General Introduction
Summary
Intelligent energy meters are independently developed and produced, in compliance with relevant standards for energy meters such as GB/T17215.301-2007 and DL/T614-2007. They adopt the DL/T645-2007 communication protocol, have rich functions, and high added value.
Principle composition
Taking a three-phase four wire energy meter as an example, the principle is shown in the following figure: it consists of peripheral interfaces such as current transformers, metering chips, microprocessors, temperature compensated real-time clocks, STN LCDs, and communication data.
Technical Specifications
Main parameters
| project | Technical Requirements |
| Reference voltage | 3×57.7/100V；3×220/380V；3×100V；3×380V |
| Meter operating voltage range | 0.8Un—1.15Un |
| Current measurement range | Transformer connection type: 1.5 (6) A, 0.3 (1.2) A |
| accuracy class | Active power: 0.5S level, 0.2S level Reactive power: Level 2 |
| Operating Temperature | -25℃~+60℃ |
| Extreme working temperature | -40℃~+70℃ |
| atmospheric pressure | 63kPa~106.0kPa (altitude 4000m and below), except for special ordering requirements. |
| relative humidity | ≤ 95% (no condensation) |
| frequency range | (45~65)Hz |
| starting current | Transformer connection type: 1 ‰ In (0.2S level) |
| Meter power consumption | <2w，10va2w，10va< |
| MTBF | ≥6×10⁴h |
| Note: Special specifications can be customized. | |
Optocoupler pulse
| Pulse output constant | The factory settings are based on the meter panel identification. For a 1.5 (6) A meter, it is usually set as: Table of 3 × 57.7/100V: Merit: 20000 imp/kW · h Reactive power: 20000 imp/kvar · h |
| Pulse output width | (80±16)ms |
| Maximum allowable passing current | 10mA（DC） |
| Working Voltage | 5V～24V（DC） |
Calendar clock
| Clock error | ≤ 0.5/s/d (at 0 ℃~+40 ℃: ± 2ppm; -± 3.5ppm at 40 ℃~+85 ℃) |
| clock frequency | 1Hz |
| battery life | 10 years |
| Continuous working time of battery | ≥ 5 years |
Other data
| Exterior specifications (mm) | Installation size (mm) |
| 290×170×85 | 240(256) ×150 |
Main functions
electricity metering
This instrument can measure positive and negative active power, as well as reactive power in quadrants 1, 2, 3, and 4, and can be used to set the combined active and reactive electrical energy accordingly. And it can realize the measurement and recording of combined reactive power 1 and combined reactive power 2.
All types of electricity can be measured by time of use based on the total and maximum four tariff periods. The total electrical energy should not be calculated by arithmetic addition of the electrical energy of each phase.
Can store electricity data for 12 settlement cycles.
For positive and negative active power, positive and negative apparent power, reactive power in quadrants 1, 2, 3, and 4, as well as active and reactive power in phases A, B, and C, the effective value range of electrical energy is 0~999999.99, measured in kWh or kvarh.
For combined active power, combined reactive power 1, and combined reactive power 2, the effective value range of electrical energy is -799999.99~799999.99, measured in kW · h or kvar · h.
The default decimal place for displaying electrical energy is 2 decimal places at the factory.
Time slot rate
This meter can set up two sets of time zone tables and two sets of daily time zone table schemes, as well as the respective switching times (year, month, day, hour, and minute) for the two schemes. The electricity meter defaults to running the first set of time zone meter scheme and the first set of daily time zone meter scheme. After the electricity meter switches to the time zone meter scheme, it switches to another set of time zone meter scheme and runs until the switching time of the smart energy meter product manual for the daily time zone meter is reached. It then operates according to the other set of daily time zone meter scheme; Set the switching time for the two schemes again. After the electricity meter runs to the time zone scheme switching time, switch to the first time zone scheme for operation. After running to the time zone scheme switching time, operate according to the first time zone scheme. If the switching time for the two sets of time zone tables and daily time zone table schemes is set to "FFFFFFFFFF", then the two sets of annual time zone tables and daily time zone tables cannot be switched.
After switching between the time zone table scheme and the daily time zone table scheme, the switching time is reset to zero.
Maximum 4 rates. Each time zone table scheme can set a maximum of 14 time zones, the starting date of each time zone, and the time zone table number used. Each set of daily time slot schedule scheme can set a maximum of 8 daily time slot schedules, with a maximum of 14 time slots per day. The starting time and rates for each time slot can also be set. The minimum interval between time periods is 15 minutes, and the interval between time periods is greater than the actual demand cycle value, which can be set across zero points. Each time period is arranged in ascending order of time.
