West Asia Trading & Engineering Pte Ltd

Importers, Exporters, Engineering Works, Manufacturers Representative & Commission Agent

No. 1 Kim Keat Lane Singapore 328858 Tel: +(65) 6250 5676 Fax: +(65) 6252 9890

E-mail: westasia@singnet.com.sg




P & B Buchholz Relays



* Buchholz Relays

* Dry Air Pump



Buchholz Relays

P&B has been a leading manufacturer of Transformer protection relays of the Buchholz principle for over 60 years. Most faults in an oil filled Transformer are accompanied by the generation of gas. By using a suitable relay the formation of this gas can be used as a warning of a developing fault.



Products have been designed, tested and manufactured to meet the detailed requirements of British Standard BEBS T2, Eskom and DIN specifications.

P&B were also privileged to be represented on the technical committee responsible for preparation of the harmonised European specification EN 50 216, which relays also comply to.



A vast range of standard products is available, whilst we are happy to provide units to your specific requirements e.g. fixings, flanges, conduit entry, calibration, finish etc.














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Dry Air Pump

The Dry Air Pump provides a portable solution for on-site testing of Gas and Oil operated Buchholz relays.

A charge of air is created in the polycarbonate cylinder by means of a foot operated pump. The cylinder contains an indicating silica gel, which absorbs the moisture present in the air. The pressure of the air charge is monitored on the built-in pressure gauge. When a suitable pressure has been attained the air charge is then quickly passed to the Buchholz via a flexible tube, by opening the ballvalve fitted to the cylinder. To prevent backpressure forcing oil back the flexible pipe a non-return valve is incorporated in the unit.

The indicating silica gel is a crystalline material, which absorbs moisture readily. The properties of the crystals can easily be regenerated by heating/drying. The crystals are impregnated with iron compounds, which gives them an orange colour. Upon absorption of moisture these crystals change from their orange colour to a pale yellow and then become colourless. When the crystals change to pale yellow they should be regenerated.






         Max. operating pressure 60 psig

         Self contained in a rugged steel case with carrying handle

         Supplied with 7m long hose and fittings

         Size: 475 x 250 x 128mm




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West Asia Trading & Engineering Pte Ltd

No. 1 Kim Keat Lane

Singapore 328858

Tel: +(65) 6250 5676

Fax: +(65) 6252 9890

E-mail: westasia@singnet.com.sg