CN104111438B - Primary large-current loop monitoring method in current transformer error test - Google Patents
Primary large-current loop monitoring method in current transformer error test Download PDFInfo
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Abstract
A primary large current loop monitoring method in a current transformer error test is characterized in that equipment used in a current transformer field error test is utilized and improved, an electric energy meter calibrator is adopted to monitor electrical parameters such as voltage, current, frequency and power angle of a primary large current loop to be tested so as to master electrical characteristics of the large current loop, and therefore loop impedance is monitored, data are accumulated so as to improve the field error test method and improve test level.
Description
Technical field
The invention belongs to power generation, power supply technique field, are specifically related to a kind of current transformer error testing experiment
In a big current loop monitoring method.
Background technology
The size of current great disparity in the circuit of generating, power transformation, transmission of electricity, distribution and electricity consumption, has to tens of thousands of Andu from several peaces, is
It is easy to measure, protect and control to need to be converted to the unified electric current of comparison, the voltage on circuit is typically all higher in addition, if
Direct measurement is breakneck, and current transformer just plays current transformation and electrical isolation effect.
Current transformer, current transformer, abbreviation CT, its effect can be numerical value larger once electricity
Stream is converted to the less secondary current of numerical value by certain no-load voltage ratio, for the purposes such as carrying out protecting, measuring.
Current mutual inductor on site error testing is the forcible inspection of item of National Technical regulatory requirements.Current transformer error is tested
Ultimate principle is that, using 0 ~ 220V power supplys U1 as input power, the voltage for reducing the input power using current lifting device makes magnitude of voltage
U is reduced to, big output current I is obtained, is made the current value of I about reach 1000-2000A, is formed primary circuit, will be tested electric current mutual
Sensor and standard current transformer are series in primary circuit, connect tested current transformer and mark respectively with error testing device
Quasi- current transformer, is measured to the error of tested current transformer.
The defect of above-mentioned error testing method is, if impedance loop is excessive or power factor is too low in test process
Will limit and once flow up ability and affect result of the test, cause primary current not reach required by detecting current transformer code
Current value, and cannot complete test.But current testing equipment cannot directly monitor primary circuit impedance in testing ground
Characteristic and electrical characteristic, thus also cannot reduce excessive impedance by corresponding measure Adjustment Tests method and improve and once flow up
Ability.
Therefore, can be while monitoring loop impedance, becomes and needs the target reached badly in transformer error test process.
The content of the invention
It is an object of the invention to provide a big current loop monitoring side in a kind of current transformer error testing experiment
Method, can monitor the impedance operator and electrical characteristic in primary circuit, so as to provide foundation to Adjustment Tests method.
Technical scheme provided by the present invention is：
A big current loop monitoring method in a kind of current transformer error testing experiment, which comprises the steps of：
Step one：Using 0 ~ 220V power supplys U1 as input power, the voltage for reducing the input power using current lifting device is obtained
Out-put supply, makes out-put supply output HIGH current value I, forms a big current loop, by tested electric current between I and out-put supply
Transformer and standard current transformer are series in a big current loop；
Step 2：The auxiliary secondary wiring that current lifting device secondary winds is connected to into powermeter verification instrumeter, it is once big for testing
The output voltage U of current loop out-put supply；The secondary output current signal of standard current transformer is accessed into the electric energy meter
Tester, for testing high current value I；
Step 3：U values, the current value I and the phase angle of the two obtained by powermeter verification instrumeterΦ, calculate
Loop resistance R=, reactance X=；
Step 4：The secondary outfan of the secondary outfan and standard current transformer of tested current transformer respectively with by mistake
Difference test device is connected, and the method proofreaded using standard current transformer is measured to the error of tested current transformer.
Further, a big current loop monitoring method in current transformer error testing experiment of the present invention,
Wherein：In step one, the current value of I is 1000-2000A.
Further, a big current loop monitoring method in current transformer error testing experiment of the present invention,
Wherein：Error testing device in step 5 is mutual-inductor tester.
