Distribution transformer rated capacity verification method convenient for field test

Abstract

A distribution transformer rated capacity verification method convenient for field test comprises the steps: measuring the DC resistance Rt1 of a high-voltage winding and a low-voltage winding of a distribution transformer, calculating the copper loss Pr of the distribution transformer under different rated currents, and converting the copper loss Pr into the copper loss Prt at a reference temperature; calculating the percentage of the copper loss Prt in the corresponding load loss standard value; and comparing the percentages, and judging that the corresponding rated capacity closest to 90% is the rated capacity SN of the distribution transformer. By adopting the method to verify the rated capacity of the distribution transformer, the distribution transformer with small charge or small charge can be tested, and the rated capacity test result is accurate. And only one direct-current resistance tester is needed for testing, so that the tester is convenient to carry and very suitable forfield testing.

Description

technical field [0001] The invention relates to a method for verifying the rated capacity of a distribution transformer which is convenient for on-site testing, and belongs to the technical field of transformers. Background technique [0002] The rated capacity of the transformer refers to the ability of the transformer to carry the load for a long time. Under normal circumstances, the capacity specified on the nameplate of the transformer is the rated capacity, but the following situations exist in the procurement and operation of distribution transformers: (1) When purchasing distribution transformers, some unscrupulous suppliers use small ones to fill large ones in order to save costs, Use small-capacity transformers to replace large-capacity transformers for supply, resulting in heavy overload operation, which is very easy to burn out due to overcurrent. (2) In order to reduce the cost of electricity consumption, some special users (two-part electricity price system) de...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the capacity specified on the nameplate of the transformer is the rated capacity, but the following situations exist in the procurement and operation of distribution transformers: (1) When purchasing distribution transformers, some unscrupulous suppliers use small ones to fill large ones in order to save costs, Use a small-capacity transformer to replace a large-capacity transformer for supply, resulting in heavy overload operation, which is very easy to burn out due to overcurrent

(2) In order to reduce the cost of electricity consumption, some special users (two-part electricity price system) deliberately report and install large-capacity transformers as small-capacity transformers, resulting in loss of electricity charges for power supply companies

[0004] At present, the relevant transformer standards have not clearly stated the rated capacity measurement method, that is, it is impossible to directly judge whether the rated capacity of the transformer nameplate is the rated capacity of the transformer

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