Download 1. Appointment and sphere of application

THREE-PHASE MULTI-TARIFF ELECTRICTY METER
СТЭМ-3А
TECHNICAL CERTIFICATE
CONTENT
1. Appointment and sphere of application__________________________________
2. Technical specifications _____________________________________________
3. Device and principle of operation ______________________________________
4. Interfaces and record of load profile______________________________
5. Self-Diagnostics __________________________________________________
6. Software __________________________________________________ ______
7. Overall and mounting dimensions ____________________________________
8. Wiring diagram _______________________________________________
9. The procedure of preparation and installation ___________________________
10. Calibration ______________________________________________________
11. Safety requirements _________________________________________________
12. Sales Package_____________________________________________________
13. Package _________________________________________________________
14. Trasnsportation ___________________________________________________
15. Storage _________________________________________________________
16. Manufacturer's warranty ___________________________________________
17. Certificate of acceptance __________________________________________ _
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1. Appointment and sphere of application
Three-phase multi-tariff electricity meter СТЭМ-3А (Three-phase Multi-function
Electricity Meter TMEM-3A) is a multi-function, programmable electricity meter of direct
switching with a microprocessor, which is dedicated for accounting active energy of AC with
frequency of 50Hz, as well as to work as part of an Automated Energy Control and Metering
System.
Electricity meter is designed for use in enclosed spaces.
Requirements for meter accuracy and accuracy testing correspond to GOST 30206-94
standards, and other requirements (definition, technical and etc.) to GOST 52320-2005
standards. Safety degree of exploitation of this electricity meter corresponds to the 2nd class of
protection by GOST 26104 standards, and the degree of protection by IP51 scale, coded in
accordance with GOST 14254.
2. Technical specifications
2.1. Nominal Voltage, V
2.2. Nominal current, A
2.3. Max. current, A
2.4. Nominal frequency, Hz
2.5. The gear ratio, imp / kWh
2.6. Storing data in the absence of main power,
not less than, years
2.7. The sensitivity threshold, not more than, W
2.8. The number of tariffs, up to
2.9. The number of tariff zones, up to
2.9. Accuracy class
2.10. The data transfer speed, bps
2.11. Self-propelled meter
2.12. Power consumption, not more than, V*A
2.13. Self-control, a / d
2.14. The level of information security
2.15. Temperature operating range, C
2.16. Relative humidity, at 25 C, %
2.17. The atmospheric pressure, kPa (mmHg.)
2.18. Weight, not more than, kg
2.19 Overall dimensions, mm
2.20. Calibration interval, years
2.21. Warranty period, years
2.22 Service lifetime, years
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3х220х280
5
10/50/80
50±5%
10000
6
1.25
4
24
0.2S, 0.5S
9600
no
5
1
3
-20+55
90
70-106,7 (537-800)
1
280х173х70
5
3
25
3. Device and principle of operation
3.1. Main units
The meter consists of a case, an electronic unit and terminal.
3.1.1. Case
The case of electricity meter correspond to requirements of GOST 30207-94 standards.
On the front side of the case are liquid crystal display (LCD), LED interface and scoreboard
with appropriate information in accordance with GOST 25372 standards.
LCD, LED and name plate installed behind high-strength window, which is sealed from
inside by the manufacturer.
On the bottom on the case fixed an e-node and terminal, through which the electricity
meter is connected to the electrical, data and calibration circuits. Terminal closes with a
separate cover, which can be sealed.
The case cover being sealed by the manufacturer and the National Standards Body, and
the terminal cover by the parties concerned (electricity network, power control, etc.).
3.1.2. Electronic unit
The electronic unit consists of microprocessor and LCD boards.
On the microprocessor board are located power supply capacitor, electronic button, manual
button of operation behind the front cover of the electricity meter, specialized super-power
(VLSI) integrated circuit, 8-bit microcontroller for data processing and logging, electrically
reprogrammable ROM (EEPROM) for storage of load profile, configuration data and auxiliary
constants, EEPROM reset scheme, shunt resistor, resistive voltage divider, quartz generator
and powerful lithium battery. On the LCD board are located LCD and LED..
3.2. Principle of operation
Information about the measurable values of voltage and current through a voltage
divider and shunt resistor arrives at the VLSI, where is the analog-to-digital conversion. After
that, the recieved digital information is programmed in the microprocessor, which determines
the current tariff, provides and coordinates the work EEPROM, LCD and interfaces.
The electronic unit is mainly powered from electrical network, using a capacitor power
supply. During the periods of the main power absence the built-in lithium battery provides the
operation of internal electronic clock, and the non-volatile memory provides the data storage,
including information about the software presets during the operation of the meter.
LCD displays the necessary information. Data on the LCD display has two modes - automatic
and manual. Amount of displayed information and its sequence determined by the software.
3.3. Block diagram of the electricity meter
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ROM (EEPROM)
I1, I2, I3
Current
transformator
crystals
Ib
VLSI
U1,
Ic U2, U3
Resistive
measurement
Microcontro
ller
Interfaces
divider
LCD
Power
Lit.
Supply
Battery
3.4. Protection of electricity meter and data security
In order to protect electricity meter from unauthorized access to their operation we
implemented design, software and technical solutions that provide the protection of eclectricity
meters and data.
•
In addition, that each electricity meter has individual password used for communication
with external devices (portable device PRO UNIT or PC) the programs also have passwords.




