Abstract: A diagnostic system for monitoring a mechanical trip mechanism of a circuit interrupter provides advanced diagnostics. The trip mechanism comprises a D-shaft that is actuated by the trip unit, an operating mechanism that is actuated by the D-shaft, and a pole shaft that is actuated by the operating mechanism to physically separate the separable contacts. During every opening operation, the diagnostic system determines how much time elapses between the D-shaft beginning to move to its open position and the pole shaft reaching its open position, in order to detect degradation of the trip mechanism as early as possible. This ensures that suboptimal performance is detected even if the trip mechanism is meeting the minimum requirements for acceptable performance. A user is notified once the performance has degraded to a level that is considered concerning before the trip mechanism fails altogether, saving significant time and resources and preventing more widespread damage.

Abstract: A diagnostic system for monitoring a mechanical trip mechanism of a circuit interrupter provides advanced diagnostics. The trip mechanism comprises a D-shaft that is actuated by the trip unit, an operating mechanism that is actuated by the D-shaft, and a pole shaft that is actuated by the operating mechanism to physically separate the separable contacts. During every opening operation, the diagnostic system determines how much time elapses between the D-shaft beginning to move to its open position and the pole shaft reaching its open position, in order to detect degradation of the trip mechanism as early as possible. This ensures that suboptimal performance is detected even if the trip mechanism is meeting the minimum requirements for acceptable performance. A user is notified once the performance has degraded to a level that is considered concerning before the trip mechanism fails altogether, saving significant time and resources and preventing more widespread damage.

Abstract: A circuit interrupter including a busbar, a Rogowski coil disposed around the busbar and structured to sense current having a first frequency flowing through the busbar, a test injector circuit structured to input a test signal having a second frequency to the Rogowski coil, high or band pass filter circuitry structured to receive an output of the Rogowski coil, the output including a first component having the first frequency and being proportional to the current through the busbar and a second component having the second frequency and being proportional to a temperature of the Rogowski coil, and to attenuate the first component of the Rogowski coil output, and an electronic trip unit including a temperature measurement unit structured to receive an output of the high or band pass filter circuitry and to estimate the temperature of the busbar based on the output of the high or band pass filter circuitry.

Abstract: A data connection apparatus of a supporting apparatus includes a stationary part and a movable part. One of the stationary and movable parts has a circuit board having a number of electrically conductive pads, and the other has a receptacle within which the circuit board is received, such as when a circuit interrupter is moved to an installed position within a cassette of a draw-out switchgear cabinet. The data connection apparatus includes a housing within which the receptacle is formed, with the housing having a plurality of electrical contacts within the receptacle. The housing and the circuit board each have relieved regions in the exemplary form of ramped surfaces and edges that facilitate reception of the circuit board in the receptacle. Moreover, the circuit board and the housing are situated on structured that afford a certain level of flexibility to further facilitate reception of the circuit board in the receptacle.

Abstract: A data connection apparatus of a supporting apparatus includes a stationary part and a movable part. One of the stationary and movable parts has a circuit board having a number of electrically conductive pads, and the other has a receptacle within which the circuit board is received, such as when a circuit interrupter is moved to an installed position within a cassette of a draw-out switchgear cabinet. The data connection apparatus includes a housing within which the receptacle is formed, with the housing having a plurality of electrical contacts within the receptacle. The housing and the circuit board each have relieved regions in the exemplary form of ramped surfaces and edges that facilitate reception of the circuit board in the receptacle. Moreover, the circuit board and the housing are situated on structured that afford a certain level of flexibility to further facilitate reception of the circuit board in the receptacle.

Abstract: A circuit interrupter including a busbar, a Rogowski coil disposed around the busbar and structured to sense current having a first frequency flowing through the busbar, a test injector circuit structured to input a test signal having a second frequency to the Rogowski coil, high or band pass filter circuitry structured to receive an output of the Rogowski coil, the output including a first component having the first frequency and being proportional to the current through the busbar and a second component having the second frequency and being proportional to a temperature of the Rogowski coil, and to attenuate the first component of the Rogowski coil output, and an electronic trip unit including a temperature measurement unit structured to receive an output of the high or band pass filter circuitry and to estimate the temperature of the busbar based on the output of the high or band pass filter circuitry.