IEEE C37.43.2008

M T

IEEE Standard Specifications for HighVoltage Expulsion, Current-Limiting, and Combination-Type Distribution and Power Class External Fuses, with Rated Voltages from 1 kV through 38 kV, Used for the Protection of Shunt Capacitors

3 4 . 7 3 C

IEEE Power Engineering Society

Sponsored by the Switchgear Committee

IEEE 3 Park Avenue New York, NY 10016-5997, USA

IEEE Std C37.43 ™-2008

25 July 2008

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IEEE Std C37.43™-2008

IEEE Standard Specifications for HighVoltage Expulsion, Current-Limiting, and Combination-Type Distribution and Power Class External Fuses, with Rated Voltages from 1 kV through 38 kV, Used for the Protection of Shunt Capacitors Sponsor

Switchgear Committee of the IEEE Power & Energy Society Approved 12 June 2008

IEEE-SA Standards Board

Authorized licensed use limited to: Univ of Calif San Francico. Downloaded on November 20,2014 at 18:52:03 UTC from IEEE Xplore. Restrictions apply.

Abstract: Specifications for high-voltage (above 1000 V) distribution and power class expulsion, current-limiting, and combination-type external capacitor fuses and accessories, with rated voltages from 1 kV through 38 kV, for protecting shunt capacitors complying with IEEE Std 182002 and NEMA CP 1-2000, are established in this standard. All of these devices are intended for use on ac systems. These fuses may be used with capacitor units, groups of units, or entire capacitor banks. Keywords: current-limiting fuses, distribution class fuses, expulsion fuses, fuse, fuse applications, fuse enclosure packages, high-voltage fuses, power class fuses, shunt capacitor

The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright © 2008 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 25 July 2008. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by the Institute of Electrical and Electronics Engineers, Incorporated. PDF: Print:

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Introduction This introduction is not part of IEEE Std C37.43-2008, IEEE Standard Specifications for High-Voltage Expulsion, Current-Limiting, and Combination-Type Distribution and Power Class External Fuses, with Rated Voltages from 1 kV through 38 kV, Used for the Protection of Shunt Capacitors.

This document is a new IEEE standard covering specifications for high-voltage distribution and power class expulsion, current-limiting, and combination types of external fuses for shunt capacitors. This standard was prepared by the IEEE Subcommittee on High-Voltage Fuses. Liaison was maintained with the International Electrotechnical Commission (IEC) during the development of the revisions in order to incorporate the latest thinking up to the time of publication. This standard is one of a series of complementary standards covering various types of high-voltage fuses and switches, arranged so that certain standards apply to all devices while other standards provide additional specifications for a particular device. For any device, IEEE Std C37.40 ™-2003, IEEE Std C37.41™-2000, plus an additional specification standard covering that device, constitute a complete set of a standards for the device. In addition, IEEE Std C37.48 ™-2005 is an application, operation, and maintenance guide for all the devices, and IEEE Std C37.48.1 ™-2002 provides additional guidelines for current-limiting fuses. The following standards make up this series:

 ANSI C37.42-1996, American National Standard Specification for High-Voltage Expulsion Type Distribution Class Fuses, Cutouts, Fuse Disconnecting Switches and Fuse Links.

 ANSI C37.46-2000, American National Standard for High Voltage Expulsion and Current-Limiting Type Power Class Fuses and Fuse Disconnecting Switches.

 ANSI C37.47-2000, American National Standard for High Voltage Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches.

 IEEE Std C37.40 ™-2003, IEEE Standard Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories.

 IEEE Std C37.41™-2000, IEEE Standard Design Tests for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories.

 IEEE Std C37.45 ™-2006, IEEE Standard Specifications for High-Voltage Distribution Class b

Enclosed Single-Pole Air Switches with Rated Voltages from 1 kV through 8.3 kV. (See [B1].)

 IEEE Std C37.48 ™-2005, IEEE Guide for Application, Operation, and Maintenance of High Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories.

 IEEE Std C37.48.1 ™-2002, IEEE Guide for the Operation, Classification, Application, and Coordination of Current-Limiting Fuses with Rated Voltages from 1–38 kV.

a b

Information on references can be found in Clause 2. The numbers in brackets correspond to those of the bibliography in Annex A.

iv Copyright © 2008 IEEE. All rights reserved.


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v Copyright © 2008 IEEE. All rights reserved.


