1、BRITISH STANDARD BS EN 60255-22-7:2003 Electrical relays Part 22-7: Electrical disturbance tests for measuring relays and protection equipment Power frequency immunity tests The European Standard EN 60255-22-7:2003 has the status of a British Standard ICS 29.120.70 BS EN 60255-22-7:2003 This British
2、 Standard was published under the authority of the Standards Policy and Strategy Committee on 9 June 2003 BSI 9 June 2003 ISBN 0 580 41944 4 National foreword This British Standard is the official English language version of EN 60255-22-7:2003. It is identical with IEC 60255-22-7:2003 The UK partici
3、pation in its preparation was entrusted to Technical Committee PEL/95, Measuring relays and protection systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement i
4、nternational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not
5、purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enqu
6、iries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside
7、back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60255-22-7 NORME EUROPENNE EUROPISCHE NORM May 2003 CENELEC European Committee for Electrotechnic
8、al Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60
9、255-22-7:2003 E ICS 29.120.70 English version Electrical relays Part 22-7: Electrical disturbance tests for measuring relays and protection equipment - Power frequency immunity tests (IEC 60255-22-7:2003) Relais lectriques Partie 22-7: Essais dinfluence lectrique concernant les relais de mesure et d
10、ispositifs de protection - Essais dimmunit aux frquences industrielles (CEI 60255-22-7:2003) Elektrische Relais Teil 22-7: Prfungen der elektrischen Strfestigkeit von Messrelais und Schutzeinrichtungen - Prfung der Strfestigkeit gegen netzfrequente Strgren (IEC 60255-22-7:2003) This European Standar
11、d was approved by CENELEC on 2003-05-01. 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 alteration. Up-to-date lists and bibliographical references concerning
12、 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 translation under the responsibility of a CENELEC member into its o
13、wn 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherla
14、nds, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 95/154/FDIS, future edition 1 of IEC 60255-22-7, prepared by IEC TC 95, Measuring relays and protection equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC
15、as EN 60255-22-7 on 2003-05-01. 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) 2004-02-01 latest date by which the national standards conflicting with the EN have to be withd
16、rawn (dow) 2006-05-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Int
17、ernational Standard IEC 60255-22-7:2003 was approved by CENELEC as a European Standard without any modification. Page2 EN60255227:2003CONTENTS 1 Scope and object4 2 Normative references.4 3 Definitions5 4 Test severity levels.5 5 Test equipment.6 5.1 Test generator.6 5.2 Verification of the test gen
18、erator6 5.3 Coupling networks.7 6 Test set-up.7 6.1 Earthing connections.7 6.2 Auxiliary equipment.7 7 Test procedure.7 8 Criteria for acceptance.8 9 Test report8 Annex A (informative) Background information for power frequency tests 11 Annex ZA (normative) Normative references to international publ
19、ications with their corresponding European publications .12 Figure 1 Port tested in this standard for measuring relays and protection equipment .5 Figure 2 Example of Class A differential mode tests. .9 Figure 3 Example of Class B differential mode tests. .9 Figure 4 Example of common mode tests.10
20、Page3 EN60255227:2003062-5522-7 IEC:2003 4 ELECTRICAL RELAYS Part 22-7: Electrical disturbance tests for measuring relays and protection equipment Power frequency immunity tests 1 Scope and object This part of IEC 60255 is based on the concepts described in IEC 61000-4-16, referring to that publicat
21、ion where applicable, and specifies the general requirements for power frequency immunity tests for measuring relays and protection equipment for power system protection, including the control, monitoring and process interface equipment used with those systems. The objective of the tests is to confi
22、rm that the equipment under test (EUT) will operate correctly when energised and subjected to short duration, conducted, common and differential mode power frequency disturbances applied to DC status inputs, at the rated frequency of the EUT, for example 16 2 / 3Hz, 50 Hz and 60 Hz. The testing of p
23、ilot wire schemes between substations is not covered by this standard. The requirements specified in this standard are applicable to measuring relays and protection equipment in a new condition and all tests specified are type tests only. The object of this standard is to state: definitions of terms
24、 used; test severity levels; test equipment; test set-up; test procedures; criteria for acceptance; test report. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referen
25、ces, the latest edition of the referenced document (including any amendments) applies. IEC 60255-6:1988, Electrical relays Part 6: Measuring relays and protection equipment IEC 61000-4-16:2002, Electromagnetic Compatibility (EMC) Part 4-16: Testing and measurement techniques Test for immunity to con
26、ducted, common mode disturbances in the frequency range 0 Hz to 150 kHz Pa6eg EN60255227:2003Page4 EN60255227:200360255-22-7 IEC:2003 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 auxiliary equipment equipment necessary to provide the EUT
27、 with the signals required for normal operation and equipment to verify the performance of the EUT 3.2 EUT equipment under test, which may be either a measuring relay or protection equipment 3.3 DC status input port port through which the apparatus is controlled using a DC input in order to perform
28、its function(s) 3.4 port particular interface of the specified apparatus with the external electromagnetic environment DC status input port EUT Figure 1 Port tested in this standard for measuring relays and protection equipment 4 Test severity levels The test voltages and coupling networks for the D
29、C status input ports are shown in Table 1. As only short duration disturbances are considered here, the duration for each applied disturbance shall be at least 10 s. Table 1 Test voltages and coupling networks for DC status input ports Differential mode tests Common mode tests Coupling network Coupl
