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DESCRIBE THREE (3) TYPE OF INSULATOR USED FOR OVERHEAD LINE

TYPES OF INSULATOR IN POWER II

DESCRIBE THREE (3) TYPE OF INSULATOR USED FOR OVERHEAD LINE [ 3 marks]

1 PIN TYPE INSULATOR: Are made in piece up to 25KV and above for up to 50KV only. You can add up the voltage by adding one more piece, they become uneconomical for higher voltage.

2. SUSPENSION TYPE INSULATOR: Are made in form of disc and a number of them used in a flexible string for the voltage range desires with the conductor being attached to the lower end for 400KV lines, 19 discs of overall length 3.84m are used.

3 STRAIN TYPE INSULATOR: Are obtained often a string of suspension insulator is used in a horizontal position. They are mainly used in line terminal and crossed end roads.

B) State with reason, which of the insulator in (Q4a) is suitable for high voltage (HV) lines

Answer
STRAIN TYPE INSULATOR

because they’re used for line terminals and transmission lines and for higher voltages >11kv and much higher

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