Single Phase Smart Prepayment Keypad Electricity Meter
Type: DDSY1311
The single-phase smart prepaid meter integrates keyboard, relay, energy measurement, communication, time-of-use pricing, monthly settlement, daily freezing, load curve, event logging, load control, prepayment, and optical alarm functions. Equipped with a high-precision metering unit and a high-speed MCU, the meter ensures accurate measurement and rapid data processing.
description
It features built-in relay control, bypass function, and anti-theft mechanisms such as tamper detection. Operating on an STS “pay first, use later” model, it ensures secure recharge management through encrypted token codes. Basic operations can also be performed via short codes, offering convenient and user-friendly operation.
| Item | Sub-item | Parameters |
| Basic Parameter | Meter Type | Single-Phase Dual-Circuit Meter |
| Active Energy Accuracy Class | Class 1.0 (IEC 62053-21) | |
| Reactive Energy Accuracy Class | Class 2.0 (IEC 62053-23) | |
| Rated Voltage | Rated Voltage Un: 240VOperating Voltage Range: 0.6Un ~ 1.15Un | |
| Grid Frequency | 50Hz | |
| Current Range | 5(1000)A | |
| Starting Current | 4‰Ib | |
| Pulse Constant | 1600imp/kWh, 1600imp/kvarh | |
| Power Consumption | Current circuit apparent power consumption < 0.5VA; Voltage circuit active power consumption < 2.0W, apparent power consumption < 10VA | |
| Temperature | Operating Temperature: -25°C ~ +55°C Storage Temperature: -40°C ~ +70°C | |
| Compliance Standards | IEC62052-11 and IEC62053-21 | |
| Communication Ports | / | 1 x Optical Communication Port: 300bps to 9600bps 1 x RS485 Communication Port: 19200bps 1 x Communication Module (G3/RF) Interface 1 x Built-in Bluetooth Communication Module |
| Communication | Communication Protocol | Optical: IEC62056-21 mode E RS485: DLMS HDLC PLC/RF: DLMS HDLC BLUETOOTH: DLMS HDLC |
| Metering | Energy Quantity | – Total active energy (15.8.0) total and by tariff – Forward active energy (1.8.0) total and by tariff – Reverse active energy (2.8.0) total and by tariff – Forward reactive energy (3.8.0) total and by tariff – Reverse reactive energy (4.8.0) total and by tariff – Forward apparent energy (9.8.0) total and by tariff – Reverse apparent energy (10.8.0) total and by tariff – Quadrant I reactive energy (5.8.0) total and by tariff – Quadrant II reactive energy (6.8.0) total and by tariff – Quadrant III reactive energy (7.8.0) total and by tariff – Quadrant IV reactive energy (8.8.0) total and by tariff |
| Instantaneous Values | – Voltage- Current (L/N) – Active Power (L/N) – Reactive Power (L/N) – Apparent Power (L/N) – Power Factor (L/N) – Grid Frequency | |
| LED & LCD Display | LED Indicators | 4 LEDs from left to right: – Active Pulse Indicator, Red – Event Alarm Indicator, Red – Balance Indicator, Red/Green Dual-Color- Reactive Pulse Indicator, Red |
| Display Digits | – Energy display: 8+0/7+1/6+2/5+3 configurable; – Power: 0,1,2,3,4 decimal places configurable; – Demand: 0,1,2,3 decimal places configurable; – Voltage: 1 decimal place; – Current: 3 decimal places; – Frequency: 0 decimal place; – Power Factor: 3 decimal places | |
| Display Modes | – Keypad scroll display- Auto scroll display- Power-off display- Keypad short code query display | |
| Display Duration | – Scroll display time: 1s~99s configurable; – Keypad page-turning display: 1s~99s configurable; – Power-off display: 30s; – Short code query display: 15s | |
| Backlight | Lights up during keypad page-turning, duration same as keypad page-turning display time.Lights up for 15s during short code query | |
| Display Content | See 【4.2.2 Display Module】 for details | |
| TOU | Time-of-Use Tariff | – 8 tariffs – 12 daily time-of-use tables – 10 daily tables – 12 weekly tables – 10 seasonal tables – 100 holidays |