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Participants At the time this standard was submitted to the IEEE-SA Standards Board for approval, the Revision of Fuse Specification Standards Working Group had the following membership: Mark W. Stavnes, Chair Frank J. Muench,

Chris Ambrose Glenn R. Borchardt Sheila Brown Dan Gardner Gary W. Hayes

Secretary

Frank Ladonne John G. Leach James R. Marek Sean W. Moody R. Neville Parry

Carl Reigart Timothy E. Royster John S. Schaffer John G. St. Clair Jan A. Zawadzki

The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. William J. Ackerman Chris Ambrose J. Angelis Adam Bagby Robert Barnett Steven Bezner William Bloethe Glenn R. Borchardt Steven Brockschink Chris Brooks Ted Burse Thomas Callsen Tommy Cooper F. A. Denbrock Alexander Dixon Donald Dunn Gearold O. H. Eidhin Gary Engmann Marcel Fortin Fredric Friend

Manuel Gonzalez Keith Gray Randall Groves John Harder Gary Heuston R. Jackson Joseph L. Koepfinger Jim Kulchisky Chung-Yiu Lam Stephen Lambert John G. Leach Albert Livshitz Federico Lopez Frank W. Mayle Georges Montillet Jerry Murphy Jeffrey Nelson Arthur Neubauer Michael S. Newman

T. Olsen R. Neville Parry Iulian Profir Michael Roberts Charles Rogers Joseph R. Rostron Thomas Rozek Steven Sano Bartien Sayogo James E. Smith Jerry Smith Mark E. Stavnes S. Telander John Vergis Waldemar Von Miller Kenneth White James Wilson Larry Yonce Jan A. Zawadzki Ahmed Zobaa

vi Copyright © 2008 IEEE. All rights reserved.


When the IEEE-SA Standards Board approved this standard on 12 June 2008, it had the following membership: Robert M. Grow, Chair Thomas Prevost, Vice Chair Steve M. Mills, Past Chair Judith Gorman, Secretary Victor Berman Richard DeBlasio Andy Drozd Mark Epstein Alexander Gelman William Goldbach Arnie Greenspan Ken Hanus

Jim Hughes Richard Hulett Young Kyun Kim Joseph L. Koepfinger* John Kulick David J. Law Glenn Parsons

Ron Petersen Chuck Powers Narayanan Ramachandran Jon Walter Rosdahl Anne-Marie Sahazizian Malcolm Thaden Howard Wolfman Don Wright

*Member Emeritus

Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal, NRC Representative Michael H. Kelley, NIST Representative Lisa Perry IEEE Standards Project Editor Matthew J. Ceglia IEEE Standards Program Manager, Technical Program Development

vii Copyright © 2008 IEEE. All rights reserved.


Contents 1. Overview .................................................................................................................................................... 1 1.1 Scope ................................................................................................................................................... 1 1.2 Background.......................................................................................................................................... 2 2. Normative references.................................................................................................................................. 2

3. General rating information ......................................................................................................................... 3 3.1 Ratings of capacitor fuse supports ....................................................................................................... 3 3.2 Ratings of fuseholders, fuses, fuse units, refill units, and fuse links for capacitor fuses ..................... 4 3.3 Preferred ratings and performance requirements................................................................................. 4 4. Design test requirements ............................................................................................................................ 8 4.1 Dielectric tests ..................................................................................................................................... 8 4.2 Interrupting [breaking] tests ................................................................................................................ 8 4.3 Radio-influence tests ........................................................................................................................... 9 4.4 Temperature-rise tests.......................................................................................................................... 9 4.5 Time-current tests ................................................................................................................................ 9 5. Time-current-characteristic requirements for capacitor fuse refill units, fuse units, and fuse links ......... 10 5.1 General .............................................................................................................................................. 10 5.2 Melting current tolerance................................................................................................................... 10 6. Conformance test requirements for capacitor fuses.................................................................................. 10

7. Construction requirements for capacitor fuses ......................................................................................... 10

8. Nameplate marking requirements............................................................................................................. 10 8.1 Fuses, fuse units, and fuseholders for capacitor fuses ....................................................................... 10 8.2 Fuse links and refill units................................................................................................................... 11 8.3 Fuse supports ..................................................................................................................................... 11 8.4 Additional information ...................................................................................................................... 11 9. Application requirements ......................................................................................................................... 11

Annex A (informative) Bibliography ........................................................................................................... 12

viii Copyright © 2008 IEEE. All rights reserved.


