IEEE Std C37.

41™-2016
(Revision of IEEE Std C37.41-2008)

Errata to
IEEE Standard Design Tests
for High-Voltage (>1000 V)
Fuses and Accessories

Copyright 2017 by The Institute of Electrical and Electronics Engineers, Inc.

All rights reserved. Published 2017.

This correction sheet may be freely reproduced and distributed in order to

maintain the utility and currency of the underlying Standard. This correction sheet may not be sold, licensed or otherwise
distributed for any commercial purposes whatsoever. The content of this correction sheet may not be modified.

Sponsor
Switchgear Committee
of the
Power and Energy Society

Correction Sheets
Issued 4 April 2017

Copyright © IEEE. All rights reserved.

STD21159E
 Correction sheets to IEEE Std C37.41™-2016

1. Overview

1.3 Background

1.3.2 Expulsion fuses

Insert the correct reference to Annex A as shown below:

Many expulsion fuses listed in 1.1 are covered in IEC 60282-2:2008 [B4] 1. The test requirements for Class
A [distribution class] 2 expulsion fuses are similar to the requirements for IEC class “A” fuses, and the Class
B [power class] expulsion fuse requirements are similar to the IEC class “B” fuse requirements. However
several minor differences exist between the specified testing requirements of IEC and IEEE/ANSI. There
are more significant differences in the types of testing covered (for example IEC includes no specific
testing for expulsion fuses in enclosures, or for fuses using polymeric insulators). Certain fuses common in
North American practice, but not covered by IEC 60282-2, (e.g., open-link cutouts) are included in Error!
Reference source not found. Annex A of this standard.

3. Definitions
Insert the correct reference to Annex A as shown below:

For the purposes of this document, the following terms and definitions apply. The IEEE Standards
Dictionary Online should be consulted for terms not defined in this clause.6 Definitions of terms used in the
main body of this standard appear in Clause 3, while definitions of terms used in Error! Reference source
not found. Annex A appear in A.1.

9. Interrupting tests

9.1 Requirements common to all interrupting tests

9.1.2 Test circuit

9.1.2.1 Test circuit configuration

Insert the correct reference to Annex E as shown below:

Typical test circuits are shown in Figure E.1. Methods of determining transient recovery voltage (TRV)
parameters are also shown in Error! Reference source not found. Annex E. Overvoltage protective
equipment used for protecting test circuit apparatus shall not significantly affect the current through the
fuse or the recovery voltage across the fuse.

Replace Table 5 with the table on the next page (the footnotes are on the page following Table 5).

1
The numbers in brackets correspond to those of the bibliography in Annex G.
2
The information in the brackets is a term used in IEC standards that may be similar to the term used in this document, a term that is
common in some parts of the world, or a term that has been used previously in IEEE or ANSI standards.
6
IEEE Standards Dictionary Online subscription is available at:
http://www.ieee.org/portal/innovate/products/standard/standards_dictionary.html.

2
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STD21159E
 Correction sheets to IEEE Std C37.41™-2016

Table 5 —Interrupting performance tests and test circuit parameters for expulsion fuses
Test Series
Parameters Class
1 2 3 4 5
Power-
frequency A and
Rated maximum voltage, V: +5%, −0% (see footnote a)
recovery B
voltage
A See Table 6 See Table 7
TRV
See Table 8 See footnote b
characteristics B See Table 8 (column 1)
(column 2)
A Rated maximum See 9.2.2.2d I 5 , from 2.7 to
Prospective I 2 , from 0.6 I 3 , from 0.2 I1
current—rms interrupting current, I4, from 400 3.3 times fuse
B I1 to 0.8 I1 to 0.3 I1 c
symmetrical I1 +5%, −0% A to 500 Ae rated current, I r e
See Table 9
X R ratio A See Table 9 (column 1)
(column 2) From 1.3 to 0.75
(power (from 0.6 to 0.8)
factor) B Not less than 15 (not greater than 0.067) See Table 10
Making angle Random
A
related to 1st test: from −5 to +15 timing
voltage 2nd test: from 85 to 105 From 85 to 105 Random timing
From −5 to
zero— B 3rd test: from 130 to 150
+15
degrees
Rated current A Min. Max. Min. Max. Min. Max. See 9.2.2.2 Min.
of fuse link or
B Min. Max. Min. Max. Min. Max. Min. Min.
fuse unitf
Number of
A 3 3 3 3 1 1 See 9.2.2.2 2
tests required
with above
fuse link or
B 3 3 3 3 1 1 2 2
fuse unit
ratingg
Number of
A 3 3 3 3 2 6
tests required
before
replacing
fuseholder B 3 3 3 3 2 4
and fuse
supportg
Number of
fuseholders to A and B 1 1 1 1 1 1
be testedg
Maximum
number of
A and B 1 1 1 1 1 1
fuse supports
to be testedg
Number of
tests on each
exhaust-
A and B 3 3 3 3 2 4
control
device, if
applicable
Duration of A and B (drop-
Not less than dropout time, or 0.5 s, whichever is greater
power- out)
frequency A (non drop-out) Not less than 0.5 s
recovery
voltage after B (non drop-out) Not less than 10 minh Not less than 1 min
interruption

