How to respond to a Buchholz relay alarm on an ABB Pad-Mount transformer
A Buchholz relay alarm means gas is accumulating inside the transformer, which signals an internal fault. Do not reset and ignore. De-energize the transformer and perform a dissolved gas analysis before returning to service.
How to respond to a bushing flashover on an ABB Pad-Mount transformer
A bushing flashover is a high-voltage fault. De-energize immediately, do not approach the transformer until it is confirmed dead, and replace the damaged bushing before returning to service.
How to interpret and respond to high DGA readings on an ABB Pad-Mount transformer
High dissolved gas analysis readings indicate an incipient fault inside the transformer. Follow the DGA interpretation standard (IEEE C57.104 or IEC 60599), escalate to your transformer engineer, and plan de-energization if key fault gases are above action levels.
How to diagnose high oil temperature on an ABB Pad-Mount transformer
High oil temperature means the transformer is overloaded or the cooling system has failed. Check the load current against nameplate kVA, inspect the radiator and fans, and reduce load if oil temperature is above 95 degrees Celsius.
How to diagnose loud humming from an ABB Pad-Mount transformer core
A louder-than-normal hum from a transformer is often DC offset from harmonics or loose core laminations. Measure the supply voltage distortion and check whether neighboring equipment is injecting DC or harmonics onto the line.
How to locate and fix oil leaks on an ABB Pad-Mount transformer
Oil leaks are most commonly from degraded flange gaskets or radiator welds. Identify the leak source, de-energize the transformer, and replace the gasket or have the weld repaired by a qualified transformer service shop.