Purpose of surge arrester
Surge arresters are primarily used to discharge lightning strikes and switching surges to ground – protecting equipment in the process.
Note that arresters are not applied to relieve the system from temporary over-voltages. For instance, when a phase-to-ground fault occurs on one phase, the voltage on the healthy phases shoot-up by a factor of \sqrt{3}. A surge arrester is sized to withstand these (i.e. not overheat).
The size and location of surge arresters ar
Cost of surge arrester
- 12kV 10.2kV MCOV porcelain station class arrester: ~$300 /phase
- 35kV 29kV MCOV porcelain station class arrester: ~$500 /phase
- 69kV 57kV MCOV porcelain station class arrester: ~$600 /phase
- 138kV 108kV MCOV porcelain station class arrester: ~$2,000 /phase
- 230kV 180kV MCOV porcelain station class arrester: ~$3,500 /phase
- 345kV 264kV MCOV porcelain station class arrester: ~$6,500 /phase
- 500kV 318kV MCOV porcelain station class arrester: ~$17,000 /phase
- 765kV 467kV MCOV porcelain station class arrester: ~$28,000 /phase
Note: The cost includes the price of structural steel for 138kV and above arresters.
Lead time to procure surge arrester
~20 weeks for high voltage units. Extra high voltage may have longer lead times.
Information on cost and lead time is for your general knowledge only. Contact vendor with your equipment specifications for actual figures.
