Vijai’s Self Protected Transformers (CSP) offer a complete and safe solution against lightning, switch surges and servere secondary overloads.
Benefits :
Higher Transformer Availability : Available for a longer duration than conventional transformers. Internal breaker (Type CLR) is tripped by a standard Bi-Metallic thermal trip element, which integrates oil temperature and secondary current flow, allowing the transformer to continue to operate even under overload conditions, until the oil temperature makes coil damage imminent. Improvised CQR Type breakers can also be provided which are furnished with instantaneous magnetic trip element in addition to the Bi-Metallic thermal trip element.
More Reliable Service : CSP Transformers efficiently and effectively disconnect the load from the transformer under overload conditions. Moreover CSP components help in identifying locations where improvements in load management may be necessary.
Lower System Cost : Considering the operating costs of energy supply and replacement cost of the transformers that have failed prematurely due to overload. CSP transformers would no doubt fair better than conventional ones.
Easier an Simpler Installation : Involves only one piece of electrical equipment, the transformer and only one high voltage electrical connection to the distribution line.
Standard Fittings :
Internal Low Voltage Circuit Breaker
Internal High Voltage Protective Link
Signal Light
Operating Handle
Lightning Arrester
Rating and Diagram Plate
Primary Bushings
Secondary Bushings
Optional Fittings :
Terminal Connectors
Pressure Relief Device/Explosion Vent
Cable Box
Rollers (Uni-Directional/Bi-Directional)
Arcing Horns
Technical Specification :
Ratings
:
Single Phase : CRGO - Upto 167 kVA AMT : Upto 167 kVA Three Phase : CRGO - Upto 315 kVA AMT : Upto 315 kVA
Vijai’s Corrugated Tank Distribution Transformers are compact in size and elegant in appearance. These transformers are manufactured by using the highest quality materials, employing the most modern and reliable manufacturing practices.
These Transformers require little maintenance.
Advantages :
Compact in size : Transformers with corrugated walls are smaller than transformers with radiators.
Improved heat dissipation : the role of fins is to increase the surface of the tank, which is in contact with the cooling air. Due to the temperature rise of the windings under load, the oil temperature also rises. The hot oil rises, meets the top cover and goes down into the fins where it is cooled by the air rising up between the fins. Required heat dissipation can be achieved by varying no. of corrugations and the depths height of corrugations Elegant appearance.
Due to vertical oil channel greater stability is achieved.
The fins have sufficient degree of elasticity to absorb the expansion in volume of the liquid, due to the heating of cooling medium, at the same time providing a large dissipating surface to cool the same cooling medium.
No blockage of oil flow into the fins : Blockage of oil is possible in pressed steel type radiators due to possible closing of header pipe connection on the tank wall, unlike Corrugated tanks.
Vijai Electricals Ltd. has always been in the forefront of introducing cutting edge technologies in the field of Distribution Transformers.
After introducing concepts like the Amorphous Metal Distribution Transformers and the Completely Self-Protected Distribution Transformers which paved the way for a healthy Distribution System, Vijai is now proud to introduce Delta Core Transformers which provide improved technical reliability in terms of quality and performance. These Transformers can be manufactured till 2500 kVA, 33 kV class.
Salient Features :
Lower Noise level in the core due to minimized air gaps in the core.
Reduction in No load current as compared to the conventional stacked type.
Rugged and Robust Construction.
Compact in size and available in Round / Hexagonal Tank Versions.
Vijai has been producing drytype cast resin transformers for more than 15 years. Vijai’s cast coils are well known for their extremely low levels of partial discharge.
application
in service in diverse industries, electricity boards, nuclear / thermal / hydel power plants, railway traction and high-rise buildings, hospitals, subways, underground vaults, tunnels, school, steel factories, chemical plants, etc. Where safety is of prime concern.
precise casting under vacuum ensures extremely low levels of partial discharge.
coils have smooth finish and are robust in construction.
vijai successfully conducted seismic qualification test on cast resin transformers supplied to nuclear power installations in india, way back in 1994.
main feature & benefits :
resistant short circuits (high mechanical strengths)
non-flammable
resistant to temperature fluctuations
moisture resistant since non hygroscopic
space saving, permitting compact installation.
practically no maintenance; long and trouble-free service.
suitable for hot and humid environments.
automatic temperature control and protection.
standard fittings :
lifting eyes
off circuit tap links
rating and diagram plate
high voltage epoxy bushings
low voltage epoxy bushings
winding temperature indicator
optional fittings :
terminal connectors
special termination arrangement
cable box / bus duct
rollers (uni directional / bi directional)
thermal sensor like pt-100 for indication or
protection with temperature scanner
technical specification :
ratings
:
single phase : crgo - upto 2667 kva three phase : amt - upto 8000 kva
number of phase
:
single phase and three phase
applicable standards
:
is, iii71, iec 726, ansi. C. 12. 01 etc.
