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Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

(OP)
This symbol is on a xfmr vendor print. The gauge measures the temperature of the windings.

RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

Windings are connected in parallel for the low voltage of a dual voltage transformer??

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

(OP)
It's not a dual voltage transformer. And this symbol is not on the nameplate of the xfmr. It's a temp gauge on the transformer, and this device is part of it. It's wired out to terminals. RTD?

RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

"Looks like" an RTD and a second RTD for the gauge?

Best to you,

Goober Dave

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RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

(OP)
http://iamechatronics.com/notes/general-engineerin...

We were expecting an RTD that has three wires to monitor the winding temperature. That's what the PLC is set up to accept. There is a conflict between the PLC dwgs and the xfmr drawings. The PLC drawings show an I1+, I1-, and a ZP connection. I look through this article and see the 3-wire RTD shown..not exactly what we've got but close.

RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

A WTI doesn't usually measure the winding temperature directly. They typically measure the oil temperature using a capillary bulb and use a CT hanging on one of the phases to drive a bias heater so that the winding temperature can be inferred from the oil temperature. The second element may be a trimming resistor for calibration.


RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

Possibly a pot driven by the temperature gauge movement?

RE: Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means?

Glad to help. smile

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