30、ing network Test level Open circuit test voltage 10 % V r.m.s. R 5 % C 5 % F Open circuit test voltage 10 % V r.m.s. R 5 % C 5 % F Class A 150 100 0,1 300 220 0,47 Class B 100 100 0,047 300 220 0,47 NOTE For matching of coupling network resistor and capacitor values, see 5.3. The differential mode t
31、est is not required on DC status input ports which, according to the manufacturers functional specification, always have an interface via multi-core screened or twisted pair (screened or unscreened) cables. IEC 1098/03 Page6 EN60225527:2003Page5 EN60255227:200360255-22-7 IEC:2003 6 Also, unless othe
32、rwise stated, no test is required for DC status input ports interfacing with cables whose total length according to the manufacturers functional specification is always less than 10 m. Class A test levels are applicable to substations with high earth fault currents, and where the standard wiring pra
33、ctices allows the DC status inputs to be wired to primary plant auxiliary contacts via open loops. An open loop occurs where the go and return leads are allowed in different multi-core cables, and therefore face the risk of following substantially different paths. This produces a large potential are
34、a of magnetic flux linkage with the primary earth fault current, which causes high levels of power frequency interference. Class B test levels are applicable to either: substations with low earth fault currents, for example substations which use isolated or Petersen coil earthing, or; where wiring p
35、ractice guarantees that the DC status inputs are not wired in open loops. Open loops are avoided by using the go and return wires in the same multi-core cable. This ensures that the go and return routes are essentially identical, and that the area of magnetic flux linkage with the primary earth faul
36、t current is small, thus minimising the levels of power frequency interference. 5 Test equipment Where the test frequency is not that of the available mains distribution network, an alternative test generator will have to be used, for example that described in 6.1.3 of IEC 61000-4-16. 5.1 Test gener
37、ator The test generator typically consists of a variable transformer connected to the mains distribution network and an isolation transformer. The generator should have the following characteristics: Waveform: Sinusoidal, total harmonic distortion less than 10 %. Open circuit output voltage range: 1
38、00 V to 300 V r.m.s. (10 %). Impedance: less than 150 . Frequency: Selected rated frequency (0,5 Hz). On/off output voltage switching: Synchronised at zero crossing (0 10) or increased from zero / decreased to zero (see clause 7). 5.2 Verification of the test generator In order to ensure that the re
39、sults when using different test generators can be meaningfully compared, the following characteristics of the generator shall be calibrated or verified: output voltage waveform; voltage generator impedance; frequency accuracy; open circuit output voltage accuracy. Page6 EN60255227:200360255-22-7 IEC
40、:2003 7 The verifications shall be carried out with a voltage probe and oscilloscope or other equivalent measurement instruments with a minimum bandwidth of 1 MHz. The accuracy of these instruments shall be better than 5 %. 5.3 Coupling networks The coupling networks enable the test voltage to be ap
41、plied in both common and differential mode, see Figures 2, 3 and 4 for typical test set-ups. The networks consist of a resistor and capacitor in series. The values for these components for the tests are shown in Table 1, and the values for each pair of capacitors and resistors should be matched with
42、 a tolerance of 1 %. 6 Test set-up Figures 2 and 3 show typical test set-ups for differential mode tests, and Figure 4 shows a typical test set-up for common mode tests. Connections between the EUT and the coupling network shall be less than 2 m. 6.1 Earthing connections The safety earthing requirem
43、ents of the EUT, the auxiliary equipment and of the test equipment shall be complied with at all times. Additionally, the EUT shall be connected to the earthing system in accordance with the manufacturers specifications. 6.2 Auxiliary equipment All auxiliary equipment, used to provide the EUT with s
44、ignals for normal operation, and to verify the EUTs correct operation, should be decoupled so that the test voltage does not affect the auxiliary equipment. Auxiliary equipment required for the defined operation of the EUT according to the specifications, e.g. communication equipment, modem, printer
45、, etc., as well as auxiliary equipment necessary for ensuring any data transfer and assessment of the functions, shall be connected to the EUT. However, as far as possible the number of cables to be monitored should be limited by restricting attention to the representative functions. 7 Test procedur
46、e The tests shall be carried out at the reference conditions given in IEC 60255-6. The tests shall be carried out with auxiliary energising quantities equal to rated values applied to the auxiliary power supply port. The test generator shall be connected to the DC status input port of the EUT. When
47、this port consists of multiple identical circuits, only a representative number of these circuits, as defined by the manufacturer, need to be tested in order to verify the correct operation of the EUT. The test voltage shall be applied for at least 10 s so that the EUTs operating performance can be
48、verified. The test voltage should be applied as shown in Figures 2, 3 and 4. Page7 EN60255227:2003062-5522-7 IEC:2003 8 When a test generator with zero crossing synchronisation is not available, in order to avoid unwanted transients at turn on and turn off, the test voltage may be increased from zer
49、o to the required level at the start of the test, and decreased to zero at the end of the test. The duration of these start and end phases shall not be included as part of the test time, and they should each have a duration of less than 20 % of the time of the application of the required test voltage. The test voltage shall only be appl