cooling
:
an, anaf
insulating fluid
:
mineral oil to specification
frequency
:
50 hz, 60 hz
polarity
:
as specified
primary voltage
:
upto 33 kv
secondary voltage
:
220/127, 480/277 v (other voltages as required)
winding material
:
copper
taping range
:
± 5% in steps of 2. 5% (other tapings as required)
Accuracy class, output & number of secondary windings as desired
Graded insulation for primary
Hermetically sealed with N2 cushion
Technical Parameters :
Description
145 kV
245 kV
1 min power frequency withstand voltage Lighting impulse withstand voltage Rated frequency Short time thermal current for 1 sec Dynamic withstand current Total creepage distance Primary current
275 kV rms
650 kV peak
50 Hz 31.5 kA rms
78.75 kA peak 3625 mm 1600 A- Higher currents can be supplied on demand
460 kV rms
1050 kV peak
50 Hz 40 kA rms
100 kA peak 6125 mm 1600 A- Higher currents can be supplied on demand
Accuracy class, output & number of secondary windings as desired
Graded insulation for primary
Hermetically sealed
Technical Parameters
Technical Parameters :
Description
12 kV
36 kV
1 min. power frequency voltage Lighting impulse voltage Rated frequency Short time thermal current for 3 sec Dynamic withstand current Total creepage distance Primary account
28 kV rms 75 kV peak 50 Hz 25 kA rms 62.5 kA peak 300 mm Up to 1250-higher currents can be supplied on demand
70 kV rms 170 kV peak 50 Hz 25 kA rms 62.5 kA peak 900 mm Up to 1600-higher currents can be supplied on demand
Three Phase Pad Transformers are compact power centers for commercial or industrial applications where safety, reliability and aesthetics are especially important. With proper design selection, they can be located near or inside buildings for greater flexibility and savings.
Applications
Industrial, Commercial, Institutional and Residential areas. Indoor Installations like Cellars, Malls, Complexes where safety is of prime concern.
Benefits :
Robust quality systems ensure implementation of the best design and manufacturing practices.
Flexibility in designing transformers to exacting customer requirements (optimum cost).
Competitive delivery schedules.
Best insulation and sealing systems.
Compliance to International Standards like ANSI, IEEE, etc.
Standard Fittings :
Pressure Relief Device
Filling Plug
Liquid Level Guage
Drain Valve with Sampler
Primary Bushings
Secondary Bushings
Hinged Cabinet Doors
Sealed tank Oil Preservation System
Rating and Diagram Plate
Optional Fittings :
Terminal Connectors
LV Distribution Panel
Current Limiting Fuses
Surge Arrester
Bay-o-net Fuses
Elbow Connectors
Magnex
Dial Type Thermometer
Tap Changer
Technical Specification :
Ratings
:
Single Phase : CRGO - Upto 2667 kVA AMT - Upto 8000 kVA Three Phase : CRGO - Upto 2500 kVA AMT - Upto 1000 kVA
Vijai’s Single Phase Oil Filled Distribution Transformers are designed to effectively improve the quality and reliability of the electrical distribution system. Vijai specializes in the manufacture of Pole type Silicon Steel and Amorphous Metal Transformers.
Features and Benefits :
Robust construction having excellent short circuit and thermal withstand capabilities.
Proven technology, effectively improving the quality and reliability of the electrical distribution system
Computer Aided Design (CAD) and Vijai’s Design Software Systems
Ability to meet customized design and specification demands
After sales maintenance and spare parts service
Round Tank for aesthetic appearance
Powder Coated Tank Body – Excellent finish (Optional)
Standard Fittings :
Pole Mounting Brackets
Lifting Lugs
Pressure Relief Device / Self Venting Top Cover
Tank Grounding Provision
Rating and Diagram Plate
Primary Bushings
Secondary Bushings
Optional Fittings :
Lightning Arrester / Arcing Horns
High Voltage Neutral Bushing
Terminal Connectors
Tap changer for external operation
Cable Terminations
Complete Self Protection feature
Technical Specification :
Ratings
:
CRGO Silicon Steel Transformers - Upto 167 kVA Amorphous Metal Transformers - Upto 167 kVA
Siddhi Electronics Exporting, supplying of power transformers such as compendious power transformers, industrial power transformers, electronic transformers, rf wide band transformers and auto-insertion transformers, laser diode modul, diodes, high voltage resisters, relays
Sri Vinayaga Star Electricals Manufacturer of transformers, industrial transformers, power distribution transformers, distribution transformers, earthing transformers, esp transformers, rectifier transformers, wind mill transformers, air cooled transformers and dry transformers.
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