Title :
A possible mechanism for neutral grounding resistor failures
Author :
Labos, William ; Mannarino, Antonio ; Drobnjak, Goran ; Ihara, Satoru ; Skliutas, John
Author_Institution :
Public Service Electr. & Gas Co., Newark, NJ, USA
Abstract :
The authors have found a mechanism that may account for recent failures of neutral grounding resistors in 26 kV substations owned by Public Service Electric and Gas Company (PSE&G). A neutral grounding resistor can fail due to a local, high-frequency oscillation involving the inherent inductance of the resistor and the transformer phase-to-neutral coupling capacitance. High voltages within the neutral resistor structure can be developed by the cable ring-down transients initiated by a single-line-to-ground fault on a 26 kV feeder circuit. This failure mechanism has not been previously reported in literature.
Keywords :
earthing; electrical faults; power transformers; resistors; substation protection; 26 kV; Public Service Electric and Gas Company; cable ring-down transients; feeder circuit; high-frequency oscillation; neutral grounding resistor failures; single-line-to-ground fault; substations; transformer phase-to-neutral coupling capacitance; Assembly; Capacitance; Circuit faults; Failure analysis; Grounding; Impulse testing; Inductance; Resistors; Substations; Voltage;
Conference_Titel :
Power Engineering Society General Meeting, 2005. IEEE
Print_ISBN :
0-7803-9157-8
DOI :
10.1109/PES.2005.1489670
