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弧焊变压器在额定负载率的温升试验中,由于感应式调压器的电压调变率很大,要保证负载时为额定值,焊机空载时初级电压就必须高很多。由于调压器和焊机的容量不同,空载时初级输入电压可高于1.2倍额定电压,这样焊机的铁损就增加很多,直接影响了温升测量的准确度。由于目前还没有相当容量的稳压电源,用调压器通过人为的办法降压在时间上远远跟不上(从负载过渡到空载需降压和空载过渡到负载需升压,并需一定的调节时间),每周期要调整四次,劳动强度太大,且控制也不准确,直接影响了测量数值的准确性。
Arc welding transformer in the rated load rate of temperature rise test, due to the large voltage regulator transformer rate of change, to ensure that the rated load, the primary voltage of the welder no-load must be much higher. As the voltage regulator and the capacity of the welding machine, no-load primary input voltage can be higher than 1.2 times the rated voltage, so the iron loss of the welding machine to increase a lot, directly affects the accuracy of temperature measurement. Due to the fact that there is no current regulated power supply, there is a man-made step-down in voltage regulator that is far behind in time (from load to load to step down and no-load transition to load) and Need to adjust the time), each cycle to be adjusted four times, labor intensity is too large, and the control is not accurate, a direct impact on the accuracy of measurement values.