Download FDJP Ordinance on Electrical Energy and Power Measuring

1. ------IND- 2014 9504 CH- EN- ------ 20140710 --- --- PROJET
FDJP Ordinance
on Electrical Energy and Power Measuring Instruments
(OIMepe)
of ...
The Federal Department of Justice and Police (FDJP),
having regard to Art. 5, subpara. 2; Art. 11, subpara. 2; Art. 16, subpara. 2; Art. 17,
subpara. 2;
Art. 24, subparas 3 and 33 of the Ordinance of 15 February 2006 on Measuring
Instruments (Ordinance on Measuring Instruments)1,
hereby order:
Section 1
General provisions
Art. 1
Purpose
This Ordinance establishes the:
a. requirements relating to electricity meters and measuring transformers;
b. procedures for placing these measuring instruments on the market;
c. procedures intended to maintain the stability of measurement of these
instruments.
Art. 2
Scope
The following are subject to the provisions of this Ordinance:
a. Electricity meters intended to measure the consumption or supply of
electricity in households, arts and trades or light industry;
b. measuring transformers
with a maximum operating voltage
Um of maximum 52 kV, as well as current transformers with a maximum
current In of 5 kA intended to be installed at the input to electricity meters as
per letter a.
SR ........
1
SR 941.210
2014-........
1
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Definitions
Art. 3
1
For the purposes of this Ordinance, the following definitions apply:
a.
electricity meter: an instrument for the continuous measurement of
electricity consumed or supplied by a current circuit;
b.
active electrical energy meter: an electricity meter determining the active
electrical energy consumed or supplied;
c.
measuring transformer: a measuring instrument placed on the alternating
current network to reduce high voltages and currents to magnitudes that can
be measured directly by the electricity meter;
d.
current transformer: a measuring transformer which transforms the intensity
of the current;
voltage transformer: a measuring transformer which transforms the voltage.
e.
2
Different functions may be combined in a single measuring instrument, so that it
falls within a number of the categories mentioned in subpara. 1.
Section 2
Electricity meters
Art. 4
Essential requirements
Electricity meters must meet the essential requirements laid down in Annex 1 of the
Ordinance on Measuring Instruments. In addition, active energy meters must meet
the requirements set out in Annex 1, and electricity meters other than active energy
meters must meet the requirements set out in Annex 2 of this Ordinance.
Art. 5
Procedure for placement on the market
The compliance of energy meters with the essential requirements mentioned in Art.
4 may be assessed and certified by the manufacturer's choice of one of the following
procedures provided for in Annex 2 of the Ordinance on Measuring Instruments:
a.
type examination (module B) supplemented by the declaration of conformity
to type based on quality assurance of the production process (module D);
b.
type examination (module B) supplemented by the declaration of conformity
to type based on product verification (module F);
c.
declaration of conformity based on full quality assurance plus design
inspection (module H1).
Art. 6
2
Procedure for maintaining stability of measurement
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
1
Electricity meters with an electronic measuring device must undergo a subsequent
verification in accordance with Annex 7, Ch. 1 of the Ordinance on Measuring
Instruments, carried out every ten years by METAS or by an authorised verification
laboratory.
2
Electricity meters with an electromechanical measuring device must undergo a
subsequent verification in accordance with Annex 7, Ch. 1, of the Ordinance on
Measuring Instruments, carried out every 15 years by METAS or by an authorised
verification laboratory.
3
When it is not possible to guarantee compliance with the requirements or type
conformity in accordance with Art. 4, the set intervals may be reduced, with
additional statistical controls where applicable. METAS shall decide on the
procedure and possible reductions of the verification interval.
4
Electricity meters may, on the user's request, undergo the statistical control
procedure as per Annex 4 of this Ordinance. Electricity meters undergoing the
statistical control procedure retain their validity from the verification as long as the
electricity meters in the sample fulfil the requirements laid down in Annex 4, Ch. 5.
Electricity meters already having undergone the statistical procedure once are
excluded from this procedure and transferred to the periodic inspection procedure as
per subpara. 1 or subpara. 2.
Art. 7
Accuracy classes
1
For the measurement of active energy consumption in households, active electrical
energy meters in accuracy classes A, B and C may be used.
2
For the measurement of active energy consumption in the arts, trades and light
industry, electrical energy meters in accuracy classes A, B and C may be used.
Section 3
Measuring transformers
Art. 8
Essential requirements
Measuring transformers must meet the essential requirements laid down in Annex 1
of the Ordinance on Measuring Instruments and Annex 3 of this Ordinance.
Art. 9
Procedures for placement on the market
Measuring transformers are subject to the ordinary approval and the initial
verification provided for in Annex 5 of the Ordinance on Measuring Instruments.
