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eLibrary > 15/30328086 DC BS EN 61557-12. Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 12. Power metering and monitoring devices (PMD) >

15/30328086 DC BS EN 61557-12. Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 12. Power metering and monitoring devices (PMD), 2015

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15/30328086 DC BS EN 61557-12. Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 12. Power metering and monitoring devices (PMD), 2015

85_518e_CD.pdf [Go to Page]
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General definitions [Go to Page]
3.1.1
Power metering and monitoring device
PMD (abbreviation)
3.1.2
power quality assessment functions
3.1.3
Supply side
3.1.4
Demand side
3.1.5
Point of common coupling
PCC (abbreviation) [Go to Page]
3.1.6
Power Quality
3.1.7
specified external sensor
3.1.8
current sensor
3.1.9
compliance voltage
3.1.10
voltage sensor
3.1.11
self-powered PMD
3.1.12
auxiliary power supply
3.2 Definitions related to uncertainty and performance [Go to Page]
3.2.1
reference conditions
3.2.2
mesurand
3.2.3
uncertainty
3.2.4
intrinsic uncertainty
3.2.5
influence quantity
3.2.6
variation (due to a single influence quantity)
3.2.7
(rated) operating conditions
3.2.8
operating uncertainty
3.2.9
overall system uncertainty
3.2.10
function performance class
3.2.11
system performance class
3.2.12
rated frequency
fn
3.2.13
rated current
In
3.2.14
basic current
Ib
3.2.15
starting current
Ist
3.2.16
maximum current
Imax
3.2.17
rated voltage
Un
3.2.18
nominal voltage
Unom
3.2.19
minimum voltage
Umin
3.2.20
maximum voltage
Umax
3.2.21
residual voltage
Ures
3.2.22
declared input voltage
3.2.23
3.2.24
3.2.25
3.2.26
3.2.27
3.2.28
3.2.29
3.2.30
3.3 Definitions related to electric phenomena [Go to Page]
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.3.10
3.3.11
3.3.12
3.3.13
3.3.14
3.3.15
3.3.16
3.3.17
3.3.18
3.3.19
3.3.20
3.3.21
3.4 Definitions related to measurement techniques [Go to Page]
3.4.1
3.4.2
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
4.4 Structure of PMD
4.5 List of applicable performance classes [Go to Page]
4.5.1 List of applicable function performance classes for PMD without external sensors
4.5.2 List of applicable system performance classes for PMD with external sensors
4.6 Operating and reference conditions for PMD [Go to Page]
4.6.1 Reference conditions
4.6.2 Rated operating conditions [Go to Page]
4.6.2.1 Rated temperature operating conditions for portable equipment
4.6.2.2 Rated temperature operating conditions for fixed installed equipment
4.6.2.3 Rated humidity and altitude operating conditions
4.7 Start-up conditions
4.8 Requirements for PMD functions [Go to Page]
4.8.1 General requirements [Go to Page]
4.8.1.1 Coverage requirements
4.8.1.2 Requirements on the measurement window
4.8.2 Active power (P) and active energy (Ea) measurements [Go to Page]
4.8.2.1 Techniques
4.8.2.2 Rated range of operation
4.8.2.3 Intrinsic uncertainty table
4.8.2.4 Limits of variations due to influence quantities
4.8.2.5 Starting and no-load condition [Go to Page]
4.8.2.5.1 Start-up of the PMD
4.8.2.5.2 No load condition (only for energy measurement)
4.8.2.5.3 Starting current
4.8.3 Reactive power (QA, QV) and reactive energy (ErA, ErV) measurements [Go to Page]
4.8.3.1 Techniques
4.8.3.2 Rated range of operation
4.8.3.3 Intrinsic uncertainty table
4.8.3.4 Limits of variation due to influence quantities
4.8.3.5 Starting and no-load condition [Go to Page]
4.8.3.5.1 Start-up of the PMD
4.8.3.5.2 No load condition
4.8.3.5.3 Starting current
4.8.4 Apparent power (SA, SV) and apparent energy (EapA, EapV) measurements [Go to Page]
4.8.4.1 Techniques
4.8.4.2 Rated range of operation
4.8.4.3 Intrinsic uncertainty table
4.8.4.4 Limits of variation due to influence quantities
4.8.5 Frequency (f) measurements [Go to Page]
4.8.5.1 Techniques
4.8.5.2 Rated range of operation
4.8.5.3 Intrinsic uncertainty table
4.8.5.4 Limits of variation due to influence quantities
