🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BSI 24/30496142 DC:2024 Edition

BSI 24/30496142 DC:2024 Edition

$13.70

BS EN IEC 61869-7 Instrument transformers – Part 7. Specific requirements for electronic Voltage Transformers

Published By Publication Date Number of Pages
BSI 2024 69
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

PDF Catalog

PDF Pages PDF Title
12 FOREWORD
15 INTRODUCTION
17 1 Scope
2 Normative reference
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
18 3.2 Index of abbreviations
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 Exposure to pollution
4.2.5 Other environmental conditions for indoor instrument transformers
4.2.6 Other environmental conditions for outdoor instrument transformers
4.2.7 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
19 4.3.3 Ambient temperature
4.3.4 Vibrations or earth tremors
4.3.5 Earthquakes
5 Ratings
5.1 General
5.2 Voltage ratings
5.2.1 Highest voltage for equipment (Um)
5.2.2 Power system earthing
5.2.3 Standard values for rated primary voltage (Upr)
20 5.2.4 Standard values for rated secondary voltage (Usr)
5.2.5 Rated auxiliary power supply voltage (Uar)
5.2.5.1 General
5.2.5.2 Rated AC auxiliary voltage
5.2.5.3 Rated DC auxiliary voltage
21 5.2.5.4 Insulation requirements for power supply terminals
5.3 Current Ratings
5.3.1 Standard values for rated primary current (Ipr)
5.3.2 Standard values of rated secondary current (Isr)
5.3.3 Standard value of rated continuous thermal current (Icth)
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
5.4.3 Other requirements for primary terminal insulation
5.4.3.1 Partial discharges
5.4.3.2 Chopped lightning impulse
5.4.3.3 Capacitance and dielectric dissipation factor (tanδ)
5.4.4 Between-section insulation requirements
22 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 LPITs
23 5.4.5.3 DC insulation resistance requirement
5.5 Rated frequency (fr)
5.6 Output ratings
5.6.1 Rated output for inductive instrument transformers and CVTs
5.6.2 Rated burden for LPITs
5.6.3 Standard values for the rated delay time for EITs (tdr)
24 5.7 Accuracy requirements
5.7.1 General
1.1.1 Accuracy based on corrected transformation
5.7.2 Rated accuracy class
5.7.3 Accuracy class extension for harmonics
5.7.4 Accuracy requirements for harmonics
5.7.5 Harmonic requirements for LPIT protection accuracy classes
5.7.6 Anti-aliasing filter for EIT using digital data processing
5.7.701 Measuring LPVT
5.7.701.1 Accuracy class designation
5.7.701.2 Standard accuracy classes
25 5.7.701.3 Limits of ratio error (ε) and phase error (() for measuring LPVT at rated frequency
5.7.702 Protective LPVT
5.7.702.1 Accuracy class designation
5.7.702.2 Standard accuracy classes
5.7.702.3 Limits of ratio error, phase error for protective and multipurpose LPVT
26 5.7.704 Limits for the secondary voltage offset and noise
27 6 Design and construction
6.1 Requirements for liquids used in equipment
6.1.1 General
6.1.2 Liquid quality
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
28 6.2.4 Gas tightness
6.2.4.1 General
6.2.4.2 Closed pressure systems for gas
6.2.4.3 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
6.4.2 Influence of altitude on temperature rise
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
6.6 Requirements for the external insulation
6.6.1 Pollution
6.6.2 Altitude
29 6.7 Mechanical requirements
6.8 Multiple chopped impulses on primary terminals
6.9 Internal arc fault protection requirements
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
6.10.3 Protection of enclosure against mechanical impact under normal operating conditions
6.11 Electromagnetic compatibility (EMC)
6.11.1 General