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Art. 10
Procedures for maintaining stability of measurement
3
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
1
Solid-core inductive measuring transformers must undergo subsequent verification
in accordance with Annex 7, Ch. 1, of the Ordinance on Measuring Instruments,
carried out every 50 years by METAS or by an authorised verification laboratory.
2
Other measuring transformers must undergo subsequent verification in accordance
with Annex 7, Ch. 1 of the Ordinance on Measuring Instruments, conducted every 2
years by METAS or by an authorised verification laboratory, provided that METAS
has not set different intervals for certain types of meters.
3
A subsequent verification is necessary after each intervention on the active
part.
Section 4
Obligations of the user
Art. 11
Assembly, commissioning and maintenance of measuring instruments
The user takes assumes the responsibility specified in Art. 21, subpara. 1, of the
Ordinance on Measuring Instruments, but also that of:
a.
complying with the manufacturer's instructions for the assembly and
commissioning of the measuring instrument, and trusting the assembly to
people with the requisite technical skills;
b.
maintaining the measuring instrument and periodically inspecting the parts
subject to wear and ageing.
Art. 12
Measuring units
1
Measuring units including electricity meters and transformers must be adjusted
such that the energy needed to operate the measuring device is not measured.
2
If measuring instruments have to be connected contrary to subpara. 1, the
consumption of the measuring installation itself should not lead to energy
consumption being displayed.
3
The additional error caused by connecting cables and the loads of transformers in
measuring groups should not exceed 20% of the maximum permissible error of the
meter.
Art. 13
Control register
1
Users shall maintain an up-to-date control register of the measuring instruments
used in their area of work.
2
For each measuring instrument, the register must state:
a. when and according to what procedure it was placed on the market;
b.
4
what procedure is recommended for maintaining its stability of
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
measurement;
c.
when the stability of measurement maintenance procedure was last carried
out;
d.
where it is in operation.
3
The energy consumers concerned and the bodies responsible for carrying out the
subsequent inspection may consult the register at any time agreed with the registrar.
4
The registers must be kept following expiry of the validity of the last verification
for as long as there are outstanding debts, but for at least five calendar years.
Section 5
Final provisions
Art. 14
Repeal of the law in force
The FDJP Ordinance of 19 March 2006 on Electrical Energy and Power Measuring
Instruments2 is hereby repealed.
Art. 15
Transitional provisions
1 Electricity meter verifications carried out before the entry into force of this
Ordinance shall remain valid for the period specified under the old law.
2
Verifications of measuring transformers carried out prior to the entry into force of
this Ordinance shall remain valid for 50 years from the entry into force of this
Ordinance.
3
Electricity meters and measuring transformers which were approved before 30
October 2006 under the old law may be placed on the market and undergo the initial
verification provided for in accordance with Annex 5, Ch. 2 of the Ordinance on
Measuring Instruments until 29 October 2016. Beyond the above-mentioned
deadline, and subject to subparagraphs 1 and 2, they remain subject to the provisions
of this Ordinance relating to maintaining stability of measurement.
4
Electricity meters and measuring transformers, approved before 29 October 2006
under the old law, may continue to be placed on the market and undergo the initial
verification in accordance with Annex 5, Ch. 2, of the Ordinance on Measuring
Instruments until expiry of the approval. Beyond the above-mentioned deadline, and
subject to subparagraphs 1 and 2, they remain subject to the provisions of this
2
RO 2006 1613, 2012 7183
5
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Ordinance relating to maintaining stability of measurement.
5
Electricity meters with power measurement functionality or load curve generation
functionality may be placed on the market until 31 December 2016, even if they do
not comply with the requirements of this Ordinance with regard to these functions.
After that date, they shall be subject to the provisions of this Ordinance relating to
maintaining stability of measurement (Art. 6). After 31 December 2016, the
measurement stability maintenance procedure applicable to these functions shall be
carried out for the first time together with the next measurement stability
maintenance procedure applicable to the other functions.
6
The accuracy classes of active energy meters valid prior to the entry into force of
this Ordinance correspond to the following classes under this Ordinance:
a. Class 2 corresponds to Class A;
b.
Class 1 corresponds to Class B;
c.
Class 0.5 S corresponds to Class C;
d.
Class 0.2 S corresponds to Class C.
7
For active energy meters subject to statistical control at the time of entry into force
of this Ordinance:
a.
Batches are maintained, even if they do not meet the requirements of Annex
4, Ch. 1.2;
b.
the examination points and maximum permissible errors defined under the
old law remain valid until the second sample check following the entry into
force of this Ordinance.
Art. 16
Entry into force
This Ordinance shall enter into force on 1 January 2015.
...
