Converter transformer symmetrical voltage boosting no-load test circuit

Abstract

The invention discloses a converter transformer symmetrical voltage boosting no-load test circuit. The converter transformer symmetrical voltage boosting no-load test circuit comprises a variable-frequency power supply cabinet, an excitation transformer T1 and an excitation transformer T2 which are of the same structure, three-order harmonic filters, five-order harmonic filters, a converter transformer, a voltage transformer TV and a current transformer TA; one three-order harmonic filter and one five-order harmonic filter are connected in parallel between an A end and a B end as well as between a C end and a D end respectively; a grid-side bushing of the converter transformer is suspended; two ends of a valve-side bushing of the converter transformer are respectively connected with the A end and the C end; the primary winding of the current transformer TA is connected in series with the A end or on a connecting line between the C end and the valve-side bushing of the converter transformer; and two ends of the primary winding of the voltage transformer TV are respectively connected with the A end and the C end. According to the converter transformer symmetrical voltage boosting no-load test circuit of the invention, the three-order harmonic filters and the five-order harmonic filters are adopted to effectively filter out harmonic generated in the converter transformer in a no-load test, and the excitation transformers and the capacity of a variable-frequency power supply can be effectively used.

Description

technical field [0001] The invention relates to a test circuit which can be used in the factory test of a converter transformer and the no-load test after on-site maintenance. The bushing on the valve side is symmetrically pressurized, and has the functions of low equipment voltage, convenient movement, and convenient on-site use. Background technique [0002] At present, the no-load test of domestic converter transformers after leaving the factory and on-site maintenance generally adopts the unilateral pressurization method on the valve side. Among them, the factory test adopts the power supply method provided by the generator, and the test after on-site maintenance adopts the variable frequency power supply method. Their problem is that the ex-factory test equipment cannot be moved to the site for testing because the generator is used to provide power, and the operation and maintenance of the generator itself is very complicated, and the no-load test after on-site maintenan...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of inability to move and difficult maintenance caused by the use of generator power supply in most of the existing no-load tests of converter transformers, this method uses a variable frequency power supply device, which is convenient to move and uses three-phase 10kV power supply, which has a large power supply and does not exist Three-phase unbalance problem

Secondly, in order to overcome the difficulty of transportation during on-site use, this method adopts the bilateral pressurization method of two excitation transformers, which can greatly reduce the volume of the excitation transformer and the height of the bushing, and facilitate transportation and on-site installation

Images