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Q: How many sections are there with in part 7 of bs767 2008 amendment 3?
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Continue Learning about Electrical Engineering

How are substations protected?

Almost all of the equipment inside of a substation is used for the purpose of protection. The circuit breakers and power transformers in the substation are equipped with current transformers (CTs) that step down the current passing through the equipment to a level that can be read by protective relays. These protective relays can cause the breakers to trip upon many different events including under/overvoltage, current spikes, frequency issues, transformer/bus differential, etc. The breakers in a substation are placed strategically so that different pieces of equipment or sections of a circuit can be isolated without loss of service to the customer.


What is mean by auto re-closer in high voltage breaker?

Many high-voltage overhead line faults are temporary in nature -e.g. a branch hitting a line conductor during a storm. An 'autorecloser' mechanism is designed to automatically reclose a circuit breaker after it has tripped. If the fault has cleared itself, then the circuit breaker will remain closed; if not, the autorecloser mechanism can be set to reclose the circuit breaker several times (typically 3) before, finally, locking the circuit breaker open. Autoreclosers are often used in conjuction with 'sectionalisers'; these are non-load breaking switches which will disconnect sections of line towards the end of a feeder, in the hope that any fault has existed beyond that point and will be cleared before the autorecloser recloses the circuit breaker.


How many amperes will the toaster draw if it has a resistance of 24 ohms?

It depends on how many volts it has.


500kva how many amps given capacity?

500 KVA how many amps? almost 650 Amps according to formula.


How many lights can you put on a dimmer?

As many as the watts or current the dimmer specs say it will control - less 10 percent