bsen62305-1-20xxprotectionagainstlightning—part1generalprinciples

bsen62305-1-20xxprotectionagainstlightning—part1generalprinciples内容摘要：

(source of damage S3) ......................... 65 Surges due to flashes near the services (Source of damage S4)............... 66 Surges due to induction effects (Source of damage S1 or S2) .............................. 66 Surges inside an unshielded LPZ 1 .......................................................... 66 Surges inside shielded LPZs .................................................................... 66 General information relating to SPDs ................................................................... 66 – 5 – EN 623051:2020 Figure 1 – Types of loss and corresponding risks resulting from different types of damage ........................................................................................................................ ...... 20 Figure 2 – LPZ defined by an LPS (IEC 623053) ............................................................... . 25 Figure 3 – LPZ defined by protection measures against LEMP (IEC 623054) ...................... 26 Figure – Definitions of short stroke parameters (typically T2 2 ms) .............................. 30 Figure – Definitions of long stroke parameters (typically 2 ms Tlong 1 s) .................. 31 Figure – Possible ponents of downward flashes (typical in flat territory and to lower structures) ............................................................................................................. .... 31 Figure – Possible ponents of upward flashes (typical to exposed and/or higher structures) ............................................................................................................ ... 32 Figure – Cumulative frequency distribution of lightning current parameters (lines through 95 % and 5 % value) ............................................................... ............................... 35 Figure – Waveshape of the current rise of the first short stroke ..................................... 39 Figure – Waveshape of the current tail of the first short stroke ...................................... 40 Figure – Waveshape of the current rise of the subsequent short strokes ....................... 41 Figure – Waveshape of the current tail of the subsequent short strokes......................... 42 Figure – Amplitude density of the lightning current according to LPL I ........................... 43 Figure – Example test generator for the simulation of the specific energy of the first short stroke and the charge of the long stroke .............................................................. 45 Figure – Definition for the current steepness in accordance with Table ................... 46 Figure – Example test generator for the simulation of the front steepness of the first short stroke for large test items ................................................................................... . 47 Figure – Example test generator for the simulation of the front steepness of the subsequent short strokes for large test items ...................................................................... 47 Figure – General arrangement of two conductors for the calculation of electrodynamic force ......................................................................................................... . 55 Figure – Typical conductor arrangement in an LPS ....................................................... 55 Figure – Diagram of the stresses for the configuration of Figure ............................. 56 Figure – Force per unit length along the horizontal conductor of Figure .................. 56 Table 1 – Effects of lightning on typical structures ............................................................... 15 Table 2 – Effects of lightning on typical services ................................................................. 17 Table 3 – Damages and loss in a structure according to different points of strike of lightning ..................................................................................................................... ........ 19 Table 4 – Damages and loss in a service according to different points of strike of lightning ..................................................................................................................... ........ 19 Table 5 – Maximum values of lightning parameters according to LPL................................... 24 Table 6 – Minimum values of lightning parameters and related rolling sphere radius corresponding to LPL............................................................................................ .............. 27 Table 7 – Probabilities for the limits of the lightning current parameters............................... 27 Table – Tabulated values of lightning current parameters taken from CIGRE (Electra No. 41 or No. 69*) [3], [4] ...................................................................................... . 33 Table – Logarithmic normal distribution of lightning current parameters – Mean μ and dispersion σ log calculated from 95 % and 5 % values from CIGRE (Electra No. 41 or No. 69) [3], [4] ....................................................................................... . 34 EN 623051:2020 – 6 – Table – Parameters for Equation ............................................................................ 38 Table – Test parameters of the first short stroke ........................................................... 45 Table – Test parameters of the long stroke .................................................................. . 45 Table – Test parameters of the short strokes ................................................................ 46 Table – Summary of the lightning threat parameters to be considered in the calculation of the test values for the different LPS ponents and for the different LPL 49 Table – Phys。