Preferably, a big current loop monitoring method in current transformer error testing experiment of the present invention, its
In：The mutual-inductor tester is the HEH-1 type mutual-inductor testers of Wuhan Guo Ce electric corporation production.
Preferably, a big current loop monitoring method in current transformer error testing experiment of the present invention, its
In：In step 2, the powermeter verification instrumeter is the CL3121 type electric energy meters school of Shenzhen Ke Lu Electronic Science and Technology Co., Ltd.s production
Test instrument.
Preferably, a big current loop monitoring method in current transformer error testing experiment of the present invention, its
In：In step one, the current lifting device is the SL-1 type current lifting devices of Wuhan Guo Ce electric corporation production.
The present invention technique effect be：
1st, present invention innovation is improved in existing technical conditions, using powermeter verification instrumeter real time monitoring electricity
The impedance operator and electrical characteristic of current transformer error testing primary circuit, is adjusted flexibly test method in order to scene, searches
Affect to rise the factor of flow horizontal and test effect present in test, improve field test ability, collect enough by monitoring
Data, be available for analyzing tested current transformer error test impact of the middle impedance factor to measurement error, further exclude outer
Boundary's factor, improves up-flow ability, has ensured that current mutual inductor on site error test is reliably effectively carried out.
2nd, current lifting device due to output current value it is larger, according to direct terminal connect, it is impossible to bear excessive electric current.Output
By the way of punching, it is impossible to directly test output voltage, therefore the present inventor by changing to current lifting device structure
Make and solve the technical problem so that the measure of big current loop impedance is possibly realized.
3rd, powermeter verification instrumeter is capable of the function of accurate measurement voltage, electric current, frequency, generator rotor angle and waveform, and measuring accuracy reaches
To 0.05%, the present inventor is by contrasting various instrument and equipments, final to determine powermeter verification instrumeter as the prison of the present invention
Device is surveyed, is worked well.
Description of the drawings
A big current loop supervisory circuit and equipment connection in a kind of current transformer error testing experiment of Fig. 1 present invention
Figure；
Wherein, 1 input power, 2 out-put supplies, 3 current lifting devices, 4 big current loops, 5 standard current transformers, 6 quilts
Survey current transformer, 7 error testing devices, 8 powermeter verification instrumeters.
Specific embodiment
Below in conjunction with specific embodiment, the present invention will be described, and following examples are only used for illustrating the present invention, no
As the restriction of the scope of the present invention.
Embodiment 1 certain new power plant construction energy metering current transformer error test data
Testing time：On April 18th, 2011；Current transformer ratio：300A/1A, Xi'an Electric Power Machinery Plant, model：
LB6-220W2, accuracy rating：0.2S levels, in December, 2008；CT setting height(from bottom)s：8 meters（Body containing transformer）, primary current time
Road length：20 meters.
Operation is as follows, as shown in Figure 1：
Step one：Using 0 ~ 220V power supplys U1 as input power 1, the voltage for reducing the input power 1 using current lifting device 3 is obtained
Out-put supply 2 is obtained, out-put supply output HIGH current value I is made, a big current loop 4 between I and out-put supply, is formed, will be tested
Current transformer 6 and standard current transformer 5 are series in a big current loop 4, using two current lifting devices 3 during test, one
Primary current punching 4 is pricked, and primary circuit voltage sample p-wire punching current lifting device 34 is pricked totally, output voltage and the output of actual primary line
Voltage is identical；
Step 2：The auxiliary secondary wiring that 3 secondary of current lifting device winds is connected to into powermeter verification instrumeter 8, for test once
The output voltage U of big current loop out-put supply；The secondary output current signal of standard current transformer 5 is accessed into the electric energy
Table tester 8, for testing high current value I, U and I measured values are shown in Table 1；
Step 3：U values, the current value I and the phase angle of the two obtained by powermeter verification instrumeter 8Φ, calculate
Go out loop resistance R=, reactance X=；
Test data is as shown in table 1：
Table 1：Standby change primary circuit load testing parameter opens in Lu Hua power plant
Step 4：The secondary outfan of the secondary outfan and standard current transformer 5 of tested current transformer 6 respectively with
Error testing device 7 is connected, and the method proofreaded using standard current transformer 5 is surveyed to the error of tested current transformer 6
It is fixed.
