I. System overview

The device is mainly used for dry transformer load side voltage and current monitoring, bus and transformer joint temperature monitoring, winding temperature monitoring, 4 channels passive switching input and 2 channels switching alarm output. Monitor the main machine cycle display three-phase voltage and current, transformer winding temperature and transformer joint temperature data. When the transformer winding temperature exceeds the alarm set value, the fan switch output node is closed and the fan is started to cool the transformer. When the tripping temperature exceeds the set value, the tripping switch output node is closed and the alarm indicator light is on. The monitoring host has the function of data uploading, and the communication interface adopts RS-485 mode. Supports ModbusRTU communication protocol.

2. Topology

Three, technical parameters

The power AC220V

Temperature accuracy ±1℃

Voltage accuracy reading 0.5%

0.5% of current accuracy reading