Surge Arrester b alinezhadyahoo com09123120634 All rights reserved

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Specific energy in k. J/k. V of rated voltage dependent on the ratio of switching impulse residual voltage Ua to the r. m. s. value of the rated voltage Ur the arrester. [Fig. E 1 IEC 60099 -4] b. alinezhad@yahoo. com-09123120634 All rights reserved

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

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

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

Surge Arrester Calculation Ø Protecting Distance [IEC 60099 -5 ] Urw : Rated lightning impulse withstand voltage Upl : Lightning impulse protection level of surge arrester Lf = Ra/r : Length of overhead line in front of the station, which gives a rate of lighting events equal to the acceptable failure rate Ra : Acceptable failure rate (number of failures per unit time) for the protected equipment (1/Year) r: Overhead line outage rate (1/100 km. Year) N: Number of lines connected to the substation Lsp: Span length Lp : Protecting distance A: Voltage according to Table 2 of IEC 60099 -5 describing the lighting performance of the overhead line connected to the station b. alinezhad@yahoo. com-09123120634 All rights reserved

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

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

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

b. alinezhad@yahoo. com-09123120634 All rights reserved

b. alinezhad@yahoo. com-09123120634 All rights reserved

b. alinezhad@yahoo. com-09123120634 All rights reserved

b. alinezhad@yahoo. com-09123120634 All rights reserved

b. alinezhad@yahoo. com-09123120634 All rights reserved