Question 384Electricity & Electronics - Assistant Engineer

The correct answer is D) transform relatively high generator load current to low instrument input current for ammeters, wattmeters, and the power factor meter. Current transformers are used to step down the relatively high generator load current to a lower level that can be safely and accurately measured by electrical instruments like ammeters, wattmeters, and power factor meters. This allows the instruments to operate within their normal input current ranges, rather than being overloaded by the full generator load current. The lower current input is proportional to the actual generator load current, allowing the instruments to provide accurate readings. The other answer choices are incorrect because they do not accurately describe the purpose of current transformers in this type of electrical switchboard installation.