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中频电炉逆变桥晶闸管烧损故障排除方法
[来源:www.zhongpinshebei.com] [作者:aywl] [日期:17-05-24]

在介绍中频电炉逆变晶闸管烧损常见故障之前,我们先简单的了解一下可控硅中频电源的基本工作原理:交流电通过一个三相桥式整流电路,把50Hz的工频交流 电流整流成直流,再经过一个滤波器(直流电抗器)进行滤波,最后经逆变器将直流变为单相中频交流(200Hz~8000Hz)以供给负载。因此这种中频电 源的工作原理实际就是:电网交流--整流直流--中频交流。 In introduced the common faults of inverter thyristor intermediate frequency electric stove burning before, we first introduce the simple basic working principle of the thyristor intermediate frequency power supply: ac through a three-phase bridge rectifier circuit, the power frequency of 50 hz alternating current into a dc, then through a filter (dc reactor) filter, finally the single-phase medium frequency inverter dc to ac (200 hz ~ 200 hz) in order to supply the load. Therefore, the principle of this kind of medium frequency source is that the electric power grid communication -- the whole flow of direct current -- is the medium frequency communication.   我们以3吨中频电炉为例,举例说明一下中频电源的工作原理:3吨中频电炉的电源供给是公司电网经过变压器,将570V工频50Hz交流电输送到电炉控制电 源,经过三相桥式整流,将570V交流电,整流成为 约750V直流电,经过电抗器滤波后,到逆变电路,经过逆变晶闸管2个桥臂交替导通,得到 1000V的中频电源,经过补偿电容倍压后,将约为2000V的中频交流电源输送到感应线圈,通过磁轭聚磁,涡流原理熔化铁水。 3 tons of intermediate frequency electric stove, for example, we illustrate the working principle of intermediate frequency power supply: 3 tons of intermediate frequency electric furnace power supply is the company's power grid through the transformer, the 570 v power frequency 50 hz alternating current to the furnace control electrical source, through three-phase bridge rectifier, the 570 v alternating current (ac), rectifier to be about 750 v direct current, after reactor filter to inverter circuit, after two thyristor inverter bridge arm alternate conduction, intermediate frequency power supply by 1000 v after compensation capacitor times, will be about 2000 v intermediate frequency ac power to the induction coil, by magnetic yoke, eddy current principle of hot metal melting.   逆变晶闸管烧损,是中频电炉最常见,但最难排除的故障。不管是过压还是过流引起的晶闸管烧损,一般情况都需要用排除法,缩小故障范围,排除故障。 Contravariant thyristor is the most common, but the most difficult problem to rule out. Whether it is overpressure or overflows, it is necessary to use the elimination method to minimize the fault area and to eliminate the fault.   另外的主要原因是电流和大电压失控,引起的高电压失控中频电炉原理的电压升到一定的值时,逆变器颠覆,无法在高阻抗下运行,元件的耐压降低或冷却效果不 好,系统的绝缘性能降低,中频感应电炉电压升高时机器对地短路,检查中频电容和炉子。干扰也可能引起,逆变触发线要高主电路一些。另外就是大电流失控, 中频电压的反压角过小,触发电路是否接触不良,另外还要注意关断时间的一直性。 Another primary reason is that current and voltage is out of control, caused by high voltage control principle of intermediate frequency electric furnace of voltage rises to a certain value, the inverter, can't run, under high impedance component of pressure reducing or cooling effect is not good, the insulation of the system performance is reduced, medium frequency induction furnace of short circuit voltage rise machine, check the intermediate frequency capacitance and stove. Interference may also cause the reverse trigger line to be higher in the main circuit. The other thing is that the large current is out of control, the voltage of the middle frequency voltage is too small, the trigger circuit is not in contact with the bad, and the other is the straightest of the time.

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