1、 Overview

DDSYF1791 single-phase electronic remote prepaid energy meter (hereinafter referred to as "instrument") is designed and manufactured based on the actual electricity consumption of residents. It has high accuracy and reliability.

This instrument adopts advanced energy metering dedicated chips, designed in combination with mature multi rate and prepaid technologies, and is a high-tech product manufactured using 16 bit digital sampling processing technology and SMT process. The key components are selected from internationally renowned long-life devices, which improves the reliability and service life of the product. The data display adopts a large screen LCD, which is convenient for meter reading.

This instrument can realize functions such as time-sharing metering prepayment, setting daily meter reading, handheld computer programming, and meter reading; Can be set2A time zone,4Fee rate,12Daily time period; And it has infrared and485Communication function, capable of remote meter reading, communication protocol can supportDL/T 645-2007The Communication Protocol for Multi functional Energy Meters provides essential conditions for the automation management of electricity consumption.

Its performance indicators comply with the technical requirements for electronic active energy meters in GB/T 17215.321-2008 "Static AC Active Energy Meters for Class 1 and Class 2", meet the technical requirements for multi rate energy meters in GB/T15284-2002 "Special Requirements for Multi rate Energy Meters", and comply with various technical requirements of GB/T18460-2001 "IC Card Prepaid Electricity Sales System".

2、 Main functions

Remote prepaid energy meters have the following basic functions:

2.1 Time division active positive and negative energy metering, which can be divided into 4 rates, 12 time periods, and 2 time zones.

2.2 With staircase function, up to 4 staircases can be set, and the electricity quantity and price of each staircase can be set separately.

2.3 Infrared communication, programming settings, and meter reading can be performed through a handheld computer.

2.4 It can achieve parameter rotation display, and the parameters (no more than 32 items) and time intervals of the rotation display can be pre-set. The order of parameter rotation display can also be set arbitrarily.

2.5 Equipped with optocoupler isolation active passive pulse output interface, with the same pulse constant as the meter constant.

2.6 Record the total active power and hourly power for 12 months, and meter reading can be done through infrared or 485 methods.

2.7 It has programming prohibition function and data reset function.

2.8 Support for reduced meter reading according to departmental regulations.

2.9 It has the function of purchasing electricity first and then using it, and automatically freezing the monthly electricity consumption rates on designated meter reading days.

2.10 IC card can be used for parameter setting and meter reading.

2.11 adopts a one meter one card method, with multiple verifications and encryption of data in the IC card, ensuring security and reliability.

2.12 Each time electricity is purchased, data is transmitted bidirectionally through the power card.

2.13 Can set non working hours and emergency credit limits.

2.14 Within the rated current range, the maximum operating power can be limited (by the power supply department).

2.15 has an external alarm output interface.

3.16 has built-in sound and light alarm, trip and power-off functions

a. When overloaded, it is possible to control the output of alarm and trip signals by selecting whether to allow alarm tripping.

b. When the remaining power is less than or equal to the alarm set value, the alarm and trip signals can be controlled by selecting whether the meter is allowed to output alarm and trip signals.

c. When the remaining power is zero, the meter outputs a trip signal.

3.15 has the functions of remote meter reading, remote opening and closing, and remote electricity sales.

3、 Working principle

When the electric energy meter is working, the voltage and current are sampled separately by the sampling circuit, and then multiplied by a dedicated integrated circuit for electric energy processing before being sent to the CPU for processing. Finally, the CPU sends the processed data to output devices such as the display and communication parts as needed.

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.

The working principle of the instrument is shown in Figure 1.

4、 Technical indicators

4.1 Accuracy Level Active 1.0 2.0 Level

4.2 Reference voltage 220V

4.3 Rated current 1.5 (6) A, 2.5 (10), 5 (20) A, 10 (40) A, 15 (60) A, 20 (80) A

4.4 Rated frequency 50Hz

4.5 Starting current level 1: ≤ 0.004In

Level 2: ≤ 0.005In

4.6 Stealth with anti creep logic design

4.7 External dimensions 168mm × 110mm × 61mm

4.8 Weight approximately 1 kg