Abstract:
An actuator, such as a motor of a power distribution switching device, may be operated by measuring at least one temperature parameter associated with an energy storage device (e.g., a battery) of the actuator, and establishing a recovery period and a reference voltage based on a measured temperature parameter. The reference voltage represents a sufficient terminal voltage of the energy storage device in the operational condition. During testing, a load is applied to the energy storage device for a predetermined time period, and the terminal voltage for the energy storage device is measured during the predetermined time period and compared with the reference voltage as a measure of the capability of the energy storage device to deliver an operational load. Following testing, actuator operation is inhibited for the established recovery period to allow the energy storage device to recover the capability to deliver the operational load. Actuator operation is allowed after the expiration of the actuator recovery period if the measured terminal voltage exceeds the reference voltage at that time.
Abstract:
Fuse assemblies, system and kits and methods for assembling fuses include a fuse body that may be universally and interchangeably used with a plurality of different end fittings providing various fuse configurations for connection to electrical circuits. The highly adaptable fuse construction allows fuses to be manufactured and assembled using a reduced number of parts that need to be stocked in order to manufacture a complete line of fuses, and further to more quickly provide replacement fuses to customers.
Abstract:
The life of load tap changer contacts is monitored by detecting an arcing event; identifying arcing surfaces involved in the arcing event; calculating a per-unit loss of life for the identified arcing surfaces as a result of the arcing event; updating estimates of cumulative erosion for the arcing surfaces; comparing the updated estimates of cumulative erosion to a first threshold value; and signaling for action when at least one of the updated estimates of cumulative erosion exceeds the first threshold value.
Abstract:
Insulated vacuum switchgear and active switchgear elements therefor are provided with a rigid support structure mechanically isolating a vacuum insulator from axial loads in use without reinforcing or insulating encapsulations. At least one of the elastomeric insulating housing and the support structure directly contacts an outer surface of the insulator. Systems and methods for assembling the switchgear are also provided.
Abstract:
An apparatus for coupling an electrical connector to a cable is provided. The apparatus includes an electrical connector having at least one tab extending radially out from the electrical connector and a housing rotatably coupled to the electrical connector. The housing includes at least one first channel disposed along an interior of the housing, wherein the at least one tab is configured to slidably engage the first channel. The housing also includes a spacer applying a first force in a first direction to the electrical connector. The housing also includes at least one tab retention member disposed along the interior of the housing, wherein the tab retention member is annularly disposed from the first channel and prevents the electrical connector from traveling beyond a predetermined distance in the first direction.