The document describes the Firmware and Hardware
Provisions in ABT meter required standards
IS 14697 AC Static Watthour Meters Class 1 and 2 - Specification
IS 15959 Indian DLMS standard
CBIP-88
Specification for AC Static Electrical Energy Meters
CBIP technical
report No. 304.
Specification for AC Static Electrical Energy Meters. With latest
amendments
IS 15707 Testing, Evaluation, Installation and Maintenance of AC Electricity
Meters- Code of Practice
IS 12063
IS 12346 Specification for testing equipments for ac energy Meters
IS 9000 Basic Environmental Testing Procedures for Electronic & Electrical
items.
DIN 43859 Watthour meters for instrument-transformer connection; main
dimensions for three-phase meters
IEC 61000-4-3 Electromagnetic compatibility (EMC) - Testing and measurement
techniques -Radiated, radio-frequency, electromagnetic field
immunity test
IEC 61000-4-5 Electromagnetic compatibility (EMC) - Testing and measurement
techniques Surge immunity test
IEC 62052-11
Electricity metering equipment (AC)
General requirements, tests, and test conditions
IEC 62053-22
Electricity metering equipment (AC)
Static meters for active energy class 0.2 and 0.5)
IEC 62053-23
Electricity metering equipment (AC)
Static meters for reactive energy class 2 and 3)
IEC 60529 Degrees of protection provided
by enclosures (IP Code)
HW Provisions
The PCB of the meter is designed to meet the below specifications.
Basic requirements
Meter standards
The ABT meter fulfills the following meter standards:
IS14697
CBIP-304
IEC62052-11 General requirements for electricity meters
IEC62053-22 electricity meters for active energy (class 0.2s and 0.5s)
Nominal voltages
63.5V -40% +20%
110 -40% -40% +20%
.
Nominal current
The ABT meter offers the following current range:
1(2)A or 5(10)A
Nominal frequency
The ABT works with the following frequencies:
50 Hz, +/- 5%
Measurement possibilities
It measures the following quantities:
Active energy, kWh
Reactive energy, kVARh
Apparent energy, kVAh
Current, voltage, active power, reactive power, apparent power, power factor, power
factor angle, Voltage angle on all Phases and system.
Phase to Phase Voltage
Frequency.
%THD for Voltage And Current
LCD
The LCD of the meter has the following features:
Number of digits for identifier 7 digits
The digit size for identifier Min.5x3 mm
Number of digits for energy data 8 digits
The digit size main digit 10x5 mm
Inter digit gap 1mm
Side gap 2mm
LCD will be having backlit. The LCD is of STN type construction suitable for temperature 80
Deg.C storage and 65 Deg.C operation. The LCD has a wide viewing angle of 45 deg to 60 deg
cone, up to one meter distance.
Life time:100k hours
Temp range Operating: -30 to 80 deg C
Temp range Storage: -40 to 80 deg C
Apart from Provision for display of Identifiers and main digits, the LCD also has provision for
display of the follows:
1) The quadrant of operation
2) The presence of phase Voltage
3) Indicator for Current reversal
4) Top cover opening indication.
5) Magnetic tamper indication
Display Modes
The meter has 3 display modes.
1) Normal
2) Alternate
3) High Resolution Mode
Normal Mode: In the normal mode the display parameters will scroll. The display hold time will
be programmable. There will be an indication to indicate the communication is on.
Alternate Mode: The pressing of a button will start or stop this mode. The display will scroll the
parameters in up or down direction based on the pressing of a button. There will be an
indication to indicate the communication is on.
High Resolution Mode: The pressing of a button will start or stop this mode. The display will
scroll the parameters in up or down direction based on the pressing of a button. There will be an
indication to indicate the communication is on. The meter will display the energy parameters
with 2 integers and 4 decimals.
