High voltage switchgear and controlgear - Part 111: Overhead, pad-mounted, dry vault, and submersible automatic circuit reclosers and fault interrupters for alternating current systems up to 38 kV

This standard covers required definitions, ratings, procedures for performing design tests, production tests, and construction requirements for overhead, pad-mounted, dry vault, and submersible automatic circuit reclosers and fault interrupters for alternating systems up to 38 kV are specified. (IEEE C37.60 compilation 2003) This publication has the status of a double logo IEEE/IEC standard

General Information

Status
Published
Publication Date
27-Nov-2005
Technical Committee
Current Stage
DELPUB - Deleted Publication
Start Date
25-Sep-2012
Completion Date
26-Oct-2025
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Standard
IEC 62271-111:2005 - High voltage switchgear and controlgear - Part 111: Overhead, pad-mounted, dry vault, and submersible automatic circuit reclosers and fault interrupters for alternating current systems up to 38 kV Released:11/28/2005 Isbn:2831883784
English language
71 pages
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INTERNATIONAL IEC
STANDARD 62271-111
First edition
2005-11
IEEE

C37.60
High voltage switchgear and controlgear –

Part 111:
Overhead, pad-mounted, dry vault, and
submersible automatic circuit reclosers
and fault interrupters for alternating
current systems up to 38 kV
Reference number
IEC 62271-111(E):2005
IEEE Std. C37.60(E):2003
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
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edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
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INTERNATIONAL IEC
STANDARD 62271-111
First edition
2005-11
IEEE

C37.60
High voltage switchgear and controlgear –

Part 111:
Overhead, pad-mounted, dry vault, and
submersible automatic circuit reclosers
and fault interrupters for alternating
current systems up to 38 kV
© IEEE 2005  Copyright - all rights reserved
IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Inc.
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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Telephone: +1 732 562 3800 Telefax: +1 732 562 1571 E-mail: stds-info@ieee.org Web: www.standards.ieee.org
Commission Electrotechnique Internationale
International Electrotechnical Commission
Международная Электротехническая Комиссия

– 2 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
CONTENTS
FOREWORD . 4
IEEE Introduction . 7
1. Scope.8
2. References.8
3. Definitions.10
4. Service conditions.11
4.1 Usual service conditions.11
4.2 Unusual service conditions.11
5. Rating.12
5.1 Rating information. 12
5.2 Rated maximum voltage.12
5.3 Rated power-frequency. 13
5.4 Rated continuous current.13
5.5 Rated minimum tripping current (for series-trip reclosers/FIs).14
5.6 Rated symmetrical interrupting current.14
5.7 Rated symmetrical making current.16
5.8 Rated lightning impulse withstand voltage.16
5.9 Rated control voltage and ranges. 16
5.10 Rated line and cable charging interrupting currents (where applicable). 16
6. Design tests (type tests).22
6.1 General. 22
6.2 Insulation (dielectric) tests.22
6.3 Switching tests. 25
6.4 Making current capability. 28
6.5 Rated symmetrical interrupting current tests. 28
6.6 Minimum tripping current tests. 39
6.7 Partial discharge (corona) tests. 40
6.8 Radio influence voltage tests (RIV). 41
6.9 Surge current test; series-trip reclosers/FIs.42
6.10 Temperature rise test. 43
6.11 Time–current tests.45
6.12 Mechanical duty test.46
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 6 1–70

IEEE C37.60-2003(E)
6.13 Control electronic elements surge withstand capability (SWC) tests . 46
6.14 Condition of recloser/FI after each test of 6.3 and 6.5 . 48
7. Production tests (routine tests) . 49
7.1 Reclosing and overcurrent trip calibration. 50
7.2 Control, secondary wiring, and accessory devices check tests. 50
7.3 Dielectric withstand test; 1-min. dry power-frequency. 50
7.4 Partial discharge test. 50
7.5 Mechanical operations tests.50
7.6 Water leak test . 51
8. Field tests on units in service, including dc withstand tests on cables. 51
9. Construction requirements. 52
9.1 Tank construction: submersible or dry vault reclosers/FIs . 52
9.2 Grounding provisions . 52
9.3 Insulating medium quantity indicators . 53
9.4 Oil sampling provision (submersible reclosers/FIs) . 53
9.5 Manual operating provision. 53
9.6 Position indicator. 53
9.7 Nameplate markings. 53
9.8 Stored energy mechanism charge indicator. 54
9.9 Enclosure integrity . 54
9.10 Counters. 54
9.11 Conductor terminal sizes . 54
9.12 Tank construction—pressurized reclosers/FIs only . 54
Annex A (informative) X/R Ratios. 55
Annex B (informative) Simulated surge arrester operation tests. 57
Annex C (normative) Method of drawing the envelope of the prospective transient
recovery voltage of a circuit and determining the representative parameters . 60
Annex D (informative) Background basis of recloser TRV values. 62
Annex E (informative) Altitude correction factors. 66
Annex F (informative) Bibliography. 69
Annex G (informative) List of Participants.70
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 7 1–70

