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Which of the following testing methods is NOT used to test an AC energy meter?
Long period dial test
Starting test
Creep test
Braking test
Braking test
The braking test is not a standard performance verification test for AC energy meters. Standard testing procedures for single-phase induction-type energy meters primarily involve the creep test, starting test, and dial (or load) test to ensure accuracy and operational integrity.
IS 13779:1999
The braking test is not a standard performance verification test for AC energy meters. Standard testing procedures for single-phase induction-type energy meters primarily involve the creep test, starting test, and dial (or load) test to ensure accuracy and operational integrity.
Percentage┬аError=True┬аenergyEnergy┬аmeasuredтИТTrue┬аenergyтАЛ├Ч100%
Meter┬аConstant(K)=kWhRevolutionsтАЛ
In an induction energy meter, the creep test checks if the disc rotates with voltage applied but no load current. The starting test verifies the disc's ability to rotate at a minimum load current (typically 0.5% of rated current). The long period dial test verifies the integration accuracy over a fixed duration compared to a standard reference meter.
Creep test ensures the disc does not rotate continuously at 110% of the reference voltage when load current is zero.
Starting test ensures the meter starts registering at a minimum specified load, usually 0.5% or 1% of rated current.
Braking is an internal mechanism of the meter, not a test method for calibration.
The dial test evaluates the total energy recorded over a significant time interval under steady load.
Ensures consumer billing accuracy.
Prevents revenue leakage due to meter drift.
Verifies meter sensitivity at low loads.
Calibration laboratories for electrical meters.
Utility testing centers for new energy meters.
Post-installation field audit of electricity meters.
The braking magnet provides a retarding torque proportional to the disc speed, essential for operation, but 'Braking Test' is not a recognized testing standard.
Option A is a standard test for accuracy over a long integration time.
Option B checks the low-current starting capability.
Option C checks for unwanted disc rotation without load.
D is correct тАФ Braking test is an internal functional mechanism of the induction disc rather than a prescribed testing procedure for energy meters.
Always remember that tests for energy meters are defined by their ability to measure energy integration; if a term refers to a physical component (like the braking magnet), it is likely the 'odd one out' in testing procedure questions.
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