BSI 20/30425644 DC 2020
$24.66
BS EN 61869-1. Instrument transformers – Part 1. General requirements
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 142 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 12 | FOREWORD |
| 14 | INTRODUCTION |
| 18 | 1 Scope 2 Normative references |
| 22 | 3 Terms and definitions 3.1 General definitions |
| 26 | 3.2 Definitions related to voltage and insulation aspects |
| 28 | 3.3 Definitions related to current ratings |
| 29 | 3.4 Definitions related to accuracy |
| 32 | 3.5 Definitions related to other ratings 3.6 Definitions related to gas insulation |
| 33 | 3.7 Definitions related to seismic qualification |
| 36 | 3.8 Index of abbreviations |
| 37 | 4 Normal and special environmental conditions 4.1 General 4.2 Normal environmental conditions 4.2.1 Ambient air temperature 4.2.2 Altitude 4.2.3 Vibrations or earth tremors 4.2.4 Other environmental conditions for indoor instrument transformers |
| 38 | 4.2.5 Other environmental conditions for outdoor instrument transformers 4.2.6 IT with outdoor parts 4.3 Special environmental conditions 4.3.1 General 4.3.2 Altitude 4.3.2.1 Influence of altitude on external insulation 4.3.2.2 Influence of altitude on temperature rise 4.3.3 Ambient temperature 4.3.4 Exposure to pollution |
| 39 | 4.3.5 Vibrations or earth tremors 4.3.6 Earthquakes 5 Ratings 5.1 General 5.2 Voltage ratings 5.2.1 Highest voltage for equipment (Um) |
| 40 | 5.2.2 Highest voltage of the system (Usys) |
| 41 | 5.2.3 System earthing 5.2.4 Rated auxiliary power supply voltage 5.2.4.1 General 5.2.4.2 Rated AC auxiliary voltage 5.2.4.3 Rated DC auxiliary voltage 5.2.4.4 Insulation requirements for power supply terminals |
| 42 | 5.3 Current ratings 5.3.1 Standard values for rated primary current 5.3.2 Standard values for rated secondary current 5.3.3 Standard values for rated continuous thermal current 5.3.4 Short-time current ratings 5.3.4.1 Rated short-time thermal current (Ith) 5.3.4.2 Rated dynamic current (Idyn) 5.3.4.3 Rated internal arc fault current (Iarc) 5.4 Dielectric ratings 5.4.1 General 5.4.2 Rated primary terminal insulation level |
| 43 | 5.4.3 Other requirements for primary terminals insulation 5.4.3.1 Partial discharges 5.4.3.2 Chopped lightning impulse 5.4.3.3 Capacitance and dielectric dissipation factor (tan) |
| 44 | 5.4.4 Between-section insulation requirements 5.4.5 Insulation requirements for secondary terminals and low-voltage components 5.4.5.1 General requirements 5.4.5.2 Special requirements for LPIT 5.4.5.3 DC insulation resistance test 5.5 Rated frequency (fr) |
| 45 | 5.6 Output ratings 5.6.1 Rated burden (Zbr) 5.6.1.1 Rated burden for classic IT 5.6.1.2 Rated burden for LPIT 5.6.2 Standard values for the rated delay time for electronic LPIT (tdr) 5.7 Rated accuracy class 5.8 Extended accuracy class for harmonics for LPIT 6 Design and construction 6.1 Requirements for liquids used in equipment 6.1.1 General 6.1.2 Liquid quality |
| 46 | 6.1.3 Liquid level indicator 6.1.4 Liquid tightness 6.2 Requirements for gases used in equipment 6.2.1 General 6.2.2 Gas quality 6.2.3 Gas monitoring device 6.2.4 Gas tightness 6.2.4.1 General 6.2.4.2 Closed pressure systems for gas |
| 47 | 6.2.5 Pressure relief device 6.3 Requirements for solid materials used in equipment 6.4 Requirements for temperature rise of parts and components 6.4.1 General |
| 48 | 6.4.2 Influence of altitude on temperature rise |
