Current Limiting Reactor

[sonic02]

Hi there,

What are the standard formulaes used in desiging an outdoor 44kV current limiting reactor in a substation. Downstream of the reactor is a solidly grounded 44/26kV, 10MVA distribution transformer. Happy if someone could refer me to a section of a book, IEEE or CSA standard?

The purpose of the reactor is to reduce the fault level in the substation.

Thanks.

Sonic

 

[dpc]

I'd assume the supplier will design it. You need to determine how much reactance you need and if that is going to be realistic. Once you know the reactance, talk with the suppliers. The supplier can also advise on the expected size/weight/cost and resistance losses to be expected.

If you have a transformer directly downstream, it might be more cost effective to just build more impedance into the transformer. This won't help you on the 44 kV side obviously.

CLRs are a really good thing to avoid if you can. Just one more thing to fail and generate losses.

 

[scottf]

You'll need to tell the vendor the rated voltage, continuous current rating, the impedance needed, and what the short-time current rating will be (with the reactor installed). If it is a retrofit, you'll need to tell them about any special installation limitations, normally pertaining to magnetic clearance distances to open and closed metallic loops.