Electrical equipment fundamental Questions & Answers

Electrical equipment fundamental

1. Why indoor switchyard is provided in MAPS?

The salt contamination in the switchyard is avoided by providing indoor switchyard
in MAPS. Because the plant is just 300 metres away from the seashore and the
atmosphere is saline. This salt will get deposited on the insulators and on the
conductors used in the switchyard. Due to this deposition insulators may fail to
unnecessary trip the system and conductor used must be copper for better
performance instead of low cost aluminum. So to avoid unnecessary trip and to have
low cost of installation and spare parts of aluminium indoor switchyard is used.

2. What do ABCB and ACB mean?

ABCB – Air blast circuit breaker.
ACB – Air circuit breaker.

3. What do you mean by frequency?

The number of cycles per second is called the frequency.

4. State the voltage and current relation in star and delta connection.

In star connection line current is equal to the phase current and line voltage is √3
times that of phase voltage.
In delta connection line voltage is equal to the phase voltage and line current is √3
times that of phase current.

5. In DC motor what is the relation between speed and field flux?

Speed of a DC motor is inversely proportional to the field flux.

6. What is the difference between self-excited and separately excited DC generator?

Self-excited generator: In a self-excited generator the field winding is excited by an
external DC source like a battery etc.
Separately excited generator: In a separately excited generator the field poles have
some residual magnetism. When the armature is rotated a small emf is induced in it.
This is fed to the field winding and if the current direction is such that it adds the
residual magnetic flux to the field winding and the field strength is increased. The
more emf in the armature, which is again fed to the field winding and goes on till the
generator builds up voltage.

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