Over-speed prewarning protection method for generator of wind generating set
A technology for overspeed protection of wind turbines, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as the inability to realize overspeed warning and protection of generators, and achieve the effect of easy inspection
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[0023] The wind generator over-speed early warning protection method provided by the present invention can realize the following functions: 1) Detect the current speed of the motor, and output the result according to the (0~10VDC) analog quantity; 2) Determine whether the current speed of the motor exceeds the setting Set the value, and output the result as a dry node signal.
[0024] Reference figure 1 , The present invention uses two independent proximity switch sensors to count the teeth of the same (60-tooth) toothed disk (and the speed of the toothed disk and the impeller are also synchronized) to realize the speed detection, the sensor output The duty cycle of the frequency signal is 50% and the peak-to-peak value is 24VDC. One of the frequency signals is sent to the over-speed protection device, and the over-speed protection device determines whether the motor speed exceeds the set protection value. If the motor speed exceeds the set protection value, the module will outpu...
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