Transformer sampling circuit

Abstract

The invention discloses a transformer sampling circuit which comprises a sampling resistor arranged at the output end of the secondary side of a transformer. The transformer sampling circuit also comprises an open circuit judgment detection circuit formed by at least one voltage divider resistor and a switch tube, wherein the sampling resistor, the voltage divider resistor and the switch tube form a series branch. According to the transformer sampling circuit, targeted for the defects of connection of an electrical fire monitor detector and an electric leakage transformer at present, an online transformer test circuit is added; and the sampling resistor, the voltage divider resistor and the switch tube are utilized to form a series branch, and when the current is 0, the series branch is connected, and whether the transformer is open circuited or breaks down is judged by detecting the voltage value of the sampling resistor. The circuit is simple in structure and easy to control; debugging personnel are allowed to know the line condition between the electric leakage transformer and a connection detector visually, connection and disconnection of the electric leakage transformer can be displayed accurately, and the condition of the transformer can be known in the field debugging and operation process with great convenience.

Description

technical field [0001] The invention relates to a transformer sampling circuit. Background technique [0002] The electrical fire monitoring system belongs to the early pre-alarm system. The difference from the traditional automatic fire alarm system is that the early alarm of the electrical fire monitoring system is to avoid losses, while the traditional automatic fire alarm system is to reduce losses. In order to prevent electrical fires, reduce fire hazards, design electrical fire monitoring systems reasonably, ensure the construction quality and performance of electrical fire monitoring systems, and protect personal and property safety, the "Code for Fire Protection Design of High-rise Civil Buildings" and the mandatory national standard "Residual Current The Installation and Operation of Action Protection Devices emphasizes the protective effect of residual current action protection devices in preventing electrical fires caused by ground faults, and requires the install...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a transformer sampling circuit to solve the problem of misjudgment of existing leakage transformers, thus losing the monitoring function of leakage current

Images