Email For Inquiry:overseas@hexcell.cn      

Global Serivce Tel: (+86) 186-8200-5391    Spanish&Russia Website http://www.hexcellchina.com/ 


DTS1088W1 CT Meter
(TSWS05(S10)(S20)Lv.24I(P)(G)(L).DL-W )
Electronic Meter for Electric Energy Measurement
The Instruction Manual
1 General
DTS1088W Three Phase Four Wires electronic meter is made of high-quality optimized long-life components and designed in advanced SMT technique with good performance on reliability, accuracy and load ranges. It can be used to measure rated hertz 50HZ single phase AC active energy with high accuracy, wide range, and high sensitive and low consumption. It can realize forward & reverse active TOU energy measurement; remotely upload voltage, current, hertz, power factor, etc; remotely setting load profile, KWH freezing, errors report, AMR function. It can do field reading by PC and HHU. or it can realize remote reading by M-Bus, GPRS, PLC, RS485, RS232 to simplify the management of system.
1.1 Parameters
Standards:   IEC62052-21:2003;
IEC62053-21:2003;
IEC62052-11:2003
System Management:ISO9001-2008;
Rated Voltage Un=230V;
Rated Current Ib=10(60)A;
Rated Hertz    50Hz±2%;
Measuring Accuracy: Class 1
Starting Current   ≤0.004Ib;
Power Consumption Voltage Circuit≤1.5W; 10VA,Current Circuit≤4VA;
Working Temp.  -30℃~+70℃;
Storage Temp.  -40℃~+75℃;
Communication Module: PLC, GPRS, RS485, Optical Head
Protocol: DLMS/COSEM
Display: LCD, KWH 6 Integers and 2 decimals
Battery: 3.6 V, 1.2Ah,Life span>10 years. Replaceable batteries outside
Dimension:  304.5 mm×180 mm×101.5 mm
Weight: 2kg
1.2 Performance
1.2.1 Measure: High Accuracy, no need to calibrate after long term operation. Measure real time voltage, current, power factor. Calibrate errors by software.
1.2.2 Measure Live & Neutral line simultaneously to prevent tampering.
1.2.3 Remote data reading, monitoring and controlling by M-Bus, GPRS, PLC, RS485, 
1.3 Working principle
This section contains theory of operation plus measurement techniques and calculations used by the meter. It also contains a measurement selection guide.
Theory of Operation:
The theory of operation of the meter is described in conjunction with the block diagram shown in follow.
1.3.1 Sensing Devices
Three integrated power measurement DSP chip and each device which combines two ∆Σ analog-to-digital converters, power calculation engine, energy-to-frequency converter, and a serial interface on a single chip. The device is equipped with a computation engine and could finish all kinds of energy calculations that needed. It is designed to accurately measure instantaneous current and voltage, and calculate VRMS, IRMS, instantaneous power, apparent power, active power, and reactive power for each phase. Energy Data Linearity: ±0.1% of Reading over 1000:1 Dynamic Range
1.3.2 Data Acquisition
The DSP chip incorporates a serial port transmit and receive buffer with a command decoder that interprets one-byte (8-bit) commands as they are received. It will transmit the energy data which include voltage, current, active power and reactive power to the Micro-Controller-unit after every sampling period.
1.3.3 MCU Controller (Micro-Controller-unit)
The microcomputer is an 8-bit NEC processor. It provides the register and display functions of the meter. It receives, accumulates, and operates on the values from the DSP. These values are sent over the control bus to the Flash&EEPROM for storage.
The microcomputer communicates through the OPTOCOM, RS485 and RS232 (GPRS/PLC) port for reading and programming. Its user programming controls the behavior of the meter.
1.3.4 Nonvolatile Memory
The meter is equipped with nonvolatile memory flash that stores the freezing data and load profile data, EEPROM that stores programmed information, billing quantities and calibration data. 
1.3.5 Power Supply
The  meter is available with one, of two, wide range solid-state switching type power supplies: 120V to 480V, +10% –20%. Warning: do not exceed 575 Volts for the 120-480V supply.
1.3.6 Time Keeping Battery
A standard 3.6V, half-size AA, lithium battery maintains the meter clock when the meter is programmed as a time-of-use meter or demand meter with Load Profile recorder. Since all billing and programming information is stored in nonvolatile memory, the battery is only used for maintaining date and time information during a power outage.
1.3.7 Methods of Calculation
This section discusses the methods of calculation used to determine the momentary interval quantities and their subsequent processing by the microcomputer.
The DSP receives current and voltage inputs for each phase from the DAP chip at rate of 4000 samples per second. The processor filters each of these signals for DC. Then it applies the gain and phase adjustment that was determined during the meter calibration.
