DDS228 Single-phase electronic energy meter (Meter display)

Overview

The DDS228 single-phase electronic energy meter (meter display) is an energy metering product developed and produced by our company, suitable for measuring single-phase AC active energy with a rated voltage of 220V and a frequency of 50Hz. This table has the advantages of high reliability, high accuracy, and long lifespan. It is suitable for a wide voltage range and does not require adjustment after leaving the factory. It can be widely used in the measurement of single-phase AC power in urban, rural, or factory enterprises.

Reference standard:

• GB/T17215.321-2008 "Special Requirements for AC Measuring Equipment Part 21: Static Active Energy Meters (Class 1 and Class 2)"

• GB/T 15284—200Special Requirements for Multi Rate Energy Meters

working principle

After high-precision sampling, the measured AC voltage and current are sent to a dedicated energy metering chip for a series of digital processing, which converts them into pulse frequency signals proportional to the active power and motor drive signals; The pulse frequency signal drives the electric energy pulse lamp, and the motor drive signal drives the meter to accumulate electricity. The principle block diagram is shown in Figure 1.

Figure 1 Working principle block diagram

Technical Features

• 1. Designed and manufactured using advanced application specific integrated circuits and SMT, hot air reflow soldering, and wave soldering processes, ensuring reliable quality.

• 2. Designed with a wide voltage range, the meter can operate normally from 154V to 264V, and remains undamaged at 418V, improving its adaptability to the working environment.

• 3. Fully sealed, dust-proof and waterproof design. The case material has excellent flame retardant, corrosion resistance and aging resistance.

Specifications and constants

Note: Special constants can be customized according to requirements.

Main technical parameters

• Reference voltage: 220V

• Reference current: 1.5A, 5A, 10A, 20A

• Reference frequency: 50Hz

• Basic error: meets the requirements of GB/T17215.321-2008. Starting current: ≤ 0.004Ib (direct connection type)

• Submerging: When the electric energy meter applies 115% of the reference voltage and there is no current in the current circuit, the test output of the electric energy meter should not generate more than one pulse within 10 times the time when the electric energy meter generates one pulse under the reference voltage and starting current.

• power waste:

  Voltage line power consumption (non communication state): ≤ 1W

  Power consumption of 8VA voltage line (communication state): ≤ 3W

  12VA current line power consumption: ≤ 1VA (at Ib current)

  
  

• Working temperature range: -25 ℃~60 ℃

• Extreme working temperature range: -40 ℃ to 70 ℃

• Storage and transportation limit temperature range: -40 ℃ to 70 ℃

• Relative humidity:

  Annual average<75%

  30 days (these days are naturally distributed within a year)

  95% occasionally occur on other days, 85%

  
  

• Atmospheric pressure: 63.0kPa~106.0kPa (altitude 4000m and below)

• Normal operating voltage: 0.9Un~1.1Un

• Extended operating voltage: 0.8Un~1.15Un

• Product lifespan: greater than 10 years

• Dimensions: 112 × 160 × 58 mm Weight: Approximately 0.5kg

• Pulse width of electric energy: 80 ± 20mS, typical value: 80mS

Main Function Introduction

1. Measurement function

• It has the function of measuring positive and negative active energy, and the negative active energy is included in the positive active energy.

2 Display function

• a) The meter displays the cumulative electricity consumption in kWh, with 6 digits and 1 decimal place.

• b) The energy meter uses high brightness, long-life LED as the indicator light;

  Pulse indicator light: red, usually off, flashing when measuring active energy.

3 pulse output

• The electric energy meter has the function of outputting LED pulses and electrical pulses proportional to the measured electrical energy. The characteristics of the optical testing output device comply with the requirements of GB/T17215.211-2006. The characteristics of the electrical test output device comply with the requirements of GB/T15284-2002.

Installation and Wiring

1. The installation dimensions of the electric meter are shown in Figure 3. There are hook screw holes on the upper part of the meter, which are fixed with M4 hook screws. There are two installation holes on the lower part of the meter, which are fixed to the terminal block with M4 × 10 or M4 × 12 ordinary screws.

Figure 3: Dimensions and Installation Diagram of the Electric Meter

2. Main terminal and auxiliary terminal wiring

The main terminal wiring is shown in Figure 4, where 1 is an L input, 2 is an L output, 3 is an N input, and 4 is an N output. There are 8 auxiliary terminals above the main terminal of the electric energy meter, of which 7 and 8 are metering pulse outputs

Figure 4 Terminal Wiring Diagram

The energy meter should be installed indoors as much as possible, and a dedicated instrument box should be used for outdoor installation protection. The installation base plate should be fixed on a sturdy, fire-resistant, and vibration resistant wall surface. There should be no corrosive gases in the surrounding air when installing an electric energy meter, and dust, salt spray, etc. should be avoided.

When using an electric energy meter, it is necessary to strictly follow the wiring diagram inside the tail cover of the meter. It is recommended to use copper wire for the leads connected to the terminal block. The screws that fix the leads inside the terminal block should be tightened to avoid burning out the electric energy meter due to poor contact and heat generation.

Transportation and Storage

The product should not be subjected to severe impact during transportation and unpacking, and should be transported and stored in accordance with GB/T15464-1995 "General Technical Conditions for Packaging of Instruments and Meters". The inventory and storage should be stored on brackets under the original packaging conditions, with a stacking height of no more than 5 layers. The storage area should be clean, with an ambient temperature of no more than -40 ℃~+70 ℃, a relative humidity of no more than 95%, and no corrosive gases or molds in the air.

Precautions

There are no user adjustable devices inside this table.

When installing and using, all wiring must be tightened to avoid heating and damaging the energy meter due to poor contact. The incoming and outgoing power lines cannot be reversed. The energy meter should be installed indoors in a ventilated and dry place to avoid direct exposure of strong light to the infrared receiving window. When using an infrared interface for communication, strong light should be avoided from interfering with the infrared communication interface, and attention should be paid to adjusting the infrared communication distance and angle to ensure the reliability of communication.

Attachment 1: Reference Diagram of Meter Display Interface