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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 circuit breaker?
Operating mechanism
Conservator
Fixed contact
Moving contact
Conservator
Quick Summary: A circuit breaker is a mechanical switching device capable of making, carrying, and breaking currents under normal and abnormal circuit conditions. The conservator is a component specifically used in oil-filled transformers to allow for the expansion and contraction of transformer insulating oil.
A circuit breaker is a mechanical switching device capable of making, carrying, and breaking currents under normal and abnormal circuit conditions. The conservator is a component specifically used in oil-filled transformers to allow for the expansion and contraction of transformer insulating oil.
Iarc=∫0ti(t)dt — represents the integral of arc current over the contact separation time
Vrestrike=Vm(1−cos(ωnt)) — represents the transient recovery voltage across contacts
The circuit breaker functions through an operating mechanism that actuates moving contacts to separate from fixed contacts during a fault, creating an arc that is subsequently extinguished by a medium (air, oil, SF6, or vacuum). The conservator, conversely, is an auxiliary tank situated above the main transformer tank, connected via a Buchholz relay, to maintain oil level and prevent oil oxidation.
Circuit breakers include operating mechanisms, fixed/moving contacts, and arc quenching chambers.
Conservators are dedicated to liquid-immersed transformers to manage oil volume variations due to thermal expansion.
The Buchholz relay is the protection device located between the conservator and the transformer tank.
Automatic protection against short circuits
Manual or remote control of electrical circuits
Requires periodic mechanical maintenance
Arcing can cause contact erosion over time
High voltage substations
Domestic distribution panels
Industrial motor protection
A conservator is not a functional part of a circuit breaker; including it in a breaker system would serve no technical purpose.
Common circuit breaker parts include: Bushings, Interrupter chamber, Operating rod, and Arc chutes.
B is correct — The conservator is an auxiliary tank component used exclusively in oil-filled transformers, not in circuit breakers.
In competitive exams, always distinguish between components of the Primary Equipment (Breaker) and the Transformer peripherals, as examiners often swap these to test conceptual clarity.