Recent content by kashali

Reply to PRC: Yes, RPRR and Sudden pressure rise relay are same. Sorry, I mean RPRR & Pressure relief device(PRD). In my experience, we have 25 Conservator type transformers with Buchholz's Relay and 08 Hermetically sealed transformers with RPRR. These, transformers are in continuous service...

Qualitrol RPRR Model 910 cannot be calibrated in field. Only you can perform "GO - NO GO Test" using Qualitrol Field Test Kit K-0013. Yes, our transformers are hermetically sealed type with nitrogen gas. And equipped with RPRR and Sudden Pressure Rise Relays. At the time of tripping no...

On Qualitrol Seal-in Relay (Model: 909-200-01), One contact (63X1) is used for alarm circuit and other contact (63X2) for the trip circuit. Although , I have noticed that both contacts of Seal-in Relay energized simultaneously on actuation of RPRR.

What are the possible causes of false actuation of RPRR (Rapid Pressure Rise Relay)? Can anybody answer.

The RPRR relay (Qualitrol Model 910)was tested in January, 2014 and then after tripping in September 2014 using Qualitrol Test Kit-013 and found OK.

We have 08 ABB hermetically sealed transformers installed in 1996. Transformers T1 & T2 are of 8000 KVA and the remaining T3 to T8 transformers are of 1200 KVA rating.  These transformers remain in continuous service since installation and we regularly perform inspection & testing of these...