DT86-4 Three phase four wire active energy meter

Purpose and Scope of Application

• The D86 series three-phase energy meters (including DT862/DT864 three-phase four wire active energy meters, DS862/DS864 three-phase three wire active energy meters, DX862/DX864 three-phase four wire reactive energy meters, DX863/DX865 three-phase three wire reactive energy meters) are induction type AC energy meters used for measuring active and reactive energy in three-phase power grids with a reference frequency of 50Hz.

• The electric energy meter is designed for fixed installation, with a reference temperature of 23 ℃ and a relative humidity not exceeding 85%. It should also be free from corrosive gases in the air and avoid the influence of dust, sand, mold, insects, etc.

Main specifications

Technical Specifications

Basic error:

• Basic error during load balancing

  Current value I			power factor		Percentage error limit for instruments of various levels
  Directly connected to the instrument panel		Connected to the instrument through a transformer			Level 1.0	Level 2.0	Level 3.0
  meritorious	0.05Ib	0.02In	cosφ	one	±1.5	±2.5	-
  	0.1Ib～Imax	0.05In～Imax		one	±1.0	±2.0	-
  	0.1Ib	0.05In		0.5L 0.8C	±1.5 ±1.5	±2.5 -	-
  							-
  	0.2Ib～Imax	0.1In～Imax		0.5L 0.8C	±1.0 ±1.0	±2.0 -	-
  							-
  	When the user has special requirements (0.2Ib~Imax, 0.1In~Imax)			0.25L 0.5C	±3.5 ±2.5	- -	- -
  no merit	0.1Ib	0.05In	sinφ (L or C)	one	-	±3.0	±4.0
  	0.2Ib～Imax	0.1In～Imax		one	-	±2.0	±3.0
  	0.2Ib	0.1In		zero point five	-	±3.0	±4.0
  				zero point five zero point two five	-	±2.0 ±4.0	±3.0 ±6.0
  	0.5Ib～Imax	0.2In～Imax			-

• Basic error during unbalanced load

  current value		power factor Cos θ or sin θ	Percentage error limit for instruments of various levels
  Directly connected to the instrument panel	Connected to the instrument through a transformer		meritorious		no merit
  			Level 1.0	Level 2.0	Level 2.0	Level 3.0
  0.2Ib～Imax	0.1In～Imax	one	±2.0	±3.0	-	-
  0.5Ib～Imax	0.2In～Imax	0.5L	±2.0	±3.0	-	-
  0.2Ib～Imax	0.1In～Imax	1 (L or C)	-	-	±3.0	±4.0
  0.5Ib～Imax	0.2In～Imax	0.5 (L or C)	-	-	±3.0	±4.0
  Imax	Imax (In)	one	The difference between the error during unbalanced load and the error during balanced load shall not exceed (%):
  			±1.5	±2.5	±2.5	±3.5

start:

Apply 0.5% calibration current to a 2.0 level energy meter when the reference voltage, reference frequency, and COS φ=1.0 or Sin φ=1.0 are used; When a 3.0 level reactive energy meter is fed with 1.0% calibration current, the dial of the meter should rotate continuously from left to right, and the starting current of the meter should increase by 0.5% calibration current when equipped with a check valve.

Subtle movement:

When there is no current in the current circuit of the energy meter and the voltage applied to the voltage circuit is 80% -110% of the reference value, the rotation of the dial of the energy meter should not exceed one full rotation.

Main structure and working principle

• The three-phase electric energy meter adopts a dual turntable and dual gemstone structure, with a separated iron core. The voltage component adopts a semi enclosed plug-in structure, which has stable performance and is easy to repair.

• The principle of a three-phase energy meter is to generate a magnetic field through voltage and current components, so that the speed obtained by the aluminum disk in the magnetic field is proportional to the load current of the energy meter, achieving the purpose of measuring electrical energy.

Installation and use

• The electric energy meter can be installed and used after passing the inspection and being sealed with a lead seal before leaving the factory. Electric energy meters without lead seals or stored for too long should be recalibrated by relevant departments before installation and use to ensure measurement accuracy.

• The electric energy meter should be installed indoors in a dry and ventilated place. The base plate for installing the electric energy meter should be placed on a sturdy and fire-resistant wall that is not easily affected by vibration. It is recommended to install it at a height of about 1.8 meters, and the installed electric energy meter should be vertical and not tilted.

• The electric energy meter should be connected to the circuit according to the specified phase sequence (positive phase sequence), and wired according to the wiring diagram on the terminal box cover. It is best to use copper wire or copper connectors to prevent the copper connectors in the terminal box from burning out due to poor contact.

• For electric energy meters used in areas with frequent thunderstorms, lightning protection measures should be taken at the installation site to avoid burning the meters due to lightning strikes.

• The load capacity of an electric energy meter is between 0.05Ib and Imax. If this load capacity is exceeded, the current coil of the electric energy meter will heat up and burn out.

• The counter of an electric energy meter has five or six digits, with black windows representing integers, white windows representing decimals, or all blue windows representing integers. The window reading of the direct access electric energy meter can directly read the electricity consumption. If the electric energy meter is connected through a transformer, the reading in the window needs to be multiplied by the multiplier of the transformer to obtain the actual reading.

Transportation and Storage

• The transportation and unpacking of electric energy meters should not be subjected to severe impacts. According to ZBY002 "Basic Environmental Conditions and Test Methods for Instrument Transportation, Transportation and Storage", transportation and storage should be carried out.

• The energy meter should be stored in its original packaging box and in a place where the ambient temperature is between 0 ℃ and+40 ℃, the relative humidity should not exceed 85%, and there should be no gas in the air that can cause corrosion.

• The electric energy meter should be stored in the warehouse and placed on a rack in its original packaging, with a stacking height not exceeding five layers.

• Electric energy meters with unpacked inner packaging should not be stored.

Outline drawing and wiring diagram

• Dimensional drawing and wiring diagram of ordinary mechanical energy meter

   

• Embedded mechanical energy meter size diagram and wiring diagram