Support the setting of special rate periods for public holidays and weekends.
If the rate number of a certain period in the daily schedule is greater than the rate number, or the rate number is 0, the electricity in this period will be included in rate 1.
Quantity measurement
Capable of measuring positive and negative active power, positive and negative apparent power, reactive power in quadrants 1, 2, 3, and 4, and the maximum demand and occurrence time of combined reactive power 1 and 2. And store data with time stamps
The demand cycle and slip time can be set within the range of 1 to 60 minutes, but they should meet the following conditions: the demand cycle is greater than the slip time and is an integer multiple of it, and the demand cycle can be selected from 5, 10, 15, 30, and 60 minutes; The slip time of the slip type demand cycle can be selected from 1, 2, 3, and 5 minutes. The demand cycle should be an integer multiple of 5 of the slip time, and this multiple should be less than or equal to 15.
When there are situations such as voltage line power on, time period conversion, reset, clock adjustment, demand cycle change, power flow direction conversion, etc., the energy meter measures the demand according to the demand cycle from the current time. After the first demand cycle is completed, the maximum demand is recorded according to the slip interval. Among them, when there is a time period transition, the total demand continues to be measured according to the slip, and the hourly demand starts to be measured again according to the demand cycle.
Do not record the maximum demand within an incomplete demand cycle or when modifying the demand cycle.
Can store maximum demand data for 12 settlement days.
The default decimal place for demand display is 4 decimal places at the factory.
Settlement function
This table not only provides the current total and hourly electricity consumption, maximum demand, and occurrence time of active and reactive power, but also stores historical data from the previous 1 to 12 settlement cycles (including combined active power, forward and reverse active power, combined reactive power 1 and 2, four quadrant reactive power, active and reactive power of each component, total reactive power consumption, and hourly electricity consumption; forward and reverse active power, combined reactive power 1 and 2, and maximum demand and occurrence time of four quadrant reactive power). When the clock of the electricity meter reaches the settlement point, the electricity meter settles. When settling the electricity meter, the current electricity quantity, maximum demand, and its occurrence time are first stored in the previous settlement day, and then the current maximum demand and its occurrence time are reset to zero. The accumulation unit for calculating demand is reset to zero, and the demand calculation starts again.
If the electricity meter loses power and crosses the settlement point, it should be able to replenish the energy and demand data of the previous 12 settlement days when powered on. If the power loss crosses the first settlement day of each month, the demand will be reset to zero after the demand is transferred. On other settlement days, the demand data will not be transferred.
Up to three settlement days can be set per month, with the first settlement day enabled by default. If the value of each settlement day is 9999, it means that this settlement day has not been set.
Quantity settlement is only settled once on the first settlement day of each month. If other settlement days are used and settlement is made at that settlement point, the corresponding quantity data for that settlement day will be supplemented with FF.
Event log
Voltage loss: It can record the total number and cumulative time of voltage loss, the time of the most recent voltage loss, the end time, and the total number and cumulative time of voltage loss for each phase. It also includes data such as the time of the last 10 voltage loss occurrences, the end time, and the electrical energy readings during the voltage loss period.
Initial conditions: The voltage is less than NN% Un (NN is the threshold for the percentage of starting voltage for voltage loss), the current is greater than NN-NNNNA (NN. NNNN is the starting current for voltage loss), the maximum voltage is greater than the critical voltage, and the duration is greater than the set delay time for voltage loss event determination.
End condition: Voltage greater than 85% Un, or voltage below the critical voltage, or power failure.
Undervoltage: It can record the total number and cumulative time of undervoltage in each phase, as well as the time and end time of the last 10 undervoltage occurrences, and the electrical energy readings during the undervoltage period.
Initial condition: The voltage is below NN% Un and the maximum voltage is greater than the critical voltage, and the duration is greater than the set undervoltage event determination delay time.
End condition: Voltage greater than NN% Un or maximum voltage less than critical voltage or power failure.
Overvoltage: It can record the last 10 overvoltage data of phases A, B, and C.
Initial condition: The voltage is greater than NNNN% Un (overvoltage judgment threshold), the maximum voltage is greater than the critical voltage, and the duration is greater than the set overvoltage event judgment delay time.
End condition: The voltage is below the overvoltage judgment threshold, or both voltages are below the critical voltage, or there is a power outage.
Phase failure: It can record the total number and cumulative time of phase failures for each phase, as well as the time and end time of the last 10 phase failures and corresponding electrical energy readings.
