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BS EN 61869-6:2016:2017 Edition

BS EN 61869-6:2016:2017 Edition

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Instrument transformers – Additional general requirements for low-power instrument transformers

Published By Publication Date Number of Pages
BSI 2017 94
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IEC 61869-6:2016(E) is a product family standard and covers only additional general requirements for low-power instrument transformers (LPIT) used for a.c. applications having rated frequencies from 15 Hz to 100 Hz covering MV, HV and EHV or used for d.c. applications. This product standard is based on IEC 61869-1:2007, in addition to the relevant product specific standard. This part of IEC 61869 does not cover the specification for the digital output format of instrument transformers. This part of IEC 61869 defines the errors in case of analogue or digital output. The other characteristics of the digital interface for instrument transformers are standardised in IEC 61869-9 as an application of the standards, the IEC 61850 series, which details layered substation communication architecture. This part of IEC 61869 considers additional requirements concerning bandwidth. General Requirements; however, the reader is encouraged to use its most recent edition. This first edition of IEC 61869-6 cancels and replaces the relevant parts of IEC 60044-7, published in 1999, and of IEC 60044-8, published in 2002. This publication is to be read in conjunction with /2

PDF Catalog

PDF Pages PDF Title
9 CONTENTS
13 FOREWORD
17 1 Scope
2 Normative reference
Figures
FigureĀ 601 ā€“ General block diagram of a single-phase LPIT
20 3 Terms and definitions
3.1 General terms and definitions
24 3.2 Terms and definitions related to dielectric ratings and voltages
3.3 Terms and definitions related to current ratings
26 FigureĀ 602 ā€“ Primary time constant Tp
27 FigureĀ 603 ā€“ Duty cycles, single energization
28 3.4 Terms and definitions related to accuracy
FigureĀ 604 ā€“ Duty cycles, double energization
33 3.5 Terms and definitions related to other ratings
3.7 Index of abbreviations and symbols
35 4 Normal and special service conditions
4.2 Normal service conditions
4.2.3 Vibrations or earth tremors
4.2.601 Partially outdoor LPIT
5 Ratings
5.3 Rated insulation levels and voltages
5.3.5 Insulation requirements for secondary terminals
5.3.601 Rated auxiliary power supply voltage (Uar)
Tables
Table 601 ā€“ Secondary terminal and low voltage component withstand capability
36 5.4 Rated frequency
5.5 Rated output
5.5.601 Rated burden (Rbr)
5.5.602 Standard values for the rated delay time (tdr)
37 5.6 Rated accuracy class
6 Design and construction
6.7 Mechanical requirements
6.11 Electromagnetic compatibility (EMC)
6.11.3 Requirements for immunity
TableĀ 602 ā€“ Immunity requirements and tests
39 6.11.4 Requirement for transmitted overvoltages
6.11.601 Emission requirements
40 6.13 Markings
6.601 Requirements for optical transmitting system and optical output link
6.601.1 General
6.601.2 Optical connectors
6.601.3 Fibre optic terminal box
6.601.4 Total cable length
6.602 Requirements for electrical transmitting system and electrical wires for output link
6.602.1 Connectors
41 6.602.2 Earthing of the output cable
6.603 Signal-to-noise ratio
Table 603 ā€“ Connectors
42 6.604 Failure detection and maintenance announcement
6.605 Operability
6.606 Reliability and dependability
6.607 Vibrations
43 7 Tests
7.1 General
7.1.2 List of tests
Table 10 ā€“ List of tests
44 7.2 Type tests
7.2.1 General
7.2.2 Temperature-rise test
7.2.3 Impulse voltage withstand test on primary terminals
7.2.5 Electromagnetic compatibility (EMC) tests
45 Figure 605 ā€“ Examples of subassembly subjected to EMC tests ā€“Usual structure used in HV AIS applications
46 Figure 606 ā€“ Examples of subassembly subjected to EMC tests ā€“Usual structure used in MV applications
Figure 607 ā€“ Examples of subassembly subjected to EMC tests ā€“Usual structure used in HV GIS applications
48 7.2.6 Test for accuracy
49 Figure 608 ā€“ Temperature cycle accuracy test
50 7.2.601 Low-voltage component voltage withstand test
51 7.3 Routine tests
7.3.1 Power-frequency voltage withstand tests on primary terminals
52 7.3.4 Power-frequency voltage withstand tests on secondary terminals
7.3.5 Test for accuracy
7.3.601 Power-frequency voltage withstand test for low-voltage components
7.4 Special tests
7.4.601 Vibration tests
53 601 Information to be given with enquiries, tenders and orders
601.1 Designation
601.2 Dependability
54 AnnexĀ 6A (normative)LPIT frequency response and accuracy requirements for harmonics
6A.1 General