– 4 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 111: Overhead, pad-mounted, dry vault, and submersible
automatic circuit reclosers and fault interrupters
for alternating current systems up to 38 kV
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to
promote international co-operation on all questions concerning standardization in the electrical and
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IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an
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6) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC/IEEE 62271-111 has been processed through IEC sub-
committee 17A: High-voltage switchgear and controlgear, of IEC technical committee 17:
Switchgear and controlgear.
The text of this standard is based on the following documents:
IEEE Std FDIS Report on voting
C37.60 (2003) 17A/737/FDIS 17A/746/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives.
The committee has decided that the contents of this publication will remain unchanged
until 2008.
The list of all the parts of IEC 62271 series, under the general title High-voltage switchgear
and controlgear, can be found on the IEC website.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.

IEEE C37.60-2003(E)
IEC/IEEE Dual Logo International Standards
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Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.

– 6 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
IEEE Standard for Overhead,
Pad-Mounted, Dry Vault, and
Submersible Automatic Circuit
Reclosers and Fault Interrupters
for Alternating Current Systems
Up to 38 kV
Sponsor
Switchgear Committee
of the
IEEE Power Engineering Society
Approved 20 March 2003
IEEE-SA Standards Board
Abstract: Required definitions, ratings, procedures for performing design tests, production tests,
and construction requirements for overhead, pad-mounted, dry vault, and submersible automatic
circuit reclosers and fault interrupters for alternating systems up to 38kV are specified.
Keywords: dry vault, fault interrupter, overhead, pad-mounted, recloser, submersible, standard
operating duty, switchgear
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:39 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 1 1–70

IEEE C37.60-2003(E)
IEEE Introduction
This standard has been revised from IEEE Std C37.60-1981, incorporating significant improvements
that reflect the present state of the art in recloser technology. These include changes and additions in
the following areas:
a) Expanded the standard to include gas-insulated reclosers.
b) Revisedthe title and scope tolimit the standard to 38kV; deletedratingsabove38kV nominal.
c) Added voltage ratings commonly used outside of North America with related dielectric
a
withstand capabilities taken from IEC 60694-2002.
d) Added several new interrupting ratings in the 15.5kV, 27kV, and 38kV ranges.
e) Revised limits of temperature and temperature rise to be consistent with circuit breaker
standards.
TM
f) Reorganized the switching tests into 6.3 following a format similar to IEEE Std 1247 -1998
and referenced IEEE Std 1247-1998 for switching test procedures.
g) Removed the requirement for transformer magnetizing tests; reference discussion in IEEE Std
1247-1998.
h) Clarified the intent of the switching tests as related required capabilities and prohibited the use
of single-phase tests to qualify three-phase reclosers in the performance of the switching tests.
i) Removed the altitude correction factors. (Refer to the following paragraph and informative
Annex E.)
j) Removed the X/R footnote and table of multiplication factors from old 5.6 to new informative
Annex A with expanded information and data.
k) Added new informative Annex B.
l) Addedtransientrecoveryvoltage(TRV)specificationsandinformativeAnnexCandAnnexD.
m) Restricted the use of single-phase testing to verify three-phase performance.
n) Reduced radio influence voltage (RIV) limits.
o) Added Partial Discharge as a design and production test.
p) Reduced dc withstand voltage test time from 15min. to 5min.
Although this revised standard will be published before the work on IEEE PC37.100.1, Draft
b
Standard Requirements for Power Switchgear [B13] is completed, it is the intention of the Recloser
Working Group to issue supplements or revisions to adopt common requirements. There was
considerablediscussionintheRecloserWorkingGroupregardingtheadditionofthepartialdischarge
test requirements suggesting that this topic should be revisited at the next revision cycle to see if the
data collected between now and then shall warrant any changes in the test procedure or test limits.
a
Information on references can be found in Clause 2.
b
The numbers in brackets correspond to the numbers of the bibliography in Annex F.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 3 1–70

