1、BSI Standards PublicationMeasuring relays and protection equipmentPart 121: Functional requirements for distance protectionBS EN 60255-121:2014National forewordThis British Standard is the UK implementation of EN 60255-121:2014. It isidentical to IEC 60255-121:2014.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee PEL/95, Measuring relays and protection systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for
3、 its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 70318 8ICS 29.120.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy an
4、d Strategy Committee on 31 July 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60255-121:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60255-121 July 2014 ICS 29.120.70 English Version Measuring relays and protection equipment - Part 121: Functi
5、onal requirements for distance protection (IEC 60255-121:2014) Relais de mesure et dispositifs de protection - Partie 121: Exigences fonctionnelles pour protection de distance (CEI 60255-121:2014) Messrelais und Schutzeinrichtungen - Teil 121: Funktionsanforderungen fr den Distanzschutz (IEC 60255-1
6、21:2014) This European Standard was approved by CENELEC on 2014-04-11. 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 bibliog
7、raphical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 respo
8、nsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finla
9、nd, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electr
10、otechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Re
11、f. No. EN 60255-121:2014 E BS EN 60255-121:2014EN 60255-121:2014 - 2 - Foreword The text of document 95/319/FDIS, future edition 1 of IEC 60255-121, prepared by IEC/TC 95 “Measuring relays and protection equipment“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60255-12
12、1:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-01-11 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 20
13、17-04-11 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60255-121:2014
14、was approved by CENELEC as a European Standard without any modification. BS EN 60255-121:2014- 3 - EN 60255-121:2014 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively re
15、ferenced 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. NOTE 1 When an International Publication has been modified by common mo
16、difications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60050 series International electrotechnical vocabulary - - IEC 602
17、55-1 - Measuring relays and protection equipment - Part 1: Common requirements EN 60255-1 - IEC 61850 series Communication networks and systems for power utility automation EN 61850 series IEC 61869-2 2012 Instrument transformers - Part 2: Additional requirements for current transformers EN 61869-2
18、2012 IEC 61869-5 2011 Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers EN 61869-5 2011 BS EN 60255-121:2014 2 IEC 60255-121:2014 IEC 2014 CONTENTS 1 Scope 11 2 Normative references 11 3 Terms and definitions 12 4 Specification of the function . 13 4.1 Gene
19、ral 13 4.2 Input energizing quantities/energizing quantities 13 4.3 Binary input signals 14 4.4 Functional logic 15 Faulted phase identification 15 4.4.1Directional signals 15 4.4.2Distance protection function characteristics 15 4.4.3Distance protection zone timers 16 4.4.44.5 Binary output signals
20、. 16 General 16 4.5.1Start (pickup) signals 16 4.5.2Operate signals 17 4.5.3Other binary output signals . 17 4.5.44.6 Additional influencing functions/conditions . 17 General 17 4.6.1Inrush current . 17 4.6.2Switch onto fault/trip on reclose 17 4.6.3Voltage transformer (VT) signal failure (loss of v
21、oltage) 17 4.6.4Power swings . 18 4.6.5Behavior during frequencies outside of the operating range 18 4.6.65 Performance specifications 18 5.1 General 18 5.2 Effective and operating ranges . 18 5.3 Basic characteristic accuracy under steady state conditions 19 General 19 5.3.1Determination of accurac
22、y related to time delay setting 19 5.3.2Disengaging time 20 5.3.35.4 Dynamic performance 20 General 20 5.4.1Transient overreach (TO) 20 5.4.2Operate time and transient overreach (SIR diagrams) . 21 5.4.3Operate time and transient overreach (CVT-SIR diagrams). 21 5.4.4Typical operate time . 21 5.4.55
23、.5 Performance with harmonics 22 General 22 5.5.1Steady-state harmonics tests 23 5.5.2Transient LC oscillation tests 23 5.5.35.6 Performance during frequency deviation 23 General 23 5.6.1Steady state testing during frequency deviation 23 5.6.2Transient testing during frequency deviation . 23 5.6.35.
