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
CN103176048BActive Publication Date: 2016-06-08YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
Publication Date
2016-06-08

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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.
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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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