– 8 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 111: Overhead, pad-mounted, dry vault, and submersible
automatic circuit reclosers and fault interrupters
for alternating current systems up to 38 kV
1. Scope
This standard applies to all overhead, pad-mounted, dry vault, and submersible single- or multipole
alternating current automatic circuit reclosers and fault interrupters for rated maximum voltages
above 1000V and up to 38kV.
In order to simplify this standard where possible, the term recloser/FI (reclosers/FIs) has been
substituted for automatic circuit recloser or fault interrupter or both.
NOTE—When reclosers are applied in a substation, special considerations may apply, see 6.5.1.5.3.
2. References
This standard shall be used in conjunction with the following publications. When the following
publications are superseded by an approved revision, the revision shall apply.
ANSI C37.06-2000, American National Standard for AC High-Voltage Circuit Breakers Rated on a
Symmetrical Current Basis—Preferred Ratings and Related Required Capabilities.
ANSI C37.06.1-2000, American National Standard Guide for AC High-Voltage Circuit Breakers
Rated on a Symmetrical Current Basis—Designated ‘‘Definite Purpose for Fast Transient Recovery
Voltage Rise Times.’’
ANSI publications are available from the Sales Department, American National Standards Institute, 11 West 42nd Street,
13th Floor, New York, NY 10036, USA (http://www.ansi.org).
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.

IEEE C37.60-2003(E)
ANSI C37.85-2002, American National Standard for Switchgear—Alternating-Current High-Voltage
Power Vacuum Interrupters—Safety Requirements for X-Radiation Limits.
ANSI C57.12.28-1999, American National Standard for Pad-mounted Equipment—Enclosure
Integrity.
ANSI C63.2-1996, American National Standard for Electromagnetic Noise and Field Strength
Instrumentation, 10kHz to 40GHz—Specifications.
ASME BPVC-1998, Boilers and Pressure Vessels Code—Section VIII: Rules for Construction of
Pressure Vessels—Division 1.
IEC 60060-1-1989, High-Voltage Test Techniques—Part 1: General Definitions and Test
Requirements.
IEC 60270-2000, High-Voltage Test Techniques—Partial Discharge Measurements.
IEC 60502-1-2004, Power Cables with Extruded Insulation and Their Accessories for Rated
Voltages from 1 kV (U ¼1,2 kV) Up to 30 kV (U ¼36 kV)—Part 1: Cables for Rated Voltages of
m m
1kV(U ¼1,2 kV) and 3 kV (U ¼3,6 kV).
m m
IEC 60502-2-2005, Power Cables with Extruded Insulation and Their Accessories for Rated
Voltagesfrom1kV(U ¼1,2kV)Upto30kV(U ¼36kV)—Part2:CablesforRatedVoltagesfrom
m m
6kV(U ¼7,2 kV) Up to 30 kV (U ¼36 kV).
m m
IEC60694-2002,CommonSpecificationsforHigh-VoltageSwitchgearandControlgearStandards.
IEC 62271-100-2003, High-Voltage Switchgear and Controlgear—Part 100: High-Voltage
Alternating-Current Circuit-Breakers.
TM 4,5
IEEE Std 4 -1995, IEEE Standard Techniques for High Voltage Testing.
TM
IEEE Std 4a -2001, Amendment to IEEE Standard Techniques for High-Voltage Testing.
TM
IEEE Std 386 -1995, IEEE Standard for Separable Insulated Connector Systems for Power
Distribution Systems Above 600V.
TM
IEEEStd1247 -1998,IEEEStandardforInterrupterSwitchesforAlternatingCurrentRatedAbove
1000 Volts.
TM
IEEE Std 1291 -1993, IEEE Guide for Partial Discharge Measurement in Power Switchgear.
IEEE Std C37.04-1999, IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers.
IEEE Std C37.09-1999, IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated
on a Symmetrical Current Basis.
ASMEpublicationsare available fromthe AmericanSociety of Mechanical Engineers,3 ParkAvenue,New York, NY10016-
5990, USA (http://www.asme.org).
IECpublicationsareavailablefromtheSalesDepartmentoftheInternationalElectrotechnicalCommission,CasePostale131,
3, rue de Varembe´, CH-1211, Gene`ve 20, Switzerland/Suisse (http://www.iec.ch/). IEC publications are also available in the
UnitedStatesfromtheSalesDepartment,AmericanNationalStandardsInstitute,11West42ndStreet,13thFloor,NewYork,
NY 10036, USA (http://www.ansi.org).
The IEEE standards or products referred to in Clause 2 are trademarks owned by the Institute of Electrical and Electronics
Engineers, Inc.
IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, P.O. Box 1331,
Piscataway, NJ 08855-1331, USA (http://standards.ieee.org/).
Edition 2.2 Consolidated edition.
Edition 1.1 Consolidated edition.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 10 1–70