Federal Department of Justice and Police:
Simonetta Sommaruga
6
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Annex 1
(Art. 4)
Specific requirements relating to active energy meters
A
Definitions
I
= measurand connected to the meter input, proportional to the current through
the meter in the current circuit;
Ist
= value of I declared the lowest at which the meter registers active electrical
energy at unit power factor FP = 1 (polyphase meters with balanced load);
Imin = value of I above which the error falls within the maximum permissible errors
corresponding to the accuracy class of the meter (polyphase meters with
balanced load);
Itr
= value of I above which the error falls within the lowest maximum permissible
errors corresponding to the accuracy class of the meter;
In
= specified reference current for which the transformer operated meter was
designed;
I6
= reference current of I for which the directly connected meter was designed (I6
= 10 Itr);
Imax = maximum value of I for which the error falls within the maximum permissible
errors;
U
= measurand connected to the meter inputs, proportional to the voltage in the
current circuit;
Un
f
fn
FP
φ
= reference voltage of U;
B
1
= frequency of the voltage supplied to the meter;
= reference frequency of f;
= power factor cos φ;
= phase difference φ, between I and U.
Specific requirements
Accuracy classes
The manufacturer must specify the accuracy class of the meter. The accuracy
classes are: A, B and C.
7
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
2
Nominal operating conditions
The manufacturer must in particular specify the following nominal operating
conditions for the meter:
The values of fn, Un, In, Ist, Imin, Itr and Imax that apply to the meter. For the
specified current values, the meter must fulfil the conditions indicated in
Table 1.
Table 1
Class A
Class B
Class C
Directly connected meters
Ist
≤ 0.05 Itr
≤ 0.04 Itr
≤ 0.04 Itr
Imin
≤ 0.5 Itr
≤ 0.5 Itr
≤ 0.3 Itr
Imax
≥ 50 Itr
≥ 50 Itr
≥ 50 Itr
Meters on measuring transformers
Ist
≤ 0.06 Itr
≤ 0.04 Itr
≤ 0.02 Itr
Imin
≤ 0.4 Itr
≤ 0.2 Itr*
≤ 0.2 Itr
In
= 20 Itr
= 20 Itr
= 20 Itr
Imax
≥ 1.2 In
≥ 1.2 In
≥ 1.2 In
*The value Imin ≤ 0.4 Itr applies to Class B electromechanical meters.
They must also indicate the range of voltages, frequencies and power factors
within which the meter must satisfy the requirements for maximum
permissible errors specified in Table 2. These ranges must reflect the typical
characteristics of electricity supplied by public distribution systems.
The voltage and frequency values must fall within the following limits:
0.9 Un < U < 1.1 Un;
0.98 fn < f < 1.02 fn.
The power factor shall fall within the range cos φ = 0.5 (inductive) to cos φ =
0.8 (capacitive).
3
Maximum permissible errors (MPEs)
3.1
The effects of the various measurands and influence quantities (a, b, c, etc.)
are evaluated separately, all other measurands and influence quantities being
kept relatively constant at their reference value. The measurement deviation,
which must not exceed the MPE indicated in Table 2, is calculated as follows:
measurement
deviation =
8
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
3.2
When the meter is operating with variable load currents, the errors in % must
not exceed the limits indicated in Table 2.
Table 2: MPEs in % under nominal operating conditions, with charging
current and operating temperature defined.
Table 2
Operating temperatures
+5 °C to +30 °C
Meter class
A
B
C
–10 °C to +5 °C
or
+30 °C to +40 °C
A
B
C
-25 °C to +10 °C
or
+40 °C to +55 °C
A
B
C
Monophase meter; polyphase meter if it works with balanced loads
3.5 2
1
5 2.5 1.3 7 3.5 1.7
Imin ≤ I < Itr
7 3.5 1.3
3.5 2 0.7 4.5 2.5 1
Itr ≤ I < Imax
Polyphase meter, if it functions on a monophase load
4 2.5 1
5
3 1.3 7
4 1.7
Itr ≤ I < Imax*
-40 °C to -25 °C
or
+55 °C to +70 °C
A
B
C
9
9
4
4
2
1.5
9
4.5
2
* Exception: for electromechanical polyphase meters, the current range for
monophase loads is limited to 5 Itr ≤ I ≤ Imax .
When a meter operates in different temperature ranges, the relevant MPE
values shall apply.
3.3
The meter must neither exploit the MPEs nor systematically favour
one of the parts.
4
Permissible effect of disturbances
4.1
General aspects
For active energy meters, specific electromagnetic environmental conditions
must be fulfilled. The meters must satisfy E2 electromagnetic environmental
conditions and the additional requirements provided for in Ch.. 4.2 and 4.3.
Long-duration disturbances must not affect the accuracy of the meter beyond
the limit values in Ch. 4.2. Transient disturbances may cause a temporary
degradation, loss of function or power in the meter: following the
disturbance, the meter must re-establish function and power and its accuracy
must not exceed the limit values as per Ch. 4.3.
