Indonesia Hydropower Transformer Oil Temperature Monitoring

Transformer and Operating Environment

Oil temperature monitoring for an oil-immersed transformer at an Indonesian hydropower application must account for high humidity, outdoor exposure and the control-room signal path.

The project environment may combine high humidity, outdoor exposure and limited access to the transformer during operation. Instrument location, enclosure sealing, cable entries, capillary protection and safe maintenance clearance should be included in the installation review.

Temperature Monitoring Needs

The top-oil indicator provides a local value and can operate cooling or alarm contacts. The project specifies the thermometer pocket, temperature range, number of contacts, contact assignments and any remote signal required by the control room.

Temperature trends need the correct context. Operators should review top-oil value with load, ambient condition and cooling status rather than interpret one isolated reading as a direct winding hot-spot measurement.

Suitable OTI and WTI Arrangement

A BWY2 oil temperature indicator can be reviewed for local indication and selected remote output. A BWY-D804AITH configuration may be considered where additional contacts or a powered remote arrangement is required. Final availability follows the current model documents.

Bulb diameter, active length, thread, insertion depth and capillary length must match the transformer arrangement. Spare capillary is managed in a broad protected route without crushing or sharp bends.

Cooling, Alarm and Remote Signals

Cooling and alarm contacts are tested through their final relays and annunciation paths. Set points follow approved transformer thermal limits and are recorded with the contact function.

A Pt100 or 4-20 mA path requires compatible scale and wiring at the receiving equipment. Commissioning compares local indication with the control-room value and verifies alarm mapping.

Installation and Commissioning Checklist