IEC 60255-5 pdf download – Electrical relays – Part 5: Insulation coordination for measuring relays and protection equipment – Requirements and tests

IEC 60255-5 pdf download – Electrical relays – Part 5: Insulation coordination for measuring relays and protection equipment – Requirements and tests
1Scope and object
This part of lEC 60255 gives general requirements for the insulation coordination ofmeasuring relays and protection equipment.
NOTE 1 Unless otherwise stated，the term “relay(s)” is used as an abbreviation for the expression ‘measuringrelays and pratectian equipment in this standard.
ln particular, this standard, specifies the following:- definition of terms;
guidance for the selection of clearances and creepage distances and other aspectsrelated to the insulation of measuring relays and protection equipment;
requirements for voltage tests and insulation resistance measurement.
This standard is applicable to the installation and use at altitudes up to 2 000 m of equipmenthaving a rated a.c. voltage up to 1 000 V, with a rated frequency up to 65 Hz, or a d.c. voltageup to 1 500 v.
This standard also applies to associated auxiliary devices such as shunts，series resistors,transformers,etc.,used and tested together with measuring relays and protection equipmentas mentioned above，except where the devices are covered by other lEC publications，forexample communication interfaces.
NOTE 2 Requiremens for altitudes esceeding 2 000 m can be derivwed from table B.1.2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of IEC60255. For dated references，subsequentamendments to,or revisions of,any of these publications do not apply. However,parties toagreements based on this part of lEC 60255 are encouraged to investigate the possibility ofapplying the most recent editions of the normative documents indicated below.For undatedreferences, the latest edition of the normative document referred to applies. Members of ISoand lEC maintain regislers of currently valid lnternational Standards.
IEC 60050(151):1978，International Electrotechnical Vocabulary (IEV) – Chapter 151: Electricaland magnetic devices
IEC 60050(448):1995, International Electrotechnical Vocabulary – Chapter 448:Power systemprofection
IlEC 60060-1:1989，High-voltage test techniques – Part 1: General definitions and testrequiremenis
IEC 60085:1984，Thermal evaluation and classification of electrical insulation
CEI 60255-21-2:1988，Relais électriques – Partie 21: Essais de vibrations，de chocs，desecousses et de tenue aux seismes ‘applicables aux relais de mesure et aux dispositifs deprotection – Section 2: Essais de chocs et de secousses
CEI 60255-21-3:1993，Relais électriques – Partie 21: Essais de vibrations,de chocs,desecousses et de tenue aux seismes ‘applicables aux relais de mesure et aux dispositifs deprotection – Section 3: Essais de tenue aux seismes
CEl 60664-1:1992,Coordination de “isolement des matériels dans les systemes (reseaux)abasse tension – Partie 1: Principes, prescriptions et essais
CEI 61000-4-5:1995,Compatibilite électromagnetique (CEM) – Partie 4:Techniques dessai etde mesure – Section 5: Essai d’immunité aux ondes de choc
CEl 61180-1:1992,Techniques des essais a haute tension pour matériels a basse tension -Partie 1 : Definitions, prescriptions et modalités relatives aux essais
CEl 61180-2:1994,Techniques des essais a haute tension pour matériels a basse tension -Partie 2: Materiel d’essai
3Definitions
Pour les besoins de la présente partie de la CEI 60255,les definitions suivantes ainsi quecelles de la CEl 60050(448), de la CEI 60664-1 et des parties appropriees de la CEl 60255s”appliquent.
3.1
partie active dangereuse
partie a un potentiel supérieur a 50 v efficaces ou 75 V c.c.
3.2
partie conductrice accessible
partie conductrice pouvant étre facilement touchee et qui n’est pas normalement une partieactive dangereuse mais qui peut se trouver a un potentiel dangereux en cas de premier defautNOTE 1 Pour les relais sans enveloppe，le chassis，les dispositifs de fixation，etc. constituent les partesconductrices accessibles.
NOTE2 Pour les relais installes dans une enveloppe， les parties conductrices qui sont accessibles lorsque lerelais est monte dans sa position normale d utilisation,y compris celles de sa surface de fixation,constituent lesparties conductrices accessibles. Les petites pieces telles que plaques signaletiques, vis et rivets qui sont isoleesdes circuits ne sont pas prises en consideration.
3.3
distance d’isolement
distance la plus courte dans l’air entre deux parties conductrices[CEI60664-1]
3.4
isolation solide
materiau isolant solide place entre deux parties conductrices[CEI60664-1]