 | A kind of impedance measurement circuit system and method for wide dynamic range |
| 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 |
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| CN103605001B (en) | 2015-12-30 |
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