Apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and method

Abstract

The invention discloses an apparatus for large-scale oil-immersed transformer no-load and on-load comprehensive tests and a method. The apparatus is composed of a test power source part and a measurement system. The test power source part includes an induction regulator, an intermediate transformer, an oil-immersed intensive compensation capacitor bank and a test control system which are successively connected via a circuit. The measurement system includes a precision measurement current transformer, a voltage transformer and a power analyzer. The apparatus can conduct on-site no-load and on-load loss measurement tests on 110-kV and 220-kV voltage class transformers, and can complete measurements of no-load current, no-load loss, no-load harmonic waves, short circuit impedance and load loss of transformers, and can automatically calculate the measurement test results of no-load and load loss.

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)...

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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

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