Where there are foreseeable high risks of lightning or a predominance of
overhead supply networks, the metrological characteristics of the meter must
be protected.
9
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
4.2
Effect of long-duration disturbances
Limit values for long-duration disturbances
Table 3
Perturbations
Inverted phase sequence
Voltage imbalance (only
applicable to polyphase
meters)
Harmonics in the current
circuits *
Direct current and harmonic
in the current circuit*
Bursts of rapid transients
Magnetic fields, HF
electromagnetic fields,
conduction disturbances
introduced by radio frequency
fields and immunity to
oscillating waves
*
Limit values in %
for meters in Class
A
1.5
4
B
1.5
2
C
0.3
1
1
0.8
0.5
6
3
1.5
6
3
4
2
2
1
for electromechanical electricity meters, no limit value is defined for
harmonics in the current circuits.
4.3
Permissible effect of transient electromagnetic phenomena
4.3.1
The effect of an electromagnetic disturbance on an electrical energy meter
shall be such that, during and immediately after a disturbance, no output
intended to test the accuracy of the meter shall produce pulses or signals
whose energy exceeds the critical variation value.
Within a reasonable time after the disturbance, the meter must:
–
re-establish function within the MPEs;
–
safeguard all measuring functions;
– enable the recovery of all measurement data gathered prior to the
disturbance;
– not indicate any variation in the energy registered that exceeds the critical
variation value.
The critical variation value expressed in kWh is: m × Un × Imax × 10-6, where
m is the number of measurement parameters of the meter; Un is expressed in
Volts and Imax in Amps.
10
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
4.3.2
For overcurrent, the limit value is 1.5%.
5
5.1
Adequacy
Below the nominal operating voltage the positive error of the meter must not
exceed 10%.
5.2
The total energy display must have a sufficient number of digits to ensure that
the indication does not return to its initial value when the meter is operated
for 4 000 hours at full load (I = Imax, U = Un and PF = 1), and must not be
able to return to zero in use.
5.3
In the event of power failure in the circuit, the amounts of electrical energy
measured must remain available for reading for at least four months.
5.4
No-load operation
If a voltage is applied without any current passing through the circuit (open
circuit), the meter must not register any energy for any voltage between 0.8
Un and 1.1 Un.
5.5
Starting the measurement
The meter must start and continue registering at U = Un FP = 1 (polyphase
computer with balanced loads) and a current equal to Ist.
6
Units
The electrical energy measured must be displayed in kilowatt-hours (kWh) or
in megawatt-hours (symbol MWh).
11
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Annex 2
(Art. 4)
Specific requirements for electricity meters other than active
energy meters
A
Definitions
1
I
Display of the result
= measurand connected at the meter input, proportional to the current flowing
through the meter in the current circuit;
Ist
= value of I declared the lowest at which the meter registers active electrical
energy at unit power factor PF = 1 (polyphase meters with balanced loads);
Imin = value of I above which the error falls within the MPEs corresponding to the
accuracy class (polyphase meters with balanced load);
Itr
= value of I above which the error falls within the lowest MPEs corresponding
to the accuracy class of the meter;
In
Ib
= reference current for which the transformer operated meter was designed;
Imax
U
Un
f
fn
FP
φ
B
1
= reference current I for which the directly supplied meter was designed (Ib = 10
Itr);
= maximum value of I for which the error falls within the MPEs;
= measurand connected to the meter input, proportional to the voltage in the
= reference frequency U;
= frequency of the voltage supplied to the meter;
= reference frequency f;
power factor
= phase difference φ, between I and U.
General aspects
Display of the result
1.1
Regarding measuring instruments that may be read remotely, it is possible to
omit the display system provided for in Annex 1, Ch. 10.5 OIMes, where the
measurement is made accessible to the consumer in another way.
1.2
If the display system provided for in Annex 1, Ch. 10.5 OIMes is omitted,
measurements taken prior to the remote reading may be used to determine the
12
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
price to be paid where there is a discrepancy.
2
Conformity mark
2.1
The following conformity mark, of minimum height 5 mm, shall replace the
mark provided for in Annex 4, Ch.1.1 OIMes.
2.2
The other provisions of Annex 4 OIMes shall apply.
C
Specific requirements for measuring reactive energy
1
Accuracy classes
The manufacturer must specify the accuracy class of the meter. The accuracy
classes for the measurement of reactive energy are: 3 and 2.
2
Nominal operating conditions
The manufacturer must in particular specify the following nominal operating
conditions for the meter:
The values fn, Un, In and respectively Ib, Ist, Imin and Imax that apply to the
meter. For the specified current values, the meter must meet the conditions
indicated in Table 1.
