The low-set stage is a current with a definite time or inverse-time operation. The high-set stage has a definite time characteristic only without the inverse-time operation.
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To calculate the DG set current, you need the load current and the load voltage. To convert it into kilowatts it is divided by 1000.
you can, but you will not get accurate answer as voltmeter consumes some current. so, potentiometer is used instead to measure emf ---- the potentiometer must be set to the expected emf from the cell before you put the zero detector in circuit if its set too high it will charge the cell too low it will load the cell perhaps if you dont know the voltage of the cell before you measure it you should get a hi impedance voltmeter(electrometer) to set the potentiometer as close as you can manage before you connect the zero detector
A current transformer is used in high voltage circuits where it is not possible to measure current directly. A CT is a step up transformer with only one turn in primary. There will be as many cores based on the purposes like metering, protection etc. The secondary of a CT should never be kept open circuited bcoz very high flux will be developed in the secondary and hence it may be damaged.
In a Wye/star system the overloads look at the phase to neutral/ground current; not phase to phase current. Which is always calculated as root three or 1.73205.............etc. Therefore the overloads have to be set to the phase to neutral/ground current.
1. Cheap to make. 2. Little heat whilst working. 3. Low power consumption. 4. Can utilize very high frequenzies (50-100 Khz is not uncommon.) 5. Very energy-efficient when used to convert voltages or to dim light bulbs. 6. High power handling capability 7. Efficiency up to 90%