44090_16Kap_Kennlinienpr.qxd 07.02.

2008 10:16 Uhr Seite 196

Software Tool –
Moeller CurveSelect

Tripping diagram
Tripping time

Tripping current [A]

Circuit-breakers are generally the most important switching and protective devices
in electrical power distribution. At the critical nodes of a distribution system,
on which may depend the power supply to entire factories or municipal areas,
fuse-less protection using circuit-breakers with their short recovery time is of
central importance. Selective protection can be designed for various levels within
the network as a preventive measure to ensure a high level of accessibility to
systems and processes. Selectivity ensures that only the protective device closest
to the affected operating medium trips in the event of a fault.

196
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44090_16Kap_Kennlinienpr.qxd 07.02.2008 10:16 Uhr Seite 197

www.moeller.net/curves
S5 S4 S3
250A 1000A 2000A
Moeller CurveSelect – 2h
100
The characteristics program waarree
SSooffttw S1 Hochspannung
40

idee
High voltage
inssid

Minuten
for protective devices in 10

Tripping diagram
1
40
S2 Niederspannung
Low voltage

Sekunden
10
A
4 S3
Tripping time

S3 1 S4
400
B
S5
tv
100

Milli-Sekunden
50ms
S4 40
50ms
Tripping current [A] C
10
4
S5
Reliably and safely controlling, D 1
switching and managing power. In
industry, in buildings and in machine 100 200 400 1000 2000 4000 10000 20000
construction. Innovative protection ICC
concepts. With built-in diagnostics and
[A]
communication functions. Housed in
modern switchgear installations.

In many networks, several protective devices are arranged in Included in the booklet is a CD-ROM with the necessary Excel
series within the current path. The diagram at top right shows file and further information. The file is also downloadable free
an example of a network with time-selectivity using short- of charge from the Moeller website. Since the Microsoft
time delayed circuit-breakers. The new “Moeller CurveSelect” Office Excel® program is used for representation of the
software tool enables all the characteristic curves to be easily tripping characteristics and individual switch settings, it is
represented at the same time, thus allowing assessment of necessary for this program to be already installed on the
the particularly important matter of overload selectivity. computer. No software installation is necessary for the
This new software tool is available from Moeller free of tripping characteristics program, therefore the tool can
charge. It consists of a booklet that explains the setting be used without the requirement for administrator rights
options for protective elements, selectivity itself and how to the computer.
to apply the tool.

Start of the
electrodynamic Characteristic
range limit at Icu

Characteristic Curves Software Tool

300 400 500 700 1k 1,2k 1,5k 2k 2,5k 3k 4k 5k 7k 10k 12k 15k 20k 25k 30k 40k 50k 70k 100k

Tripping current [A]

Due to the complexity of the electro- program, a vertical broken line for the the Moeller Main Catalogue must be
dynamic properties of the current- response value of the instantaneous consulted as well. The values therein
limiting contacts and the arc-quenching overload trip represents the electro- are verified by testing.
apparatus, short-circuit tripping times dynamic limit. Where selectivity for
can not be calculated using this simple the short-circuit range is a matter for
tool. In the characteristic curves of this consideration, the selectivity tables in

197
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44090_16Kap_Kennlinienpr.qxd 07.02.2008 10:16 Uhr Seite 198

The diagram shows the possibilities of

a b c influencing the properties of the curve.
Not all of the above mentioned options
are available for every protective
t Ir element. To find the equipment available
on individual elements it is necessary to
consult the Main Catalogue. These details
are also shown in the input masks of the
tr software tool.

Degrees of freedom in a Non-trip range

Isd b Overload range
c Short-circuit range

tsd
Ii
I

The example shows a representation of Tripping diagram

several characteristic curves sharing the
same scale in terms of current and time.
The individual switch settings input in General specifications:
Company: Moeller GmbH Bonn
Installation: NSV Selektiv
the program are also taken into account. ZB NZM IZM
Editor: Max Mustermann
Date: 13.11.2006
The curves for the different groups of Line: 415 V / 50 Hz

protective elements are shown in

Tripping time

different colours. It is possible to input

identification for individual protective Freely configurable
characteristic
elements thus creating valuable FAZ Fuse
documentation, for example, concerning
the supply status of a new switchgear Freely configurable PKZ(M)
system. The finished chart can then be motor characteristic
copied into other documents as well.

