I.S. EN 60420:1994
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
HIGH-VOLTAGE ALTERNATING CURRENT SWITCH-FUSE COMBINATIONS
Hardcopy , PDF
11-06-2003
English
01-01-1994
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Committees responsible
National foreword
Specification
1 General
2 Normal and special service conditions
3 Definitions
4 Rating
5 Design and construction
6 Type tests
7 Routine tests
8 Application guide for the selection of switch-fuse
combinations for service
9 Information to be given with enquiries, tenders
and orders
10 Rules for transport, storage, erection and
maintenance
Appendices
A Example of the co-ordination of fuses, switch and
transformer
B Justification of the procedure for determining
transfer current and of the parameters associated
with test duty 4
Tables
I Standard values of rated TRV (Based on practice in
Europe)
IA Standard values of rated TRV (Based on practice in
the United States of America and Canada)
II Nameplate markings
III Standard values of prospective TRV for test duty 2
(Based on practice in Europe)
IIIA Standard values of prospective TRV for test duty 2
(Based on practice in the United States of America
and Canada)
IV Standard values of prospective TRV for test duty 4
(Based on practice in Europe)
IVA Standard values of prospective TRV for test duty 4
(Based on practice in the United States of America
and Canada)
V Summary of test parameters for test duties 1 to 5
Annex
ZA Other International publications quoted in this
standard with the references of the relevant
European publications
Figures
1 Representation of a specified TRV by a two-
parameter reference line and a delay line
2 Example of a two-parameter reference line for a
TRV
3 Arrangement of test circuits for test duties 1 and
2
4 Arrangement of test circuits for test duty 3
5 Arrangement of test circuits for test duties 4 and
5
6 Determination of power-frequency recovery voltage
7 Practical determination of transfer current
8 Probable maximum and minimum time-current
characteristics of fuse
9 Transfer current in relation to the primary fault
current Isc due to a solid short in the
transformer secondary terminal
10 Characteristics relating to the protection of an
11 kV - 400 kVA transformer
11 Discrimination between HV and LV fuses
12 Characteristics for determining take-over current
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