1. Purpose Characteristics and scope of adaptation

The DTSY/DSSY1791-D series plug-in universal three-phase fully electronic prepaid electric energy meter is a new type of instrument manufactured by our company using imported specialized large-scale integrated circuits, 16 bit A/D conversion, digital multipliers, digital sampling processing technology, and data acquisition, processing, and storage by a microcontroller processing system and SMT technology. Suitable for measuring the consumption of active energy in three-phase three wire or three-phase four wire AC power grids with a rated frequency of 50Hz or 60Hz. The product meets all technical requirements of GB/T17215.321-2008 "Level 1 and Level 2 Static AC Active Energy Meters" and GB/T 18460.3-2001 "IC Card Prepaid Electricity Sales System Part 3: Prepaid Energy Meters".

Main features:

1Apply computer management to purchase electricity before using it; Can be limited within the rated current rangeMaximum operating power (limited by the power supply department);

2The first time the card is inserted, there is power, and the second time the card is inserted, the power is retrieved to prevent the user's card from being stolen or lost.

3When the battery level is not retrieved or forgotten to be retrieved, the battery level will be automatically stored in the meter after the set time. As long as there is no user using the meter, the battery level can be retrieved at any time, up to a maximum storage capacity99Household.

4. Optional RF function, using non-contact card to enhance the service life of the card.

This meter is designed for fixed installation indoors and is suitable for environments with temperatures not exceeding -20 to+55 ℃, relative humidity not exceeding 85%, and free from corrosive gases in the air, as well as to avoid the influence of dust, mold, insects, etc.

2. Specifications, models, and technical indicators

2.1Specification and model

2.2Basic Error (Balance Load Error Limit)

Note: (Ib rated current Imax maximum current)

2.3start

Under the conditions of reference voltage, reference frequency, and COS φ=1.0, the instrument should be able to continuously measure electricity with a load current of 0.004Ib (level 1) and 0.005Ib (level 2).

2.4Stealth

When the rated voltage of the voltage circuit is 115% and there is no current in the current circuit, the test output of the instrument should not generate more than one pulse.

2.5Voltage range

Normal operating voltage: 0.9Un-1.1Un Extreme operating voltage: 0.8Un-1.15Un

2.6power waste

Voltage line power consumption: ≤ Power consumption of 2W and 10VA current lines: ≤ 4.0VA

3.working principle

3.1Working principle block diagram

The electric energy meter obtains voltage sampling signals from the voltage divider, current sampling signals from the current transformer, 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.

3.2data 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.

4.Installation and use

4.1 The electric energy meter can be installed and used after passing the inspection and being sealed with a lead seal before leaving the factory. Electric energy meters without lead seals or stored for too long should be re inspected by relevant departments before installation and use.

4.2 The electric energy meter should be installed in a ventilated and dry indoor area, and can be installed at any position. However, it is usually installed vertically, with a recommended installation height of about 1.8 meters. The base plate for installing the electric energy meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall.

4.3 In places with pollution and potential damage to the structure, the electric energy meter should be installed in a protective cabinet.

4.4 When installing wiring, follow the wiring diagram on the terminal knob cover of the electric energy meter or the corresponding wiring diagram in this manual. It is best to use copper connectors to prevent the electric energy meter from burning out due to poor contact.

When using an electric energy meter in areas with frequent lightning strikes, lightning protection measures should be taken to avoid damaging the meter due to lightning strikes.

4.6 The load capacity of the electric energy meter is between 0.05Ib~Imax (direct connection type) or 0.02Ib~Imax (through transformer connection type). Exceeding this load capacity will result in inaccurate measurement of the electric energy meter or burning of the current coil due to heating.

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

After installing the 4.8 table, use the settings card to set the table to the cost system table. Once successfully set up, the table belongs to the system and cannot be recognized by other systems.

After the successful setting of 4.9, the user can use the account opening card (on the authorized table). The first time the card is inserted, the battery level will automatically enter the table, and the battery level will be retrieved when the card is inserted again.

4.10 Power card function, retrieve the stored power and read it into the system. Perform final processing. (To be added)

4.11 Meter reading cards can read back the electricity in the meter, and each card can read the total electricity consumption of 248 meters. (To be added)

4.12 Use one meter with multiple cards: The IC card held by the user should be properly kept. If lost, the card will be replaced but the battery will not be replenished. The replacement card can be used to retrieve the battery.

4.13 The interval between each card insertion is 10 seconds. Less than 10 seconds, the electricity meter does not recognize. The RF card must display a success symbol before it can be removed to prevent battery loss.

4.14 Preparation for purchasing electricity: Users bring their cards directly to the computer management office to purchase electricity.

4.15 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 electricity, capacity limit method, and power limit into the IC card.

4.16 Electricity card usage: Insert the power purchase card into the card slot. If it is a valid power purchase card, the meter will automatically read the data into the meter. After waiting for a while, turn off the power switch and turn off the light to supply power. After use, please insert the card again to retrieve the battery and store it properly.

4.17 Operation Display: During the operation of the electric energy meter, the display screen displays information such as the remaining power, total electricity consumption, and meter constant in the meter.

Before operating the electricity meter, it is necessary to enter the system and record the meter number, meter constant, and other information for meter reading purposes.

4.19 The electricity meter should be loaded after it is fully closed, as direct loading will result in the lifespan of the relay.