EB series (ex BR/DR series)

EB SERIES
The most popular Buchholz relay for oil-immersed power transformers

KEY FEATURES

• Waterproof (IP65 protection degree)
• Large inspection window
• Suitable for replacing similar existing and old models (of any brand)

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 PRODUCT DESCRIPTION

A Buchholz relay is a type of oil- and gas-actuated protection relay universally used on all oil-immersed transformers with a rating greater than 500 kVA – conservator type. Buchholz relays are used to protect transformers from faults occurring inside the transformer.
Short circuit faults such as inter-turn faults, incipient winding faults and core faults may occur due to overheating, bad connections and ageing. A Buchholz relay will sense such faults and close the alarm circuit. The Buchholz relay functions based on the fact that an electrical fault inside the transformer tank is accompanied by the generation of gas; if the fault is severe enough, it will be accompanied by an oil surge from the tank to the conservator.
The EB series Buchholz relay is waterproof and features an IP65 protection degree, enabling its usage even in very rainy and wet environments.
The EB series is even equipped with a large graduated window, allowing clear and easy inspection from the outside.
The EB series Buchholz relay has been designed in order to enable the replacement of both similar old (DIN 42566) and new models (EN50216/2).
The EB series is also suitable for use with a RG3.3 gas collecting device that allows gases to be drained from the relay accumulation chamber operating at eye level.

Relay type	Inlet diameter	Connection design	Flange execution	Bolt circle execution	Standard reference	Catalogue
EB024	25 mm	Threaded 1 1/2" G	//	//	EN 50216
EB 25		Flanged	Round with 4 holes	PN10
EB050	5 mm
EB 79	80 mm
EB 80			Round with 8 holes
BQ80			Square with 4 holes
Gas collecting device (suitable for EB 50 and EB 79/EB 80)
RG3.2 model
Others
Wiring diagram
EB series - assembly sketch
Gas analyzer for Buchholz Relay