The meter records the opening of the cover (authorized and unauthorized) and the last date
of opening.
Case design and used materials do not allow unauthorized access without dealing
mechanical damage to the case or disrupting seals.
Provided the data storage in case of main power absence, as well as in case of lithium
battery replacement.
Electricity meter records the date of turning on/off phases and zero, interruption and restore
of main power.
3.5. Display of information
Display of the required information is on the LCD, which consists of 8-digit digital segments
and additional inscriptions. Using the digital segment, additional inscriptions and the ability of
programmable periodic indication of each information from 1 to 127 seconds, the LCD
indicates the information with the following sequence and configuration:
The table shows a diagram of the LCD display of three-phase meter and description of the parameters.
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Параметр
Left side
Center
Date
12.03.2005
Time
12:12:12
Total
Active Total energy
888888.88
T1
Active Tariff 1
888888.88
T2
Active Tariff 2
888888.88
T3
Active Tariff 3
888888.88
T4
Active Tariff 4
888888.88
Active Total Power
P 88.888
Cos
CosA, Active PowerA
0.00 8.888
Cos
CosB, Active PowerB
0.00 8.888
Cos
CosC, Active PowerC
0.00 8.888
Total
Reactive Total energy
888888.88
T1
Reactive Tariff 1
888888.88
T2
Reactive Tariff 2
888888.88
T3
Reactive Tariff 3
888888.88
T4
Reactive Tariff 4
888888.88
Reactive Total Power
P 88.888
Cos
SinA, Reactive Power A
0.00 8.888
Cos
SinB, Reactive Power B
0.00 8.888
Cos
SinC, Reactive Power C
0.00 8.888
Total Power
P 88.888
Total Power A
8.888
Total Power B
8.888
Total Power C
8.888
Angle AB
888.8 o
Angle BC
888.8 o
Angle AC
888.8 o
VoltageA, CurrentA
0.00A 888
VoltageB, CurrentB
0.00A 888
VoltageC, CurrentC
0.00A 888
Frequency
F 88.88
Note: 1. Underlined characters are flashing
Right side
KW h
KW h
KW h
KW h
KW h
KW h
kW