Table 1
Class 3
Class 2
Directly connected meter
Ist
≤ 0.01 Ib
≤ 0.005 Ib
Meter on measuring transformer
Ist
≤ 0.005 In
≤ 0.003 In
They must also indicate the range of voltages, frequencies and power factors
within which the meter must satisfy the requirements for maximum
permissible errors in Table 2. These ranges must reflect the typical
characteristics of electricity supplied by public distribution systems.
The voltage and frequency values must fall within the following limits:
0.9 Un ≤ U ≤ 1.1 Un;
0.98 fn ≤ f ≤ 1.02 fn.
For measurements of active energy and active performance, cos φ shall fall
within the range cos φ = 0.5 inductive to cos φ = 0.8 capacitive.
For measurements of reactive energy and reactive performance, sin φ shall
13
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
fall within the range sin φ = 1 to sin φ = 0.5 inductive.
3
3.1
Maximum permissible errors (MPEs)
With U = Un, f = fn, the nominal temperature or, if such a temperature is not
defined, 23°C and without disturbances, the maximum permissible errors in
Table 2 may not be exceeded.
Table 2: MPEs in % under nominal operating conditions, with charging
current and operating temperature defined.
Table 2
sin φ
Limit values in
(inductive or % for meters in
capacitive)
the class
I
directly connected meter
meter on measuring
3
2
1
±4.0
±2.5
transformer
Monophase meter; polyphase meter with balanced loads
0.05 Ib ≤ I ≤ 0.1 Ib
0.1 Ib ≤ I ≤ Imax
0.02 In ≤ I ≤ 0.05 In
0.05 In ≤ I ≤ Imax
1
±3.0
±2.0
0.05 In ≤ I ≤ 0.1 In
0.5
±4.0
±2.5
0.2 Ib ≤ I ≤ Imax
0.1 In ≤ I ≤ Imax
0.5
±3.0
±2.0
0.2 Ib ≤ I ≤ Imax
0.1 In ≤ I ≤ Imax
0.25
±4.0
±2.5
0.1 Ib ≤ I ≤ 0.2 Ib
Polyphase meter functioning with a monophase load
0.1 Ib ≤ I ≤ Imax
0.05 In ≤ I ≤ Imax
1
±4.0
±3.0
0.2 Ib ≤ I ≤ Imax
0.1 In ≤ I ≤ Imax
0.5
±4.0
±3.0
3.2
The meter must not exploit the MPEs or systematically favour any party.
4
Permissible effects of disturbances
4.1
Since the electricity meters are directly connected to the network and the
network current is also one of the measurands, specific environmental
conditions apply to the electricity meters. The meter must satisfy E2
electromagnetic environmental conditions.
4.2
The accuracy of the electricity meter must not be disproportionately altered
by long-duration disturbances.
4.3
Passing disturbances may cause temporary degradation or a loss of function
or power in the meter. After the disturbance the operation and the power of
14
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
the meter must recover and its accuracy must not exceed the limit values.
4.4
Where there are foreseeable high risks of lightning or a predominance of
overhead supply networks, the metrological characteristics of the meter must
be protected.
5
Adequacy
5.1
The meter must not be unduly influenced when the operating voltage differs
from the nominal operating voltage. If the operating voltage is significantly
lower than the nominal operating voltage, the positive error of the meter must
not exceed 10%.
5.2
The total energy display must have a sufficient number of digits that the
indication does not return to its initial value when the meter is operated for
1 500 hours at full load I = Imax, U = Un and cos φ = 1 (to measure active
energy and reactive energy) or sin φ = 1 (to measure active energy or reactive
energy); the meter must not be able to return to zero in use.
5.3
In the event of power failure in the circuit, the amounts of electrical energy
measured must remain available for reading for at least four months.
5.4
No-load operation
If a voltage is applied without any current passing through the circuit, i.e.
while the circuit is open, the meter must not register any energy for any
voltage between 0.8 Un and 1.1 Un .
5.5
Starting the measurement
The meter must start and continue to register at I = Ist, U = Un and cos φ = 1
(to measure active energy or reactive energy) or sin φ = 1 (to measure active
energy or reactive energy). This applies to polyphase meters with balanced
loads.
6
Units
The electrical energy measured must be displayed in kilovar-hours (kVar) or
in megavar-hours (symbol MVAr).
D
Specific requirements for measuring power
1.
Electricity meters may have power measurement functionality for the types
of power for which they also have energy measurement functionality. The
requirements relating to the measurement of energy apply analogously to the
requirements relating to power.
2.
Active electrical power measured must be displayed in Watts (symbol W),
kilowatts (symbol kW) or megawatts (symbol MW). Reactive electrical
15
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
power measured must be displayed in var (symbol var), kilovar (symbol
kVar) or megavar (symbol MVar).
