CURRENT TRANSFORMER

GENERAL DESCRIPTION

Instrument transformers (ITRs) are designed to transform voltage or current from a high value in thetransmission and distribution systems to a low value that can be utilized by low voltage metering devices. There areprimary applications for which ITRs are used: metering (for energy billing and transaction purposes) and protectioncontrol (for system protection and protective relaying purposes). Typical output levels of instrument transformersare 1-5 amperes and 63.5, 110, 190 volts for CTs and VTs, respectively. There are several classes of accuracy forinstrument transformers defined by the IS, IEEE, IEC, and ANSI standards.

CURRENT TRANSFORMER

Construction Type Indoor/Outdoor

LV - Resin cast, Tape wound, Moulded case, Cycloaliphatic

Window (Ring & Rectangular)

Wound Primary Type(WPL)

Bar Primary Type(BPL)

System Voltage Up to 33kV

Rated Primary Current(A) Up to 75,000Amps

Rated Secondary Current(A) 1A or 5A

Metering class 1,0.5,0.5s,0.2,0.2s,0.1

Protection Class 5P-15P , ALF 5-30

Rated Burden (VA) Up to 50VA

Special Protection(PS) As per Customer Requirement

Number of cores 1 or more

Rated Frequency(Hz) 50Hz-400Hz

Class of insulation A,B,F and H

Standards IS,IEC,ANSI,BS,etc.

Type

Construction Type

TECHNICAL SPECIFICATION FOR CURRENT TRANSFORMER

MV-3.3kV to 33kV Indoor-Epoxy Resin Outdoor- Cycloaliphatic ,Oil-Cooled

KALPA ELECTRIKAL PVT. LTD.P.B. No. 4413, 149/25, III Main, Industrial Town, Rajajinagar, Bengaluru – 560 010 (INDIA)

Phone: +91-80-23405248, 23303103 Email: [email protected] Web: www.kalpaelectrikal.com

VOLTAGE TRANSFORMER

Construction Type Indoor/Outdoor

LV(Resin cast ,VPI)

MV-3.3kV to 33kV Indoor-Epoxy Resin Outdoor-cycloaliphatic ,Oil-Cooled

Rated Frequency(Hz) 50Hz-400Hz

System Voltage Up to 33kV

No of Phases 1 Phase & 3 Phase

Rated Primary voltage (V) As per Customer requiremment

Rated Secondary Voltage(V) As per Customer requiremment

Metering Class 3,1,0.5,0.2,0.1

Protection Class 3P & 6P

Residual Protection 5PR

Burden (VA) Up to 500VA

Number of Windings 1 or More

Class of insulation A,B,F and H

System Earthing One end earthed Type and Un-earthed Type

Standards IS,IEC,ANSI,BS,etc.

TECHNICAL SPECIFICATION FOR VOLTAGE TRANSFORMER

Type

OIL IMMERSED DISTRIBUTION TRANSFORMER

Kalpa Electrikal Pvt Ltd manufactures both hermetically sealed corrugatedradiator type and conventional rectangular tank type distribution Transformers. TheseTransformers are generally used in the distribution network for feeding residential,commercial & bulk consumers.

TECHNICAL SPECIFICATIONS

Duty, Type Outdoor / Indoor, Pole or Ground MountedVoltage Class 3.3, 6.6, 11, 22, 33 kV or any specificNo of Phases 1 or 3 PhaseFrequency 50/60 HzVector Group Dyn1 or Dyn5 or Dyn11 or any specific

Insulating FluidPCB FREE Mineral Oil, both inhibited & uninhibited, as per IS335/IEC60296, and customer requirement.

Class of Insulation Class A

Tap Changer Off Circuit or On Load

Tapping Range±2.5% X 2 for OCTC or + 1.25% X 4 & - .25% X 8 for OLTC or as per customer requirement

Winding Material Aluminum or Copper with multi paper covering

Applicable Standards

IS 1180 ,IS 2026, IEC 60076, ANSI, IEEE

PaintingEnamel, Epoxy, Polyurethane or customer specific

ASSURED FEATURES

• Highest dielectric insulation property to withstandLightening Impulse

• Mechanical design to withstand short circuit forcesarising during faults

• Optimum oven heating under vacuum as to achievedesired compression height and maximum insulationresistance (IR) to windings

• Adequate ducts between layers, coils, discs formaximum oil flow and reduced hot spottemperature.

• Step-lap designed CRGO laminations for lowerlosses and excitation current

• Pre-compressed Insulation material for minimalmoisture absorption



OIL IMMERSED DISTRIBUTION TRANSFORMER

IS1180, 11 kV distribution transformer (Off Circuit Type).

a) Three phase distribution transformers up to and including 200KVA, 11KV Class

Sl. No.

Rating (KVA) % Z

Energy Efficiency Level 1



@ 50% @ 100% @ 50% @ 100% @ 50% @ 100%

1 16KVA 4.5% 150W 480W 135W 440W 120W 400W

2 25KVA 4.5% 210W 695W 190W 635W 175W 595W

3 63KVA 4.5% 380W 1250W 340W 1140W 300W 1050W

4 100KVA 4.5% 520W 1800W 475W 1650W 435W 1500W

5 160KVA 4.5% 770W 2200W 670W 1950W 570W 1700W

6 200KVA 4.5% 890W 2700W 780W 2300W 670W 2100W

b) Three phase distribution transformers Higher than 200KVA up to and including 2500KVA, 11KV Class

Sl. No.

Rating (KVA)

% Z Energy Efficiency Level 1


Energy EfficiencyLevel 3

@ 50% @ 100% @ 50% @ 100% @ 50% @ 100%

1 250KVA 4.5% 1050W 3150W 980W 2930W 920W 2700W2 315KVA 4.5% 1100W 3275W 1025W 3100W 955W 2750W

3 400KVA 4.5% 1300W 3875W 1225W 3450W 1150W 3330W

4 500KVA 4.5% 1600W 4750W 1510W 4300W 1430W 4100W

5 630KVA 4.5% 2000W 5855W 1860W 5300W 1745W 4850W

6 1000KVA 5.0% 3000W 9000W 2790W 7700W 2620W 7000W

7 1250KVA 5.0% 3600W 10750W 3300W 9200W 3220W 8400W

8 1600KVA 6.25% 4500W 13500W 4200W 11800W 3970W 11300W

9 2000KVA 6.25% 5400W 17000W 5050W 15000W 4790W 14100W

10 2500KVA 6.25% 6500W 20000W 6150W 18500W 5900W 17500W

STANDARD FITTINGS• H. V & L. V. Bushing• Off Circuit Tap Changer• Conservator oil filling hole With cap & drain plug• Undercarriage with four Bi-directional rollers• Earthling terminals & Additional Neutral bushing• Drain cum bottom filter Valve with sampling plug• Top filter valve with Sampling plug• Plain Oil Level Gauge• Rating diagram plate• Air release device• Thermometer Pocket• Lifting Lugs• Pressed Steel Radiators (Fins or corrugated type)• Double Diaphragm explosion vent• Silica gel breather

OPTIONAL FITTINGS• Detachable Radiators with isolating valves• Jacking Pads• Dial type Oil Temperature Indicator With A/T contacts• Dial type Winding Temperature Indicator with A/T

contacts• Magnetic Oil Gauge with A/T contacts• Buchholz relay with A/T contacts• Marshaling box with control wiring• Equalizer pipe between Conservator & explosion vent• On Load Tap Changer• RTCC Panel with automatic Voltage Regulator (AVR)• Pressure Release valve• DGPT Relay

DRY TYPE RESIN CAST TRANSFORMER

At Kalpa Electrikal Pvt Ltd, casting method of these transformers is obtained with thecombined action of vacuum and temperature. The casting method makes it possible to assure void-freeepoxy penetration of both the inner layer and between turn insulation. These Transformers arespecifically needed in the distribution network for feeding basements or stilts of high-rise buildings,hotels, Malls, stadium, Airports, Steel, Cement, Chemical & Refinery plants.


ASSURED FEATURES

• Windings are electrically balanced to minimizeaxial short circuit forces

• Coils are held rigidly in place between insulatorsclamped to the upper and lower core frames underhigh compression

• Precise casting under vacuum ensuring low partialdischarge

• Smooth surface finish and robust construction ofMV & LV cast Coils

• Adequate ducts between coils, discs for maximumair flow and reduced hot spot Temperature

• Step-lap designed CRGO laminations for lowerlosses and excitation current

Duty Type Outdoor / Indoor , Convertor Duty, Special Type

Voltage Class UPTO 33 kVNo of Phases 1 Phase or 3 Phase

Frequency 50/60 Hz

Vector GroupDyn1 or Dyn5 or Dyn11 or any other connection as per customer requirement.

Class of Insulation Class B/F/H with Temp Rise of 70/90/115 DegC or as per customer requirement.

Tap Changer Off Circuit or On Load.

Tapping Range± 2.5% X 2 for OCTC or + 2.5% X 2 & - 2.5% X6 for OLTC or as per customer. requirement

Winding Material Copper

Applicable Standards IS 11171, IEC 60076

PaintingPowder coated with RAL 7032 shade or as per customer requirement

Degree of protection IP 23,43 or as per customer requirement.



RESIN CAST TRANSFORMER

STANDARD FITTINGS

OPTIONAL FITTINGS

• RTD with A/T contact• Marshaling box with control wiring• On Load tap changer• Forced Cooling arrangement• Neutral Current Transformer

• H.V. Cable box.• L.V. Cable box with bus bar or bus duct• Off circuit tap links• Undercarriage with four Bi-directional rollers• Earthing terminals• Rating and diagram plate• Lifting lugs for complete Transformer• Tapping link operation door• Enclosure with louvre panels• Canopy• Base channel – 2 Nos• The separate neutral bushing on LV side• Paint: Powder coated With RAL7032 Shade

PRODUCT DIAGRAM

SAFETY FEATURES

• Environment-Friendly• Fire Resistance• Non-Hygroscopic

VACUUM PRESSURE IMPREGNATEDTRANSFORMER

We Kalpa Electrikal Pvt Ltd manufacture conventional open enclosure type vacuum pressureimpregnated dry Transformers. These Transformers are specifically needed in the distribution networkfor feeding basements or stilts of high-rise buildings, hotels, Malls, stadium, Airports, Steel, Cement,Chemical & refinery plants.


ASSURED FEATURES

• Windings are electrically balanced to minimize axial shortcircuit forces

• Coils are held rigidly in place between insulators clampedto the upper and lower core frames under high compression

• Precise casting under vacuum ensuring low partialdischarge

• Smooth surface finish and robust construction of MV &LV cast Coils

• Adequate ducts between coils, discs for maximum air flowand reduced hot spot Temperature

• Step-lap designed CRGO laminations for lower losses andexcitation current

Duty Type Outdoor / Indoor, Ground Mounted AN/AF

Voltage Class Upto 11 kV

No of Phases 1Phase or 3 Phase

Frequency 50/60 Hz

Vector Group Dyn1 or Dyn5 or Dyn11 or any specific

Class of InsulationClass B/F/H with Temp Rise of 70/90/115Deg C or as per customer requirement

Tap Changer Type Off Circuit or On Load

Tapping Range ±2.5% X 2 for OCTC or + 2.5% X 2 & - 2.5% X6 for OLTC or as per customer requirement

Winding Material Copper

Applicable Standards

IS 11171, IEC 60076

Enclosure Painting Powder coated with RAL 7032 shade or asper customer requirement

Degree of protection

IP 23,43 or as per customer requirement.



VACUUM PRESSURE IMPREGNATEDTRANSFORMER

STANDARD FITTINGS

OPTIONAL FITTINGS• RTD with A/T contact• Marshaling box with control wiring• On Load tap changer with RTCC Panel

with AVR• Forced Cooling arrangement• Neutral Current Transformer• Space heaters for core & windings

• H.V. Cable box.• L.V. Cable box with bus bar or bus duct• Off circuit tap links• Undercarriage with four Bi-directional rollers• Earthing terminals• Rating and diagram plate• Lifting lugs for complete Transformer• Tapping link operation door• Enclosure with louvre panels• Canopy• Base channel – 2 Nos• The separate neutral bushing on LV side• Paint: Powder coated With RAL7032 Shade

SAFETY FEATURES• Environment-Friendly• Fire Resistance• Non-Hygroscopic

PRODUCT DIAGRAM

Documents

CURRENT TRANSFORMER