Siemens 38-3AH3 38 kV instruction manual Continuous Contact, Rating a, Functional tests

Figure 45: Contact-resistance test of the primary contacts

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 high-voltage tester and ground the circuit-breaker housing. Starting with zero volts, gradually increase the test voltage to 1,500 volts rms, 60 Hz. Maintain test voltage for one minute.

8.If no disruptive discharge occurs, the secondary-control insulation level is satisfactory.

9.Disconnect the shorting wire and re- attach the leads to the spring-charging motor.

10.Perform contact-resistance tests of the primary contacts (refer to Figure 45: Contact-resistance test of the primary contacts). Contact resistance should not exceed the values listed in Table 4: Maximum contact resistance.

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 spring-charging checks and three automatic spring-charging checks. After these tests are complete, and the springs fully discharged, all fasteners and connections are checked again for tightness and condition before re-installing the circuit breaker into the metal-clad switchgear.