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Which type of material is used for lighting arrester?
Copper
Aluminium
Copper clad steel
All of above
All of above
A lightning arrester (surge arrester) requires high electrical conductivity to divert transient overvoltage surges to the ground and high mechanical strength to withstand weather conditions. Copper, aluminium, and copper-clad steel all offer excellent conductivity and corrosion resistance, making them suitable materials for the discharge path and associated electrodes.
A lightning arrester (surge arrester) requires high electrical conductivity to divert transient overvoltage surges to the ground and high mechanical strength to withstand weather conditions. Copper, aluminium, and copper-clad steel all offer excellent conductivity and corrosion resistance, making them suitable materials for the discharge path and associated electrodes.
VsurgeтАЛ=I├ЧZarresterтАЛ тАФ The relation between surge voltage, discharge current, and arrester impedance.
ZlowтАЛтЙкZloadтАЛ тАФ The fundamental operating condition requiring low impedance for effective diversion.
The lightning arrester acts as a voltage-dependent resistor. Under normal operating conditions, it behaves as an insulator. When a high-voltage surge (like a lightning strike) occurs, the resistance drops significantly, providing a low-impedance path to the ground, thereby protecting the downstream equipment from dielectric breakdown.
Materials must possess high thermal stability to withstand the intense heat generated by surge currents.
Copper-clad steel is often preferred for mechanical ruggedness combined with high surface conductivity.
The grounding electrode system associated with the arrester must have low earth resistance, typically <1╬й for critical equipment.
High conductivity ensures rapid dissipation of surges
Corrosion resistance ensures long operational life in outdoor environments
Cost of high-grade copper can be prohibitive for very large installations
Thermal expansion mismatch in composite materials can lead to mechanical stress
Transmission line protection
Substation transformer insulation protection
Distribution system surge suppression
Lightning arresters are connected in parallel with the equipment they protect.
The choice of material often depends on the specific site's environmental conditions (e.g., coastal areas require higher corrosion resistance).
D is correct тАФ Copper, aluminium, and copper-clad steel are all industry-standard materials due to their high conductivity, mechanical strength, and favorable corrosion characteristics.
Always remember that an effective lightning arrester is only as good as its ground connection; regardless of the material used, if the grounding resistance is high, the device will fail to protect the equipment.