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Maintenance
Table 3:
Rated maximum- | Rated power- |
| |
voltage | frequency withstand |
|
|
kV (rms) | kV (rms) | kV (rms) | kV dc |
|
|
|
|
38.0 | 80 | 60 | 85 |
*Megger is a registered trademark of Megger Group, Ltd.
Vacuum-integrity test procedure
1.Observe safety precautions listed in the DANGER and WARNING advisories. Construct the proper barrier and warning light system.
2.Ground the frame of the circuit breaker, and ground each pole not under test.
3.Apply test voltage across each pole for one minute (circuit breaker OPEN).
4.If the pole sustains the test voltage for that period, its vacuum integrity has been verified.
Note: This test includes not only the vacuum interrupter, but also the other insulation components in parallel with the vacuum interrupter. These include the standoff insulators and the insulated drive- links, as well as the insulating (tension) struts between the upper and lower
As-found insulation and contact- resistance tests
Insulation and contact-resistance test equipment
In addition to the
AC
Test equipment for
Insulation and contact-resistance test procedure
1.Observe safety precaution listed in the DANGER and WARNING advisories for the
2.Close the circuit breaker. Ground the frame of the circuit breaker, and ground each pole not under test. Use manual charging, closing and tripping procedures.
3.Apply the proper ac or dc high- potential test voltage as shown in Table 3 between a primary conductor of the pole and ground for one minute.
4.If no disruptive discharge occurs, the insulation system is satisfactory.
5.After test, ground both ends and the center metal section of each vacuum interrupter to dissipate any static charge.
6.Disconnect the leads to the spring- charging motor.
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