Title :
On-line partial discharge detection system for instrument transformers
Author :
Moreau, Christophe ; Charpentier, X.
Author_Institution :
Direction des Etudes et Recherches, Electr. de France, Moret/Loing, France
Abstract :
A new system based on signal processing methods has been developed and applied to internal partial discharge detection in instrument power transformers. The advantage of this system is its suitability for onsite measurements without disturbing the operation of the power network. First, digital acquisition of a complete 50 Hz signal of high frequency currents taken from the earth connections of a three-phase set of instrument power transformers takes place. Secondly, the signal is analysed by various algorithms allowing the recognition of internal discharges. The system permits onsite detection of partial discharges inside the paper/oil insulation of instrument power transformers from a few hundred of pC. This new method appears very attractive and could be supplemented in further stages with partial discharge pattern recognition or applied to other HV electrical equipment
Keywords :
automatic testing; electric breakdown; instrument transformers; insulation testing; paper; partial discharges; power system measurement; power transformer insulation; power transformer testing; signal processing; transformer oil; algorithms; digital acquisition; discharge pattern recognition; high frequency currents; insulation breakdown tests; internal partial discharge; online partial discharge detection; onsite measurements; paper/oil insulation; power system instrument transformers; signal analysis; signal processing methods; test automation; three-phase transformers; Algorithm design and analysis; Earth; Frequency; Instruments; Partial discharge measurement; Partial discharges; Power measurement; Power transformers; Signal analysis; Signal processing;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549284
