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Maintenance
Figure 45: Contact-resistance test of the primary contacts
Continuous | Contact |
current | resistance |
rating (A) | |
1,200 | 35 |
|
|
2,000 | 30 |
|
|
3,000 | 30 |
|
|
Table 4: Maximum contact resistance
7.Connect all points of the secondary disconnect with a shorting wire. Connect the shorting wire to the high- potential lead of the
8.If no disruptive discharge occurs, the
9.Disconnect the shorting wire and re- attach the leads to the
10.Perform
Inspection and cleaning of circuit- breaker insulation
1.Perform the spring discharge check on the circuit breaker after all control power is removed. The spring discharge check consists of:
A.Depressing the red trip pushbutton
B.Depressing the black close pushbutton, and
C.Depressing again the red trip pushbutton.
All of these controls are on the circuit breaker front panel. Visually verify the DISCHARGE condition of the springs.
2.Remove phase barriers as shown in Figure 7: Circuit breaker primary disconnects on page 13.
3.Clean barriers and post insulators using a clean cloth dipped in isopropyl alcohol.
4.Replace all barriers. Check all visible fasteners again for condition and tightness.
Note: Do not use any cleaning compounds containing chlorinated hydrocarbons such as trichlorethylene, perchlorethylene or carbon tetrachloride. These compounds will damage the phenylene ether copolymer material used in the barriers and other insulation on the circuit breaker.
Functional tests
Refer to the "Installation checks and functional tests" section of this instruction manual on pages 8 to 13. Functional tests consist of performing at least three manual
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