Tripping current [A]

Tripping diagram Motor starting characteristics:

2h
Mot
50kW
p=4
LS
NZMN2 -
ME140
As a further option “CurveSelect” pro-
1h In = 90,9A
Ir = 81,8A
cosφ = 0,852
η = 93,2%
In = 140A
Ir = 0,6 x In
tr = 20s
Ii = 12 x Ir Moeller CurveSelect V1.072
vides the representation of the motor
20min
General specifications: starting characteristics of three-phase
10min
Company: Moeller GmbH Bonn
5min
Installation: Motor starting characteristic asynchronous motors in order to sim-
Editor: Max Mustermann

2min
Date:
Line:
07.12.2007
400 V / 50 Hz
plify and verify the selection of overload
1min
relays / motor-protective circuit-break-
20s
ers. The envelope of the starting current
Tripping time

10s

5s
relative to the effective value is repre-
2s
sented taking the maximum expected
1s
inrush current into consideration. After
500ms

entering factors such as the motor rat-

200ms

100ms ing, number of poles, the expected

50ms
start-up time as well as the average
20ms

10ms
capacity utilization in rated operation,
5ms an initial approximation based on inter-
2ms nal data from commercially available
1ms
1 1,2 1,5 2 2,5 3 4 5 7 10 12 15 20 25 30 40 50 70 100120 150 200 250 300 400 500 700 1k 1,2k 1,5k 2k 2,5k 3k 4k 5k 7k 10k 12k 15k 20k 25k 30k 40k 50k 70k 100k standard motors is generated. This
Moeller does not accept any responsibility for the correctness of the
information. Liability is excluded with the exception of wilful intent
Tripping current [A] allows a preliminary selection of the
motor protective device even when the
exact motor data is still unknown.
198
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44090_16Kap_Kennlinienpr.qxd 07.02.2008 10:16 Uhr Seite 199

Why separate tripping curves? They allow selection of differing delay Consider the tolerances of the curves
times, tr or tsd, in addition to the current which are ± 20 % in the overload range.
Simple protective elements such as settings. As a result of inputting the At any points of contact or intersection
fuses or miniature circuit-breakers have individual data, the tool produces a of the curves, the limit of overload
fixed tripping curves (characteristics), set of curves. These must of course selectivity between the chosen devices
i.e. they cannot be altered. be adjusted to conform as closely as is reached or exceeded.
possible to the operating medium to
On motor-protective relays or circuit- be protected. The user often does not realise what
breakers and on circuit-breakers , effect the settings on the switch may
the setting current Ir of the overload A small setting aid have or where to find information
release and in some cases also the regarding the parameters to be set.
setting current Ii of the instantaneous Several pages in the booklet show the The booklet contains fold out pages
short-circuit release are adjustable. setting errors to be avoided. For example, that explain these relationships.
to ensure selectivity in the overload
Circuit-breakers NZM and IZM with area, the curves in the diagrams of the
electronic releases offer the most circuit-breakers must neither touch nor
flexible options of adaptation to various intersect with one another nor with the
operating media and operational fuse characteristics.
situations.

www.moeller.net/curves
The booklet illustrates
problematic curves and
Example: Several protective devices
explains how to achieve before optimization
selectivity between
protective elements.
Tripping diagram
F2 F1 Q2 Q1
2h gl gl NZMN3 - IZMB1 -
80A 100A VE630 U1600
1h In = 630A In = 1600A
Ir = 1 x In Ir = 1 x In
tr = 2s tr = 8s (I≤t)
Isd = 2 x Ir Isd = 3 x In

20min
tsd = 0ms
I≤t = On
tsd = 100ms
I≤t =On
Allgemeine
General Angaben:
specifications:
Ii = 8 x In Ii = 12 x In
Firma: Moeller
Company: Moeller GmbH
10min
Anlage: 1 1
Installation:
5min Bearb.:
Editor:Mey
Mey
Date:13.07.2004
Datum: 13.07.2004
2min Line:400V
Netz: 400V / 50Hz
/ 50Hz

1min

www.moeller.net/curves
Tripping time

20s

10s

5s

2s

1s

Setting aid for NZM circuit-breakers in IEC version 500ms

– Type dependent rating and setting values – 200ms

100ms

Position Value Value range Factory Setting With type Influence on tripping Source for setting value Possible faults
default 50ms
in figure setting type characteristic
20ms Non-selective
Observe the preset ➡ Caution ! 10ms range
scaling (stages) !
➡ Dangerous !!!
5ms

In= Iu Refer to the rating label of the All No influence, Max. required current for
Caution!
Switch over- 2ms

circuit-breaker, construction-related, limit value for the switch the application dimensioned or 1ms

non-adjustable rated value selection Selectivity problems inunder-dimensioned 10 12 15 20 25 30 40 50

Für die Richtigkeit übernimmt Moeller keine Gewähr.
70 100 120 150 200 250 300 400 500 700 1k 1,2k 1,5k

Tripping current [A]

2k 2,5k 3k 4k 5k 7k 10k 12k 15k 20k 25k 30k 40k 50k 70k 100k

Die Haftung ist insoweit mit Ausnahme in Fällen des

thee.g.
fuse overload range Vorsatzes ausgeschlossen.

1 Ir 0.5-1 x In 0.8 x In Step All, except Offsets the upper starting motor current or Early or
switch switch point of the curve to the right permissible cable loading late trip
without Ir of the switch
14
2 tr 2-20 s and ∞ 10 s Step NZM2..4 -
Tripping time is defined for Permissible (necessary) Early or
(∞ = without switch 6 x Ir. If the curve is offset
ME and -VE runup time of the motor late trip
overload upwards, the tripping time is of the switch
release) extended, premature tripping
is avoided, the tripping time partly over-dimensioning
may not be continuously of switchgear and
extended. Take the thermal cables is necessary,
loading of the equipment
and the entire circuit into Observe the table with
www.moeller.net/curves
consideration max. permissible tripping
class in the main catalogue!

