DDSY866II Single phase electronic prepaid energy meter (Liquid Display)

Purpose, Characteristics, Functions, and Adaptability Range

The DDSY866 electronic single-phase prepaid energy meter (hereinafter referred to as the meter) uses microelectronics technology and ADE7755 to measure electrical energy. The electric meter that complies with the GB/T17215.321-2008 and GB/T18460-2001 standards adopts a fully shielded and fully sealed structure, and uses an advanced single-chip processing system for data acquisition, processing, and storage. It has good characteristics such as electromagnetic interference, low power consumption, high precision, anti-theft, high overload, and long life.

Main function: Apply computer management to purchase electricity before using it; The maximum operating power can be limited within the rated current range (limited by the power supply department); One meter, one card, dedicated card, no power loss after card loss, can be used after card replacement; Electric cards can transmit data bidirectionally; Can automatically power off and alert users to purchase electricity; When the battery level is zero, the power will automatically trip and cut off; And it has certain anti-theft software design, etc.

The DDSY866 series electronic energy meter is suitable for measuring active energy with a frequency of 50Hz or 60Hz, and is installed in indoor or outdoor meter boxes for use. Suitable for environments with temperatures ranging from -30 to+70 ℃, relative humidity not exceeding 85%, and no corrosive gases in the surrounding air to avoid the effects of dust, salt spray, condensation, etc.

Specifications and main technical parameters

1. Specifications

2. Basic error

Note: Ib is the calibration current, and Imax is the rated maximum current.

3. Starting current: Under rated voltage, rated frequency, and power conditions, the first level meter is 0.004Ib and the second level meter is 0.005Ib, and the meter can operate normally.

4. Submersion: When there is no current in the circuit of the electric meter and the voltage applied to the circuit is 115% of the rated value, the output pulse should not exceed one.

5. Power consumption: ≤ 2W, 5VA

Main structure and working principle

1. Main structure

Adopting flame-retardant ABS shell, it is sturdy, sealed, and has good shielding performance.

2. Working principle diagram

The electric energy meter obtains voltage sampling signals from the voltage divider, current sampling signals from the current divider, voltage current product signals from the multiplier, and then generates a counting pulse with frequency proportional to the product of voltage and current through frequency conversion.

3. Data processing

The electric energy metering pulse is sent to the CPU for processing through a photoelectric coupler, and after calculation, it is stored in a non-volatile EEPROM. The information system is managed by a computer, and through an IC card reader/writer, a certain amount of electricity and monitoring requirements are written into the IC card input table of the microprocessor system. After being processed by the CPU, it provides display, alarm, and cut-off status signals.

Installation and Usage

• 1. The electric meter is inspected and qualified before leaving the factory, and sealed with a lead seal. It needs to be installed and used. If there is no lead seal or it has been stored for too long, relevant departments should be asked to recheck and seal it before installation and use.

• 2. The electric meter should be installed in a dry and ventilated place, and the bottom plate for installing the electric meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall. The height of the electric meter is about 1.8 meters.

• 3. Connect the wires according to the circuit diagram, tighten the wiring screws, and secure the connecting plate inside the terminal box.

• 4. The reading of an electric meter connected through a transformer must be multiplied by the transformation ratio to obtain the actual amount of electrical energy.

• 5. One table, one card: The IC card held by the user cannot be exchanged. In case of loss, a replacement card should be purchased from the power supply department (sales office).

• 6. Preparation for purchasing electricity: Before purchasing electricity, the user must insert the IC card into the card slot once to facilitate the return of the meter to the computer database.

• 7. Electricity purchase method: When selling electricity, insert the IC card into the IC card reader and operate the computer to encrypt the user ID, pre purchased power, alarm power, capacity limiting method, and capacity limiting power into the IC card.

• 8. Electricity card usage: Insert the power purchase card into the card slot. If it is a valid power purchase card, the electricity meter will automatically read the data into the meter. The LCD display screen will show the following information in sequence: purchased electricity amount, total purchased electricity amount, number of electricity meter readings, alarm electricity amount, credit limit, and limited capacity power. Please store the unplugged card properly.

• 9. Operation display: During the operation of the electricity meter, it alternately displays the remaining electricity and total electricity consumption in the meter.

• 10. Overcapacity alarm: During the operation of the electricity meter, if the "alarm indicator light" flashes, it warns the user that the electricity has been exceeded. If the meter is set to the over capacity power-off limit mode, after 30 seconds of over capacity power consumption, it will be tripped for 3 minutes and the countdown display (180 seconds) will show the time to restore power supply; If the user inserts the card and responds, the power supply can be immediately restored.

• 11. Accumulation limit: If the purchased electricity+remaining electricity exceeds the accumulation limit (1000kWh), the purchased electricity will not be read in, and the display will show a "remaining limit" prompt, indicating that the stored electricity in the card is still valid.

• 12. Warning reminder: When the remaining battery level in the meter is less than twice the "alarm battery level", the "alarm indicator light" will flash (with an interval of 1 second) to remind the user to purchase electricity. At this time, if the user responds by inserting a card, the "alarm indicator light" will flash at an interval of 2 seconds to avoid power outage warnings.

• 13. Power outage warning: If the user does not respond by inserting the card during the warning reminder, when the remaining power is the user's agreed alarm power (or 10% of the purchased power), the electricity meter will turn off the power warning and display a "turn off" prompt. At this time, inserting the IC card into the card slot once will restore power supply. If the IC card of this meter cannot be found after pulling the switch, you can borrow a neighbor's IC card to insert it and restore power supply.

• 14. Power purchase reminder: When the remaining power in the meter is less than the "alarm power", the "alarm indicator light" will remain on as a constant reminder.

• 15. Fault declaration: When the remaining power is displayed as zero or negative, a "trip" prompt will be displayed. If the meter continues to operate, the user should immediately purchase electricity and proactively report the situation to the power supply department.

Outline drawing and wiring diagram

(For reference only, subject to actual conditions)