不同的应用领域对中频电源有不同的要求
[来源:原创] [作者:不详] [日期:17-04-07] [浏览次数:]

设备正常运行时,易出现的故障 The normal operation of equipment, the failure of the   故障现象:设备运行正常,但在正常过流保护动作时,烧毁多支KP晶闸管和快熔。 Fault phenomenon: equipment operation is normal, but in normal over-current protection action, burning more than KP thyristor and the fast fuse.   分析处理:过流保护时,为了向电网释放平波电抗器的能量,整流桥由整流状态转到逆变状态,这时如果а>1500就有可能造成有源逆变颠覆,烧毁多支晶闸管和快熔,开关跳闸,并伴随有巨大的电流短路爆炸声。对变压器产生较大的电流和电磁力冲击,严重时会损坏变压器。 Analysis: over-current protection, in order to to the grid flat wave reactor of energy released, rectifier bridge rectifier state to the inverter state, at this moment if а > 1500 is likely to cause active inverter, burning more than thyristor and the fast fuse, switch trip, and is accompanied by huge short-circuit current explosion. A bigger current and electromagnetic force impact of transformer, serious will damage the transformer.   4、晶闸管 4, thyristor   故障现象:更换晶闸管后,一开机就烧毁晶闸管。 Fault phenomenon: after replacement of thyristor, thyristor burnt a turned on.   分析处理:设备出故障,烧毁晶闸管。在更换新晶闸管后,不要马上开机,首先应对设备进行系统检查,排除故障。在确认设备无故障的情况下,再开机。否则,就会出现一开机就烧毁晶闸管的现象。在压装新晶闸管时,一定要注意压力均衡,否则,就会造成晶闸管内部芯片机械损伤,导致晶闸管的耐压值大幅降,出现一开机就烧毁晶闸管的现象。 Analysis: the equipment is out of order and burned thyristor. After the replacement of new thyristor, don't immediately start up, the first system checks should be made for equipment troubleshooting. In the case of confirmed equipment trouble-free, to boot. Otherwise, there is a computer is burned thyristor phenomenon. When pressed new thyristor, must pay attention to the stress equilibrium, otherwise, will cause internal chip thyristor mechanical damage, lead to sharp drop in pressure value of the thyristor, thyristor burnt a turned on.   一般情况下,可以把中频电源的故障按照故障现象分为完全不能起动和起动后不能正常工作两大类。作为一般的原则,当出现故障后,应在断电的情况下对整个系统作全面检查,它包括以下几个方面: In general, can put the failure according to the failure phenomenon of intermediate frequency power supply is divided into completely unable to not work properly after starting and starting two kinds big. As a general principle, when fault occurs, should be in the case of power cuts a comprehensive inspection of the whole system, it includes the following aspects:   (1)电源:用万用表测一下主电路开关(接触器)和控制保险丝后面是否有电,这将排除这些元件断路的可能性。 (1) power: use a multimeter to measure the main circuit switch (contact) whether there is electricity, and control the fuse behind this would rule out the possibility of these element circuit.   (2)整流器:整流器采用三相全控桥式整流电路,它包括六个快速熔断器、六个晶闸管、六个脉冲变压器和一个续流二极管。在快速熔断器上有一个红色的指示器,正常时指示器缩在外壳里边,当快熔烧断后它将弹出,有些快熔的指示器较紧,当快熔烧断后,它会卡在里面,所以为可靠起见,可以用万用表通断档测一下快熔,以判断它是否烧断。 (2) : rectifier rectifier adopts three-phase fully-controlled bridge rectifier circuit, which includes six quick fuse, six thyristor, six pulse transformer and a fly-wheel diode. On quick fuse has a red indicator, indicator when normal shrinkage in the shell, when burning of fuse break it will pop up, some of the fast fuse indicator is tight, when the fuse to burn, it get stuck inside, so, to be reliable, can use a multimeter discontinuity measure of fuse, to determine whether it burn out.   测量晶闸管的简单方法是用万用表电阻挡(200Ω挡)测一下其阴极—阳极、门极—阴极电阻,测量时晶闸管不用取下来。正常情况下,阳极—阴极间电阻应为无穷大,门极—阴极电阻应在10—50Ω之间,过大或过小都表明这只晶闸管门极失效,它将不能被触发导通。 Simple method of thyristor is measured in multimeter electric block (200 Ω block), measure the cathode, anode, the gate, the cathode resistor, when measuring the thyristor not down. Under normal circumstances, should be infinite resistance between the anode, cathode and gate - cathode resistor should be between 10 to 50 Ω, too big or too small that the thyristor gate failure, it will not be able to trigger conduction.   脉冲变压器次边接在晶闸管上,原边接在主控板上,用万用表测量原边电阻约为50Ω。续流二极管一般不容易出现故障,检查时用万用表二极管挡测其二端,正向时万用表显示结压降约有500mV,反向不通。 Pulse transformer time butt on thyristor, the original edge on the main control board, with the multimeter to measure the original resistance of about 50 Ω. Fly-wheel diode is generally not easy to malfunction, check the measurement with multimeter diode and the other side, is the multimeter display and pressure drop about 500 mv, reverse.

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