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  • Users: matwong
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  1. matwong

    Single phase tripping

    In a delta-wye 33/11kV system, what will be the imbalance current detected by the 11kV substation relay in the event one of the downstream protective device operated on single-pole tripping ? Say the load current is 60A, is the relay seeing 40A (i.e.{60+60}/3) when one phase is out, and 20A...
  2. matwong

    EHV tower base - lighting

    Is there any product in the market that can produce lighting at the tower base which is using the induced emf or capacitive type energy from the energized EHV lines? I was thinking why we can't utilize the free power from EHV lines (not direct tapping) to light up tower base and install some...
  3. matwong

    Power Coaxial Cable

    Dear All, Does anyone of you come across the application of LV coaxial cable in power distribution network ? The idea is to prevent energy losses due to tampering cases. How feasible & practical is this idea ? Which cable manufacturer has produced this kind of cable & use in which utility ...
  4. matwong

    ELCB too sensitive

    This is one of the common question I always encountered but without any firm answer. There is always a particular house among a row of link-houses which ELCB operates whenever there is thunderstorm weather (whereas the rest of the houses are intact). All the houses having the same rating of...
  5. matwong

    MV RMU using Time lag Fuse conforming to ESI 12.6 standard

    Dear all, Any idea how well is the MV RMU (especially 11kV) using LV TLF performing in the industrial/utility company worldwide ? Our company has recently attempted to use this type of RMUs but somehow we have difficulties in sourcing for the fuse-link. It appears that only GE can produce this...
  6. matwong

    Magnetic actuated vs. spring charged VCB

    Any idea why magnetic actuated VCB isn't gain its popularity in MV switchgear as compare with the conventional type of spring charged motor driven VCB ? We have been told that it has been in the market for quite some years and has all sort of advantages over the other, in terms of less...

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