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A Method for Quickly Measuring the DC Resistance of Transformer's Delta Connection Winding

A wiring method and technology of DC resistance, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve the problems of difficult judgment, slow measurement speed of transformer delta connection winding, etc., to avoid economic losses and save tests. Time and labor costs, the effect of improving test efficiency

Active Publication Date: 2016-06-08
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly aims at the problem that the measuring speed of the delta-connected winding of the transformer is slow and it is difficult to judge the defect, and proposes a test method for quickly measuring the DC resistance of the delta-connected winding, which can improve the efficiency of field tests, save test time, and accurately judge defects

Method used

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  • A Method for Quickly Measuring the DC Resistance of Transformer's Delta Connection Winding
  • A Method for Quickly Measuring the DC Resistance of Transformer's Delta Connection Winding
  • A Method for Quickly Measuring the DC Resistance of Transformer's Delta Connection Winding

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Embodiment Construction

[0019] See figure 1 , figure 2 , the implementation steps of the present invention are as follows:

[0020] The first step is to connect the test circuit with the current source to the two ends of one phase winding of the delta connection winding to be tested, and connect the ammeter connected in parallel through the switch at the other end of the winding of the other phase;

[0021] The second step is to apply a current source on the tested winding, measure the voltage across the tested winding and the current flowing through the tested winding, and read the current value of the ammeter connected in parallel to determine the resistance value of the two-phase winding;

[0022] The third step, after the test data is stable, turn on the switch through the control system, jump off the parallel ammeter, and continue to measure the voltage at both ends of the tested winding and the current flowing through the tested winding;

[0023] The fourth step, after the test data is stabl...

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Abstract

A method for fast measuring transformer triangular wiring winding direct-current resistance is characterized by including the steps of firstly, connecting a test loop with a current source to two ends of a to-be-measured triangular wiring winding, and parallelly connecting a ampere meter to two ends of other winding through a switch; secondly, applying the current source to the to-be-measured winding, measuring voltage at two ends of the to-be-measured winding, and simultaneously reading current vale of the parallel ampere meter to determine resistance of the two windings; thirdly, when to-be-measured data is stable, turning on the switch through a control system to skip the parallel ampere meter so as to continue data measuring; and fourthly, when to-be-measured data is stable, calculating to obtain phase resistance of a three-phase resistor after the test. By the method, field test efficiency is improved, test time is saved, and defects can be judged accurately.

Description

technical field [0001] The invention relates to a method for quickly measuring the DC resistance of windings in a delta connection mode of a transformer, which is suitable for conventional handover tests and pre-test inspections of transformers, and is especially suitable for DC with many switching positions of Dy-type high-voltage windings in distribution transformers. It is used in resistance testing and belongs to the field of operation and maintenance of substation equipment. Background technique [0002] With the rapid development of my country's industrial economy, the demand for electricity is increasing rapidly, and the requirements for reliable power supply are also increasing. The power transformer is one of the important components of the power grid, and plays an extremely important role in the safe and reliable power supply of the power grid. In order to ensure the safe and stable operation of the transformer, it is necessary to carry out pre-test and inspection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/14
Inventor 邹德旭钱国超王耀龙徐肖伟王景林
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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