Moreover, three-phase four-wire active filters can suppresszero line current, and solve symmetric problem of system effectively.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
2
Set this constant to a non-zero value to enable diagnostic messages to be printed or set it to zero to suppress them.
将这个常量设置为非零值，以便显示诊断消息；或者将其设置为零，以便抑制诊断消息。
3
Just before the voltage source is turned on, disable the meter's zero check and suppress the charge reading by using the REL function to zero the display.