求翻译：MJN3型变压器有载调压电源的电气主电路如图3所示。控制单元使用的是MCT801D模块，输出信号经过隔离放大，驱动S1～S4双向晶闸管，控制变压器分接头的切换，完成有载调压。是什么意思？

MJN3 transformer on-load tap main electrical power supply circuit shown in Figure 3. Control unit using MCT801D module, the output signal through the isolation amplifier, bidirectional thyristor S1 ~ S4 drive, control transformer tap switch, complete the on-load tap.

3 MJN transformer-voltage electrical main circuit as shown in figure 3. control module is used by 801 MCT D module, the output signal after isolation amplifier, driver S 1~ S 4 two-way Thyristor, control transformer sub-connections, completed the switch-carrier.

The MJN3 transformer has carries adjusts the piezoelectricity source electrical main circuit as shown in Figure 3.The control unit use is the MCT801D module, the output signal enlarges after the isolation, actuates the S1~S4 bidirectional thyristor, controls the transformer tapping the cut, complete

MJN3 transformer on-load voltage regulating power of main electric circuit as shown in Figure 3. Control unit using a MCT801D module, the output signal after isolation amplifier, driving S1~S4 bi-directional thyristor control transformer tap switch, complete tap.

The Model MJN3 voltage transformer has year to adjust the electric main circuit to press power and is shown as in Fig. 3. What the control unit used is MCT801D module, outputting signals is isolated the amplification, drive S1-S4 two-way brilliant floodgate to manage, control voltage transformer div