Embodiment 2 certain newly-built 220kV transformer stations energy metering current transformer error test data
May 20, transformer test is carried out to certain newly-built 220kV transformer station, current transformer is tested in 110kV sides
When, circuit power factor is detected.
Testing time：On May 20th, 2011；Test object：110kV main transformer inlet wire current transformers；Transformer nameplate：
1600A/1A, 0.2S level, JSDX3-126, Shanghai Wusong Electricity Industry Co., Ltd.
Operate and be, as shown in Figure 1：
Step one：Using 0 ~ 220V power supplys U1 as input power 1, a current lifting device 3, current lifting device 3 totally 4 during test, are adopted
Prick, p-wire 4 is pricked, the voltage for the input power 1 being reduced using current lifting device 3 obtains out-put supply 2, make the high electricity of out-put supply output
Flow valuve I, forms a big current loop 4, tested current transformer 6 and standard current transformer 5 is gone here and there between I and out-put supply
It is coupled in a big current loop 4；
Step 2：The auxiliary secondary wiring that 3 secondary of current lifting device winds is connected to into powermeter verification instrumeter 8, for test once
The output voltage U of big current loop out-put supply；The secondary output current signal of standard current transformer 5 is accessed into the electric energy
Table tester 8, for testing high current value I, U and I values are shown in Table 2；
Step 3：U values, the current value I and the phase angle of the two obtained by powermeter verification instrumeter 8Φ, calculate
Go out loop resistance R=, reactance X=；
Test data is as shown in table 2：
2 Fuping 220kV transformer stations 110kV main transformer inlet wire current transformers primary circuit load testing data of table
Step 4：The secondary outfan of the secondary outfan and standard current transformer 5 of tested current transformer 6 respectively with
Error testing device 7 is connected, and the method proofreaded using standard current transformer 5 is surveyed to the error of tested current transformer 6
It is fixed.
Understand, using this method, can be capable of achieving in big current loop while determining to current transformer error
Impedance be monitored, to ensure good up-flow ability, the excessive deviation for causing of control big current loop impedance.
Claims (6)
1. a big current loop monitoring method in a kind of current transformer error testing experiment, it is characterised in that comprising following step
Suddenly：
Step one：Using 0 ~ 220V power supply U1 as input power（1）, using current lifting device（3）Reduce the input power（1）Voltage
Obtain out-put supply（2）, out-put supply output HIGH current value I is made, a big current loop between I and out-put supply, is formed（4）,
By tested current transformer（6）And standard current transformer（5）It is series at a big current loop（4）In；
Step 2：By current lifting device（3）The auxiliary secondary wiring of secondary winding is connected to powermeter verification instrumeter（8）, for test once
The output voltage U of big current loop out-put supply；By standard current transformer（5）Secondary output current signal access the electricity
Can table tester（8）, for testing high current value I；
Step 3：By powermeter verification instrumeter（8）The U values of acquisition, the current value I and the phase angle of the twoΦ, calculate
Loop resistance R=, reactance X=；
Step 4：Tested current transformer（6）Secondary outfan and standard current transformer（5）Secondary outfan respectively with
Error testing device（7）It is connected, using standard current transformer（5）The method of check and correction is to tested current transformer（6）Error
It is measured.
2. a big current loop monitoring method in current transformer error testing experiment as claimed in claim 1, its feature
It is：In step one, the current value of I is 1000-2000A.
3. a big current loop monitoring method in current transformer error testing experiment as claimed in claim 1, its feature
It is：Error testing device in step 5（7）For mutual-inductor tester.
4. a big current loop monitoring method in current transformer error testing experiment as claimed in claim 3, its feature
It is：The mutual-inductor tester is the HEH-1 type mutual-inductor testers of Wuhan Guo Ce electric corporation production.
5. a big current loop monitoring method in current transformer error testing experiment as claimed in claim 1, its feature
It is：In step 2, the powermeter verification instrumeter（8）For the CL3121 type electric energy of Shenzhen Ke Lu Electronic Science and Technology Co., Ltd.s production
Table tester.