6.11.2 Requirements for immunity
6.11.3 Requirements for emission
6.11.4 Requirements for transmitted overvoltage (TOV)
6.11.5 Requirements for radio interference voltage (RIV)
6.11.701 Impact of electric field at rated frequency from other phases
30 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
31 6.14 Requirements for LPIT secondary terminal connection
6.14.1 Requirements for digital output connection
6.14.1.1 General
6.14.1.2 Optical connectors for digital transmitting interface
6.14.1.3 Fibre optic terminal box
32 6.14.1.4 Total fibre optic cable length
6.14.2 Requirements for analogue output connections
6.14.2.1 Connectors
6.14.2.2 Shielding of the secondary circuit
6.15 EIT secondary signal noise
6.16 Fire hazard
6.17 Pressure withstand of gas-filled enclosures
6.18 Failure detection of EIT
6.19 Operability
6.20 Reliability and dependability of electronic part of EIT
6.21 Vibration Requirements
6.22 Storage climatic conditions withstand capability
6.701 Transient response requirements
6.701.1 General
6.701.2 Primary short-circuit
33 6.701.3 Step response
6.702 Voltage limitation devices requirements
6.703 Recommended time interval for the verification of accuracy
7 Tests
7.1 General
7.1.1 Classification of tests
7.1.2 List of tests
35 7.1.3 Sequence of tests
7.1.4 Testing conditions
7.2 Type tests
7.2.1 General
7.2.1.1 Common requirements
7.2.1.2 Information for identification of specimen
7.2.1.3 Information to be included in type test reports
7.2.2 Temperature-rise test
7.2.2.1 General
36 Test procedure
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
7.2.3.2 Lightning impulse voltage test on primary terminals
7.2.3.2.1 General
7.2.3.2.2 Liquid-insulated instrument transformers with Um ≥ 300 kV
37 7.2.3.2.3 Subclause 7.2.3.2.3 of IEC 61869-1:2023 applies.
7.2.3.3 Chopped impulse voltage withstand test on primary terminals
7.2.3.4 Switching impulse voltage test
7.2.4 Wet test for outdoor type instrument transformers
7.2.5 Electromagnetic compatibility (EMC) tests
7.2.5.1 RIV test
7.2.5.2 Immunity test
7.2.5.2.1 General
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
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 Electrical fast transient/burst immunity test
38 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
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
7.2.6 Test for accuracy
7.2.6.1 General
7.2.6.2 Basic accuracy tests
39 7.2.6.3 Additional accuracy tests for protective instrument transformers
7.2.6.4 Temperature cycle accuracy test
7.2.6.701 Test for accuracy versus frequency
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
40 7.2.8 Enclosure tightness test at ambient temperature
7.2.9 Proof test for the gas-filled enclosure
7.2.10 Mechanical tests
7.2.11 Voltage withstand test of low-voltage components and secondary terminals
7.2.12 Storage climatic environmental tests
7.2.12.1 General
7.2.12.2 Dry heat test, storage temperature
7.2.12.3 Cold test, storage temperature
7.2.12.4 Damp heat steady state test
7.2.13 Vibration test
7.2.14 Durability of markings
7.2.15 Tests for accuracy for harmonics
7.2.16 Test for anti-aliasing for EIT
41 7.2.701 Test for impact of electric field at rated frequency from other phases
7.2.701.1 General
7.2.701.2 Test setup for AIS LPVTs
42 7.2.701.3 Test procedure for AIS LPVTs
7.2.701.4 Test procedure for three-phase LPVTs for GIS or metal enclosed system
43 7.2.702 Tests for digital output
7.2.703 Test for offset
7.2.704 Test for noise
44 7.3 Routine tests
7.3.1 Power-frequency voltage withstand tests on primary terminals
7.3.2.1 Test circuit and instrumentation
7.3.2.2 Partial discharge test procedure
