SIST EN 60931-3:1999

Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV -- Part 3: Internal fuses

Applies to internal fuses which are designed to isolate faulty capacitor elements or capacitor unit, in order to allow operation of the remaining parts of that capacitor unit and the bank. Such fuses are not a substitute for a switching device such as a circuit-breaker, or for external protection of the capacitor bank.

Nichtselbstheilende Leistungs-Parallelkondensatoren für Wechselstromanlagen mit einer Nennspannung bis 1 kV -- Teil 3: Eingebaute Sicherungen

Condensateurs shunt de puissance non autorégénérateurs pour réseaux à courant alternatif de tension assignée inférieure ou égale à 1 kV -- Partie 3: Fusibles internes

S'applique aux fusibles internes qui sont destinés à isoler les éléments en défaut d'un condensateur ou le condensateur unitaire, et permettre ainsi le maintien en service de la partie saine de l'unité et de la batterie. Ils ne sont pas destinés à se substituer à un dispositif de coupure, par exemple un disjoncteur ou une protection externe de la batterie de condensateurs.

Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV -- Part 3: Internal fuses (IEC 60931-3:1996)

General Information

• Status: Published
• Publication Date: 30-Jun-1999
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 31.060.70 - Power capacitors
• Technical Committee: ETC - Electrotechnical technical committe
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-1999
• Due Date: 01-Jul-1999
• Completion Date: 01-Jul-1999
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 73/23/EEC - Electrical equipment designed for use within certain voltage limits
• Ref Project: EN 60931-3:1996 - Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV - Part 3: Internal fuses

Overview

EN 60931-3:1996 (CLC adoption of IEC 931-3:1996) specifies requirements and test methods for internal fuses fitted to shunt power capacitors of the non‑self‑healing type for a.c. systems with rated voltage up to and including 1 kV. The standard addresses fuse design, performance, routine and type testing, and gives guidance for coordinating fuse protection in capacitor units and banks. It clarifies that internal fuses are intended to isolate faulty capacitor elements to allow continued operation of the remaining unit or bank and are not a substitute for circuit‑breakers or external protection.

Key topics and technical requirements

• Scope & objective: Defines fuses that isolate faulty elements/units so the rest of the capacitor unit/bank can continue in service; includes performance, testing and coordination guidance.
• Reference: Uses definitions and general capacitor requirements from IEC/EN 60931‑1 (IEC 931‑1).
• Disconnecting requirements: Fuses must reliably disconnect a faulty element for breakdown voltages in a defined range (based on instantaneous terminal voltages at fault).
• Withstand & continuous ratings:
  • After operation, fuse assemblies must withstand full element voltage plus any unbalance and normal transient overvoltages.
  • Must carry continuous maximum permissible unit current (divided among parallel fuses) and expected inrush currents.
  • Must tolerate discharge currents and short‑circuit currents from external bank faults within the specified voltage range.
• Testing:
  • Routine tests: As part of capacitor unit routine tests per IEC 60931‑1.
  • Type tests: Include disconnecting tests; may be done on one or two complete units at lower (0.9 × UN) and upper (1.6 × UN) voltage limits. If testing with d.c., use 2 × corresponding a.c. voltage.
  • Disconnecting test details: Capacitance measurement after test to confirm blown fuse; inspection for deformation/damage; post‑test voltage test (d.c. 2.6 × UNe for 10 s) to verify no breakdown across blown fuse gap.
• Test procedures (Annex A): Practical methods for triggering element failure (preheating, mechanical puncture, electrical breakdown variants) and recording voltage/current during tests.
• Coordination guidance (Annex B): Recommended protection sequence - internal fuses first, relay protection second (overcurrent/unbalance), then network/plant protection.

Applications and users

• Manufacturer product design & certification: Capacitor and fuse manufacturers use EN 60931‑3 for product specifications and type‑testing.
• Test laboratories: Implement required routine and type test procedures and verification steps.
• Specifiers and purchasers: Utilities, industrial plant engineers, and consultants use the standard to define acceptance criteria and coordinate capacitor bank protection.
• Power system designers: Engineers designing power factor correction banks, switchgear and protection schemes to ensure selective and safe operation.

Related standards

• EN/IEC 60931‑1 (IEC 931‑1) - General performance, testing, rating and safety requirements for non‑self‑healing shunt power capacitors.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Shunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV -- Part 3: Internal fuses (IEC 60931-3:1996)Nichtselbstheilende Leistungs-Parallelkondensatoren für Wechselstromanlagen mit einer Nennspannung bis 1 kV -- Teil 3: Eingebaute SicherungenCondensateurs shunt de puissance non autorégénérateurs pour réseaux à courant alternatif de tension assignée inférieure ou égale à 1 kV -- Partie 3: Fusibles internesShunt power capacitors of the non-self-healing type for a.c. systems having a rated voltage up to and including 1 kV -- Part 3: Internal fuses31.060.70Power capacitors29.120.50Fuses and other overcurrent protection devicesICS:Ta slovenski standard je istoveten z:EN 60931-3:1996SIST EN 60931-3:1999en01-julij-1999SIST EN 60931-3:1999SLOVENSKI
STANDARD
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD931-3Première éditionFirst edition1996-08Ó CEI 1996
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catalogueKCondensateurs shunt de puissance nonautorégénérateurs pour réseaux à courantalternatif de tension assignée inférieure ou égale à1 000 V –Partie 3:Fusibles internesShunt power capacitors of the non-self-healingtype for a.c. systems having a rated voltage up toand including 1 000 V –Part 3:Internal fuses