Initial conditions: The voltage is less than NN% Un, the current is less than NN-NNNNA (phase failure starting current), the maximum voltage is greater than the critical voltage, and the duration is greater than the set phase failure event determination delay time.
End condition: Voltage greater than the critical voltage, current greater than the phase failure starting current, voltage both below the critical voltage, or power failure.
Total voltage loss: It can record the total number and cumulative time of total voltage loss, the time of the last 10 occurrences, the end time, and the latest current value.
Initial conditions: All phase voltages are below the critical voltage NN% Un, and the maximum current is greater than 5% In, with a duration greater than 60 seconds.
End condition: The maximum voltage is greater than the critical voltage, or the maximum current is less than 5% In, or there is a power outage.
Voltage reverse phase sequence: It can record the total number and cumulative time of voltage reverse phase sequences, as well as the end time and energy readings during the last 10 occurrences.
Initial condition: Voltage reverse phase sequence occurs and the minimum voltage is greater than the critical voltage, with a duration greater than 60 seconds.
End condition: The voltage reverse phase sequence ends and the maximum voltage is less than the critical voltage or power is lost.
Loss of current: It can record the total number of times each phase has lost current, the cumulative time, the end time of the last 10 loss occurrences, and the displayed energy value during the loss period.
Initial condition: The current of this phase is less than NN-NNNNA (current loss starting current), and the current of the other phases is greater than NN-NNNNA (current loss ending current), and the maximum voltage is greater than the set voltage triggering lower limit of the current loss event, and the duration is greater than 60 seconds.
End condition: The current of the phase is greater than NN-NNNNA (current loss starting current), or the voltage is lower than the set voltage triggering lower limit of the current loss event, or the power is lost.
Overcurrent: It can record the most recent 10 overcurrent data of phases A, B, and C.
Initial condition: The current of a certain phase is greater than NNN. N% Ib (overcurrent judgment threshold), the maximum voltage is greater than the critical voltage, and the duration is greater than the set overcurrent event judgment delay time.
End condition: The current of a certain phase is less than the overcurrent judgment threshold, or the voltage is both less than the critical voltage, or there is a power outage.
Flow interruption: It can record the total number and cumulative time of flow interruption for each phase, as well as the time and end time of the last 10 flow interruptions, and the displayed energy value during the flow interruption period.
Initial conditions: The voltage is greater than NNNN% Un and the current is less than NN-NNNNA, and the maximum voltage is greater than the critical voltage, and the duration is greater than the set interruption event determination delay time.
End condition: Voltage less than NNNN% Un, current greater than NN-NNNNA, or maximum voltage less than the critical voltage.
Reverse Current: It can record the total number and cumulative time of current reversals in all directions, as well as the time and end time of the last 10 current reversals, and the energy readings during the voltage loss period.
Initial condition: When the phase angle between voltage and current is greater than 90 degrees and less than 270 degrees, the current reverses. When determining the reverse flow of a certain phase, the active power of that phase should be greater than NNNN kw, and the duration should be greater than the set delay time for determining the reverse flow event.
End condition: Phase angle greater than zero and less than 90 degrees, phase angle greater than 270 degrees and less than 360 degrees, voltage less than 10V, current less than starting current, or power failure
Voltage qualification rate: It can record the statistical data of voltage qualification rates for the current month and the previous 12 months for the total, A, B, and C phases.
Voltage qualification rate (%)=(1-Voltage over limit time/Total voltage monitoring time) × 100% Voltage over limit
Initial condition: The phase voltage is greater than the qualified upper limit NNN.NV and less than the assessment upper limit NNN.NV.
End condition: The phase voltage is less than the qualified upper limit NNN.NV, or greater than the assessment upper limit NNN.NV, or loses power.
Voltage qualified
Initial condition: The phase voltage is greater than the qualified lower limit NNN.NV and less than the qualified upper limit NNN.NV.
End condition: The phase voltage is less than the qualified lower limit NNN.NV, or greater than the qualified upper limit NNN.NV, or loses power.
Voltage exceeds the lower limit
Initial condition: The phase voltage is less than the qualified lower limit NNN.NV and greater than the assessment lower limit NNN.NV.
End condition: The phase voltage is greater than the qualified lower limit NNN.NV, or less than the assessment lower limit NNN.NV, or loses power.
Voltage imbalance: It can record the last 10 voltage imbalance events.
In a three-phase power supply system, the voltage imbalance rate is:
Initial condition: The voltage imbalance rate is greater than NN% (the upper limit of voltage imbalance), and the maximum voltage is greater than the critical voltage, and the duration is greater than the set delay time for determining the voltage imbalance rate.