IEEE Standard Specifications for HighVoltage Expulsion, Current-Limiting, and Combination-Type Distribution and Power Class External Fuses, with Rated Voltages from 1 kV through 38 kV, Used for the Protection of Shunt Capacitors IMPORTANT NOTICE: This standard is not intended to assure safety, security, health, or environmental protection in all circumstances. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requirements. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from IEEE or viewed at http://standards.ieee.org/IPR/disclaimers.html .

1. Overview 1.1 Scope This standard establishes specifications for high-voltage (above 1000 V) distribution and power class expulsion, current-limiting, and combination-type external capacitor fuses and accessories, with rated voltages from 1 kV through 38 kV, for protecting shunt capacitors complying with IEEE Std 18 ™-20021 and NEMA CP 1-2000. All of these devices are intended for use on ac systems. These fuses may be used with capacitor units, groups of units, or entire banks and include specific capacitor line [group] and capacitor unit fuse types as follows: a)

Current-limiting fuses

b)

Expulsion fuses

1

Information on references can be found in Clause 2.

1 Copyright © 2008 IEEE. All rights reserved.


IEEE Std C37.43-2008 IEEE Standard Specifications for High-Voltage Expulsion, Current-Limiting, and Combination-Type Distribution and Power Class External Fuses, with Rated Voltages from 1 kV through 38 kV, Used for the Protection of Shunt Capacitors

c)

Combination of current-limiting and expulsion fuses

d)

Fuse supports, fuse mountings, and accessories used with fuses of type a), type b), and type c)

e)

Current-limiting, expulsion, and combination-type capacitor fuses [type a), type b), and type c), respectively] used in fuse enclosure packages (FEPs)

1.2 Background The expulsion, current-limiting, and combination types of fuses listed in 1.1 are similar to those covered in IEC 60549:1976. IEC 60549:1976 references IEC 60282-1:2002 and IEC 60282-2:1997. Use caution if devices specified and tested per IEC standards are compared to those specified and tested per IEEE or ANSI standards. Differences in test requirements between the two groups of standards may result in devices tested to IEC not being suitable for applications where devices tested to IEEE/ANSI standards are required, or vice-versa. For definitions of fuse-specific terminology, see IEEE Std C37.40 ™. In the headings and the text of this standard, there will be some areas where the information is included in brackets [ ]. The information in the brackets is a term used in IEC standards that may be similar to the term used in this standard, a term that is common in some parts of the world, or a term that has been used previously in IEEE or ANSI standards. Caution is advised when making comparisons. Fuses used for the protection of shunt capacitors are either line [group] fuses or unit [individual] fuses. Line fuses are used for the protection of one phase of a capacitor bank that may have one capacitor unit or multiple capacitor units per phase. Line fuses are generally restricted to small capacitor banks. Some line fuses are not used only for capacitor protection, and in many cases their major applications are for the protection of other devices or circuit sectionalization. Because of this, many specification requirements for line fuses are the same as those that are assigned to the particular fuse type for these other applications. Even fuses intended to be used only as capacitor line fuses will have some requirements that are similar to those used in these other applications. Therefore, for these specification requirements, this standard will refer to those requirements in the appropriate fuse-type specification standard. Unit fuses are used for the protection of one capacitor unit and are generally used in capacitor banks that have many capacitor units per phase. Unit fuses are used only for capacitor protection and are designed so that they are generally mounted on the bus bar of the capacitor bank. Unit fuse specification requirements are contained completely in this standard.

2. Normative references The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies. ANSI C37.42-1996, American National Standard Specification for High-Voltage Expulsion Type Distribution Class Fuses, Cutouts, Fuse Disconnecting Switches and Fuse Links.2 ANSI C37.46-2000, American National Standard for High Voltage Expulsion and Current-Limiting Type Power Class Fuses and Fuse Disconnecting Switches.

2

ANSI publications are available from the Sales Department, American National Standards Institute, 25 West 43rd Street, 4th Floor, New York, NY 10036, USA (http://www.ansi.org/).




