Siemens 3AH Інструкції, монтаж, експлуатація, технічне обслуговування - Сторінка 22

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Maintenance

Figure 16. 3AH Pole Assembly / Vacuum Check Mechanical / Contact Resistance Test

Note: Do not use DC high potential testers

incorporating half-wave rectification. These devices

produce high peak voltages.

These high voltages will produce X-ray radiation.

These devices also show erroneous readings of leak-

age current when testing vacuum circuit breakers.

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 each pole not under test.

3. Apply test voltage across each pole for one minute.

(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 interrupter. These include the standoff insulators and

the insulated drive links, as well as the insulating (tension)

struts between the upper and lower vacuum interrupter

supports. If these insulation components are contaminated

or defective, the test voltage will not be sustained. If so,

clean or replace the affected components, and retest.

As-Found tests verify the integrity of the breaker insula-

tion system. Megger or insulation resistance tests con-

ducted on equipment prior to installation provide a basis

of future comparison to detect changes in the protection

afforded by the insulation system. A permanent record of

periodic As-Found tests enables the maintenance organi-

zation to determine when corrective actions are required

by watching for significant deterioration in insulation re-

sistance, or increases in contact resistance.

In addition to the High Potential Test Equipment capable

of test voltages as listed in Table 4, the following equip-

ment is also required:

• AC High Potential tester with test voltage of 1500 volts,

60 Hz

• Test equipment for contact resistance tests.