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eLibrary > BS EN IEC 61557-12:2022 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures - Power metering and monitoring devices (PMD) >

BS EN IEC 61557-12:2022 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures - Power metering and monitoring devices (PMD), 2022

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BS EN IEC 61557-12:2022 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures - Power metering and monitoring devices (PMD), 2022

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
Annex ZZ (informative)Relationship between this European standard and the safety objectives of Directive 2014/35/EU [2014 OJ L96] aimed to be covered [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and notations [Go to Page]
3.1 General definitions
3.2 Definitions related to uncertainty and performance
3.3 Definitions related to electric phenomena
3.4 Definitions related to measurement techniques
3.5 Notations [Go to Page]
3.5.1 Functions
3.5.2 Symbols and abbreviations
3.5.3 Indices
4 Requirements [Go to Page]
4.1 General requirements
4.2 PMD general architecture
4.3 Classification of PMD
Figures [Go to Page]
Figure 1 – PMD generic measurement chain
Tables [Go to Page]
Table 1 – Functional classification of PMD with minimal required functions
4.4 Structure of PMD [Go to Page]
4.4.1 Structure of PMD related to sensors
4.4.2 Requirements for self-powered PMD
Figure 2 – Description of different types of PMD
Table 2 – Structure of PMD
4.5 List of applicable performance classes
4.6 Operating and reference conditions for PMD [Go to Page]
4.6.1 Reference conditions
Table 3 – List of applicable performance classes [Go to Page]
4.6.2 Rated operating conditions
Table 4 – Reference conditions for testing
Table 5 – Rated operating temperatures for portable equipment
Table 6 – Rated operating temperatures for fixed installed equipment
Table 7 – Humidity and altitude operating conditions
4.7 Start-up conditions
4.8 Requirements for PMD functions [Go to Page]
4.8.1 General requirements
Figure 3 – Relationship between ambient air temperature and relative humidity [Go to Page]
4.8.2 Active power (P) and active energy (Ea) measurements
Table 8 – Intrinsic uncertainty table for active power and active energy measurement
Table 9 – Influence quantities for active power and active energy measurement (1 of 3)
Table 10 – Minimum test period [Go to Page]
4.8.3 Reactive power (QA, QV) and reactive energy (ErA, ErV) measurements
Table 11 – Starting current for active power and active energy measurement
Table 12 – Intrinsic uncertainty table for reactive power and reactive energy measurement
Table 13 – Influence quantities for reactive power and reactive energy measurement
Table 14 – Minimum test period [Go to Page]
4.8.4 Apparent power (SA, SV) and apparent energy (EapA, EapV) measurements
Table 15 – Starting current for reactive energy measurement
Table 16 – Intrinsic uncertainty table for apparent power and apparent energy measurement
Table 17 – Influence quantities for apparent power and apparent energy measurement [Go to Page]
4.8.5 Frequency (f) measurements
Table 18 – Intrinsic uncertainty table for frequency measurement [Go to Page]
4.8.6 RMS phase current (I) and neutral current (IN, INc) measurements
Table 19 – Influence quantities for frequency measurement
Table 20 – Rated range of operation for phase current measurement
Table 21 – Rated range of operation for neutral current (calculated or measured)
Table 22 – Intrinsic uncertainty table for phase current
Table 23 – Intrinsic uncertainty table for neutral current measurement
Table 24 – Intrinsic uncertainty table for neutral current calculation
Table 25 – Influence quantities for phase current and neutral current measurement [Go to Page]
4.8.7 RMS voltage (U) measurements
Table 26 – Rated range of operation for RMS voltage measurement
Table 27 – Intrinsic uncertainty table for RMS voltage measurement
