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1. Through over voltage on - line monitoring device testing , inquire into lightning protection of the reactor air core.

2. Especially , it is very important for studying over voltage of EHV and UHV transmission line.

3. It's equipped with low battery shutdown over voltage over heating, over loading and short circuit protection.

4. Acquired with mature indicating functions and over voltage protection, over flow protective apparatus, safety and reliable.

5. Under current, over voltage, overload protection function, DSS, quasi - resonant mode, jitter period principal were all analyzed.

6. There are two ways to emerge instantaneous over voltage in the side of low voltage which are thunderstruck and instantaneous process of electronic network.

7. The over Voltage protection should be tested at other load rating.

8. The circuits of protecting arc welding inverter from over voltage and over current is also introduced.

9. As a result service interruption involving temporary over voltage must be limited.

10. The ways of cancelling over voltage are setting up deceleration time, consumption of energy, feedback electric network brake and shared direct current bus bar soaking regenerated energy.

11. Through over voltage on-line monitoring device testing, inquire into lightning protection of the reactor with air core.

12. To make the over voltage Vs time function of line trap at short time current test by complex frequency field analysis is introduced in this paper.

13. WJJL1 intelligence over current relay is a typical electronic apparatus which has over current, short circuit, over voltage, under curent, phase faults and starting failure protective functions.

14. The interrupt service routine realizes real-time response and disposal of over current, over heat, over voltage and low voltage trouble in welding process.

15. The power source protection circuit that can implement instantaneous over voltage, coinstantaneous over voltage, over current protection was introduced.

16. Three tower models that is lumped inductance model, single surge impedance model and multi-surge impedance model are built, and the effect of tower model on lightning over voltage has been studied.

17. In a certain electric grid conditions, multiple re- ignitions and severe over voltage may be generated at the time when breaking high frequency current.

18. Power control Box supply stable voltage and current overload, over voltage protected.

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19. Also introduction of characters of main electrical device applied in operating over voltage surge suppression.

20. The ARD has perfect performance on short circuit, Over current and over voltage protections.

21. The major function of variators of ZnO is to detect and suppress surge voltage and over voltage without destroying themselves.