Innovation in internal fault detection

Internal faults
Due to normal degradation of insulating properties in transformers, and especially during lightning or ice storms, transformers fail internally. Over the years manufacturers have improved their technology to protect against high current faults, however this makes detection of initial low current faults and restoration of service very difficult for line crews working under pressure and often in adverse conditions. When crews close on the undetected fault, eventful failures can occur. Line crews refer to the re-energizing operation as “push and pray.”

The Technology
CEATI International, in collaboration with IFD Corporation, the National Research Council (NRC), and power utilities, have developed a highly reliable and inexpensive sensor for detection of internal faults, even at low currents, which typically do not cause any visible damage to the transformer tank.

The sensor is integrated with the signaling device and incorporates an equivalent of the conventional pressure relief valve. When the internal fault occurs the IFD provides a signal ensuring ‘drive-by visibility.’

Value for everyone
The IFD allows the power utility to ensure much safer, faster, and less expensive restoration of service. Crews need not climb the pole to inspect and detect internal faults, and the IFD protects against escalating damage to the transformer and surrounding area, providing the only built-in safety device crews can use to protect themselves, their utility, and the public from the consequences of eventful failures.

T994700 5003: Development Of An Internal Fault Detector For Pole-Top Distribution Transformers

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