A method for error calibration of vehicle-mounted easy-to-maintain voltage transformers

Abstract

The invention discloses an error calibration method for a vehicle-mounted easy-to-maintain voltage transformer, which belongs to the technical field of transformer testing. The vehicle-mounted easy-maintenance voltage transformer error checking system of the present invention includes a vehicle-mounted platform, on which a standard voltage transformer, a test booster and a test box are arranged, and the standard voltage transformer is an inflatable epoxy barrel type Standard voltage transformer, the test booster is an inflatable epoxy barrel test booster, the test box is fixed with a voltage regulation control power supply, and the test box is also equipped with a transformer calibrator and a voltage load box , a remote controller and connecting wires, the multi-combination compensating reactor is set in the voltage regulation control power supply. The error calibration system of the present invention can be used for on-site calibration of 500kV-220kV voltage transformers. The height of the vehicle-mounted system is only 2.2m in the transportation state. The system is convenient for mobile transportation and traceability maintenance. The data is stable and reliable.

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...

AI Technical Summary

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 frequency of the output voltage of the generator is unstable, generally fluctuating within 40-60 Hz, while the difference measurement system strictly requires the system frequency to be kept at 50 Hz ± 0.5 Hz, 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

Images