Field load testing device for power transformer

Abstract

The invention discloses a field load testing device for a power transformer. The field load testing device for the power transformer is used for testing the tested transformer and comprises a power supply, a high-voltage switch cabinet, an induction voltage regulator, an intermediate transformer, a compensating capacitor bank, a mutual inductor precision measurement unit and complete testing control system equipment, wherein one side of the high-voltage switch cabinet is connected with the power supply, and the other side of the high-voltage switch cabinet is connected with the induction voltage regulator; the induction voltage regulator, the intermediate transformer, the compensating capacitor bank and the mutual inductor precision measurement unit are sequentially connected through a line. The field load testing device for the power transformer has the functions of computing and controlling an input voltage assembly and a capacity assembly of the compensating capacitor bank, and the requirement on the capacity of a field test power supply is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment testing, in particular to a field application device for power transformer load testing. Background technique [0002] In recent years, with the rapid development of the power system, users have higher and higher requirements for the economical and reliable operation of high-voltage electrical equipment, especially power transformers. The load loss of the transformer is a key technical indicator, which is of great significance to the economic operation of the transformer and the service life of the transformer itself; and the short-circuit impedance determines the impact of the transformer on the grid voltage fluctuation and the occurrence of transformer failures during the operation of the power system. The size of the electromotive force in the case of an outlet short-circuit accident, and the short-circuit impedance is also a necessary condition for determining whether...

AI Technical Summary

Problems solved by technology

[0004] In the field test, due to the large short-circuit capacity of the tested transformer, the capacity of the required test power supply is often difficult to meet the requirements, and the matching test devices such as induction voltage regulators, intermediate transformers, etc. are not suitable for field tests.

Due to the limitations of technical factors such as high field test voltage, large test current, and high test accuracy requirements, in the past, there were few large-scale transformer load test assessments in the operation site, and there was a lack of load test devices that can effectively test the quality of power transformer windings from the perspective of load loss.

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