1、BRITISH STANDARDBS EN 60255-22-2:2008Measuring relays and protection equipment Part 22-2: Electrical disturbance tests Electrostatic discharge testsICS 29.120.70g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g4
2、4g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60255-22-2:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2008ISBN 978 0 580 58840 2National forewordThis British Standard is the UK implementation of EN
3、 60255-22-2:2008. It is identical to IEC 60255-22-2:2008. It supersedes BS EN 60255-22.2:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PEL/95, Measuring relays and protection systems.A list of organizations represented on this committee can be
4、obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicat
5、ionDate CommentsEUROPEAN STANDARD EN 60255-22-2 NORME EUROPENNE EUROPISCHE NORM June 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050
6、 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60255-22-2:2008 E ICS 29.120.70 Supersedes EN 60255-22-2:1996English version Measuring relays and protection equipment - Part 22-2: Electrical disturbance tests - Elec
7、trostatic discharge tests (IEC 60255-22-2:2008) Relais de mesure et dispositifs de protection - Partie 22-2: Essais dinfluence lectrique -Essais de dcharge lectrostatique (CEI 60255-22-2:2008) Messrelais und Schutzeinrichtungen - Teil 22-2: Prfungen der elektrischen Strfestigkeit - Prfungen mit elek
8、trostatischer Entladung(IEC 60255-22-2:2008) This European Standard was approved by CENELEC on 2008-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alte
9、ration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by t
10、ranslation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia
11、, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 95/227/FDIS, future edition 3 of IEC 60
12、255-22-2, prepared by IEC TC 95, Measuring relays and protection equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60255-22-2 on 2008-05-01. This European Standard supersedes EN 60255-22-2:1996. The main changes with respect to EN 60255-22-2:1996 are listed
13、below: the improvement of the scope and object; the improvement of the test severity level, test set-up and test report. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-0
14、2-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60255-22-2:2008 was approved by CENELEC as a European Standard without any modification.
15、_ 2 BS EN 60255-22-2:2008CONTENTS 1 2 3 4 5 6 7 8 9 3 BS EN 60255-22-2:2008Scope and object4 Normative references .4 Terms and definitions.5 Test severity level 5 Test equipment.6 Test set-up .6 Test procedures .8 Criteria for acceptance .10 Test report10 Annex A (informative) .11 Figure 1 Example o
16、f test set-up with EUT 8 Table 1 Test severity classes.6 Table 2 Criteria for acceptance 10 Annex ZA (normative) Normative references to international publications with their corresponding European publications.13MEASURING RELAYS AND PROTECTION EQUIPMENT Part 22-2: Electrical disturbance tests Elect
17、rostatic discharge tests 1 Scope and object This part of IEC 60255-22 is based on IEC 61000-4-2, referring to that publication where applicable, and specifies the general requirements for electrostatic discharge tests for measuring relays and protection equipment for power system protection, includi
18、ng the control, monitoring and process interface equipment used with those systems. The object of the tests is to confirm that the equipment being tested will not maloperate when energized and subjected to an electrostatic discharge. The requirements are applicable only to relays and protection equi
19、pment in new condition, and all tests specified are type tests only. The object of this standard is to state: definitions of terms used; test severity level; test equipment; test set-up; test procedures; criteria for acceptance; test report requirements. 2 Normative references The following referenc
20、ed documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document ( including any amendments) applies. IEC 60050-161, International Electrotechnical Vocabulary Chapter 161:
21、Electromagnetic compatibility IEC 60050-446, International Electrotechnical Vocabulary Chapter 446: Electrical relays IEC 60050-448, International Electrotechnical Vocabulary Chapter 448: Power system protection IEC 60255-6:1988, Electrical relays Part 6: Measuring relays and protection equipment IE
22、C 61000-4-2:1995, Electromagnetic compatibility (EMC) Part 4-2: Testing and measurement techniques Electrostatic discharge immunity test Amendment 1 (1998) Amendment 2 (2000) 4 BS EN 60255-22-2:20083 Terms and definitions For the purposes of this document, the terms and definitions in IEC 60050-161,
23、 IEC 60050-446 and IEC 60050-448 apply and, for special terms, IEC 61000-4-2 applies. 3.1 equipment under test EUT equipment which may be either a measuring relay or a protection equipment 3.2 contact discharge method method of testing, in which the electrode of the test generator is held in contact
24、 with the EUT, and the discharge to the EUT actuated by the discharge switch within the generator 3.3 air discharge method method of testing, in which the charged electrode of the test generator is approached to the EUT, and the discharge actuated by a spark to the EUT 3.4 direct application applica
25、tion of the test directly to the EUT 3.5 indirect application application of the test to a coupling plane in the vicinity of the EUT, and simulation of personal discharge to objects which are adjacent to the EUT 3.6 auxiliary equipment equipment necessary to provide the EUT with the signals required
26、 for normal operation, and equipment used to verify the performance of the EUT 4 Test severity level IEC 61000-4-2 makes reference to two test methods and two methods of application. These are: test methods: contact discharge, air discharge; applications: direct, indirect. Tests shall be applied as
27、follows: the contact discharge method is the preferred method; the air discharge method shall only be used when the accessible surfaces of the EUT are non-conducting; the direct application test method shall be used; the indirect method of application is not applicable when the EUT is intended to be
28、 mounted in a grounded cabinet. 5 BS EN 60255-22-2:2008To cover different environmental conditions, this standard includes different severity classes. General guidance for the selection of severity classes is given in Annex A. The test severity class shall be chosen from the following table. In this
