Method and device for limiting conversion frequency of automatic transfer switch and automatic transfer switch

Abstract

The invention discloses a method for limiting the conversion frequency of an automatic transfer switch, which is used to limit the number of conversion actions of the automatic transfer switch within a unit time to not exceed the preset maximum number of conversion actions N; the preset timing duration is the unit time and can be After the timing is completed, Z timing units that are automatically transferred to the non-timing state, Z≥N; A is compared with N, and if A≥N, the conversion action is prohibited; if A<N, the conversion action is executed and a timing unit in a non-timing state is started to start timing. The invention also discloses a switching frequency limiting device for an automatic transfer switch and an automatic transfer switch. Compared with the prior art, the present invention achieves the limitation of the switching times of the automatic transfer switch per unit time in a simpler and quicker manner, and has better real-time performance.

Description

technical field [0001] The invention relates to an automatic transfer switch, in particular to a method for limiting the transfer frequency of an automatic transfer switch. Background technique [0002] The automatic transfer switch is usually driven by a motor or an electromagnet to perform the conversion action. In the occasion of power consumption where the grid voltage fluctuates greatly, the automatic transfer switch may switch frequently. Frequent switching back and forth will make the coil of the motor or electromagnet It is often in the energized state. If the heat dissipation conditions are limited, the slowly accumulated heat will cause the motor or electromagnet coil to overheat, which will not only reduce the service life of the coil, but even cause serious consequences such as a fire in the coil. [0003] The usual way to prevent frequent switching of the switch is to compare the automatic switching frequency of the switch with the number of switching per unit t...

AI Technical Summary

Problems solved by technology

[0004] The biggest disadvantage of this type of method is that the time interval between the first and last conversion actions must be calculated before each conversion action, and the time interval combined with the number of conversion actions is converted into the conversion action frequency, and it is only after the above calculations are completed that it can be judged whether the conversion is allowed Action, that is, more calculation steps are required before the execution of each conversion action, and the code is more complicated

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