EN 60644:1993
(Main)Specification for high-voltage fuse-links for motor circuit applications
Specification for high-voltage fuse-links for motor circuit applications
Applies primarily to fuse-links used with motors started direct-on-line on alternating current systems of 50 Hz and 60 Hz. Standardizes time-current characteristics to formulate additional pulse withstand requirements regarding testing and to give guidance for the selection of fuse-links to be used with motors. Note: -Fuse-links according to this specification should comply with the requirements of EN 60282-1.
Anforderungen an Hochspannungs-Sicherungseinsätze für Motorstromkreise
Spécification relative aux éléments de remplacement à haute tension destinés à des circuits comprenant des moteurs
S'applique principalement aux éléments de remplacement utilisés avec des moteurs à démarrage direct sur des réseaux en courant alternatif à 50 Hz et 60 Hz. Normalise les caractéristiques temps-courant, établit des spécifications d'essais complémentaires concernant la tenue aux impulsions et donne des conseils pour le choix des éléments de remplacement à utiliser avec des moteurs. Note: - Les éléments de remplacement répondant à cette spécification doivent être conformes aux prescriptions de la EN 60282-1.
Specification for high-voltage fuse-links for motor circuit application (IEC 644:1979)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-1995
Specification for high-voltage fuse-links for motor circuit application (IEC
644:1979)
Specification for high-voltage fuse-links for motor circuit applications
Anforderungen an Hochspannungs-Sicherungseinsätze für Motorstromkreise
Spécification relative aux éléments de remplacement à haute tension destinés à des
circuits comprenant des moteurs
Ta slovenski standard je istoveten z: EN 60644:1993
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STAN DARD
First edition
1979-01
Spécification relative
aux éléments de
remplacement à haute tension destinés
à des circuits comprenant des moteurs
Specification for high-voltage fuse-links
for motor circuit applications
© IEC 1979 Droits
de reproduction réservés — Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
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— 3 —
CONTENTS
Page
FOREWORD 5
PREFACE 5
Clause
I. Scope 7
2. Object
7 3. Fuse-link time-current characteristics
4. K Factor 9
5. Withstand requirements 9
6. Withstand tests
1.1 7. Information to be given to the user
Selection of fuse-links for motor circuit applications and correlation of fuse-link characteristics
8.
with those of other components of the circuit
Figures
— 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
SPECIFICATION FOR HIGH-VOLTAGE FUSE-LINKS
FOR MOTOR CIRCUIT APPLICATIONS
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National Committees in that
sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt
the text of the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence
between the I EC recommendation and the corresponding national rules should, as far as possible, be clearly indicated
in the latter.
PREFACE
This standard has been prepared by Sub-Committee 32A, High-voltage fuses, of IEC Technical Committee No. 32, Fuses.
General work concerning the standardization of the time-current characteristics of fuses was decided on at the meeting
held in Tehran in 1969. Several tentative proposals were submitted to Sub-Committee 32A which decided, at its meeting
held in The Hague in 1975, to consider fuse-links for motor circuit applications and those for transformer circuit applications
separately. The first drafts for motor circuit applications were discussed at the meeting held in Moscow in 1977, as a result
of which a final draft, Document 32A(Central Office)44, was submitted to the National Committees for approval under the
Six Months' Rule in November 1977.
The following countries voted explicitly in favour of publication:
Australia Italy Turkey
Belgium Union of Soviet
Netherlands
Canada South Africa (Republic of) Socialist Republics
Egypt Spain United Kingdom
France Sweden United States of America
Germany Switzerland
The Japanese National Committee cast a negative vote to object to the concept of rated current as used in this standard.
It was in favour of a new concept which would result in a rated current of the fuse-link substantially equal to the rated current
of the motor to be protected.
Other IEC publication quoted in this standard:
Publication No. 282-1: High-voltage Fuses. Part 1. Current-limiting Fuses.
— 7 —
SPECIFICATION FOR HIGH-VOLTAGE FUSE-LINKS
FOR MOTOR CIRCUIT APPLICATIONS
I. Scope
This standard applies primarily to fuse-links used with motors started direct-on-line on alternating
current systems of 50 Hz and 60 Hz.
