A circuit breaker monitoring system and method includes a vibration sensor, a processing unit, and an output unit. The vibration sensor is configured to be mounted to a circuit breaker and to acquire a temporal vibration signal over at least a temporal portion of a closing operation of the circuit breaker. The closing operation comprises: initiation of the closing operation; latch release; movement of a moveable contact towards a fixed contact; contact touch of the moveable contact with the fixed contact; stop of movement of the moveable contact. The sensor provides the temporal vibration signal to the processing unit, which determines a plurality of physical switch events and corresponding plurality of time points of the plurality of physical switch events over the closing operation of the circuit breaker.

A system and method for monitoring a circuit breaker monitoring system includes a vibration sensor, a processing unit, and an output unit. The vibration sensor is mounted to a circuit breaker acquires a temporal vibration signal over at least a temporal portion of a closing operation of the circuit breaker, wherein the closing operation comprises: initiation of the closing operation, latch release, movement of a moveable contact towards a fixed contact, contact touch of the moveable contact with the fixed contact, and stop of movement of the moveable contact. The vibration sensor provides the temporal vibration signal to the processing unit, which determines a plurality of features of the closing operation and an indication of operational functionality of the circuit breaker.

A method of controlling an electromagnetic relay includes supplying a first voltage to an exciting coil to bring a movable terminal into contact with a fixing terminal; causing a coupling state determination unit to determine that a coupling failure is detected in a case where the movable terminal is not brought into contact with the fixing terminal and the electromagnetic relay is not turned on despite the supplying the first voltage to the exciting coil; and supplying a second voltage higher than the first voltage from a booster circuit to the exciting coil in a case where the coupling state determination unit determines that the coupling failure is detected. The second voltage is generated by boosting the first voltage by the booster circuit.

A test bench for a contactor bulb includes: a frame, configured to fix the bulb therein, and an actuation device, borne by the frame and including an output shaft, centred on a longitudinal axis and translationally movable with respect to the frame parallel to the longitudinal axis between a front position and a rear position, the output shaft being configured to be connected to an actuation rod of the bulb. The actuation device is a moving magnet electromagnetic actuator.

The application provides a gas density relay with online self-check function and its check method, which are used for high voltage and medium-voltage electrical equipment. The gas density relay includes a gas density relay body, a first pressure sensor, a temperature sensor, a force measuring sensor, a driving contact action mechanism and an intelligent control unit. The driving contact action mechanism is configured to directly or indirectly drive the signal action mechanism of the gas density relay body to displacement, so that the gas density relay body will have contact signal action. The intelligent control unit will detect the alarm and/or blocking contact signal action value and/or return value of the gas density relay body according to the density value when the contact acts. Checking the gas density relay can be completed without maintainer coming to the site, which improves the reliability of the power grid, improves the efficiency, reduces the operation and maintenance cost, and can implement the maintenance free of the gas density relay.

The present utility model discloses an adjustable contactor including: a static contact fixed in the contactor; a movable contact which is connected in the movable contact bracket through a contact spring, and which makes contact with the static contact in accordance with the movement of the movable contact bracket in the contactor; the contactor further includes adjusting knobs provided in the movable contact bracket at one end in connection with the contact spring while corresponding to the contact springs connected with individual movable contacts, the adjusting knob being set so that adjustment of the compression or release of the contact spring is achieved by rotating the adjusting knob so as to adjust the contact pressure of the movable contact.

A drive system for a switch can include a control module configured to control, directly or indirectly, a state of a switch between a first state and a second state. The drive system can also include a transition timing system configured to measure a transition time that the switch is in transit between the first state and the second state.

The present disclosure relates to a molded case circuit breaker. In accordance with one aspect of the present disclosure, a molded case circuit breaker for use in connection with a main busbar provided on a distribution board panel includes a power-source-side terminal provided to a front portion of a case and having a terminal assembly hole formed at an upper portion thereof; a base bus supporter comprising a connector protruding from a front surface thereof so as to engage with the main busbar installed on one side of the distribution board panel, the base bus supporter being coupled to an upper surface and a lower surface of the power-source-side terminal; an auxiliary cover plate coupled to an upper portion of the power-source-side terminal and provided with a temperature measurement hole communicating with the terminal assembly hole.

A method of monitoring a contact force between electrical contacts in a mechanical contactor. The method includes receiving, from a force sensor, a signal including information about a base force sensed by the force sensor between a stationary core and a base; determining a magnitude of the contact force based on the received information; and outputting information based on the determined magnitude to an operator.

A testing system includes a truck carrying a circuit breaker, a fixed contact, and an actuator piston connected to a movable contact. A test platform supports the truck in a contact testing position and includes a sensor circuit mounted on the test platform and positioned under the truck and aligned with the circuit breaker when the truck is on the test platform in the contact testing position. The sensor circuit is configured to acquire displacement data of the actuator piston when the movable electrical contact is moved between the open and closed positions. A controller is coupled to the sensor circuit and configured to receive the displacement data and determine electrical contact erosion within the circuit breaker.