3 Isd 2-10 x Ir 6 x Ir t Step NZM2..4 -VE Trips when the set short- With time selectivity: Lack of selectivity due to time
Small setting aid switch
Tripping characteristic
circuit current is reached
after the set delay time
lowest network level
without delay (e.g. PKZM),
with each successive level
stages which are too low.

tsd 0 –1000 ms 0 ms Step having a delay setting

– notes for avoiding faults – 4
switch one step greater than
the previous level
1

www.moeller.net/curves

2 19

0,8 6 6 0.6
Setting aid for NZM circuit-breakers in IEC version
0,7 0,9
4
5 7
8 4
5 7
8 0.4
0.5 0.7
0.8
– Type dependent rating and setting values –
0,6 0,95 1 3 9
3 3 10
5 0.9
7 3
Characteristic Curves Software Tool
9 0,5 1,0 2 10 2 12
0.3
1.0
Position Value Value range Factory Setting With type Influence on tripping Source for setting value Possible faults
Ir/n x In Isd/n x Ir Ii/n x In Ig/n x In
6 default
8
10
100
200 on 100
200 in figure setting type characteristic
14 300 300
6 17 60 500 60 500

4 5 Observe the preset ➡ Caution !

10 4 20
2 20 750
4 off 6 20 750
8
1000 1000 scaling (stages) !
2
tr/s(6 x Ir)
0
tsd/ms I2t
0
tg/ms ➡ Dangerous !!!
I I 2-14 x In or not 12 x In Step All Must protect the weakest Setting dependent on Setpoint motor startup
5 i
Note: Not all parameters are available or adjustable on simpler adjustable switch element in the circuit against the incoming supply current may not lead
Z2 protective devices. destruction (emergency brake) short-circuit rating and to a trip.
The figure indicates the influence of the permissible peak currents.
adjustable parameters. Observe the necessary If setting is too high,
neutralization (IEC 60364) switch does not trip

2 on / off off on / off NZM3..4 -VE The tripping time is increased, Selectivity consideration Missing selectivity
Adjustable parameters: 6 It in dependence on the max. with the following fuse
2
with fuses
permissible I t value of the
switch
1 overload release Ir 6 I2t-setting On/Off
2 time delay setting to overcome current peaks tr 7 earth-fault protection Ig (optional) 7 Ig 0.3-1 x Iu Step Optional with: No influence Situation related, Too sensitive,
switch NZM3..4 - reasonable values to faulty trips,
3 delayed short-circuit release Isd 8 earth-fault release delay time tg AE,-ME, -VE be estimated for fire no selectivity,
4 delay time tsd (relative to Isd) 9 LED overload warning with Ir 70 / 100 / 120% protection, time staging
8 tg 0-1000 ms Step enables earth-fault with danger of fire
5 non-delayed short-circuit release Ii 10 data interface switch selectivity is setting too high

9 Overload message “Alarm” LED (at 70 % of Ir NZM2..4 - No influence – Early warning of

continuous light, from 100 % slow flash and AE,-ME, -VE trip not observed
18 from 120 % fast flash)

10
Data interface for laptop or data management NZM2..4 - Enables supplementary See above notes for See above,
interface DMI AE,-ME, -VE parametric programming parametric values Notes about
parametric values
Fundamental representation using NZM4 example, details and value ranges may deviate in individual cases.
See valid main catalogue. Observe the peculiarities with 4-pole switches and IT electrical power networks.

A small setting aid illustrates the effects of 20

any changes to the settings and explains

the guiding values to be followed for a
selectivity setting.

www.moeller.net/curves

199
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 Content Page

Command and signalling devices RMQ-Titan,

RMQ16, Fingerprint system M22-ESA 8 - 27

Position switch LS-Titan, AT...

28 - 39

Rotary switches T and switch-disconnectors P

40 - 51

Insulated enclosure CI-K

52 - 55

Function relays –
timing, safety, operating, measuring and monitoring relays 56 - 67

Easy control relay, multi-function-display MFD-Titan, safety-related

control relay easySafety, easyControl EC4P 68 - 91

Power supplies SN
92 - 93

Frequency inverters DF/DV

94 - 97

Semiconductor contactors DS
Soft starter DS and DM 98 - 105

Contactors DIL
Auxiliary switches DIL, Overload relays Z 106 - 125

Motor-protective circuit-breakers PKZ

126 - 139

Motor-starter combinations
140 - 151

Decentral Motor Starter and Speed Controller

Rapid Link 152 - 153

Circuit-breakers and switch-disconnectors NZM/IZM

154 - 189

Switchgear systems xEnergy

190 - 195

Characteristics program
196 - 199

Miniature circuit-breakers FAZ

Residual-current circuit-breakers, Combined RCD/MCB switches,
Surge arresters, Rail-mounted service installation devices 200 - 207

Transformers and line reactors

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Safety technology
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Label editor
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Approvals
232 - 235

Services/Addresses
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