Figure 1-3 The DSP devices Power Calculation Flow. (1 phase)
1.3.7.1 The apparent power (S)
The apparent power (S) is the combination of the active power and reactive power, without reference to an impedance phase angle, and is calculated by the DSP using the following formula:
S =VRMS×IRMS
1.3.7.2 Power Factor (PF)
Power Factor (PF) is the active power (PActive) divided
By the apparent power (S)
The sign of the power factor is determined by the active power.
1.3.7.3 The reactive power (QTrig)
The DSP calculates the reactive power, QTrig utilizing trigonometric identities, giving the formula
1.3.7.4 The Average power (QAvg)
Average reactive power, QAvg, is generated by averaging the voltage multiplied by the current with a 90° phase shift difference between them. The 90° phase shift is realized by applying an IIR digital filter in the voltage channel to obtain quadrate voltage (see Figure 3). This filter will give exactly -90° phase shift across all frequencies, and utilizes epsilon (ε) to achieve unity gain at the line frequency.
1.3.7.5 The instantaneous quadrate voltage (VQ) and current
The instantaneous quadrate voltage (VQ) and current (I) samples are multiplied to obtain the instantaneous quadrate power (Q). The product is then averaged over N conversions, utilizing the formula
1.3.7.6 Fundamental active (PF) and reactive (QF)
Fundamental active (PF) and reactive (QF) power is calculated by performing a discrete Fourier transform (DFT) at the relevant frequency on the instantaneous voltage (V) and current (I). Epsilon is used to set the frequency of the internal sine (imaginary component) and cosine (real component) waveform generator. The harmonic active power (PH) is calculated by subtracting the fundamental active power (PF) from the active power (PActive).
1.3.7.7 The peak current (Ipeak) and peak voltage (Vpeak)
The peak current (Ipeak) and peak voltage (Vpeak) are the instantaneous current and voltage, respectively, with the greatest magnitude detected during the last computation cycle. Active, apparent, reactive, and fundamental power is updated every computation cycle.
2 Display & Indicators
2.1 LCD Display
2.2 Status Indicator 
There are three long life span diodes LED below LCD Display. LEDs are used to indicate meter status as follows:
- Active pulse light: red, usually off, flashes when active energy metering;
- Reactive pulsed light: red, usually off, flashes when reactive energy metering;.
- Alarm LED: red, usually off, light on when there is a long bright signal.
2.3 Remarks
-Use LCD electronic displays
-With automatic cycle & cycle by button
-In automatic cycle display model, each screen displayed by default interval is 10 seconds.
-When power off, it can be woken up by pushing bottoms; if there is no operation after waking up, LCD display automatic turn off after a cycle
-Energy digit shown as 6-bit integer, 2 decimal places, and unit is kWh and kvarh.
-RJ output port: Meter has the active/reactive impulse output port and multifunctional output port for inspection, for detection method please refer to the wiring diagram.
3 Functions
3.1 Measuring
Meters should have the following features:
1)Forward total active energy with tariffs (L1,L2,L3), forward active energy with tariffs, reverse total active energy with tariffs (L1,L2,L3), reverse active energy with tariffs.
2)Forward current (L1,L2,L3) reverse current (L1,L2,L3) 
3)Voltage (L1,L2,L3)
4)Forward total active power(L1,L2,L3), forward active power, reverse  total active power(L1,L2,L3), reverse active power.
5)Total PF(L1,L2,L3), PF.
6)Forward active demand, reverse active demand, forward total active MD with tariffs, forward total active MD with tariffs.
7)Frequency.
3.2 Task and history data
Meter can record the history data which uses 1 minute,15 minutes,1 hour,1 day,1 month,3 month and 1 year as a cycle, data stored in the Nonvolatile RAM; Different types of history data has different storage cycle. The new data will cover the oldest data once the data storage is full.
1 minute history data
Storage cycle is the latest 1 day, storage data includes current date, forward active electric energy, reverse active electric energy.
Data record refer to Fig. 1
15 minute history data
Storage cycle is 60 day, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 2
1 Hour history data
Storage cycle is 60 day, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 2
1 Day history data
Storage cycle is 60 day, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 2
1 Month history data (Electric energy)
Storage cycle is the latest 12 months, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 2
1 Month history data (Maximum demand)
Storage cycle is the latest 12 months, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 3
3 Months history data
One time storage per 3 months, namely Jan, April, July, Oct, Storage cycle is the latest 12 months, storage data includes current date, forward active electric energy and various tariff, reverse active electric energy and various tariff.
