Poor Connections - Thermal Imaging Survey Examples

Poor Connection at a Large UK Manufacturing Company

As part of an ongoing CBM Condition Based Monitoring Project, WYKO where called in to carry out a thermographic survey at a large UK manufacturer. As part of the survey the Engineer found that an infeed motor was running hot, through the guarding. This was later diagnosed to be the forced cooling fan not operating due to the contactor not being pulled in by the PLC. This was rectified saving the motor from complete failure.

Connection Faults

Motor Inspected from behind guarding.

Connection Faults Thermal Image

Thermal Image showing motor temperature at 47.1°C
A More serious issue was highlighted at the Substation Transformer. The Thermographic Survey showed that there was a Hot-Spot on the front of the transformer enclosure. The Transformer feeds a large section of the Mill Plant. On inspection of the transformer, a serious connection fault had occured, at the interface between the output transformer & LV boardcopper bus-bars.

Connection Faults

Photo of the Cabinet pointint out the heat spot.

Connection Faults Thermal Image

Thermal Image showing cabinet temperature 43.6°C
The plant had now got to run at a reduced load for 24 hours. Materials where fabricated and installed on the Friday morning, by mid day the transformer was put back into operation and the Mill could now run at full capacity. This has highlighted to the customer that Thermography is a valid CBM requirement for their plant and equipment.

Connection Faults

Damger between Transformer
and LV boardcopper bus-bars.

Connection Faults Repaired

Repaired unit in place.