Control Systems

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26 Connection scheme for phase failure relay As shown in the figure the relay is connected in the incoming supply phases. The control contact (11-12) is connected in series with the contactor coil circuit. If the starting time of the motor is more, to avoid undesirable tripping, the control contact should be by-passed during starting. Brief description of a relay which works on the basis of detection of negative sequence current is explained as follows. The relay has two built-in current transformers which sense currents of the motor.

Latching relay has two coils, an operating coil which is also referred to as latch coil and an unlatch coil. When the latch coil is energised the relay operates and is held in the energised position either by a mechanical latch or a permanent magnet. The relay remains in the energised position even when the latch coil is de-energised. The relay can be brought back to the deenergised position only when the unlatch coil is energised. The relay construction can be of two types depending on how the relay is held in the energised position when the latch coil is de-energised.

These timers are thermal timers, pneumatic timers, electronic timers and motor driven (synchronous) timers. 1 Thermal Timer Principle of working of a thermal timer is the same as that of a bimetallic overload relay discussed earlier. These are available with a limited delay range of 0–20 sec. The timing error can be very large of the order of ± 10 to 30%. By timing error it is meant that the time variation (plus or minus) between successive timing operations on the same timer represented as a percentage of maximum range of the timer.

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