ZR-JEFR开关柜电缆三相电负载连接方法的选择
详细描述
江苏春晨电缆有限公司生产ZR-JEFR开关柜电缆1、适用于各种低压开关柜及电机用引接导线。
2、导体采用绞合的镀锡铜丝，电缆导体连续运行**高温度为90℃。
3、本产品采用乙丙橡皮**缘，丁晴护套，符合环保要求。
4、外护套具有很好的阻燃性及耐油、耐**性能。
形、三角形连接时三相交流电路的电功率
The electric power of a three phase AC circuit in a form and a triangle connection
在三相交流电路中，总负载消耗的功率等于各相负载消耗的有功功率之和，即ZR-JEFR开关柜电缆三相电负载连接方法的选择
In a three-phase AC circuit, the power consumed by the total load is equal to the sum of the active power consumed by each phase load, that is, the sum of the active power consumed by each phase load.
P=Pu+Pv+Pw
P=Pu+Pv+Pw
当三相负载对称时，不论是星形连接（Y）还是三角形连接（△），三相中UΦ、IΦ和cosΦ（功率因素）都是一样的，所以每一相中的功率大小相等，因此三相功率为单相功率的三倍，即三相功率P=3PΦ，表达式为：
When the three-phase loads are symmetrical, regardless of star connection (Y) or triangular connection (delta), U, I in three phase Phi Phi and phi cos (power factor) are the same, so each phase power equal to three times, so the three-phase power single-phase power, three-phase power P= 3P. The expression is:
三相交流电功率公式
Three phase AC power formula
因为在线路中测量线电压和线电流较为方便，因而常用线电压、线电流值来计算三项功率。
Because it is more convenient to measure line voltage and line current in the line, the line voltage and line current value are often used to calculate three items of power.
当负载为星形连接时，且各相负载平衡时，IL=IΦ
When the load is star connected, and the load balance of each phase, IL=I
线电压
Line voltage
当负载为三角形连接时，且各相负载平衡时，UL=UΦ
When the load is a triangle connection, and the load balance of each phase, UL=U
线电流
Line current
因此不论负载是星形还是三角形，将以上关系式代入P=3UΦIΦcosΦ中得：
Therefore, whether the load is a star or a triangle, the above formula is replaced in P=3U I diameter cos diameter.
有功功率ZR-JEFR开关柜电缆三相电负载连接方法的选择
active power
同理，三相对称负载的无功功率为：
In the same way, the reactive power of the three phase symmetric load is as follows:
无功功率
Reactive power
由视在功率视在功率得出：
From the view of power, the power is obtai**.
三相交流电路视在功率
Three phase AC circuit view in power
注意：上述公式中字UL、IL是线电压和线电流。
Note: the word UL and IL are line voltage and line current in the above formula.
进阶思考
Advanced thinking
例题：有一三相电动机、每相绕组的等效电阻R=29欧姆，等效感抗XL=21.8欧姆，求在下列情况下电动机的相电流、线电流**从电源输入的功率，并比较所得结果。
Examples: a three-phase motor, the equivalent resistance of R=29 ohms per phase winding, equivalent inductance XL=21.8 ohm, power and phase current, the motor in the context of a line current from the power supply input level, and **pare the results.
绕组连接成星形接于UL=380V的三相电源上。
The windings are connected to a three phase power supply that is connected to the UL=380V.
绕组连接成三角形接于UL=220V的三相电源上。
The winding is connected to a triangle connected to a three phase power supply of UL=220V.
解：过程就不写出来了，留给大家思考，只写结果
Solution: the process will not be written out, left to everyone to think, only write the results
星形连接时：相电流IΦ=6.1A、线电流IL=6.1A、电功率=3.2千瓦。
Star connection: phase current I =6.1A, line current IL=6.1A, electric power =3.2 kilowatt.
三角形连接时：相电流IΦ=6.1A、线电流IL=10.**、电功率=3.2千瓦。
When the triangle is connected, the phase current is I (=6.1A), line current IL=10.**, and electric power =3.2 kilowatt.
比较结果：
**parison results:
只要电动机每相绕组承受的电压不变，则电动机的输入功率不变。因此，当电源线电压为380V时，电动机绕组应连接成星形，而当电源线电压为220V时，电动机的绕组应连称三角形。在这两种连接方法中，仅线电流在三角形连接时比星形连接大√3倍，而相电流、相电压及功率都没有改变。
As long as the voltage of each phase of the motor is constant, the input power of the motor is constant. Therefore, when the power line voltage is 380V, the motor windings should be connected into a star, and when the power line voltage is 220V, the winding of the motor should be even triangle. In these two kinds of connection methods, only the line current in the triangle connection than a star connected large tick 3 times, and the phase current, and power has not changed.
