TOV Test System （MV & HV） for SPD

1. The high voltage parts of the device is grounded and isolated;
2. The control cabinet is grounded and the test circuit always grounded at one end;
3. High voltage indicator of red light hints the high voltage is working and green light hints there is no high voltage danger.
4. When the scramming button is pressed, the high voltage device is cut off and terminal grounding of high voltage discharge.
5. When the protection door or scramming switch of test area is opened, high voltage discharges to the ground and the device is not in operation. The interlock light is open.
6. The main loop of the equipment has a fuse for the over current protection to ensure safety.
7. It is equipped with manual grounding rod.

The TOV test system is mainly used for SPD TOV test caused by the faults in the medium and high voltage system.

• Input power supply:3 phase, 4 line, larger than 650kVA;
• With a separate earthing point, the earthing resistance is less than 3 Ohm;
• The TOV test system must be installed in the first floor;
• Maximum open circuit voltage:1200V(Tolerance:-5% ~0%);
• Maximum short circuit current:300A (Tolerance:0% ~10%);

IEC61643-11 surge protective devices-Part 11: surge protective devices connected to low-voltage power systems-requirements and test methods