– 10 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
TM
IEEE Std C37.41 -2000, IEEE Standard Design Tests for High-Voltage Fuses, Distribution
Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories.
TM
IEEE Std C37.90.1 -2002, IEEE Standard for Surge Withstand Capability (SWC) Tests for Relays
and Relay Systems Associated with Electric Power Apparatus.
TM
IEEE Std C37.100 -1992 (Reaff 2001), IEEE Standard Definitions for Power Switchgear.
NEMA 107-1987 (Reaff 1993), Methods of Measurement of Radio Influence Voltage (RIV) of High-
Voltage Apparatus.
3. Definitions
Thedefinitionsoftermscontainedinthisstandard,andtotherelatedstandardsforrecloser/FIs,shall
be in accordance with IEEE Std C37.100-1992. These definitions are not intended to embrace all
possible meanings of the terms. They are applicable only to the subject treated in this standard.
unit operation (of a recloser): An interrupting operation followed by a closing operation. The final
interruption is also considered one unit operation.
NOTE—See Figure 1.
Figure 1—Unit operation
NEMA publications are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112-5704,
USA (http://global.ihs.com/).
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 11 1–70

IEEE C37.60-2003(E)
4. Service conditions
4.1 Usual service conditions
Reclosers/FIs conforming to this standard shall be suitable for operation at their standard ratings
provided that:
� �
a) The temperature of the air (ambient temperature) is not above 40 C or below �30 C.
b) The altitude does not exceed 1000 m.
c) For submersible units, the water head does not exceed 3m above the base of the enclosure
during occasional submersion. Exposure to chemical or electrochemical reactions may be
encounteredinasubgradeenvironment.Thesubgradeenvironmentmaycontainchemicalsthat
contribute to mild corrosive reactions.
4.2 Unusual service conditions
Unusual service conditions shall include, but are not limited to, service conditions that exceed those
defined in 4.1 or extremes in:
a) Actual service duty cycle
b) System conditions
c) Site conditions
d) Shock and/or vibration
e) Damaging fumes or vapors
f) Excessive or abrasive dust
g) Explosive mixtures of dust or gases
h) Salt air or extreme humidity
Unusual service conditions shall be brought to the attention of those responsible for the manufacture
of the equipment to define or prevent loss of performance or service life, if any, from specified values.
Applicable standards such as those for altitude correction shall be used when available.
4.2.1 Abnormal ambient temperatures
Reclosers/FIsmaybeappliedathigherorlowerambienttemperaturesthanspecified,butperformance
may be affected and special consideration shall be given to these applications.
4.2.2 Altitudes above 1000m
Reclosers/FIs may be applied at altitudes higher than 1000m; however, the rated lightning impulse
withstand voltage, rated maximum voltage and rated continuous current shall be multiplied
individually by the correction factor (see following note) to obtain values at which the application
may be made. The rated symmetrical interrupting current, related required capabilities, and
interrupting times are not affected by altitude.
NOTE—Altitude correction factors are being studied by the Switchgear Committee and will be adopted by issuance of a
supplement or revision to this standard when they are approved. In the meantime, users should consult the manufacturer for
appropriate derating when the equipment is applied above 1000m. Refer also to Annex E.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.

