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TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

b. After being in service tests. These tests are only necessary in determining the operating condition of a power capacitor after exposure to possible damage or other trouble indications. The dielectric strength may be measured by applying the same voltage as given for the before service test. The capacitance can be determined by applying a known voltage and frequency of a good wave shape. Short-circuited or open-circuited capacitors will be indicated by this test. Tests for terminal resistance and liquid tightness may also be desirable, as covered in later paragraphs.

c. Capacitor bank automatic switching. Switched capacitor banks should be inspected for proper operation every year. The maintenance schedule given in table 13-2 is based on the indicated types of on-off controls. For oil switches, open and close operations between maintenance periods should not exceed 2,500.

Table 13-2. Capacitor bank oil switch maintenance1

Maintenance

schedule, Type of control years

Time clock.................. 3

Voltage...................... 3

Dual temperature............ 5

Temperature only............ 8

Time clock and temperature .. 8

13-13. Terminal tests of power capacitors.

Terminal tests may be those measuring resistance, as recommended by ANSI/IEEE 18, or may be handbook-recommended insulation or voltage tests.

a. AN SI/IEEE 18 resistance tests.

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