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Dimmer Continuosly Variable Voltage Auto-Transformer

D.C. Power Rectifiers

Dimmer' is registered trade mark for AE make continuously variable voltage auto-transformer. It is the most effective device for stepless, breakless & continuous control of AC voltage & therefore for various parameters, dependent on AC voltage.

The basic Dimmer is meant for operation from a nominal input voltage of 240V 1ph AC & can give output voltage anywhere between 0 to 240V or 0 to 270V AC by simple transformer action. Three such Dimmers connected electrically in star and mechanically in tandem, become suitable for operation from a nominal input voltage of 415V 3Ph AC and can give output anywhere between 0 to 415V or 0 to 470V.

FEATURES
  • Simple, rugged construction.
  • Coils made from high grade CRGO Silicon Steel & 99.9% pure copper.
  • Output voltage variation is smooth, continuous, breakless & linearly proportional to angular rotation.
  • High efficiency.
  • Negligible waveform & power factor distortion.
  • Excellent short time overload capacity.
  • Remote operation possible by motorization.
  • Wide range of current ratings.
  • High quality carbon brush used for current collection.
ELECTRICAL SPECIFICATIONS

MODEL

a) Flush Open Manual (Air Cooled) — F

 

 

b) Portable Enclosed Manual (Air Cooled) — P

c) In Tank Manual (Oil Cooled) — T
    'F', 'P', T suffixed by 'M' means motor operated models.

OPERATING VOLTAGE

For Single Phase - 240V AC, 50-60 Hz. 1- ph.

For Three Phase - 415V AC, 50 -60 Hz., 3 - ph - 4wire.

CURRENT RATINGS

For Oil Cooled models, maximum current & continuouscurrent are one & the same.

For Air Cooled models, the ratings are as shown below.

Maximum Current

0.7

2

4

8

10

15

20

28

Continuous Current

0.6

1.8

3.8

6.5

9

11.5

16

22

OPERATING TEMP.

0° - 45°C.

INSULATIONRESISTANCE

Not less than 5 Mohms at 500V DC.

DIELECTRIC TEST

2.5kV RMS for 1 minute.

STORAGE TEMP.

-9°C to 70°C

HUMIDITY

Upto 95% RH

CONFORMS TO

I.S. 5142.

Notes

1

As output voltage is continuously variable, Dimmers are rated in terms of current that can be drawn from the output.

2

Oil should be "Transformer Oil" conforming to IS 335, IEC 296.

Mechanical Construction

Single phase Dimmers are available in 3 types.

1

Portable type (P) with sheet steel enclosure for floor / table use.

2

Flush type (F) with open type construction. Suitable for panel mounting.

3

Tank type (T) immersed in oil in sheet steel tank with rollers.

Three phase Dimmer is usually ganged assembly of 3 coils, available in all 3 types: P, F, T.

Higher rating Dimmer (above 200 Amps) use 2/3 or more coils in parallel with load balancing arrangements. Motorised Dimmer uses 240V AC Step-Syn Motor having 60 rpm speed at 50Hz. With proper gearing higher torque at lower speed can be achieved.

Standard gear ratios used provide sweep time of 8, 15, 30, 45, 60,120secs.

APPLICATIONS

1

Auditorium, Hotels, Conference Halls, Exhibitions, Laboratories etc.,

2

AC Voltage Stabilizers, Rectifiers, Battery Chargers.

3

Temperature control of Ovens, Furnaces.

4

Testing of Instruments, Relays, Circuit Breakers etc.

5

Welding, Electro-plating, Anodizing etc.

6

Colleges & Universities.

Ordering Information (as per code specified below)

1st block

Output current rating amps

0.7,2,4,8,10,15,20,28,40,50,60,75,100,125,150,
200,300,400, 500,600,800,1000,1200,1500 A.

2st block

Dimmer (D)

Continuously variable voltage auto transformer

3st block

No. of coils

1, 2, 3, 4, 6, 9, 12, 15.

4st block

Type of construction.

F, P, T
F = Flush, back of panel open.
P = Portable, floor, table mounting, air cooled with enclosure.
T = In tank, immersed in oil.

5st block

Provided with motor drive (M)

"Step-syn" 230V 1Ph AC 50Hz. 60 rpm motor having instantaneous start-stop-reverse characteristics.

6st block

Approx. time in secs. for full rotation sweep time

8,15,30,45,60,120


e.g.

0.7

2

4

8

10

15

20

28

75 A Dimmer with 3 coils (Three phase) in oil-cooled tank construction with motor drive having 15 sec. sweep.

0.6

1.8

3.8

6.5

9

11.5

16

22


e.g.

1

2

3

4

8 A Dimmer with 1coil (Single phase). Portable type & suitable for manual operation (no motorisation)

8

D

1

P

Simiarly, other Dimmers can be configured & ordered.

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