Surge Arrester Sizing 1

[enggines]

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.

 

[busbar]

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.

 

[cuky2000]

Double click in the enclose threads. There are several infor that could help

thread238-46596
thread238-48892
thread238-47828
thread242-39720
thread238-33645
thread238-26559
thread242-19894
thread238-16587