1、 Overview

The DDS1791 single-phase electronic energy meter adopts the single-phase energy metering chip ADE7755 from ADI in the United States and advanced SMT and wave soldering processes. It is a new type of instrument designed and manufactured according to the actual electricity consumption of users. All technical indicators of this instrument comply with the requirements of GB/T17215.321-2008 Static AC Active Energy Meter and IEC62053-21 international standard.

2、 Function and Features

1. It has the function of bidirectional measurement of active energy, with LCD display or meter displaying the total amount of electricity;

2Equipped with infrared communication andRS-485 communication interface (optional), which allows for remote and convenient meter reading and switching management of electric energy meters;

3. Can set or retrieve parameters such as total power consumption, instrument constant, meter address, meter password, etc;

4. The CPU chip has a watchdog system inside, which makes data more secure and reliable, and data during power outages can be stored for a long time (continuous power outages can be stored for more than 10 years);

5. The isolated power supplies provide reliable working power for the CPU, metering section, and RS485 interface.

6. Communication protocol

According to the "Multi function watt hour meter communication protocol" DL/T 645-2007 Chinese power industry standard.

3、 Specifications and main technical parameters

1. Model specifications

2. Basic error limit

Note: Ib calibration current, Imax maximum current.

3. Start up

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) or 0.005Ib (level 2).

4. Stealth

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

5. Voltage range

Normal operating voltage: 0.9Un-1.1Un

Maximum operating voltage: 0-1.15Un

6. Power consumption

Voltage line ≤ 2W and 10VA

Current line ≤ 0.6VA

7. Climatic conditions

Normal operating temperature: -10℃ +45℃

Extreme working temperature: -25℃ +55℃

Storage and transportation temperature:- 25℃ +70℃

8. Weight: 0.8kg

9. Dimensions: 168mm × 108mm × 58mm