DTX866/DSX866 Three phase electronic reactive energy meter (Liquid Display)

Overview

• DTS (X) and DSS (X) three-phase reactive power combination energy meter (hereinafter referred to as the instrument) is an indoor three-phase energy meter designed and developed by our company to adapt to China's power grid transformation and national conditions. It has high accuracy and feasibility. This instrument adopts internationally advanced ultra-low power large-scale integrated circuit technology and SMT advanced process. The key components are selected from international brands and long-life devices, which improves the reliability of the product and extends its service life. Accurate measurement of active and reactive energy, and the ability to read electricity through infrared communication, with intuitive readings and convenient use. This instrument design complies with the relevant technical requirements for three-phase static energy meters in standards GB/T 17215.321-2008 "Level 1 and Level 2 Static AC Active Energy Meters", GB/T 17215.323-2008 "Level 2 and Level 3 Static AC Reactive Energy Meters", and DL/T 645-1997 "Communication Protocol for Multi functional Energy Meters".

Main specifications and parameters

• Specification Model

  Accuracy level	Active power level 1.0, reactive power level 2.0
  rated current	1.5（6）A 5（20）A 10（40）A 15（60）A 20（80）A 30（100）A
  rated voltage	3X100V 3X100V/57.7V 3X380V/220V 3X380V

  
  

• Basic error

  Balance load percentage error limit
  

  current value	Active Level 1.0		Reactive power level 2.0
  	Power factor COS Φ	Error%	Power factor SIN Φ	Error%
  0.05In	one	±1.5	one	±2.5
  0.1In	0.5L or 0.8C	±1.5	0.5L or 0.8C	±2.5
  0.1In~Imax	one	±1.0	one	±2.0
  0.2In~Imax	0.5L or 0.8C	±1.0	0.5L or 0.8C	±2.0

  Percentage error with unbalanced load: ± 2.0 for active level 1.0 meter.
  

  
  

• Starting current

  Connected through a current transformer: the active power of the 1.0 level meter is 0.002Ib.

  Direct access: The active power level 1.0 meter is 0.004Ib.
  

  
  

• Stealth

  When the voltage circuit is 115% of the rated voltage and the current circuit has no current, the test output of the energy meter should not generate more than one pulse.
  

  
  

• power consumption

  Voltage circuit power consumption ≤ 1.5W/5VA, current circuit power consumption ≤ 2VA
  

  
  

• Working voltage range

  Normal operating voltage: 0.9-1.1Un

  Maximum operating voltage: 0.7~1.2Un
  

  
  

• environmental conditions

  The standard operating temperature is -25 ℃ to+55 ℃

  The maximum working temperature is -40 ℃ to+70 ℃

  Annual average relative humidity: ≤ 75%
  

  
  

• Instrument safety performance

  The instrument indicators comply with the requirements of GB/T17215.321-2008 "Level 1 and Level 2 Static AC Active Energy Meters" and GB/T17215.323-2008 "Level 2 and Level 3 Static AC Reactive Energy Meters".
  

Main functions

• Electric energy metering function

  Energy metering function: It has the ability to measure the total active and reactive energy in the forward direction, as well as the total active and reactive energy in the reverse direction (specific data items can be found in the attached data table)

  4.1.3 Three phase power supply with the function of recording active and reactive power history for the past 2 months. When one or both phases are powered off, the measurement accuracy is not affected. After power failure, all stored data will not be lost and can be maintained for more than 10 years.

  
  

• Output function

  It has the function of coupling isolated active and reactive passive pulse test port output (meeting the requirements of remote pulse output, with a pulse width of 80ms ± 20ms).

  
  

• alarm function

  When there is a phase loss, the corresponding voltage symbol on the LCD disappears.

  
  

• Communication function 4.4.1: Infrared communication can be performed through handheld terminals or PCs to complete programming settings and meter reading. The communication symbol lights up during communication, making it convenient, intuitive, and reliable.

