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  1. rainfire

    HV cable radius

    Can anyone advise how to measure the radius of an installed HV cable. I want to ensure it complies to BS6622 of 12 Outside Diameter. Thanks
  2. rainfire

    partial discharge test dry type Tx

    When I say all routine tests have benn carried out, I refer to: Temp Rise Lightning impulse 24hr leakage Voltage withstand Over voltage withstand Winding resistance measurement Voltage ratio and vector measurement No load loss and current measurement Short circuit impedance measurement I am...
  3. rainfire

    partial discharge test dry type Tx

    Hello How important is it for a PD test to be carried out on a drytype transformer (11kv/400V)? Is it a nice to have or is it critical? All other routine tests have been carried out ok.
  4. rainfire

    MBCi and unit protection

    The second question is, in order to convert a balanced volatge unit protection scheme to a circulating current scheme, it is just a case of changing the relays and uncrossing the pilots?
  5. rainfire

    MBCi and unit protection

    Hello, I have an 11kV substation that utilises Unit and O/C protection and has 6 ring feeders. The unit protection used a mixture of Tranlsay H and SDP relays. the relays are being replaced throughout with MBCis. If there is a pilot fault, will the MBCis initiate a trip at both end of the...
  6. rainfire

    11kV air gaps

    Hello, Is there a standard distance for air gaps between pahses in 11kV cable boxes? Thanks
  7. rainfire

    bus zone protection basics

    hello, can someone please advise the basics of bus zone protection on 11kV 3ph AC switchgear? As far as I understand a CT on the bus riser (next to bus coupler) for an O/C relay is sufficient. is this correct?
  8. rainfire

    How to measure mag curves of CT's

    So for an 11Kv 3ph distribution ring, with all cables protected with translay SDP 101, I could: Open relevent circuit breaker at my end, open remote CB at other end of cable to create open circuit status (hence isolating the cable but it will be floating, and not earthed) Inject AC volts...
  9. rainfire

    How to measure mag curves of CT's

    Hi, can anyone please advise on how to measure Mag curnves on class X protection CT's. what is physically required. Do you require isolation of the cable or can it be done by secondary injection testing? Thanks
  10. rainfire

    Electricity basics

    Hi, I am just wondering, since electicity always tries to return to the souce via the path of least resistance, what happens to it once it has returned to the source? Is it just a case of all the electons loosing their charge? Sorry if its a stupid question?

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