CN1172261A - Method and device for checking electric power mutual inductor - Google Patents
Method and device for checking electric power mutual inductor Download PDFInfo
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- CN1172261A CN1172261A CN 97109217 CN97109217A CN1172261A CN 1172261 A CN1172261 A CN 1172261A CN 97109217 CN97109217 CN 97109217 CN 97109217 A CN97109217 A CN 97109217A CN 1172261 A CN1172261 A CN 1172261A
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- mutual inductor
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Abstract
The present invention relates to a method for checking power mutual-inductor and its checking device. It is characterized by directly measuring electric current and voltage values of primary side and secondary side of said mutual-inductor, and using the measured results to calculate the ratio error and angular error. Said invention is easy to implement, and has no need of such auxiliary devices of standard mutual-inductor, voltage regulator, booster, current booster and heavy current conductor, only uses the invented device which can independently measure the error of the mutual-inductor, it can save test time and is easy to carry about, and its measurement accuracy is high.
Description
The present invention relates to a kind of electric power mutual-inductor method of calibration and adopt the transducer check device of this method.
Existing transformer error method of calibration is that tested mutual inductor is compared with the standard mutual inductor of known error, measures the relative mutual inductance between the two, thereby obtains the actual error of tested mutual inductor.Adopt this method to need the big weight of volume big current lifting device, stepup transformer, standard mutual inductor, pressure regulator, tester and big current lead etc., when actual field is measured, need expend lot of manpower and material resources, so field-checking is very difficult.Patent CN2132219Y discloses a kind of electronic transducer calibration instrument, adopts a kind of transformer simple in structure to replace pressure regulation multiplying power transformer; Adopt electronic circuit and multidigit electricity guide box to replace the multidigit capacitive in tester, volume, weight and the cost of device therefor all reduce to some extent when making actual measurement, but do not break away from the method for using standard mutual inductor to do contrast yet, and therefore original problem is still unresolved.
The purpose of this invention is to provide a kind of new electric power mutual-inductor method of calibration and device, use this method of calibration and device can use standard mutual inductor, pressure regulator and relevant device, expend the problem of a large amount of manpowers and time thereby the use equipment in the on-the-spot transducer check of having solved is too heavy.
The solution of the present invention is:
1, by the secondary side incoming transport experiment power supply of school current transformer, the primary side open circuit; Or by the high-pressure side incoming transport experiment power supply of school voltage transformer (VT), the secondary side open circuit;
2, measure the current/voltage value of the electric current, magnitude of voltage and the opposite side that add the experiment power supply side, calculate mutual inductor ratio and angular difference value by calculating.
In the above-mentioned method of calibration, described ac test power supply is the alien frequencies working method, and promptly the ac test supply frequency slightly is partial to the actual motion frequency of mutual inductor, and measured value under the alien frequencies is adapted to corresponding numerical value under the normal frequency.
The current transformer calibration equipment of using said method is: comprise that access is by school Current Transformer Secondary side and voltage sensor and the experiment power supply in parallel with secondary load; access is by the high input impedance voltage sensor of school mutual inductor primary side; access is by the current sensor in school mutual inductor secondary impedance and experiment power supply loop; insert the current sensor in secondary load and experiment power supply loop, the output terminal of above-mentioned four sensors connects the input end of microprocessor through the amplification filtering unit.
The voltage transformer (VT) calibration equipment of using said method is: comprise that access is by school voltage transformer secondary side and the voltage sensor in parallel with secondary load; access is by the high input impedance voltage sensor and the experiment power supply of school mutual inductor primary side; access is by the current sensor in mutual inductor secondary impedance loop, school; insert the current sensor in secondary load loop, the output terminal of above-mentioned four sensors connects the input end of microprocessor through the amplification filtering unit.
The present invention directly measures electric current and magnitude of voltage at mutual inductor primary side and secondary side, and utilizes its measurement result to calculate the ratio and the angular difference of mutual inductor.The present invention is convenient to implement, do not need utility appliance such as standard mutual inductor, pressure regulator, stepup transformer, current lifting device, big current lead, only get final product the error of independent measurement mutual inductor with apparatus of the present invention, save test period, reduce personnel labor intensity, solved the difficult difficulty of implementing of transformer error test.Adopt the alien frequencies experiment power supply simultaneously, signal and interference can be separated, thereby good interference free performance is arranged.Apparatus of the present invention are light and handy, and are easy to carry and use, and the measuring accuracy height.
Accompanying drawing is the structural representation of current transformer calibration equipment.