ANSI C37.47-2000, American National Standard for High Voltage Current-Limiting Type Distribution Class Fuses and Fuse Disconnecting Switches. IEC 60282-1:2002 (Edition 5.0), High-voltage fuses—Part 1: Current-limiting fuses. 3 IEC 60282-2:1997, High-voltage fuses—Part 2: Expulsion fuses. IEC 60549:1976, High-voltage fuses for the external protection of shunt power capacitors. IEEE Std 18 ™-2002, IEEE Standard for Shunt Power Capacitors. 4, 5 IEEE Std C37.40 ™-2003, IEEE Standard Service Conditions and Definitions for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories. IEEE Std C37.41 ™-2000, IEEE Standard Design Tests for High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories. IEEE Std C37.48 ™-2005, IEEE Guide for Application, Operation, and Maintenance of High-Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches, and Accessories. IEEE Std C37.48.1 ™-2002, IEEE Guide for the Operation, Classification, Application, and Coordination of Current-Limiting Fuses with Rated Voltages 1–38 kV. NEMA CP 1-2000, Shunt Capacitors. 6

3. General rating information 3.1 Ratings of capacitor fuse supports The ratings of capacitor fuse supports shall be applicable for the service conditions specified in 3.1.1 of IEEE Std C37.40-2003. The ratings are validated as follows: a)

Rated continuous current is validated by temperature-rise design tests at rated continuous current as specified in 4.4.

b)

Rated maximum voltage is validated by either the dielectric withstand of the insulators as specified in 4.1 or the rated voltage interrupting tests as specified in 4.2 (whichever is lower).

c)

Rated lightning impulse withstand voltage [basic impulse insulation level (BIL)] is validated by the impulse withstand tests specified in 4.1.

It should be noted that for service conditions specified in 3.1.2 or 3.2 of IEEE Std C37.40-2003, additional testing, to validate the rating of the device, may be required.

3

IEC publications are available from the Sales Department of the International Electrotechnical Commission, Case Postale 131, 3, rue de Varembé, CH-1211, Genève 20, Switzerland/Suisse (http://www.iec.ch/). IEC publications are also available in the United States from the Sales Department, American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036, USA. 4 IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 08854, USA (http://standards.ieee.org/). 5 The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers, Inc. 6 NEMA publications are available from Global Engineering Documents, 15 Inverness Way East, Englewood, CO 80112, USA (http://global.ihs.com/).




3.2 Ratings of fuseholders, fuses, fuse units, refill units, and fuse links for capacitor fuses The ratings of fuseholders, fuses, fuse units, refill units, and fuse links for capacitor fuses shall be applicable for the service conditions specified in 3.1.1 of IEEE Std C37.40-2003. The ratings are validated as follows: a)

Rated continuous currents validated by the temperature-rise design tests specified in 4.4, and if applicable in accordance with the preferred ratings specified in 3.3.

b)

Rated maximum voltages, specified in 3.3.1, are validated by the current interrupting design tests at rated maximum voltage as specified in 4.2.

c)

Rated power frequency is specified in 3.3.4.

d)

Rated maximum inductive and capacitive interrupting [breaking] current and rated minimum inductive and capacitive interrupting [breaking] current as follows: 1)

Rated maximum inductive and capacitive interrupting current for fuseholders, fuses, fuse units, and refill units, specified in 3.3.5 and 3.3.6, is validated by the current interrupting design tests at rated maximum voltage as specified in 4.2.

2)

Rated minimum inductive and capacitive interrupting current for backup current-limiting fuses, specified in 3.3.7, is validated by the current interrupting design tests specified in 4.2.

Distribution and power class current-limiting fuses have three different subclasses that depend on the low current interrupting capability of the fuse. The three subclasses are backup currentlimiting fuses, general-purpose current-limiting fuses, and full-range current-limiting fuses. Only backup current-limiting fuses have a rated minimum interrupting current. The other two types have low current capabilities as described in their definitions. Refer to IEEE Std C37.402003 for the definitions of these devices. It should be noted that for service conditions specified in 3.1.2 or 3.2 of IEEE Std C37.40-2003, additional testing, to validate the rating of the device, may be required.

3.3 Preferred ratings and performance requirements 3.3.1 Rated maximum voltage The preferred rated maximum voltages for future designs of capacitor fuses shall be 2.8 kV, 5.5 kV, 8.3 kV, 15.5 kV, 17.2 kV, 23 kV, 27 kV, and 38 kV. Presently there are also ratings of 1.2 kV, 1.8 kV, 2.5 kV, 3 kV, 4.3 kV, 5 kV, 8.0 kV, 9.7 kV, 10 kV, 15 kV, 16.6 kV, 20 kV, 25 kV, and 26.2 kV being manufactured and used. The previously listed ratings apply primarily to line fuses, since unit fuses are many times designed specifically for a particular capacitor bank. Information regarding rated maximum voltage for all capacitor fuses is specified as follows: a)

