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  1. ELECTRICALTESTING

    Voltage loss control to coil of motor contactor

    The problem under discussion can be solved by providing "re-acceleration" to the drives. The drives i.e. the motors can be divided into a) contactor operated b) breaker operated c) VFD operated For a) contactor operated motors, there are several ways of achieving like 1. by providing...
  2. ELECTRICALTESTING

    VFD Supply Sag

    In most of the VFDs there is a feature called "Power Loss ride through" which usually takes care of such input voltage dips for few seconds. In this case the drive will continue to maintain the previous speed. But one should take care of the control supply part of VFD which, if...
  3. ELECTRICALTESTING

    Substation Transformer Failures

    PLEASE CHECK WHETHER THE NEW BREAKER HAS ANY CONTACT BOUNCING PROBLEM IN ANY OF THE POLES. IN CASE OF CONTACT BOUNCING, THE SURGES ARISING OUT THERE OF MAY BE CAUSING INSULATION FAILURE OF THE TRAFOS
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