| 49 | 6.5 Requirements for earthing of equipment 6.5.1 General 6.5.2 Earthing of the enclosure 6.5.2.1 GIS enclosure 6.5.2.2 Enclosure of low-voltage components 6.5.3 Electrical continuity |
| 50 | 6.6 Requirements for the external insulation 6.6.1 Pollution 6.6.2 Altitude 6.7 Mechanical requirements |
| 51 | 6.8 Multiple chopped impulses on primary terminals 6.9 Internal arc fault protection requirements |
| 52 | 6.10 Degrees of protection by enclosures 6.10.1 General 6.10.2 Protection against access to hazardous parts and protection of the equipment against ingress of solid foreign objects and water |
| 53 | 6.10.3 Protection of enclosure against mechanical impact under normal service conditions 6.11 Electromagnetic Compatibility (EMC) 6.11.1 General 6.11.2 Requirements for immunity for electronic LPIT |
| 55 | 6.11.3 Requirements for emission for electronic LPIT 6.11.4 Requirements for transmitted overvoltage (TOV) 6.11.5 Requirements for Radio Interference Voltage (RIV) |
| 56 | 6.12 Corrosion 6.13 Markings 6.13.1 General 6.13.2 Terminal markings 6.13.2.1 General rules 6.13.2.2 Method of marking 6.13.2.3 Markings to be used 6.13.2.4 Indication of relative polarities 6.13.3 Rating plate markings |
| 57 | 6.14 Requirements for LPIT secondary terminal connection 6.14.1 Requirements for optical transmitting system 6.14.1.1 General 6.14.1.2 Optical connectors for digital transmitting interface |
| 58 | 6.14.1.3 Fibre optic terminal box 6.14.1.4 Total fibre optic cable length 6.14.2 Requirements for electrical wires for LPIT secondary connection 6.14.2.1 Connectors 6.14.2.2 Earthing of the secondary cable |
| 59 | 6.15 Electronic LPIT noise specification 6.16 Fire hazard 6.17 Pressure withstand of gas-filled enclosures 6.18 Failure detection and maintenance announcement of EIT 6.19 Operability |
| 60 | 6.20 Reliability and dependability of EIT 6.21 Vibration requirements for EIT 6.22 Storage climatic conditions withstand capability 7 Tests 7.1 General 7.1.1 Classification of tests |
| 61 | 7.1.2 List of tests |
| 63 | 7.1.3 Sequence of tests 7.2 Type tests 7.2.1 General 7.2.1.1 Common requirements |
| 64 | 7.2.1.2 Information for identification of specimen 7.2.1.3 Information to be included in type test reports |
| 65 | 7.2.2 Temperature rise test 7.2.2.1 General 7.2.2.2 Measurement of the ambient temperature 7.2.2.3 Duration of test 7.2.3 Impulse voltage withstand test on primary terminals 7.2.3.1 General |
| 66 | 7.2.3.2 Lightning impulse voltage test on primary terminals 7.2.3.2.1 General case |
| 67 | 7.2.3.2.2 Oil-insulated instrument transformers having Um ≥ 300 kV 7.2.3.3 Chopped impulse voltage withstand test on primary terminals |
| 68 | 7.2.3.4 Switching impulse voltage test 7.2.4 Wet test for outdoor type transformers 7.2.5 Electromagnetic Compatibility (EMC) tests 7.2.5.1 RIV test |
| 70 | 7.2.5.2 Immunity test 7.2.5.2.1 General |
| 72 | 7.2.5.2.2 General conditions during immunity tests 7.2.5.2.3 Harmonic and interharmonic disturbance test 7.2.5.2.4 Slow voltage variation test |
| 73 | 7.2.5.2.5 Voltage dips and short interruption test 7.2.5.2.6 Surge immunity test 7.2.5.2.7 Conducted immunity test (150 kHz to 80 MHz) 7.2.5.2.8 Conducted immunity tests (0 to 150 kHz) 7.2.5.2.9 Electronic fast transient/burst test |
| 74 | 7.2.5.2.10 Damped oscillatory waves immunity test 7.2.5.2.11 Electrostatic discharge test 7.2.5.2.12 Power frequency magnetic field immunity test 7.2.5.2.13 Pulse magnetic field immunity test 7.2.5.2.14 Damped oscillatory magnetic field immunity test 7.2.5.2.15 Radiated, radiofrequency, electromagnetic field immunity test |