kW 
kW 
kVarh
kVarh
kVarh
kVarh
kVarh
kVar
kVar 
kVar 
kVar 
VA
VA

VA

VA




V

V

V

Hz
Description
Дата
Время
Всего по всем тарифам (активная)
Всего по первому тарифу (активная)
Всего по второму тарифу (активная)
Всего по третьему тарифу (активная)
Всего по четвертому тарифу (активная)
Общая активная мощность
Косинус фи и мощность фазы А
Косинус фи и мощность фазы В
Косинус фи и мощность фазы С
Всего по всем тарифам (реактивная)
Всего по первому тарифу (реактивная)
Всего по второму тарифу (реактивная)
Всего по третьему тарифу (реактивная)
Всего по четвертому тарифу (реактивная)
Общая реактивная мощность
Синус фи и мощность фазы А
Синус фи и мощность фазы В
Синус фи и мощность фазы С
Общая полная мощность
Полная мощность фазы А
Полная мощность фазы В
Полная мощность фазы С
Угол между фазами А и В (в градусах)
Угол между фазами В и С (в градусах)
Угол между фазами А и С (в градусах)
Ток и напряжение фазы А (ампер, вольт)
Ток и напряжение фазы B (ампер, вольт)
Ток и напряжение фазы C (ампер, вольт)
Частота сети
2.  means the phase "A", etc.
3.5.3. In addition to the information listed in paragraph 3.5.2., the following information is also
displayed on the LCD:
 Information about the need to replace the lithium battery is displayed on the left side of
the digital segments with inscription com, which flashes at a frequency of 1 Hz.
 Information about error found during self-diagnostics, is displayed on the right side of
the digital segments with inscription Error, which flashes at a frequency of 1 Hz.
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
Information about the current tariff is displayed at the bottom of the digital segments
during the whole period of validity of the tariff with inscription (T1, T2, etc.), which
flashes at 1 Hz.
 Opening of the case cover (authorized and unauthorized) causes flashing of all digital
segments and additional inscriptions on LCD with a frequency of 1 Hz.
3.5.4. Duration of displaying data on LCD, the number of tariffs and the time of their
action are programmed according to customer requirements.
4. Interfaces and load profile record
4.1. Interfaces
Depending on the modification electricity meter can have different interfaces (Data
exchange).
4.1.1. Digital serial interface
The digital serial interface that is used in the meter could be of type "Current Loop" or
optocoupler.
4.1.2. Optical interface
The appointment of interface is to provide data exchange with the meter. For the
connection is used portable device PRO UNIT (with the corresponding optical sensor) or PC
with special software.
4.1.2. Interfaces of control of the electricity meter
For electricity meter calibration is used telemetry interface.
4.2. Record Of the load curve
The load curve record is carried out in specially allocated memory 300 and allows to record the
daily load curve with 30-minute intervals. Reading the load curve is carried out by external
devices (portable device PRO UNIT or PC) using a software package SEMNET.
5. Self-Diagnostics of the meter
5.1. Electricity meter is equipped with self-diagnostics system, which is activated and works
once a day, as well as every time when the meter is switched in electrical network. During the
self-diagnostics are tested all the main sectors: microcontroller, EEPROM, LCD, etc. If the
meter detects a condition that affects its normal functioning, then the LCD displays message
about error.
5.2. During the self-diagnostics the battery level is also checked. Information about the need to
replace the lithium battery is displayed a month before full battery depletion. Battery
replacement during this period of time will provide uninterrupted work of the meter.
Lifetime of lithium battery is 10 years.
5.3. Self-diagnostic results are recorded in the meter and can be read by external devices, via
appropriate interface.
5.4. The information about the condition that affects normal functioning of the meter will stay
on the LCD until the removal of cause of error.
6. Software
6.1. The measurement process is a continuous measurement of signals received from the VLSI.
Using the software, we compute all the necessary parameters.
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6.2. The basic configuration of the electricity meter is programmed by the manufacturer in
accordance with the requirements of the Customer. The protection system allows you to access
different levels of programming and reading.
6.3. Each electricity meter has a password that is used for data exchange between the meter
and the external devices (portable device PRO UNIT or PC).
7. Overall and mounting dimensions
Mounting dimensions and position of the LCD is fully correspond to installation
dimensions and position of scoreboard of three-phase induction meters.
220 280
155
70
173
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8. Wirig diagram of electricity meter
Transformer connection of the meter to electrical, information and control circuits
is executed via terminal block, according to the following scheme:
Telemetric
output
Digital
Serial
interface
1
2
3
4 5
6
131212121111112131113
7
8


9
10
11
12 13


A
B
C
N
L
O
A
D




Direct connection of the meter to electrical, information and control circuits
is executed via terminal block, according to the following scheme:
Telemetric
output
Digital
Serial
interface
1
2
3
4
5
6



13 131212121111112131113

A
B
C
N

7
8

9
10
11
12

L
O
A
D

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
9. The procedure for preparation and installation
9.1. Before installing the meter it is necessary to inspect and verify that there is no mechanical
damage, and the seal which is specified by the manufacturer and the National Standards Body
is not broken.
9.2. The meter can be installed and exploited in enclosed spaces, in compliance with following
conditions:



