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  • Users: william879
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  1. william879

    Primary protection of instrument PT

    Hi All, working on a 25kV GIS gear. the Primary of the instrument PT on the voltage bus does not have Over-current protection. Is that typically acceptable? To add primary fuses, we need to add another section to the GIS since the PT is plug in type and I can't attach a fuse to the PT body...
  2. william879

    DC circuit breaker selection question for PV application

    Hi All, Here is a question coming from Ontario Canada. I am trying to size the DC breaker and conductors for a Solar application. The short circuit of the PV source circuit is calculated at 200A dc, 600Vdc the ampere rating of the PV source circuit is 200Ax125%=250A dc the continuous load...
  3. william879

    Direct Buried DC cable ampacity calculation for solar farm

    I am designing the cable trench for 24 direct buried cables (12 circuits) for a solar farm project. Each cable carries 168A dc current, continuously. Both "+" and "-" carry the same amount of current, which is obvious for DC. Question 1: How am I suppose to size the cables with optimum...

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