End condition: The voltage imbalance rate is less than the upper limit of voltage imbalance, or the voltages are all below the critical voltage, or there is a power outage.
Current imbalance: It can record the last 10 current imbalance events.
In a three-phase power supply system, the current imbalance rate is:
Initial conditions: The three-phase currents are all greater than 5% In, the current imbalance rate is greater than NN% (the upper limit of current imbalance), the maximum voltage is greater than the critical voltage, and the duration is greater than the set delay time for current imbalance determination.
End condition: The current imbalance rate is less than the upper limit of current imbalance, or the voltage is below the critical voltage, or there is a power outage.
Overload: Record the total number and duration of overloads for each phase, as well as the duration of the last 10 overloads.
Initial condition: The active power of a certain phase is greater than the lower limit of active power, the maximum voltage is greater than the critical voltage, and the duration is greater than the set overload event determination delay time.
End condition: The active power of a certain phase is less than the lower limit of active power, or the maximum voltage is less than the critical voltage, or there is a power outage.
Active demand exceeding limit: The last 10 instances of positive and negative active demand exceeding limit data can be recorded.
Initial conditions: The active power demand is greater than NNNNkW (the lower limit of active power), the maximum voltage is greater than the critical voltage, and the duration is greater than the set delay time for determining the excess of active power demand.
End condition: The active power demand is less than the upper limit of active power, or the voltage is both less than the critical voltage, or there is a power outage.
Reactive power demand exceeding limit: The last 10 instances of reactive power demand exceeding limits in quadrants 1, 2, 3, and 4 can be recorded.
Initial conditions: The reactive power demand is greater than NNNNkW (the lower limit of reactive power), the maximum voltage is greater than the critical voltage, and the duration is greater than the set reactive power demand limit judgment delay time.
End condition: The reactive power demand is less than the upper limit of reactive power, or the voltage is both less than the critical voltage, or there is a power outage.
Total power factor exceeding the lower limit: It can record the total number of times the total power factor exceeds the lower limit and the total cumulative time, as well as the time and end time of the last 10 occurrences of the total power factor exceeding the lower limit, and the electrical energy display data during the period of the total power factor exceeding the lower limit.
Initial conditions: The total power factor is less than NNNN (lower limit of power factor), the three-phase current is greater than 5% In, the maximum voltage is greater than the critical voltage, and the duration is greater than the set power factor lower limit judgment delay time.
End condition: The total power factor is greater than N.NNN and the maximum voltage is less than the critical voltage.
Power outage: It can record the total number of power outages and the end time of the last 10 power outages.
Time period and holiday programming: Record the daily time period table, annual time zone table, weekly and holiday programming times, as well as the last 10 programming times, operator codes, and pre programming data.
Programming with reactive power combination method: Record the total number of programming times for combined active power, combined reactive power 1, and combined reactive power 2, as well as the last 10 programming times, operator code, and pre programming data.
Settlement day programming: Record the total number of programming times on the settlement day, as well as the last 10 programming times, operator codes, and pre programming data.
Programming record: It can record the total number of programming times, the time of the last 10 programming times, operator code, and data identification of programming items.
Timekeeping: It can record the total number of timekeeping times, the time of the last 10 timekeeping times, and the operator code. Broadcast school time is not recorded as school entry time.
Opening the meter cover: It can record the total number of times the meter cover is opened, the occurrence and end time of the last 10 meter cover opening events, and the electric energy data at the time of the opening of the meter cover. During a power outage, the electric energy meter only records the earliest meter cover opening event.
Start button cover: It can record the total number of start button cover events, the occurrence and end time of the last 10 start button cover events, and the electrical energy data of the start button cover occurrence time. During a power outage, the energy meter only records the earliest start button cover event.
Meter reset: It can permanently record the total number of times the meter has been reset, the time of the last 10 meter resets, the operator code, and the energy data.
Demand reset: Record the total number of times demand reset, the time of the last 10 demand resets, and the operator code.
Event reset: It can record the total number of event resets, the time of the last 10 event resets, the operator code, and the event reset data identification code.
Constant magnetic field interference: It can record the total number of constant magnetic field interferences, the time of the last 10 constant magnetic field interferences, the operator code, and the constant magnetic field interference data identification code.
Meter reset to zero
Clear the electricity meter to zero, including the amount of electricity, maximum demand and occurrence time, frozen amount, non permanent records in event records, and load records.
The reset of the electric energy meter adopts a 98H level password and is issued in encrypted form as a security measure to prevent unauthorized operation. When the command is executed, the electric energy meter should ensure that the record of the meter reset event is not cleared and automatically save the corresponding data of the event.