Normal Display Resolution:
1. Voltage = 0.01V
2. Current = 0.001A
3. PF = 0.01
4. Active Energy = 0.001kWh
5. Apparent Energy = 0.001kVAh
6. Reactive Energy = 0.001kVARh
7. Demand = 0.001kVA/kW
Enclosure
The ABT meter offers the following features:
Unbreakable, high grade, flame retardant polycarbonate with thickness more than
2.0 mm, and of good dielectric and mechanical strength. The material of meter base
& terminal block shall be glass reinforced
The detachable terminal block shall be moulded type made of non-hygroscopic, flame retardant
material having good dielectric and mechanical strength. The molded terminal block shall be
made from 10- 20% glass filled polycarbonate material conforming to FH-1 of IS 11731 (Part-I)
having adequate insulating properties and mechanical strength with brass inserts for connecting
terminals. The terminal block satisfy all the conditions specified in IEC-62052 & IS-14697. The
Terminal block shall form an extension of the meter case and shall have terminal holes and
shall be of sufficient size to accommodate the insulated conductors & meeting the requirement
of IS 13779 :1993/CBIP technical report- 88.
The polycarbonate parts fulfill the requirement of following tests:
Sr.No. Test 10% Glass filled
non-transparent
material for meter
base & terminal
block
Transparent
material for meter
cover & terminal
cover
1 UV ageing for 200 Hrs. as per
ASTM:G53 (Cl. No. 9.3)
4 Hours UV at 60C,
4 Hours
condensation at 50C
4 Hours UV at 60C,
4 Hours
condensation at 50C
2 Boiling water test (10 Min) No softening &
whitening & No
change in colour,
shape, size &
dimensions
No softening &
whitening & No
change in colour,
shape, size &
dimensions
3 Ball pressure test as per IEC-60695-
10-2
125 C +/- 2C 125 C +/- 2C
4 Flammability Test
(a) As per UL 94 or
(b) As per IS 11731 (Part-2) 1986
VO
FVO
VO
FVO
5 Glow wire test
IS:11000(part 2/ SEC-1) 1984 OR IEC
60695-2-12
960 C 850 C
6 Heat deflection Temp.(HDT)
HDT/Ae, 1.8MPa edge(100mm) As per
ISO 75/Ae
132 C 125 C
Terminal cover
Extended Terminal Block Cover
Short Terminal Block Cover
The fixing screw(s) used on the ETBC for fixing and sealing of extended terminal
cover shall be held captive on the terminal cover.
Extended terminal block cover shall be provided to ensure that the internal parts are
not accessible for tampering etc. without breaking the seals. The ETBC shall be
extended by about 30 mm 5 mm below the terminal block. A firm connection shall
be established with in the meter case to energies the voltage circuit.
To facilitate sealing, a raised support arrangement with minimum 2 mm hole nearby
sealing screws, which shall constitute an integral part of the terminal cover or a slot
type arrangement underneath/alongside the sealing screw shall be provided.
The meter shall have minimum three fixing holes, one at the top and other two inside
the terminal block. The top hole shall be key-hole type on the back of the meter base
so that the hanging-screw is not accessible after fixing of the meter and it shall not
be possible to remove the meter from the hanging-screw without removing the
terminal cover and screw(s) from the terminal block. The lower fixing holes shall be
provided under the extended terminal cover.
Top cover assembly- transparent.
Support of top cover removal detection
Push button
Optical interface
Optical Port seal
The main cover be ultrasonically welded to the base
Protection class: IP 54
Communication in form of RS232 /RS485 on main PCB,
Ethernet port
USB
Internal GSM/GPRS Modem
Name plate and Marking
The meter shall have a nameplate clearly visible, effectively secured against removal and
indelible. It be distinctly marked with all essential details as per IS14697/IEC 62052-11-2003
standard. The meter Serial No. shall be Bar Coded along with Numeric No. The nameplate
marking not fade or otherwise be adversely affected by UV exposure with lapse of time.
Top cover removal detection
The Top cover Opening is detected and logged as an event. It operates without obstruction
while opening or closing the Enclosure.
Magnetic field Test
The meter withstands all the tests for external AC/DC magnetic field as per CBIP-88. Moreover,
the magnetic influence test for permanent magnet of 0.5 Tesla for a minimum period of 15
minutes on the meter body. If the accuracy of the meter gets affected during the test, then the
same shall be recorded as magnetic tamper event with date and time stamping and the meter
shall record energy considering maximum value current (Imax) and reference voltage at unity
power factor. After removal of the magnet the meter behave normally and meet the accuracy as
per IS14697.
