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  1. Derm

    Fuse Characteristics

    Hi folks, This has probably come up before in one way or another but anyway....what do the letters describing fuse types mean? e.g. gL gG gR gH and aM ? I'm looking to specify a fuse on the secondary side of a VT for high accuracy metering purposes. The meter is 0.2% and VT cores are CL0.2s...
  2. Derm

    Transformer overheating protection

    Hi! We're reviewing specs for new power transformers and I've forgotten the basic theory behind temperature monitoring on transformers. For large power transformers the tank thermometer is temperature compensated by a ring CT on one of the LV bushings. ? What is the exact reason for doing this...
  3. Derm

    Silicone v Porcelain Insulators

    Hi! Interested to hear of anybody’s experience with silicone insulators. Traditionally our substations have used porcelain insulators (for historic reasons). Recent breakage’s of porcelain has highlighted the fragile nature of the material and the possibility of a serious failure occurring is...

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