Table 28 – Influence quantities for RMS voltage measurement [Go to Page]
4.8.8 Power factor (PFA, PFV) measurements
4.8.9 Short term flicker (Pst) and long term flicker (Plt) measurements
Table 29 – Intrinsic uncertainty table for power factor measurement [Go to Page]
4.8.10 Voltage dip (Udip) and voltage swell (Uswl) measurements
Table 30 – Intrinsic uncertainty table for flicker measurement
Table 31 – Rated range of operation for voltage dips and swells measurement
Table 32 – Intrinsic uncertainty table for voltage dips and swells measurement
Table 33 – Influence quantities for dips and swells measurement [Go to Page]
4.8.11 Voltage interruption (Uint) measurements
4.8.12 Transient overvoltage (Utr) measurements
4.8.13 Voltage unbalance (Unb, Unba) measurements
Table 34 – Intrinsic uncertainty table for voltage interruption measurement
Table 35 – Intrinsic uncertainty table for transient overvoltage measurement [Go to Page]
4.8.14 Voltage harmonics (Uh) and voltage THD (THDu and THD-Ru) measurements
Table 36 – Intrinsic uncertainty table for voltage unbalance measurement
Table 37 – Rated range of operation for voltage harmonics measurement
Table 38 – Intrinsic uncertainty table for voltage harmonics measurement [Go to Page]
4.8.15 Current unbalance (Inb, Inba) measurements
Table 39 – Intrinsic uncertainty table for voltage THDu or THD-Ru measurement
Table 40 – Intrinsic uncertainty table for current unbalance measurement [Go to Page]
4.8.16 Current harmonics (Ih) and current THD (THDi and THD-Ri) measurements
Table 41 – Rated range of operation for current harmonics measurement
Table 42 – Intrinsic uncertainty table for current harmonics measurement
Table 43 – Intrinsic uncertainty table for current THDi and THD-Ri measurement [Go to Page]
4.8.17 Minimum, maximum, peak, three-phases average and demand measurements
4.9 General mechanical requirements [Go to Page]
4.9.1 Vibration requirements
4.9.2 IP requirements
Table 44 – Minimum IP requirements for PMD
4.10 Safety requirements [Go to Page]
4.10.1 Protection against electrical hazards
4.10.2 Protection against mechanical hazards
4.10.3 Protection against other hazards
4.11 EMC requirements [Go to Page]
4.11.1 Immunity
4.11.2 Emission
4.12 Inputs and/or outputs [Go to Page]
4.12.1 General
4.12.2 Analog outputs
4.12.3 Pulse outputs
4.12.4 Control outputs
4.12.5 Analog inputs
4.12.6 Pulse and control inputs
5 Marking and operating instructions [Go to Page]
5.1 General
5.2 Marking
5.3 Operating, installation and maintenance instructions [Go to Page]
5.3.1 General
5.3.2 General characteristics
5.3.3 Essential characteristics
Table 45 – PMD specification form
6 Tests [Go to Page]
6.1 General
Table 46 – Characteristics specification template
6.2 Type tests of PMD [Go to Page]
6.2.1 General
6.2.2 Tests of intrinsic uncertainty
6.2.3 Tests of variation of uncertainty with influence quantities
6.2.4 Test of temperature influence
6.2.5 Active power
Figure 4 – Waveform for odd harmonics influence test on active power measurement
Figure 5 – Spectral content for odd harmonics influence teston active power measurement [Go to Page]
6.2.6 Apparent power
Figure 6 – Waveform for sub-harmonics influence test onactive power measurement
Figure 7 – Spectral content for sub-harmonics influence teston active power measurement [Go to Page]
6.2.7 Power factor
6.2.8 Common mode voltage rejection test
6.2.9 Frequency
Figure 8 – Common mode voltage influence testing [Go to Page]
6.2.10 Measurement of voltage harmonics and THDu
6.2.11 Measurement of current harmonics and THDi
Figure 9 – Waveform for harmonics influence teston frequency measurement [Go to Page]
6.2.12 Dips and swells
6.2.13 Voltage interruptions
6.2.14 Outputs tests
6.2.15 Climatic tests
6.2.16 EMC tests
6.2.17 Start-up tests
6.2.18 Gapless measurement test
6.2.19 Safety tests
6.3 Routine tests [Go to Page]
6.3.1 Protective bonding test
6.3.2 Dielectric strength test
