ASD-STAN PREN 2591-227-2014 Aerospace series Elements of electrical and optical connection Test methods Part 227 Partial discharges test (Edition P 1).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2591-227 Edition P 1 March 2014 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: 49.060 Descriptors: ENGLISH

2、VERSION Aerospace series Elements of electrical and optical connection Test methods Part 227: Partial discharges test Srie arospatiale Organes de connexion lectrique et optique Mthodes dessais Partie 227 : Essai de dcharges partielles Luft- und Raumfahrt Elektrische und optische Verbindungselemente

3、Prfverfahren Teil 227: Teilentladungsprfung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technic

4、ally approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After

5、 examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at nat

6、ional level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st March 2014 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2014 by AS

7、D-STAN prEN 2591-227:2014 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Abbreviations and definitions 4 4 Applicability 4 5 Apparatus . 4 6 Test methods . 5 7 Procedure . 9 8 Pass fail criteria . 9 9 Test report 10 Foreword This standard was reviewed by the Domain Technical Coo

8、rdinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2591-227:2014 (E) 3 Introduction For a connector, the presence of partial dis

9、charge effects at operating voltage may result in a significant reduction of service life. Evidence of partial discharges during operation signifies for example: Distance between contact cavities is insufficient for the applied voltage, The quality of the insulation is inadequate possibly due to exc

10、essive size of the cavities or voids inside the insulation, A leakage way is present, resulting in a local reduction of the connector insulation properties. The most significant parameters which may influence PDIV, are, when both low pressure and high temperature could be combined (engine area for e

11、xample). The aim of this standard is to define the test method and procedure which will determine if an electrical connector will be subjected to partial discharges; in particularly, when it is exposed to a specified temperature and pressure based on an Aircraft environment. 1 Scope This test standa

12、rd defines methods to measure the partial discharge inception/extinction voltages (PDIV, PDEV) and partial discharge levels under specific temperatures and pressures on an electrical connector for aircraft use. It shall be use together with EN 2591-100. 2 Normative references The following documents

13、, 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 2267-012, Aerospace series

14、Cables, electrical, for general purpose Operating temperatures between 55 C and 260 C Part 012: DZ family, single UV laser printable for use in low pressure atmosphere Product standard 1) EN 2591-100, Aerospace series Elements of electrical and optical connection Test methods Part 100: General EN 31

15、55 (all parts), Aerospace series Electrical contacts used in elements of connection EN 60270, High-voltage test techniques Partial discharge measurements ASTM D 1868-07, Standard Test Method for Detection and Measurement of Partial Discharge (Corona) Pulses in Evaluation of Insulation Systems 2) 1)

16、Published as ASD-STAN Prestandard at the date of publication of this standard. http:/www.asd-stan.org/ 2) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/ prEN 2591-227:2014 (E) 4 3 Abbreviations and definitions DUT Device Under Test PD Partial Discharg

17、es For the purpose of this document, the following abbreviations shall be used: PDIV Partial Discharge Inception Voltage PDEV Partial Discharge Extinction Voltage PDIV is the lowest voltage at which continuous partial discharges occur as the applied voltage is increased. PDEV is the highest voltage

18、at which partial discharges no longer occur as the applied voltage is decreased from the inception voltage described before. More precise information on the partial discharge phenomenon can be found in ASTM D 1868-07 or in EN 60270. One definition of partial discharge can be found in 3.1.2 of the AS

19、TM D 1868-07. Test specimen or DUT: It is a connector (plug or receptacle) compliant to a required definition and configuration. 4 Applicability This test method is suitable for all types of connector used in un-pressurized area. 5 Apparatus The detection equipment shall be capable of detecting part

20、ial discharges of five (5) picocoulombs (pC) or less. The detection equipment, cautions and measurement procedures shall be equivalent to those described in ASTM D 1868-07 or in EN 60270. The frequency of the test voltage shall be between 48 Hz and 62 Hz, unless otherwise specified by the technical

21、specification. The apparatus must be capable to generate a combination of low pressure and high temperature, refer to Figure 1. prEN 2591-227:2014 (E) 5 Key 1 Monitoring 2 Power supply & DP monitoring 3 High immunity cables 4 High voltage wires 5 Temperature 6 Pressure 7 DUT (Device Under Test) 8 Cl

22、imatic chamber 9 Vacuum pump Figure 1 Example of apparatus principle 6 Test methods All contacts shall be wired with a wire qualified for high voltage purpose (use of EN 2267-012 standard or similar is recommended). Measurements shall be performed between the contact inside the concerned cavity and

23、all others surrounding contacts linked together with the shell, if the shell is conductive. All cavities to test shall take into account the minimum separation distance between them or/and the shell, if the shell is conductive. It is particularly important that the end of the connected wire shall be

24、 made of corona free by the help of additional insulation or separation. In order to do not disturb the electrical measurements, inside the climatic chamber, it is important to use high immunity cable (i.e: shielded cables) to ensure the connections between the test specimen and the electrical devic

25、es. Therefore the utilization of sharp gripping devices such as crocodile pliers are forbidden for the high immunity cable links. No cable outlet accessories shall be used as bending and squeezing of the connected wires could be a source of partial discharge and not related to the test specimen itse

26、lf. prEN 2591-227:2014 (E) 6 6.1 Test Method A: Un-mated configuration The plug and receptacle connector test specimens shall be un-mated as the connectors used in un-pressurized areas, are sealed version and when they are mated, the sealing provides a barrier preventing that the pressure inside the

27、 cavities of the connectors will not be at the same level as the outside pressure. Consequently, un-mated connector test specimen (plug or receptacle) using a wired female contacts will allow a uniform pressure inside (P0) and outside (P1) the connector cavities, refer to Figure 2 a). However, the u

28、n-mated connector test specimen (plug or receptacle) using a wired male contacts, due to the interfacial seal, the front end of the male contacts (active area) shall be removed to guaranty the low pressure inside the contact cavities (P0) and obtain uniform pressure with (P1), refer to Figure 2 b).

