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Substation Lightning Protection

Substation Lightning Protection

Substation Lightning Protection

(OP)
When performing a lightning shielding study for a transmission substation do you consider the power transformer winding BIL or bushing BIL in your study?

RE: Substation Lightning Protection

Is this an either/or or a yes/no question? Normally, the winding BIL and bushing BIL are the same. Yes, they need to be considered. If different, use the lower BIL.

RE: Substation Lightning Protection

(OP)
A lot of times the bushing BIL will be higher (in contaminated areas) so I wasn't sure if the winding BIL when lower would need to be considered. If there is a strike and a voltage wave is propogated down the bus to the transformer it will reflect back due to the impedance of the transformer. I wasn't sure if that wave would make it into the windings and as such the winding BIL would need to be considered.

Sounds like it does?

RE: Substation Lightning Protection

No.
BIL is associated with travelling waves.
shielding is associated with lighning strokes.

RE: Substation Lightning Protection

Shielding is dependent on BIL because higher BIL equipment can withstand a higher current surge. A higher current surge is associated with a longer strike distance. A longer strike distance can be shielded with less shieldeing.

RE: Substation Lightning Protection

jghrist,
higher BIL equipment can withstand a higher voltage surge . A very high surge current crossing an equipment, with nanosec of duration, is not a problem!

RE: Substation Lightning Protection

Voltage surge = stroke current times surge impedance.
See page 37 of 7anoter4's link.

RE: Substation Lightning Protection

Let's go back!

Question:
When performing a lightning shielding study for a transmission substation do you consider the power transformer winding BIL or bushing BIL in your study?

Answer:
No.
equipments BIL is associated with travelling waves.
shielding studies are associated with lighning strokes and busbar BIL.
In EHV substation if a lightning strikes the transformer it will explode!
In EHV substation if a lightning strikes the bus, a CT, PT or arrester will explode!
Shielding wires or masts are devices to deflect lightning strikes on substation equipments.

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