Short circuit preventive device for secondary winding of voltage transformer

Abstract

The invention provides a short circuit preventive device for a secondary winding of a voltage transformer. The short circuit preventive device is mounted between the secondary winding of the voltage transformer and a measuring loop of a sampling unit of the voltage transformer, and comprises an air switch, a binding post and a protective circuit board; the protective circuit board comprises major-loop resistors, protective resistors, LEDs and fuses; and the wire inlet end of the air switch is connected to live and zero wires of the secondary winding of the voltage transformer, the wire outlet end of the air switch is connected to one end of each major-loop resistor, the other end of each major-loop resistor is connected to one end of the corresponding fuse, the other end of each fuse is connected to the wire inlet end of the binding post while being connected to one end of the corresponding protective resistor or the anode of the corresponding LED, the other end of each protective resistor or the cathode of each LED is connected to the wire inlet end of the binding post, and the wire outlet end of the binding post is connected to live and zero wires of the measuring loop of the sampling unit of the voltage transformer. Thus, the hidden safety hazard that short circuit of a test loop causes short circuit of the secondary winding of the voltage transformer can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a short-circuit prevention device for a secondary winding of a voltage transformer. Background technique [0002] Capacitive equipment insulation on-line monitoring system is mainly to measure tgδ, Cx (pF) of 220kV main transformer bushing, current transformer, coupling capacitor and other capacitive equipment, as well as resistive current and full current of zinc oxide arrester, and analyze the above data by comparison Comprehensively judge the insulation status of capacitive equipment. [0003] The capacitive equipment insulation on-line monitoring system mainly measures the bus voltage vector and the leakage current vector flowing through the tested product through the voltage transformer sampling unit and the tested equipment sampling unit, and then inputs all test signals into the host through the cable channel for data processing and Analysis cal...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an anti-short circuit device for the secondary winding of a voltage transformer to solve the problem of burning the voltage transformer due to a short circuit of the secondary winding of the voltage transformer

Images