– 12 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
5. Rating
5.1 Rating information
The ratings shall include the following:
a) Rated maximum voltage
b) Rated power-frequency
c) Rated continuous current
d) Rated minimum tripping current (series-trip reclosers only)
e) Rated symmetrical interrupting current
f) Rated symmetrical making current
g) Rated lightning impulse withstand voltage
h) Rated control voltage
NOTE—Switching tests as specified in 6.3 are related required capabilities.
5.2 Rated maximum voltage
The preferred values of rated maximum voltage of reclosers/FIs are those shown in Column 2 of
Table 1a) and Table 1b).
Table 1a)—Preferred voltage ratings and related test requirements for reclosers
(except those covered in Table 1b) (Note 1)
Power-frequency insulation level
withstand test kV
Rated lightning impulse
Rated maximum
(Warning Box and Note 3)
Line no. voltage withstand peak voltage kV
(Note 2) (Note 3)
kV 1min. dry 10s wet
Column 1 Column 2 Column 3 Column 4 Column 5
115 95 36 30
2 15.5 110 50 45
3 27 (Note 4) 60 50
4 38 150 70 60
11 12 75 28 23
12 17.5 95 38 32
13 24 125 50 45
14 36 170 70 60
WARNING
When performing tests involving open contacts in vacuum, adequate precautions such as shielding or distance
shouldbeusedtoprotecttestpersonnelagainstthepossibleoccurrencesofhigherX-radiationdue,forexample,to
incorrect contactspacing,or to the application of voltagesin excessof those specified. For example, maintaining a
distance of 2–3 m between the recloser/FI and all test personnel is a typical basic precaution to reduce the risk of
excess X-radiation exposure. Further discussion of shielding, adequate distances and personnel exposure limits are
found in ANSI Std C37.85-2002.
NOTES
1—The test values shown in Table 1a) are for design tests; refer to Clause 8 for field testing.
2—Lines 11–14 refer to distribution systems commonly found outside of North America; the test withstand levels were taken
from IEC 60694-2002, Table 1a).
3—These are performance characteristics specified as test requirements in this standard.
4—For oil interrupting reclosers, 150kV; for all others, 125kV.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 13 1–70

IEEE C37.60-2003(E)
Table 1b)—Preferred voltage ratings and related test requirements for pad-mounted,
dry vault and submersible reclosers, and nonreclosing fault interrupters,
all with vacuum or SF interrupters (Note 1)
Power-frequency insulation level
Withstand test
Rated lightning
withstand test kV
dc voltage kV
Rated maximum impulse withstand
(Warning Box and Note 3)
(Warning Box and
Line no. voltage peak voltage kV
Note 4) 5min.
(Note 2) kV (Note 3) 1min. dry 10s wet
Column 1 Column 2 Column 3 Column 4 Column 5 Column 6
2 15.5 95 35 Not required 53
3 27 125 40 Not required 78
4 38 150 50 Not required 103 (Note 3)
11 12 60 28 Not required 42
12 17.5 75 38 Not required 57
13 24 95 50 Not required 78
14 36 145 70 Not required 103 (Note 3)
WARNING
When performing tests involving open contacts in vacuum, adequate precautions such as shielding or distance
shouldbeusedtoprotecttestpersonnelagainstthepossibleoccurrencesofhigherX-radiationdue,forexample,to
incorrect contactspacing,or to the application of voltagesin excessof those specified. For example, maintaining a
distance of 2–3m between the recloser/FI and all test personnel is a typical basic precaution to reduce the risk of
excess X-radiation exposure. Further discussion of shielding, adequate distances and personnel exposure limits are
found in ANSI C37.85-2002.
NOTES
1—The test values shown in Table 1b) are for design tests; refer to Clause 8 for field testing.
2—Lines 11–14 refer to distribution systems commonly found outside of North America; the test withstand levels were taken
from IEC 60694-2002, Table 1a).
3—These are performance characteristics specified as test requirements in this standard.
4—DCwithstandtestsarerequiredforpad-mounted,dryvaultandsubmersiblegearsincethistypeofequipmentisinterfacedto
the power system via separable connectors. The test requirements of separable connectors are specified in Table 1 of IEEE Std
386-1995 and these values are reproduced here in Column 6. DC withstand testing of 36/38kV cables is not a recommended
practice. Very low frequency (VLF) testing is a relatively new practice being used as an alternative to the dc withstand test.
TM 7
Reference IEEE Std 433 -1979 [B8] . The dc withstand test requirement on the recloser/FI demonstrates its capability to
withstand either dc withstand or VLF testing of connected cables.
5.3 Rated power-frequency
The rated power-frequency shall be the frequency at which the recloser/FI and its components are
designed to operate. The preferred rated power-frequencies are 50Hz or 60Hz.
5.4 Rated continuous current
The preferred ratings for the continuous current of reclosers/FIs are those shown in Table 2.
5.4.1 Conditions of continuous current rating
a) Reclosers/FIs shall be used under the usual service conditions defined in 4.1.
b) Current ratings shall be based on the total temperature limits of the materials used. A
temperature rise reference is given to permit testing at reduced ambient.
The numbers in brackets correspond to those of the bibliography in Annex F.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 14 1–70

