Visual Inspection of the Capacitor Bank Conditions Examine the external surfaces & make sure the capacitors & reactors are clean & dry. Check that the primary connections are correct. Check the earthing connections between the capacitor bank mounting frames & enclosure.
Design tests and type tests are typically expensive or damaging. The type tests performed on the capacitor bank are: High Voltage Impulse Withstand Test. Bushing Test. Thermal Stability Test. Radio Influence Voltage (RIV) test. Voltage Decay Tests. Short Circuit Discharge Test.
An ANSI or IEEE standard is used for testing a capacitor banks. Tests on capacitor banks are conducted in three different ways. These are When a company introduces a new design of power capacitor, the new batch of capacitors must be tested to see if they meet the standards.
The finish of film capacitors is assessed in compliance with EPCOS finish specifications. For more detailed specification, refer to the "General technical information" chapter. When applicable, the individual data sheets are definitive for finishing. The failure rate is defined as the failure percentage divided by a specified operating period.
This test is only applicable when the internal capacitor elements of a unit are separated from its housing. This ensures that the insulation provided between the capacitor parts and the metal enclosure can tolerate overvoltage. The test voltage is applied across the casing and the bushing stand for ten seconds.
Check that the primary connections are correct. Check the earthing connections between the capacitor bank mounting frames & enclosure. Insulation resistance tests, as listed below, will be conducted for one minute each. Safety CTs/VTs connected to the bank star point should be removed during these tests.