33kV Current Transformer Manufacturer in India
AMREST manufactures single phase 33kV Current Transformers in single bushing and double bushing designs for metering and protection, for substations, switchyards, distribution systems, industrial and EPC projects across India. CT ratio, cores, accuracy class and burden are defined with you, based on your approved datasheet, single-line diagram or BOQ.
What is a 33kV Current Transformer?
A 33kV CT is an instrument transformer that reduces the large primary current in a 33kV line to a much smaller, proportional secondary current that meters and relays can handle. Line currents at 33kV are far too high for these devices, and they cannot be exposed to line voltage. A CT solves both problems: it scales the current down and isolates the low-voltage secondary from the high-voltage primary. Its primary winding is connected in series with the line, and the secondary delivers current in a fixed ratio.
Metering
Feeds energy meters used for billing and energy accounting.
Protection
Feeds relays that detect overloads and faults and initiate tripping.
Monitoring
Feeds ammeters, power analysers and SCADA inputs for load tracking.
Each role has different accuracy and performance requirements, so the CT must be specified for the duty it will perform.
Single bushing and double bushing CTs
33kV Single Phase Single Bushing CT
Single phase unit with a single bushing primary arrangement, insulated for 33kV class service, with secondary terminals for the required cores. Built with metering cores, protection cores or both.
- Incoming and outgoing feeder bays
- Transformer bays in substations
- Switchyards and outdoor 33kV structures
- Industrial 33kV distribution points
- Renewable energy collector substations
33kV Single Phase Double Bushing CT
Single phase unit with a double bushing primary arrangement, giving the designer a defined primary terminal layout. Used where the project layout or connection method calls for this configuration.
- Substations and switchyards
- Feeder circuits
- Industrial networks
- Metering cores, protection cores or both
- Ratio, cores, class, burden and mounting agreed before manufacture
Single bushing vs double bushing 33kV CT
Both types are single phase 33kV CTs and can be used for metering and protection. The choice usually depends on the project layout and the datasheet.
| Aspect | Single Bushing CT | Double Bushing CT |
|---|---|---|
| Construction | Single bushing primary arrangement | Double bushing primary arrangement |
| Connection | As per single bushing drawing | As per double bushing drawing |
| Application | Substations, switchyards, feeders, industrial networks | Substations, switchyards, feeders, industrial networks |
| Installation check | Terminal position, clearances and mounting | Terminal positions, clearances and mounting |
| Metering / protection | As per core specification | As per core specification |
| Customisation | Ratio, cores, class and burden per project | Ratio, cores, class and burden per project |
If your specification does not state the type, share your layout and our team will help confirm.
Metering and protection CTs
33kV Metering Current Transformer
Reproduces the primary current faithfully at normal loads, so energy and load data are recorded correctly. Accuracy class is set by the utility or project; burden is matched to the meter and wiring. See our 33kV metering CT PT range.
- Revenue and tariff metering at incomers and feeders
- Energy audit and internal sub-metering
- Trivector and multifunction meters
- Power analysers and load monitoring
- SCADA and energy management inputs
33kV Protection Current Transformer
Stays dependable when circuit current is far above normal, as during a fault. Protection class and burden depend on the relay type, fault level and scheme.
- Overcurrent and earth fault relays
- Differential protection schemes
- Directional, distance and busbar protection
- Transformer and feeder protection
- 33kV switchgear and substation bays
33kV CT technical specification
| Parameter | Specification |
|---|---|
| Product | 33kV Current Transformer |
| Voltage class | 33kV |
| Phase | Single phase |
| Type | Single bushing / Double bushing |
| Application | Metering / Protection |
| Primary current | As per customer requirement |
| Secondary current | As per approved project specification |
| Number of cores | As per requirement |
| Accuracy class | As per application |
| Rated burden | As per customer / project specification |
| Frequency | As per project specification |
| Insulation level | As per approved technical requirement |
| Customisation | Available |
| Brand / origin | AMREST, India |
Detailed ratings, standards and test documentation are confirmed in the technical offer and approved datasheet for each project.
Built around your specification
- CT ratio and primary / secondary current
- Metering core: accuracy class and burden
- Protection core: protection class and burden
- Number of cores and burden per core
- Single or double bushing
- Mounting, terminals, documentation and delivery
Specified, not picked from a shelf
- Project-specific manufacturing around your datasheet
- Requirement-based production: ratio, cores, class and burden confirmed first
- B2B and EPC support: technical clarifications and quotation support
- One source: 11kV CTs, 11kV and 33kV PTs, distribution and power transformers
- Domestic and export enquiries welcome
Where they are used
- Electrical substations
- Switchyards
- Power distribution systems
- Industrial power networks
- Transformer protection
- 33kV switchgear
- Utility projects
- Solar power projects
- Wind energy projects
- Renewable energy substations
- EPC infrastructure projects
How to enquire
We support EPC contractors, electrical consultants, utilities, industrial buyers, distributors, infrastructure companies and procurement departments.
Send BOQ
Or your CT schedule and datasheet.
Technical offer
We review and confirm the configuration.
Commercial quote
Priced for your project quantity.
Delivery
Share site location and schedule, including phased delivery.
33kV Current Transformer price in India
There is no single 33kV CT price, because cost depends on the specification. Send us as many of these as you have:
Supply across India and export
Buyers from any region of India can send an enquiry for utility substations, industrial plants or renewable energy sites. International buyers can share the destination country, applicable standards, required documentation, quantity and timeline; export enquiries are reviewed individually.
- India
- United Arab Emirates
- Saudi Arabia
- Bahrain
- Iraq
- Kuwait
- Oman
- Qatar
- South Africa
- Zambia
- Tanzania
- Ghana
- Nepal
- Bhutan
- Bangladesh
- Indonesia
- Kenya
- Malaysia
- Turkey
- Zimbabwe
- and other countries
Frequently asked questions
What is a 33kV Current Transformer?
An instrument transformer for 33kV circuits that reduces high primary current to a proportional, lower secondary current for meters and relays.
What is the purpose of a 33kV CT?
Safe and accurate current measurement, energy metering and relay protection, while isolating instruments from the high-voltage line.
Who manufactures 33kV CTs in India?
AMREST manufactures 33kV single phase single bushing and double bushing CTs for metering and protection to customer specifications.
Single vs double bushing CT?
The difference is in the primary bushing construction and connection arrangement. Choice depends on layout, datasheet and installation.
What is a metering CT?
A CT that feeds energy meters and instruments, specified for accuracy at normal load current.
What is a protection CT?
A CT that feeds relays, specified to stay dependable at high fault currents so protection operates correctly.
Can 33kV CT ratios be customised?
Yes. Ratio, cores, accuracy class and burden can be customised as per project requirement.
Can customers submit their own specifications?
Yes. Send your datasheet, single-line diagram or CT schedule and we will review it before quoting.
Can AMREST support bulk / EPC requirements?
Yes. Send your BOQ, datasheet and quantity for a technical and commercial offer.
Can AMREST handle export enquiries?
Yes. Share the destination country, standards, documents and quantity for review.