gas actuated relays for oil filled transformers en 50216-2 - maxsteel

14. Accessories14.1 Gas sampling device RG3.214.1.1 General featuresThe body is made of aluminium alloy casting; in order to check gas andoil two large inspection windows made in trogamid (on request made intempered glass and with sunshield), are fitted on either side of thecasting.Two petcock complete with hermeto joints are present for connection torelay and one pneumatic valve for test and another petcock draining oilcomplete the apparatus14.1.2 InstallationThe Buchholz gas sampling device "RG3" must be fitted on thetransformer tank, from the ground level, within handy height.A copper tube (size 8 mm OD/ 6 mm ID) must be used to connect the“RG3.2” device, from the cock "12", to the top of the Buchholz relay,cock "R"; for connecting the tube to the cocks, special unions "14" shallbe used. If using RG3.3 a second copper tube has to be used forconnecting cock “T” to cock “15”.When the RG3 apparatus has been mounted cocks “R” and “T” have toremain open positionFor filling the device with oil, open the cocks "R"; “T”; “15” and "12",open the cock "2" and wait until oil has entirely filled the «RG3» device,then close cock "2" and “15”; oil level inside «RG3» may be controlledthrough the inspection windows located on the two sides.In the normal operating conditions, the gas sampling device, theBuchholz relay and the connecting tube between them should be oilfilled.Nome file : RELE EN50216 REV 04 DTD 23/04/2007 Pagina 16 di 22UNCONTROLLED COPY