How to choose welding leakage current
First calculate what your total power is, then select the leakage switch according to the power.The power / voltage is equal to the current. For example, the total power 4KW, then 4000/220=18A.The rated current of the leakage switch is greater than the load current.In general, the total leakage switch is selected by 1.5 times the load current, 18A*1.5=27A.There is no leakage switch for 27A, soThe leakage switch should select 32A.The leakage current is selected by 30MA.
First calculate what your total power is, then select the leakage switch according to the power.The power / voltage is equal to the current. For example, the total power 4KW, then 4000/220=18A.The rated current of the leakage switch is greater than the load current.In general, the total leakage switch is selected by 1.5 times the load current, 18A*1.5=27A.There is no leakage switch for 27A, soThe leakage switch should select 32A.The leakage current is selected by 30MA.
The working principle of the welding machine is different, and the requirements of the leakage protection are different.On the choice of welding leakage action current, we must first determine the working current, the working current can be calculated according to current / voltage = power calculation, calculate the working current of the welding machine, taking into account the characteristics of the welding work (a short time, the current instantaneous impact of large) choice, leakage current than the normal work some current. According to the calculated work current, select the appropriate leakage protector.Butt welding machine is also called current welder or resistance touch welder. By using the resistance between the two workpieces' contact surfaces, the contact surfaces of two mutually butted metal can be instantly heated, melted and fused instantaneously through a low voltage and high current.Simple to use welding machine and welding machine with similar method, welding transformer power supply special features, when the special transformer is in butt welding working resistance is very small, the amount of current limit, to ensure the normal welding current.Silicon controlled rectifier has been applied to the welding machine. New control methods have been produced, mainly for the more accurate current control and more reliable welding quality, but the basic principle and the calculation method of current are the same.
