RR Series Buchholz relay (former ETI)
UNEL 21006 Standard Buchholz relay for oil-immersed power transformers
Buchholz relays detect faults and minimize the propagation of any damage which might occur within oil-filled transformers. Short circuit faults such as inter-turn faults, incipient winding faults and core faults may occur due to overheating, bad connections and ageing. The Buchholz relay senses such faults and closes the alarm circuit. Its function is 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.
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Flow vane disengaged from the lower float: separate contacts (up to 6)
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Independent switches for the upper and lower float and flow vane
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Mechanical test button to test independently the three sets of switches, also remoted to man level
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Pneumatic plug to directly test the flow vane
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Inlet diameter: 25 mm/50 mm/80 mm/100 mm
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Connection executions: flanged or threaded
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Oil flow rate: from 1 m/s up to 2 m/s (other rates upon request)
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Waterproof - IP 65 protection degree (up to IP 67 enhanced degree of protection upon request)
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