The rated voltage ( V r ) of a fuse is its rated maximum voltage. That is, the maximum power frequency voltage at which it is intended to be applied.

b)

When a fuse is subjected to power-frequency capacitive currents, it shall be capable of operating continuously at a voltage of V r and then withstand this voltage plus any dc voltage component that results from any capacitive charge trapped on the capacitor or capacitor bank after the fuse melts and subsequently clears the circuit.

c)

The fuse rated voltage is based on proper fuse operation at the maximum continuous system operating voltage. It does not include provision for operation during transient or short-time overvoltage conditions associated with restriking circuit breakers, system faults, etc.




d)

A fuse shall be capable of disconnecting a faulty capacitor unit at the maximum crest voltages specified in Table 1, Column 2.

e)

A fuse shall be capable of withstanding a crest recovery voltage, which is the fundamental frequency voltage appearing across the blown fuse during the first cycle after interrupting, including any dc component. This fuse crest recovery voltage capability shall be as specified in Table 1, Column 3.

Table 1 —Crest recovery voltages for capacitor fuses Type of fuse

Maximum crest voltage (V)

a

Crest recovery voltage (V)

Non-current limiting

1.0V r 2

2.0V r 2

Current limiting

2.0V r 2

2.0V r 2

a

The values in Column 2 are based on the voltages that normally can occur across the capacitor unit terminals. These values are transients of short duration, with a steady-state value of V r .

3.3.2 Rated continuous current for capacitor fuse supports and fuseholders The preferred rated continuous currents for capacitor fuse supports are 50 A, 100 A, 200 A, 300 A, and 400 A.

3.3.3 Rated continuous current for capacitor fuses, fuse units, refill units, and fuse links The preferred rated continuous currents of a fuse, fuse units, refill units, and fuse links for capacitor fuses are 0.5 A, 1 A, 2 A, 3 A, 6 A, 8 A, 10 A, 15 A, 18 A, 20 A, 25 A, 30 A, 40 A, 50 A, 65 A, 80 A, 100 A, 125 A, 150 A, 200 A, 250 A, 300 A, and 400 A. NOTE—Some distribution class line [group]-type capacitor fuses presently being manufactured may have ratings of 5 A, 7 A, 12 A, 75 A, 115 A, 120 A, 130 A, 135 A, 140 A, 165 A, and 175 A. 7

3.3.4 Rated power frequency The preferred rated power frequencies of capacitor fuses are 50 Hz, 60 Hz, and both.

3.3.5 Rated maximum inductive interrupting [breaking] current The preferred rated maximum symmetrical inductive interrupting currents of capacitor fuses are 1 kA rms, 1.25 kA rms, 1.6 kA rms, 2 kA rms, 2.5 kA rms, 3.15 kA rms, 4 kA rms, 5 kA rms, 6.3 kA rms, 8 kA rms, 10 kA rms, 12.5 kA rms, 16 kA rms, 20 kA rms, 25 kA rms, 31.5 kA rms, 40 kA rms, and 50 kA rms. NOTE 1— The preferred rated interrupting currents are selected from the R10 series of numbers. The R10 series is comprised of the numbers 1, 1.25, 1.60, 2.00, 2.50, 3.15, 4.00, 5.00, 6.30, 8.00, and their multiples of 10. NOTE 2— Some distribution class line [group]-type capacitor fuses presently being manufactured may have rated maximum symmetrical inductive interrupting current ratings of 1.3 kA, 1.4 kA, 2.8 kA, 3.55 kA, 5.6 kA, 7.1 kA, 8.6 kA, 10.6 kA, 11.2 kA, 13.2 kA, 15 kA, 35 kA, 60 kA, 90 kA, 115 kA.

7

Notes in text, tables, and figures of a standard are given for information only and do not contain requirements needed to implement this standard.




3.3.6 Rated maximum capacitive interrupting [breaking] current for line [group]-type fuses The preferred rated maximum symmetrical capacitive interrupting currents for capacitor line fuses are 1 kA rms, 2.5 kA rms, 3.15 kA rms, 4 kA rms, 5 kA rms, 6.3 kA rms, 8 kA rms, 10 kA rms, 12.5 kA rms, 16 kA rms, 20 kA rms, 25 kA rms, 31.5 kA rms, 40 kA rms, and 50 kA rms. NOTE—Rated interrupting currents are selected from the R10 series of preferred numbers. The R10 series is comprised of the numbers 1, 1.25, 1.60, 2.00, 2.50, 3.15, 4.00, 5.00, 6.30, 8.00, and their multiples of 10.

