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Phase switching circuit for transformer transformation ratio measurement

A technology for switching circuits and transformers

Inactive Publication Date: 2016-11-16
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The wiring operation is cumbersome, time-consuming and laborious, and the test efficiency is low;
[0005] (2) Manual reading of high and low voltage voltage values, the introduction of random errors has a great impact on the measurement results;
[0006] (3) Three-phase 380V power supply is used for measurement, the asymmetry of power supply voltage will increase the measurement error and the measurement range is narrow

Method used

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  • Phase switching circuit for transformer transformation ratio measurement

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Effect test

Embodiment Construction

[0017] like figure 1 As shown, the automatic phase commutation circuit for transformer ratio measurement of the present invention is composed of filter resistor R1, filter capacitors C1~C3, variable capacitor YM1, voltage transformer PT, A / D converter, high voltage phase switching relay matrix unit JH 1. The low-voltage phase switching relay matrix unit JL, the voltage divider circuit and the transformer T are connected.

[0018] The filter resistor R1 is connected in series with the positive terminal of the single-phase power supply U.

[0019] The filter capacitor C1 is connected in parallel to the positive and negative poles of the single-phase power supply U, the filter capacitor C2 is connected in parallel to the low-voltage signal input terminal of the A / D converter and grounded, and the filter capacitor C3 is connected in parallel to the voltage of the low-voltage phase switching relay matrix unit JL output.

[0020] The variable capacitor YM1 is connected in parallel...

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PUM

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Abstract

The invention relates to a phase switching circuit for transformer ratio measurement, which is mainly composed of filter resistor R1, filter capacitors C1~C3, variable capacitor YM1, voltage transformer PT, A / D converter, high voltage phase switching circuit The relay matrix unit JH, the low-voltage phase switching relay matrix unit JL, the voltage dividing circuit and the transformer T are connected. The structure design of the invention is simple and reasonable, and can simultaneously complete the three-phase transformation ratio measurement of the transformer, which solves the large measurement error caused by the asymmetry of the three-phase voltage, ensures the symmetry of the test power supply, and can improve the transformation ratio measurement accuracy and transformation ratio measurement Work efficiency, suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of electric power detection, and in particular relates to a phase-differential switching circuit for transformer ratio measurement. Background technique [0002] The transformation ratio of a power transformer refers to the ratio of the primary side voltage U10 to the secondary side voltage U20 when the transformer is no-loaded, referred to as the transformation ratio. Three-phase transformer transformation ratio measurement is performed with three-phase power supply. Generally, a three-phase power supply with a line voltage of 380V is used, and the voltage of the three-phase power supply is required to be symmetrical, otherwise measurement errors will occur. The measured voltage should not be lower than 1% of the rated voltage of the measured transformer, and should be kept as stable as possible, and the voltage indication values ​​on both sides of the high and low voltage should be read at the same time. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/20
CPCG01R29/20
Inventor 贾俊徐进东邹杰
Owner STATE GRID CORP OF CHINA
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