Aerospace series - Cables, electrical, aircraft use - Test methods - Part 604: Resistance to dry arc propagation

This European standard specifies a method for appraising the behaviour of cable insulation when an electric arc is initiated and maintained by two powered cables rubbing against a blade.
This European Standard shall be used together with EN 3475 100.
The primary aim of this test is:
—   to produce, in a controlled fashion, continuous failure effects which are representative of those which may occur in service when a typical cable bundle is damaged by abrasion such that electrical arcing occurs, both between cables and between cables and conductive structure, and
—   to examine the aptitude of the insulation to track, to propagate electric arc to the electrical origin.
Originally defined for 115 Vac network, this test also proposes conditions for 230 Vac network. Unless otherwise specified in product standard, only 115 Vac conditions shall be satisfied.
Six levels of prospective fault current have been specified for concerned cable sizes (see Clause 7). It is generally agreed that larger sizes need not be assessed since the short-circuit phenomenon becomes dominant at low line impedances.
Unless otherwise specified in the technical/product standard sizes 002, 006 and 020 cable shall be assessed.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 604: Lichtbogenfestigkeit, trocken

Diese Europäische Norm legt ein Verfahren zur Beurteilung des Verhaltens der Isolierung einer Leitung gegenüber einem elektrischen Lichtbogen fest, der durch eine Verunreinigungsflüssigkeit entlang der Ober-fläche der Isolierung erzeugt und aufrechterhalten wird.
Diese Europäische Norm ist in Verbindung mit EN 3475-100 anzuwenden.
Der Hauptzweck dieser Prüfung besteht darin,
- auf geregelte Weise kontinuierliche Fehlereffekte zu erzeugen, die repräsentativ sind für solche, wie sie im Betrieb auftreten können, wenn ein typisches Leitungsbündel beschädigt und einer Verunreinigung durch wässrige Flüssigkeit ausgesetzt wird. Der elektrische Lichtbogen entsteht entlang der Oberfläche der Isolierung zwischen beschädigten Stellen an benachbarten Leitungen, und
- die Eignung der Isolierung dahingehend zu untersuchen, die Fortpflanzung des elektrischen Lichtbogens zum elektrischen Ausgangspunkt zurückzuverfolgen.
Ursprünglich für das 115-V-Wechselspannung-Netz festgelegt, deckt diese Prüfung auch Bedingungen für das 230-V-Wechselspannung-Netz ab. Sofern nicht anders in der Produktnorm festgelegt, müssen nur die 115-V-Wechselspannung-Bedingungen erfüllt werden.
Sechs (6) voraussichtliche Fehlerstromwerte wurden für die betreffenden Leitungsgrößen (siehe Ab-schnitt 7) festgelegt. Es wurde vereinbart, dass Größen, die größer als 051 sind, nicht bewertet werden, da das Kurzschlussphänomen bei niedrigen Leitungsimpedanzen vorherrscht.
Sofern nicht anders in den technischen Normen/Produktnormen festgelegt, sind Leitungen der Größen 002, 006 und 020 zu bewerten.

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d’essais - Partie 604 : Résistance à l'amorçage et à la propagation d'arc électrique, essai à sec

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 604. del: Odpornost proti električnemu obloku v suhih razmerah

General Information

Status
Published
Publication Date
04-Feb-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Jan-2018
Due Date
30-Mar-2018
Completion Date
05-Feb-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 604: Lichtbogenfestigkeit, trockenSérie aérospatiale - Câbles électriques à usage aéronautique - Méthodes d’essais - Partie 604 : Résistance à l'amorçage et à la propagation d'arc électrique, essai à secAerospace series - Cables, electrical, aircraft use - Test methods - Part 604: Resistance to dry arc propagation49.060Aerospace electric equipment and systems29.060.20KabliCablesICS:Ta slovenski standard je istoveten z:EN 3475-604:2018SIST EN 3475-604:2018en,fr,de01-marec-2018SIST EN 3475-604:2018SLOVENSKI

STANDARDSIST EN 3475-604:20101DGRPHãþD
SIST EN 3475-604:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3475-604
January
t r s z ICS
v {ä r x r Supersedes EN
u v y wæ x r vã t r s rEnglish Version
Aerospace series æ Cablesá electricalá aircraft use æ Test methods æ Part

x r vã Resistance to dry arc propagation Série aérospatiale æ Câbles électriques à usage aéronautique æ Méthodes d 5essais æ Partie

x r v ã Résistance à l 5amorçage et à la propagation d 5arc électriqueá essai à sec

