Features of Siemens APT Relays – AC Relays

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

1. Since the current through the AC electromagnetic relay is a changing alternating current, the magnetic flux in the magnetic circuit also changes with the alternation (sinusoidal law instead of straight line law). The suction of the armature is varied between 0 and the maximum, so the suction of the AC electromagnetic relay is pulsating, and the change frequency is twice the AC frequency, and the suction of this pulsation will make the armature flutter, so measures should be taken in the structure to eliminate the flutter and affect the life of the relay

2. Because when the AC power passes through the core, the alternating magnetic flux is generated, so that the eddy current is generated in the core, and the magnetic field generated by the eddy current is opposite to the direction of the original magnetic flux, so that a part of the magnetic flux becomes a leakage flux and is lost, resulting in magnetic loss

3. In addition, the DC electromagnetic relay only has a back EMF at the moment of turning on the power supply or cutting off the power supply, and in a stable state, the current through the coil is only determined by the resistance, and the AC electromagnetic relay, even in a stable case, there is a back EMF, so the current of the AC relay is mainly not determined by the resistance, but by the inductive reactance of the coil, which shows that when calculating the AC relay circuit, the inductance of the coil AC electromagnetic relay coil current must be determined by the reactance (inductance) of the coil

Features of Siemens APT Relays – AC Relays

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