E
Specific requirements relating to generation of the load curve
1
General aspects
An electricity meter with load curve generation functionality is called a
load curve measuring device. Such a meter takes a continuous series of
measurements through uninterrupted measuring periods and registers the
measured values at the end of each measuring period. Electricity meters
may have load curve generation functionality for the types of energy and
power for which they also have energy or power measurement
functionality. The requirements relating to measurement of the
corresponding energy and power apply analogously to generation of the
load curve. The following requirements must also be observed.
2
2.1
Time
Devices measuring the load curve need an internal clock to produce the
measurement period. The length of the measuring period must not diverge
unduly from its reference value.
2.2 The time-stamps appended to the measurement values must show the order in
which the measurements were taken. The electricity meter, insofar as the
device time is adjusted to official time, must have a synchronisation function
enabling the device time to be adjusted a maximum of once per measuring
period. For synchronisation, the device time may be modified by a maximum
of 30 s.
2.3
Adjustment of the device time must be effected metrologically.
Modifications exceeding 30 s are considered adjustments.
2.4
The adjusted value of the measuring period must be checked metrologically.
When the device time is adjusted to official time, the pattern of the
measuring periods must be maintained so that measuring periods are added or
deleted.
2.5
If the device time operates with an external voltage, it must have reserve
capacity throughout which the clock must continue to function without an
external voltage supply. When the device is adjusted to official time, the
electricity meter must recognise whether the duration of an interruption to the
external voltage supply has exceeded the guaranteed reserve capacity. Any
excess must be registered.
2.6
When the device time is adjusted to official time and it deviates excessively,
the measured values for all the measuring periods concerned must be marked
16
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
as incorrect as well as the measured values for periods which were skipped
due to synchronisation or time adjustment of the device. The measured
values for measuring periods during which the device clock was adjusted
must also be marked as incorrect.
3
Display
3.1
The number of load curve values defined must be sufficient to state whether
the MPEs for the measurement of energy and power are respected during a
measuring period. The display must identify the maximum value of the
measurand as given by the operating range and the duration of the measuring
period, without exceeding it.
3.2
It must be possible to choose and display the values measured during the
measuring periods, on which the amount to be paid is based. It must be
possible to choose and display larger counting intervals. Above all, it must be
possible to add up and indicate the measuring periods from the beginning to
the end of the counting period, the intervals repeated during the counting
period, and the values measured above a threshold.
3.3
The sum of all the values of a measurand must give the registry value for the
sums of the same measurand.
3.4
The load curve measuring device must display the device time. If the device
time is based on official time, and if a deviation from official time is
foreseen, generally in whole hours, such as when UTC or CET are used all
year, this discrepancy must be comprehensible to non-specialists or explained
in the instructions for use.
17
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Annex 3
(Art. 8)
Specific requirements for measuring transformers
A
Definitions
Rated current In: current value (primary or secondary) featuring in the
transformer identification data and determining its operating conditions.
Rated voltage Un: current value (primary or secondary) featuring in the
transformer identification data and determining its operating conditions.
Rated power Pn: secondary load value featuring in the transformer
identification data and determining its operating conditions.
Rated frequency fn: frequency value determining the operating
conditions of the transformer.
B
Specific requirements
1
Accuracy classes
1.1
The accuracy classes for current transformers are defined as follow:
0.5
0.5 S
0.2
0.2 S
0.1
The accuracy classes for voltage transformers are defined as follow:
0.5
0.2 S
0.1
1.2
1.3 The manufacturer must mention the corresponding accuracy class. If the
transformer has several windings, the manufacturer must indicate the
accuracy class corresponding to each winding, as well as the one-to-one
correspondence of the windings. Measuring transformers may have
additional windings that do not meet the requirements of this Ordinance, as
long as it is clearly apparent that these additional windings are not intended
to be installed at the input to the electricity meter according to Art. 2, letter
a.
2
18
Operating conditions for current transformers
2.1
The manufacturer must specify the nominal operating conditions for which
the measuring transformer is dimensioned. In particular, the primary and
secondary rated values (In), rated power (Pn), rated frequency (fn) and
accuracy class must be visible or determinable by a single calculation in one
of the four basic operations.
2.2
The manufacturer must indicate the operating conditions within which the
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
2.3
current transformer must comply with the MPEs defined in Ch. 4.
For the primary current, the operating range of Class 0.5, 0.1 and 0.2 current
transformers is defined by a minimum value Imin of maximum 5% In and by
a maximum value Imax of minimum 120% In, which must not however
exceed 6 kA.
For the primary current, the operating range of Class 0.5 S and 0.2 S
current transformers is defined by a minimum value Imin of maximum
1% In and by a maximum value Imax of minimum 120% In, which must
not however exceed 6 kA.
