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Specific Lightning Protection Std Application Question

Specific Lightning Protection Std Application Question

Specific Lightning Protection Std Application Question

(OP)
IEEE 998-2012 provides technical guide on the design of direct lightning stroke shielding of substations. Is this standard only limited to outdoor-air insulated switchyards?

CAN/CSA-B72-M87 (Installation Code for Lightning Protection Systems) indicates that it "does not cover the protection of electrical transmission and distribution systems, and communication systems" (see section 1.1)

I have a small packaged, pre-fabricated, modularized type substation which has both building and transformer yard on skids. The transformer yard is protected by the shielding from the 72 kV transmission gantry feeding the transfomer primary, outdoor, SF6, power circuit breaker which is also mounted on the the same transformer yard skid.

a. The design of the lightning shielding on the 72kV gantry based on IEEE 998-2012 and should include the indoor substation as the transformer skid and substation building are just beside each other.

b. Now, if I have the indoor substation 200 meters away from the air-insulated outdoor switchyard and is adjacent to a larger process building. I intend to design the outdoor switchyard to IEEE 998-2012 and the building to CAN/CSA-B72-M87 (the larger building lightning protection may include the smaller adjacent substation building (include in the rolling sphere protection envelope of the larger building)

Does a and b make sense?

regards,

RE: Specific Lightning Protection Std Application Question

a) makes sense if you can place you building within the rolling sphere envelope, providin g the gantry has 2 lightning mast to calculate your shpere radius.

b) unless the larger building has a lightning rod on its roof then your building if adjacent to the larger building is just an extention of the building. You possible have to use a fixed angle range from 20-60 degree but the recommended angle is 30 degree off vertical from the height of the mast.

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