PMSet UR Series Circuit Breaker

The PMSet UR 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 UR Series switchgear is an evolution of the PMSet U Series switchgear, with higher current capacity and BIL, and is equipped with 6 internal CVTs for voltage measurement.

Figure 346
PMSet UR Series Circuit Breaker

The PMSet UR 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.

Three Current Transformers (CTs) (one per phase), and six Capacitive Voltage Transformers (CVTs) (one per bushing) are moulded into the pole. These are monitored by the PowerLogic ADVC Controller for protection, remote monitoring, and display.

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

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

A hook-stick can be used to engage the manual trip ring, allowing the switchgear to be tripped and mechanically locked out from the ground. The mechanical trip ring has two positions:

• Up position: Normal operation is enabled.

• Down position: The switchgear is tripped and locked open both mechanically and electronically.

If the switchgear is tripped by pulling the trip ring downward, the ring must be pushed back upward before the switchgear can be closed again.

The PowerLogic ADVC interfaces with the switchgear via a control cable, which connects to the SCEM located at the base of the tank. The SCEM uses non-volatile memory to store all relevant switchgear data, such as calibration values, ratings, and the number of operations. Additionally, the SCEM provides electronic shorting of the CTs and CVTs in the event that the control cable is disconnected while current is flowing through the switchgear.