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3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
135
Parameter assignment/addressing
10
10.1
Setting the parameters
Settings on the ETU
The values to be set on the electronic trip unit of the circuit breaker depend on the technical
environment (switching station, cables), the network configuration, and the type of equipment
to be protected. There is no rule of thumb for protection settings. These values can be
calculated by the relevant electrical planning engineer.
The Siemens software tool SIMARIS Design (www.siemens.com/simaris) offers a simple,
quick and safe solution for dimensioning switching and protecting devices.
Tripping characteristic curve and settings parameters
The current-time curve of a trip unit offers the best method for detecting the tripping
characteristics of a trip unit. The tripping characteristic curve reflects the behavior of the
circuit breaker in the event of a fault, e.g. overload or short-circuit. The time required to trip is
defined at a specific current. The tripping characteristic curve is divided into different
sections. Each section reflects the tripping behavior of the circuit breaker at a specific current
level Depending on the type, the trip units can be supplied with or without the S, N, or G
functions (L, S, I, N, G designations in accordance with IEC60947-2, Annex K).
●
L long time delay = overload protection with current-dependent long time delay and
current-dependent tripping curve (I
2
t = constant)
●
L short time delay = short-circuit protection with current-dependent or current-
independent short time delay and current-dependent tripping curve (I
2
t
sd
= constant)
●
I Instantaneous = short-circuit protection with instantaneous adjustable tripping.
●
N Neutral protection = protection of the neutral conductor with adjustable, current-
dependent tripping curve.
●
G Ground fault = ground fault protection with current-independent short time delay
Содержание SENTRON 3VL series
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Страница 10: ...Table of contents 3VL molded case circuit breakers 10 System Manual 03 2009 110 0110 02 DS 01 ...
Страница 40: ...System overview 4 2 Key data 3VL molded case circuit breakers 40 System Manual 03 2009 110 0110 02 DS 01 ...
Страница 350: ...Correction sheet 3VL molded case circuit breakers 350 System Manual 03 2009 110 0110 02 DS 01 ...
Страница 358: ...Glossary 3VL molded case circuit breakers 358 System Manual 03 2009 110 0110 02 DS 01 ...
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