| 75 | 7.2.5.2.16 Voltage ripple on DC power supply 7.2.5.2.17 Gradual shutdown and start-up test 7.2.5.3 EMC emission tests 7.2.5.4 Transmitted overvoltage test |
| 79 | 7.2.6 Tests for accuracy 7.2.6.1 General 7.2.6.2 Basic accuracy tests |
| 80 | 7.2.6.3 Temperature cycle accuracy test |
| 81 | 7.2.6.4 Additional accuracy tests for protective instrument transformer 7.2.7 Verification of the degree of protection by enclosures 7.2.7.1 Verification of the IP coding 7.2.7.2 Mechanical impact test 7.2.8 Enclosure tightness test at ambient temperature 7.2.9 Proof test for the enclosure |
| 82 | 7.2.10 Mechanical tests |
| 83 | 7.2.11 Voltage withstand test of low-voltage components and secondary terminals 7.2.11.1 General |
| 84 | 7.2.11.2 Impulse voltage withstand test 7.2.12 Storage climatic environmental tests 7.2.12.1 General 7.2.12.2 Dry heat test, storage temperature |
| 85 | 7.2.12.3 Cold test, storage temperature 7.2.12.4 Damp heat steady state test |
| 86 | 7.2.13 Vibration test 7.3 Routine tests 7.3.1 Power frequency voltage withstand tests on primary terminals |
| 87 | 7.3.2 Partial discharge measurement 7.3.2.1 Test circuit and instrumentation |
| 88 | 7.3.2.2 Partial discharge test procedure |
| 89 | 7.3.3 Power frequency voltage withstand tests between sections 7.3.4 Power frequency voltage withstand tests on secondary terminals 7.3.5 Insulation resistance measurement on secondary terminals |
| 90 | 7.3.6 Power frequency voltage withstand test for low-voltage components 7.3.7 Test for accuracy 7.3.8 Verification of markings 7.3.9 Enclosure tightness test at ambient temperature 7.3.9.1 Closed pressure systems for gas 7.3.9.2 Liquid systems |
| 91 | 7.3.10 Pressure test for the enclosure 7.3.11 Measurement of capacitance and dielectric dissipation factor 7.4 Special tests 7.4.1 Multiple chopped impulse test on primary terminals |
| 92 | 7.4.2 Internal arc fault test |
| 93 | 7.4.3 Enclosure tightness test at low and high temperatures 7.4.4 Corrosion test 7.4.4.1 Test procedure |
| 94 | 7.4.4.2 Criteria to pass the test 7.4.5 Fire hazard test 7.4.6 Thermo-mechanical endurance test |
| 95 | 7.4.7 Vibration tests for EIT 7.4.7.1 General 7.4.7.2 Vibration test for primary parts during short-time current 7.4.7.3 Vibration tests for primary parts mechanically coupled to a switchgear 7.4.7.3.1 General 7.4.7.3.2 Vibration during operation 7.4.7.3.3 Vibration endurance test 7.4.8 Accuracy tests on harmonics 7.5 Commissioning tests 7.5.1 General |
| 96 | 7.5.2 Final installation inspection and tests 7.5.2.1 General 7.5.2.2 Tests on gas-insulated instrument transformers 7.5.2.3 Insulation test on LV connection 7.5.3 Gas dew point test 7.6 Sample tests 8 Rules for transport, storage, erection, operation and maintenance 8.1 General |
| 97 | 8.2 Conditions during transport, storage and installation 8.3 Installation 8.3.1 General 8.3.2 Unpacking and lifting 8.3.3 Assembly 8.3.4 Mounting 8.3.5 Connections 8.3.6 Final installation inspection and tests |
| 98 | 8.4 Operation 8.5 Maintenance 8.5.1 General 8.5.2 Responsibilities for the manufacturer |
| 99 | 8.5.3 Responsibilities for the user 8.6 Failure report 9 Safety 10 Influence of products on the natural environment |
| 100 | Annex A (normative) Identification of test specimen A.1 General A.2 Data A.3 Drawings |
| 101 | Annex B (normative) LPIT frequency response and accuracy requirements for harmonics B.1 General B.2 Requirements for noise and distortion B.3 Anti-aliasing filter requirements for LPIT using digital data processing |
