2.1.1 ACTIVE ENERGY
The meter measures, registers and displays active energy within the rated accuracy class. Meter measures total active energy (register labels 15.8.x in accordance with SRPS EN 62056‐
61 (OBIS)).
Presentation of these values on the display is programmable, as already described under point 1.1.10.
2.1.2 MAXIMUM POWER
The meter measures, registers and displays maximum mean active power under all tariffs and (register mark 1.6.x in accordance with SRPS EN 62056‐61 (OBIS)). Power integration period is initially 15 minutes. This value is programmable and display of this value is easily accessible in manual display operating mode and remotely. Manual maxigraph reset is not possible.
2.1.3 INSTANEOUS ACTIVE POWER
The meter measures and displays on request current active power on LC display.
2.1.4 LOAD PROFILES OF METERED AND REGISTERED VALUES
Meter shall have the possibility to record at least 2 profiles of metering or registered values. Each profile should support the recording of at least 6 selected values (channels). Sampling period inside each profile can be independently set.
Change of all recording and registering parameters of metering and registered values may be done locally (via optical port) and remotely (via external communication).
Initially, meter records the following profiles: load profile and profile of daily values of register. Optionally, meter records the profiles of hourly measures and metering values.
2.1.4.1 LOAD PROFILE
Meter records and registers the load profile (mean active power value). Integration period is initially 15 minutes. Corresponding time stamp is recorded in the load profile with corresponding block of registered active power value.
Total capacity for load profile storage shall enable memorising of at least 4320 power metering records.
2.1.4.2 PROFILE OF HOURLY REGISTER VALUES
Meter records and registers values of all accounting registers each 60 minutes. Hourly value recording and registering time is initially at the full hour.
In addition to hourly values of registers, meter records and registers meter statuses.
Corresponding time stamp is recorded in the meter in the profile of hourly register values with the corresponding block of registers.
Memory for the storage of profiles of hourly values of meter registers and statuses has the capacity of at least 24 entries, under FIFO principle.
Meter records and registers the values of all accounting registers at the pre‐set time. Initially this is at 00 hrs, but this parameter is programmable.
In addition to daily register values, the meter records and registers meter statuses.
Corresponding time stamp is recorded in the meter in the profile of daily register values with the corresponding block of registers.
Memory for the storage of profiles of daily values of meter registers and statuses has the capacity of at least 7 records, under FIFO principle.
2.1.4.4 PROFILE OF METERING VALUES
This profile is initially used for recording and registering of the voltage value at the meter inlet. Corresponding time stamp is recorded in the profile of metering values with the corresponding block of registers.
Total memory capacity for saving of profiles of metering values shall enable memorising of at least 500 sets of metering values.
This profile may be used for recording and registering of other metering values (e.g. values of current through the meter).
2.1.5 EVENT LOG
Meter memorises events related to metering, adjustment and handling into the special memory registers (organised under FIFO principle). A record in the memory is generated for each event memorising the type of event, time stamp and meter status when the event occurred.
Each of those memory registers is separate Event log for the type of event (events related to the electricity quality, metering integrity, consumption management etc.) It is possible to integrate events into one unique Event Log.
Meter registers at least 200 events.
Event coding as well as the type of events entered in the Event Log should be organised under the recommendations given in IDIS or equivalent specification.
Event Log is not erasable via any external intervention.
2.1.6 VOLTAGE METERING
Meter measures and displays effective voltage value on request.
2.1.7 CURRENT METERING
Meter measures and displays effective current value on request.
2.1.8 PHASE PRESENCE
Meter displays phase voltage presence on the connected conductors. Phase display function provides information on certain phase presence. As a rule, voltage drop below the value of 50% of rated voltage is valued as the absence of corresponding phase voltage. This value is programmable, and it is initially 50%.
2.1.10 TIME AND DATE
2.1.9 INTERNAL CLOCK
Accuracy and other features of internal clock shall be realised in accordance with SRPS EN
62052‐21 and SRPS EN 62054‐21 standards. Setting and adjustment of time and other internal clock features shall be realised in the same manner as in the case of energy value parameterisation and via the same communication ports.
Internal clock supply shall be realised as basic and stand‐by. Basic supply comes from the power grid.
Stand‐by supply provides data storing of real time. Meter possesses real time calendar.
2.1.11 STANDBY SUPPLY
Stand‐by supply of internal clock shall be realised via battery or super capacitor, where the super capacitor provides data storing for minimum 7 days.
Battery operating life is minimum 10 years.
If battery operating life is shorter than the seal validity period of the Measures and Precious Metals Directorate, battery change has to be realized in such a way not to require removal of the Measures and Precious Metals Directorate seal. In this case battery access shall be protected by a special seal (electricity distributor seal).
Battery change shall be realised without the loss of meter data during the time anticipated for battery change.
In addition to internal clock, battery/ supercapacitor may supply a corresponding part of meter memory: e.g. part of the memory for the storage of communication parameters, etc., but not master or accounting data.
Battery state testing function shall be realised inside the meter (under self‐check regime of meter operation). If irregular battery state is detected (failure, if the battery is empty or if it does not exist), the function of clear display of irregular state is realized and (preferably) entered into Event Log.
2.1.12 DAYLIGHT SAVING TIME – DST
Meter shall possess automatic daylight saving time function (Daylight saving time – DST) and according to the calendar of Central European Time – CET.
2.1.13 CURRENT TARIFF
Meter shall have continuous display of current active tariff register, regardless of its display mode.
2.1.14 LOCAL TARIFF REGISTER MANAGEMENT
Local tariff register management shall be realised via internal clock.
Tariff programme shall anticipate the possibility of defining four different seasons, at least five different days within the season and two different days for holidays.
Tariffs may be changed during one day for at least eight times.
2.1.15 EXTERNAL TARIFF REGISTER MANAGEMENT
External tariff register management is executed by means of two clamps for control voltage 230 V connection and it has priority over local tariff register management.
2.1.16 METERING INTEGRITY
Meters shall have metering integrity violation (terminal cover opening, meter housing opening, parameter change, strong magnetic field impact on the meter, etc.) recording and signalling function.
It is desirable that meters memorise accounting registers state during each metering integrity violation.
For each of the indicated events, Event Log shall make a record with a time stamp when this event occurred.
2.1.16.1 DETECTION OF STRONG MAGNETIC FIELD
Meter shall have realised strong magnetic field detection function which can influence its regular operation.
Upon detecting magnetic field that can influence its regular operation, time and date of detection of magnetic field is recorded in the Event Log.
This function shall be realised upon the request of electricity distributor.
2.1.17 DATA STABILITY AND MEMORISING
Master data about the meter (year of manufacture, type label and serial number) shall not be changeable. In addition to this, electricity data as well as data on maximum 15‐minute power shall not be changeable. These data are located in the part of permanent meter memory and their integrity is not dependent on period when meter was not supplied (basic and stand‐by). All other data may be, via communication module (communicator) and IR port, altered according to the current tariff system and upon the order of authorised persons.
Meter shall record and register (memorise) states of all tariff registers during the accounting period (first and last day of the month) and at an exactly defined moment (programmable locally or remotely).
Event Log shall record each data change occurring on the meter.
2.1.18 COUNTDOWN
Meter shall have the reduction blockade of achieved individual register values.
2.1.19 DATA STORAGE PERIOD
Accounting data (active electricity and maximum mean power with date and time of achievement, registered according to tariffs) shall be stored for at least 12 last accounting periods (usually 12 months). After the new cycle starts, space shall be provided for the new memory block, with the deletion of the last (the oldest) in the sequence of registers.
Total registered electricity cannot be deleted.
2.2 ADDITIONAL FUNCTIONS
2.2.1 COMMUNICATION WITH THE METER
Meter shall have communication between the meter and different devices (hand terminals, communication modules, registers, data concentrators, etc.). Communication shall be
executed via interfaces given in the following table, with the usage of data model, application layer and identification structure according to DLMS/COSEM.
Block diagram of meter interfaces. Meter shall have the following interfaces:
Type Type Physical characteristics of
interface
Communication
protocol
Optical interface: IR port SRPS EN 62056‐21 DLMS/COSEM
Electrical interface № 1 RS‐485 RS‐485 DLMS/COSEM
*Optionally (subject to additional request of electricity distributor)
Electrical interface № 2 M‐BUS EN 13757‐2 EN 13575‐3
Electrical interface № 3
RS‐232 RS‐232 EN 13575‐4
or
Ethernet RJ‐45 Ethernet TCP/IP (DHCP)
*bidder can offer interfaces no.2 and 3, but he is not obliged
Meter shall have DLMS/COSEM certificate issued based on the verification with the latest version of testing software (at least version 2).