2.4
For the output power, the operating range of current transformers is defined
by a minimum value of maximum 25% Pn or 1 VA, as long as 25% Pn is
below 1 VA, and by a maximum value of minimum 100% Pn.
3
Operating conditions for voltage transformers
3.1
The manufacturer must specify the nominal operating conditions for which
the measuring transformer is dimensioned. In particular, the primary and
secondary rated values (Un), rated power (Pn), rated frequency (fn) and
accuracy class must be visible or determinable by a single calculation made
in one of the four basic mathematical operations.
3.2
The manufacturer must specify the operating conditions within which the
voltage transformer must comply with the maximum permissible errors
defined in Ch. 4.
3.3
For the primary voltage, the operating range of the voltage transformer is
defined by a minimum value Umin of maximum 80% Un and by a maximum
value Umax of minimum 120% Un, which must not however exceed 52 kV.
For the output power, the operating range of the voltage transformer is
defined by a minimum value of maximum 25% Pn and by a maximum value
of at least 100% Pn.
3.4
4
Maximum permissible errors (MPEs)
4.1
Current transformers must comply with the MPEs in Tables 1 and 2
corresponding to their accuracy class.
Table 1
Current range
MPE for the conversion ratio in
%
MPE for the phase change
in minutes
class
0.5 S
Imin ≤ I < 5 % In
±1.5
class
0.2 S
±0.75
0.5 S
±90
0.2 S
±30
19
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
5 % In ≤ I < 20 % In
±0.75
20 % In ≤ I < 100 % In
±0.5
100 % In ≤ I ≤ Imax
±0.5
±0.35
±45
±15
±0.2
±30
±10
±0.2
±30
±10
Table 2
Current range
MPE for the conversion ratio in
MPE for phase change in
%
minutes
Class
Imin ≤ I < 5 % In
5 % In ≤ I < 20 % In
20 % In ≤ I < 100 % In
100 % In ≤ I ≤ Imax
4.2
0.5
±1.5
0.2
Class
0.1
±0.75
0.5
0.2
±90
0.1
±30
±1.5
±0.75
±0.4
±90
±0.75
±0.35
±0.2
±45
±0.5
±0.2
±0.1
±30
Voltage transformers must comply with the MPEs in Table 3 corresponding
to their accuracy class
Table 3
Voltage range
MPE for the conversion ratio
in %
MPE for the phase change in
minutes
class
Umin ≤ U < Umax
class
0.5
0.2
0.1
±0.5
±0.2
±0.1
0.5
±20
0.2
±10
0.1
±5
5
Permissible effect of disturbances
5.1
The accuracy of measuring transformers must not be disproportionately
affected by long-duration disturbances.
5.2
Transient disturbances may cause a temporary degradation, a loss of
function or power. After the disturbance the operation and the power of the
meter must recover and its accuracy must not exceed the limit values.
6
Adequacy
Measuring transformers must be designed in such a way that they can be
installed at the input of an electricity meter which meets the
20
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
requirements of this Ordinance and which has been legally placed on the
market or which is imminently due to be.
7
7.1
Identification
All the data necessary for identification and characterisation of the
measuring transformer must feature on the transformer indelibly,
unambiguously and irremovably.
7.2
Measurement values must be given in SI units.
7.3
The connection terminals of transformers must be indicated permanently
and individually.
21
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
Annex 4
(Art. 6, subpara. 4)
Statistical control procedure for electricity meters
1
Batches of meters
1.1
A batch of meters consists of a number of meters grouped together for
statistical control. The meters selected from a batch to be checked at
random are collectively called the sample.
A batch of meters may only contain meters of the same model, in the same
accuracy class, the same operating range, the same functionality and the
same configuration from a maximum of two consecutive production years.
1.2
1.3
Combinations of different meters and pricing modules are not permitted
within the same batch. Within a batch, only differences of minor
importance between models are permitted, which do not affect the
characteristic properties of the sample results.
1.4
A batch may not exceed 5 000 meters. Meters from two consecutive
production years are only permitted in the same batch when no more than
1 000 meters in the batch were manufactured in one of the two years.
1.5
A batch may contain meters belonging to a number of users. All users coowning a batch are concerned by the results of sample checks and any
other measures taken. The commitments referred to in Ch. 3.6 may be
honoured with the consent of all users.
METAS issues directives establishing administrative procedures
particularly concerning the declaration, identification, management and
modification of batches, as well as the organisation of checks and
announcement of the results of the checks.
1.6
22
2
Sampling procedure
2.1
Sample checks shall be conducted every five years. The first check shall
take place five years after the production year of the majority of the meters.
The final deadline for declaring new meters for sample checks shall be 30
June of the fourth year following the manufacture of the majority of the
meters.
