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Surge Arrester Sizing

Surge Arrester Sizing

Surge Arrester Sizing

(OP)
Hello!

What would be the proper or better protection for a substation and distribution system from surges?

Our practice is to use; 72KV and 15KV arresters on the substation high side and low side respectively. Line distribution is protected with 12kv arresters.

A project engineer on a new substation commends that we shall use 60KV rms with 48KV MCOV on the high side. The low side shall be 12KV & 10.2KV MCOV and 10KV, 8.4KV MCOV for line protection.

The project is a 33MVA, 69/13.8 KV, DYn1, 3-phase, 60Hz substation.

The utility is connected at load-end of a 69KV sub-transmission line. Distribution system is UNIGROUNDED.

Thanks in advance.

RE: Surge Arrester Sizing


There may be applicable material in

IEEE C62.22 …Application of Metal-Oxide Surge Arresters…, and
IEEE C62.92.4  …Neutral Grounding in Electrical Utility Systems, Part IV—Distribution.
  

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