CN101556317A - Anti-interference device for on-site calibration device of current transformer - Google Patents
Anti-interference device for on-site calibration device of current transformer Download PDFInfo
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- CN101556317A CN101556317A CNA2009100279682A CN200910027968A CN101556317A CN 101556317 A CN101556317 A CN 101556317A CN A2009100279682 A CNA2009100279682 A CN A2009100279682A CN 200910027968 A CN200910027968 A CN 200910027968A CN 101556317 A CN101556317 A CN 101556317A
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- current
- transformer
- current transformer
- mutual inductor
- site calibration
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Abstract
The invention discloses the anti-interference device for the on-site calibration device of a current transformer and comprises the on-site calibration device of the current transformer, which is connected with the transformer to be calibrated, wherein, the on-site calibration device comprises a transformer calibrator; the invention is characterized in that a shield is arranged outside the on-site calibration device of the current transformer; the primary and secondary connecting wires of the transformer to be calibrated are the shielded twisted pair with one terminal of the shielding layer being grounded; and a shield is arranged outside the transformer calibrator HEW and grounded. The invention prevents the entire calibrator from being affected by the external intensive electromagnetic field, thereby solving the interference-related problems caused by the electromagnetic field, avoiding the abnormal phenomena that the display goes wrong, the current ratio of the current transformer to be calibrated cannot be accurately tested, the error data fluctuate or vary greatly, etc, and guaranteeing the normal operation of calibration.
Description
Technical field
The present invention relates to a kind of current transformer, especially relate to a kind of means for anti-jamming of current mutual inductor field detecting device, belong 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.
Summary of the invention
Technical matters to be solved by this invention 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 invention 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 present invention 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 invention.
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 present invention with preferred embodiment, so it is not in order to restriction the present invention, and all technical schemes that scheme obtained of taking to be equal to replacement or equivalent transformation all drop in protection scope of the present invention.
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 |
|---|---|---|---|
| CNA2009100279682A CN101556317A (en) | 2009-05-14 | 2009-05-14 | Anti-interference device for on-site calibration device of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100279682A CN101556317A (en) | 2009-05-14 | 2009-05-14 | Anti-interference device for on-site calibration device of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101556317A true CN101556317A (en) | 2009-10-14 |
Family
ID=41174507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100279682A Pending CN101556317A (en) | 2009-05-14 | 2009-05-14 | Anti-interference device for on-site calibration device of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101556317A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104297712A (en) * | 2014-10-31 | 2015-01-21 | 国家电网公司 | Gage and source integrated device for anti-interference digital high-voltage gage calibration |
| CN105044649A (en) * | 2015-08-28 | 2015-11-11 | 重庆拉姆达信息技术有限公司 | Current transformer error horizontal dynamic detection method and system |
-
2009
- 2009-05-14 CN CNA2009100279682A patent/CN101556317A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104297712A (en) * | 2014-10-31 | 2015-01-21 | 国家电网公司 | Gage and source integrated device for anti-interference digital high-voltage gage calibration |
| CN104297712B (en) * | 2014-10-31 | 2017-10-24 | 国家电网公司 | A kind of anti-interference digital high voltage table calibration resource integrated device of table |
| CN105044649A (en) * | 2015-08-28 | 2015-11-11 | 重庆拉姆达信息技术有限公司 | Current transformer error horizontal dynamic detection method and system |
| CN105044649B (en) * | 2015-08-28 | 2018-04-20 | 重庆拉姆达信息技术有限公司 | A kind of current transformer error horizontal dynamic detection method and system |
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Open date: 20091014 |