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Which one is not type test of circuit breaker?
Mechanical performance test
Short time current test
Duty test
Temperature rise test
Duty test
According to IS/IEC standards, circuit breaker tests are categorized into Type tests (Design tests), Routine tests, and Special tests. The 'Duty test' (also known as the breaking capacity or duty cycle test) is a specific type of performance test, but it is not classified under the standard 'Type Test' grouping which specifically assesses the design robustness against dielectric, mechanical, and thermal stresses.
According to IS/IEC standards, circuit breaker tests are categorized into Type tests (Design tests), Routine tests, and Special tests. The 'Duty test' (also known as the breaking capacity or duty cycle test) is a specific type of performance test, but it is not classified under the standard 'Type Test' grouping which specifically assesses the design robustness against dielectric, mechanical, and thermal stresses.
IstтАЛ=T1тАЛтИл0тАЛ┬░Ti2dtтАЛ тАФ Root Mean Square value for Short-time current withstand test
P=I2R тАФ Governing principle for Temperature Rise test
Type tests are performed on a representative sample of a design to ensure that the equipment meets its specifications under normal and abnormal conditions. These include temperature rise, dielectric, mechanical performance, and short-time withstand current tests. Duty tests, while critical for validation, are often categorized as performance verification rather than standard design-certification type tests.
Type tests are performed on new designs or prototypes to verify compliance with standards.
Temperature rise test verifies that the steady-state temperature does not exceed limits.
Mechanical performance tests check operations like closing, opening, and trip coordination.
Short-time current tests ensure the breaker can withstand electrodynamic forces during a fault.
Ensures long-term reliability under specified ratings
Provides safety certification for installation
Type tests are destructive and expensive
Time-consuming to perform full battery of tests
Power system utility substations
Industrial distribution switchgear
The Duty test evaluates the breaking capacity cycle (OтИТtтИТCOтИТtтА▓тИТCO); it is considered a performance/rating verification test.
Routine tests (like power-frequency voltage withstand) are performed on every production unit, unlike Type tests.
C is correct тАФ Duty test is generally classified as a performance test rather than a standard Type test as defined by IS/IEC design standards.
Always distinguish between 'Routine' tests (performed on every unit) and 'Type' tests (performed on one representative design sample) in exams like GATE or ESE.