2. Transformer protection
2.1 Relais Buchholz
This mechanical relay is located in the oil line (figure 11 ) which connects the transformer tank to the oil receiver. It is sensitive to any gas or oil movement. If this movement is slight, it closes a Buchholz alarm contact. In addition, a tripping command is given by another contact which closes in the event of significant movement. This relay is the only device that can detect ignitions between transformer windings that produce a gas release. All transformers and chokes in oil are equipped with this type of relay.
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Transformer protection
Digital protection
Bibliography
Standards and norms
- Vocabulaire électrotechnique International. Chapitre 448. Protection des réseaux d'énergie - CEI 60050-448 - 12-95
- Relais électriques - CEI 60255 -
- Communication networks and system in substations - IEC 61850 - 12-09
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