On-vehicle easy-maintenance voltage transformer error calibration system and method thereof

Abstract

The invention discloses an on-vehicle easy-maintenance voltage transformer error calibration system and a method thereof. The on-vehicle easy-maintenance voltage transformer error calibration system and the method belong to the technical field of mutual inductor testing. The on-vehicle easy-maintenance voltage transformer error calibration system provided by the invention comprises an on-vehicle platform on which a standard voltage transformer, a test booster and a test box are arranged. The standard voltage transformer is an infrared epoxy barrel type standard voltage transformer. The test booster is an infrared epoxy barrel type standard test booster. A voltage regulating control power supply is fixedly arranged in the test box. The test box is internally provided with a mutual inductor calibrator, a voltage load box, a remote controller and a connecting line. A multi-combined compensating reactor is arranged in the voltage regulating control power supply. The error calibration system provided by the invention can be used for field calibration of a 500kV-220kV voltage transformer. The height of on-vehicle system in a transportation state is only 2.2m. The on-vehicle easy-maintenance voltage transformer error calibration system has advantages of facilitating mobile transportation and traceablility maintenance, realizing high safety and high efficiency in use, and obtaining high stability and high reliability of the error data of the standard voltage transformer.

Description

technical field [0001] The invention belongs to the technical field of transformer testing, and in particular relates to a vehicle-mounted easy-maintenance voltage transformer error checking system and a method thereof. Background technique [0002] The metering transformer is an important part of the power transmission metering unit. The accuracy of its metering is related to the fairness and justice of trade settlement. Therefore, it is very important to accurately check the error of the metering transformer. In order to ensure the accuracy of measuring transformers, the country mandates error verification of measuring transformers. Measurement transformers are installed equipment and fixed on site, so they can only be checked for errors on site. The corresponding verification regulations JJG1021-2007 "Power Transformers" need to transport the corresponding test equipment and instruments to the test site. on site. [0003] For the error calibration of 500kV voltage trans...

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Problems solved by technology

The reactive power compensation device in the on-vehicle automatic calibration device of the power transformer disclosed in this patent does not perform reactive power compensation on the SPWM program-controlled stable power supply and the generator. 5000kV capacitive voltage transformer with 5000pF is used for error verification, at least 200kVA SPWM program-controlled stable power supply and generator are required. 200kVA generator generally weighs more than 2 tons, and its volume is generally about 2m*1m*2m. 200kVA SPWM The weight of the program-controlled stable power supply is also more than 1 ton, and the van cannot load such oversized and overweight equipment

Therefore, the vehicle-mounted on-site automatic calibration device for power transformers disclosed in this patent is only suitable for low-voltage and low-power transformer error calibration systems, and cannot perform on-site error calibration for 500kV voltage transformers, and the on-board power transformers disclosed in this patent The automatic calibration device is powered by a generator, and the output voltage frequency of the generator is unstable, generally fluctuating within 40~60Hz, while the difference measurement system strictly requires the system frequency to be kept at 50Hz±0.5Hz, so the on-board power transformer disclosed in this patent The automatic calibration device cannot provide a high-quality power supply that meets the on-site error calibration of the transformer, which may affect the accuracy of the error measurement data of the measurement system

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