29、 standard, the severity is expressed as the charging voltage of the energy storing capacitor in the discharge generator. Table 1 Test severity classes Class Test voltage (5 %) Contact discharge Air discharge 0 1 2 kV 2 kV 2 4 kV 4 kV 3 6 kV 8 kV 4 8 kV 15 kV Class 3 is the normal test severity class
30、 for measuring relays and protection equipment. Testing shall also be satisfied at the lower levels given in Table 1. NOTE 1 For situations involving a very severe electrostatic environment, testing with higher voltage levels than those specified in Class 4 is subject to agreement between the user a
31、nd manufacturer, or as defined by the manufacturer. If higher voltages than those shown are specified, special test equipment may be required. NOTE 2 For Classes 3 and 4, the test voltage levels for the contact discharge method are less than those for the air discharge method, due to the characteris
32、tics of the two test methods. It is not intended to imply that the test severity is equivalent between test methods. 5 Test equipment The recommended test equipment is described in IEC 61000-4-2. 6 Test set-up The test set-up consists of the test generator, the EUT, and auxiliary instrumentation nec
33、essary to perform direct discharges to the EUT, as applicable, in the following manner: a) contact discharge to conductive surfaces; b) air discharge at insulating surfaces. All tests shall be conducted in a test laboratory under the environmental reference conditions outlined in Clause 7. The EUT s
34、hall be tested in as close to installed conditions as possible. Wiring shall be consistent with the manufacturers recommended procedures, and the EUT shall be tested in its case or housing. All parts intended to be earthed shall be connected to the ground reference plane with copper straps (or coppe
35、r braid) of at least 20 mm width. A ground reference plane shall be provided on the floor of the laboratory or on the work bench. It shall be a metallic sheet (copper or aluminium) of 0,25 mm minimum thickness; other metallic materials may be used, but they shall be of at least 0,65 mm thickness. Th
36、e minimum size of the reference plane is 1 m2, the exact size depending on the dimensions of the EUT. It shall project beyond the EUT, or the coupling plane, by at least 0,5 m on all sides, 6 BS EN 60255-22-2:2008and shall be connected to the protective ground system. Local safety regulations shall
37、always be met. The EUT shall be placed on the ground reference plane, but distanced from it by means of at least 0,1 m thick insulation supports. The distance to walls and metallic structures shall be at least 1 m. Cables interconnecting the various parts of the EUT shall be kept at a distance of at
38、 least 0,1 m from the ground plane. The discharge generator shall be earthed via its discharge return cable directly to the ground reference plane, close to the EUT. The total length of this cable is in general 2 m. Where coupling planes are specified, for example to allow indirect application of th
39、e discharge, they shall be constructed from the same material type and thickness as that of the ground reference plane, and shall be connected to the ground reference plane via a cable with a 470 k resistor located at each end. These resistors shall be capable of withstanding the discharge voltage a
40、nd shall be insulated to avoid short circuits to the ground reference plane when the cable lies on the ground reference plane. An example of a test set-up is given in IEC 61000-4-2. If monitoring equipment is required, it should be decoupled in order to reduce the possibility of erroneous failure in
41、dication. An example of a test set-up is given in Figure 1. 7 BS EN 60255-22-2:2008Insulating supportPower supply 0,2 m 0,1 mEquipment under test Supply and monitoring equipment Discharge generator Ground reference plane IEC 529/08 Figure 1 Example of test set-up with EUT 7 Test procedures The tests
42、 shall be carried out with the equipment under reference conditions, as stated in the applicable clauses of IEC 60255-6. The tests shall be carried out with auxiliary energizing quantities and loading applied to the appropriate circuits, having values equal to rated conditions (see Note 1 below). Th
43、e value of the input energizing quantity shall be as close as possible to the transitional state, but not closer than the claimed variation due to electrostatic discharge disturbance. The settings and appropriate variations associated with the tests shall be declared by the manufacturer. NOTE 1 The
44、thermal withstand capability should be taken into consideration. NOTE 2 Since the coincidence of electrostatic discharge and a fault is considered to be extremely unlikely, the effect of the discharge on the relay in its transitional or operating condition is not considered. The points selected for
45、the application of the test shall be those which are accessible to the operator under normal service conditions, including communication ports and those points for 8 BS EN 60255-22-2:2008setting adjustments that can only be accessed by removing the relay cover. Setting adjustments which necessitate
46、any action other than removal of the cover, such as removal of a module, are not included. The application of discharge to any point of the equipment which is accessible only for repair and maintenance purposes is outwith the scope of this standard. In the selection of test points, attention shall b
47、e given to the following: knobs, push-buttons, switches, communication interface, etc., accessible under normal service; points on covers of insulating material where conducting parts are close to the inside of the cover; points on conducting parts not belonging to, but placed in the vicinity of, th
48、e EUT, when this has an insulating cover. To achieve reproducible results, it is recommended that the selected test points are specified by the manufacturer. The contact discharge method of testing (the preferred method) shall be applied to conductive surfaces of the EUT. The air discharge method sh
49、all only be used when the accessible surfaces of the EUT are non-conducting. The test voltage shall be increased from the minimum to the selected test level, in order to determine any threshold of failure. It is recommended that the discharge generator includes a monitor device for indication of the actual application of the discharge at the corresponding level. The test shall be performed with single discharges. It shall be repeated on each selecte
