A test method for capacitive voltage transformer

Abstract

The invention discloses a capacitive-type voltage transformer testing method. The method employs a CVT structure and wave transmission characteristics, carries out voltage increase testing through a central node between the CVT capacitive unit and an electromagnetic unit, records the voltage of the central node, a CVT output voltage, and the current of an injection node, calculates and obtains transmission characteristics, similar to actual working conditions, of a CVT. The method effectively solves a problem that a conventional testing method cannot carry out testing under special conditions because the level of a needed voltage is too high or the capacity of a needed power supply is too large, accurately obtains the overall transmission characteristics of the CVT under the conditions that the transmission characteristics are not affected and the rated condition of the electromagnetic unit of the CVT is precisely simulated, and remarkably reduces the requirements for the voltage level and the capacity of the power supply during the high-voltage testing of the CVT.

Description

technical field [0001] The invention belongs to the field of capacitive voltage transformers, and more specifically relates to a test method for capacitive voltage transformers. Background technique [0002] Compared with the traditional electromagnetic voltage transformer (IVT), the capacitive voltage transformer (CVT for short) has the advantages of high insulation strength, can reduce the steepness of lightning shock wave, low cost, and can also be used as a coupling capacitor for power line carrier communication. , Widely used in power grids with voltage levels of 35kV and above. When the primary system fails or suffers from transient intrusion waves, since the CVT contains energy storage elements such as capacitors and damping reactors, the output voltage on the secondary side cannot reflect the change in the input voltage on the primary side in a timely and accurate manner, and the transient response is poor. , and the transmission characteristics of CVT to harmonics ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a test method for a capacitive voltage transformer, which can accurately obtain the overall transfer characteristics of the CVT, and significantly reduces the voltage level and power supply during the high-voltage test of the CVT. capacity requirements, which effectively solves the problem that the traditional test method cannot be tested due to the high voltage level required and the large power supply capacity under special circumstances.

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