![background image](http://html1.mh-extra.com/html/huazheng/hzg/hzg_manual_2179956011.webp)
8
I. Product Overview
This series of control boxes are designed and manufactured according to the unique
usage range of high voltage test transformers. Their functions are as follows:
A. Overcurrent protection
B. Timing sound and light alarm;
C. Direct reading of high voltage voltage;
D. Free Setting of Voltage Test Time (Digital Display)
E. Mobile structure (desktop)
II. Working Principle
This series of control boxes are composed of contact voltage regulator (more than
50KA is electric column voltage regulator) and its control, protection, measurement and
signal circuits. It adjusts the voltage regulator (i.e. the input voltage of the test transformer)
by connecting 220V or 380V power frequency power supply to obtain the required test
high voltage voltage value. Its working principle is shown in Fig. 1:
Figure 1: Working Principle of Control Box
BH-Current transformer
Α
-Ammeter
KV -High Voltage Display Meter
T-Voltage regulator