SIOV Metal Oxide Varistors - DEMAR

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Application and Design Examples 3.7 Combined circuits 3.7.1 Stepped protection If transient problems cannot be resolved with a single component like a varistor, it is always possible to combine different components and utilize their respective advantages. As an example, figure 40 illustrates the principle of stepped protection of a telemetering line with a gas-filled surge arrester [1], a varistor and a suppressor diode*): The voltage of 10 kV is limited in three stages ● “coarse” surge arrester ● “standard” varistor ● “fine” suppressor diode, zener diode or filter [2] to less than 50 V. The series inductors or resistors are necessary to decouple the voltage stages. For more details refer to Siemens publication [3]. Note According to the specifications in [1] gas-filled surge arresters may not be used on low-impedance supply lines. A PROTECTOR TESTER is available to test the function state of the above-mentioned protection components. This can be ordered using ordering code B84298-P1-A1. 3.7.2 Protective modules Application-specific circuits for stepped protection assembled as modules, some incorporating overload protection and remote signaling, are available on the market. Figures 41 a and b show some practical examples. [1] Shortform catalog “Gas-Filled Surge Arresters”, ordering no. B448-P4806-X-X-7400 [2] Data book “EMC Components”, ordering no. B424-P2414-X-X-7600 [3] Pigler, Franz “EMV und Blitzschutz leittechnischer Anlagen” (only available in German), ordering no. A19100-L531-F503, ISBN 3-8009-1565-0 *) Not in the S+M range 76 Siemens Matsushita Components
Application and Design Examples FRAME4/home/SMC-Archiv-DB/GG-KB-engl/DB-<strong>SIOV</strong>_97_BNR-B462-P6214-X-X-7600/R-Beispiele * ) or R Figure 40 Principle of stepped protection with surge arrester, varistor and suppressor diode 41a Surge voltage wave Cable Ground or neutral Figures 41a and b Series impedance Surge arrester Unit Gas arrester Varistor Z diode 41b Cable Ground or neutral Varistor Supressor diode Examples of transient protective modules a) Circuit with coarse protection plus fine transverse voltage protection b) Circuit with coarse protection plus fine longitudinal voltage and transverse voltage protection Unit Protected unit Siemens Matsushita Components 77
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SIOV Metal Oxide Varistors
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SIOV Metal Oxide Varistors - DEMAR

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