Data record refer to Fig. 2
Yearly historical data
Storage period is one year, including the current date and time, total energy and total positive active power, various rates, the total negative active power and all energy rates.
For the recorded date please refer to Fig. 2
Fig.1 1 minute curve record values:
Fig. 2 Energy curve record values:
Fig. 3 Max demand curve record values:
3.3 TOU
It supports multi-tariff meter measurement functions.
Daily tariff
Supporting maximum 8 tariffs, the first daily tariff is on Sunday, and the second to seventh respectively is Monday to Saturday. Every day can be set for 4 tariff time periods.
Before setting up the tariff, we need to set up spare tariff firstly (attribute 9 of Activity Calendar), and set up activation time. After the activation time reaches (attribute 10 of Activity Calendar), the meter would use the new tariff solution.
Holiday tariff 
The meter can be set up for maximum 100 days’ holiday tariff. User can choose it among 8 daily tariffs according to their needs.
3.4 Display Control
3.4.1 Display
The LCD has the following format:
LCD size: 76mm × 30MM.
Digit size: 10.94mm × 4.37mm.

3.4.2 Display Mode
The meter has 3 display modes, manual display, scroll display and history data display.
Manual display and scroll display
Press the up key or down key, it will turn into manual display mode and the backlight is on, all of the measurement data can be set as displayable items. It’s able to display 99 maximum items, if no button operation within the set time, the meter would switch to scroll display mode automatically. Time could be changed via the third attribute” Scroll display ”object (0.0.21.0.1.255).
History data display
The meter can display import total active energy of the last twelve months, when press “History Key” (bottom on the top), the LCD will turn into PIN code model. PIN code is a 4-digit number. Press the up key, you can Switch the input position and press the down key, you can input data. After finished inputting, press the first key to verify password, if the password is correct then it will turn into historical data display mode. LCD default display “Import Active Energy” of last month, during this model it will display “Import Active Energy, Export Active Energy, Import Reactive Energy and Export Reactive Energy” by switching “History Key”, it will also display the last 12 month historical data by up key or down key.
If you enter the wrong PIN code three times in succession, the “History display mode” will be locked for 5 minutes. After 5 minutes you can re-enter the right PIN codes to enter the historical data display mode.
3.5 Customer interface
Meter data can be synchronized output via the user interface at the top of the case; the data output through AES128 encryption, secret key can be set by attributes 2 of "0.0.96.127.12.255" object.
The user interface is a serial interface only used for output. The baud rate is 4800 and has 8 data bits, NONE Parity.
User interface output data format is as follows:
1.0.1.8.0.255 33.88 KWh  --- OBIS code, data and unit
07.03.2015 Meter date
16:50:51 Meter time
12345678900000 Meter number
3.6 Communication 
Meter has four communication interfaces and two sets of digital input and output interfaces.
RS485
RJ45 interface, communication protocol DLMS, transmission speed 9600, NONE parity. Communication speed can be set via attribute 2 of "0.0.96.50.11.255".
IR Port
Communication protocol DLMS, transmission speed 9600, NONE parity. Communication speed can be set via attribute 2 of “0.0.96.50.12.255“
Uplink communication interface
This interface can be used for GPRS or PLC, the communication protocol DLMS.(9600,8,NONE )
Downlink communication interface
This interface can be used for M-bus communication which used for reading water, gas, heat meters and other equipment.
Meter is in slave mode.
2 set of interfaces can be used for digital input and output, for specific interfaces please refer to “Electrical Interface Figure“.
3.7 Security
DLMS protocol have 2 levels security connection, both are ‘high-level-security-mechanism’, with passwords default set as 8 digits of 0x30.
All communication data and user interface data are encrypted via AES 128, the default value of encryption key is 0x30 repeat for 16 times. (default key value of user interface output is also the same) 
It will automatically calibrate firmware(measurement part) when starting the meter. If the firmware is modified, the meter will record it automatically. The calibration adopts MD5 algorithm, meter memory are also stored firmware MD5 check code, it can be read via attribute 2 of ”0.0.96.127.15.255”.
3.8 Real Time Clock
High accuracy clock, f = 3.8ppm,60*60*24*3.8ppm = 0.328(s/day)at 0~50℃,and the battery lifetime is 10 years.
Day light saving
Daylight saving time begins at every Sunday 2:00 of the last week of March each year, the meter will automatically increase the time forward one hour and recover after the end of daylight saving time, the end time is at every Sunday 3:00 of the last week of October each year.
3.9 Firmware Upgrade
Meter support firmware upgrades. 
