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H. T. Transformer
Technical Specifications
Technical Particulars
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Specifications
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Rated KVA
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63kVA - 3150kVA
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Rated Primary
Voltage
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11 KV
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Rated Secondary
Voltage
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433 Volts
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Primary
Connections
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Delta
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Secondary
Connections
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Star
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Vector Group
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DYN 11
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Rated Frequency
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50 Hz
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No of Phases
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Three
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Installation
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Out Door
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Cooling
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Onan
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Ambient
Conditions
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Ref. IS-2026
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Rise of Temp. in
Oil., By Thermometer Above Ambient
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50 Deg. C
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Separate Source
Voltage Withstand Test For 60 Sec
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PRI 28 KV/SEC3KV
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Winding Material
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Copper EC Grade
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Core Material
Low Loss High Permeability
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CRGO M4
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Oil Transformer
Oil Conforming TO
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IS - 335
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Thermal Class
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A
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Tolerance on
Performance
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As per IS 2026
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Tolerance on
Weights & Dimensions
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+/- 10%
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Schedule
of Fittings
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Lifting Lugs
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2 nos.
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Earthing
Terminals
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2 nos. |
Oil Filling
Point with Cover
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01 nos. |
Drain Valve Plug
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01 nos. |
Oil Filter Valve
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01 nos. |
Name Plate
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01 nos. |
Terminal Plate
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01 nos. |
Tap Switch of
Load with Locking Device & Handle
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01 nos. |
Thermo Meter
Pocket
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01 nos. |
Dial Type
Thermometer (4" Dial)
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01 nos. |
Conservator With
Drain Plug & Oil level Gauge
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01 nos. |
Air Release Device
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01 nos. |
Bi-Directional
Rollers (Flat)
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04 nos. |
HV Terminals (3
NOS. Bushings) Delta Connection
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03 nos. |
I.V. Terminals
In Box (Star Connection)
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04 nos. |
Core
Core is made from best grade imported cold rolled grain oriented
silicon steel lamination with the latest techique of annealing.
Interleaved and mitered joints reduce the core losses and magnetizing
current considerably. Core is specially designed to sustain
over-fluxing up to 12.5%. Core is clamped with steel channels rigidly
to reduce to cartite sound level and earthed with electrical grade
copper sheet.
Winding
The winding can be of any type (i) spiral (ii) Crossover (iii) helical
(iv) disc, designed to withstand the optimum electrical, mechanical,
dynamic and thermal stresses depending upon the current and voltage.
The coils are wound with electrolytic grade high conductivity, annealed
wire and strips covered with high quality insulation. All coils are
reinforced, insulated to withstand the effect of short circuits and
impulse voltage shocks. Cooling ducts are provided to minimize the
hotspot temperature and temperature gradient between winding and oil.
Insulation and Oil
- The insulation material like pre-compressed boards, corrugated
cylinders, Bakelite tube, insulating tapes, empire sleeves, glass
sleeves varnish, epoxy bushing, porcelain bushing etc. are used of best
quality to ensure long life to the transformers. Oil used as a coolant
and insulating medium is of the best quality conforming to IS: 335.
Before filling into Filtration Plant' and tested to ensure free from
moisture and dust.
- Tank and Radiator: The tanks are made from premium quality
mild steel sheets, plates and pipes by electrical welding. Proper
bracing and stiffeners are provided for robust construction. The tank
are tested at specific pressure for leakage at joints/welds. Sufficient
cooling radiators are provided for maximum dissipation of heat during
extreme ambient temperatures. The radiators are made from best grade
pressed steel fins or elliptical tubes.
Painting
Tank surface exposed to atmosphere is painted with two coats of red
oxide paint to provide maximum resistance to corrosion and two coats of
epoxy based anti-corrosive enamel paint. Surface in contact with oil is
treated with two coat of 'Oil and Heat Resistant Paint'. This paint has
more effective resistance compared to ordinary enamel paint against
corrosion and oil/heat reactions.
Vector Group
- Various vector groups can be provided as per demand.
- Temperature Rise: Our transformers are designed for
maximum temperature rise at full rated load 40°C/50°C for
oil/winding for aluminium wound transformers and 45°C/55°C for
copper wound transformers.
Overloading
Our transformers are designed for overloading excess than normal rating as per IS: 6600.
Fitting and Accessories
Standard fitting recommended in IS 2026-1977 are provided. Extra
fittings like buchholzrelay, dial type thermometer, winding temperature
indicator, marshalling box, H.V. & I.V. cable boxes, PRV and OSP
are provided as per the requirement of the customers.
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