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Nonstandard variable ratio voltage transformer calibrating method

A technology of voltage transformer and standard voltage, applied in instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as inaccurate results, achieve broad application prospects and improve the effect of verification accuracy

Active Publication Date: 2015-04-01
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] The invention provides a verification method for a voltage transformer with a non-standard transformation ratio to solve the problem of inaccurate results when verifying a voltage transformer with a transformation ratio different from that of a standard device

Method used

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  • Nonstandard variable ratio voltage transformer calibrating method
  • Nonstandard variable ratio voltage transformer calibrating method
  • Nonstandard variable ratio voltage transformer calibrating method

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Embodiment Construction

[0039] (1) Use each voltage level standard device to divide the voltage segment to realize the verification of the non-standard transformation ratio voltage transformer in the voltage segment from this standard voltage to the next standard voltage; it is necessary to ensure the accuracy level of each voltage level standard device It is three grades or more higher than the accuracy grade of the voltage transformer under inspection or accurately calibrates the error of the standard device in the test voltage section of the voltage transformer under inspection;

[0040] (2) The verification wiring is exactly the same as the current application of the standard device to directly verify the standard transformation ratio voltage transformer verification method,

[0041] (3) Correct the secondary voltage of the standard device and the tested voltage transformer to a voltage level, that is, the secondary voltage of the standard device U 02 multiplied by the factor Increased to the s...

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Abstract

The invention relates to a nonstandard variable ratio voltage transformer calibrating method and belongs to calibrating methods of voltage transformers. According to the method, nonstandard variable ratio voltage transformer calibration is achieved for all voltage sections from a standard voltage to the next standard voltage section by section by means of standard instruments of all voltage levels; the wiring method is completely identical to the wiring method used currently for standard variable ratio voltage transformer calibration achieved directly with a standard instrument, a standard instrument and the secondary voltage of a corresponding voltage transformer to be calibrated are corrected to be on the same voltage level, and the ratio difference fx' of the voltage transformer to be calibrated is obtained with the formula (11); the status quo that only standard variable ratio voltage transformers under special circumstances can be calibrated accurately with the standard instruments is broken through, and nonstandard variable ratio voltage transformers under general conditions can be calibrated directly with the standard instruments.

Description

technical field [0001] The invention belongs to a verification method of a voltage transformer. Background technique [0002] The verification work of the voltage transformer of the power metering verification institution is generally only equipped with high-voltage standard voltage transformers suitable for the voltage level of the power supply system within the working range of the region. For example, the standard voltage levels of the high-voltage system of the Northeast Power Grid are 10kV, 35kV, 66kV, 220kV and 500kV. Therefore, each power measurement and verification institution is only equipped with a test standard voltage transformer (hereinafter referred to as the standard device) that is compatible with it. [0003] However, there are many other voltage levels in the power system, such as the generator end of the power generation system, the factory system, and some special users (generally between 3kV and 55kV in Jilin Province). It is generally not within the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R35/02
Inventor 朱启贵于旭王佳颖
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
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