1 measurement functions
(a) has a positive active energy, reverse active energy measurement and storage of its data, forward power and reverse power measurement, the default combination of active energy for the absolute value of positive and negative power and the sum.
(b) with time measurement function, active energy according to the corresponding period of time were accumulated, stored total, sharp, peak, flat, valley energy.
2 Timing function
(a) The built-in hardware clock circuit with temperature compensation function is adopted, and the internal clock terminal output frequency is 1Hz.
(b) The clock has calendar, timing, leap year automatic conversion function.
(c) Using environmentally friendly lithium batteries as clock backup power; clock backup power in the life cycle of the energy meter without replacement, after power failure to maintain the internal clock correct working time totaled not less than 5 years; battery voltage is insufficient, the energy meter to give an alarm prompts.
(d) Through RS485, infrared and other communication interfaces, the energy meter can be calibrated, and the date and time can be set with safety measures to prevent unauthorized people from operating; except for broadcasting calibration, the calibration must be carried out in secret message.
(e) The power meter only accepts the clock error broadcast calibration of not more than 5 minutes; daily calibration is allowed once (the date change is allowed to calibrate), and should be avoided as much as possible in the power meter before and after the implementation of the settlement data transfer operation within 5 minutes.
(f) In the temperature range of -25～+60℃, the clock accuracy is ≤±1.0s/d; in the reference temperature (23℃), the clock accuracy is ≤±0.5s/d.
3 Rate, time period
(a) Support four rates: sharp, peak, flat and valley.
(b) There are two sets of rates and time slots that can be programmed arbitrarily, and another set of rates and time slots can be activated at a set point in time.
c) Each set of rate time slots can be set up for at least two time zones throughout the year; at least 12 time slots can be set up in a 24-hour period; the minimum interval between time slots is 15 minutes; and time slots can be set up across zero points.
d) Support the setting of special rate periods for public holidays and weekly rest days.
4. Meter Zeroing
a) Clear the data stored in the meter, such as electric energy, frozen quantity, event record, load record, and so on.
b) The zero clearing operation is permanently recorded as an event with safety measures to prevent unauthorized persons from operating.
c) The bottom value of the energy meter can only be cleared to zero and cannot be set.
5 Data storage
(a) Can store the last 12 settlement days of one-way or two-way total electric energy and each rate electric energy data.
(b) the moment of power failure misses the settlement moment, when the power can make up for the last 12 settlement of electrical energy data.
(c) in the case of power failure of the meter power supply, all the data related to the settlement of at least 10 years, and other data for at least 3 years.
6 Freezing function
a) Timed Freeze: Freeze electrical energy data at agreed times and intervals; each freeze volume is saved at least 60 times.
b) Instantaneous Freeze: Freeze the current calendar, time, all electric energy and important measurements under abnormal conditions; the instantaneous freeze volume is saved for the last 3 times.
c) Agreed Freeze: In case of conversion of the old and new sets of tariffs/time slots, conversion of step tariffs or when the power company deems there is a special need to do so, it freezes the amount of electric energy at the moment of conversion as well as other important data.
(d) Daily Freeze: Storing the electric energy at the zero moment of each day, which can store 62 days of data. If you miss the daily freeze at the moment of power outage, make up all the daily freeze data at the time of power up, and make up the freeze data of the last 7 days at most.
(e) Freeze at whole point: store the total active electric energy at whole point or half point, can store 254 data.
(f) The frozen content and corresponding data identification meet the requirements of DL/T 645-2007 and its filing documents.
7 Event Record
a) Permanently record the moment of occurrence of the zeroing event of the power meter and the electric energy data at the time of zeroing.
b) Record the total number of times of programming, the moment of the last 10 times of programming, the operator code, and the data identification of programming items.
(c) Record the total number of calibration times (excluding broadcast calibration), the moment of the last 10 calibrations, the operator code.
d) Record the total number of times of power-down, the moment of occurrence and end of the last 10 times of power-down.
e) Record the total number of times the last 10 pulling and the last 10 closing events, the moment of the pulling and closing events, the operator code, and the amount of electricity and other data.
f) Record the total number of times of opening the meter cover, the occurrence and ending moments of the last 10 times of opening the meter cover events and the electric energy data at the moment of the occurrence of opening the meter cover, during the blackout period, the meter only records the earliest time of opening the meter cover event.
8 Communication Function
8.1 485 communication
(a) The RS485 interface and the internal circuit of the power meter are electrically isolated and have failure protection circuit.
(b) RS485 interface meets the electrical requirements of DL/T 645-2007, and can withstand AC voltage 380V for 2 minutes without damage.
(c) RS485 interface communication rate can be set, the standard rate of 1200bps, 2400bps, 4800bps, 9600bps, the default value of 2400bps.
(d) RS485 interface communication follows DL/T 645-2007 protocol and its filing documents.
(e) The RS485 interface can be used for communication within 3s after the power-on completion of the energy meter.
f) RS485 interface can ensure normal communication in both positive and negative wiring on 485 bus.
8.2 Infrared communication
(a) With modulated or contact infrared interface.
(b) The electrical and mechanical properties of infrared interface should meet the requirements of DL/T 645-2007.
(c) Infrared effective communication distance ≥ 5 meters.
(d) The default communication rate of modulated infrared interface is 1200bps.
(e) Infrared communication follows the DL/T 645-2007 protocol and its filing documents.
f) Infrared authentication is required before infrared operation to open the operation authority.
8.3 Carrier communication
a) The power meter can be configured with narrowband or wideband carrier module.
(b) The communication between the power meter and the carrier module follows the DL/T 645-2007 protocol and its filing documents.
c) The default value of interface communication rate is 2400bps.
d) External plug-and-play type carrier communication module is adopted, and the carrier communication interface has failure protection circuit.