Temperature operating range, C
Relative humidity, at 25 C, %
The atmospheric pressure, kPa (mmHg.)
-20+55
90
70-106,7 (537-800)
9.3. Open the cover of terminal
9.4. Install the electricity meter and fasten with three screws
9.5. Check and verify the absence of voltage in the external electric circuit.
9.6. Using the connection diagram, which is represented in this passport and can found on the
nameplate of electricity meter, connect meter to electrical, information and control circuits and
firmly tighten the wires to the terminals.
9.7. Supply voltage. The LCD will display information, the value and sequence of which is
given in paragraph 3.5.
9.8. In the presence of load, flashing LED indicates the process of electricity metering.
10. Calibration
10.1. The electricity meter shall be subject to the state primary periodic verification.
10.2. Calibration is performed according to the Calibration Method __________________
10.3. Calibration interval is _____ years.
10.4. The meter is equipped with a telemetry interface and LED for calibration.
11. Safety requirements
11.1. Safety degree of exploitation of this electricity meter corresponds to the 2nd class of
protection by GOST 26104 standards, and the degree of protection by IP51 scale, coded in
accordance with GOST 14254.
11.2. The electrical resistance between the shell and the electrical circuits shall not be less than:
 20 Megohms - under normal climatic conditions
 5 Megohms - with an upper value of the operating temperature and relative humidity of
not more than 80%.
11.3. Electrical isolation of circuits upon the shell and with each other under normal test
conditions, must withstand during one minute impact test voltage AC sinusoidal form 2000 v at
45-55 Hz.
11.4. Installation, connection and exploitation of the electricity meter should be carried out
strictly in accordance with "Rules of technical exploitation of electrical installations" and the
provisions of this technical certificate.
11.5. In order to avoid breakage and electric shock, it is strictly prohibited:
 To put or hang any items on the electricity meter
 To hit the shell and conjugation devices
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12. Sales Package
12.1. Three-phase multi-tariff electricity meter CТЭМ-3А (TMEM-3A)
12.2. Terminal cover with a screw
12.3. Technical certificate
12.4. Warranty card
12.5. Packing box
-1pc.
-1pc.
-1pc.
-1pc.
-1pc.
13. Package
The electricity meter is packed into a cardboard box with a size of 300х190х100 mm. For
transportation they stack 10 pieces of electricity meters in additional cardboard shipping
container with a size of 380х300х500 mm.
14. Transportation
14.1. The climatic conditions of transportation must satisfy the following conditions:



Temperature operating range, C
Relative humidity, at 25 C, %
The atmospheric pressure, kPa (mmHg.)
-50+70
95
70-106,7 (537-800)
14.2. The meter can be transported by any means of transport, provided protection from the
direct influence of atmospheric precipitation and compliance with the abovementioned
conditions of transportation.
15. Storage
15.1. Before starting operation the meter should be stored in a box in storage, where the
temperature is 0-40 C, and the relative humidity at 35 C should be 80.
15.2. The meter without packaging can be stored at a temperature of 10-35 °C and relative
humidity of 80% at 25 °C.
16. Manufacturer’s warranty
16.1. The warranty period of exploitation is ____ years from the date of sale of electricity
meter.
16.2. After the warranty period, for repairing of the meter pays the Customer/Consumer.
16.3. During the lifetime of the meter the manufacturer provides repairing and modernization
of the meter, even if the meter is out of production. For post-warranty repair and modernization
pays the Customer/Consumer.
16.4. The manufacturer must provide warranty repair of the meter:
 If you abide the terms of transportation, storage, installation and exploitation contained
in this technical certificate.
 If the manufacturer's seals are not disrupted
 In the absence of physical damage of the shell and the viewing window
 If you have this technical certificate and the warranty card
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17. Certificate of acceptance
Three-phase multi-tariff electricity meter СТЭМ-3А with the serial number _____________
verified and corresponds to GOST 30206-94, GOST 30207-94 standards, and is valid for
operation.
Stamp of the main controller ______________________________
Date of production
________________
Stamp and signature of the seller
Date of Sale
_________________________
______________________
Warranty service is valid until
__________________________
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