Question

Time lag for breakdown is:

• A. Time required for gas to breakdown under pulse application
• B. Time taken for the voltage to rise before breakdown occurs
• C. Time difference between the instant of applied voltage and the occurrence of breakdown
• D. Time required for ionization

Hint:

The time lag for breakdown is the delay between voltage application and the actual breakdown, influenced by statistical and formative factors.

Answer 1

The Correct Option is C

Step 1: Definition of Time Lag for Breakdown The time lag for breakdown in gaseous insulation refers to the delay between the application of a voltage higher than the breakdown voltage and the actual occurrence of breakdown. 
Step 2: Breakdown Time Lag Components
The time lag consists of:
- Statistical time lag: Time required for the formation of a free electron to initiate breakdown.
- Formative time lag: Time taken for avalanche multiplication to result in complete breakdown.
Step 3: Evaluating options:
- (A) Incorrect: Breakdown occurs in gases under different conditions, not necessarily under pulse application.
- (B) Incorrect: Voltage rise is independent of the breakdown time lag.
- (C) Correct: Time lag is defined as the delay between applied voltage and breakdown occurrence.
- (D) Incorrect: Ionization is a part of the process but does not fully define the time lag.