I am an electrical engineer moving from Australia (hot) to Canada (cold) in the near future and was wondering if there are any good reference materials for designing electrical installations (high voltage and low voltage) for sub-zero temperatures.
I wanted to read about the differences between...
IEC60909 uses an equivalent impedance assuming a frequency of 20Hz for the calculation of the R/X ratio to determine peak currents in a meshed network (cl 4.3.1.2).
Does anyone know why 20Hz is used?
Has anyone reviewed the various computer programs for calculating touch and step potentials in substations?
I see IEEE std 80 refers to a few but I can not find any details.
Thanks
With a 3-phase Delta(HV)-Star(LV) transformer with the Star point connected to earth, what fault current would flow in the HV side for a line-to-earth fault on the LV side?
Would overcurrent or earth fault relays on the HV side detect the fault?
Why, with LV cables are you required to provide both overload and short circuit protection yet with HV cable only short circuit protection is required?
Why not set the overcurrent protection to provide overload as well?