  The communication protocol refers to DL/T645-1997 protocol, and the specific identification code can be found in Appendix 2.

  
  

  
  

• display function

  

  
  

  Using a wide temperature and large LCD display to show various types of information; The number of digits displayed for electric energy is 6 integers and 2 decimals.

  It has the function of automatic parameter rotation, with a rotation time of 8 seconds. 4.5.3 has the function of power-off pressing, and after 15 seconds, the LCD will automatically turn off (optional).

  
  

working principle

• Working principle of electric energy metering unit

  The core of the energy metering unit in this instrument is the metering chip. The current of each phase of the measured electrical energy is sampled by a transformer to obtain a voltage signal, which is then amplified by the differential amplifier circuit inside the measuring chip. The amplified signal is converted into a digital signal proportional to it through A/D conversion, and after high pass filtering to remove the DC component in the signal, it enters one input terminal of the digital multiplier. The voltage signal of the measured electrical energy is sampled through resistance voltage division, amplified by the differential amplifier circuit inside the measuring chip, and then converted into a digital signal proportional to it through A/D. It enters the other input terminal of the digital multiplier and multiplies with the signal of the current channel to complete the instantaneous power measurement of the measured electrical energy. The instantaneous power output of each phase is integrated through a digital low-pass filter, and then the absolute value is accumulated before entering the "digital/frequency" converter. The pulses output by the frequency divider circuit are isolated and sent to the CPU unit for processing.

  
  

• Working principle of CPU unit

  The high-frequency pulse output from the electric energy metering unit is used as a passive pulse output through a photoelectric coupler for factory inspection and user verification of the electric energy meter; Another route is sent to the CPU chip for data processing. Under the instructions of the system (energy meter program), the CPU calculates the active power value based on the memory and instrument constants in the data storage, and then transfers it to the internal memory. The stored data can be displayed through LCD or output through infrared and RS485 communication methods.

Installation and wiring methods

• The instrument shall be inspected and sealed with lead before leaving the factory. Before installation and use, it is necessary to check whether the lead seal is intact. If the lead seal is intact, it can be installed and used. For instruments without lead seals or stored for too long, relevant departments should be asked to re inspect them. Only after passing the inspection can they be installed and used.

• Electric energy meters can be installed indoors or outdoors, and the base plate for installing the meter should be fixed on a sturdy fire-resistant wall. There should be no corrosive gases in the air to ensure safe and reliable installation and use.

• The electric energy meter should be wired according to the wiring diagram on the junction box, preferably with copper wire ends. The screws inside the terminal box should be tightened to avoid burning due to poor contact.

• The electric energy meter should be properly wired and can enter normal operation after being powered on. If any abnormal phenomena are found during use, users should not disassemble it without authorization and should seek the assistance of qualified professionals for handling.

• wiring diagram

  

  

  
  

• Schematic diagram of pulse testing port

  

  Internal optocoupler output of the table

  
  

• Outline and installation dimension diagram

  

Transportation and Storage

• The transportation and unpacking of electric energy meters should not be subjected to severe impacts. They should be transported and stored in accordance with the provisions of JB/T 9329-1999 "Basic Environmental Conditions and Test Methods for Transportation, Storage and Transport of Instruments and Meters", and placed according to the requirements on the packaging box.

• The energy meter should be stored in its original packaging, with a storage environment temperature of -25 ℃ to+70 ℃, an average relative humidity not exceeding 75%, and no corrosive gases in the storage environment. It should be moisture-proof.

• Electric energy meters should be stored in the warehouse and placed on shelves with a stacking height of no more than 5 boxes. After unpacking, the stacking height of a single packaged electric energy meter should not exceed 10 pieces.

• Please do not power up the meter and contact the supplier as soon as possible if there are obvious signs of damage to the casing caused by severe impact or falling from a high altitude during transportation, retrieval, or installation.