6A.2 Requirements for noise and distortion
6A.3 Anti-aliasing filter requirements for LPIT using digital data processing
55 Figure 6A.1 ā€“ Digital data acquisition system example
TableĀ 6A.1 ā€“ Anti-aliasing filter
56 6A.4 LPIT accuracy requirements for harmonics and low frequencies
6A.4.1 General
6A.4.2 Measuring accuracy classes
Figure 6A.2 ā€“ Frequency response mask for metering accuracy classĀ 1(fr = 60Ā Hz, fs = 4Ā 800Ā Hz)
57 6A.4.3 Accuracy class extension for quality metering and low bandwidth d.c. applications
Table 6A.2 ā€“ Measuring accuracy classes
Table 6A.3 ā€“ Accuracy classes extension for quality meteringand low bandwidth d.c. applications
58 6A.4.4 Protective accuracy classes
6A.4.5 Special high bandwidth protection accuracy class
Table 6A.4 ā€“ Accuracy classes extension for high bandwidth d.c. applications
Table 6A.5 ā€“ Protective accuracy classes
59 6A.4.6 Special accuracy classes for d.c. coupled low-power voltage transformers
6A.5 Tests for accuracy versus harmonics and low frequencies
Table 6A.6 ā€“ Accuracy classes for special high bandwidth protection
Table 6A.7 ā€“ Accuracy classes for special d.c. coupled low-power voltage transformers
60 6A.6 Test arrangement and test circuit
6A.6.1 Test for accuracy for harmonics and low frequencies
6A.6.2 Type test for proper anti-aliasing
Table 6A.8 ā€“ Accuracy classes for harmonics
62 AnnexĀ 6B (informative)Transient performances of low-power current transformers
6B.1 General
6B.2 Short-circuit currents in power systems
63 Figure 6B.1 ā€“ Illustration of a fault in a power system
Figure 6B.2 ā€“ Short-circuit current a.c. and d.c. components
64 Figure 6B.3 ā€“ Symmetric fault current
Figure 6B.4 ā€“ Asymmetric fault current
65 6B.3 Conventional current transformer equivalent circuit
Figure 6B.5 ā€“ Equivalent electrical circuit of a conventional CT
66 Figure 6B.6 ā€“ Flux-current characteristic for a conventional CTwithout remanence representation
67 6B.4 Types of current transformers
6B.4.1 Types of conventional CTs
Figure 6B.7 ā€“ Representation of hysteresis and remanent flux for a conventional CT
68 6B.4.2 Types of low-power current transformers
Table 6B.1 ā€“ Protective CTs
69 6B.5 Transient performance of current transformers
6B.5.1 Transient performance of conventional current transformers
Figure 6B.8 ā€“ Comparison of flux-current characteristics for gapped and gapless CTs
70 6B.5.2 Transient performance of low-power current transformers
Figure 6B.9 ā€“ Secondary current distorted due to the CT saturation
Figure 6B.10 ā€“ AC component for non-saturated and saturated CT
71 6B.6 Summary
72 AnnexĀ 6C (informative)Transient performances of low-power voltage transformers
6C.1 Overview
6C.2 General
6C.2.1 Defining primary and secondary voltages
6C.2.2 Normal service conditions of the network
73 6C.2.3 Abnormal service conditions of the network
6C.2.4 Rated secondary voltages
6C.2.5 Steady-state conditions
6C.3 Transient conditions
6C.3.1 Theoretical considerations
76 Figure 6C.1 ā€“ Schematic diagram explaining the trapped charge phenomena
77 Figure 6C.2 ā€“ Voltages during trapped charges phenomena
78 Table 6C.1 ā€“ Primary short circuit
Table 6C.2 ā€“ Trapped charges
Table 6C.3 ā€“ Limits of instantaneous voltage error for protective electronic voltage transformers in case of trapped charges reclose
79 Figure 6C.3 ā€“ Modelization example of a simplified low-power voltage transformer
80 6C.3.2 Definition of transient error
6C.3.3 Test of transient performance
83 Figure 6C.4 ā€“ Testing arrangement for short time constant
84 Figure 6C.5 ā€“ Testing arrangement for long time constant
Figure 6C.6 ā€“ Typical waveform of e(t) during test
85 AnnexĀ 6D (informative)Test circuits
6D.1 Test circuits for accuracy measurements in steady state for low-power current transformers
Figure 6D.1 ā€“ Test circuit for analogue accuracy measurements in steady state
86 Figure 6D.2 ā€“ Test circuit for analogue accuracy measurementsin steady state (alternative solution)
87 Figure 6D.3 ā€“ Test circuit for digital accuracy measurements in steady state
88 6D.2 Test circuits for accuracy measurements in steady state for low-power voltage transformers
Figure 6D.4 ā€“ Test circuit for analogue accuracy measurements in steady state
89 Figure 6D.5 ā€“ Test circuit for analogue accuracy measurementsin steady state (alternative solution)
90 Figure 6D.6 ā€“ Test circuit for digital accuracy measurements in steady state
91 AnnexĀ 6E (informative)Graph explaining the accuracy requirements formulti-purpose low-power current transformer
Figure 6E.1 ā€“ Accuracy limits of a multi-purpose low-power current transformer
92 Bibliography

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