Digital energy meter

Name:DT8 three phase kwh meter

The DT8 three-phase fore-wire meter is designed to meet the latest IEC62053-21,IEC62052-11 standards for measuring active energy in three-phase four-wire alternating current power grids. Connection is direct or by instrument transformers. The meter is KEMA certified. It has an average service life(MTTF)of 20 years and maximum overload capacity of 600%Ib.
Construction
Meter case
It meets the protection requirements set by protection class IP53 of IEC62053-21. The series types of cases and terminal covers are available.
Terminals
The connection terminals are made for nickel-plated brass with features of high mechanical Strength, good conductivity and corrosion-resistance.
Terminal block
The terminal block is injection molded of heat-and fire-resistant Bakelite . The voltage test link can be located inside or outside of the meter case.
Driving system
The driving system employs three single electromagnet elements, all of which are mounted on the meter frame with three screws. Each electromagnet element consists of voltage element, current element and connection board. In addition, the voltage electromagnet has low load and inductive load adjustment mechanisms. The current element employs a simple and reliable load curve compensation mechanism to ensure the flat characteristic curve.
Rotor
The rotor shaft is turned of high strength aluminum alloy. The upper end of the shaft is pressed with a worm which is made of thermoplastic, and the lower end is embedded with a graphite bearing which is self-lubricative and friction-resistant to ensure long service life of the meter.
Braking element
The magnet 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 embedded in the braking magnet. The rotor speed can be adjusted largely and continuously by rotating the whole magnet.
Frame
The frame is die-casted by high quality Si Al alloy. Its structure is designed as W-shaped of stable property to avoid distortion, and its surface is treated with chromate to achieve reliable and durable coating against oxidation.
Upper bearing
The pin is made of abrasion-proof stainless steel, and pressed into the brass sleeve. It is the rotor guide and runs in the plastic worm of the rotor.
Lower bearing
The magnetic suspension bearing consists of two ring shaped magnets, a guide pin and a bearing base. The pin made of stainless steel runs in the graphite sleeve of the rotor. No lubrication is needed.
Register
The cyclometer type register consists of six drums. It can be read directly. The drum is made of polycarbonate. The framework is embedded with a high-strength self-lubricating plastic bearing. No lubrication of bearings is needed during the service life.
Technical data

1	Meter type	DT8
2	Applicable Standards	IEC60521、IEC514
3	Accuracy class (according to IEC 60521)	Transformer operated: Class 1	Direct connected: Class2
4	Average service life (MTTF)	20 years
5	Basic current (lb) A	1.5 3 5 5 10 15 20 30
6	Maximum current (lmax) A	6 6 10 20 40 60 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/4.5VA
11	Power losses in current circuit at 50Hz Un Ib	<0.5VA
12	Non-running with no-load	0.8~1.1Un
13	Starting current	0.4%Ib 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	>2kV(when bakelite base>4kV) >6KV(when bakelite base>8kV)
16	Rated load torque at unity PF, Ib	>800µMn
17	Weight of rotor	48g
18	Weight of meter	≈3.5kg
19	Meter base	Steel, Bakelite, PC
20	Meter cover	Bakelite, transparent PC
21	Terminal cover	ABS, Bakelite, PC
22	Register	Cyclometer single, Unidirectional, Jumping
23	Option	Reverse running stopper