The meter accuracy shall not be affected by AC/DC magnetic field of 0.2T on all the sides of
meter i.e. front, sides, top and bottom of the meter as per CBIP-88 Technical Report. Moreover
meter working shall not be affected by permanent magnet of 0.5 T of minimum size 70 x70 x 50
mm.
There is a provision to select whether the meter add the Imax Energy to the billing kWh
readings or store in a separate. Imax recording
RTC backup
The time keeping during a power outage is realized with an internal battery.
Optional HW requirements
The ABT hardware also optionally offer the following features:
Relay card 2 /4 / 6/ relays
LPR (Low Power Radio)
Firmware Provisions
The Firmware provisions are:
Active energy measurement in both Import and Export direction (kWh Import, kWh
Export). Active energy recording on fundamental frequency as well as total
(Fundamental +Harmonics)
Reactive energy measurement in all four quadrants (kVARhQ1, kVARhQ2,
kVARhQ3 and kVARhQ4)
Apparent energy measurement (kVAh Import, kVAh Export)
TOU application
8 tariffs,
It be possible to switch the rates at predefined time during the day.
Upto 4 seasons
Up to 12 historical data
The historical data get logged at a predefined date and a predefined time
120 days of midnight 8 energy + 5 ABT parameters or 8 energy + 8 ABT parameters.
Demand measurement for any 4 parameters to be programmable from the below:
kW Import
kW Export
kVA Import
kVA Export
kVAR Import
kVAR Export
kVAR Q1
kVAR Q2
kVAR Q3
kVAR Q4
Support of optical port
Support of remote port
500 No of events
Events to be stored in buckets
All Voltage events
All Current events
Event Type
R phase Low phase current (Creep)
Y phase Low phase current (Creep)
B phase Low phase current (Creep)
Any phase High Voltage
R phase Low Voltage
Y phase Low Voltage
B phase Low Voltage
R phase Current Reversal
Y phase Current Reversal
B phase Current Reversal
Current Unbalance
Voltage Unbalance
Power outage & power up
Optical MD Reset
Warm start
Communication Protocol :
IEC 62056-21 Mode C
DLMS as per ICS
It shall be possible to communicate on the Optical and Remote port using
IEC 62056-21 Mode C or DLMS protocol.
It be possible to program the Remote port to send a preprogrammed
parameter data on the Remote port at a regular interval of 1 seconds.
Modbus
It be possible to program the remote port for Modbus protocol
Load profile data of energy/demand of every 15 minutes interval 8 energy for 120
days ABT.
Per phase Voltage and Current profile data of averaged over every 15 minutes
interval of 120 days be stored in the meter memory
Average Frequency profile of every 15 minute interval of 120 days be stored in the
meter memory.
The energy/demand profile channels be selectable from :
kWh Import
kWh Export
kVARh Import
kVARh Export
kVARh Q1
kVARh Q2
kVARh Q3
kVARh Q4
kVAh Import
kVAh Export
Net kWh
Net kVARh Hi
Net kVARh Low.
The reactive energy shall be recorded for each metering interval in four different
registers as kVARh Q1, kVARh Q2, kVARh Q3, kVARh Q4.
Two separate registers shall be provided to record kVARH when system voltage
is >103% and when system voltage is < 97%.
The meter shall compute the net kWh and kVARh during each successive 15-minute
block metering interval along with a plus/minus sign. These values will be displayed and
stored in the load profile.
Additional Points:
Immunity to 35 KV with logging
10 KV impulse with 12 Ohm resistance
Provisition for flush mounting with automatic CT Shorting facility, auxillary power supply
(AC/DC)
Reading during power off mode : Internal or external battery with induction coupling. For display
as well as data downloading.
CT/PT compensation in ABT meter
ABT time sync facility.
Demand reset count for manual as well as auto reset count separetly.
Phase sequence on display.
Energy units programmable wh,kwh anf Mwh.