3.3.7 Rated maximum capacitive interrupting [breaking] current for unit-type fuses The preferred rated maximum symmetrical capacitive interrupting currents for all types of capacitor unit fuses are 20 and 50 times the rated current of the highest rating in the homogeneous series. The preferred rated maximum symmetrical capacitive interrupting currents are 1 kA rms, 1.25 kA rms, 1.6 kA rms, 2 kA rms, 2.5 kA rms, 3.15 kA rms, 4 kA rms, 5 kA rms, 6.3 kA rms, 8 kA rms, and 10 kA rms. For current-limiting fuses, the homogeneous series characteristics are described in 6.6.4 of IEEE Std C37.412000. For expulsion fuses, the homogeneous series characteristics are specified in the Table 15 notes of IEEE Std C37.41-2000. NOTE 1— Rated interrupting currents are selected from the R10 series of preferred numbers. The R10 series is comprised of the numbers 1, 1.25, 1.60, 2.00, 2.50, 3.15, 4.00, 5.00, 6.30, 8.00, and their multiples of 10 . NOTE 2— Some distribution class unit-type capacitor fuses presently being manufactured may have rated maximum symmetrical capacitive interrupting current ratings of 0.8 kA, 1.4 kA, 1.9 kA, 2.3 kA, and 2.9 kA.

3.3.8 Rated minimum interrupting [breaking] current The rated minimum capacitive interrupting current for all types of capacitor fuses and the rated minimum inductive interrupting current for current-limiting backup capacitor fuses shall be designated by the manufacturer.

3.3.9 Rated maximum capacitor stored energy (joules) for the capacitor discharge interrupting tests The preferred ratings of the parallel energy stored in the capacitor, for the capacitor discharge interrupting test are 10 kJ, 15 kJ, 30 kJ, 50 kJ, 63 kJ, 80 kJ, and 100 kJ. NOTE—Some distribution class capacitor fuses presently being manufactured may have rated ratings of 75 kJ, 77 kJ, 85 kJ, and 88 kJ.

3.3.10 Rated lightning impulse withstand voltage [basic insulation level (BIL)] 3.3.10.1 Line-type fuses The preferred rated lightning impulse withstand voltage [basic impulse insulation level (BIL)] for line-type fuse supports are as specified in Table 2.

3.3.10.2 Unit-type fuses The rated lightning impulse withstand voltage [basic impulse insulation level (BIL)] for unit-type fuses is dependent on the capacitor bank configuration and design and therefore cannot be assigned to the fuse itself.




Table 2 —Ratings and other electrical properties for line-type fuses and fuse cutouts Applicable table numbers Fuse cutout or fuse type

Expulsion-type distribution fuses, cutouts, and fuse supports Expulsion and currentlimiting-type power class fuses and fuse supports Current-limiting-type distribution fuses and fuse supports

Ratings

Dielectric withstand test voltages

RIV

Maximum overvoltage current-limiting fuses

ANSI C37.42-1996

1, 5, 6, and 7

2

3

N/A

ANSI C37.46-2000

1

2, 3, and 4

6

5

ASNI C37.47-2000

1

2 and 3

5

4

Applicable standards

3.3.11 Performance characteristics 3.3.11.1 Performance characteristics of capacitor fuse supports The performance characteristics of capacitor fuse supports shall include the following: a)

Power-frequency dry-withstand voltages as specified in 4.1

b)

Power-frequency wet- or dew-withstand voltages of outdoor and indoor fuses, as specified in 4.1

c)

Temperature-rise limitations, as specified in 4.4 and Table 1 of IEEE Std C37.40-2003

d)

Radio-influence voltage (RIV), as specified in 4.3

3.3.11.2 Performance characteristics of fuse units, refill units, and fuse links and associated fuseholders for capacitor fuses The performance characteristics of fuse units, refill units, and fuse links and associated fuseholders for capacitor fuses shall include the following: a)

Melting time-current characteristics, determined as specified in 4.5

b)

Total clearing time-current characteristics, determined as specified in 4.5

c)

Cutoff characteristics, determined as specified in Clause 6 of IEEE Std C37.41-2000 (for current-limiting or combination capacitor fuses only)

d)

Overvoltage characteristics, determined as specified in Clause 6 of IEEE Std C37.41-2000 (for current-limiting or combination capacitor fuses only)

3.3.12 Rating and performance values for line-type fuses The rating and performance characteristics for line-type fuses, except temperature rise, shall be as specified in Table 2. Temperature rise shall be as specified in Table 1 of IEEE Std C37.40-2003.




