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  1. fb599

    Coosor 431M timne domain reflectometer

    Has anyone got a circuit diagram (or copy) of the mains engineers friend, the Cossor Model 431M unit. Any help welcomed. Google drew a blank :-( Thanks fb599
  2. fb599

    Current Carrying Capacity 0.0225" & 0.04" 11kV Cable

    I'm trying to establish the current carrying capacity of the following old UK imperial cable sizes laid in ground c. 1940/50: 0.0225" and 0.04" 11kV three core copper conductors (7strand/phase) paper insulated, lead covered and steel wire armoured. I have the values for steel belted but...
  3. fb599

    "Reyrolle" and "Ferguson & Pailin" Switchgear

    I've been doing some work at an electricity utility in the UK that has some very old British Reyrolle TT12X2 switchgear and Ferguson & Pailin BV3 OCB Switchgear. If anyone can help with user manuals or operational manuals in .pdf that would be great. The Reyrolle kit has some small aluminium HV...
  4. fb599

    Transformer CER Rating BS171

    I have a 11/33kV 12/24MW CER Network transformer which I wish to set up back up over current protection. What I would like is the failure characteristics or maximum overload ratings for the transformer. Not just 1.2x FLC but I need to squeeze a couple of these in case one trips for about 10...
  5. fb599

    Restricted Earth Fault Protection

    I have experienced two 33/11kV mal operations due to REF in the last two weeks due to external through faults. I'm checking the stability resistor settings and high impedance voltage settings. I saw a post for a spreadsheet that could make life easier, does anyone have a copy of this please ?
  6. fb599

    ABB Terminals REF545 Version 3.0

    Does anyone have any experience of these please ? I operate version 2.0 and am being asked to upgrade due to memory buffer overload problems on this version. Has anyone had any serious issues with version 3.0 please. Thanks
  7. fb599

    Negative Numbers and Brackets

    Can anyone tell me how to format a number to have brackets automatically in an Excel spreadsheet when the numbers are negative values please. This is a financial application however ! Thanks
  8. fb599

    Substation Earthing Requirements

    Does anyone know of any suitable software for calclating the earthing mat design of substations of 11-33 kV/415V design in a public power supply system ?
  9. fb599

    ABB REF 545 Back Up Protection Relay

    Has anyone had a failure of this type of relay that could have possibly issued an "open" command to a circuit breaker without receiving such an instruction ? Any help welcomed.
  10. fb599

    Protection System Management

    I'm trying to establish a suitable workable database for all of our network and genetor protection equipment (including settings, ser. No's, type of relays etc) and am at a loss. Do I start designing a new Access db. or an SQL db. ? I do not want to re-invent the wheel. I have access to Amtech...
  11. fb599

    XLPE Cable Cleating Spacing Distances

    Can anyone direct me to a table of spacing distances for cleating of XLPE cables. I think I've looked everywhere ! Yes, I know what size cleats to use but I don't know what the typical cleat spacings should be for differing sizes and weights. Any URL's or guidance welcome. PS Enjoy the weekend...
  12. fb599

    I have a 185mm Al 11kV pair of cabl

    I have a 185mm Al 11kV pair of cables rated at around 330A each. Both are feeding an area with max loading 140A. However, two 3.3MVA 11kV capacitors (175A each)have been added to this dist. area and are used from time to time. What will the cable max rating be if this new load is so capacitivly...
  13. fb599

    Transformer Dissolved Gas Problem ??

    I have a 60MVA Transformer which has had a DGA carried out as I am switching it out for routine checks in a months time. The analysis looks normal apart from one result. The Ethane content, instead of being around 10 ppm is 42ppm. Should I be worried so early into the life of this 1 year old...
  14. fb599

    BS 7671 Wiring Regs - Swimming Pools (UK)

    Dear All I would like to install some light fittings in zone B of a swimming pool installation. They are however, IPX3. In Reg. 602-05-01 Degree of protection of enclosures, zone B enclosures should be IPX4 minumum. But am I right in thinking that as long as my luminaires (not enclosures) are...
  15. fb599

    Island Utility HV Capacitor Reactive Compensation

    We have an island utility system of nominal load of 45MW. We are also connected via a 100km 90 kV AC cable link. During the summer months we do not run any generation, therefore we are hanging on this long length of cable. We use shunt/series reactors so that we balance out the capacitive...

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