Transformer DC bias on-line monitoring system
IN-204 DC Bias Online Monitoring System for Transformers
System Introduction
IN-204 transformer DC bias online monitoring system can accurately detect and record the DC magnetic field strength of the transformer core, timely detect and warn of overheating, vibration and noise problems caused by DC bias to ensure the safe and stable operation of the transformer. The system is equipped with remote data transmission and intelligent diagnosis function, supports cloud management, provides comprehensive and real-time equipment status information for operation and maintenance personnel, and effectively improves the reliability and maintenance efficiency of the power system. The system consists of high-precision sensors, data acquisition unit, communication module, intelligent analysis terminal and cloud management platform, which realizes comprehensive monitoring and intelligent management of transformer DC bias condition.
| Product Selection | DC Polarization Monitoring | Vibration monitoring | Load monitoring |
| Standard Features | ✔ | ||
| Optional Features | ✔ | ✔ |
Equipment parameters
| DC current measurement range | -100A ~ 100A | Measurement accuracy | ±2A |
| DC current frequency range | ≤1kHz | linearity error | ≤0.5% |
| Vibration Displacement Measurement Range | 0 ~ 200μm | vibration sensitivity | 20mv/mm/s ±5% |
| Vibration frequency response range | 5 ~ 1000Hz | Noise measurement range | 20dB ~ 140dB |
| Operating power | AC220V ±10% | communication protocols | Modbus, DL/T860 |
| environmental adaptation | Ambient temperature: -40℃ ~ +70℃; Ambient humidity: 0 ~ 95% (no condensation) | protection class | Standard 19" rack mount (IP30), wall mount (IP55) |
By virtue of its high-precision monitoring, multi-scenario adaptation and stable operation characteristics, the transformer DC bias online monitoring system is widely used in the core scenarios of the power system to accurately solve the DC bias hidden dangers of transformers in different scenarios:
1. Substations at all voltage levels
Whether it is 110kV, 220kV urban distribution substation, or 500kV, 1000kV UHV hub substation, transformer as the core equipment of power transmission is susceptible to the influence of DC components in the grid (such as HVDC transmission system phase change, metro traction return current, etc.) to produce partial magnetization. The system can be directly deployed in the substation main transformer, contact transformer and other key equipment, through real-time monitoring of neutral point DC, core magnetism, timely warning of overheating of the iron core, noise increase caused by paramagnetism, to avoid equipment failures resulting in regional blackouts, to protect the city power supply and the stability of inter-regional power transmission.
2. Thermal/hydroelectric power plants
The main transformer in a power plant bears the key task of boosting the output voltage of the generator to the grid level, and under long-term high load operation, if the loss rises due to DC demagnetization, it will not only increase the cost of power generation, but also may cause equipment failure and affect the efficiency of power generation. The system is adapted to the high temperature and high electromagnetic interference environment of the power plant (-40℃~+70℃ stable operation, strong anti-interference ability), and can capture the dynamics of transformer demagnetization in real time. Combined with the optional load monitoring function, it can help operation and maintenance personnel to balance the load of the unit with the safety of the equipment, reduce the waste of energy due to the demagnetization, and ensure the continuous and reliable operation of the power generation system.
3. New energy plants (wind/photovoltaic)
New energy stations are mostly located in remote areas, where transformers are exposed to complex natural environments for a long time, and the DC component of the power grid is susceptible to fluctuations triggering partial magnetization due to the volatility of new energy power generation. The system supports wall-mounted (IP55), rack-mounted (IP30) and other installation modes, which can be adapted to different installation scenarios such as outdoor stations and control rooms, and monitors the transformer status 24 hours a day, with the data remotely transmitted to the operation and maintenance center, solving the problems of difficult manual inspection and untimely response at the stations, warning the risk of demagnetization in advance, guaranteeing the efficient grid connection of wind and photovoltaic power, and avoiding the influence of new energy consumption due to equipment failure. New Energy Consumption.
4. Captive power stations for industrial enterprises
Metallurgical, chemical, manufacturing and other industrial enterprises have their own power stations, and their transformers need to match the fluctuations in production loads. If the core overheats and the vibration noise increases due to DC paramagnetization, the stability of power supply to the production equipment may be affected, which may cause the production line to stop working. The system can be equipped with an optional vibration monitoring function to simultaneously capture the abnormalities of polarization and equipment vibration. Combined with Modbus and DL/T860 communication protocols, the system can be connected to the internal power monitoring system of the enterprise to realize the linkage with production scheduling, which helps the enterprise to check the hidden dangers of polarization in advance, and reduces the cost of equipment maintenance and the risk of interruption of production.
