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IEC 60255-121:2014

Current
Current

The latest, up-to-date edition.

Measuring relays and protection equipment - Part 121: Functional requirements for distance protection
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English - French

Published date

03-07-2014

Publisher

International Electrotechnical Committee

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Specification of the function
5 Performance specifications
6 Functional tests
7 Documentation requirements
Annex A (informative) - Impedance characteristics
Annex B (informative) - Informative guide for the behaviour
        of timers in distance protection zones for
        evolving faults
Annex C (normative) - Setting example
Annex D (normative) - Calculation of mean, median
        and mode
Annex E (informative) - CT saturation and influence on
        the performance of distance relays
Annex F (informative) - Informative guide for testing
        distance relays based on CT requirements
        specification
Annex G (informative) - Informative guide for dimensioning
        of CTs for distance protection
Annex H (normative) - Calculation of relay settings based
        on generic point P expressed in terms of voltage
        and current
Annex I (normative) - Ramping methods for testing the basic
        characteristic accuracy
Annex J (normative) - Definition of fault inception angle
Annex K (normative) - Capacitive voltage instrument
        transformer model

IEC 60255-121:2014 specifies minimum requirements for functional and performance evaluation of distance protection function typically used in, but not limited to, line applications for effectively earthed, three-phase power systems. This standard also defines how to document and publish performance tests. This standard covers distance protection function whose operating characteristic can be defined on an impedance plane and includes specification of the protection function, measurement characteristics, phase selection, directionality, starting and time delay characteristics. The test methodologies for verifying performance characteristics and accuracy are included in this standard. The standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. It also includes the instrument transformer requirements for the protection function. The general requirements for measuring relays and protection equipment are defined in IEC 60255-1.

Committee
TC 95
DevelopmentNote
Supersedes IEC 60255-16. (03/2014) Stability date: 2018. (09/2017)
DocumentType
Standard
Pages
302
PublisherName
International Electrotechnical Committee
Status
Current
Supersedes

PD IEC/TR 61869-100:2017 Instrument transformers Guidance for application of current transformers in power system protection
IEC TR 61869-100:2017 Instrument transformers - Part 100: Guidance for application of current transformers in power system protection
CEI EN IEC 61936-1:2024 Power installations exceeding 1 kV AC and 1,5 kV DC Part 1: AC

IEC 61869-2:2012 Instrument transformers - Part 2: Additional requirements for current transformers
IEC 60255-1:1967 Electrical relays - Part 1: Instantaneous all-or-nothing relays
IEC 61869-5:2011 Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers

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Hardcopy - English - French
PDF - English - French
PDF 3 Users - English - French
PDF 5 Users - English - French
PDF 9 Users - English - French
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