To upgrade firmware must first perform the upgrade initialization, after that the meter will initialize the upgrade parameters and prepare storage space, and then wait for the file transfer. When the file transfer is complete, it needs to calibrate it. The meter stores operating status information for upgrading, it can be read via image object. When the upgrading ststus is “VERITY_SUCCESS”, it can be executed upgrade activation, for specific upgrade process and method of operation please refer to “DLMS UA blue book” image transfer object.
3.10 Logfile
Meter event is divided into ”no volatile ” and“volatile”
No volatile Event
Permanent storage cannot be covered,maximum 384 events;Once full storage,display “ ”symbol.
Record and store following “no volatile” event
Successful authentication (only rs485 and IR)
Record the happened date, time and ports of operation, port number is 0, means this communications is infrared communications; port number is1, means RS485.
Firmware Upgrade
Record the date of firmware upgrade and the version number of firmware.
Time Setting Event
Record the operation event which there is a 27 seconds (3% of 15 minutes) difference between meter collation time and current time, this event record the meter collation time and the current time.
Magnetic Event
Detecting the magnetic event, which records the starting time and ending time.
Open housing terminal
Detecting tail-hood opening event, which records the starting time and ending time.
Remove communication module
GPRS/PLC module’s drawn even, which records the happened date and operation type. 
Meter boot Event
Meter re-boot even,which records the happened date and time.
Meter reset Event
Meter reset event,which records the happened date and time.
Error Event
Meter error event, keep a record  of date /time and the error status word
Status word by 1 byte, specific said as follows
Alarm/Error reset
Remove alarm status of the event, when magnetic field event,meter cover opening,pull out the communication module(uplink and down link) and error event occurred ,there will be an alarm flag “ ” display on the LCD,and this flag will not disappear until the operation of clear alarm occurred 
Reconfiguration of AES encryption key
Reconfiguration of AES encryption key event, keep a record  of date /time and the operation 
Communication port shown below:
0   Infrared communication port
1   RS 485 port
2   downlink communication port
3   uplink communication port (GPRS/PLC)
Relay off/on 
Relay off/on event, keep a record of date /time and the operation communication port
MBUS device (gas, water, heat) add/remove mbus meter
Remove MBUS device event, keep a record of date /time and the operation type. When operation type is 1,means the operation of pull out the module, When operation type is  0,means the operation of inset the module,
Metrological integrity
Detect the event of firmware Metrological changed, keep a record  of date /time and the new MDS 
Volatile Event
Circulation records in recent 10 events, After the store is full, new events will cover the oldest event
Meter store Volatile event shown below:
Power off/on
Power off/on event, keep a record of date /time
Voltage drop ±15%
Voltage drop ±15% event, keep a record  of date /time,end date/time and the voltage of L1 L2 L3
Shift (jump) of Lambda PF
power factor is greater than the setting value event, keep a record  of date /time and end date/time
Over current
Over current event, keep a record  of date /time,end date/time and the current of L1 L2 L3
Exceed demand
Meter current demand is greater than the setting value event, keep a record  of date /time,end date/time and current demand.
Frequency Event
Current frequency drop +-1% event , keep a record  of date /time,end date/time and frequency value
3.11 Meter Operate Mode 
Meter can configured as two operating mode(smart meter or normal meter), normal meter mode without 1minute, 15 minute,1hour and 1day freezing data.
The flag “ ” on the LCD shows the meter operation mode, LCD display this flag shows the current operation mode is normal meter
3.12 Signal output
Meter has LED impulse and Electrical pulse output function,  the characteristics of optical test output device comply the requirement  OF IEC 62052-11. the characteristics of electric test output device comply the requirement  OF GB/T 15284—2002
4 Meter outline dimensional and wiring diagram
4.1 Outline dimensional drawing



4.2 Wiring diagram
4.3 Active/reactive impulse output & Multifunction output port wiring diagram
5: Technical Specifications
Operating Ranges
Nameplate nominal range Operating range
Voltage 58~400V 58~440V
Current 0 to Maximum amperes
Frequency Nominal 50 or 50 Hz ±2%
Temperature range -40℃ to 85℃ inside the meter cove
Humidity range 0 to 100% non-condensing
Operating Characteristics
Typical Specification
SECTION – L  (Contd.)


Memory

Manufacturer: Shenzhen Hexcell Electronics Technology Co., Ltd
Address: 1-6# Bldg., Tongfuyu Industrial Zone, Aiqun Road, Bao'an District, Shenzhen, P. R. China.
Telephone: +86 755 26621719
Fax: +86 755 26621430
Post code: 518108
E-Mail: overseas@hexcell.cn
Website: http://en.hexcell.cn