PMSet U Series Circuit Breaker

The PMSet U Series three phase circuit breaker can be used as the switchgear component for an ACR using the PowerLogic ADVC Controller. It can also function as a load break switch when used as the switchgear component for an AS.

The PMSet U Series circuit breaker is operated by a magnetic actuator which produces a positive opening and closing action. Switching occurs when a controlled pulse is sent through the open/close actuator from a storage capacitor in the PowerLogic ADVC Controller. When closed, the switch is latched magnetically. Spring loaded push rods provide contact loading on the interrupters.

A Current Transformer (CT) and a Capacitive Voltage Transformer (CVT) are moulded into the CT-housing. These are monitored by the PowerLogic ADVC Controller for protection, remote monitoring and display.

One or two auxiliary voltage supplies (either 115 or 230 VAC) can be used to power the PowerLogic ADVC Controller which in turn supplies a DC line voltage to the SCEM in the switchgear. Another auxiliary supply option is to use an external (integral) voltage transformer with a 27.8 VAC secondary connected directly to terminals on the SCEM card adjacent to the plug where the control cable from the PowerLogic ADVC Controller is connected.

The ACR or AS with PMSet U Series switchgear is supplied with copper stems or optional cable clamp connectors. Mounting brackets for lightning arresters are optionally available.

The switchgear contact position is shown by a large, clearly visible external pointer.

A hook-stick can be used to engage the manual trip ring to trip and mechanically lockout the switchgear from the ground. The mechanical trip ring has two positions. In the up position normal operation can take place. In the down position the switchgear is tripped and both mechanically and electronically locked open. So if the switchgear is tripped by pulling the trip ring down, the trip ring must be pushed back up before the switchgear can be closed.

The PowerLogic ADVC interfaces to the switchgear via the control cable and connects to the Switchgear Cable Entry Module (SCEM) in the base of the tank. The SCEM uses non-volatile memory to store all relevant switchgear data such as calibration values, ratings and number of operations. The SCEM also provides electronic shorting of the CT’s and CVT’s in the event the control cable is disconnected while current is flowing through the switchgear.