CN203659568U - Electromagnetic current transformer demagnetization device - Google Patents
Electromagnetic current transformer demagnetization device Download PDFInfo
- Publication number
- CN203659568U CN203659568U CN201320696645.4U CN201320696645U CN203659568U CN 203659568 U CN203659568 U CN 203659568U CN 201320696645 U CN201320696645 U CN 201320696645U CN 203659568 U CN203659568 U CN 203659568U
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- current transformer
- demagnetization
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- 230000005347 demagnetization Effects 0.000 title abstract description 24
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000003325 tomography Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000005389 magnetism Effects 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model discloses an electromagnetic current transformer demagnetization device. The electromagnetic current transformer demagnetization device is characterized by comprising a detecting unit and an access device electrically connected with the detecting unit, wherein the access device is electrically connected with a load and a current transformer. According to the electromagnetic current transformer demagnetization device, the testing time, manual labor and cost are efficiently saved, the on-line demagnetization technology without black out is achieved, the complexity in operation and potential risks are greatly reduced; as the test signal is low, the normal work of the CT(Computerized Tomography) is not affected; as the high test current and high-power supply in the background art are avoided, the security is high, the demagnetization is completed efficiently and the normal operation of the transformer in the site is guaranteed.
Description
Technical field
The utility model belongs to electromagnetic current transducer degaussing gear field, specifically, relates to a kind of electromagnetic current transducer degaussing gear.
Background technology
Electromagnetic current transducer accidentally all can produce remanent magnetism under the state such as open circuit at large electric current is in service when cutting off the electricity supply or move secondary, and causes the magnetic permeability decline of iron core to affect the performance of instrument transformer.The remanent magnetism that exists of the electromagnetic current transducer in power system operation is a kind of general phenomenon, and the elimination of the remanent magnetism to on-the-spot electromagnetic current transducer in electric power system is at present all under power down mode, to utilize Flux saturation principle to carry out, and main method is:
1, open circuit demagnetization method.The method need to once all opening a way with secondary current transformer, and once or in the winding of secondary passing to power current, from zero progressively increase to rated current 50% evenly drop to slowly zero, and repeatedly, the electric current at every turn applying successively reduces.
2, closed circuit demagnetization method.In the secondary winding of current transformer, access the resistance of more than 10 times rated loads, and apply power current in current transformer first side winding, and be evenly reduced to slowly zero after being progressively increased to 120% rated current, need to repeatedly operate, need to progressively reduce accessed load resistance value at every turn.
Existing demagnetization method all need to and be untied completely under on-the-spot wiring condition under power down mode and carry out.Need the electric installation such as current lifting device, control device, the heavier and degaussing process wiring of whole set of installation and operation relative complex.Adopt open circuit demagnetization method, easily damage insulation and the compensating element, of the winding of electromagnetic transformer at the process generation high voltage of demagnetization.Adopt the method for closed circuit demagnetization possibly cannot realize the object of demagnetization completely.
The structure of electromagnetic current transducer, is mainly made up of iron core and winding, and it adopts magnetic induction principle the large current signal in primary circuit in electric power system to be transformed into the little current signal that can measure.Because its electromagnetic structure characteristics determined all may produce remanent magnetism in the process of operation, detection.Because the existence of remanent magnetism has just affected the permeability of transformer iron core, thereby affected the performance of instrument transformer, caused the error of instrument transformer to exceed standard, operating state changes, and cannot correctly measure and measure.
Utility model content
In order to overcome the deficiencies in the prior art, the utility model provides one to utilize frequency variation signal to inject secondary end, change the magnetic flux of CT, thereby the positive and negative alternately induction of magnetic flux is filled up and adjusted, to realize the electromagnetic current transducer degaussing gear of demagnetization object.
For addressing the above problem, the technical scheme that the utility model adopts is:
A kind of electromagnetic current transducer degaussing gear, is characterized in that: the access device that comprises detecting unit and be electrically connected with detecting unit, access device is electrically connected with load summation current transformer.
In described detecting unit, be provided with main control unit module, main control unit module is electrically connected with monitoring analysis processing module and frequency variation signal generator by Data Control bus, and main control unit module is electrically connected with keying module and display module; Described main control unit module, monitoring analysis processing module and frequency variation signal generator are electrically connected access device by data wire respectively.
Described access device comprises protection module and switch, between protection module and switch, connects by isolating transformer; The two ends of described protection module are electrically connected respectively monitoring analysis processing module and frequency variation signal generator; Described switch electrical connection main control unit module; Described switch electrical connection load summation current transformer.
Owing to having adopted technique scheme, compared with prior art, the utility model adopts coupling isolating transformer to access the low frequency signal that secondary loop of mutual inductor is realized on-line measurement and applied demagnetization, after magnetic core remanent magnetism situation by on-line monitoring leakage current instrument transformer, automatically apply the alien frequencies small-signal of demagnetization from the instrument transformer secondary side of electric current, be issued to the effect of demagnetization in the condition that does not affect the normal operation of instrument transformer.
The utility model is effectively saved the testing time, manpower and expense, realize without the online demagnetization technology having a power failure, greatly alleviate the hidden danger of complicated operation and existence, test signal is little, do not affect CT and normally work, the large test current, the high-power supply that do not exist background technology to occur, fail safe is good, efficiently complete demagnetization work, guarantee the normal operation of on-the-spot instrument transformer.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail simultaneously.
Brief description of the drawings
Fig. 1 is the theory diagram of a kind of embodiment of the utility model.
Embodiment
Embodiment:
As shown in Figure 1, a kind of electromagnetic current transducer degaussing gear, the access device that comprises detecting unit and be electrically connected with detecting unit, access device is electrically connected with load summation current transformer.
In the present embodiment, in described detecting unit, be provided with main control unit module, main control unit module is electrically connected with monitoring analysis processing module and frequency variation signal generator by Data Control bus, and main control unit module is electrically connected with keying module and display module.Described main control unit module, monitoring analysis processing module and frequency variation signal generator are electrically connected access device by data wire respectively.
Described access device comprises protection module and switch, between protection module and switch, connects by isolating transformer; The two ends of described protection module are electrically connected respectively monitoring analysis processing module and frequency variation signal generator; Described switch electrical connection main control unit module; Described switch electrical connection load summation current transformer.
When use, by the access device of a broadband test, can realize the undistorted transmission of signal of 900Hz～4kHz the isolation of realization and secondary loop of mutual inductor, simultaneously, detecting unit can be exported the wideband response of alternation frequency variation signal energy detecting current transformer secondary circuit, change detecting magnetic flux unusual condition from motion tracking frequency band, control the realization of output frequency conversion small-signal the magnetic flux of current transformer is repaired, reach demagnetizing action.
The utility model adopts coupling isolating transformer to access the low frequency signal that secondary loop of mutual inductor is realized on-line measurement and applied demagnetization, after magnetic core remanent magnetism situation by on-line monitoring leakage current instrument transformer, automatically apply the alien frequencies small-signal of demagnetization from the instrument transformer secondary side of electric current, be issued to the effect of demagnetization in the condition that does not affect the normal operation of instrument transformer.
The utility model is effectively saved the testing time, manpower and expense, realize without the online demagnetization technology having a power failure, greatly alleviate the hidden danger of complicated operation and existence, test signal is little, do not affect CT and normally work, the large test current, the high-power supply that do not exist background technology to occur, fail safe is good, efficiently complete demagnetization work, guarantee the normal operation of on-the-spot instrument transformer.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or akin technical scheme, all belong to protection range of the present utility model.
Claims (1)
1. an electromagnetic current transducer degaussing gear, is characterized in that: the access device that comprises detecting unit and be electrically connected with detecting unit, and access device is electrically connected with load summation current transformer; In described detecting unit, be provided with main control unit module, main control unit module is electrically connected with monitoring analysis processing module and frequency variation signal generator by Data Control bus, and main control unit module is electrically connected with keying module and display module; Described main control unit module, monitoring analysis processing module and frequency variation signal generator are electrically connected access device by data wire respectively; Described access device comprises protection module and switch, between protection module and switch, connects by isolating transformer; The two ends of described protection module are electrically connected respectively monitoring analysis processing module and frequency variation signal generator; Described switch electrical connection main control unit module; Described switch electrical connection load summation current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320696645.4U CN203659568U (en) | 2013-11-06 | 2013-11-06 | Electromagnetic current transformer demagnetization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320696645.4U CN203659568U (en) | 2013-11-06 | 2013-11-06 | Electromagnetic current transformer demagnetization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203659568U true CN203659568U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320696645.4U Expired - Lifetime CN203659568U (en) | 2013-11-06 | 2013-11-06 | Electromagnetic current transformer demagnetization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203659568U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT516564A1 (en) * | 2014-12-09 | 2016-06-15 | Omicron Electronics Gmbh | Degaussing device and method for demagnetizing a converter core |
| CN106873461A (en) * | 2017-03-02 | 2017-06-20 | 国家电网公司 | A kind of control method of remanence of current transformer degaussing gear |
-
2013
- 2013-11-06 CN CN201320696645.4U patent/CN203659568U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT516564A1 (en) * | 2014-12-09 | 2016-06-15 | Omicron Electronics Gmbh | Degaussing device and method for demagnetizing a converter core |
| US10804020B2 (en) | 2014-12-09 | 2020-10-13 | Omicron Electronics Gmbh | Demagnetization device and method for demagnetizing a transformer core |
| CN106873461A (en) * | 2017-03-02 | 2017-06-20 | 国家电网公司 | A kind of control method of remanence of current transformer degaussing gear |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |