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Dimmerstat Continuously Variable Voltage Auto Transformer

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DESCRIPTION

Dimmerstat' 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 Dimmerstat 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 Dimmerstats 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.
• INSULATION RESISTANCE 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, Dimmerstats 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 Dimmerstats are available in 3 types.
• Portable type (P) with sheet steel enclosure for floor / table use.
• Flush type (F) with open type construction. Suitable for panel mounting.
• Tank type (T) immersed in oil in sheet steel tank with rollers.

 

Three phase Dimmerstat is usually ganged assembly of 3 coils, available in all 3 types: P, F, T.
Higher rating Dimmerstat (above 200 Amps) use 2/3 or more coils in parallel with load balancing arrangements.
Motorised Dimmerstat 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
• Auditorium, Hotels, Conference Halls, Exhibitions, Laboratories etc.,
• AC Voltage Stabilizers, Rectifiers, Battery Chargers.
• Temperature control of Ovens, Furnaces.
• Testing of Instruments, Relays, Circuit Breakers etc.
• Welding, Electro-plating, Anodizing etc.
• 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.
2nd block Dimmerstat (D) Continuously variable voltage auto transformer.
3rd block No. of coils 1, 2, 3, 4, 6, 9, 12, 15.
4th 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.
5th block Provided with 
motor drive (M)		 "Step-syn" 230V 1Ph AC 50Hz. 60 rpm motor having instantaneous start-stop-reverse characteristics.
6th block Approx. time in secs. for full rotation sweep time 8,15,30,45,60,120

 

e.g. 1 2 3 4 5 6 75 A Dimmerstat with 3 coils (Three phase) in oil-cooled
tank construction with motor drive having 15 sec. sweep.
75 D 3 T M 15

 

e.g. 1 2 3 4 8 A Dimmerstat with 1coil (Single phase). Portable type &
suitable for manual operation (no motorisation)
8 D 1 P

 

Simiarly, other Dimmerstats can be configured & ordered.

Our Vision

* To embrace new technologies and methods. * To give unsurpassed products and services to the clients. * To constantly look for improvement and changes.

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