2、导体采用绞合的镀锡铜丝，电缆导体连续运行**高温度为90℃。
3、本产品采用乙丙橡皮**缘，丁晴护套，符合环保要求。
4、外护套具有很好的阻燃性及耐油、耐**性能。
形、三角形连接时三相交流电路的电功率
The electric power of a three phase AC circuit in a form and a triangle connection
在三相交流电路中，总负载消耗的功率等于各相负载消耗的有功功率之和，即ZR-JEFR开关柜电缆三相电负载连接方法的选择
In a three-phase AC circuit, the power consumed by the total load is equal to the sum of the active power consumed by each phase load, that is, the sum of the active power consumed by each phase load.
P=Pu+Pv+Pw
P=Pu+Pv+Pw
当三相负载对称时，不论是星形连接（Y）还是三角形连接（△），三相中UΦ、IΦ和cosΦ（功率因素）都是一样的，所以每一相中的功率大小相等，因此三相功率为单相功率的三倍，即三相功率P=3PΦ，表达式为：
When the three-phase loads are symmetrical, regardless of star connection (Y) or triangular connection (delta), U, I in three phase Phi Phi and phi cos (power factor) are the same, so each phase power equal to three times, so the three-phase power single-phase power, three-phase power P= 3P. The expression is:
三相交流电功率公式
Three phase AC power formula
因为在线路中测量线电压和线电流较为方便，因而常用线电压、线电流值来计算三项功率。
Because it is more convenient to measure line voltage and line current in the line, the line voltage and line current value are often used to calculate three items of power.
当负载为星形连接时，且各相负载平衡时，IL=IΦ
When the load is star connected, and the load balance of each phase, IL=I
线电压
Line voltage
当负载为三角形连接时，且各相负载平衡时，UL=UΦ
When the load is a triangle connection, and the load balance of each phase, UL=U
线电流
Line current
因此不论负载是星形还是三角形，将以上关系式代入P=3UΦIΦcosΦ中得：
Therefore, whether the load is a star or a triangle, the above formula is replaced in P=3U I diameter cos diameter.
有功功率ZR-JEFR开关柜电缆三相电负载连接方法的选择
active power
同理，三相对称负载的无功功率为：
In the same way, the reactive power of the three phase symmetric load is as follows:
无功功率
Reactive power
由视在功率视在功率得出：
From the view of power, the power is obtai**.
三相交流电路视在功率
Three phase AC circuit view in power
注意：上述公式中字UL、IL是线电压和线电流。
Note: the word UL and IL are line voltage and line current in the above formula.
进阶思考
Advanced thinking
例题：有一三相电动机、每相绕组的等效电阻R=29欧姆，等效感抗XL=21.8欧姆，求在下列情况下电动机的相电流、线电流**从电源输入的功率，并比较所得结果。
Examples: a three-phase motor, the equivalent resistance of R=29 ohms per phase winding, equivalent inductance XL=21.8 ohm, power and phase current, the motor in the context of a line current from the power supply input level, and **pare the results.
绕组连接成星形接于UL=380V的三相电源上。
The windings are connected to a three phase power supply that is connected to the UL=380V.
绕组连接成三角形接于UL=220V的三相电源上。
The winding is connected to a triangle connected to a three phase power supply of UL=220V.
解：过程就不写出来了，留给大家思考，只写结果
Solution: the process will not be written out, left to everyone to think, only write the results
星形连接时：相电流IΦ=6.1A、线电流IL=6.1A、电功率=3.2千瓦。
Star connection: phase current I =6.1A, line current IL=6.1A, electric power =3.2 kilowatt.
三角形连接时：相电流IΦ=6.1A、线电流IL=10.**、电功率=3.2千瓦。
When the triangle is connected, the phase current is I (=6.1A), line current IL=10.**, and electric power =3.2 kilowatt.
比较结果：
**parison results:
只要电动机每相绕组承受的电压不变，则电动机的输入功率不变。因此，当电源线电压为380V时，电动机绕组应连接成星形，而当电源线电压为220V时，电动机的绕组应连称三角形。在这两种连接方法中，仅线电流在三角形连接时比星形连接大√3倍，而相电流、相电压及功率都没有改变。
As long as the voltage of each phase of the motor is constant, the input power of the motor is constant. Therefore, when the power line voltage is 380V, the motor windings should be connected into a star, and when the power line voltage is 220V, the winding of the motor should be even triangle. In these two kinds of connection methods, only the line current in the triangle connection than a star connected large tick 3 times, and the phase current, and power has not changed.