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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which of the following is not a part of the circuit breaker?
Explosion pot
Fixed and moving contacts
Conservator
Operating mechanism
Conservator
A conservator is a cylindrical tank mounted on top of a power transformer, not a circuit breaker. It serves to accommodate the expansion and contraction of transformer insulating oil during temperature variations.
A conservator is a cylindrical tank mounted on top of a power transformer, not a circuit breaker. It serves to accommodate the expansion and contraction of transformer insulating oil during temperature variations.
Vt=31VL — Relation between phase and line voltage for Star connection
P=3VLILcosϕ — Power in a 3-phase system
The conservator provides space for oil volume changes, preventing the formation of vacuum or air pockets in the main transformer tank. In contrast, a circuit breaker utilizes an operating mechanism to open/close contacts and an explosion pot (arc chute) to extinguish the arc during fault interruption.
A circuit breaker is a switching device designed to open and close a circuit under normal and abnormal (fault) conditions.
The conservator tank is exclusive to oil-immersed transformers.
Explosion pots are used in bulk oil circuit breakers to confine and extinguish the arc.
Circuit breakers ensure safety by isolating faulted sections of the grid.
They provide automated protection against overcurrent and short circuits.
Requires regular maintenance of contact wear and insulating medium.
Mechanical failure of the operating mechanism can prevent tripping.
Transmission lines
Distribution substations
Industrial power control
The conservator is connected to the main tank via a Buchholz relay in many large transformer designs.
Operating mechanisms for circuit breakers can be pneumatic, hydraulic, or motor-spring charged.
C is correct — The conservator is an auxiliary component of an oil-filled transformer, whereas explosion pots, contacts, and operating mechanisms are integral parts of a circuit breaker.
Always distinguish between 'Transformer Accessories' (like conservator, breather, Buchholz relay) and 'Circuit Breaker Components' (like interrupters, contacts, mechanisms) as these are frequently confused in power system exams.