Title :
On-site measurement and location of partial discharges in transformers without the need of special HV supply
Author_Institution :
East China Electr. Power Test & Res. Inst.
Abstract :
Partial discharge (PD) measurement and location tests, especially for large transformers, require a high-voltage (HV) supply that is free from PDs, making it difficult for such tests to be performed on site. The author presents test circuits for testing three-phase and single-phase transformer banks with an on-load tap changer (OLTC). In both cases, the test voltage supplies the excitation as well as the supporting voltages. The author also describes an ultrasonic method of locating PDs for transformers using switching surges
Keywords :
insulation testing; partial discharges; power transformers; transformer insulation; transformer testing; ultrasonic materials testing; insulation testing; large transformers; on-load tap changer; onsite measurement; partial discharge location tests; partial discharges; power transformers; single-phase transformer banks; switching surges; test circuits; three-phase banks; ultrasonic method; Circuit testing; Electric variables measurement; Insulation testing; Partial discharges; Performance evaluation; Phase measurement; Phase transformers; Power measurement; Power transformer insulation; Sun;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38475