24、7 Double infeed tests 24 BS EN 60255-121:2014IEC 60255-121:2014 IEC 2014 3 General 24 5.7.1Single line, double infeed system 24 5.7.2Double line, double infeed system 24 5.7.35.8 Instrument transformer (CT, VT and CVT) requirements 25 General 25 5.8.1CT requirements . 25 5.8.26 Functional tests . 29
25、 6.1 General 29 6.2 Rated frequency characteristic accuracy tests . 29 General 29 6.2.1Basic characteristic accuracy under steady state conditions . 30 6.2.2Basic directional accuracy under steady state conditions 43 6.2.3Determination of accuracy related to time delay setting 48 6.2.4Determination
26、and reporting of the disengaging time 48 6.2.56.3 Dynamic performance 50 General 50 6.3.1Dynamic performance: operate time and transient overreach 6.3.2(SIR diagrams) . 51 Dynamic performance: operate time and transient overreach 6.3.3(CVT-SIR diagrams) . 61 Dynamic performance: transient overreach
27、tests. 65 6.3.4Dynamic performance: typical operate time 69 6.3.56.4 Performance with harmonics 74 Steady state harmonics tests 74 6.4.1Transient oscillation tests (network simulation L-C) 75 6.4.26.5 Performance during off-nominal frequency . 82 Steady state frequency deviation tests 82 6.5.1Transi
28、ent frequency deviation tests 85 6.5.26.6 Double infeed tests 90 Double infeed tests for single line . 90 6.6.1Double infeed tests for parallel lines (without mutual 6.6.2inductance) . 96 Reporting of double infeed test results 100 6.6.37 Documentation requirements . 101 7.1 Type test report . 101 7
29、.2 Documentation . 101 Annex A (informative) Impedance characteristics . 102 A.1 Overview 102 A.1.1 General 102 A.1.2 Non-directional circular characteristic . 102 A.1.3 MHO characteristic . 102 A.1.4 Quadrilateral/polygonal . 104 A.2 Example characteristics . 106 A.2.1 General 106 A.2.2 Non-directi
30、onal circular characteristic (ohm) . 106 A.2.3 Reactive reach line characteristic . 106 A.2.4 MHO characteristic . 107 A.2.5 Resistive and reactive intersecting lines characteristic 107 A.2.6 Offset MHO characteristic. 108 BS EN 60255-121:2014 4 IEC 60255-121:2014 IEC 2014 Annex B (informative) Info
31、rmative guide for the behaviour of timers in distance protection zones for evolving faults . 110 Annex C (normative) Setting example 112 Annex D (normative) Calculation of mean, median and mode. 115 D.1 Mean . 115 D.2 Median . 115 D.3 Mode . 115 D.4 Example. 115 Annex E (informative) CT saturation a
32、nd influence on the performance of distance relays 116 Annex F (informative) Informative guide for testing distance relays based on CT requirements specification 119 F.1 General 119 F.2 Test data . 120 F.3 CT data and CT model . 121 Annex G (informative) Informative guide for dimensioning of CTs for
33、 distance protection . 125 G.1 General 125 G.2 Example 1 126 G.3 Example 2 128 Annex H (normative) Calculation of relay settings based on generic point P expressed in terms of voltage and current 131 H.1 Settings for quadrilateral/polygonal characteristic 131 H.2 Settings for MHO characteristic 133
34、Annex I (normative) Ramping methods for testing the basic characteristic accuracy 134 I.1 Relationship between simulated fault impedance and analog quantities . 134 I.2 Pre-fault condition 134 I.3 Phase to earth faults 134 I.4 Phase to phase faults. . 136 I.5 Ramps in the impedance plane 139 I.5.1 P
35、seudo-continuous ramp 139 I.5.2 Ramp of shots 140 Annex J (normative) Definition of fault inception angle . 143 Annex K (normative) Capacitive voltage instrument transformer model 145 K.1 General 145 K.2 Capacitor voltage transformer (CVT) 145 Figure 1 Simplified distance protection function block d
36、iagram . 14 Figure 2 Basic accuracy specification of an operating characteristic 19 Figure 3 Basic angular accuracy specifications of directional lines . 20 Figure 4 SIR diagram Short line average operate time 22 Figure 5 Fault positions to be considered for specifying the CT requirements 26 Figure
