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Here is the product introduction of the ABB MWD-07 surge arrester:
The ABB MWD-07 is a silicone-rubber-insulated, gapless metal - oxide surge arrester, belonging to the MWD series. It is designed to provide reliable protection for electrical equipment in AC power systems against over - voltage surges.
Rated Voltage: 8.8 kV, suitable for AC systems with a nominal voltage of around 7 kV2.
Continuous Operating Voltage: It can continuously operate at 7 kV, ensuring stable performance during normal operation2.
Nominal Discharge Current: The nominal discharge current is 10 kA, which allows it to effectively handle large - amplitude over - voltage surges caused by lightning or switching operations2.
Residual Voltage: When discharging, it can limit the residual voltage to a relatively low level to protect the connected electrical equipment. For example, the residual voltage at 8/20 μs wave shape may be around 20.3 kV2.
Response Time: The response time is short, which can quickly respond to over - voltage surges and limit the duration of over - voltages.
Excellent Non-linear Characteristics: Using metal - oxide (MO) resistors as the core component, it shows excellent non - linear volt - ampere characteristics. Under normal voltage, the resistance is very high, and the leakage current is only in the micro - ampere range. When an over - voltage occurs, the resistance decreases rapidly, allowing a large current to pass through and discharge the over - voltage energy.
Temperature Range: It can operate normally in the ambient temperature range from - 60℃ to + 40℃, adapting to various harsh natural environments.
Other Environmental Factors: It has good resistance to humidity, pollution, and mechanical vibrations, ensuring reliable operation in different field conditions.
The MWD-07 surge arrester is mainly used in 7 kV AC power systems to protect equipment such as transformers, switchgear, cables, and motors from over - voltages caused by lightning strikes, switching operations, and other factors. It is suitable for indoor installation only and plays an important role in ensuring the safety and stability of power distribution systems.
