1Product Introduction

KDThe multi-user energy meter adopts advanced application specific integrated circuit design and fully automatic surface mount（SMT）Manufacturing process ensures long-term stable operation of the entire machine, with advanced technological features such as high precision, high overload, low power consumption, and high reliability.

Direct access electric energy meter, accuracy:1Grade, implementing standard GB/T17215.301-2007《Multi function watt hour meter special requirements》TheJB/T10451-2004《Multi user static AC active energy meter special requirements》Verification basis:JJG 596-2012《Verification Regulations for Electronic AC Energy Meters》. Product * * Large user quantity: Single phase36Household or three-phase12Within the range of large outgoing lines of the electricity meter, the number of three-phase users can be set arbitrarily, while the remaining outgoing lines are used by single-phase users.

External transformer type electric meter, accuracy:0.5SGrade, implementing standard GB/T17215.301-2007《Multi function watt hour meter special requirements》Verification basis:JJG 596-2012《Verification Regulations for Electronic AC Energy Meters》. Product * * Large user quantity: Three phase8Household.

The electric meter hasRS485Communication interface, usableRS485The bus connects the mobile game electricity meter and the upper computer to form a dedicated network or for local useRS485Bus structure, through telephone lines, fiber opticsGPRSWireless communication with the upper computer and the use of RF card power sales query device for local connectionRS485The internet. After networking in different ways, using the upper computer and corresponding management software, data communication with the electricity meter or data transmission through RF cards can be achieved to retrieve and control electricity sales or user electricity consumption information.

1Working principle and composition

The electric meter obtains voltage sampling signals from voltage transformers and current sampling signals from current transformers. After passing through a dedicated energy metering chip, the voltage and current signals are obtainedCPUProcess and display on the LCD screen.

CPURead energy pulses from a dedicated energy metering chip, perform calculations, and store them in memory. Managed by a computer information system, through485Communication, writing a certain amount of power and monitoring requirements, inputting into the microprocessor system in the table, throughCPUAfter calculation, provide display and other functions.

2Specification and model

3Introduction to functions and features:

1Functional features:

◆ Prepaid function, users purchase electricity first and then use it, and power off if overdue.

◆ Overload protection function, when the user's load exceeds * * large load, the user will automatically power off for protection.

◆ Power off automatic recovery function. After the user loses power protection, within the specified number of power outages, if the user's maximum power drops to within the allowable range, the system will automatically restore power supply.

◆ Low battery alarm function, which can set the alarm battery level. When the user's electricity consumption is below the set value, it can provide a power-off prompt to the user. The user can swipe their card to restore power supply. (485 network networking mode can set automatic power restoration time)

◆ Allow overdraft power function, different overdraft power can be set according to user reputation, and power will be cut off if overdue fees exceed the set parameters.

◆ Set tiered power and tiered unit price function: Two sets of tiered parameters can be set, each set can be divided into multiple stages (* * 8 more), corresponding to the set unit price; The electricity meter has the function of saving electricity usage records, which can save the electricity usage history of the past 6 months (including the current month);

2. Technical features:

The electric meter adopts an original imported processor, which has low power consumption, high integration, fast operation speed, stability, and reliability

The volume of the watch box is smaller, and the internal wiring is neat and orderly.

The power supply adopts an iron sheet transformer, which reduces the electromagnetic interference of the power supply on weak current circuits.

Add relay detection function inside the electric meter, which can detect the status of the relay online through software. The software can judge the quality of the relay by itself.

The electric meter has a phase loss protection function. For three-phase users, if there is a phase loss caused by power supply phase loss or relay failure, it can automatically perform phase loss protection to ensure the * * operation of the user's three-phase equipment.

The incoming and outgoing lines of the electric meter use dedicated wiring terminals, which have stronger current carrying capacity and are more convenient for on-site construction;

◆Single-phase electric meter36Household or36Any combination of single and three-phase below the household level, set the number of householdsEasy to operate, set the number of single and three-phase users directly through software, which can be changed at any time without dismantling the meter or returning to the factory, as long as sufficient outgoing lines are ensured.

The pulse and communication interfaces of the electric meter use dedicated wiring terminals to avoid the problem of missing or lost accessories, which is more in line with the needs of engineering installation.

The electric meter communication has lightning protection circuits and uses independent modules, greatly reducing the damage caused by lightning strikes to the electric meter.

