In the UK, 11-kV power lines are part of the distributionsystem, not the transmission system. The system is split as follows:
to reduce the cable size, the higher the volts the smaller the cable.look at car battery cables,in mains cable rating,240v the same size would supply a flat.
Can we use sterling va42 varnish in 11 kv motor
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kv stands for kilovoltage
It isn't. In the UK, transmission and distribution voltages are 400 kV, 275 kV, 132 kV, 66 kV, 33kV, and 11 kV.
The electricity supply system is divided into the transmission system and the distributionsystem. The distribution system is the part of the system which supplies the consumer -in the UK, we are talking about voltages of 33 kV, 11 kV, and 400/230 V.
11 kv
It used to be a convention to add 10% to allow for transmission losses, so the voltages were always described as 11 kV, 33 kV, 66 kV and 132 kV. Later standards in the UK grid are 275 kV, which is a multiple of 11, and 400 kV which is not.
Multiples of 11 kV are used in many countries. The idea is to deliver a round number of volts so you add on 10% to allow for line losses. So 10 kV becomes 11 kV. In practice lines are operated without a 10% voltage drop now because it represents an unacceptable waste of energy, but we have stuck with 11 kV etc. Common supply voltages used for area distribution are 6.6 kV, 11 kV, 33 kV, 66 kV and 132 kV.
it means the rms value of 11 kv that vacuum C.B. can withstand it during 1 minute
Star (or 'wye') connected alternators have a phase voltage of 6.35 kV, and a line voltage of 11 kV. Incidentally, it's 'kV', not 'KV'.
Short Circuit
It isn't necessarily the case. In the UK electricity distribution system, you have 33/11-kV step-down tranformers (where 11 kV is the secondary side) or 11-kV/400-230-V step-up transformers (where 11 kV is the primary side).
33 kV (not 'kv'!) is the standard primary-distribution voltage used in the UK's electricity supply system. Low voltage (400/230 V -not 440 V) is normally provided by transformers supplied from the 11-kV system, not the 33-kV system.
The higher-voltage line will have longer insulators and the line conductors will be further apart. And the symbol for kilovolt is 'kV', not 'kv'.