Note. — When motors are used with assisted starting this specification can also be applied but particular attention
should be- paid to the selection of the rated current of the fuse-link (see Sub-clause 8.1) and the manu-
facturer of the fuse-link should preferably be consulted.
Fuse-links according to this specification are intended to withstand normal service conditions
and motor starting pulses. They shall comply with the requirements of I E C Publication 282-1:
High-voltage Fuses. Part 1: Current-limiting Fuses.
2. Object
The object of this standard is to standardize time-current characteristics, to formulate additional
pulse withstand requirements regarding testing and to give guidance regarding the selection of
fuse-links intended to be used with motors.
3. Fuse-link time-current characteristics
Relatively high operating current (slow operation) is desirable in the 10 s region of the pre-arcing
time-current characteristic to give maximum withstand against motor starting current.
Relatively low operating current (fast operation) is desirable in the region below 0.1 s to give
maximum short-circuit protection to associated switching devices, cables and motors and their
terminal boxes.
The pre-arcing time-current characteristics of fuse-links for motor circuit applications shall be
within the following limits:
If10/In> 3 for I < 100 A
f i0/In > 4 for h > 100 A
If0,1/In < 20 (4/100) 025 for all current ratings
where:
In = current rating of the fuse-link
f 10 and I t = pre-arcing currents corresponding to 10 s and 0.1 s respectively expressed as mean values with the
f 0
tolerances specified in Sub-clause 18.9 of IEC Publication 282-1.
The term (In/100)025 is introduced to take account of the fact that the pre-arcing time-current
characteristics for a range of fuse-links diverge as they approach the short-time region.
— 9 —
4. K Factor
Factor which defines an overload characteristic to which the fuse-link may be repeatedly subjected
under specified motor starting conditions, and other specified motor-operating overloads, without
deterioration.
For the purpose of this specification, the value of K is chosen at 10 s. Unless otherwise stated by
the fuse-link manufacturer, it is valid from 5 s to 60 s, for a frequency of starts up to six per hour
and for not more than two consecutive starts. For conditions different from those specified above,
for example where service conditions involve inching, plugging or more frequent starts, the manu-
facturer should be consulted.
The overload characteristic is obtained by multiplying the current on the pre-arcing characteristic
by K (less than unity).
5. Withstand requirements
The performance of a fuse-link for motor circuit applications is in general determined by the
following criteria:
— to withstand without deterioration starting pulses in rapid succession due for example to ab-
normal conditions, such as those occurring during commissioning of the equipment;
— to withstand without deterioration a large number of motor starts in normal service conditions.
This standard therefore specifies two sequences of tests representative of these conditions:
100 cycles corresponding to abnormal service conditions; 2 000 cycles corresponding to normal
service conditions. It is expected that a fuse-link which passes these tests will have a good behaviour
during a satisfactory life duration.
6. Withstand tests
The withstand tests are type tests. Both test sequences shall be carried out on the same fuse-link.
The fuse-link shall be tested under the same test conditions as in Sub-clause 12.1.2 of I E C
Publication 282-1.
for pulses simulating the motor starting pulses and
The values of test currents shall be Kh
110/6 If being the pre-arcing current at 10 s.
KI for periods simulating the normal motor running.
The tolerance on both values shall be -1o°/O
The duration of individual pulses shall be 10 s. The tolerance on the 10 s periods, both pulses
and off periods, shall be +0.5 s.
Tests shall be made at any convenient voltage and at a frequency from 48 Hz to 62 Hz.
6.1 Test sequence No. 1
This test sequence shall comprise 100 cycles of 1 h as follows:
— A current KIf10 for 10 s.
— An off period of 10 s.
— 11 —
— A current Klfla for 10 s.
— A current K1110/6 for 3 560 s.
— An off period of 10 s.
6.2 Test sequence No. 2
This test sequence shall comprise 2 000 cycles of 10 min as follows:
flo
— A current KI for 10 s.
— A current Klf10/6 for 290 s.
— An off period of 300 s.
These test sequences are i
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