1. Purpose Characteristics and scope of adaptation

This series of three-phase electronic prepaid energy meters (hereinafter referred to as meters) comply with GB/T17215.321-2008 and JB/T18460.3-2001 standards, and use advanced microcontroller processing systems for data acquisition, processing, and storage. Its purpose is to measure three-phase active electrical energy with a rated frequency of 50Hz.

Main features: Application of computer management, purchasing electricity first and then using electricity: maximum power consumption can be limited within the rated current range (limited by the power supply department): one meter with multiple cards, one card with multiple meters, loss of card and power, cannot be replenished and reused, multiple user meters are in the same area; Electric cards can transmit data bidirectionally; After use, it can automatically cut off power for 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.

This meter is suitable for ambient temperatures ranging from -25 ℃ to+55 ℃ and relative humidity not exceeding 85.

2. Specifications, models, and technical indicators

2.1 Specification and Model

Model accuracy level Reference voltage Un Rated current Ib Connection method Instrument constant

imp/kWh

DTSY1332

DSSY1332 Level 1 or 2 3X220/380

3X57.7/100 1.56 mutual inductance type 1600

1040 Direct 400

1560 direct formula 400

2080 Direct 200

2.2 Basic Error (Balance Load Error Limit)

Basic error of current value power factor (COS φ)

Directly connect the instrument through the transformer instrument 1 2

0.05Ib≦I<0.1Ib 0.02Ib≦I<0.05In 1±1.5±2.5

0.1Ib≦I<Imax 0.05In≦I<Imax 1±1.0±2.0

0.1Ib ≤ I<0.2Ib 0.05In ≤ I<0.1In 0.5 (inductive)

0.8 (capacitive) ± 1.5 ± 2.5

0.2Ib ≤ I<Imax 0.1In ≤ I<Imax 0.5 (inductive)

0.8 (capacitive) ± 1.0 ± 2.0

Note: (Ib rated current Imax maximum current)

2.3 Start up

Under the conditions of reference voltage, reference frequency, and COS φ=1.0, instruments with load currents of 0.004Ib1 and 0.005Ib2 should be able to continuously measure electricity.

2.4 Submersion

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.

2.5 Voltage Range

Normal operating voltage: 0.9Un-1.1Un

Maximum operating voltage: 0.8Un-1.15Un

2.6 Power consumption

Voltage line power consumption: ≤ 2W and 10VA

Current line power consumption: ≤ 4.0VA

3. Main structure and working principle

This series of three-phase electronic prepaid energy meters is a new type of instrument manufactured using imported specialized large-scale integrated circuits, 16 bit A/D conversion, digital multipliers, digital sampling processing technology, and SMT process.

3.1 Working principle 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 a frequency proportional to the product of voltage and current through frequency conversion. Through frequency division, it drives the stepper motor to measure electricity.

Electric energy signal

relay

Power Supply System of Power Supply Bureau

C P U

Data storage circuit

LCD display system

Electricity input and output

electric card

3.2 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.

4. Installation and use

4.1 The electric meter shall be inspected and qualified before leaving the factory, and sealed with a lead seal before installation and use. If there is no lead seal or it has been stored for too long, relevant departments should be asked to re verify and seal it before installation and use.

4.2 The electric meter should be installed vertically and not tilted in a dry and ventilated place. The bottom plate for installing the electric meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall, with a height of about 1.8 meters.

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

The red window on the electricity meter nameplate represents decimals, and the black window represents integers. 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.

Before purchasing electricity, users can directly purchase electricity.

4.6 When selling electricity, insert the power card into the card reader/writer and operate the computer to encrypt the user code, pre ordered power, capacity limit method, and limited power into the power card.

When using 4.7, insert the power card into the card holder. If it is a valid card, the meter will automatically read the data into the meter. The data tube will display the original remaining power in the meter (3 seconds) and the total power after stacking (12 seconds). Then, remove the card and store it properly.

During the operation of the electricity meter, if the user needs to know the remaining power in the meter at that time, they only need to plug in the power card to display it.

During the operation of the electricity meter, if the display flashes to show the remaining power and the over capacity indicator light is on, it will warn the user that the electricity has been used beyond the capacity. If the user is set to the over capacity power-off and capacity limit mode (with the capacity limit indicator light on), the remaining power will flash for 30 seconds, then the switch will be turned off for 3 minutes, and the countdown will display the time to restore power supply in seconds; If the user inserts the card and responds, the power supply can be immediately restored.

4.10 If there is a power overflow (purchased power+remaining power>10000kWh), the purchased power will not be read in, and the display will only show P0=F (3 seconds) and the original remaining power (12 seconds), while the power in the card is still valid.

4.11 If a user holds multiple electricity cards corresponding to one meter, they should purchase another card from the power supply department (sales office) when lost.

4.12 If the remaining power is displayed as zero and the meter continues to operate while the overdraft indicator light is on, the user should immediately purchase electricity and proactively report the situation to the power supply department.

5. External dimensions

6. Functional terminal wiring

+-

Active pulse

Impulse output

①②③④⑤⑥⑦⑧⑨⑩

Pull gate control

Normally closed and normally open contacts