6.3.3 Uncertainty test
Annexes [Go to Page]
Annex A (informative) Metering, measuring and monitoring applications [Go to Page]
A.1 Applications on demand side and supply side
A.2 Link between applications, devices and standards
Figure A.1 – Simplified overview of measurement applications onsupply side and demand side
Table A.1 – Main measurement applications
Annex B (informative) Definitions of electrical parameters [Go to Page]
B.1 General
B.2 Definitions in the presence of a neutral
Table B.1 – Definition of symbols
Table B.2 – Calculation definitions for electrical parameters [Go to Page]
B.3 Power measurement in three-phase three-wire systems using the two-wattmeter method [Go to Page]
B.3.1 General
Figure B.1 – Arithmetic and vector apparent powers in sinusoidal situation [Go to Page]
[Go to Page]
B.3.2 Total active power
B.3.3 Total vector reactive power using quadrature phase shift definition
Figure B.2 – Three-phase circuit without neutral [Go to Page]
[Go to Page]
B.3.4 Total vector reactive power using Budeanu’s definition
B.4 Additional relationships in case of sinusoidal voltage
Annex C (informative) Convention about the sign of the power factor [Go to Page]
C.1 General
C.2 Convention for power factor (consumer perspective)
Figure C.1 – Formatting of power factor with a consumer perspective [Go to Page]
C.3 Convention for power factor (producer reference frame)
Figure C.2 – Convention for power factor with a producer perspective
Table C.1 – Conventions for the sign of Power factorwith a Consumer perspective
Table C.2 – Conventions for the sign of power factor with a producer perspective
Annex D (normative) Definitions of minimum, maximum, peak and demand values [Go to Page]
D.1 Demand quantities [Go to Page]
D.1.1 General
D.1.2 Power demand
D.1.3 Current demand
D.1.4 Thermal current demand (or bi-metal current demand)
D.1.5 Specified intervals for demand calculation
Figure D.1 – Thermal current demand [Go to Page]
D.2 Peak demand quantities
D.3 Three-phase average quantities
D.4 Maximum and minimum quantities
Figure D.2 – Fixed block interval
Figure D.3 – Sliding block interval
Annex E (informative) Intrinsic uncertainty and operating uncertainty [Go to Page]
E.1 General
E.2 Operating uncertainty calculation
Figure E.1 – Different kinds of uncertainties
Figure E.2 – Flowchart for the determination of the operating uncertainty
Annex F (informative) Recommended sensor classes for the different kinds of PMD [Go to Page]
F.1 General considerations
F.2 Specific case of an active power and energy measurement, achieved by a PMD associated with an external current sensor or/and a voltage sensor
F.3 List of functions affected by uncertainty of external sensors
Table F.1 – PMD SD associated with current sensor or PMD DS associated with voltage sensor or PMD SS associated with voltage and current sensors
Table F.2 – List of functions affected by uncertainty of external sensors
Annex G (informative)Notion of measurement uncertainty [Go to Page]
G.1 General considerations
G.2 Computing the expanded uncertainty [Go to Page]
G.2.1 General
G.2.2 Estimated standard deviation
G.2.3 Expanded uncertainty
Table G.1 – Correction factor C(N) for sample size N [Go to Page]
G.3 Determining the measurement uncertainty [Go to Page]
G.3.1 Systematic error
G.3.2 Measurement uncertainty
Figure G.1 – Illustration of the notion of measurement uncertainty [Go to Page]
G.4 Using the measurement uncertainty as a pass/fail criterion [Go to Page]
G.4.1 Intrinsic uncertainty tests
G.4.2 Tests with influence quantities
G.4.3 Overall pass/fail criterion
Figure G.2 – Overview of the uncertainty test procedure
Bibliography [Go to Page]

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BS EN IEC 61557-12:2022 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures - Power metering and monitoring devices (PMD), 2022

⨯To continue with accurate pricing,
please select your company type below: