Large oil-immersed transformer empty and load comprehensive test equipment and method

Abstract

Large-scale oil-immersed transformer empty-load comprehensive test equipment, large-scale oil-immersed transformer empty-load comprehensive test equipment is divided into test power supply part and measurement system; test power supply part includes induction voltage regulator, intermediate transformer, oil Immersion intensive compensation capacitor bank and test control system; measurement system includes precision measurement current transformer, voltage transformer and power analyzer. It is able to conduct on-site no-load and load loss measurement tests for 110kV and 220kV voltage level transformers, and can complete transformer no-load current measurement, transformer no-load loss measurement, transformer no-load harmonic measurement, transformer short-circuit impedance measurement and transformer load loss measurement, and It has the function of automatic calculation of empty and load loss measurement test results.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment testing, in particular to field application devices for no-load and load tests of oil-immersed transformers with voltage levels of 110kV and 220kV. Background technique [0002] Transformer no-load and load tests are important test items for oil-immersed power transformers. The no-load test generally applies a sine wave of rated voltage and rated frequency from the winding with a lower voltage, and the other windings are open-circuited, and the transformer loss and excitation current are measured under this condition. Whether there is a defect in the magnetic circuit of the transformer can be checked through the no-load test. The load test generally applies an AC voltage of rated frequency to the high-voltage winding of the transformer, so that the current in the winding reaches the rated value, the low-voltage side winding is short-circuited, and other windings (if any)...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual field, due to the large capacity of the transformer under test, especially for large oil-immersed power transformers, the capacity of the field test power supply required is large, so each test requires a huge investment in test equipment, which not only occupies an area The area is large, and transportation, handling, and wiring are very inconvenient, and it also increases the error of test measurement and calculation

In recent years, research institutions at home and abroad have conducted tentative research on the complete set of oil-immersed transformer no-load test equipment, but due to insufficient capacity of the test equipment, low measurement accuracy and imperfect control system, it has not been widely used in actual production. middle

Images