Luftæ und Raumfahrt æ Elektrische Leitungen für Luftfahrtverwendung æ Prüfverfahren æ Teil

x r vã Lichtbogenfestigkeitá trocken This European Standard was approved by CEN on

t z August
t r s yä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

u v y wæ x r vã t r s z ESIST EN 3475-604:2018

EN 3475-604:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 3 1 Scope .................................................................................................................................................................... 4 2 Normative references .................................................................................................................................... 4 3 Specimen requirements ................................................................................................................................ 4 4 Preparation of specimen .............................................................................................................................. 5 5 Apparatus ........................................................................................................................................................... 6 6 Method ............................................................................................................................................................. 10 7 Requirements ................................................................................................................................................ 13 SIST EN 3475-604:2018

EN 3475-604:2018 (E) 3 European foreword This document (EN 3475-604:2018) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2018, and conflicting national standards shall be withdrawn at the latest by July 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3475-604:2010. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SIST EN 3475-604:2018

EN 3475-604:2018 (E) 4 1 Scope This European standard specifies a method for appraising the behaviour of cable insulation when an electric arc is initiated and maintained by two (2) powered cables rubbing against a blade. This European standard shall be used together with EN 3475-100. The primary aim of this test is:  to produce, in a controlled fashion, continuous failure effects which are representative of those which may occur in service when a typical cable bundle is damaged by abrasion such that electrical arcing occurs, both between cables and between cables and conductive structure, and  to examine the aptitude of the insulation to track, to propagate electric arc

to the electrical origin. Originally defined for 115 Vac network, this test also proposes conditions for 230 Vac network. Unless otherwise specified in product standard, only 115 Vac conditions shall be satisfied. Six (6) levels of prospective fault current have been specified for concerned cable sizes (see Clause 7). It is generally agreed that larger sizes need not be assessed since the short-circuit phenomenon becomes dominant at low line impedances. Unless otherwise specified in the technical/product standard sizes 002, 006 and 020 cable shall be assessed. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2350, Aerospace series — Circuit breakers — Technical specification EN 2702, Aerospace series — Aluminium alloy AL-P6061 — T6 or T62 — Drawn or extruded bar and section — a or D ≤ 200 mm EN 3197, Aerospace series — Design and installation of aircraft electrical and optical interconnection systems EN 3475-100, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 100: General EN 3475-302, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 302: Voltage proof test A-A-52083, Tape, lacing and tying, glass 1) 3 Specimen requirements Cables to be tested shall be of traceable origin and shall have passed the high voltage dielectric test defined in the product standard.

1) Published by: Department of Defense Industrial Supply Center, ATTN: DISC-BBEE, 700 Robbins Avenue, Philadelphia, PA 19111-5096 – USA. SIST EN 3475-604:2018

EN 3475-604:2018 (E) 5 4 Preparation of specimen 4.1 Cut seven (7) separate lengths of approximately 0,5 m consecutively from one length of cable, and strip each of the ends of insulation to permit electrical connection. Clean each length of cable with a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid. 4.2 Lay up the seven (7) cables as follows: a) Form the cables in a six around one configuration as shown in Figure 1. b) Ensure that all cables are straight and geometrically parallel, and restrained by lacing tapes such that they are in continuous contact for at least a 75 mm continuous length around the mid point of the loom length. This is called the test zone. c) Position the lacing tapes at 15 mm to 20 mm spacing within the test zone. The tie material shall be PTFE glass lacing tape conforming to A-A-52083 type IV, finish D, size 3. d) Number the cables as shown in Figure 1 such that the cables in contact with the blade are numbers A1 and B1. Test Blade

Key 1 Original position 2 Final position A1-A2 : Phase A B1-B2 : Phase B C1-C2 : Phase C N1-N2 : Inactive cables connected to earth Figure 1 — Specimen configuration

SIST EN 3475-604:2018

EN 3475-604:2018 (E) 6 5 Apparatus 5.1 Electrical equipment Connect the seven (7) cables of the test sample within a circuit as shown in Figure 2. This circuit shall have the following requirements: a) The provision of adjustable levels of prospective fault currents for the five A, B and C cables and an electrical return path for the two N cables. b) A three phase 115/200 V 400 Hz (115 Vac network) or 230/400 V 400 Hz (230 Vac network) star (Y) connected supply shall be derived from a dedicated rotary machine capable of sustaining the maximum prospective fault current given in Table 1 (115 Vac network) or Table 2 (230 Vac network) for at least sufficient time for circuit protection to operate. In any case the generator shall have a sufficient rating to provide these prospective fault currents. c) 115 Vac or 230 Vac circuit breakers (D2) shall be single pole units rated at the values specified in Table 3.

They shall have trip characteristics in accordance with EN 2350 or as required in the product specification. NOTE 1 Reference of circuit breakers used shall be recorded. NOTE 2 In particular case, others ratings of thermal breaker protection could be employed in accordance with aircraft manufacturer rules. d) The electrical power source shall be appropriately protected and it shall be established that no combination of test circuit events would activate this protection. e) The ballast resistors shall be non-inductive and of appropriate powe

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