| 102 | B.4 LPIT accuracy requirements for harmonics and low frequencies B.4.1 General |
| 103 | B.4.2 Measuring accuracy classes |
| 104 | B.4.3 Accuracy class extension for high bandwidth applications B.4.4 Protective accuracy classes B.4.5 Special high bandwidth protection accuracy class |
| 105 | B.4.6 Special accuracy classes for DC coupled low-power voltage transformers B.5 Tests for accuracy versus harmonics and low frequencies |
| 106 | B.6 Test arrangement and test circuit B.6.1 Test for accuracy for harmonics and low frequencies B.6.2 Type test for proper anti-aliasing |
| 107 | Annex C (informative) Recommendation for contents of failure reports C.1 General C.2 Content |
| 109 | Annex D (informative) Fire hazard D.1 Fire hazard D.2 Fire hazard test |
| 110 | Annex E (informative) Sample test E.1 Sample test definition E.2 Sample tests |
| 111 | Annex F (informative) Information regarding recommended corrosion test requirements F.1 Introduction F.2 Recommendation for minimum requirements F.3 Recommended test requirements |
| 112 | Annex G (informative) Technique used in temperature rise test of transformers to determine the thermal time constant by an experimental estimation |
| 114 | Annex H (informative) Guidance for the extension of validity of type tests or special tests of instrument transformers H.1 General H.2 Information needed for extension of type test validity |
| 115 | H.3 Application of extension criteria H.3.1 Dielectric tests H.3.2 Temperature rise tests |
| 116 | H.3.3 Short-time and peak withstand current tests (current transformers) H.3.4 Internal arc fault tests |
| 117 | H.3.5 Multiple chopped impulse test |
| 118 | Annex I (informative) Guidance for the calculation of equivalent diameter in case of irregular shape of insulating part I.1 General I.2 Current transformers and earthed voltage transformers |
| 119 | I.3 Unearthed voltage transformers |
| 121 | Annex J (informative) Test circuits J.1 Test circuits for accuracy measurements in steady state for current transformers with analogue secondary signal |
| 125 | J.2 Test circuits for accuracy measurements in steady state for voltage transformers with analogue secondary signal |
| 129 | Annex K (informative) Graph explaining the accuracy requirements for multi-purpose low-power current transformer |
| 130 | Annex L (normative) Seismic qualification of instrument transformers L.1 Scope L.2 Seismic conditions L.2.1 Time history |
| 131 | L.2.2 Seismic severity of application L.2.3 Superelevation factor (k) |
| 132 | L.3 Seismic specifications |
| 133 | L.4 The qualification procedure |
| 134 | L.4.1 Qualification by static calculation / dynamic analysis L.4.1.1 Combination of stresses L.4.1.2 Qualification by static calculation L.4.1.2.1 Applicability L.4.1.2.2 Determining the test object specifications |
| 135 | L.4.1.2.3 Calculation method |
| 137 | L.4.1.3 Qualification by dynamic analysis L.4.1.3.1 Applicability |
| 138 | L.4.1.3.2 Determining the test object specifications L.4.1.3.3 Method L.4.1.3.3.1 Using time history L.4.1.3.3.2 Using RRS |
| 139 | L.4.1.3.4 Acceptance criteria L.4.1.4 Documentation L.4.2 Qualification by test L.4.2.1 General L.4.2.2 Applicability L.4.2.3 External load |
| 140 | L.4.2.4 Test axes L.4.2.5 Excitation waveform L.4.2.6 Required parameters L.4.2.7 Measurements L.4.2.8 Acceptance criteria |
| 141 | L.4.2.9 Documentation |
| 142 | Bibliography |
