Product Range

Instrument Transformers for India's Power Infrastructure

Current Transformers (CTs) up to 400 kV and Inductive Voltage Transformers (IVTs/PTs) up to 220 kV, with MV products from 11 kV. Outdoor OIP insulated, epoxy resin cast, live tank and dead tank designs conforming to IS 16227 / IEC 61869.

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HV CT

High Voltage Current Transformers

Outdoor OIP Insulated · Up to 400 kV · IS 2705 / IS 16227 / IEC 61869

Porcelain/Polymer Insulator

Nitrogen Cushion or SS Bellow

Epoxy Block Secondary Terminal

Up to 6 Cores

PS, Metering (0.2S), Protection

Custom per state board specs

High voltage current transformers for outdoor installations in power substations and transmission networks. Designed for accuracy and reliability in demanding industrial environments.

Technical Specifications

Parameter	Unit	132 kV	220 kV	400 kV
Applicable Standard	—	IS 2705 / IS 16227 / IEC 61869
Rated Frequency	Hz	50/60
HSV	kV	145	245	420
1 Min PF	kV	275	460	630
Lightning Impulse	kVp	650	1050	1425
Switching Impulse	kVp	—	—	1050
Primary Current	A	≤3000	≤4000	≤4000
Secondary Current	A	1 or 5	1	1
Cores	—	4–5	4–5	4–6
STC/Duration	kA/s	40/1	50/1	63/1
Creepage	mm	3625	6125	10500
Arcing	mm	1200	2040	3155

MV CT

Medium Voltage Current Transformers

Outdoor OIP Insulated · Up to 66 kV

3-Phase Bushings

Up to 3000A Primary

STC up to 40 kA

Porcelain/Polymer

Medium voltage current transformers designed for outdoor installations in distribution networks and industrial substations. Precision-engineered for accurate current measurement and protection.

Technical Specifications

Parameter	Unit	11 kV	33 kV	66 kV
Applicable Standard	—	IS 2705 / IS 16227 / IEC 61869
Rated Frequency	Hz	50/60
Insulator	—	Porcelain / Polymer
HSV	kV	12	36	72.5
1 Min PF	kV	28	70	140
Lightning Impulse	kVp	75	170	325
Primary Current	A	≤3000	≤3000	≤3000
Secondary Current	A	1 or 5	1 or 5	1 or 5
STC/Duration	kA/s	31.5/1	31.5/1	40/1
Creepage	mm	300	900	1815
Arcing	mm	150	300	600

HV IVT / PT

High Voltage Inductive Voltage Transformers

Outdoor OIP Insulated · Up to 220 kV · IS 3156 / IS 16227 / IEC 61869

Single Bushing Design

Secondary 110V/√3

0.2 Class Accuracy

Porcelain/Polymer

Oil Compensation via Bellow

High voltage potential transformers for precision voltage measurement in power transmission systems. Engineered for high accuracy and long-term reliability in challenging environmental conditions.

Technical Specifications

Parameter	Unit	132 kV	220 kV
Applicable Standard	—	IS 3156 / IS 16227 / IEC 61869
Rated Frequency	Hz	50/60
Rated Voltage Factor	—	1.2 cont. / 1.5 × 30 s
HSV	kV	145	245
1 Min PF	kV	275	460
Lightning Impulse	kVp	650	1050
Secondary Voltage	V	110/√3	110/√3
Accuracy Class	—	0.2	0.2
Thermal Burden	VA	300	400
Creepage	mm	3625	6125
Arcing	mm	1300	2065

MV IVT / PT

Medium Voltage Inductive Voltage Transformers

Outdoor OIP Insulated · Up to 66 kV

Single Bushing

110V/√3 Secondary

0.2 Class

Porcelain/Polymer

Medium voltage potential transformers designed for distribution networks and industrial substations. Provides accurate secondary voltage for metering and protection systems.

Technical Specifications

Parameter	Unit	11 kV	33 kV	66 kV
Applicable Standard	—	IS 3156 / IS 16227 / IEC 61869
Rated Frequency	Hz	50/60
Rated Voltage Factor	—	1.2 cont. / 1.5 × 30 s
Insulator	—	Porcelain / Polymer
HSV	kV	12	36	72.5
1 Min PF	kV	28	70	140
Lightning Impulse	kVp	75	170	325
Secondary Voltage	V	110/√3	110/√3	110/√3
Accuracy Class	—	0.2	0.2	0.2
Thermal Burden	VA	100	300	200
Height Range	mm	500–650	900–1000	—

Resin Cast

Resin Cast CT & PT

Indoor / Outdoor · Up to 33 kV

Up to 33 kV

Maintenance-Free

Indoor/Outdoor

Solid Insulation

Weather-Resistant

Resin cast instrument transformers offer maintenance-free operation for both indoor and outdoor installations. Solid insulation provides enhanced durability and environmental resistance.

Technical Specifications

Parameter	Unit	11 kV	33 kV
Applicable Standard	—	IS 2705 / IS 3156 / IS 16227 / IEC 61869
Operating Voltage	kV	3.6 / 7.2 / 12	24 / 36
CT Type	—	Block / Window / Bar
PT Type	—	Single & Double Pole
Secondary Current (CT)	A	1 or 5
Secondary Voltage (PT)	V	110/√3
Rated Frequency	Hz	50/60
Insulation	—	Cast Resin (epoxy)

Combined CTPT

Combined CT-PT Units

Outdoor Installation · Up to 33 kV

Integrated CT & PT

Space-Efficient Design

Outdoor Rated

Single Support Structure

Up to 33 kV

Integrated current and potential transformer units combining both measurement elements in a single installation. Reduces space requirements and simplifies system design for distribution substations.

Technical Specifications

Parameter	Unit	11 kV	33 kV
Applicable Standard	—	IS 2705 / IS 3156 / IS 16227 / IEC 61869
HSV	kV	12	36
1 Min PF Withstand	kV	28	70
Lightning Impulse	kVp	95	170
Rated Frequency	Hz	50/60
Total Creepage	mm	300	900
Secondary Current (CT)	A	1 or 5
Secondary Voltage (PT)	V	110/√3
Voltage Factor	—	1.2 cont. / 1.5 × 30 s

Metering Cubicle

Metering Cubicles

Indoor / Outdoor · Up to 33 kV

Pre-Assembled

Integrated Metering

Indoor/Outdoor

Up to 33 kV

Factory-Tested

Complete metering cubicles integrating instrument transformers with panel-mounted metering equipment. Provides a compact, pre-assembled solution for revenue metering applications in distribution networks.

Technical Specifications

Parameter	Unit	11 kV	33 kV
Applicable Standard	—	IS 2705 / IS 3156 / IS 16227 / IEC 61869
HSV	kV	12	36
1 Min PF Withstand	kV	28	70
Lightning Impulse	kVp	95	170
Rated Frequency	Hz	50/60
Total Creepage	mm	300	900
Secondary Voltage (PT)	V	110/√3
Configuration	—	3-Phase Outdoor

Instrument Transformers for India's Power Infrastructure

High Voltage Current Transformers

Medium Voltage Current Transformers

High Voltage Inductive Voltage Transformers

Medium Voltage Inductive Voltage Transformers

Resin Cast CT & PT

Combined CT-PT Units

Metering Cubicles

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