Transformer Relay VT inputs
Transformer Relay VT inputs
(OP)
We have an application as described below:
3MVA transformer 13.8KV-4160V. CTs are located on the primary side of the transformer and VT signals come from the secondary side of the transformer (4160V SWGR). We need the program the relay with phase VT ratio. But not quite sure what ratio we should use: 13.8KV/120V or 4160V-120V?
Any inputs will be appreciated.
3MVA transformer 13.8KV-4160V. CTs are located on the primary side of the transformer and VT signals come from the secondary side of the transformer (4160V SWGR). We need the program the relay with phase VT ratio. But not quite sure what ratio we should use: 13.8KV/120V or 4160V-120V?
Any inputs will be appreciated.






RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
RE: Transformer Relay VT inputs
What is your aim with the relay, i.e. at what fault scenario should the relay pick up?
RE: Transformer Relay VT inputs
The purpose of the relay is to protect the primary of the transformer. The relay will pick up at Phase and ground overcurrent ( TOC and IOC).
RE: Transformer Relay VT inputs
vector group of transformer
thread238-125306: vector group of transformer
Bill
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RE: Transformer Relay VT inputs
Assuming of course you don't have any directional protection (pure over current IOC and TOC; these protection functions don't care about the voltage/angle)
But not quite sure what ratio we should use: 13.8KV/120V or 4160V-120V?
What are you measuring U, I, P, Q, pf...?
RE: Transformer Relay VT inputs