Z among the figure
10, Z
20, Zm and Z
RConstituted the theoretical model of mutual inductor jointly, Z
10Be leakage impedance of mutual inductor, Z
20Be mutual inductor secondary leakage impedance, Zm is the excitatory impedance of mutual inductor, Z
RBe the mutual inductor secondary load.Incoming transport alien frequencies experiment power supply S and voltage sensor PT on by school mutual inductor secondary port
2, PT
2Be to be used for measuring secondary leakage impedance Z
20With the voltage V on the excitatory impedance Z m
2, this voltage also is secondary load Z
ROn voltage; By school mutual inductor primary side open circuit, and at a side joint high input impedance of mutual inductor voltage sensor PT
1, be used for measuring the voltage V on the excitatory impedance Z m
1, when carrying out the measurement of excitatory impedance Z m, should improve voltage sensor PT as far as possible
1Input impedance, in order to avoid a leakage impedance Z
10On the measurement accuracy of the excitatory impedance Z m of pressure drop affects, by school mutual inductor secondary leakage impedance Z
20With meet current sensor CT in the experiment power supply S loop
1, be used for measuring secondary leakage impedance Z
20With the electric current I on the excitatory impedance Z m
2At secondary load Z
RMeet current sensor CT with experiment power supply S loop
2, be used for measuring secondary load Z
ROn electric current I
R, the output terminal of above-mentioned four sensors connects the input end of microprocessor 2 through amplification filtering unit 1.Be connected to keyboard 3, printer 4 and display 5 on the microprocessor 2, so that practical operation.
When the mutual inductor on site verification, at first calibration equipment is started shooting, resetted, regulate the output voltage that exchanges alien frequencies experiment power supply S, carry out data acquisition by microprocessor 2, measure and flow through secondary load Z
RCurrent value, if this current value is not the test point value of stipulating in the mutual inductor inspection procedure, continue to regulate exchange the output voltage of alien frequencies experiment power supply S; When if this current value is the test point value of stipulating in the mutual inductor inspection procedure, then no longer regulate experiment power supply S, press the feeler switch on the lower keyboard 3 then, read two current sensor CT by microprocessor 2
1, CT
2With two voltage sensor PT
1, PT
2On four data, promptly read secondary leakage impedance Z
20With the electric current I on the excitatory impedance Z m
2Secondary load Z
ROn electric current I
RVoltage V on the excitatory impedance Z m
1Secondary leakage impedance Z
20With the voltage V on the excitatory impedance Z m
2Plural calculation procedure is set in microprocessor 2, calculates following various:
And by formula
Calculate by the ratio difference f of school mutual inductor and angular difference δ.
The verification of the method for calibration of voltage transformer (VT) and principle and current transformer is basic identical.When difference is the voltage transformer (VT) verification, add experiment power supply, take out induced signal at secondary side and measure and calculate at primary side.
Claims (4)
1, a kind of electric power mutual-inductor method of calibration is characterized in that comprising the following steps:
A, by the secondary side incoming transport experiment power supply of school current transformer, the primary side open circuit; Or by the high-pressure side incoming transport experiment power supply of school voltage transformer (VT), the secondary side open circuit;
B, measurement add the current/voltage value of electric current, magnitude of voltage and the opposite side of experiment power supply side, calculate mutual inductor ratio and angular difference value by calculating.
2, by the described method of calibration of claim 1, it is characterized in that the ac test power supply is the alien frequencies working method, promptly the ac test supply frequency slightly is partial to the actual motion frequency of mutual inductor, and measured value under the alien frequencies is adapted to corresponding numerical value under the normal frequency.
3, a kind of current transformer calibration equipment of using said method; it is characterized in that comprising that access is by school Current Transformer Secondary side and voltage sensor and the experiment power supply in parallel with secondary load; access is by the high input impedance voltage sensor of school mutual inductor primary side; access is by the current sensor in school mutual inductor secondary impedance and experiment power supply loop; insert the current sensor in secondary load and experiment power supply loop, the output terminal of above-mentioned four sensors connects the input end of microprocessor through the amplification filtering unit.
