Dear Sir,In one of my sites in United Arab Emirates.(Al Dhafra) we have noticed the failure of a varistor(non leniar resisor) which was installed in the field circuit of thegenerators to protect against surge voltages.No details are available on the damaged item.However details of the wholeexcitation system are as follows. Manufacturer: GL (GARBE LAHMEYRER&CO. GERMANY. BEA Type no. DDE 850/65-32 f160 Order no. 1102825031 I can indicate the technical requirements as follows. The item consists of material having voltage dependent resistanceproperties.Up to certain voltages the current drawn will benegligible.Beyond that it takes heavy current there by preventing thecircuits from over voltages.It is available in various sizes and shapesdepending upon ratings.Our requirement is with voltage ratings above 500 Vand size approx.50 mm dia and 75 mm length. The operating voltage range ofthe excitation system there is 175-350 V.If any more clarifications are required please inform.Awaiting your price and delivery of the same.RegardsA.S.Soares.Trident marketing & Trading.(USA)EMail : tridentmktg@adelphia.netPhone 001-714-9990310.
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