2.2
The samples shall be selected by the implementing body on the basis of
batch lists submitted to METAS during the second half of the year
preceding the sample check. This selection must be made according to a
procedure approved by METAS. Two samples shall be selected from 46
electricity meters, of which 6 are reserve meters which may only be
verified in the exceptional cases defined in Ch. 4.2 and 4.3.
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
2.3
2.4
2.5
The user must make the meters in the first randomly selected sample
available within a maximum of two months of notification of the random
selection of meters for the check. The second sample must, as far as is
necessary under Ch. 3.4, be made available within a maximum of two
months following notification of the results of the check on the first
sample.
The sampling procedure must take place according to a sampling plan
indicating "met – not met"; it shall include a maximum of two samples
each comprising 40 electricity meters.
METAS may order or approve other procedures that are at least statistically
equivalent.
3
Requirements applicable to the samples
3.1
A meter that does not meet the requirements set out in Annex 1 or 2 shall
be deemed not to conform to the requirements. METAS shall decide which
minimum aspects must be checked.
3.2
Initially, the 40 meters in the first sample must be checked. The
requirements are considered fulfilled if a maximum of one meter fails to
comply with the MPEs set out in Ch. 3.1, subject to the rules defined in Ch.
3.5.
If more than four meters from the first sample do not comply with the
MPEs set out in Ch. 3.1, all the meters in the batch must be withdrawn in
accordance with Ch. 5.2.
3.3
3.4
Where more than one meter from the first sample does not meet the
requirements, the second sample must also be checked. When more than
four meters from the two samples do not meet the requirements defined in
Ch. 3.1, all the meters in the batch must be withdrawn from circulation in
accordance with Ch. 5.2.
3.5
METAS may order additional checks if deviations are observed from the
normal behaviour of the meters, or if there is reason to believe that, for
certain types, years of manufacture or batches, the meters in the sample are
not representative of all the meters in service from the batch in question.
METAS may exclude certain types, years of manufacture or batches from
the statistical control procedure.
The checks may be omitted if the user undertakes to withdraw from
circulation all the meters in the batch in question, in accordance with Ch.
5.2., within the established time frame for the provision of meters, in
accordance with Ch. 2.3.
3.6
4
Execution of the sample check
4.1
Sample checks of the security-sealed meters must take place at METAS or
in a verification laboratory authorised by METAS.
4.2
Meters with clear signs of deterioration need not be checked. They must
23
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
however be reported to METAS, including mention of the nature of the
deterioration. METAS may authorise the use of reserve meters.
4.3
Only deterioration such as fire or water damage, permanent electronic
failure or defects in the meter, easily detectable by a lay person without
prior knowledge of the instructions for use, shall be considered to
constitute obvious deterioration detectable by lay persons without
auxiliary means and without dismantling.
Unfindable or irremovable meters must be reported to METAS, including
mention of the meter installer's address.
METAS may establish, for a specific case, how such a meter is counted
in the evaluation defined in Ch. 3.2 to 3.5. It may authorise the use of
reserve meters.
4.4
4.5
4.6
A batch meeting the statistical requirements shall be released by METAS.
The meters in the sample may only be modified after their release. Only the
meters in the sample that meet the requirements may be used.
4.7
Meters in existing batches may only be serviced on the basis of a
programme approved by METAS.
5
Validity of the verification
5.1
When the sample meets the requirements defined in Chapters 3.2 to 3.5, the
meters in the batch in question are considered verified for the next five
years, as long as they remain subject to statistical control.
When the samples do not meet the requirements or when the checks
referred to in Ch. 3.6 are omitted, all the meters in the batch must be
decommissioned by the end of the year following the audit.
The reuse of meters withdrawn from circulation implies their maintenance
and verification according to Annex 7, Ch. 1, of the Ordinance on
Measuring Instruments.
For meters complying with the requirements which must nevertheless be
replaced by others in accordance with Chapters 3.2 to 3.5, or whose batches
have been deleted, METAS may decide on the basis of a proposal that the
5.2
5.3
5.4
24
Checks must be completed at the latest by the end of October of the year of
the check. As soon as the sample has been checked, the verification
laboratories shall forward the results of the check to METAS.
Within two months of receiving the measuring reports, METAS shall
decide on the subsequent course of action. Until the written release of the
batch by METAS, all operations on the sample meters are prohibited.
During this period, the meters shall remain at the disposal of METAS, who
may conduct other investigations, either in the verification laboratory or in
its own laboratories.
FDJP Ordinance on Electrical Energy and Power Measuring Instruments RO 2014
meters may be considered verified for a maximum of five years. These
meters may therefore no longer be accepted for the statistical procedure.
6
Inspection fees and handover to METAS
Inspection fees payable to laboratories involved in the statistical control
procedure as well as the handover to METAS shall be received in
accordance with the Ordinance of 23 November 2005 on verification
fees3.
3
SR 941.298.1
25