(e) During the carrier communication, the metering performance, stored metering data and parameters of the power meter are not affected or changed.
(f) Carrier communication can be carried out within 5s of powering up the energy meter.
8.4 Micropower wireless communication
a) The communication between the energy meter and the micropower communication module follows the DL/T 645-2007 protocol and its filing documents.
b) The default value of interface communication rate is 2400bps.
c) The external plug-and-play type micropower communication module is used, and the micropower communication interface has a failure protection circuit.
(d) The metering performance, stored metering data and parameters of the power meter are not affected or changed during the micro-power communication.
9 Signal output
9.1 Electrical energy pulse output
a) There shall be light pulse output and electric pulse output proportional to the measured electric energy (active/reactive).
(b) The light pulse output shall use ultra-bright, long-life LED devices.
c) The electrical pulse output shall be electrically isolated and can be collected from the front.
9.2 Multi-function signal output
(a) Multi-function signal output terminal can output time signal or time slot casting and cutting signal; 2 kinds of signals are set and converted by software; when the power meter is powered on for the first time, or when the power is cut off and then powered on again, the multi-function signal output is initialized as time signal output.
(b) The time signal is a second signal; the time period cut signal is a pulse signal.
(c) The time period cut signal is issued when the time period is changed, and the time period cut signal is still output even if the rate remains unchanged.
9.3 Control output
The energy meter can output electric pulse or level switch signal (the output mode can be set) to control external alarm device or load switch.
10 Display function
(a) The LCD starts backlighting when the energy meter is operated by key press or infrared communication in normal working state. After the backlight is triggered by pressing key or inserting card, the backlight will be turned off automatically after 60s without operation; when triggered by infrared, the backlight will be turned off after 2 automatic display cycles.
(b) The display content of the power meter is divided into three kinds: numerical value, code and symbol; the display content can be set through programming.
c) The power meter has the function of waking up the display after power failure.
(d) The meter is equipped with two display modes: automatic cycle and key press; the time interval of automatic cycle display can be set within 5～20s.
(e) with the power-on full display function, the energy meter in the power on 1 second after the LCD full screen display, LED lights all light (except pulse lights); backlight lit, LCD and LED lights, backlight lit time default 5s, the time interval can be set in 5 ~ 30s.
(f) the power meter has a communication command to make the power meter LCD screen full display and LED light full light function (except pulse light), LCD display and LED light maintenance time is 10s.
g) The meter can display the status of test key and official key through LCD.
h) It has an abnormal code display for card insertion operation, which is convenient for quickly analyzing and solving problems on site, and the abnormal code is shown in the following table.
CPU Card Insertion Abnormal Error Table
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Model
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Exception Display
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Categorization of issues
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error message character
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1
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ERR—31
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malfunction of electric meter
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1：Meter voltage is too low
2：Operation ESAM error
3: ESAM reset error (ESAM damaged or not installed)
|
|
2
|
ERR—32
|
invalid card
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4: Card reset error (card damage or unknown type of card, such as reverse card insertion, insertion of iron pieces, etc.)
5: Authentication error (successful communication but ciphertext does not match)
6: External authentication error (successful communication but authentication does not pass)
7: Unissued card (return 6B00 when reading card)
8: Card type error
9: card operation is not authorized (key status is not the public key when inserting parameters preset card)
10: MAC checksum error
|
|
3
|
ERR—33
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card and meter
mismatch
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11: Inconsistent table numbers
12: Inconsistent customer number
13: Inconsistent card serial numbers
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|
4
|
ERR—34
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Errors in the operation of electricity sales
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14: Card file format is not legal
15: Purchase of electricity card inserted into the unopened meter
16：Replacement card inserted into the unopened meter
17：Electricity purchase number of errors
18: User card write-back information file is not empty
|
|
5
|
ERR—35
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loose or defective contact (elec.)
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19: Operating card communication error
20: Early card removal
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|
6
|
ERR—36
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super-hoarder
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21: Surplus amount over hoarding
|
11 Fee control function
a) When the remaining amount is less than or equal to the set alarm amount, the power meter reminds the user by sound, light or other means, and the alarm reminder should be referred to (Appendix C of the Functional Specification of Intelligent Power Meter of Smart Power Meter Enterprise Standard Propagation Materials, Part IV); the overdraft amount is recorded in real time, and the power meter sends out the power failure signal to control the load switch to interrupt the power supply when the overdraft amount is less than the set overdraft threshold amount; when the power meter When the energy meter receives the valid renewed electricity charge information, it first deducts the overdraft amount, and when the remaining amount is greater than the set value (zero by default), the energy meter is put in the state of closing the gate or allowed to close the gate by remote or local means, and the power supply is resumed by manual local in the state of allowed to close the gate.
b) The maximum stored value of the remaining amount is determined by the number of digits displayed on the energy meter.
c) When the power supply line stops supplying electricity, the remaining amount and other information to be protected will not be lost.
d) The energy meter sets the parameters of the electricity consumption in the meter via solid state media
e) The amount of pre-stored electricity charges in the meter can be accurately iterated with the remaining amount in the meter.
f) After completing the pre-storage of the electricity charge, the energy meter can write back the remaining amount, the electricity consumption parameters of the energy meter and other information to the solid state media or transmit them back to the electricity sales system through the virtual media according to different charge control methods.
g) The meter does not accept the use of non-specified media to input information such as the amount of electricity purchased.
h) The meter can provide effective protection when using non-specified media or carrying out illegal operation; after the non-specified media or illegal operation is withdrawn, the meter can work normally without data loss.
