Power frequency test transformer high-voltage winding head-end current monitoring device and method

Abstract

The present invention discloses a power frequency test transformer high-voltage winding head-end current monitoring device and method. The monitoring device is composed of a high-potential current measurement part and a low-potential waveform reduction part; the high-potential current measurement part of the monitoring device is composed of a current sensor, a data acquisition unit, an optical fiber extender, a storage battery, a tray carrying a battery compartment, a connecting guide rod and a shielding shell; and the high-potential part and the low-potential part are connected with each other through an optical fiber so as to realize data and control signal transmission. With the power frequency test transformer high-voltage winding head-end current monitoring device and method of the invention adopted, power frequency test transformer high-voltage winding head-end steady and transient current waveforms in each test process can be monitored. The high-potential current measurement part is arranged in the shielding shell and adopts the optical fiber to transmit data, and therefore, electromagnetic interference can be effectively shielded. The monitoring device has a compact structure, so that the space of a laboratory can be saved; the monitoring device is not limited by test voltage levels; the power frequency test transformer high-voltage winding head-end current monitoring device is powered by the storage battery and can realize real-time monitoring for 10 hours; and the monitoring device has the advantages of reusability, long service life, convenient manufacture, low maintenance cost and the like.

Description

technical field [0001] The invention belongs to the technical field of monitoring and protection of the operating state of electrical testing equipment, and relates to a device and method for monitoring the head-end current of a high-voltage winding of a power frequency test transformer. Background technique [0002] At present, the products that use power frequency test transformers for testing and testing involve high-voltage AC and DC power transmission and transformation equipment. The high-frequency transient overvoltage transmitted from the test circuit may be extremely unevenly distributed among the turns of the transformer and cause damage to the transformer, so each test circuit is designed with protective measures. However, at present, the primary current, secondary current, primary voltage, and secondary high voltage routinely measured for power frequency test transformers are all steady-state power frequency parameters, which cannot reflect the transient state of...

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention discloses a device and method for monitoring the head-end current of the high-voltage winding of a power frequency test transformer.

Images