3.3.13 Rating and performance values for unit-type fuses The rating and performance characteristics for unit-type fuses, except temperature rise, are specified in this standard. Some requirements are dependent on the capacitor bank configuration and design and cannot be assigned to the fuse itself. Temperature rise shall be as specified in Table 1 of IEEE C37.40-2003.

3.3.14 Ratings and performance requirements other than preferred In this standard, the rating and performance requirements are preferred values. Special circuit or environmental conditions may require devices with ratings or performance requirements that are different from the preferred values specified in 3.3. For these devices, the ratings and performance requirements shall be agreed upon by the user and the manufacturer, and additional testing may be required to validate that the device is suitable for the intended application.

4. Design test requirements 4.1 Dielectric tests 4.1.1 Line-type fuses Capacitor line-type fuses shall be capable of withstanding the test voltages shown in Table 2 when tested as specified in Clause 5 of IEEE Std C37.41-2000.

4.1.2 Unit-type fuses Dielectric tests for unit-type fuses are dependent on the capacitor bank configuration and design and cannot be assigned to the fuse itself.

4.1.3 Capacitor fuses used in containers or FEPs Line-type capacitor fuses used in containers or enclosures shall be capable of withstanding the test voltages specified in Table 1 when tested as specified in Clause 5 of IEEE Std C37.41-2000. Dielectric tests for unit-type fuses are dependent on the capacitor bank configuration and design and, therefore, cannot be assigned to the fuse itself.

4.2 Interrupting [breaking] tests Capacitor fuses shall be tested for inductive current, capacitive current, and, where applicable, discharge current. These interrupting tests are specified in 6.10 of IEEE Std C37.41-2000.

4.2.1 Inductive and capacitive interrupting currents All capacitor fuses shall be capable of interrupting all capacitive currents from the rated minimum capacitive interrupting current up to and including the rated maximum capacitive interrupting current assigned by the manufacturer. Where capacitor fuses may be required to interrupt inductive currents, they shall be capable of interrupting such currents up to the rated maximum inductive interrupting current of the device. Refer to IEEE Std C37.41-2000 for testing details.




All capacitor fuses shall be capable of interrupting these power frequency currents with all degrees of fault initiation making angle as related to voltage zero. Capacitor fuses that use replaceable fuse links shall be capable of interrupting these currents with any type and size of link recommended by the manufacturer.

4.2.2 Capacitor discharge current For capacitor discharge current interrupting tests, the capacitor fuse shall be capable of interrupting all capacitor discharge energy up to the maximum joule rating assigned. Capacitor fuses that use replaceable fuse links shall be capable of interrupting these currents with any size and type of link as recommended by the manufacturer.

4.2.3 Peak overvoltages for distribution and power class current-limiting fuses Peak overvoltages for current-limiting or combination capacitor fuses, as determined in accordance with Clause 6 of IEEE Std C37.41-2000, shall not exceed those specified in Table 4 of ANSI C37.47-2000 and Table 5 of ANSI C37.46-2000.

4.2.4 Peak let-through [cutoff] current Peak let-through [cutoff] current for current-limiting or combination capacitor fuses shall be determined as specified in Clause 6 of IEEE Std C37.41-2000.

4.3 Radio-influence tests Line-type capacitor fuses, when tested as specified in Clause 9 of IEEE Std C37.41-2000, shall be capable of meeting the limits of RIV at the test voltages specified in Table 1. RIV for unit fuses is d ependent on the capacitor bank configuration and cannot be assigned to the fuse itself.

4.4 Temperature-rise tests Capacitor fuses, when tested as specified in Clause 11 of IEEE Std C37.41-2000, shall not exceed the temperature rise and total temperature values specified in Table 1 of IEEE Std C37.40-2003 when the device is carrying rated continuous current and the ambient temperature of the test is within the allowable range specified. Fuse devices being tested shall be fused with the maximum rated fuse unit, refill unit, or fuse link that is used in the device being tested. Clause 11 of IEEE Std C37.41-2000 covers testing of devices used at ambient temperatures of 40 °C and below. For higher ambient temperatures, consult the manufacturer.

4.5 Time-current tests The minimum melting and total clearing time-current curves for capacitor fuse units, refill units, and fuse links shall be determined as specified in Clause 12 of IEEE Std C37.41-2000. A sufficient number of tests shall be made to ensure that all fuse units, refill units, and fuse links meet the melting current tolerance specified in 5.2.




