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Question:

How does the return factor of the voltage relay understand

How does the return factor of the voltage relay understand

Answer:

Voltage relay return coefficient concept: (assuming the action voltage is 100V) When the voltage gradually increased from 0, the relay does not move. When the voltage reaches 100V, the coil pulls the armature and the contact closes. At this time 100V called "action voltage". If the voltage is maintained at 100V, the relay will always catch. When the voltage from 100V slow down, 99V, 98V, 97V, the relay will remain in the state of the pull, in the fall 96V, 95V ... ..., perhaps down to 80V, the relay suddenly released. At this time 80V is called "return voltage". The return voltage divided by the operating voltage is the "return factor".
May 9, 2017
AC voltage relay (in fact, AC contactor also has this feature) coil in the power when the rated voltage, due to the original armature is in the open state, the armature pull action, the need for a larger starting pull current (better than the holding current after the pull Several times) to produce enough magnetic field suction. After the armature is closed, only the lower part of the work is required to keep the armature in the pull-on state. So even if the coil voltage to reduce a certain value will not release the armature (armature release voltage and coil rated voltage ratio called return coefficient).
May 9, 2017
DC relay also has a return factor, but the reason is different, there is a remnant of the armature causes the armature to be released at a lower voltage.
May 9, 2017

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