Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof

A technology of current transformer and test method, applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of injury to equipment and persons, burns of wiring busbars, and bulky test equipment, so as to improve work efficiency and save time. , measure the precise effect

Inactive Publication Date: 2013-09-04
HANGZHOU KAIDA ELECTRIC POWER CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings: first, the test equipment is bulky and the process is complicated; second, when the current is increased, sometimes thousands of amperes are required, if the wiring is not reliable, it will cause severe arcing, which will hurt equipment and people; third, add DC during the test. The moment of voltage will cause burns on the rheological terminal busbar

Method used

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  • Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof
  • Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof
  • Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof

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Embodiment 1

[0012] Embodiment 1: with reference to attached Figure 1-4 . A current transformer transformation ratio polarity rapid tester includes a current transformer transformation ratio tester. The current transformer transformation ratio tester belongs to the prior art and will not be described here. The signal output end of the current transformer ratio tester is connected one way to the signal input end of the excitation voltage display, one way to the signal input end of the transformation ratio display, and one way to the signal input end of the primary voltage display.

[0013] figure 1 Middle: 1. Excitation voltage U 2 Display window; 2. Volt-ampere voltage input terminal; 3. Ratio display window; 4. Excitation voltage U 2 Output terminal; 5. Secondary rated current selection current transformer; 6. Primary voltage U 1 Input terminal; 7. Primary voltage U 1 Display window; 8. Ground terminal; 9. Power input socket; 10. Power on; 11. Polarity indicator light; 12. Continuou...

Embodiment 2

[0015] Embodiment 2: On the basis of embodiment 1, a kind of testing method of current transformer transformation ratio polarity rapid tester, the voltage output by the volt-ampere tester is input to the volt-ampere voltage input end of this tester, by S 1 , S 2 Output excitation voltage U 2 To the secondary coil of the current transformer, the primary side of the current transformer is input to the primary voltage U of the tester 1 Input terminal, volt-ampere input to excitation voltage U 2 A small current transformer is connected in series at the output end to monitor the volt-ampere current I; U 2 , I, and U 1 Respectively through the corresponding range switching circuit, buffer amplifier circuit and AD sampling, and sent to the CPU through photoelectric isolation, the CPU measures the amplitude of the three signals, U 2 and U 1 It is also transformed into a square wave by the waveform conversion circuit, and sent to the CPU after photoelectric isolation for measuring...

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Abstract

The invention relates to a fast testing instrument of the variable ratio and the polarity of a current transformer and a testing method thereof. According to the invention, not only can the time for testing the variable ratio and the polarity of the current transformer be shortened from about 50min to about 25min, but also the invention has the advantages of small size, convenience in carrying, high in measuring accuracy, safety and reliability. The testing method comprises the following steps: the voltage outputted by a volt-ampere tester is inputted to a volt-ampere voltage input end of the tester, an exciting voltage U2 is outputted to a secondary coil of the current transformer by S1 and S2; a primary side of the current transformer is inputted to the input end of a primary voltage U1 of the testing instrument; volt and ampere are inputted to the output end of the exciting voltage U2, and then a small current transformer is connected in series and is used for monitoring volt-ampere current I; U2, I and U1 are respectively sampled by a corresponding range switching circuit, a corresponding buffering and amplifying circuit and an corresponding AD, and are transmitted to a CPU (Central Processing Unit) by optoelectronic isolation; the CPU measures amplitudes of three paths of signals; and the U2 and the U1 are also changed into square waves through a waveform converting circuit, the square waves are transmitted to the CPU through the opoelectronic isolation to be used for measuring the phase difference of the U2 and the U1, so as to judge the polarity of the current transformer.

Description

technical field [0001] The invention relates to a current transformer transformation ratio which can not only shorten the transformation ratio and polarity test time of the current transformer from about 50 minutes to about 25 minutes, but also has the advantages of small size, portability, high measurement accuracy, safety and reliability The invention relates to a quick polarity tester and a test method, which belong to the field of high voltage and current tester manufacturing. Background technique [0002] CN102780234A, titled "High-voltage Electrical Commissioning Method for Power Generation Engineering", the commissioning method includes commissioning preparation, high-voltage equipment static test and commissioning, generator static test and commissioning, PT nuclear phase, start-up test, dynamic orientation and power generation grid connection, and is characterized in that :······························································································...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02G01R31/06
Inventor 沈国芳董建祥马建艳卢培宏王伟汪晓俊诸葛赞何楼巍高峰
Owner HANGZHOU KAIDA ELECTRIC POWER CONSTR
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