– 14 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
Table2—Preferredcontinuouscurrentratingsforreclosersandfaultinterrupters
Recloser or fault interrupter type Preferred continuous current ratings (A)
5 35 200
10 50 280
Series-trip reclosers/FIs 15 70 400
25 100 560
50 280 560
Oil interrupting shunt-trip reclosers/FIs
100 400 1120
100 315 800
200 400 1000
All other reclosers or fault interrupters
250 500 1250
NOTE—It is recognized that reclosers/FIs designed under an earlier revision of this standard may have
continuous current ratings not shown in Table 1. Examples include ratings of 560A, 600A, and 1200A.
c) Reclosers/FIs designed for installation in enclosures shall have their ratings based on the

ventilation of such enclosures and a 40 C ambient temperature outside the enclosure.
d) Outdoorreclosers/FIsandindoorreclosers/FIswithoutenclosuresshallhaveratingsbasedona

40 C ambient temperature.
5.4.2 Limits of observable temperature rise
At rated current, the observable hottest-spot temperature rise above ambient and the total
temperature of each of the various parts shall not exceed those listed in Table 3.
5.5 Rated minimum tripping current (for series-trip reclosers/FIs)
The preferred rated minimum tripping current shall be twice the continuous current rating with a
tolerance of �10%.
NOTE—The minimum tripping current for shunt-trip reclosers/FIs is variable and has no relation to the rated continuous
current. Information on specific reclosers/FIs should be obtained from the manufacturer.
5.6 Rated symmetrical interrupting current
The preferred values for the rated symmetrical interrupting currents of reclosers/FIs are as given in
Table 4 for series-trip reclosers/FIs and Column 4 of Table 5a), Table 5b), and Table 6 for shunt-trip
reclosers/FIs.
The rated symmetrical interrupting current shall be based on the capability of the reclosers/FIs to
interruptthecorrespondingasymmetricalcurrentincircuitshavingX/RvaluesasgiveninColumns5,
7,and9ofTable5a),Table5b),andTable6andwithapower-frequencyrecoveryvoltageequaltothe
rated maximum voltage and with transient recovery voltages as defined in 6.5.1.5.
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 15 1–70

IEEE C37.60-2003(E)
Table 3—Limits of temperature and temperature rise for various parts and
materials of reclosers/FIs
Total Temperature
temperature rise at
� �
Nature of the part and material (Notes 1, 2, and 3)
( C) ambient (40 C)

O (90 C) 90 50

A (105 C) 105 65

B (130 C) 130 90
1. Material used as insulation and
metal parts in contact with �
F (155 C) 155 115
insulation of these classes

(Note 4)
H (180 C) 180 140

C (220 C) 220 180
Oil (Note 5) 90 50
Bare copper and bare-copper alloy
—in air 75 35
—in SF (sulfurhexaflouride) 105 65
—in oil 80 40
Silver-coated or nickel-coated (Note 7)
—in air 105 65
2. Contacts (Note 6)
—in SF 105 65
—in oil 90 50
Tin-coated (Note 7)
—in air 105 65
—in SF 105 65
—In oil 90 50
Bare-copper, bare-copper alloy,
bare aluminum or bare-aluminum alloy
—in air 90 50
—in SF 115 75
—in oil 100 60
Silver-coated or nickel-coated
3. Connections, bolted or the
—in air 115 75
equivalent (Note 8)
—in SF 115 75
—in oil 100 60
Tin-coated
—in air 105 65
—in SF 105 65
—in oil 100 60
4. All other contacts or
connections made ofbaremetalsor
coated with other materials
(Note 9) (Note 9)
Bare-copper and bare-copper alloy 90 50
5. Terminals for the connection to
external conductors by screws or Silver-coated, nickel-coated, tin-coated 105 65
bolts (Note 10)
Other coatings (Note 9) (Note 9)
6. Metal parts acting as springs (Note 11) (Note 11)
Published by IEC under licence from IEEE. © 2005 IEEE. All rights reserved.
[12:40 7/8/03 K:/SGML/Ieee/C37.60-2003/Revises-III/C.37.60-2003.3d] Ref: C.37.60-2003 Page: 16 1–70

– 16 – IEC 62271-111:2005(E)
IEEE C37.60-2003(E)
NOTES
1—According to its function, the same part may belong to several categories as listed in Table 3. In this case, the permissible
maximum values of total temperature and temperature rise to be considered are the lowest among the relevant categories.
2—For sealed interrupters, the values of total temperature and temperature-rise limits are not applicable for parts inside the
sealed interrupter. The remaining parts shall not exceed the values of temperature and temperature rise given in Table 3.
3—The temperatures of conductorsbetweencontacts and connections arenot coveredin Table 3, as long as thetemperatureat
the point of contact between
...

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