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接地电阻柜的使用原理

网址:www.jiedixiang58.com  2020-07-27  作者:admin    阅读:

接地电阻柜和其它的电阻一样,接地电阻柜等在物理学中表示导体对电流阻碍作用的大小。导体的电阻越大,表示导体对电流的阻碍作用越大。不同的导体,电阻一般不同,电阻是导体本身的一种特性。电阻将会导致电子流通量的变化,电阻越小,电子流通量越大,反之亦然。接地电阻柜元件的电阻值大小一般与温度,材料,长度,还有横截面积有关,衡量铝壳电阻受温度影响大小的物理量是温度系数,其定义为温度每升高1℃时电阻值发生变化的百分数。
Grounding resistance cabinet is the same as other resistors. Grounding resistance cabinet represents the size of conductor's blocking effect on current in physics. The greater the resistance of the conductor, the greater the resistance of the conductor to the current. Different conductors have different resistance. Resistance is a characteristic of conductor itself. The smaller the resistance, the greater the electron flow, and vice versa. The resistance value of components in grounding resistance cabinet is generally related to temperature, material, length and cross-sectional area. The physical quantity to measure the resistance of aluminum shell affected by temperature is temperature coefficient, which is defined as the percentage of resistance value change when the temperature increases by 1 ℃.
一、根据电阻器的阻值和误差选用
1、 It is selected according to the resistance value and error of resistor
二、阻值选用:原则是所用电阻器的标称阻值与所需电阻器阻值差值越小越好。
2、 Resistance selection: the principle is that the smaller the difference between the nominal resistance value of the resistor used and the resistance value of the required resistor, the better.
三、误差选用:时间常数RC电路所需电阻器的误差尽量小.一般可选5%以内.对退耦电路,反馈电路滤波电路负载电路对误差要求不太高.可选10%-20%的电阻器。据电阻器的极限参数选用
3、 Error selection: the error of resistor required for time constant RC circuit should be as small as possible. Generally, it can be selected within 5%. For decoupling circuit, feedback circuit, filter circuit, load circuit, the error requirement is not too high. 10% - 20% resistor can be selected. According to the limiting parameters of resistor
四、额定电压:当实际电压超过额定电压时,即便满足功率要求,电阻器也会被击穿损坏。
4、 Rated voltage: when the actual voltage exceeds the rated voltage, the resistor will be damaged even if the power requirement is met.
五、额定功率:所选电阻器的额定功率应大于实际承受功率的两倍以上才能保证电阻器在电路中长期工作的可靠性。我们知道,接地电阻柜行业用的接地电阻柜一般都是用来做制动的,所以又叫制动电阻。凡是惯性大的系统,接地电阻柜减速的时候电机是发电的,会上接地电阻柜送电,接地电阻柜直流电压升高,当电压升到一定值时,这个时候就会用到制动电阻,将电动机产生的能量以热量的形式释放,特别在频繁制动时将要消耗大量的能量,且制动电阻的容量将增大。
5、 Rated power: the rated power of the selected resistor should be more than twice of the actual power to ensure the long-term reliability of the resistor in the circuit. As we know, the grounding resistance cabinet used in the industry is generally used to make braking, so it is also called braking resistance. For systems with large inertia, when the grounding resistance cabinet slows down, the motor generates electricity, and the DC voltage of the grounding resistance cabinet increases. When the voltage rises to a certain value, the braking resistor will be used to release the energy generated by the motor in the form of heat. Especially in frequent braking, a lot of energy will be consumed, and the capacity of the braking resistance will be increased.

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