Integrated standard device for field calibration of extra/ultra high voltage capacitor voltage transformer (CVT)

Abstract

The invention provides an integrated standard device for field calibration of an extra / ultra high voltage capacitor voltage transformer (CVT). The device comprises a test power supply, a test lifting platform, a standard appliance, a measuring instrument and a vehicle platform, wherein the test power supply comprises cascade upper and lower level test transformers, a secondary compensating reactor and a voltage regulator; the standard appliance comprises cascade upper and lower level standard voltage transformers and a high voltage isolated transformer; the test lifting platform comprises a base, transmission mechanisms and insulating support members; the measuring instrument comprises a transformer calibrator and load boxes; all the equipment is fixedly installed on the vehicle platform;and the test lifting platform can lift in the vertical direction. The upper and lower level standard voltage transformers in the standard device can troubleshoot the standard device by way of mutual calibration in the field and complete field calibration of the extra / ultra high voltage CVT, without unloading.

Description

technical field [0001] The invention relates to an integrated standard device for on-site verification of CVT, which belongs to the field of calibration, verification and detection of electric equipment, and in particular to an integrated standard device for on-site verification of super / ultra-high voltage CVT. Background technique [0002] With the rapid development of my country's power grid technology, the focus of my country's power grid construction will shift to large-scale, long-distance UHV backbone networks and smart grid construction based on this. Capacitor Voltage Transformer (CVT, Capacitor Voltage Transformer) is an important electrical equipment in the power grid. It is mainly composed of a capacitor voltage divider and a medium-voltage transformer. The transformer is composed of a transformer installed in a sealed oil tank, a compensation reactor and a damping device. The damping device is used to suppress resonance, and the damping device is composed of a re...

AI Technical Summary

Problems solved by technology

However, because this method has to go through a series of cumbersome steps of unloading-assembly-checking-loading, it is easy to cause damage to the test equipment, and it also wastes huge manpower and material resources. The relative positions of the power supply, standard instruments and measuring instruments are not the same, which increases the uncertainty of the distribution parameters, thus causing the additional error introduced by the measurement system to be very unstable, sometimes seriously affecting the measurement results and even affecting the test results. Judgment of product performance

Moreover, the higher the CVT voltage level, the greater the volume and weight of the test equipment, and the more difficult it is for this unmountable calibration method to meet the requirements for measurement accuracy and work efficiency in the field calibration of 500kV~1000kV CVT

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