3
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STD21159E
 Correction sheets to IEEE Std C37.41™-2016

Table 5—Interrupting performance tests and test circuit parameters for expulsion fuses
(continued)
a
When the fuse is intended to be used only in three-phase effectively grounded circuits, the manufacturer may elect to replace the Test
Series 1 (100% V and 100% I1 ) by one test duty at 87% V and 100% I1 and a second test duty with 100% V and 87% I1 . The tolerances
for voltages and currents are the same as those indicated in Table 5.
b
The TRV for this test circuit shall be critically damped. Shunting the load reactance with a resistance having a value equal to
approximately 40 times the value of the reactance is usually adequate to critically damp the circuit. However, if this value does not result
in critical damping, then the resistance may be reduced to achieve critical damping. For testing convenience, an oscillatory TRV may be
acceptable with the agreement of the manufacturer. Critical damping is obtained when:
f
R= o X
2 fn
where
f o is the natural frequency of the test circuit without damping
fn is the power frequency
X is the reactance of the test circuit at power frequency
c
For fuses with an interrupting rating of 2.8 kA or less, Test Series 3 need not be made.
d
For Class A fuses rated above 100 A, Test Series 4 need not be made.
e
The melting time shall be no less than 2 s. If the test involves a melting time appreciably higher than 2 s, the current may be increased to
obtain a melting time closer to 2 seconds.
f
“Min” and “Max” represent the minimum and maximum rated currents of a homogeneous series; see 9.2.2.
g
After each test, the refill unit or fuse link and expendable cap (if used) shall be replaced. A fuseholder and fuse support shall be capable,
at a minimum, of the number of tests listed as “Number of tests required before replacing fuseholder and fuse support.” Only the
manufacturer has the discretion to permit a fuseholder, or fuse support to be used for more than the specified number of individual tests.
After each test on a fuseholder that uses replaceable links, only the fuse link and the expendable cap, if used, may be replaced. Only the
manufacturer has the discretion to use an expendable cap for more than one test if it is determined that the cap was not damaged during a
previous test.
If the fuse element is an integral part of the fuseholder, then the number of fuseholders to be tested is the number listed for “Number of
tests required with above fuse link or fuse unit rating.”
The mounting brackets used for the cutout testing should be as specified in IEEE Std C37.42. Any deviation from this specification shall
be noted in the test report for the device.
h
If leakage current through the fuse is monitored following interruption, then the recovery voltage may be removed after leakage current
has been less than 1 mA for a 2 min duration.

Annex D

(informative)

Simplified fault-current calculation—interrupting duty and rated short-time

withstand current

Insert the variable in the variable list for the equation as shown:

2
 A  2
I asymetrical =   +D is the peak-to-peak value of alternating component
 2.828 

A is the peak-to-peak value of alternating component

D is the direct component (at the peak current)

4
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STD21159E
 Correction sheets to IEEE Std C37.41™-2016

Annex G

(informative)

Bibliography

Change the title of Bibliographic item [B5] as shown:

[B5] IEEE Std C37.45™, IEEE Standard for Test Requirements Design Tests and Specifications for High-Voltage (>
1000 V) Distribution Class Enclosed Single-Pole Air Switches.

5
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