4, a kind of voltage transformer (VT) calibration equipment of using said method; it is characterized in that comprising that access is by school voltage transformer secondary side and the voltage sensor in parallel with secondary load; access is by the high input impedance voltage sensor and the experiment power supply of school mutual inductor primary side; access is by the current sensor in mutual inductor secondary impedance loop, school; insert the current sensor in secondary load loop, the output terminal of above-mentioned four sensors connects the input end of microprocessor through the amplification filtering unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109217 CN1057160C (en) | 1997-08-27 | 1997-08-27 | Method and device for checking electric power mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97109217 CN1057160C (en) | 1997-08-27 | 1997-08-27 | Method and device for checking electric power mutual inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1172261A true CN1172261A (en) | 1998-02-04 |
| CN1057160C CN1057160C (en) | 2000-10-04 |
Family
ID=5171027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97109217 Expired - Fee Related CN1057160C (en) | 1997-08-27 | 1997-08-27 | Method and device for checking electric power mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1057160C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6479691B1 (en) | 1998-04-23 | 2002-11-12 | Mitsubishi Rayon Co., Ltd. | Catalyst for producing unsaturated nitrile |
| CN102043139A (en) * | 2010-12-16 | 2011-05-04 | 中国人民解放军空军工程大学 | Calibration device of current transformer and method for calibrating current transformer by using same |
| CN101556320B (en) * | 2009-04-30 | 2011-10-26 | 厦门红相电力设备股份有限公司 | On-site calibrating method and device of capacitor voltage transformer |
| CN102445622A (en) * | 2011-12-12 | 2012-05-09 | 河南省电力公司洛阳供电公司 | Portable tester for volt-ampere characteristic of current transformer |
| CN102087347B (en) * | 2009-12-08 | 2013-05-29 | 张建 | Charged test method for current transformer and application thereof |
| CN103439682A (en) * | 2013-09-16 | 2013-12-11 | 国家电网公司 | Portable current transformer composite error testing device and method for testing composite error of current transformer by utilizing portable current transformer composite error testing device |
| CN104062621A (en) * | 2014-06-12 | 2014-09-24 | 山东省计量科学研究院 | Isolation voltage mutual inductor error checking method and checking system |
| CN104777346A (en) * | 2015-04-03 | 2015-07-15 | 吉林大学 | Broadband differential current proportion error measurement device and method thereof as well as self-checking method |
| CN104880686A (en) * | 2015-05-12 | 2015-09-02 | 贵州电力试验研究院 | Device and method for checking portable electronic current transformer |
| CN105158723A (en) * | 2015-07-30 | 2015-12-16 | 贵州电力试验研究院 | Error evaluation system and method for digital electric energy metering system |
-
1997
- 1997-08-27 CN CN 97109217 patent/CN1057160C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6479691B1 (en) | 1998-04-23 | 2002-11-12 | Mitsubishi Rayon Co., Ltd. | Catalyst for producing unsaturated nitrile |
| CN101556320B (en) * | 2009-04-30 | 2011-10-26 | 厦门红相电力设备股份有限公司 | On-site calibrating method and device of capacitor voltage transformer |
| CN102087347B (en) * | 2009-12-08 | 2013-05-29 | 张建 | Charged test method for current transformer and application thereof |
| CN102043139A (en) * | 2010-12-16 | 2011-05-04 | 中国人民解放军空军工程大学 | Calibration device of current transformer and method for calibrating current transformer by using same |
| CN102043139B (en) * | 2010-12-16 | 2013-03-27 | 中国人民解放军空军工程大学 | Calibration device of current transformer and method for calibrating current transformer by using same |
| CN102445622A (en) * | 2011-12-12 | 2012-05-09 | 河南省电力公司洛阳供电公司 | Portable tester for volt-ampere characteristic of current transformer |
| CN103439682A (en) * | 2013-09-16 | 2013-12-11 | 国家电网公司 | Portable current transformer composite error testing device and method for testing composite error of current transformer by utilizing portable current transformer composite error testing device |
| CN103439682B (en) * | 2013-09-16 | 2015-11-04 | 国家电网公司 | A kind of portable type current transformer combination misalignment proving installation is adopted to carry out the method for methods of composite errors on current transformer test |
| CN104062621A (en) * | 2014-06-12 | 2014-09-24 | 山东省计量科学研究院 | Isolation voltage mutual inductor error checking method and checking system |
| CN104777346A (en) * | 2015-04-03 | 2015-07-15 | 吉林大学 | Broadband differential current proportion error measurement device and method thereof as well as self-checking method |
| CN104777346B (en) * | 2015-04-03 | 2017-08-04 | 吉林大学 | Broadband difference current proportional error measurement apparatus and method and self checking method |
| CN104880686A (en) * | 2015-05-12 | 2015-09-02 | 贵州电力试验研究院 | Device and method for checking portable electronic current transformer |
| CN104880686B (en) * | 2015-05-12 | 2019-04-26 | 贵州电力试验研究院 | A kind of portable electronic piece formula current transformer calibration device and method |
| CN105158723A (en) * | 2015-07-30 | 2015-12-16 | 贵州电力试验研究院 | Error evaluation system and method for digital electric energy metering system |
| CN105158723B (en) * | 2015-07-30 | 2019-02-15 | 贵州电力试验研究院 | A kind of error evaluation system and method for digitalized electric energy metering system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1057160C (en) | 2000-10-04 |
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