1. b.alinezhad@yahoo.com-09123120634 All rights reserved Surge Arrester

2. b.alinezhad@yahoo.com-09123120634 All rights reserved STANDARDS IEC 60099 Surge arresters — Part 1 : Non-linear resistor type gapped surge arresters for a.c. systems Part 4 : Metal-oxide surge arresters without gaps for a.c. systems Part 5 : Selection and application recommendations

3. b.alinezhad@yahoo.com-09123120634 All rights reserved Definition ‘‘A protective device for limiting surge voltages on equipment by diverting surge current and returning the device to its original status. It is capable of repeating these functions as specified.’’ [IEEE Standard C.62.11-2005]

4. b.alinezhad@yahoo.com-09123120634 All rights reserved Metal-Oxide Arresters

5. b.alinezhad@yahoo.com-09123120634 All rights reserved U-I-characteristic of a typical MO arrester in a solidly earthed neutral 420kV system

6. b.alinezhad@yahoo.com-09123120634 All rights reserved Metal-Oxide Resistors

7. b.alinezhad@yahoo.com-09123120634 All rights reserved Porcelain Housed Surge Arrester

8. b.alinezhad@yahoo.com-09123120634 All rights reserved Polymer Housed Surge Arrester

9. b.alinezhad@yahoo.com-09123120634 All rights reserved Two-Unit HV Surge Arrester Components

10. b.alinezhad@yahoo.com-09123120634 All rights reserved Surge Counter

11. b.alinezhad@yahoo.com-09123120634 All rights reserved Surge Counter Installation

12. b.alinezhad@yahoo.com-09123120634 All rights reserved Surge Arrester Calculation

13. b.alinezhad@yahoo.com-09123120634 All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

14. b.alinezhad@yahoo.com-09123120634 All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

15. b.alinezhad@yahoo.com-09123120634 All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

16. b.alinezhad@yahoo.com-09123120634 All rights reserved  Selecting the Nominal Discharge Current IEC 60099-4 Table 1

17. b.alinezhad@yahoo.com-09123120634 All rights reserved  Selecting the Line Discharge Class IEC 60099-5 Table 1

18. b.alinezhad@yahoo.com-09123120634 All rights reserved  Energy Absorption Capability due to Switching IEC 60099-5 Table 1

19. b.alinezhad@yahoo.com-09123120634 All rights reserved Specific energy in kJ/kV of rated voltage dependent on the ratio of switching impulse residual voltage U a to the r.m.s. value of the rated voltage U r the arrester. [Fig. E1 IEC 60099-4]

20. b.alinezhad@yahoo.com-09123120634 All rights reserved  Energy Absorption Capability due to Lightning [IEC 60099-5 ]

21. b.alinezhad@yahoo.com-09123120634 All rights reserved  Selecting the Housing [IEC 60099-4] 1.Insulation Characteristics 2.Mechanical Characteristics 3.Creepage distance

22. b.alinezhad@yahoo.com-09123120634 All rights reserved  Selecting pressure relief class Porcelain housed arrester after pressure relief test

23. b.alinezhad@yahoo.com-09123120634 All rights reserved Surge Arrester Calculation  Protecting Distance [IEC 60099-5 ] U rw : Rated lightning impulse withstand voltage U pl :Lightning impulse protection level of surge arrester L f = R a /r : Length of overhead line in front of the station, which gives a rate of lighting events equal to the acceptable failure rate R a : Acceptable failure rate (number of failures per unit time) for the protected equipment (1/Year) r : Overhead line outage rate (1/100km.Year) N : Number of lines connected to the substation L sp : Span length L p : Protecting distance A : Voltage according to Table2 of IEC60099-5 describing the lighting performance of the overhead line connected to the station

24. b.alinezhad@yahoo.com-09123120634 All rights reserved  Protecting Distance [IEC 60099-5 ] IEC 60099-5 Table 2 : Factor A for various over head lines

25. b.alinezhad@yahoo.com-09123120634 All rights reserved  Protecting Distance [Ministry of Power Standard] U p : voltage on the terminal of the protected equipment L : Inductance Of The Conductor Between Line And Effective Earth L c : Maximum Length From Line Conductor To Effective Earth S : Front Steepness Of Lightning Overvoltage (kV/µS)

26. b.alinezhad@yahoo.com-09123120634 All rights reserved Catalogue (TRIDELTA)

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