6. a big current loop monitoring method in current transformer error testing experiment as claimed in claim 1, its feature
It is：In step one, the current lifting device（3）For the SL-1 type current lifting devices of Wuhan Guo Ce electric corporation production.
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| CN105717363A (en) * | 2016-04-06 | 2016-06-29 | 威胜集团有限公司 | Current loop impedance testing device of smart meter and impedance calculation method |
| CN108038078B (en) * | 2017-12-11 | 2021-03-16 | 囯网河北省电力有限公司电力科学研究院 | Parameter calculation method and device in current transformer detection and terminal equipment |
| CN110391554A (en) * | 2018-04-23 | 2019-10-29 | 金一凡 | A kind of intelligent socket that can monitor contact impedance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644751A (en) * | 2009-08-11 | 2010-02-10 | 陕西电力科学研究院 | Method for raising distributed type large current of GIS bushing type current transformer |
| CN201569735U (en) * | 2009-12-25 | 2010-09-01 | 哈尔滨电工仪表研究所 | Vehicle on-site automatic calibration device of power transformer |
| CN102096060A (en) * | 2010-11-30 | 2011-06-15 | 国网电力科学研究院 | Circuit for checking on-site accuracy of current transformer under condition of underload operations |
| CN202886584U (en) * | 2012-09-14 | 2013-04-17 | 珠海威瀚科技发展有限公司 | Novel integrated error checking device of high-voltage energy measurement device |
| WO2013063856A1 (en) * | 2011-11-03 | 2013-05-10 | 四川电力科学研究院 | Method for testing error influence amount on high voltage three-phase current transformer by high voltage leakage current |
| CN202948126U (en) * | 2012-12-05 | 2013-05-22 | 河北省电力公司电力科学研究院 | Current transformer site error test system |
-
2014
- 2014-07-18 CN CN201410341230.4A patent/CN104111438B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644751A (en) * | 2009-08-11 | 2010-02-10 | 陕西电力科学研究院 | Method for raising distributed type large current of GIS bushing type current transformer |
| CN201569735U (en) * | 2009-12-25 | 2010-09-01 | 哈尔滨电工仪表研究所 | Vehicle on-site automatic calibration device of power transformer |
| CN102096060A (en) * | 2010-11-30 | 2011-06-15 | 国网电力科学研究院 | Circuit for checking on-site accuracy of current transformer under condition of underload operations |
| WO2013063856A1 (en) * | 2011-11-03 | 2013-05-10 | 四川电力科学研究院 | Method for testing error influence amount on high voltage three-phase current transformer by high voltage leakage current |
| CN202886584U (en) * | 2012-09-14 | 2013-04-17 | 珠海威瀚科技发展有限公司 | Novel integrated error checking device of high-voltage energy measurement device |
| CN202948126U (en) * | 2012-12-05 | 2013-05-22 | 河北省电力公司电力科学研究院 | Current transformer site error test system |
Non-Patent Citations (1)
| Title |
|---|
| 电流互感器误差测试大电流回路特性及改善方法研究;孙冲等;《电测与仪表》;20120930;第49卷(第561期);第58-62页 * |
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Address after: 050091 Hebei high tech District of Shijiazhuang City Xinshi North Road, No. 368 Patentee after: National network Hebei Energy Technology Service Co., Ltd. Address before: 050091 Hebei high tech District of Shijiazhuang City Xinshi North Road, No. 368 Patentee before: Hebei Electric Power Construction & Adjustment Research Institute |
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Effective date of registration: 20220517 Address after: 050000 No. 200 Xing'an Street, high tech Zone, Shijiazhuang, Hebei Patentee after: STATE GRID HEBEI ENERGY TECHNOLOGY SERVICE Co.,Ltd. Patentee after: State Grid Hebei Electric Power Co., Ltd. Marketing Service Center Address before: 050091 No.368, Xinshi North Road, high tech Zone, Shijiazhuang City, Hebei Province Patentee before: STATE GRID HEBEI ENERGY TECHNOLOGY SERVICE Co.,Ltd. |