Transformer Protection Relays (Buchholz Principle) - EMB Gmbh
Transformer Protection Relays (Buchholz Principle) - EMB Gmbh
Transformer Protection Relays (Buchholz Principle) - EMB Gmbh
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14. Other protection devices<br />
Monitoring relay for tap changers ÜRF 25, ÜRF 25/10, ÜRF 25/10-26<br />
The monitoring relay for tap changers, also known as the protection relay for<br />
tap changers or oil flow relay, is a monitoring device for insulating liquid-filled<br />
tap changers with conservator. It protects the tap changer and the transformer<br />
from damage. The monitoring relay responds to excessive oil flow in the<br />
direction of the conservator and generates a signal disconnecting the tap<br />
changer and the transformer immediately from voltage supply.<br />
Pipe diameter DN: 25 mm (1“)<br />
Type of connection: threaded or flanged<br />
Oil flow indicator SG 25, SF 25, SF 25/10<br />
The oil flow indicator is a protective relay monitoring the circulating oil lubrication<br />
or circulating oil cooling of machines and equipment. It indicates faults<br />
in circulating oil systems or shuts down the machine or equipment, thus preventing<br />
damage. The flow indicator operates at a very low service pressure,<br />
so it can be installed in an oil return pipe where the oil flow is ensured by the<br />
sloping pipe.<br />
Pipe diameter DN: 25 mm (1“)<br />
Type of connection: threaded or flanged<br />
For further information, please ask for special reference material.<br />
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