| RTC | Clock Accuracy | ≤0.5s/day (23°C) |
| Battery | Super capacitor + external replaceable battery, battery service life 10 years | |
| Load Profile | Energy Load Profile Recording | Load interval: 1,5,10,15,30,60 minutes configurable Storage capacity: At least 12960 records based on 16 captured objects Selective access: by range and by entry; Sorted method: Smallest; Captured objects: See 4.2.6.1 Energy Load Profile for details |
| Power Quality Load Profile Recording | Load interval: 1,5,10,15,30,60 minutes configurable Storage capacity: At least 12960 records based on 16 captured objects Selective access: by range and by entry; Sorted method: Smallest; Captured objects: See 4.2.6.2 Power Quality Load Profile for details | |
| Billing | Monthly Billing | Storage capacity: Stores the latest 14 monthly billing records;Billing methods: 1) Auto billing 2) Billing via communication command 3) Auto settlement when switching between two sets of tariff tables 4) Billing t when switching meter operating modes Selective access: by range and by entry. Sorted method: unsorted (FIFO). Billing content: See 4.2.7.1 Monthly Billing for details |
| Daily Freezing | Storage capacity: At least 93 days of data; Settlement method: Auto settlement at 00:00:00; Selective access: by range and by entry. Sorted method: Smallest. Settlement content: See 4.2.7.2 Daily Freezing for details | |
| Demand | Current Maximum Demand | Demand interval:- 300 seconds- 600 seconds- 900 seconds- 1200 seconds- 1800 seconds- 3600 secondsDemand calculation method: Block or sliding, number of sliding intervals 1~15 configurable, the demand interval must be an integer multiple of the number of sliding intervals (sliding interval = demand interval / number of sliding intervals) |
| Event | Event Logs | Standard Event Log; Fraud Event Log; Disconnector Control Event Log; Power Failure Event Log; Communication Event Log; Power Quality Event Log; Recharge Event Log; Manage Token Event Log; Voltage Fluctuation Event Log; Short Power Fail Event Log; Long Power Fail Event Log; Configuration Event Log |
| Security | Communication Security | Suit0 |
| Remote Upgrade | Remote Upgrade | Supports local upgrade and remote upgrade |
| Prepayment | Recharge Methods | Keypad recharge, remote communication recharge |
| Balance Alarm | Remaining energy alarm value configurable, 3-level alarm thresholds | |
| Energy Hoarding Prevention | If the sum of user’s recharged energy and remaining energy exceeds the preset hoarding prevention value, the meter will prompt over-limit, recharge will fail, and the recharge token can be recharged when the hoarding prevention condition is not met | |
| Emergency Overdraft | Overdraft energy configurable, after power-off due to insufficient balance, overdraft can be activated via short code 811, power-off when overdraft energy is exhausted | |
| Preset Energy | Energy pre-provided to users before account opening and recharge after factory installation, will be deducted at the first recharge | |
| Friendly Mode | Meter will not power off when balance is insufficient during friendly period, will power off after exiting friendly period, will close the switch when entering friendly period, time period can be programmed Night period: 00:00~23:00 daily Weekend period: Monday~Sunday Fixed holidays and special holidays: Maximum 50 holidays in total | |
| Meter Operating Mode | Optional 2 modes: 1. Prepayment mode (charge by energy, charge by money, tiered tariff, mixed tiered tariff) 2. Postpaid mode | |
| Mechanical Specifications | Protection Level | Indoor IP54 |
| Seals | 2 module box seals2 meter cover seals1 terminal cover seal | |
| Meter Case Material | Polycarbonate | |
| Terminal Specification | BS Standard | |
| Dimensions (L×W×H) | 220mm × 125mm × 75.5mm | |
| Weight | Approx. 910g |