4.8.6 R.m.s. phase current (I) and neutral current (IN, INc) measurements [Go to Page]
4.8.6.1 Techniques
4.8.6.2 Rated range of operation [Go to Page]
4.8.6.2.1 Rated range of operation for phase current
4.8.6.2.2 Rated range of operation for measured neutral current (with a sensor) and calculated neutral current (from phase currents)
4.8.6.3 Intrinsic uncertainty table [Go to Page]
4.8.6.3.1 Intrinsic uncertainty table for phase current
4.8.6.3.2 Intrinsic uncertainty table for measured neutral current (with a sensor)
4.8.6.3.3 Intrinsic uncertainty table for calculated neutral current (from phase currents)
4.8.6.4 Limits of variation due to influence quantities
4.8.7 R.m.s. voltage (U) measurements [Go to Page]
4.8.7.1 Technique
4.8.7.2 Rated range of operation
4.8.7.3 Intrinsic uncertainty table
4.8.7.4 Limits of variation due to influence quantities
4.8.8 Power factor (PFA, PFV) measurements [Go to Page]
4.8.8.1 Techniques
4.8.8.2 Rated range of operation
4.8.8.3 Intrinsic uncertainty table
4.8.8.4 Limits of variation due to influence quantities
4.8.9 Short term flicker (Pst) and long term flicker (Plt) measurements [Go to Page]
4.8.9.1 Techniques
4.8.9.2 Rated range of operation
4.8.9.3 Intrinsic uncertainty table
4.8.10 Voltage dip (Udip) and voltage swell (Uswl) measurements [Go to Page]
4.8.10.1 Measurement method
4.8.10.2 Detection and evaluation of a voltage dip [Go to Page]
4.8.10.2.1 Voltage dip detection
4.8.10.2.2 Voltage dip evaluation
4.8.10.3 Detection and evaluation of a voltage swell [Go to Page]
4.8.10.3.1 Voltage swell detection
4.8.10.3.2 Voltage swell evaluation
4.8.10.4 Calculation of a sliding reference voltage
4.8.10.5 Measurement uncertainty and measuring range [Go to Page]
4.8.10.5.1 Residual voltage and swell voltage magnitude measurement uncertainty
4.8.10.5.2 Duration measurement uncertainty
4.8.10.6 Rated range of operation
4.8.10.7 Intrinsic uncertainty table
4.8.10.8 Limits of variation due to influence quantities
4.8.11 Voltage interruption (Uint) measurements [Go to Page]
4.8.11.1 Measurement method
4.8.11.2 Evaluation of a voltage interruption
4.8.11.3 Measurement uncertainty and measuring range
4.8.11.4 Rated range of operation
4.8.11.5 Intrinsic uncertainty table
4.8.12 Transients overvoltage (Utr) measurements [Go to Page]
4.8.12.1 Techniques
4.8.12.2 Rated range of operation
4.8.12.3 Intrinsic uncertainty table
4.8.13 Voltage unbalance (Unb, Unba, Vnb, Vnba) measurements [Go to Page]
4.8.13.1 Techniques
4.8.13.2 Rated range of operation
4.8.13.3 Intrinsic uncertainty table
4.8.14 Voltage harmonics (Uh) and voltage THD (THDu and THD-Ru) measurements [Go to Page]
4.8.14.1 Techniques
4.8.14.2 Rated range of operation
4.8.14.3 Intrinsic uncertainty table
4.8.15 Current unbalance (Inb, Inba) measurements [Go to Page]
4.8.15.1 Techniques
4.8.15.2 Rated range of operation
4.8.15.3 Intrinsic uncertainty table
4.8.16 Current harmonics (Ih) and current THD (THDi and THD-Ri) measurements [Go to Page]
4.8.16.1 Techniques
4.8.16.2 Rated range of operation
4.8.16.3 Intrinsic uncertainty table
4.8.17 Minimum, maximum, peak, three-phases average and demand measurements [Go to Page]
4.8.17.1 Rated range of operation
4.8.17.2 Intrinsic uncertainty table
4.9 General mechanical requirements [Go to Page]
4.9.1 Vibration requirements
4.9.2 IP requirements
4.10 Safety requirements [Go to Page]
4.10.1 Clearances and creepage distances
4.10.2 Connection of a fixed installed PMD with a current transformer
4.10.3 Connection of a PMD with a sensor in high voltage networks
4.10.4 Accessible parts
4.10.5 Hazardous live parts
4.11 Inputs and/or outputs [Go to Page]
4.11.1 Analog outputs [Go to Page]
4.11.1.1 General requirements
4.11.1.2 Compliance voltage
4.11.1.3 Analog output ripple content
4.11.1.4 Analog output response time
4.11.1.5 Limiting value of the analog output signal
4.11.2 Pulse outputs
4.11.3 Control outputs
5 Marking and operating instructions [Go to Page]
5.1 Marking
5.2 Operating and installation instructions [Go to Page]
