Distribution Class Lightning Arrester Brand Siemens System Voltage 22 kV Country of Origin India Arrester Type Valve

The objective of arrester application is to select the lowest rating surge arrester that will have a satisfactory services life on the power system while providing adequate protection of equipment insulation. An arrester of the minimum practical rating is generally preferred because it provides the highest margin of protection for the insulation. The use of higher rating increases the capability of the arrester to survive on the power system but reduces the margin of protection it provides for a specific insulation level. Thus arrester selection must strike a balance between arrester survival and equipment protection.
Stresses to which the arrester will be exposed:1] Continuous system voltage2] temporary over voltages.3] Lightning surges.
Continuous system voltage is the recommended limit to the magnitude of the permissible r.m.s. power frequency voltage. Which may be continuously applied between the arrester terminals. Temporary over voltage can be caused by a number of system events such as line-to-ground faults, circuits back feeding, load rejection and ferro resonance. Arrester temporary over voltage(TOV) capability must meet or exceed expected TOV stresses. Arrester selected must have sufficient capability to meet the anticipated service requirement in all categories.