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E192144 Pages:2

PART ^

Answer any twofull questions, each carries10 marks.

(a) A 12-stage impulse generator has 0.126 uF capacitors. The wave front and
the wave tail resistances connected are 800 ohms and 5000 ohms respectively.
If the load capacitor is 1000 pF, find the front and tail times of the impulse of
the impulse wave produced.

Explain the Chubb-Fortescue method of measurement of peak a.c. voltages.
Explain the peak voltage measurement using sphere gaps.
Sketch and analyse the basic circuit of an impulse current generator.

PART D
Answer any two full questions, each carries 10 marks.

Discuss the method of locating partial discharges in electrical equipment
using (a)Straight detection method (b) Balanced detection method

What are the different tests done on insulators? Describe.

Explain, with a schematic diagram, one method of measuring Radio
Interference Voltage of transmission line.

Explain the method of impulse testing of high voltage transformers.

मर मर RK

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