Transformer with integrated protection relay

Transformer with integrated protection relay

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Transformer with integrated protection relay 

The integrated protection relay can guard a transformer against excessive temperature and
pressure rises as well as against presence of excessive amount of gasses (including air) inside the
transformer. There are two protection relays in use: DGPT2 and DMCR. These relays are manufactured
by two different producers but their protection system is the same.

The protection relay is equipped with a pressure sensor, factory set for pressure limit of 200hPa.
This setting should not be changed as it represents the highest admissible pressure value, never to be
exceeded in normal operating conditions of a transformer.
The protection relay includes also two temperature relays intended for triggering at “ALARM” and
“TRIPPING” temperature thresholds. These thresholds are adjustable and it is recommended to set
them as described in chapter „Loading of the oil-immersed transformers”.
The relay is equipped also with an oil level sensor – this sensor is activated when a critical amount
of gas (or air) appears inside the relay. Each protection relay has a sampling valve on its top. Opening

this valve while the transformer’s temperature is above 20°C will result in an oil spill out of the
transformer. Opening this valve while the transformer’s temperature is below 20°C will result in air
suction into the transformer, which will also trigger a tripping signal due to presence of air. Due to these
factors it is forbidden to open, just as it is forbidden to de-hermetize the transformers in any other
manner. The sampling valve is protected with a warranty sticker, breaking of which causes an
immediate warranty loss.

Transformer with integrated protection relay  is company's latest research and development products。