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Surveillance en ligne

La surveillance permanente des transformateurs dans le réseau est une technologie éprouvée pour prévenir les pannes imprévues ou les dommages. Les activités de décharges partielles de niveaux suspects sont des indicateurs d'une panne à venir ou d'une défaillance du système. Les instruments de surveillance de Power Diagnostix offrent des alarmes et des messages de pré-alerte pour éviter de telles pannes.

Surveillance de décharge partielle sur les transformateurs

Partial discharge monitoring has become increasingly important in the past few years. Besides other parameters like gas in oil analysis, temperatures, vibrations, or load conditions, etc., the PD trending information completes a full set of monitoring data of a transformer in the field. A series of standard bushing adapter (BA) is available to connect the measurement system to the test tap of a transformer bushing. For condition based maintenance, a portable instrument like the ICMsystem can be used onsite for temporary measurements. For continuous monitoring, an instrument such as the ICMmonitor can be considered. Acoustic sensors in combination with one of the mentioned PD instruments can be used to locate a PD fault more precisely.

Schéma de raccordement pour les systèmes de surveillance de décharge partielle

Beside of the preferred HF PD decoupling from the capacitive test taps of the transformer bushings (BA & BCU2C), it can be an option to take the UHF signal in addition or instead. Suitable UHF PD sensors are available from Power Diagnostix for the oil drain valve (TVS2) or for flanges of inspection holes (TFS1). The advantage of less influence of external noise signals stands in contrast to the lower detection sensitivity of PD activity generated from failures from within the winding. However, a combination of both techniques can be considered as a good compromise.

BCU2
TVS2
TFS1