CN203572882U - Live-line current secondary circuit test coupling device - Google Patents
Live-line current secondary circuit test coupling device Download PDFInfo
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- CN203572882U CN203572882U CN201320796635.8U CN201320796635U CN203572882U CN 203572882 U CN203572882 U CN 203572882U CN 201320796635 U CN201320796635 U CN 201320796635U CN 203572882 U CN203572882 U CN 203572882U
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- secondary circuit
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- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 230000001939 inductive effect Effects 0.000 claims description 42
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 4
- 238000005070 sampling Methods 0.000 abstract 2
- 230000005611 electricity Effects 0.000 abstract 1
- 238000012806 monitoring device Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram 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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Abstract
The utility model relates to a live-line current secondary circuit test coupling device, and belongs to the technical field of electric power tests. The technical scheme is that the live-line current secondary circuit test coupling device comprises two current minisize induction transformers, a sampling resistor (3), a signal injection terminal (4) and an output wiring terminal (5), primary parts of the two current minisize induction transformers are connected in series, a secondary part of the first current minisize induction transformer (1) is connected with the output wiring terminal through the sampling resistor, and a secondary part of the second current minisize induction transformer (2) is connected with the signal injection terminal. The live-line current secondary circuit test coupling device is few in electricity consumption, once the live-line current secondary circuit test coupling device is fixedly installed in an on-site secondary circuit, impedance characteristics of the secondary circuit of a current transformer are obtained under the condition that a current secondary terminal box is not dialed, and open circuit hidden troubles of the secondary current are effectively avoided, The live-line current secondary circuit test coupling device not only can be used for temporary tests of on-site portable instruments, but also can be connected with an on-line monitoring device, and long-term state monitoring is achieved. The live-line current secondary circuit test coupling device can be used for measurement in a relatively wide frequency scope.
Description
Technical field
The utility model relates to a kind of electriferous state electric current secondary loop test coupling device, belongs 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 charged testing apparatus access, 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.
Utility model content
The purpose of this utility model 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 solutions of the utility model are: 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; Owing to can being obtained by external monitoring or measurement by power or the voltage of second electric current miniature inductive transformer signal injection end, 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 utility model 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 utility model 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.
The beneficial effects of the utility model: the utility model power consumption 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, for the interim test of on-the-spot portable set, also can be connected with on-Line Monitor Device, realize long-term status monitoring.Because electric current miniature inductive transformer can pass through high frequency magnetic core coiling, therefore the utility model can be for the measurement of wider frequency range, as tens of hertz to the measurement of hundreds of KHz.
Accompanying drawing explanation
Fig. 1 is the utility model example structure schematic diagram;
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 utility model 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; Owing to can being obtained by external monitoring or measurement by power or the voltage of second electric current miniature inductive transformer signal injection end, 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 utility model 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 utility model 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 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), 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.
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, in parallel with two-way clamping circuit after elementary being connected in series of two electric current miniature inductive transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320796635.8U CN203572882U (en) | 2013-12-06 | 2013-12-06 | Live-line current secondary circuit test coupling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320796635.8U CN203572882U (en) | 2013-12-06 | 2013-12-06 | Live-line current secondary circuit test coupling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203572882U true CN203572882U (en) | 2014-04-30 |
Family
ID=50540609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320796635.8U Expired - Fee Related CN203572882U (en) | 2013-12-06 | 2013-12-06 | Live-line current secondary circuit test coupling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203572882U (en) |
-
2013
- 2013-12-06 CN CN201320796635.8U patent/CN203572882U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20140430 Termination date: 20181206 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |