CN201421497Y - Anti-interference device of field calibrating device of current transformer - Google Patents
Anti-interference device of field calibrating device of current transformer Download PDFInfo
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- CN201421497Y CN201421497Y CN200920045857XU CN200920045857U CN201421497Y CN 201421497 Y CN201421497 Y CN 201421497Y CN 200920045857X U CN200920045857X U CN 200920045857XU CN 200920045857 U CN200920045857 U CN 200920045857U CN 201421497 Y CN201421497 Y CN 201421497Y
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- current transformer
- transformer
- mutual inductor
- calibrating device
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- 238000012360 testing method Methods 0.000 abstract description 13
- 230000005672 electromagnetic field Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
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Abstract
The utility model discloses an anti-interference device of a field calibrating device of a current transformer. The anti-interference device comprises the field calibrating device of the current transformer, wherein the field calibrating device is connected with a calibrated transformer; and the field calibrating device comprises a transformer calibrator. The anti-interference device is characterized in that the outer side of the field calibrating device of the current transformer is shielded. The primary and the secondary connecting leads of the calibrated transformer are the shielding twin-twisted leads, and one end of a shielding layer is grounded. The transformer calibrator HEW is shielded and grounded. The utility model avoids the influence of external electromagnetic field on the whole instrument, thereby solving the interference caused by the electromagnetic field, avoiding the abnormal occurrences that the field calibrating device of the current transformer can not display abnormally, the testing for the current ratio of the calibrated current transformer is inaccurate, the fluctuation or change of error data is bigger, and the like, so as to ensure the detection work to benormal.
Description
Technical field
The utility model relates to a kind of current transformer, especially relates to a kind of means for anti-jamming of current mutual inductor field detecting device, belongs to technical field of power systems.
Background technology
Along with the fast development of China's power industry, the construction of generating plant, various places and transformer station also is in the climax of a construction thereupon in recent years, and 500KV transformer station becomes the main flow of power grid construction day by day in the construction of transformer station.The current transformer that is applied to 500KV transformer station is more and more, the critical point gage work is more and more heavier, this just has higher requirement to the on-the-spot testing of current transformer: accurate, safety, quick, the on-the-spot current transformer that detects generally has two kinds of methods: 1. classic method is that " relative method " 2. detects i.e. " low pressure extrapolation method " with HLE1-A.
One, with the on-the-spot drawback that detects the current transformer existence of traditional detection method (being relative method)
Traditional calibration method all is to use mutual-inductor tester, when the calibrating current transformer, tested Current Transformer Secondary is connected to load, compare with standard current transformer with current ratio, provide primary current by current lifting device to the two, and the second difference of the two stream input validation instrument is measured the error of tested current transformer with respect to standard current transformer by tester.This calibration method needs the large-current electric source device, with current ratio standard current transformer and current capacity case, when primary current during greater than 1000A, the power-supply device capacity is up to ten kilovolt-amperes, and is bulky, and big electric current wiring difficulty, it is very inconvenient to examine and determine current transformer at the scene.
If at current transformer that current ratio is 4000/1A of 500KV transformer station calibrating, connect the primary circuit and will use the big current lead of 4000A, because overhead about 15 meters of bus of current transformer, then to connect the primary circuit and then need 30 meters of the big current lead of 4000A, kilograms up to a hundred weigh, and connect difficulty with bus, even and connects, it is also very difficult to make primary current be raised to ratings.Another method be exactly with crane with power supply, pressure regulator, standard rise to as far as possible the primary side near tested current transformer, this needs great amount of manpower, material resources are tested very inconvenient.So in the test, because condition restriction, the accuracy of test is difficult to guarantee at the scene.
Two, Current Transformer device for on-site calibration, the advantage when examining and determine the electric current mutual inductance and the part deficiency of existence in the 500KV transformer station that part has a power failure.
Do not need power supply, standard great current mutual inductor, current capacity case and the big current lead of big electric current when the Current Transformer device for on-site calibration is tested at the scene, and current transformer is examined and determine by the voltage transformer (VT) of same error.Employing is surveyed sum of errors admittance etc. at secondary side related parameter, and by the new principle of microcomputer computing, reaches the same with former mutual-inductor tester, can directly show tested current transformer error.Thereby make the calibrating of on-the-spot current transformer, not only do not need big electric current to connect, as long as and be with a HLE1-A type calibrating installation (its power supply capacity is no more than 10VA) just can realize, it is convenient especially to examine and determine.
Wiring is very simple during the Current Transformer test.Primary line and secondary line are line and directly are the soft copper lead of Siping City's square millimeter, as long as clip to the primary side and the secondary side of tested mutual inductor with clip, and output capacity has only 10VA, can measure the error of 1～120%In each point, really realizes precisely, safety, quick.
Current Transformer has been brought convenience to calibration operation really when test, the weight of device has only 15Kg, has saved great amount of manpower and material resources.But in a large amount of testing processes, we find the 500KV transformer station in the part power failure, device occurs LCD sometimes and can not normally show, or tested sometimes current transformer current ratio test is inaccurate, abnormalities such as error information fluctuation or variation are bigger, cause testing normally not carry out, the testing of mutual inductor is affected.
The utility model content
Technical problem to be solved in the utility model provides a kind of means for anti-jamming of current mutual inductor field detecting device, can solve that current transformer calibrating device is interfered and the problem that test is inaccurate, error is big that causes.
For solving the problems of the technologies described above, the utility model provides a kind of means for anti-jamming of current mutual inductor field detecting device, comprise the current mutual inductor field detecting device that is connected with tested mutual inductor, described device for on-site calibration comprises mutual-inductor tester, it is characterized in that: the outer setting at described current mutual inductor field detecting device has shielding.
The lead that once is connected with secondary of described tested mutual inductor is a Shielded Twisted Pair, screen layer one end ground connection.
Described mutual-inductor tester HEW is outside equipped with shielding and ground connection.
The utility model compared with prior art has following beneficial effect: 1, adopt Shielded Twisted Pair, avoided the influence of extraneous strong-electromagnetic field to connecting conducting wire; 2, influencing each other of instrument internal electromagnetic field avoided in mutual-inductor tester shielding; 3, current mutual inductor field detecting device shielding, avoided of the influence of extraneous strong-electromagnetic field to whole instrument, thereby solved because the interference of electromagnetic field, avoided that current mutual inductor field detecting device can occur that display can not normally show, the test of tested current transformer current ratio is inaccurate, error information fluctuation or change abnormalities such as bigger, guarantee normally carrying out of testing.
Description of drawings
Fig. 1 is the wiring diagram of a kind of embodiment of means for anti-jamming of current mutual inductor field detecting device of the present utility model.
Embodiment
A kind of means for anti-jamming of current mutual inductor field detecting device, it comprises pressure regulator T, 0.5 grade of band booster voltage mutual inductor PT, 0.02 grade standard mutual inductor CT
0, mutual-inductor tester HEW, sampling resistor R, tested current transformer ramp K
1, K
2, K
1C, K
2C, L
1, L
2With the ground connection terminal, the input termination of pressure regulator T input power supply, power frequency 220V, the input end of output termination 0.5 band booster voltage mutual inductor PT; 0.5 the Secondary Winding polarity termination K of level band booster voltage mutual inductor PT
1CTerminal, nonpolar termination earth terminal button, three winding voltage U are miniature sampled voltage, its voltage ratio K
a=U
2/ U directly connects the sampled voltage terminal of mutual-inductor tester HEW; 0.02 grade standard mutual inductor CT
0Voltage ratio be current ratio K=I
1/ 5, I
1The nonpolar termination K of=25～5000, winding
2Button, the polar end tap connects the conversion K switch
B, K
BPublic termination K
1Terminal, the nonpolar termination L of Secondary Winding
1Terminal, the polar end tap connects the conversion K switch
L, K
LPublic relay termination J, relay can be connected the polar end or the K of the differential pressure of mutual-inductor tester HEW respectively
2CTerminal; The two ends of sampling resistor R meet K respectively
2CTerminal and ground connection terminal; The nonpolar termination L of mutual-inductor tester HEW differential pressure
2Terminal connects the ground connection terminal simultaneously, and current mutual inductor field detecting device is provided with shielding.The lead that once is connected with secondary of described tested mutual inductor is a Shielded Twisted Pair, screen layer one end ground connection.Described mutual-inductor tester HEW is outside equipped with shielding and ground connection.
Below announced the utility model with preferred embodiment, so it is not in order to restriction the utility model, and all technical schemes that scheme obtained of taking to be equal to replacement or equivalent transformation all drop in the protection domain of the present utility model.
Claims (3)
1. the means for anti-jamming of a current mutual inductor field detecting device, comprise the current mutual inductor field detecting device that is connected with tested mutual inductor, described device for on-site calibration comprises mutual-inductor tester, it is characterized in that: the outer setting at described current mutual inductor field detecting device has shielding.
2. the means for anti-jamming of current mutual inductor field detecting device according to claim 1, it is characterized in that: the lead that once is connected with secondary of described tested mutual inductor is a Shielded Twisted Pair, screen layer one end ground connection.
3. the means for anti-jamming of current mutual inductor field detecting device according to claim 1 and 2 is characterized in that: described mutual-inductor tester is outside equipped with shielding and ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920045857XU CN201421497Y (en) | 2009-05-14 | 2009-05-14 | Anti-interference device of field calibrating device of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920045857XU CN201421497Y (en) | 2009-05-14 | 2009-05-14 | Anti-interference device of field calibrating device of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201421497Y true CN201421497Y (en) | 2010-03-10 |
Family
ID=41808157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920045857XU Expired - Lifetime CN201421497Y (en) | 2009-05-14 | 2009-05-14 | Anti-interference device of field calibrating device of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201421497Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819264A (en) * | 2010-05-10 | 2010-09-01 | 山西省机电设计研究院 | Portable type current transformer calibrating device |
| CN103123390A (en) * | 2012-12-13 | 2013-05-29 | 天津市静海供电有限公司 | Mutual inductor field calibration wire-connection method |
-
2009
- 2009-05-14 CN CN200920045857XU patent/CN201421497Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819264A (en) * | 2010-05-10 | 2010-09-01 | 山西省机电设计研究院 | Portable type current transformer calibrating device |
| CN103123390A (en) * | 2012-12-13 | 2013-05-29 | 天津市静海供电有限公司 | Mutual inductor field calibration wire-connection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20121025 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121025 Address after: 210029 No. 243 Fenghuang West Street, Jiangsu, Nanjing Patentee after: Jiangou Provincial Power Test Inst Co., Ltd. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 210029 No. 243 Fenghuang West Street, Jiangsu, Nanjing Patentee before: Jiangou Provincial Power Test Inst Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100310 |
|
| CX01 | Expiry of patent term |