Specifications and Product Details:

DT862 series Three Phase Energy Meter

General

The DT862 three-phase four-wire meter is designed to meet the latest IEC 60521 and BS EN60521 standards for measuring active energy in three-phase four-wire alternating current power grids. Connection is direct or by instrument transformers. The average service life (MTTF) of the meter is 15 years and the maximal overload capacity is 400%Ib

Meter case

The meter case meets the protection requirements set by IP52 of IEC 60529. The series types of cases and terminal covers are available.

Terminal block:

Terminals:

The connection terminals are made of nickel-plated brass with features of high mechanical strength, good conductivity and corrosion-resistance.

Terminal block:

For meter of steel or PC base, the terminal block is molded of heat-and flame-resistant bakelite. The voltage test link can be located inside or outside of the meter case.

Driving system

It has three electromagnet elements. Each element consists of a voltage element and a current element, all of which are mounted on the meter frame with two screws. Voltage coil is enwrapped in a thermoplastic case to ensure fine insulation. In addition, the voltage element has a low load adjustment mechanism.

The current element employs a simple and reliable load curve compensation mechanism to ensure the flat characteristic curve. An inductive load adjustment mechanism is on it.

Rotor

The rotor disk is made of a hard and high purity aluminum. The rotor shaft is turned of highstrength brass. There is a small hole on the upper end for storing lubrication and for fitting a brass bearing. The lower end is cone-shaped to ensure fine guiding of the rotor.

Braking element

The magnet cube is made of AINiCo5 alloy and designed as U-shaped so that the effect of short-time over currents upon the magnet is negligible. A temperature compensation plate made of a special alloy, is mounted outside of the magnet. The error of full load can be controlled precisely by turning the adjustment mechanism.

Frame

The frame is die-casted by high quality aluminum-silicon alloy of stable property to avoid distortion. The application of static spray-painting on the surface prevents the frame from oxidation.

Upper bearing

The guide pin is made of abrasion-proof stainless steel, and embedded into the brass sleeve.

Lower bearing

Both double jewel bearing and magnetic bearing are available.

The cyclometer type register consists of six drums. The kWh can be read directly. The drum is made of polycarbonate. The framework is made of hard aluminum alloy and can be manually adjusted and fixed with two screws to insure the proper mesh with the worm on the rotor shaft.

Technical data

1	Meter type	DT862
2	Applicable Standards	IEC60521
3	Accuracy class (according to IEC 60521)	CT operated: Class 2	Direct connected: Class2
4	Average service life (MTTF)	15 years
5	Basic current (lb) A	1.5 3 2.5 5 10 15 20 30
6	Maximum current (lmax) A	6 6 10 20 40 50 80 100
7	Rating current of transformer In	5A Direct connection
8	Reference voltage Un	3×57.7/100V,3×220/380V 3×230/400V,3×240/415V
9	Reference frequency fn	50Hz,60Hz
10	Power losses in voltage circuit at 50Hz Un	1.0W/5VA
11	Power losses in current circuit at 50Hz Un Ib	<0.5VA
12	Non-rinning with no-load	0.8~1.1Un
13	Starting current	0.5%Ib
14	Mean temperature coefficient: From 0.1Ib To Imax at unity PF From 0.2Ib to Imax at unity 0.5 lagging	<0.08%/ <0.12%/
15	Insulation level: Withstand A. C. Voltage for 50Hz, 1min Withstand impulse voltage 1.2/50µs	>2kV(when bakelite base>4kV) >6KV(when bakelite base>8kV)
16	Rated load torque at unity PF, Ib	>800µMn
17	Weight of rotor	54g
18	Weight of meter	≈3.5kg
19	Meter base	Steel,Bakelite
20	Meter cover	ABS, transparent PC, Bakelite
21	Terminal cover	ABS, Bakelite, PC
22	Register	Cyclometer single, Unidirectional
23	Option	Reverse running stopper