Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 7 replies
  • Subscribers 9 subscribers
  • Views 171 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Unelec ACB details

Manish Makwana
Hello,


I'm designing for an upgrade of some very old electrical distribution boxes. These are fed by 1000A Unelec ACBs. I'd like to find out if these have been set to a different trip current, as they are connected to PILC cables of perhaps 185-240mm2. It looks as if these cables can't handle anywhere near 1000A.


From the engraved plate on the side of the breaker, the two types of breakers in use are:

- DVAS UR 7 IN

- PVRT UR 7 IN.


Nothing appears on google for these. Much of the field equipment dates back to the 1960s and 70s, so I'm assuming the breakers are from that era too.


Does anyone know anything about these kinds of breakers, or would know who to talk to? I have emailed Unelec as well, but given their website has not been updated since 2007 I'm not sure what to expect.


Thanks
Parents
  • 0
    Hi Manish,


    Unelec is pretty much the ACB from the past. I worked in a power station in Singapore, which was built in 1997, and we had similar ACBs. And they are quite a nightmare. 


    I suggest you to do a secondary injection test and ensure that the trip coils are still in order. If not, might as well upgrade ACBs together. There is a big possibility that contacts/ coils may not be functioning properly after years of being inactive.


    Thanks and regards

    Weeser
Reply
  • 0
    Hi Manish,


    Unelec is pretty much the ACB from the past. I worked in a power station in Singapore, which was built in 1997, and we had similar ACBs. And they are quite a nightmare. 


    I suggest you to do a secondary injection test and ensure that the trip coils are still in order. If not, might as well upgrade ACBs together. There is a big possibility that contacts/ coils may not be functioning properly after years of being inactive.


    Thanks and regards

    Weeser
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines