Voltage fluctuations and flicker
CNC Turning is namely Lathe machining, Lathe machining is a portion of mechanical processing.
Lathe machining is always a process that turning tools doing turning machining to a rotary workpiece. On CNC lathes, the operators or the engineers also can use drills, reamers, screw taps, threading dies and knurling tools to make relative machining work. CNC turning is usually applied to machining shafts, plates, bushings and all other workpieces which have rotary surfaces, it is a very widely application in practical mechanical manufacturing.
CNC turning can be divided into rough turning and finish turning, rough turning is for the purpose of machining with big cutting depth and big feed rate, to improve the machining efficiency. However, the precision of rough turning can only be grade IT11, the surface finish can only be Ra 20-10um. On the contrary, semi-finish machining and finish machining usually can only apply high speed but small feeding rate and cutting depth. In this condition, the machining accuracy can be up to grade IT10-7, the roughness can be Ra10-0.6um.
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Voltage fluctuation and flicker are the percentage of the difference between the maximum and minimum values ​​of the voltage relative to the rated voltage when the voltage amplitude changes regularly within a certain range, or the voltage amplitude does not exceed 0.9 pu to 1.1 pu (standard value). A series of random changes. This voltage change is called flicker to express the visual effects of voltage fluctuations on the lamp. Therefore, the flicker is a measure of the degree of susceptibility to lamp flashes caused by voltage fluctuations at different frequencies and the degree of stimuli causing flicker. The voltage fluctuation value is a subjective feeling of the human eye to the light flash.
The flicker limit caused by the user's load is based on the size of the user's load, the ratio of the protocol's power consumption to the power supply capacity and the system's voltage level. Percentage of the allowable voltage fluctuation of the public power supply point of the power system caused by the impact load. Divided into three levels for different specifications and restrictions.
(1) 10kV and below is 2.5
(2) 35~110kV is 2.0
(3) 220kV and above is 1.6
GB12326-2000 "Voltage Allowable Fluctuation and Flicker" specifies the flicker limit values ​​for each level of voltage. It applies to the rapid change of the voltage of the common connection point caused by the fluctuating load and may cause people to feel the light flashing. Occasions.