7.3.4 Power-frequency voltage withstand test on secondary terminals
7.3.5 Power-frequency voltage withstand test for low-voltage components
7.3.6 Test for accuracy
45 7.3.7 Verification of markings
7.3.8 Enclosure tightness test at ambient temperature
7.3.8.1 Closed pressure systems for gas
7.3.8.2 Liquid systems
7.3.9 Pressure test for the gas-filled enclosure
7.3.10 Measurement of capacitance and dielectric dissipation factor
7.3.701 Resistance measurement
7.4 Special tests
7.4.1 Multiple chopped impulse test on primary terminals
7.4.2 Transmitted overvoltage test
46 7.4.3 Internal arc fault test
7.4.4 Enclosure tightness test at low and high temperatures
7.4.5 Insulation resistance measurement on secondary terminals
7.4.6 Corrosion test
7.4.7 Fire hazard test
7.4.8 Thermo-mechanical endurance test
7.4.9 Vibration and shock tests
7.4.9.1 General
7.4.9.2 Vibration test for primary parts during short-time current
7.4.9.3 Vibration tests for primary parts mechanically coupled to a switchgear
7.4.9.3.1 General
7.4.9.3.2 Vibration during operation
7.4.9.3.3 Shock test for parts mechanically coupled to a circuit-breaker
7.4.10 Tests for accuracy versus harmonics
7.4.11 Seismic qualification
47 7.4.701 Transient response test
7.4.701.1 General
7.4.701.2 Primary short-circuit test
7.4.701.3 Measurement of step response time
48 7.5 Commissioning tests
7.5.1 General
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 withstand test on LV connection
7.5.3 Gas dew point test
7.6 Sample tests
49 8 Rules for transport, storage, erection, operation and maintenance
8.1 General
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
8.4 Operation
8.5 Maintenance
8.5.1 General
8.5.2 Responsibilities for the manufacturer
8.5.3 Responsibilities for the user
8.6 Failure report
50 9 Safety
10 Influence of products on the natural environment
701 Information to be given with enquiries, tenders and orders
51 Annex 7A (informative) Performance of LPVT during transient phenomena in power networks
7A.1 Overview
7A.2 General
7A.2.1 Defining primary and secondary voltages
7A.2.2 Normal service conditions of the network
52 7A.2.3 Abnormal service conditions of the network
7A.2.4 Steady-state conditions
7A.3 Transient conditions
7A.3.1 Theoretical considerations
7A.3.1.1 Network phenomena
53 7A.3.1.2 Types of transient conditions
55 7A.3.1.3 Equations of up(t) and us(t)
57 7A.3.1.4 Simple modelization of the LPVT
58 7A.3.1.5 Effects of transients on protective relays
7A.3.2 Definition of transient error
7A.3.3 Test of transient performance
7A.3.3.1 Transient performance test for capacitive voltage transformers
7A.3.3.2 Transient performance test for low-power voltage transformers
63 Annex 7B Correction procedures for low power voltage transformers (informative)
7B.1 Using the ratio and phase correction
64 7B.2 Accuracy class based on corrected secondary signal
7B2.1 Definitions
7B2.1.1 Definitions related to accuracy
7B2.1.1.1
7B2.1.1.2
7B2.1.1.3
65 7B2.1.1.4
7B2.1.2 Definitions related to secondary signal correction
7B2.1.2.1
7B2.1.2.2
7B2.1.2.3
7B2.1.2.4
66 7B2.1.2.5
7B2.1.2.6
7B2.2 Accuracy based on corrected analogue secondary signal
67 7B2.3 Test for accuracy
7B2.3.1 Accuracy tests using corrected analogue secondary signal
7B2.3.2 Temperature cycle accuracy test
7B2.3.3 Test for impact of magnetic field at rated frequency from other phases
68 Annex 7C Impact of electric field at rated frequency from other phases (informative)
7C.1 Extension of validity of test for impact of electric field at rated frequency from other phases for AIS LPVTs
69 Annex 7D Type of divider principles covered by IEC 61869-7 (informative)

Related products

BSI 24/30496142 DC
$13.70