37、6 Test procedure for basic characteristic accuracy 31 Figure 7 Calculated test points A, B and C based on the effective range of U and I . 32 Figure 8 Modified points B and C based on the limited setting range 32 Figure 9 Position of test points A, B, C, D and E in the effective range of U and I 33
38、Figure 10 Position of test points A, B, C, D and E in the effective range of U and I . 33 BS EN 60255-121:2014IEC 60255-121:2014 IEC 2014 5 Figure 11 Quadrilateral characteristic showing ten test points 34 Figure 12 Quadrilateral characteristic showing test ramps 35 Figure 13 Quadrilateral character
39、istic showing accuracy limits . 36 Figure 14 Quadrilateral/polygonal characteristic showing accuracy limits . 37 Figure 15 MHO characteristic showing nine test points 37 Figure 16 MHO characteristic showing test ramps 38 Figure 17 Accuracy limits for MHO characteristic . 39 Figure 18 Basic direction
40、al element accuracy tests 44 Figure 19 Directional element accuracy tests in the second quadrant. 45 Figure 20 Directional element accuracy tests in the second quadrant. 46 Figure 21 Directional element accuracy tests in the fourth quadrant . 46 Figure 22 Directional test accuracy lines in the fourt
41、h quadrant . 47 Figure 23 Position of the three-phase fault for testing the disengaging time . 49 Figure 24 Sequence of events for testing the disengaging time 50 Figure 25 Power system network with zero load transfer 51 Figure 26 Dynamic performance: operate time and dynamic overreach (SIR diagram)
42、 . 55 Figure 27 SIR diagram for short line: minimum operate time 56 Figure 28 SIR diagram for short line: average operate time 57 Figure 29 SIR diagram for short line: maximum operate time . 57 Figure 30 Dynamic performance tests (SIR diagrams) 59 Figure 31 SIR diagram for long line: minimum operate
43、 time . 61 Figure 32 SIR diagram for long line: average operate time . 62 Figure 33 SIR diagram for long line: maximum operate time 62 Figure 34 Dynamic performance: operate time and dynamic overreach (CVT-SIR diagram) . 64 Figure 35 CVT-SIR diagram for short line: minimum operate time 66 Figure 36
44、CVT-SIR diagram for short line: average operate time 66 Figure 37 CVT-SIR diagram for a short line: maximum operate time 67 Figure 38 Fault statistics for typical operate time . 70 Figure 39 Frequency distribution of operate time . 73 Figure 40 Ramping test for harmonics 75 Figure 41 Steady-state ha
45、rmonics test . 77 Figure 42 Simulated power system network . 78 Figure 43 Flowchart of transient oscillation tests 79 Figure 44 Simulated voltages (UL1, UL2, UL3) and currents (IL1, IL2, IL3) 81 Figure 45 Transient oscillation tests Operate time . 82 Figure 46 Test points for quadrilateral character
46、istics 83 Figure 47 Test points for MHO characteristic . 83 Figure 48 Test ramp direction for quadrilateral characteristic . 83 Figure 49 Test ramp direction for MHO characteristic . 84 Figure 50 Steady-state frequency deviation tests . 86 Figure 51 Short line model for frequency deviation test 87 F
47、igure 52 Flowchart of transient frequency deviation tests . 89 BS EN 60255-121:2014 6 IEC 60255-121:2014 IEC 2014 Figure 53 SIR diagrams for frequency deviation tests average operate time 90 Figure 54 Network model for single line tests . 91 Figure 55 Line to earth fault . 92 Figure 56 Line to line
48、fault . 92 Figure 57 Line to line to earth fault 92 Figure 58 Three-phase fault . 93 Figure 59 Network model for parallel lines tests . 98 Figure 60 Network model for current reversal test 99 Figure A.1 Non-directional circular characteristic with directional supervision 102 Figure A.2 MHO character
49、istic . 103 Figure A.3 Quadrilateral/polygonal characteristics . 104 Figure A.4 Non-directional circular characteristic (ohm) . 106 Figure A.5 Reactive reach line characteristic . 107 Figure A.6 MHO characteristics . 107 Figure A.7 Resistive and reactive intersecting lines characteristics 108 Figure A.8 Offset MHO . 108 Figure B.1 The same fault type evolving from time delayed zone 3 (posi
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