All rights reserved Surge Arrester.

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Presentation transcript:

All rights reserved Surge Arrester

All rights reserved STANDARDS IEC 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

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 ]

All rights reserved Metal-Oxide Arresters

All rights reserved U-I-characteristic of a typical MO arrester in a solidly earthed neutral 420kV system

All rights reserved Metal-Oxide Resistors

All rights reserved Porcelain Housed Surge Arrester

All rights reserved Polymer Housed Surge Arrester

All rights reserved Two-Unit HV Surge Arrester Components

All rights reserved Surge Counter

All rights reserved Surge Counter Installation

All rights reserved Surge Arrester Calculation

All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

All rights reserved  Choosing the Continuous Operating Voltage and the Rated Voltage

All rights reserved  Selecting the Nominal Discharge Current IEC Table 1

All rights reserved  Selecting the Line Discharge Class IEC Table 1

All rights reserved  Energy Absorption Capability due to Switching IEC Table 1

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 ]

All rights reserved  Energy Absorption Capability due to Lightning [IEC ]

All rights reserved  Selecting the Housing [IEC ] 1.Insulation Characteristics 2.Mechanical Characteristics 3.Creepage distance

All rights reserved  Selecting pressure relief class Porcelain housed arrester after pressure relief test

All rights reserved Surge Arrester Calculation  Protecting Distance [IEC ] 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 IEC describing the lighting performance of the overhead line connected to the station

All rights reserved  Protecting Distance [IEC ] IEC Table 2 : Factor A for various over head lines

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)

All rights reserved Catalogue (TRIDELTA)

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