Phase Failure Circuit Diagram. Figure 2 19 schematic wiring of a phase failure relay. 2 3 are connected to lines 2 and 3.
2 3 are connected to lines 2 and 3. If a phase failure occurs on l1 the control relay cr c ontacts change state. Phase failure and under over voltage master control motor circuits protection relayin this video we can see you full introduction these protectionof motor.
The windings are identified by.
Typically a phase loss is caused by a blown fuse thermal overload broken wire worn contact or mechanical failure. When one phase of a three phase system is lost a phase loss occurs. This energy is reduced in amplitude over a voltage divider circuit and passed through an optically coupled detector circuit to provide a control signal indicating the presence of energy on all phase conductors of the supply line. A phase loss that goes undetected can rapidly result in unsafe conditions equipment failures and costly downtime.
