A disconnector device including an isolator connected between a first terminal and to a second terminal, and a sleeve positioned around the isolator and moveable between an un-extended position prior to the isolator operating and an extended position after the isolator operates, the sleeve being configured to trap debris produced by operation of the isolator.

Examples described herein relate to a power management system. The power management system may include an input power filter coupled between a common power bus having a first voltage level and a load. The input power filter may include a variable impedance circuit coupled to an input capacitor. Further, the power management system may include a bus voltage controller coupled to the input power filter to detect a transient event causing a surge in a load current drawn by the load and to alter an impedance of the variable impedance circuit to limit an input current flowing via the variable impedance circuit, thereby maintaining voltage on the common power bus within a predefined range from the first voltage level.

Examples described herein relate to a power management system. The power management system may include an input power filter coupled between a common power bus having a first voltage level and a load. The input power filter may include a variable impedance circuit coupled to an input capacitor. Further, the power management system may include a bus voltage controller coupled to the input power filter to detect a transient event causing a surge in a load current drawn by the load and to alter an impedance of the variable impedance circuit to limit an input current flowing via the variable impedance circuit, thereby maintaining voltage on the common power bus within a predefined range from the first voltage level.

A lighting relay panel may include lower-cost features or components related to improved safety and reliability. In some cases, the relay panel includes a power supply capable of protecting the panel from high-voltage and high-current transients. A microcontroller may determine a power interruption based on a zero-cross signal received from the power supply, and may also configure latching relays during the interruption. In some implementations, the relay panel includes a relay sense circuit that is capable of receiving actuation signals from multiple relays connected to different phases of a power signal, and the microcontroller may synchronize or repeat the actuations based on a signal from the relay sense circuit. The microcontroller may generate relay addresses based on the relay positions within the relay panel. In some cases, the relay panel may include isolation circuits that are capable of providing an isolated control signal having an improved voltage range.

A lighting relay panel may include lower-cost features or components related to improved safety and reliability. In some cases, the relay panel includes a power supply capable of protecting the panel from high-voltage and high-current transients. A microcontroller may determine a power interruption based on a zero-cross signal received from the power supply, and may also configure latching relays during the interruption. In some implementations, the relay panel includes a relay sense circuit that is capable of receiving actuation signals from multiple relays connected to different phases of a power signal, and the microcontroller may synchronize or repeat the actuations based on a signal from the relay sense circuit. The microcontroller may generate relay addresses based on the relay positions within the relay panel. In some cases, the relay panel may include isolation circuits that are capable of providing an isolated control signal having an improved voltage range.

A method and apparatus for operating a power distribution system, includes providing a solid state switch downstream of a power source and upstream of an electrical load, the solid state switch operable in a conducting mode that enabling conduction from upstream to the output and a non-conducting mode that disables conduction from the input to the output, and providing a transient voltage suppressor defining a breakdown voltage upstream of the solid state switch.

A method and apparatus for operating a power distribution system, includes providing a solid state switch downstream of a power source and upstream of an electrical load, the solid state switch operable in a conducting mode that enabling conduction from upstream to the output and a non-conducting mode that disables conduction from the input to the output, and providing a transient voltage suppressor defining a breakdown voltage upstream of the solid state switch.

A blade angle feedback ring assembly for an aircraft engine propeller having adjustable angle blades is provided. The feedback ring assembly comprises a feedback ring coupled to rotate with the propeller, the engine configured such that a first electrically-conductive path is defined between the propeller and the engine via the feedback ring, and an electric current conduction element provided between the propeller and the engine to define a second electrically-conductive path between the propeller and the engine in parallel to the first path, the second electrically-conductive path configured with a lower electrical resistance to conduction between the propeller and the engine than the first electrically-conductive path.

A circuit arrangement for a surge protection device for protecting multiple DC or AC power lines. The circuit arrangement includes a plurality of DC or AC power line inputs, a negative potential or neutral input, a ground potential input, a surge protection component having one or more surge elements, a rectification circuit including a plurality of diodes, and an alarm circuit for receiving a status output from the surge protection component.

A system and method for autonomous monitoring and active defense of lightning includes a current sensor installed on a metal object, an antenna installed near the current sensor, a signal processing and warning module (SPWM), which is configured to detect received current and field pulse signals, and issuing an early warning signal when detecting origination and development of pulses of a downward stepped leader and an upward leader, where the early warning signal is sent to a controlled surge protection device (CSPD) and/or a polarized reconfigurable lightning protection antenna, and the CSPD completes on/off actions before a first return stroke and/or the lightning protection antenna becomes only to receive/transmit horizontally polarized electromagnetic waves.