02900295| Datasheet

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Equation Overview Equation Overview
Equation no. Page

I = KV
1 I V K a

a>1
24

Current through varistor Voltage across varistor Ceramic constant (depending on varistor type) Nonlinearity exponent (measure of nonlinearity of curve)

2 3 4 5 6 7 8 9 10 11 12

1 1 a V V R = -- = ------------ = -- V a K I K V log I = log K + a log V 1 log R = log -- + ( 1 a ) log V K log I 2 log I1 a = ---------------------------------log V 2 log V 1

24 24 24 24 29 33 44 50 50 50 53 L R Cu R SIOV [H] [W] [W] Inductance Coil resistance SIOV resistance at operating current

W =

v(t)i (t )d t
3

TC < 0,5 10 /K = 0,05% /K = 1%/ D 20 K Z SIOV vSIOV = ------------------------------------ v Z source + Z SIOV
i*

i max

W * W max P * P max

V s VSIOV i * = -------------------------Z source L t ------------------------------- [ s ] R Cu + R SIOV i*d t t * r = ------------i^* t 37 % t ln 0, 37 0, 994 -------- = ----------------- = ------------------ = 1,43 = --t 50 % Tr ln 0, 50 0, 693 ^ v* [V] ^ ^ ^ [J] i* [A] W * = v * i* t *r [s] t^*r W * = 1/2 L i*2 [J] L [H] i* [A] Wmax = v max imax tr max
290 04/02

16 17 18

55 56 56