The Ground Break system of solid-state ground fault signaling relays, sensors, and monitor panels provides a new dimension in power-system protection. These components can be combined to operate at lower magnitudes of ground fault current and shorter time delays than conventional overcurrent protective devices. The built-in memory function integrates intermittent faults with time providing protection against low level arcing faults. The components which comprise the system are:
Solid-State Relay – Used in conjunction with devices having an electric trip or shunt trip, this relay will sense ground currents and cause the interrupter to open when these currents reach a preselected value for a preselected length of time. Optional selective interlocking is available for a fully coordinated system. This type of relay initiates an instantaneous trip when a fault occurs in its own zone. In addition it will block upstream zone selective relays for a pre-set delay time to allow the downstream breaker to clear the fault.
Monitor Panel – This panel provides a ground fault indicator, control power, and TEST and RESET buttons. The control circuitry offers the ability to test the complete Ground Break system with or without tripping the interrupter.
Current Sensor – The current sensor, available in solid- or split-core construction for easy installation, includes an integral test winding for checkout of the complete system. A large variety of window sizes is available.
Also available in Ground Break System Type MD for Mining Duty Applications.
Electric Accessories and Electric Supplies 