Generator Transformer
Generator Step-up Transformer units are used to increase the voltage of a generator and connect the supply to a bus bar. Generator Transformers are also used to limit the fault level of the generator in case of a fault. Transformers used for these applications are called Generator Step-up Units. These Transformers are designed to operate at near full load.
Generator step-up transformers are manufactured by CG in accordance to the latest applicable national and international standards. Our transformers meet the needs of utility, industrial and commercial customers. Typical generator step-up transformers have cover-mounted primary and secondary bushings. However other configurations can be provided. Every time a fault occurs in the grid, these transformers are subjected to stress. As these transformers are connected to the grid, they are subjected to constant voltage fluctuations. Voltage fluctuations cause stress to the transformer windings. These windings have to be specially designed to withstand these stresses. Localized heating is another issue which is a result of over excitation by the generator during voltage fluctuations. Localized heating can damage the metallic accessories of the transformer. Generator step-up transformers manufactured by CG India have effective low temperature rise.
KEY FEATURES
Better short circuit strength
Compact design
Durability
Optimum losses
Lower footprint
Low temperature rise
Shunt Reactors
In a power transmission system, Shunt Reactors are connected between line terminal and ground. They are used to absorb the reactive power generated in the line, thus optimising a transmission line’s capacity for active power
KEY FEATURES
Compliant with IEC, ANSI, BIS, ISO and other international standards
Customized to customer’s specifications
Capable to withstand extreme environmental conditions
Capable to withstand seismic, wind and ice loads
Capable to withstand transport shocks
Low noise and vibration levels
Low weight and less carbon footprint
Easy assembly with fewer loose parts
Arrangements for worker safety at substations
Compact size requires lower expenditure on civil structures
Easily transportable to remote sites with narrower roads
Transportability through road, rail, sea and air
Advantages
They increase the energy efficiency of the system and improve the quality of the electrical power sup-plied to consumers
To improve the adjustment of the consumed reactive power the reactor can also have a variable rating. Such reactors are called Variable Shunt Reactors
Auto Transformer
Autotransformers are frequently used in power applications to interconnect systems operating at different voltage classes, for example 400 kV to 220 kV for transmission. They are also often used for providing conversions between the two common domestic main voltage bands in the world (400, 200, 66 kV). The links between the UK 400 kV and 275 kV `SuperGrid` networks are normally three-phase autotransformers with taps at the common neutral end. Autotransformers are built with common main winding and a separate low voltage winding.
Autotransformers are often used to step up or step down voltages in the 110-115-120 V range and voltages in the 220-230-240 V range – for example, providing 110 V or 120 V (with taps) from 230 V input, allowing equipment designed for 100 or 120 V to be used with a 230 V supply. This allows US electrical equipment to be fed from the higher European voltage. Autotransformers can also be used to supply European 230 V appliances from a 100 or 120 V supply in countries outside Europe. In all cases the supply and the autotransformer must be correctly rated to supply the required power.
Auto transformers are tailor-made products and the design varies with the impedance levels (constant Ohmic and constant percentage), transmission voltage and cooling requirements. These are normally provided with on load tap changer for voltage variation. For long distance rural power distribution lines, special autotransformers with automatic tap-changing equipment are inserted as voltage regulators, so that customers at the far end of the line receive the same average voltage as those closer to the source. The variable ratio of the autotransformer compensates for the voltage drop along the line.
KEY FEATURES
Better short circuit strength
Compact design
Durability
Optimum losses
KEMA Tested
Epoxy bonded CTC for common winding to improve short circuit withstand strength
Furnace Transformer
various types of furnace transformers like arc furnace and laddle furnace transformers, Mainly the application of electrical air furnace is limited only for melting and refining carried out in next stage. The range of voltages are small for melting operations since furnaces are designed with specific apparent power density in the order of 600-800 kVA / ton. The laddle furnace transformers are used in refining molten steel. The range of voltage required is smaller and lower than those of electrical arc furnace transformers. Normal range arc has low specific apparent average power density in the order of 200-400 kVA / ton. A transformer supplying power to a furnace has to handle extremely high value currents in the order of kAmps. (10 to 60 or higher depending upon furnace ratings).
The furnace transformer thus has special features to handle such high currents as compared to conventional transformers. The electric arc furnace has 3 electrodes connected to the secondary terminals of the furnace transformers. The secondary terminals of the transformers are subject to frequent short circuits during the melting process through the charge and arc. Hence the furnace transformer needs to be specially designed to withstand the frequent short circuits.
KEY FEATURES
Customized designs
High Endurance Capability against Frequent Short Circuits
Unique designs
Optimum losses
Long life
Sustain durability
Locomotive and Trackside Power Transformers
The Locotransformer is used for stepping down the voltage level required for motors used in the railway engines. This transformer has low dimension and weight limits. Height of the unit is reduced by mounting the active part horizontally. We have different range of uniquely designed products like 3900 kVA Foil Wound, 5400 kVA Foil Wound, 6500 kVA for 3-phase Loco, 7500 kVA for 3-phase Loco with advanced design technology to perform seismic and short-circuit conditions, which is developed over the past experiences accompanied with high-end technology for the manufacturing and quality tools for cost-effectiveness for long life with low maintenance.They are designed with H class conductor insulation and filled with silicone oil. To get a compact but reliable design OFAF or ODAF cooling is applied. Height of the unit is reduced by mounting the active part horizonally.
