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A method for testing the ratio and group of three-phase transformers and a hand-held tester

A three-phase transformer and transformer technology, used in the measurement of electrical variables, instruments, measuring devices, etc., can solve the problems of lack of lithium battery power supply, inability to be handheld, and complicated test procedures, and improve test efficiency and accuracy. , small size, simple circuit effect

Active Publication Date: 2022-05-13
WUHAN ZHIZHUO MEASUREMENT CONTROL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] None of the existing products have the power supply capability of lithium batteries, and the field test needs to use an external power supply, and it is only portable, and cannot be handheld
In addition, the existing equipment needs to be manually connected according to the test scenario and record the collected values ​​separately, and then further analyze and process the collected data. The test process is complicated and inefficient.

Method used

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  • A method for testing the ratio and group of three-phase transformers and a hand-held tester
  • A method for testing the ratio and group of three-phase transformers and a hand-held tester
  • A method for testing the ratio and group of three-phase transformers and a hand-held tester

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Embodiment Construction

[0090] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0091] The present invention provides a method of testing the ratio and group of three-phase transformers, comprising the following steps:

[0092] (1) Connect the output voltage of the handheld transformer ratio and the group tester to the AB phase winding of the three-phase transformer;

[0093] (2) Collect the voltage amplitude U of ab on the high-side of the three-phase transformer when the AB phase is added AB and phase Φ AB , the voltage amplitude of the high-side BC U BC and phase Φ BC The voltage amplitude of the ca on the high side is U CA and phase Φ CA , the voltage amplitude of the low-voltage side ab ab and phase Φ ab , the voltage amplitude of the low-voltage side bc U bc and phase Φ bc and the voltage amplitude U of the low-voltage side ca ca and phase Φ ca ；

[0094] (3) Connect the handheld transformer ratio and the output voltage of the group t...

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Abstract

The invention provides a method for testing the transformation ratio and group of a three-phase transformer and a hand-held tester. The hand-held tester can be used to test the transformer, and the test values ​​of the AB phase, BC phase and CA phase are collected separately when they are powered on. Then call the comparison function, find out the corresponding model from the feature database, and determine the group type of the three-phase transformer under test. The invention does not need an external power supply when testing, can adapt to the situation that there is no external power supply in the test site, has a simple testing method, realizes blind testing, and improves testing efficiency.

Description

Technical field [0001] The present invention relates to a method for testing the ratio and group of three-phase transformers and handheld testers, belonging to the field of instrumentation technology. Background [0002] The purpose of measuring the DC resistance of the transformer winding is to check whether the welding quality of the winding joint and the winding have a short circuit between turns; whether the contact between the various positions of the voltage tap change is good and whether the actual position of the tap changer is consistent with the indicated position; whether the lead line is broken; whether the winding winding of the multi-stranded wire is broken. The DC resistance time-varying voltage converter of the transformer winding is an indispensable test item after handover, overhaul and change of the tap-changer, and it is also an important inspection item after failure. [0003] The transformer windings can be thought of as equivalent circuits of the inductor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/20
CPCG01R29/20
Inventor 曹建波
Owner WUHAN ZHIZHUO MEASUREMENT CONTROL TECH
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