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DD28 single phase meter - DD28

1.Long term stability and high reliability, 2.High impulse level protection, 3.High accuracy load ranges, 4.Easy for maintenance - more info check here: http://www.buymeasuringtools.com/DD28-single-phase-meter-10235766/

Quick Brief

Place of Origin: Zhejiang China (Mainland) Brand Name: Gomelong Model Number: DD28 Display Type: Digital Only Phase: Single Phase Measuring Energy Range: 00000-99999kWh Accuracy Class: 1.0or2.0 Output Voltage: 230V Operating Temperature: -25-50℃ Dimensions: 216*142.5*114 Max Current: 100A

Product Features:

1.Long term stability and high reliability

2.High impulse level protection

3.High accuracy load ranges

4.Easy for maintenance

Business Terms:

Minimum Order Quantity: 300 Piece/Pieces

Supply Ability: 30000 Piece/Pieces per Month

Payment Terms: L/C,D/A,D/P,T/T,Western Union

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DD28 single phase meter
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Product Packagings & Delivery Terms:

Packaging Detail: depends on destination, type of transport and specificrequirements of individual buyers.

Delivery Detail: in 25Days

Specifications and Product Details:

The electricity meter type DD28 is suitable for measuring active energy for direct connection in single-phase, two-wire networks.

COMPLIANCE WITH STANDARDS

The measuring and technical qualities of the meter DD28 comply to International Electrotechnical Commission Publications (IEC 521), German Standard (VDE 0418)...

Their construction and mechanical dimensions comply with DIN 43857 and all respective DIN dimensional standards. Its construction enables adaptation to various requests in the measuring and technical qualities.

Meter typeDD28

DD282

DD283

DD284

Reference voltage

230 V

Special version

from 100 V to 500 V

Reference frequency

50 Hz (special version 60 Hz)

Consumption of voltage electromagnet at 230 V, 50 Hz

1 W

3,9 VA

Basic current (A)1051010510
Maximum current (A)302040503060
Thermal current 1,2 Imax (A)362448603672
Consumption of current electromagnet at basic current0,18 W

0,35 VA

0,14 W

0,33 VA

0,18 W

0,35 VA

0,12 W

0,23 VA

0,12 W

0,23 VA

0,12 W

0,23 VA

Specific speed (r.p.m.)

23

14,375

Rated torque at Ur, Ib, fr,

from 4,00 to 4,70 x 10-4 Nm approx.

Starting current

0,45 % Ib

No-load running

there is no no-load running from 80 % to 110 % Uref

Dielectric strength

2000 V, 1 min.

Surge voltage strength 1,2/50 µs

> 7 kV

Rotor weight

– meters with magnetic bearings 27 g

– meters with dual-cup bearing 24 g

Weight of meter

1,3 kg

CONSTRUCTION

Base and cover

The case comprises base and cover of moulded insulating black material (Bakelite) highly resistant to creep currents. Improved version of the meter case enables better sealing of the meter cover and the base by means of Perbonane sealing

gasket inserted in the groove of meter cover. It prevents penetra- tion of dust and humidity into

the meter interior.

Degree of protection level com- plies to IEC 529 - IP 53.

Both, the bakelite or the thermo- plastic transparent meter cover can be applied to the meter.

The meter cover is fixed to the base diagonally by two captive sealing screws.

The bakelite cover is provided with a glass window through the meter can be read and the rotor observed. The window is fixed in the cover by means of a frame held in position and

by four fixing washers and sealed by silicon material.

The transparent meter cover is made of solid, self-extinguish- able, thermoplastic material.

The hanging hook and two bores for fixing the meter are also provided on the meter base.

Terminal block

This is an integral part of the meter base and is dust proof. The brass terminals are inserted into the terminal aperture from the front side of the meter base. In addition the shutter made of solid, self-extinguishable, ther- moplastic material is screwed over the terminal after built - in them. Maximum diameter of the terminal hole is 6,5 mm or on special request 7 mm, which enable the connection of outer wires more than 25 mm2. Fixing of outer wire is provided by means of two M6 screws. Diam- eter of the auxiliary terminal hole is 3,2 mm.

The voltage circuit can be dis- connected from the current cir- cuit in two ways :

– under the terminal cover by removing the terminal link and / or

– under the main meter cover by removing the voltage coil connection from current to voltage terminal.

Terminal cover

There are two terminal covers available - short which covers only the terminal compartment and extended which extends below the meter. Both covers are sealed independently from the meter case.

Carrying frame

is made of die - cast SiAl alloy, which enables high mechanical strenght and stability during the long time operation period. The carrying frame is fixed by two self-cut thread screws to the bakelite bearer made on the moulded meter base.

Driving system

The tangentional driving element is fixed to the robust carrying frame and consists of separate voltage and current electromag- nets.

The voltage coil is wound onto a thermoplastic frame covered by PVC shrinking tube. It can be additionally insulated by polyurethane resin to give higher breakdown resistance.

The current coil is synthetic resin insulated wire formed around a thermoplastic frame and give additional insulation against the current core and the carrying frame.

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