5. Time-current-characteristic requirements for capacitor fuse refill units, fuse units, and fuse links 5.1 General To comply with this standard, capacitor fuse refill units, fuse units, and fuse links are not required to meet any particular time-current characteristic. Some fuse refill units, fuse units, or fuse links have been designed to comply with the melting characteristics that have been designated as “C,” “E,” “K,” “T,” or other designations. A “C,” “E,” “K,” or “T” designation specifies a range of currents that an individual fuse must melt at for particular times. The assignment of “C,” “E,” “K,” or “T” rating to a fuse does not make any particular “C,” “E,” “K,” or “T” fuse interchangeable with any other particular fuse having this rating since the shape of the curves may be significantly different and/or its interrupting capabilities may be different. The slope and shape of the melting curve is determined by the design of the current responsive element and is a distinctive feature of each manufacturer.

5.2 Melting current tolerance For all types of capacitor fuse refill units, fuse units, or fuse links, the maximum melting current shall not exceed the minimum melting current by more than 20% for any given melting time.

6. Conformance test requirements for capacitor fuses For line-type capacitor fuses, the conformance tests, as defined in Clause 3 of IEEE Std C37.40-2003, shall consist of a power-frequency dry-withstand voltage test on the fuse support. Unit-type fuses do not have conformance test requirements.

7. Construction requirements for capacitor fuses For capacitor fuses that use replaceable fuse links, the fuse links shall meet the mechanical interchangeability requirements specified in 4.4 in ANSI C37.42-1996.

8. Nameplate marking requirements 8.1 Fuses, fuse units, and fuseholders for capacitor fuses The following minimum information shall be placed on all fuses, fuse units, and fuseholders: a)

Manufacturer’s name or trademark (logo or monogram)

b)

Rated continuous current

c)

Manufacturer’s type or other product identification. For current-limiting fuses and fuse units, the applicable identification letters may follow the continuous current rating (e.g., 25 C, 50 C, 80 C, etc.)

d)

Rated maximum voltage

e)

Rated maximum inductive interrupting current in rms symmetrical amperes




f)

Rated maximum capacitive interrupting current in rms symmetrical amperes

g)

For backup current-limiting-type capacitor fuses only, the minimum capacitive interrupting current and/or, where applicable, rated minimum interrupting current rms symmetrical amperes

8.2 Fuse links and refill units The following minimum information shall be placed on all fuse links and refill units: a)

Manufacturer’s name or trademark (logo or monogram).

b)

Rated continuous current.

c)

Manufacturer’s type or other product identification. The applicable identification letters may follow the continuous current rating (e.g., 12 K, 25 T, 50 D, 25 E, etc.).

d)

Rated maximum voltage on refill units. Rated maximum voltage is not typically marked on fuse links. If voltage restrictions do exist on fuse links, this information shall be published in the manufacturer’s literature.

8.3 Fuse supports The following minimum information shall be placed on all fuse supports: a)

Manufacturer’s name or trademark (logo or monogram)

b)

Rated continuous current

c)

Manufacturer’s type or other product identification

d)

Rated maximum voltage

e)

Rated lightning impulse withstand voltage [basic impulse insulation level (BIL)]

8.4 Additional information Fuses may be designed for use at 50 Hz, 60 Hz, or both frequencies. Information on the suitability of fuses for a particular frequency is typically contained in the manufacturer’s literature. If there is a difference in rated performance between a system frequency of 50 Hz and 60 Hz, the rating information at each frequency, or the only permissible frequency, shall be published in the manufacturer’s literature. It is recommended that any packaging that may be used by the consumer for storage purposes be labeled so the contents can be easily and properly identified.

9. Application requirements See IEEE Std C37.48-2005 and IEEE Std C37.48.1-2002 for general application guidelines. The discharge interrupting rating for unit fuses shall be presented as the kilojoules of parallel energy the fuse is capable of interrupting. If the tests are made at a frequency and/or voltage different than that specified in 6.10 of IEEE Std C37.41-2000, this data shall also be presented.




Annex A (informative) Bibliography [B1] IEEE Std C37.45 ™-2006, IEEE Standard Specifications for High-Voltage Distribution Class Enclosed Single-Pole Air Switches with Rated Voltages from 1 kV through 8.3 kV. 8, 9

8

IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 08854, USA (http://standards.ieee.org/). 9 The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers, Inc.



IEEE C37.43.2008

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