Transformer DC Bias Online Monitoring System SWDC

1、 System Overview
The transformer neutral point DC bias online monitoring system adopts an advanced layered distributed structure, applies bus control technology and modular design principles, greatly improves the anti-interference performance, measurement accuracy and stability of the system, meets the practical requirements of industrial sites, and uses a unique expert diagnostic system to scientifically analyze and diagnose the collected data, making it easy to timely and conveniently understand and grasp the health status of the substation equipment.
By real-time online monitoring of the AC and DC currents at the neutral point of the transformer, analyzing and fitting the monitored data, and combining it with the on-site working conditions, hidden dangers in the transformer can be detected in a timely manner to avoid accidents.

2、 System composition
The transformer DC bias monitoring system consists of a monitoring device, a current sensor, a vibration monitoring unit (optional), a noise monitoring unit (optional), and backend software;

Three technical characteristics
Real time online monitoring of AC and DC neutral points in transformers;
Adopting high-precision through type transformers, the amplification factor is automatically selected based on the measured current to achieve high-precision measurement
Adopting dynamic phasor compensation algorithm to achieve high-precision measurement signal analysis
Adopting a distributed measurement structure, namely on-site measurement and digital transmission
Can be installed with power on, which means there is no need for the main equipment to be powered off for installation, making it convenient and fast to access the system
The shell is made of 304 stainless steel material with a protection level of IP65.

4、 Technical indicators
Working voltage: AC 220V ± 15%, 50Hz
Power consumption:<5W at rated voltage
Environmental temperature: -40 ℃~+70 ℃
Working environment humidity: ≤ 95%
Measurement values: DC (average) current, AC effective value
Measurement current range: AC/DC current, 0~200A
Measurement accuracy: 1%
Resolution: 0.05%
Supports multiple protocols such as Modbus, IEC60870-104, IEC61850, etc;