MOV stands for Metal Oxide Varistor. It is a type of surge arrester that is used to protect electrical systems and equipment from overvoltage transients. It consists of a metal oxide material that acts as a voltage-dependent resistor, which limits the voltage across the device.
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Voltage Rating: Ensure that the MOV line surge arrester you choose has a voltage rating that is equal to or greater than the system voltage.
Current Rating: Choose an MOV line surge arrester with a current rating that meets or exceeds the peak current that the system can generate.
Response Time: Select an MOV line surge arrester with a response time that meets the requirements of the application.
Operating Temperature Range: Ensure that the MOV line surge arrester you choose has an operating temperature range that meets the requirements of the application.
Environmental Conditions: Consider the environmental conditions in which the MOV line surge arrester will be operating, including the possibility of exposure to moisture, dust, or other contaminants, and select an MOV line surge arrester accordingly.
Installation: Consider the ease of installation when selecting an MOV line surge arrester. Select an arrester that requires minimal wiring, allows for easy mounting, and can be easily tested and maintained.
Line surge arresters are exposed directly to lightning-related stress on overhead transmission and distribution lines. For this reason, the MOV blocks must maintain stable protection characteristics after repeated surge events rather than only withstand a single impulse.
TGE supplies MOV blocks for line surge arrester applications in diameters from approximately 32 mm to 115 mm. The designs are developed with repetitive charge-transfer capability, residual-voltage stability and long-term ageing performance in mind. This helps line arrester manufacturers design products that can reduce lightning-caused flashovers and improve line reliability under demanding outdoor service conditions.
Testing and maintenance of MOV line surge arresters is essential in order to ensure they remain effective in protecting against power surges. Testing of the MOV line surge arrester should be done periodically to check for proper operation. This includes visual inspections of the arrester and its components like zinc oxide blocks, as well as testing with a surge testing device. Maintenance of the metal oxide varistor mov should include regular cleaning of the arrester to remove dirt and debris, as well as replacing any components that are worn or damaged. Additionally, the MOV line surge arrester should be checked periodically to ensure it is properly grounded and that the wiring is secure.
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