1.1 Overview

The DTSD/DSSD1791 electronic three-phase intelligent energy meter is a modern and advanced instrument designed and manufactured using large-scale integrated circuits, digital sampling processing technology, and SMT technology, based on the actual electricity consumption of industrial users.

The performance indicators of this meter comply with the technical requirements of GB/T 17215.323-2008 "Special Requirements for AC Measuring Equipment Part 23: Static Reactive Energy Meters (Level 2 and Level 3)", GB/T 17215.321-2008 "Special Requirements for AC Measuring Equipment Part 21: Static Active Energy Meters (Level 1 and Level 2)", GB/T 17215.301-2007 "Special Requirements for Multifunctional Energy Meters", DL/T 614-2007 "Multifunctional Energy Meters", Q/GDW 362-2009 "Technical Specification for Level 1 Three phase Cost Control Intelligent Energy Meters" and Q/GDW 363-2009 "Technical Specification for Level 1 Three phase Intelligent Energy Meters" for multifunctional energy meters. Its communication complies with the requirements of DL/T 645-2007 "Multifunctional Table Communication Protocol".

This meter can measure active and reactive power and demand in various directions, and measure active and reactive power in phases. It has dual RS485 and modulated infrared communication, buttons, and infrared power outage wake-up meter reading functions. It has stable performance, high accuracy, and easy operation.

1.2 Working principle

A three-phase intelligent energy meter is composed of a measuring unit and a data processing unit. In addition to measuring active (reactive) energy, it also has two or more functions such as time-sharing and measuring demand, and can display, store, and output data.

The working principle of DTSD1791 electronic three-phase intelligent energy meter is shown in Figure 1:

Figure 1 Working principle block diagram of three-phase intelligent energy meter

When the electric energy meter is working, the voltage and current are sampled separately by the sampling circuit and sent to the amplification circuit for buffering and amplification. Then, they are converted into digital signals by the metering chip, and the high-performance microcontroller is responsible for analyzing and processing the data. Due to the use of high-precision measurement chips, the measurement chip completes high-speed front-end sampling on its own, and the measurement algorithm is stable. The microcontroller only needs to manage and control the working status of the measurement chip. The microcontroller in the figure is also used for time-sharing billing and processing various input and output data, and completes time-sharing active and reactive energy metering and maximum demand metering functions according to pre-set time periods. It displays various data as needed, communicates and transmits through infrared or 485 interfaces, monitors operating parameters, records and stores various data.

1.3 Technical indicators

Accuracy level Active power level 0.2S, 0.5S, 1 reactive power level 2

Rated frequency 50Hz

Starting current Merit 0.001I_n(0.2S level, 0.5S level); zero point zero zero twoI_n(Direct entry 0.004)I_n）(Level 1.0)

Reactive power 0.003I_n(Straight in 0.005)I_n）(Level 2.0)

Stealth Designed with anti creep logic

External dimensions 265mm´170mm´75mm

weight About 2.5kg

Electrical parameters

Multiple rate work parameters

climatic conditions