Metering vs. measurement 1

[tszpun]

Hello experts,

We have a requirement in a client spwcification that 33KV GIS incomer has to have metering function. My question is : provided that the relay IED itself has measurement of voltage power etc..., Is there a need of separate metering panel?

 

[RRaghunath]

If the client spec is saying just metering function, the metering function in IED should be good enough.
If the client spec is talking of separate Tariff metering panel, that is a different issue altogether.
Check if the spec is elaborating on metering function or metering panel elsewhere.

 

[Sn00ze]

That's vague. If they are talking about the incomer, that assumes CT has to have metering accuracy. but if you are talking about relays then I agree with RRaghunath.

You need to confirm if they are talking about:
1) SCADA matering (IED function is enough)
2) Revenue metering (metering class/accuracy CT needed)
3) if yes to 2), confirm CT is revenue metering approved (region dependent).