PROTECTION DEVICE SINGLE PHASE electrical load is connected to the non-stationary one phase of three-phase four MAINS

摘要

Proposed protection device a single-phase electrical load, nonstationary connected to one of the phases of the three-phase four-wire power supply. The security device does not transmit power to the load unacceptable entangling among themselves at the neutral and one of the line conductors.; Said safety device comprises two electromagnetic relay, two LEDs and three-pole toggle switch.; In the practice of two-wire devices protect its output connected to single-phase electrical load, feeding voltage 220 V and the wire (the three line wires and one - neutral) input - to the respective three-phase four-wire network.; When properly connected, the protective device to a three-phase four-wire network (without neutral wire entanglement with one of the line conductors), and when the load on its tumbler enters phase voltage of 220 V, the presence of which is displayed on the corresponding LED indicator.; In case of incorrect connection to the three-phase four-wire network (entanglement neutral wires with one of the line conductors) security device when incorporated tumbler does not transmit the load line voltage network hazards to 380 and outputs the signal to the appropriate indicator of incorrect connection to the network.