Control unit for electrical system at retail fuel dispenser, comprises current sensors in the supply phases to the pump motor, means for peak lopping, comparison to reference and supply tripping

摘要

Fuel is stored in a tank (2) and pumped (4) to a terminal (8) with distribution to vehicles through a pipe (9) and pistol (10). Electricity is supplied through circuit breakers (11,14) and monitored by an electronic control unit (19). The control unit has current sensors, typically Hall type with peak lopping and the signals are compared to reference values related to load and used where necessary and in conjunction with timing relays to trip the supply