5.2.1 General characteristics
5.2.2 Essential characteristics [Go to Page]
5.2.2.1 Characteristics of PMD
5.2.2.2 Characteristics of functions
5.2.3 Safety characteristics [Go to Page]
5.2.3.1 Insulation between circuits
6 Tests [Go to Page]
6.1 Type tests of PMD [Go to Page]
6.1.1 Tests of intrinsic uncertainty [Go to Page]
6.1.1.1 General requirements
6.1.1.2 Minimum test points
6.1.1.3 Acceptance criterion
6.1.2 Tests of variation of uncertainty with influence quantities [Go to Page]
6.1.2.1 General requirements
6.1.2.2 Minimum test points
6.1.2.3 Acceptance criterion
6.1.3 Test of temperature influence
6.1.4 Active power [Go to Page]
6.1.4.1 Influence of harmonics in current and voltage circuits
6.1.4.2 Influence of odd harmonics in the current circuit
6.1.4.3 Influence of sub-harmonics
6.1.5 Apparent power
6.1.6 Power factor
6.1.7 Common mode voltage rejection test
6.1.8 Frequency
6.1.9 Measurement of voltage harmonics [Go to Page]
6.1.9.1 Test with a sinusoidal waveform
6.1.9.2 Test with a square waveform
6.1.10 Measurement of current harmonics [Go to Page]
6.1.10.1 Test with a sinusoidal waveform
6.1.10.2 Test with a square waveform
6.1.11 Dips and swells
6.1.12 Voltage interruptions
6.1.13 Outputs tests [Go to Page]
6.1.13.1 General
6.1.13.2 Test of compliance voltage and effect of variation of load.
6.1.13.3 Test of ripple content
6.1.13.4 Tests of analog output response time
6.1.13.5 Test of limit value of analog output
6.1.14 Climatic tests [Go to Page]
6.1.14.1 Dry heat test
6.1.14.2 Cold test
6.1.14.3 Damp heat cyclic test
6.1.15 EMC tests
6.1.16 Start-up tests
6.1.17 Zero blind measurement test
6.2 Routine tests [Go to Page]
6.2.1 Protective bonding test
6.2.2 Dielectric strength test
6.2.3 Uncertainty test
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
Annex B (informative) Definitions of electrical parameters [Go to Page]
B.1 Definitions in the presence of a Neutral
B.2 Power measurement in three-phase three-wire systems using the two-wattmeter method [Go to Page]
B.2.1 General
B.2.2 Total active power
B.2.3 Total vector reactive power using quadrature phase shift definition
B.2.4 Total vector reactive power using Budeanu’s definition
B.3 Additional relationships in case of sinusoidal voltage
Annex C (informative) Convention about the sign of Power factor [Go to Page]
C.1 General
C.2 Convention for Power factor (Consumer prospective)
C.3 Convention for Power factor (Producer reference frame)
Annex D (normative) Definitions of minimum, maximum, peak and demand values [Go to Page]
D.1 Demand quantities [Go to Page]
D.1.1 Power demand
D.1.2 Current demand
D.1.3 Thermal current demand (or bi-metal current demand)
D.1.4 Specified intervals for demand calculation
D.2 Peak demand quantities
D.3 Three-phases average quantities
D.4 Maximum and minimum quantities
Annex E (informative) Recommended sensor classes for the different kinds of PMD [Go to Page]
E.1 General considerations
E.2 PMD with external current sensor or voltage sensor
E.3 PMD with external current sensor and voltage sensor
E.4 Range of applicable performance classes
E.5 List of functions affected by uncertainty of external sensors
Annex F (informative) Intrinsic uncertainty, operating uncertainty, and overall system uncertainty [Go to Page]
F.1 Operating uncertainty
F.2 Overall system uncertainty
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 Estimated standard deviation
G.2.2 Expanded uncertainty
G.2.3 Uncertainty as a measure of precision
G.3 Determining the measurement uncertainty [Go to Page]
G.3.1 Systematic error as a measure of accuracy
G.3.2 Combination of accuracy and precision into an overall measurement accuracy
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 [Go to Page]

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15/30328086 DC BS EN 61557-12. Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 12. Power metering and monitoring devices (PMD), 2015

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please select your company type below: