EMMESS CONTROL PVT. LTD. Chennai, Tamil Nadu

Emmess's range of OIP Insulated Instrument Transformers use Oil Impregnated Paper Insulation and are designed for serving in Outdoor applications, with several unique features with one aim - TOTAL RELIABILITY. Our present range of OIP Current Transformers include CTs from 12 kV to 220 kV as per International Standards (IEC).

Design

Emmess's OIP insulated outdoor products are subjected to extreme climatic conditions at Customer Sites and hence Quality and Reliability have been built into the Product, right from the design stage and are followed up through established manufacturing processes, rigorous In-process Quality checks and the designs validated by exhaustive type testing and satisfactory field performance.

Emmess's design philosophy aims at the following aspects :

• True Hermetic Sealing ensures that the OIP Insulation retains the original properties even after several years of field operations;
• Our products are well engineered, our processes are well established. These factors ensure high reliability of our products whilst in service.
• Our products are truly maintenance-free; hence, only periodical cleaning of the products is required.
• Our products are designed to be user-friendly - right from unpacking, handling, erection, testing, commissioning and day to day operations in the field.
• Safety has been built into our products. Even in the unlikely event of an internal failure, the Instrument Transformer DOES NOT SHATTER or explode. A corrugated Stainless Steel Diaphragm has been provided, which, besides lending compensating volume for oil expansions during normal operations, acts as a proven pressure relief device, by peeling off from the tank from the weld and thus averts any explosion of the porcelain insulator.

Design Highlights

• Thin Mild Steel Tank - leads to low Eddy Current in the CT tank and hence low heating even at higher currents.
• Thin Mild Steel Tank - Resilience effect - Absorbs mechanical shocks on primary terminals.
• Lumped Primary Winding with rectangular copper strips - Highest mechanical strength during Short Circuit conditions, thus gives high Dynamic Current withstand-ability.
• Specially designed rectangular copper lugs for CT primary winding terminations provide strong and reliable joints and no hot spots.
• Capacitive graded Insulation is provided in the secondary lead out bushing. This ensures uniform voltage distribution and partial discharge free performance ensuring longer life of the product.
• Crimped joints are provided on secondary leads. This averts loose connections possible in fastened joints.
• Cemented flanges are used on Porcelain Insulator. This results in uniform mechanical stress distribution on the elastomer gasket - joints and hence minimizes the prospects of any oil leakage.

Process Highlights

• Major Paper insulation is dried in autoclaves, as per proven cycles under controlled vacuum and temperature.
• The EHV grade transformer oil is degassed and filtered until the desired properties are achieved.
• Each Instrument Transformer is pneumatically pressure tested at 1 kg/cm2 (gauge) at various assembly stages in order to assure the effectiveness of sealings provided.
• After oil flooding, each unit is hydraulically pressurized at 1 kg/cm2 (gauge) and maintained under pressure for 6 hours to ensure complete and homogeneous soaking of paper with oil and also checks effectiveness of sealings.
• Our products are adequately treated for corrosion resistance.
• Uniform Insulation thickness with capacitive graded Condenser Bushing is used in all Current and Voltage transformers from 12 kV up to 220 kV Class.

Tests And Performance

All Product designs have been validated by type-tests as per applicable IEC Standards.

Emmess's range of OIP Insulated Instrument Transformers use Oil Impregnated Paper Insulation and are designed for serving in Outdoor applications, with several unique features with one aim - TOTAL RELIABILITY. Our present range of OIP Current Transformers include CTs from 12 kV to 220 kV as per International Standards (IEC).

Design

Emmess'sOIP insulated outdoor products are subjected to extreme climatic conditions at Customer Sites and hence Quality and Reliability have been built into the Product, right from the design stage and are followed up through established manufacturing processes, rigorous In-process Quality checks and the designs validated by exhaustive type testing and satisfactory field performance.

Emmess's design philosophy aims at the following aspects :

• True Hermetic Sealing ensures that the OIP Insulation retains the original properties even after several years of field operations;
• Our products are well engineered, our processes are well established. These factors ensure high reliability of our products whilst in service.
• Our products are truly maintenance-free; hence, only periodical cleaning of the products is required.
• Our products are designed to be user-friendly - right from unpacking, handling, erection, testing, commissioning and day to day operations in the field.
• Safety has been built into our products. Even in the unlikely event of an internal failure, the Instrument Transformer DOES NOT SHATTER or explode. A corrugated Stainless Steel Diaphragm has been provided, which, besides lending compensating volume for oil expansions during normal operations, acts as a proven pressure relief device, by peeling off from the tank from the weld and thus averts any explosion of the porcelain insulator.

Design Highlights

• Thin Mild Steel Tank - leads to low Eddy Current in the CT tank and hence low heating even at higher currents.
• Thin Mild Steel Tank - Resilience effect - Absorbs mechanical shocks on primary terminals.
• Lumped Primary Winding with rectangular copper strips - Highest mechanical strength during Short Circuit conditions, thus gives high Dynamic Current withstand-ability.
• Specially designed rectangular copper lugs for CT primary winding terminations provide strong and reliable joints and no hot spots.
• Capacitive graded Insulation is provided in the secondary lead out bushing. This ensures uniform voltage distribution and partial discharge free performance ensuring longer life of the product.
• Crimped joints are provided on secondary leads. This averts loose connections possible in fastened joints.
• Cemented flanges are used on Porcelain Insulator. This results in uniform mechanical stress distribution on the elastomer gasket - joints and hence minimizes the prospects of any oil leakage.

Process Highlights

• Major Paper insulation is dried in autoclaves, as per proven cycles under controlled vacuum and temperature.
• The EHV grade transformer oil is degassed and filtered until the desired properties are achieved.
• Each Instrument Transformer is pneumatically pressure tested at 1 kg/cm2 (gauge) at various assembly stages in order to assure the effectiveness of sealings provided.
• After oil flooding, each unit is hydraulically pressurized at 1 kg/cm2 (gauge) and maintained under pressure for 6 hours to ensure complete and homogeneous soaking of paper with oil and also checks effectiveness of sealings.
• Our products are adequately treated for corrosion resistance.
• Uniform Insulation thickness with capacitive graded Condenser Bushing is used in all Current and Voltage transformers from 12 kV up to 220 kV Class.

Tests And Performance

All Product designs have been validated by type-tests as per applicable IEC Standards.

ECP''s Power Transformer range extends up to 780 MVA, 400kV class, catering to various application needs as shown under

Most advanced software packages are used for design verification to ensure high standard of product reliability in service. The state-of-the-art power transformer manufacturing plant is equipped with sophisticated facilities such as Vertical Winding machines, Vapour Phase Drying Process Plants and 200T EOT crane, besides advanced testing facilities and a modern Oil testing facility. A modern in-house tank fabrication facility ensures aesthetics and painting quality of fabricated items.Further in order to ensure consistent product quality , well documented systems are in place defining standard operating procedures and process norms, matching world class industry practices. ECPL has successfully carried out short-circuit test on various capacity transformers covering upto 315 MVA, 220kV Generator Transformer, 315MVA, 400kV Auto Transformer and 42MVA, 220kV Traction Transformer. ECPL has been persistent towards meeting international quality standards and has developed the expertise for supplying transformers conforming with various international standards like IEC, ANSI, DIN, SANS etc.

Indoor Applications

Emmess manufactures a wide range of PTs (Single Phase and Three Phase) available from 11 kV to 36 kV. Potential Transformers are cast using a liquid resin system with plasticizer processed under vacuum at controlled temperatures. All PTs have been type tested as per latest revision of IEC . PT designs are tailor-made to suit customer requirements for specific applications.

Copper wire is used for both windings. Primary is wound over FRP tube or Epoxy tube. It is multilayered and is of Trapezoidal design. The length of each winding layer is designed such that service and impulse voltage is distributed equally throughout, adequate to prevent interturn and interlayer shorts. Separate designs are available for both single Phase and three Phase VT's and also with provision for providing primary fuse.

Product Features

• Manufactured using high grade of Epoxy Resin System
• Suitable for temperature range -40 C to +80 C.
• High mechanical stability of the winding and high strength against impulse and surge voltages.
• high mechanical strength against the forces developed during dynamic currents.

Emmess Manufactures DryType Cast Resin Transformers , casted coils are well known for their extremely low levels of Partial discharge.

ApplicationIn 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.
• Emmess 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

We manufacture a range of Distribution Transformers suitable for use in Utilities and industries. Distribution Transformers ranging between 100KVA /11KV & 3150KVA/33KV with various options and features are custom-made as per customers requirement. These transformers are manufactured at our Thirumazhisai plant in Chennai.

Standard Fittings :

• Pole Mounting Brackets/Tanks Base Channels
• Lifting Lugs
• Tank grounding Provision
• Rating and Diagram Plate
• Primary Bushings
• Secondary Bushings

Optional Fittings :

• Lightening Arrester
• Conservator
• HV/LV cable box, Bus Duct
• Oil Temperature Indicator
• Buchholz Relay (for ratings above 1000 KVA)
• Pressure Relief Device / Explosion Vent
• Terminal Connectors
• Tap Changer
• Arcing Horns
• Cable Terminations

We manufacture a range of Single Phase Oil Filled Distribution Transformers are designed to effectively improve the quality and reliability of the electrical distribution system.

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 Emmess 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

'EMMESS' manufactures a wide range of LT current Transformers to suit Industrial dimensional standards and specific customer requirement.

They include

• LT tape insulated Current Transformer ( Varnished Cotton Tape/Fibre glass tape & PVC Tape ) with/ without fixing dimensions.
• LT Resincast Current Transformer (Ring Type/Rectangular Type, wound primary type)
• Hylam Mounted Wound primary Current Transformer.
• Lab grade Precision current transformers
• Bushing/ Bus duct current Transformers
• Summation current Transformer
• Core balance current transformers