It can permanently record the total number of times the meter is reset, the time of occurrence, the operator code, the data identification code of the first 10 programming items, and the data of the first 10 meter resets.
Clear demand to zero
Clear the current maximum demand and occurrence time data in the table.
The demand reset adopts a 98H level password and is issued in encrypted form to prevent unauthorized personnel from operating as a security measure.
It can record the total number of demand reset events, reset time, maximum demand before reset, and the first 10 demand reset data.
Event reset
Clear all stored data (excluding permanent records) or certain event records from the energy meter.
The event reset adopts a 98H level password and is issued in encrypted form to prevent unauthorized personnel from operating as a security measure.
It can record the total number of reset events, reset time, pre reset energy, and the reset data of the first 10 events.
Electricity freeze
Instantaneous freezing: After receiving the instantaneous freezing command, the meter freezes and saves the last 3 instantaneous freezing data.
Timed Freeze: It can be set to freeze on an hourly, daily, and monthly basis, saving the last 60 timed freeze data.
Daily Freeze: The daily freeze time can be set, with a default freeze at 00:00, and the last 62 days of daily freeze data can be stored. If the daily freezing time is missed during a power outage, the frozen data for the entire day will be replenished when the power is turned on, up to a maximum of the last 7 days of frozen data.
Agreed freeze: Freeze the electricity and other important data at the agreed time of switching between the primary and secondary annual time zone schemes/daily time zone table schemes/rate schemes, and store the last two switching records for each.
Whole hour freezing: The starting time and interval time for whole hour freezing can be set, and the last 254 whole hour freezing data can be stored.
Each type of freeze corresponds to a fixed pattern word, and the data that needs to be frozen can be set according to the pattern word. The frozen content should match the set pattern word.
Please refer to Appendix 2: Meter Mode Words and Feature Words for details of each freezing mode.
Load record
Supports six types of load data, and the load recording interval can be set arbitrarily from 1 to 60 minutes. The interval time for each type of load can be the same or different.
The content of the six types of data is: (1) voltage, current, and frequency of phases A, B, and C; (2) Total active and reactive power of phases A, B, and C; (3) Overall power factor of phases A, B, and C; (4) The total amount of positive active power, negative active power, combined reactive power 1, and combined reactive power 2; (5) Total reactive power in four quadrants; (6) Current demand for reactive power.
The electricity meter adopts a large capacity internal card to store load records, which can record the total active energy, total reactive energy, and four quadrant reactive energy in both forward and reverse directions. The data volume should not be less than 40 days with an interval of 1 minute
The content of the load record should match the load mode word setting.
voluntary reporting
The electricity meter supports active reporting of mode words and status words. The active reporting mode word is used to enable or disable active reporting events, and the active reporting status word indicates the occurrence status of the reported event.
The types of active reporting support can be divided into four categories, including meter faults, cover opening events, grid abnormal events, and meter operation faults.
Energy meter faults include: control circuit error, ESAM error, internal card initialization error, low clock battery voltage, internal program error, memory failure or damage, clock failure.
The second type of cover opening event: opening the watch cover and the opening button cover.
The third type of abnormal event in the power grid, once an abnormality occurs, indicates the existence of power grid line problems or electrical behavior, and line investigation should be carried out as soon as possible.
Abnormal events include: voltage loss, undervoltage, overvoltage, current loss, overcurrent, overload, power reversal, phase failure, current interruption, voltage reverse phase sequence, current reverse phase sequence, voltage imbalance, current imbalance, auxiliary power loss, demand exceeding limit, total power factor exceeding lower limit, severe current imbalance, and total active power reversal (excluding bidirectional metering). The fourth type of energy meter operation failure, once this fault occurs, indicates that there is a problem with the meter operation and needs to be dealt with in a timely manner. Operation faults include: power outage, meter reading, battery undervoltage, and overdrawn status.
Security Management and User Permissions
The parameters should be set according to the 98 or 99 level password.
The parameters of the electric energy meter are divided into three types of data. The first type of data is set with a 99 level password, the second type of parameters is set with a 98 level password, and the third type of data does not require password protection.
When remotely updating parameters through the RS485 communication interface, it should meet the requirement of remote identity authentication passing and being protected by 98 or 99 level encryption within the valid time of identity authentication. After the update is successful, the programming event record should be saved.
