A Transformer Sampling Circuit

Abstract

The invention discloses a transformer sampling circuit, which includes a sampling resistor arranged on the output terminal of the secondary side of the transformer, and an open circuit judgment detection circuit composed of at least one voltage dividing resistor and a switch tube. The sampling resistor , the voltage dividing resistor and the switch tube form a series branch. The transformer sampling circuit of the present invention aims at the disadvantages of the connection between the existing electrical fire monitoring detector and the leakage transformer, and adds an online testing circuit to the transformer. The sampling resistor, the voltage dividing resistor and the switching tube form a series branch, and when the current is When 0, the series branch is turned on, and it is judged whether the transformer is open or faulty by detecting the voltage value of the sampling resistor. The circuit structure is easy to control, so that debuggers and users can intuitively understand the status of the line between the leakage transformer and the connection detector, and can accurately display the connection and disconnection of the leakage transformer, which greatly facilitates on-site debugging and monitoring. Master the transformer status during operation.

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...

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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

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