931-3 ã IEC:1996- 3 -CONTENTSPageFOREWORD.5Clause1Scope and object.72Normative reference.73Definitions.74Performance requirements.74.1General.74.2Disconnecting requirements.94.3Withstand requirements.95Tests.95.1Routine tests.95.2Type tests.115.3Disconnecting test on fuses.11AnnexesATest procedures for the disconnecting test on internal fuses.15BGuide for coordination of fuse protection.19

931-3 ã IEC:1996- 5 -INTERNATIONAL ELECTROTECHNICAL COMMISSION_________SHUNT POWER CAPACITORS OF THE NON-SELF-HEALING TYPEFOR AC SYSTEMS HAVING A RATED VOLTAGEUP TO AND INCLUDING 1 000 V –Part 3: Internal fusesFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcomprising all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international co-operation on all questions concerning standardization in the electrical and electronicfields. To this end and in addition to other activities, the IEC publishes International Standards. Theirpreparation is entrusted to technical committees; any IEC National Committee interested in the subject dealtwith may participate in this preparatory work. International, governmental and non-governmental organizationsliaising with the IEC also participate in this preparation. The IEC collaborates closely with the InternationalOrganization for Standardization (ISO) in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters, express as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in theform of standards, technical reports or guides and they are accepted by the National Committees in thatsense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be thesubject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 931-3 has been prepared by IEC technical committee 33: Powercapacitors.The text of this standard is based on the following documents:FDISReport on voting33/223/FDIS33/246/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.Annex A forms an integral part of this standard.Annex B is for information only.This publication, together with IEC 60871-4 (1996), cancels and replaces IEC 60593 (1977).

931-3 ã IEC:1996- 7 -SHUNT POWER CAPACITORS OF THE NON-SELF-HEALING TYPEFOR AC SYSTEMS HAVING A RATED VOLTAGEUP TO AND INCLUDING 1 000 V –Part 3: Internal fuses1 Scope and objectThis part of IEC 931 applies to internal fuses which are designed to isolate faulty capacitorelements or a capacitor unit, in order to allow operation of the remaining parts of that capacitorunit and the bank in which the capacitor unit is connected. Such fuses are not a substitute for aswitching device such as a circuit-breaker, or for external protection of the capacitor bank orany part thereof.The object of this part of IEC 931 is to formulate requirements regarding performance andtesting and to provide a guide for co-ordination of fuse protection.2 Normative referenceThe following normative document contains provisions which, through reference in this text,constitute provisions of this part of IEC 931. At the time of publication, the edition indicated wasvalid. All normative documents are subject to revision, and parties to agreements based on thispart of IEC 931 are encouraged to investigate the possibility of applying the most recent editionof the normative document indicated below. Members of IEC and ISO maintain registers ofcurrently valid International Standards.IEC 931-1: 1989, Shunt power capacitors of the non-self-healing type for a.c. systems having arated voltage up to and including 1 000 V -
Part 1: General - Performance, testing and rating-
Safety requirements - Guide for installation and operationAmendment 1 (1991)3 DefinitionsFor the purpose of this part of IEC 931, the definitions of IEC 931-1 apply.4 Performance requirements4.1 GeneralThe fuse is connected in series to the element(s) which the fuse is intended to isolate if theelement(s) becomes faulty. The range of currents and voltages for the fuse is thereforedependent on the capacitor design, and in some cases also on the bank in which the fuse isconnected.

931-3 ã IEC:1996- 9 -The requirements are valid for a bank or a capacitor switched by restrike-free circuit-breakers.If the circuit-breakers are not restrike-free, other requirements shall be agreed betweenmanufacturer and purchaser.The operation of an internal fuse is in general determined by one or both of the two followingfactors:-the discharge energy from elements or units connected in parallel with the faulty elementor unit;-the power-frequency fault current.4.2 Disconnecting requirementsThe fuse shall enable the faulty element to be disconnected when electrical breakdownof elements occurs in a voltage range, in which uU1N0,92=´ is the lowest, anduU2N1,52=´ is the highest (instantaneous) value of the voltage between the terminals of theunit at the instant of fault.The u1 and u2 values are based on the voltage that may normally occur across the capacitorunit terminals at the instant of electrical breakdown of the element.The u2 value is of a transient nature and allowance has been made for damping.If the purchaser specifies u1 and u2 values other than those indicated, for example for filtercapacitors, the lower and upper test voltage limits shall be changed according to an agreementbetween manufacturer and purchaser.4.3 Withstand requirements4.3.1After operation, the fuse assembly shall withstand full element voltage or full voltagebe
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