Ingeniero

www.moeller.net

Setting-Specific Representation of Tripping Characteristics and Competent Assessment of their Interaction
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Tripping diagram

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General specifications:
Installation:NSV Selektiv Editor: Max Mustermann Date: 13.11.2006 Line: 415 V / 50 HzZB

FA FAZ

NZM

IZM
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Tripping time

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FAZ

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Motor characteristic

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Tripping current [A]

Technical Paper

Dipl.-Ing. Wolfgang Esser Dipl.-Ing. Dirk Meyer
3rd Revised Edition,2009

Brief summary

Setting-specific representation of tripping characteristics and competent assessment of their interaction
– Explanations regarding the Moeller “CurveSelect” software tool –

If several protective devices are to interact effectively in a switchgear system, it is necessary to compare their tripping characteristics in order to evaluate their selectivity for the demands ofenhanced system availability. It is important to use characteristic curves which take the actual individual settings on the protective devices into account for all tests. This is practically impossible with printed characteristic representations in catalogues. In this technical paper the device-specific setting features of different protective devices are presented and assigned to the varioustypes of electrical equipment. The Moeller “CurveSelect” software tool enables a simple common representation of the curves on multiple protective devices on the same time and current scales for very little effort.

This significantly simplifies the representation of the curves. The tool enables assessment of the Moeller circuit-breakers NZM and IZM, the motor-protective circuit-breaker PKZM, theminiature circuit-breaker FAZ (tripping characteristic B, C and D), the overload relay ZB and fuse types gL or gG. The characteristics of older switch generations are also shown with circuitbreakers to enable planning of possible expansions. New since Version 1.071 is the freely definable representation of motor runup characteristics, in order to determine if the selected motor protection deviceenables malfunction-free run-up of a three-phase asynchronous motor. As it may be necessary to verify the interaction of non-Moeller products (e.g. medium-voltage protection devices or

protection devices from competitors), the program now offers a feature which allows the user to freely self-define characteristic curves. The additional features considerably add to the value software tool that canbe used with 11 user languages. The handling of the 11 selectable languages can be found in the program Read_Me file that allows the entry mask and the representation of the results to be displayed in the chosen language. Moeller provides this helpful tool on the internet and on a CD free of charge (Figure 1). The user is guided through the data entry phase by the provision of permissible...