On-site CVT integrated verification system

Abstract

The invention provides an on-site CVT integrated verification system, which comprises a test power supply, a standard appliance, a measuring apparatus and a vehicle-mounted test platform. The test power supply consists of a series reactor, an exciting transformer and a voltage regulator; the standard appliance comprises a high-tension bushing, a standard voltage transformer and a standard capacitor, wherein the high-tension bushing, the standard voltage transformer, the standard capacitor and the series reactor are designed into an integrated sulfur hexafluoride SF6 closed combined electrical apparatus (GIS); and the standard voltage transformer is designed into an SF6 gas insulated reclining posture type structure. The system of the invention can conveniently, accurately and reliably verify the ratio error of on-site 220Kv to 500 Kv CVT (capacitor voltage transformer), the capacitance of a capacitive divider, the medium loss, and the like without unloading from a vehicle. The additional error guided by the measuring system is relatively fixed and is easy to measure, wherein the variation thereof is less than or equal to 0.02 percent.

Description

technical field [0001] The invention relates to an on-site CVT integrated verification system, which belongs to the field of calibration, verification and detection of electric equipment. Background technique [0002] CVT (capacitive 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 capacitor voltage divider is composed of a porcelain sleeve and a number of series capacitors installed in it. The transformer in the sealed oil tank is composed of a compensation reactor and a damping device, and the resonance is suppressed by the damping device, and the damping device is composed of a resistor and a reactor. In power plants and substations, it is very necessary to conduct reliability and safety tests on CVTs in operation to reduce the probability of accidents. In recent years, with the continuous reform of the power industry, power generation and transmission a...

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, as the CVT voltage level increases, the size of the test equipment becomes larger, and this method restricts the on-site verification work more and more.

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