Before infrared operation, infrared authentication is required. Open the operation permission. If the authentication fails, only the meter number, communication address, record number, current date, current time, current energy, and infrared authentication query command can be read. Other information is not allowed to be read, and all information is not allowed to be set. In the event of a power outage and wake-up, the energy meter does not support infrared authentication.
measurement function
This instrument measures the total voltage, current, phase angle, apparent power, active power, reactive power, power factor, and grid frequency of phases A, B, and C, and displays the direction of power. Above the starting current, the power can be measured (the display is affected by the number of display bits), with a refresh time of 1 second. The measurement range is 1 ‰ Pn Pmax. Here, Pb represents the rated active or reactive power, and Pmax represents the maximum active or reactive power. The voltage and current are effective values, and the refresh time is 1 second. Voltage measurement range: 0.05Un~1.2Un for energy meters with auxiliary power supply, 0.6Un~1.2Un for energy meters without auxiliary power supply; Current measurement range: 0.05Ib~1.2Imax.
Measure frequency, with a frequency measurement resolution of 0.0000001Hz and a measurement range of 47.5-52.5Hz.
Calculate the phase angle of the total and each component based on the power factor, with a phase angle resolution of 0.01 °.
The minimum resolution for active power measurement is 0.000001kW, with an accuracy level of 0.5. When reading through communication, it should be displayed with 4 decimal places, and when displaying, it should be displayed with 0, 1, 2, 3, or 4 decimal places (determined by the number of decimal places in the power display); The minimum resolution for reactive power measurement is 0.000001kvar, with an accuracy level of 2.
The minimum resolution for voltage measurement is 0.0001V, with an accuracy level of 0.5. Communication reading does not include decimal places, and display includes 4 decimal places.
The minimum resolution for current measurement is 0.0001A, with an accuracy of 1.0 level (5% In Imax). Communication reading should have 2 decimal places, and display should have 4 decimal places.
Lcd With Backlight
During normal power supply, the white LCD backlight lights up in the following situations: key wake-up (up or down arrow keys), infrared wake-up (handheld or remote control). Use infrared to wake up the backlight, and turn off the backlight of the energy meter after 2 automatic rotation cycles; Use the button to wake up the backlight, which will turn off after 60 seconds of no button operation.
alarm function
The light alarm adopts the backlight lighting method for light alarm, and the alarm will automatically end when the event returns to normal.
The three-phase meter can trigger an alarm through an external alarm device connected to the alarm output terminal, and can be turned off by pressing a button. When the event returns to normal, the alarm will automatically end.
Alarm events include: voltage loss, reverse sequence, overload, power reverse (excluding bidirectional meters), battery undervoltage, etc.
Power outage meter reading function
An electric meter equipped with a low-power battery enters a low-power sleep state after the voltage circuit loses power. After 2 seconds, it can be awakened by pressing the up button, or by using a handheld device or remote control. After waking up, meter reading can be done through LCD display or manual meter reading. During power outage meter reading, load records cannot be read.
Clock and timing function
The clock has functions such as calendar, timing, and automatic leap year conversion.
Broadcast timing is not limited by passwords and hardware programming switches, but only accepts energy meters with clock errors less than or equal to 5 minutes for timing. It is only accepted for calibration once a day and does not accept broadcast timing within 5 minutes before and after midnight.
Through remote RS485、 Infrared and other communication interfaces can calibrate the time of the electric energy meter. In addition to broadcasting calibration, calibration must be carried out in a programmed state.
Signal output function
Equipped with two red LED indicator lights for outputting light pulses proportional to the measured electrical energy (active/reactive), with a pulse width of 80ms ± 16ms; an electrically isolated electrical pulse output terminal for outputting electrical pulses proportional to the measured electrical energy (active/reactive); The pulse output constant can be set, and the factory setting of the pulse constant is based on the identification on the instrument panel.
Equipped with multifunctional signal output terminals (00 time signal; 01 demand cycle; 02 time period switching; restored to time signal output after power on). Three types of signals can be converted through software settings on the same multifunctional signal terminal. When the energy meter is powered off and then powered on again, it defaults to the daily timing error detection signal. The time signal is a second signal, and the demand cycle signal and time period switching signal are pulse signals of 80ms ± 16ms.
Equipped with auxiliary terminal alarm control output function, the electric energy meter can output pulse or level switch signals to control external alarm devices when events such as voltage loss, current loss, and interruption occur.
Basic communication functions
This table supports basic communication such as far-infrared and RS485 communication. Before changing the communication address settings, passwords and other security verifications must be passed. When updating remote parameters, 98 or 99 level encryption protection should be used.
Infrared communication
Intelligent energy meter product manual 12 has one far-infrared communication interface, with a default communication speed of 1200bps. Through this communication interface, parameter settings and data reading within the energy meter can be performed, but password or other security verification is required before setting.
RS485 communication
Equipped with 2 RS485 communication ports, the default communication rate is 2400bps. Through this communication interface, parameters in the energy meter can be set and data can be read, but password and other security verifications are required before setting.
Self checking display function of electric meter
This electric energy meter has the function of monitoring various abnormal operations and displaying them with auxiliary abnormal codes. Including abnormal prompts related to faults and events in the electric energy meter, please refer to Appendix 3 for details on intelligent meter abnormal display codes.
Low power wake-up display function
An electric meter equipped with a low-power battery enters a low-power sleep state after the voltage circuit loses power. You can use buttons or infrared to wake up the LCD display of the energy meter, and there is no need to turn on the backlight at this time. If there is no button operation after the energy meter is awakened, it will automatically cycle through the cycle display items set in the energy meter and then turn off the LCD display; After the energy meter is awakened, if there is a button operation, press the button display items set in the energy meter to display. After 30 seconds of button operation, the LCD display will automatically turn off.
LCD display function (for reference only, subject to actual measurement)
LCD display character description:
Figure 2: LCD full screen display image
Battery level display:
The decimal places of electrical energy can be set between 1 and 4 digits. It can be set to 8 integers and 0 decimals (when the power display shows 0 decimal places), or 7 integers and 1 decimal place (when the power display shows 1 decimal place), or 6 integers and 2 decimal places (when the power display shows 2 decimal places), or 5 integers and 3 decimal places (when the power display shows 3 decimal places), or 4 integers and 4 decimal places (when the power display shows 4 decimal places).
Current displayed rate prompt:
Display the battery level for one time period on each screen, with the first character on the first line“
”For the current rate prompt, if displayed“
”To display the total battery prompt.
Four quadrant prompt:
use
The symbol is indicated by filling, displayed counterclockwise and counterclockwise
, indicating that the electricity meter is working in quadrant I, displaying
, indicating that the electricity meter is operating in quadrant II; display
, indicating that the electricity meter is working in quadrant III, displaying
, indicating that the electricity meter is operating in quadrant IV.
Communication prompt:
“
”Wireless communication online and signal strength indication, LCD display“
”Indicates module communication in progress, LCD display“
”Indicates that the first RS485 communication is in progress, displayed on the LCD screen“
”Indicates that the second RS485 communication is in progress, displayed on the LCD screen“
”Indicates that infrared communication is in progress.
Hanging indication of electric energy meter:
The total number of failed MAC and ciphertext verifications for data frames received every day reaches 200, resulting in“
”Reminder: Clear the suspended status and cumulative number of times at midnight every day.
Pressure loss prompt:
Under normal circumstances“
”Often displayed on LCD screens; When a phase breaks“”The corresponding phase disappears from the liquid crystal; When there is a loss of pressure“
”Correspondingly flashing.
Loss of current prompt: Under normal circumstances“
”Often displayed on LCD screens; When a certain phase experiences a current interruption (actual current is less than the starting current)“”The corresponding phase disappears from the liquid crystal; When there is a loss of current“”Corresponding to flashing, when both current loss and current interruption exist, the current loss status is displayed first.
Reverse prompt:
When the current of a certain phase reverses“”The corresponding phase flashes and the front often displays a "-". The reverse prompt will only be displayed when the current in this phase is greater than 1 ‰ In and the voltage is greater than 10V.
Current rate display: Current rate status (peak and valley)“
”.
Reverse phase sequence prompt:
When the voltage is in reverse phase sequence“
”Flashing.
Battery undervoltage prompt:
When the LCD appears“
”Indicates clock battery undervoltage; When the LCD appears“
”Indicates a power outage, meter reading, battery undervoltage indication.
Alarm prompt:
“
”Flashing, indicating LCD alarm prompt.
Historical electricity consumption:
When it is necessary to display historical demand and power consumption“
”It can display the historical electricity consumption and demand from "last January" to "last December".
Direction of electricity:
When displaying the battery level, the direction of the battery level is determined by“
”To display.
Key status prompt:
“
”When displayed, the meter is in the test key state and does not display as the official key state.
Time/Rate Reminder:“
”Represents the first and second time periods/rates, default to time periods, which can be set through meter operation feature word 1 (Bit1).
Display code prompt:
“
”Currently displaying code, top row“
”Indicate the data identifier corresponding to the wheel display/key display/full display data, bottom row“
”Indicate the composition sequence number of the wheel/key display data in the corresponding data identifier.