The electric meter drive circuit adopts a dedicated chip, with a simple circuit, few fault points, strong anti-interference ability, and more reliable operation;

The current transformer in the electric meter adopts a dedicated transformer board, which is installed by welding and placed at the front end of the meter; Reliable connection, disconnected from copper bars and relay contacts, to prevent the possibility of contact heating and burning the transformer.

The electricity meter adopts the standard DL+T+645-2007 communication protocol, which is open and compatible, making cooperation with system integrators more convenient;

The electricity meter can achieve one card function with single-phase electricity meters and water meters of the same series;

IIMain technical parameters

1Direct access electric energy meter

Rated voltage:AC～3x220/380V；

Accuracy level:Level 1;

Calibration current5 (40) A, 15 (60) A, 20 (80) A;

Pulse constant:900imp/kWh； 20（80）A-400 imp/kWh；

Electricity division:0.01 degrees;

Working temperature range:-25℃～+55℃

2. External transformer type electric meter

Rated voltage:AC～3x220/380V；

Accuracy level:0.5S level;

Calibration current1.5（6）A；

Pulse constant:5000imp/kWh；

Electricity division:0.01 degrees;

Working temperature range:-25℃～+55℃

3、 Electric meter appearance and installation dimensions

1. Appearance and installation dimensions of direct access control type electric meters

2. Transformer remote control electric meter appearance and installation dimensions

4、 Connection of electricity meter power line, outlet line, and control line

1. Direct access electricity meter

The power supply incoming line is a three-phase four wire system, with the live line serving as the common line for electricity meter users and allocated to the power supply outgoing line within the meter. The neutral line is only provided for the meter itself, and the user's neutral line needs to be provided to the user outside the meter through the neutral line busbar.

◎ Electricity meter power supply connection

The electricity meter is connected to the power supply using dedicated wiring terminals, and the live wire end connected is made of copper terminal block, allowing for a large cross-section of the terminal block6×25（150mm2）, usingM8 screws for fixation, multi-core copper wire for neutral wire, stripped 15mm at the end, directly crimped, with a cross-sectional area of not less than 2.5mm2As shown in the picture2

◎ Electricity meter user household wiring:

The electricity meter is connected to only one live wire+For users who enter the household with neutral or three-phase four wire system, the user outgoing line of the electric meter is the phase line (live line), which is generally connected to the terminal block. The user's neutral line is centrally connected to the neutral terminal block of the distribution box. When the electric meter is set with three-phase users, the three-phase users occupy the lower numbered outgoing line. For example, when setting up one three-phase user, the user occupies 1/2/3 of the line, when setting up two three-phase users, the second three-phase user occupies 4/5/6 of the line, and the rest is occupied by single-phase users. Figure 3 shows a pure single-phase user connection, while Figure 4 shows a mixed single-phase and three-phase user connection.

Principle of three-phase user occupancy line:

Low numbered outgoing lines are taken from the three adjacent power sources of the starting line, which are the three phases of the input power supply;

Starting line numberX， Satisfy: (X-1)/3, remainder is 0, such as: 1, 4, 7, 10

2. Transformer type electric meter

The user output of transformer type electric meters is rated currentIn=5A industrial transformer secondary output line, recommended wire cross-section is 2.5 mm2Multi core copper wire. For three-phase users, three industrial transformers must be used, and the wire connections must be reliable to prevent secondary open circuits in the transformers.

◎ Remote control meter wiring for transformers (Figure 5)

The relay of a transformer controlled electric meter does not directly control the user's load line like a directly connected electric meter. Instead, it provides the user with an auxiliary switch (or a set of switches) that can be connected to other control circuits and use other high-power switches to achieve load control or alarm reporting. The capacity of the relay switch inside the electricity meter is:AC250V/5A.

5、 RS485 communication

Electricity meter providedRS485Communication interface, using dedicated communication twisted pair cables to connect the electricity meter to the network, and realizing the reading and control of electricity meter parameters through the upper computer.

formRS485When communicating in a network, bus or star radiation methods are generally used. When connecting in bus mode, it is recommended to use the diagram6way;map7When connecting, twoTThe distance between the shape points should be greater than1Meter, branch wire length less than10cmWhen using the star connection method, please refer to the figure8When the communication distance is far or the communication quality is poor during testing, parallel connection should be made at the far end (terminal) of the bus120ΩLoad resistance matching to prevent echo oscillation and reduce communication quality.

In general, when using dedicated twisted pair cables, the communication speed is lower than9600bpsReliable communication over long distances1200When the communication speed decreases, the communication distance increases, depending on the site conditions.

6、 Accessories