Note: Secondary-disconnect terminals are numbered 1-16, from right to left.
The automatic spring-charging features of the circuit breaker must be checked. Control power is required for automatic spring-charging to take place.
1.Open control-power circuit by opening the control-power disconnect device.
2.Install the circuit-breaker end of the split-plug jumper (if furnished) to the circuit breaker as shown in Figure 5: Split-plug jumper connected to circuit breaker. The split-plug jumper is secured over the circuit-breaker secondary contacts with thumb screws.
3.Install the switchgear end of the split- plug jumper to the secondary- disconnect block inside the switchgear cubicle as shown in Figure 6: Split-plug jumper connected to switchgear. The jumper slides into place and interconnects all control power and signal leads (for example, electrical trip and close contacts) between the switchgear and the circuit breaker.
4.Energize (close) the control-power circuit disconnect.
5.Use the close and trip controls (refer to Figure 1: Type 38-3AH3 vacuum circuit breaker front panel controls on page 8) to first close and then open the circuit-breaker contacts. Verify the contact positions visually by observing the OPEN/CLOSED indicator on the circuit breaker.
6.De-energize control power by repeating Step 1. Disconnect the split- plug jumper from the switchgear before disconnecting the circuit- breaker end.
7.Perform the spring discharge check again. Verify the closing springs are DISCHARGED and the primary contacts of the type 38-3AH3 vacuum circuit breaker are OPEN.
Final mechanical inspections without control power
1.Make a final mechanical inspection of the circuit breaker. Verify the contacts are in the OPEN position, and the closing springs are DISCHARGED.
2.Check the upper- and lower-primary studs and contact fingers shown in Figure 7: Circuit breaker primary disconnect. Verify mechanical condition of finger springs and the disconnect studs, check for loose hardware, damaged or missing primary-disconnect contact fingers and damaged disconnect studs.
3.Coat movable primary-contact fingers (refer to Figure 7: Circuit breaker primary disconnect) and the secondary-disconnect contacts (refer to Figure 23: Construction of secondary shunt release (shown charged) on page 30) with a light film of Siemens contact lubricant number 15-172-791-233.
4.The type 38-3AH3 vacuum circuit breaker is ready for installation into its assigned cubicle of the metal-clad switchgear. Refer to removal procedures and install the circuit breaker into the switchgear.
5.Refer to the switchgear instruction manual for functional tests of an installed circuit breaker.
