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关于变压器有载调压技术的几点新思路

采用单片机技术,它体积小,控制性能强,低功耗,主要功能是实现智能化,使用灵活方便。
Using single-chip microcomputer technology, it is small size, strong control performance, low power consumption, the main function is to achieve intelligent, flexible and convenient to use.
采用步进电机与单片机接口简单,具有快速启停,精确步进,定位准确的特点,正好符合有载调压步进分接的特点。
The stepping motor has the advantages of simple interface with microcontroller, fast start and stop, accurate step and accurate positioning. It is in line with the characteristics of on load, voltage regulation, step by step and tap.
山东变压器厂家排名http://www.jnwdsh.com/步进电机正、反转控制是由A、B、C三相脉冲的相序决定的,若1.、丨1、丨2,依次输出高电平的顺序为人―人0―队――CA->A则电机正转,若脉冲顺序为A―AC―C―CBB―BA―A,则电机反转,而电机运转的速度就决定于P(U)、P.1、P.2三个脉冲信号的频率电机转动的角度决定于脉冲信号的个数,设计中步进电机的运转方向、速度、角度由单片机控制,避免了常规机构中控制运转两个回路,接线复杂的问题。
The stepper motor is, reverse control is determined by the sequence of A, B, C three-phase pulse, if 1.,. 1,. 2, in order to output the high level of people - 0 - person team -- CA->A, the motor is transferred, if the pulse sequence is A - AC - C - CBB - BA A, the motor reversal, and motor running speed is determined by P (U), P.1, P.2 three pulse signal frequency of the motor rotation angle depends on the number of pulse signal, direction of the operation, the stepper motor speed, angle in the design by the MCU control, to avoid the operation of the two loop the conventional control mechanism, wiring complex problems.
2主要硬件电路部分设计输出高电平信号,启动0809A/D开始进行转换,ALE此时亦有效将地址ABC锁存,IN0号回路模拟量进行变换结束后,单片机取走数据。
2, the main hardware circuit design, output high level signal, start 0809A/D start conversion, ALE at this time is also valid to address ABC latch, IN0 loop analog changes after the end of the microcontroller to take data.
在8031单片机与步进电机连接中主要采用光电隔离电路,驱动电路采用VMOSFET恒流斩波驱动技术可以简化电路。
The photoelectric isolation circuit is mainly used in the connection between 8031 single-chip microcomputer and stepping motor, and the drive circuit adopts VMOSFET constant current chopper drive technology, which can simplify the circuit.
3几个问题的说明由于P.1到P.2输出脉冲的频率控制着步进电机的运转速度,所以每发出一个脉冲后有相应的延时,这个任务可以由8031芯片的定时/计数部件T0或T1来完成时间由软件设置。
The 3 explanation of some issues due to the P.1 P.2 output pulse frequency control of stepper motor speed, so every one pulse is issued after the corresponding delay, this task can be composed of 8031 chip timer / counter parts of T0 or T1 to complete the time set by software.
步进电机的步进角度应与有载分开开关的步进分接角度相配合。
The step angle of the stepping motor shall be matched with the step split angle of the load separated switch.
有载分接开关的位置可以用相应的位置开关来表示,以便单片机进行检测。
The position of the load tap changer can be represented by the corresponding position switch so that the single chip microcomputer can detect it.
一、那么为什么变压器铁芯接地又只能是只有一点接地呢?
First, then why is the grounding of transformer core only one point grounding?
因为,一但有两点以上的接地时,两点间或者多点间形成短接的回路,等于通过接地片短接了铁芯柱,短接回路中形成感应环流,使得铁芯局部过热烧坏片间绝缘,也可能造成对油箱壁放电,直至绝缘击穿而烧坏变压器。
Because a, but there are two points above the ground, shorted loop is formed between two or more points, the grounding piece shorted the core column, forming a short loop induction circulation, the core of local overheating burned patch insulation, may also be caused by the discharge of the tank wall, straight to insulation breakdown burn out the transformer.
二、引起变压器铁芯接地的原因:
Two, cause the transformer core grounding:
1、制造时接地片没做好而造成硅钢片短路,或者本身没有做好铁件和铁芯的绝缘处理,有工具或导电体遗留在了铁芯处或油箱内。
1, when the grounding piece is not made, the silicon steel sheet is short circuited, or the insulation of the iron piece and the iron core is not processed in itself, and the tool or the conductor is left behind in the iron core or in the oil tank.
2、由于外界和附件的因素造成多点接地,一般有:
2, because of the external and accessories factors cause multi-point grounding, usually there:
⑴在检修或变压器装配时,由于不注意或检修时个别附件超长、歪斜、擦边等,造成铁芯碰壳体,碰夹件,铁芯夹板碰铁芯柱,硅钢片翘出碰夹板,铁芯下夹件垫脚与硅钢片碰触,温度计过长碰铁芯等。
In the repair or transformer assembly, due to lack of attention or maintenance of individual attachment length, skew, edge, core shell caused by touch, touch clamps, core splint touch iron core columns, steel sheet forming with iron core clamping piece splint, stepping with silicon touch, touch and other core thermometer is too long.
⑵穿钉螺栓过长与硅钢片或箱体短、搭接。
The nail is too long and the silicon steel sheet or bolt body, short lap.
⑶油箱内进入异物或水使硅钢片局部短路。
Enter the water tank to the foreign or local short circuit of silicon steel sheet.
⑷铁芯绝缘受潮或损伤、箱底沉积淤泥和水份、木块受潮使得绝缘下降,形成有阻接地。
The core insulation damp or damage, the silt and water, wood makes damp down insulation, forming a resistance grounding.
⑸金属粉或螺丝脱落进入油箱中,吸附在铁芯和油箱之间形成多点接地。
The metal powder or screw off into the tank, adsorption form multi point grounding between the core and the tank.
三、变压器铁芯接地的处理:
Three 、 grounding of transformer iron core:
变压器铁芯接地检查一般是用兆欧表检测钢夹件与铁芯间的绝缘,如果测得穿心螺杆绝缘电阻为零,则可判断有接地点,然后由上而下逐渐进行排查。也有用万用表通电测量的,但需要做好安全措施,并由有经验的专业人员来操作。
The transformer core grounding inspection is generally megger testing of steel clamp and insulating iron, if measured through screw insulation resistance is zero, can judge the grounding point, and then from the top down gradually for investigation. Multimeter is also used for electrical measurement, but safety measures need to be made and operated by experienced professionals.
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