29、Electrical contacts used in the test specimens must be representative of EN 3155 standard contacts. Key 1 Connector (Plug or receptacle) 2 Wire 3 Pressure P1 4 Pressure P0 5 Female contact a) Wired female contacts Key 1 Connector (Plug or receptacle) 2 Wire 3 Pressure P1 4 Pressure P0 5 Male contact

30、s with removed front end b) Wired male contacts Figure 2 Un-mated connector prEN 2591-227:2014 (E) 7 6.2 Test method B: Mated configuration Plug and receptacle connector test specimens shall be mated. Electrical contacts used in the test specimens must be representative of EN 3155 standard contacts,

31、 moreover. In order to guaranty the low pressure inside the contact cavity: For female and male contacts not requiring a sealing sleeves, the female and male contacts must be longitudinally drilled over the center axis. For female and male contacts (i.e: Size #8) requiring a sealing sleeves in basel

32、ine configuration, the sealing sleeves must be removed and the contacts must not be longitudinally drilled over the center axis. Four (4) configurations are possible: a) Only male contacts are wired and drilled. There is no seal barrier except at the interfacial seal and at the rear of the receptacl

33、e connector. Therefore, the pressure balance can be achieved by the rear of the plug connector through the drilled and un-wired female contacts, refer to Figure 3. b) Only female contacts are wired and drilled. There is no seal barrier except at the interfacial seal and at the rear of the receptacle

34、 connector. Therefore, the pressure balance can be achieved by the rear of the plug connector through the drilled and un-wired male contacts, refer to Figure 4. c) Only male contacts are wired and the sealing sleeve (i.e: as required in baseline configuration for size #8) must be removed for achievi

35、ng the test. There is no seal barrier except at the interfacial seal. Therefore, the pressure balance can be achieved by the rear of the plug and by the rear of the receptacle connectors, as no sealing sleeve is used. d) Only female contacts are wired and the sealing sleeve (i.e: as required in base

36、line configuration for size #8) must be removed for achieving the test. There is no seal barrier except at the interfacial seal. Therefore, the pressure balance can be achieved by the rear of the plug connector and by the rear of the receptacle connectors, as no sealing sleeve is used. prEN 2591-227

37、:2014 (E) 8 Key 1 Receptacle connector 2 Plug connector 3 Male/Female contacts longitudinally drilled 4 Wire Figure 3 Mated connectors and wired male contacts Key 1 Receptacle connector 2 Plug connector 3 Male/Female contacts longitudinally drilled 4 Wire Figure 4 Mated connectors and wired female c

38、ontacts prEN 2591-227:2014 (E) 9 7 Procedure WARNING Lethal voltage may be present during this test. It is essential that procedures and test apparatus be properly defined and used for safe operations. Unless otherwise specified in the concerned product standard, at least three (3) different test sp

39、ecimens shall be tested. The test shall be carried out according EN 60270 and in accordance with the following steps: 1) Connect the connector test specimen to the voltage source. 2) Set up the temperature and the pressure at the values specified in the technical specification. 3) Stabilize the temp

40、erature and pressure at the specified values. Pass/Fail Criteria of minimum PDIV: 4) Apply the test voltage as defined in the technical specification during one (1) minute and verify that the specified conditions (see Note 1) are not reached. Determination (see Note 3) of the PDIV: 5) Increase progr

41、essively the voltage up to reach the specified conditions (see Note 1) and record PDIV. Determination (see Note 3) of the PDEV: 6) Increase voltage by applying 50 Vrms to confirm the specify conditions (see Note 1). Then decrease the voltage down to PD full extinction (see Note 2) and record the PDE

42、V. 7) Reduce the voltage down to 0V. 8) Repeat the test sequences from step 4 to step 7 up to 9 times to obtain in total 10 measurements for each required cavity, unless otherwise specified in the technical specification. NOTE 1 Specified conditions are: Detection level of PD 5pC max. A steady state

43、 of at least 30 partial discharges in 30 s. NOTE 2 No detection of DP (5pC max.) during 10 s. NOTE 3 Required for test qualification, and optional for manufacturing test control. 8 Pass fail criteria The PDIV threshold shall be greater than the value specified in technical specification. The PDEV th

44、reshold shall be greater than value specified in technical specification. prEN 2591-227:2014 (E) 10 9 Test report The following details shall be stated in the test report: Test method (A or B), Type of wires: Crimped on connector contacts, Used to connect the test specimens. For each measurement the below data must be recorded: Test specimen and cavity references (i.e: connector part number and cavity identification of the connector), Pass/Fail status (PDIV and PDEV), Air pressure, temperature, PDIV, PD (of PDIV), PDEV.