Data display prompt:
“
”Data display and corresponding unit symbols.
Power factor prompt: display“
”When is the power factor prompt, displayed separately“
”Time is the phase angle prompt.
Instructions for use
Display Settings
This table has two display modes: loop display mode and button display mode. The display code for loop display mode and button display mode is set by default according to the technical conditions of the smart meter. Please refer to Appendix 1: List of Items for Loop Display and Key Display for the display code table.
Loop display and button display can set parameters for the number of loop displays (0x04003001), loop display interval time (0x04003002), and number of button displays (0x04003005). The maximum number of display screens for both display modes is set to 99. The display interval time can be set within 5-20 seconds through programming, and the factory default value is set to 5 seconds.
For the display items of loop display and button display on each screen, it can be achieved by setting 0x04040101~0x040401FE, 0x04044021~0x040402FE. The setting method is as follows: for example, set the occurrence time of the maximum positive active power demand on the 9th screen under the first scheme, and set the content of 0x040401000009 to 0x0101000001; for example, set the maximum positive active power demand on the 8th screen under the first scheme, and set the content of 0x040401008 to 0x0101000000.
display mode
After power on, the meter will first display the full screen for 5 seconds, and then enter the loop display mode to display the loop display content. You can exit the loop display mode by pressing the up or down button to enter the key display mode and turn on the backlight. After 60 seconds of no key operation in the key display mode, the backlight will automatically turn off.
Parameter Settings
Using the "Three phase Multi functional Management Software" provided by our company as the upper computer platform, parameter settings can be made using RS485 or infrared. Before setting parameters, check whether the communication baud rate of the electricity meter matches the upper computer based on the selected communication method, and then enter the communication address of the electricity meter for communication connection. The setting conditions for parameters can be found in "2.11 Security Management and User Permissions". Refer to Appendix 2: Meter Mode Words and Feature Words for default parameter configuration and meter status reading.
install
Install the electricity meter according to the diagram (main terminal wiring diagram and auxiliary terminal wiring diagram).
It is necessary to strictly follow the wiring diagram attached to the end cover of the electricity meter for wiring. After the wiring is powered on, the displayed values and polarity of voltage, current, active power, and reactive power on the electricity meter can be checked. After 1 minute of power on, the display screen can be checked (whether there is voltage loss, current loss, reverse, or reverse phase sequence) to determine the wiring and meter operation status.
meter reading
By displaying the copy reading
Read meter data from LCD display through loop display and button display.
Read through communication
Read meter data through RS485 and infrared interface.
Power outage meter reading
An electric meter equipped with a low-power battery enters a low-power sleep state after the voltage circuit loses power. After 2 seconds, you can wake up by pressing the up button or by infrared wake-up. Non contact wake-up is prohibited after 7 days of power failure. After waking up, meter reading can be done through LCD display or through infrared communication. power outageWhen reading meters, load records cannot be read.
Battery replacement
When the LCD appears“
”Indicates clock battery undervoltage; When the LCD appears“
”Indicates a power outage and low battery voltage during meter reading.
For clock battery issues, users need to promptly notify the manufacturer to resolve and handle them.
For the issue of battery undervoltage in power outage meter reading, users should promptly replace the battery with a new one.
Dimensional and product drawings
Please refer to Q/GDW 1356-2013 "Type Specification for Three phase Intelligent Energy Meters" for the size and product drawings of the following models.
Main terminal and functional terminal wiring diagram
Figure 3: Wiring diagram of main terminal and functional terminal
Note: The actual main wiring diagram and functional terminal wiring diagram shall be based on the meter end cover.
Precautions for use
During installation, the wiring terminals should be tightened and the meter should be securely hung on a sturdy, fire-resistant, and vibration resistant screen.
After wiring, the end cap should be sealed with lead, and it is recommended to seal the surface cap with lead.
When accessing RS485, it is recommended to use a three core shielded wire, which connects the terminal to meters A, B, and communication ground with three cores. The shielding layer should be reliably connected to the protective ground at one end.
When the external load exceeds the output capacity of the auxiliary terminal, an intermediate relay should be connected to prevent damage to the meter.
Transportation and storage
The meter should be stored in an environment with a temperature of -40 ℃ to 70 ℃ and a humidity of<85%, and should be placed in its original packaging with a stacking height of no more than 5 layers. Electric meters should not be stored after unpacking.
The transportation and unpacking of electric meters should not be subjected to severe impacts, and should be transported and stored in accordance with the provisions of GB/T13384-2008 "General Technical Conditions for Packaging of Mechanical and Electrical Products".
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