Can anyone tell me what this European symbol on a oil filled xfmr temp monitor means? 1

[bdn2004]

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

 

[waross]

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

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

 

[bdn2004]

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?

 

[DRWeig]

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

Best to you,

Goober Dave

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[bdn2004]

http://iamechatronics.com/notes/gen...ors-and-resistance-temperature-detectors-rtds

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.

 

[ScottyUK]

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.

 

[LionelHutz]

Possibly a pot driven by the temperature gauge movement?

 

[bdn2004]

http://www.qualitrolcorp.com/Produc..._Plate_Winding_temperature_simulation_system/

Just to close the loop on this thread...ScottyUK was exactly right on this. Thanks ScottyYUK!

 

[ScottyUK]

Glad to help.