The Trackside Power Transformers are used for stepping down the voltage levels for the railway network. They are used to provide single phase supplies for train overhead systems.
KEY FEATURES
Unique designs
Optimum losses
Long life
Sustain durability
Low maintainance
Short circuit tested Transformers
DT as per IS1180
315 kVA to 4 MVA ; 3.3 kV to 33 kv as per IS: 1180 (BIS) / IS: 2026 (BIS)/IEC 60076.
A distribution transformer is the type of transformer that performs the last voltage transformation in a distribution grid. It converts the voltage used in the transmission lines to one suitable for household and commercial use, typically down to 240 volts.
KEY FEATURES
Automated production resulting in uniform quality by using CNC machines.
No axial force under short circuit condition due to foil construction resulting in increased reliability.
Increased withstand capacity during short circuit due to increase in the surface area of winding.
APPLICATIONS
Industrial Transformers are used in Industries to cater lighting load & load of 3 ph motors
Sub Station Transformers are used in substation to provide electricity to house hold
Multi winding Transformers are used in converter inverter duty application
Low Power Transformer Up To 50 MVA, 132 Class
4MVA to 50 MVA, voltage: up to 132 kV Class. Low power transformers are power transformers that are used to change high voltage i.e. 132 Kv/66 Kv to medium voltage i.e. 33 kV/11 kV. CG has used its in house R&D and engineering capabilities to manufacture low power transformers. The product development team has taken proven technology used in distribution transformers and applied it to LPT. Design features of clamping structures, LV and HV windings, and bushings, as well as cooling techniques have been adapted, enabling CGPISL to manufacture the LPT in a cost-effective way. Units delivering up to 50 MVA have already passed stringent performance tests and are in active service in a variety of applications.
APPLICATIONS
Oil and Gas, Infra – Projects, Mines Metal Minerals, Railways, FMCG, Power Generations, Smarts Cities, SEBs, etc.
Solar Transformer
Up To 12.5 MVA; Voltage Up To 33kV. CG developed Inverters duty transformers for solar applications, which operate at the fundamental frequency of an alternating system. These are designed for one or more output windings connected to the inverters load. Owning to multiple outputs, multiple inverters paralleled to the PV arrays are directly connected to these transformers and reduces the project cost without compromising any of the transformer functions.The transformer`s primary voltage is at the low voltage side and the secondary is at the medium voltage side. The input voltages usually take values 380 V or 400 V and the medium voltage varies according to the feeding network voltage (i.e.11, 33kV).
KEY FEATURES
Proven technology of CG Global design having superior short circuit withstand Capability.
Manufacturing technology with automatic SCADA controlled CNC machines for maintaining process parameters during windings and achieving high quality electric and mechanical connections.
All the ratings are type tested as per IS: 2026.
APPLICATIONS
Solar Power Generation by Photovoltaic System These Inverters duty transformers are the ideal solution for photovoltaic systems. The technology used along with the appropriate sizing of the core, the framework and the high quality materials results in the most suitable product in terms of quality, reliability, efficiency and cost effectiveness.
METRO TRACTION TRANSFORMER
Up To 30.24 MVA; Voltage Up To 132 kV. Traction transformers are critical components in the traction chain, affecting both train performance and operator services. … They can be mounted either in the machine room of the train, on the roof or under the floor, providing maximum flexibility and reliability in single and multiphase systems.
- Traction transformers are critical components in the traction chain, affecting both train performance and operator services.
- CG supplies traction transformers for all applications: locomotives, tram-trains and AC metros offering different designs in terms of size, weight and power ratings.
They can be mounted either in the machine room of the train, on the roof or under the floor, providing maximum flexibility and reliability in single and multiphase systems.
DRY TYPE CAST RESIN TRANSFORMER
100 kVA to 10 MVA; Voltage 0.415 kV to 33 kV. CG cast resin transformers: When safety and performance are paramount CG Cast resin transformers are ideally suited for environments that demand the highest level of fire safety.
APPLICATIONS
- Office & Apartment buildings, to hospitals, underground
- Transport systems, and industrial and off-shore installations Certified safe
Suitable for power ratings from 100 kVA up to 10MVA with operating voltages up to 36 kV, the full product range meets IS 11171 and IEC 60076-11 regulations. These safety certifications guarantee that the transformers:
- Self-extinguish and emit a minimum of fumes in the event of fi re (F1);
- are reliable under conditions of high thermal shock (C2);
- Perform well in damp, dusty, salty and polluted environments (E2).
Bio Transformers up to 132 KV Class
250 kVA to 50 MVA; Voltage 3.3 kV to 132 kV. Safer and ecofriendly. One of the key benefits offered by the green power transformers is the prevention of pollution using ester oil instead of mineral oil. Mineral oil is used in conventional transformer design which comes from natural resources after processing of the mother earth raw materials taken from mine
- Updated electrical design due to permittivity changes.
- Tailored cooling design due to viscosity changes.
- Experimentally validated in house design software.
- Adapted procedures for impregnation & oil filling process.
- Up gradation of manufacturing technology.
- Cost effective and reliable transformers.
APPLICATIONS
In ecologically sensitive locations
Specific regulations apply.
Near rivers and lakes.
Near drinking and groundwater reserves.
Near crowded place
Industrial Transformers used in Industries to cater lighting load & load of 3 ph motors