33kV Metering CT PT Manufacturer in India
Amrest Electricals Limited manufactures 33kV Metering Current Transformers (CT) and Potential Transformers (PT) for accurate energy measurement and revenue metering, built to customer, utility and tender specifications.
33kV metering instrument transformers
33kV Metering Current Transformer
Converts high primary current to a standard 1A or 5A secondary for energy meters. Designed for high accuracy at normal load and to saturate during faults, protecting the meter.
- Accuracy class 0.2S, 0.5S, 0.2 or 0.5
- Controlled instrument security factor
- Single or multi-ratio designs
- Insulation designed for 36kV class systems
33kV Metering Potential Transformer
Also called a Voltage Transformer (VT). Steps 33kV down to a standard 110V or 110V/√3 secondary for meters and monitoring equipment.
- Accuracy class 0.2 or 0.5
- Typical ratio 33kV/√3 : 110V/√3
- Single-phase and three-phase options
- Stable output across the rated burden
Multi-core CT (metering + protection)
Separate metering and protection cores in one body, for panels where both functions are needed without extra space.
- Metering core 0.2S / 0.5S
- Protection core 5P10, 5P20 or PS
- Saves panel space and cost
- Burden set per core
33kV CT PT Metering Unit
Complete outdoor metering assembly with CTs and PTs in one unit, widely used by utilities for HT consumer and feeder metering.
- Ready-to-install outdoor construction
- CT and PT matched to the metering scheme
- Built to utility and DISCOM specifications
- See our metering units
Typical technical specifications
| Parameter | 33kV Metering CT | 33kV Metering PT |
|---|---|---|
| System voltage | 33kV | 33kV |
| Highest system voltage | 36kV | 36kV |
| Insulation level | 70kV rms / 170kVp | 70kV rms / 170kVp |
| Frequency | 50 Hz (60 Hz on request) | 50 Hz (60 Hz on request) |
| Primary rating | As per requirement | 33kV or 33kV/√3 |
| Secondary rating | 1A or 5A | 110V or 110V/√3 |
| Accuracy class | 0.2S, 0.5S, 0.2, 0.5 | 0.2, 0.5 |
| Rated burden | As per requirement | As per requirement |
| Short-time current | As per system fault level | — |
| Installation | Indoor (resin cast) / Outdoor | Indoor (resin cast) / Outdoor |
Final ratings are defined as per customer, utility and tender specifications and applicable IS/IEC standards. Our technical team confirms every configuration before manufacturing.
Accuracy you can bill on
At 33kV, a small metering error becomes a large amount of money over a year. Even 0.5% on a feeder carrying a few megawatts can mean lakhs of rupees in under- or over-billing.
- Fewer billing disputes between utility and consumer
- Reliable data for energy audits and loss reduction
- Meters protected from fault currents
Built for utility metering
- Extended-range accuracy: 0.2S / 0.5S stays accurate even at low load
- High insulation strength: designed for 36kV class systems
- Utility-ready: built to DISCOM and tender specifications
- Robust construction: stable performance over long service life
- Customizable: ratio, class, burden, cores and mounting
Which accuracy class do you need?
| Class | Product | Typical use |
|---|---|---|
| 0.2S | Metering CT | High-value revenue and interface metering, feeders with wide load variation |
| 0.5S | Metering CT | HT consumer revenue metering and utility feeder metering |
| 0.2 / 0.5 | Metering PT | Revenue and check metering, matched to the CT class |
| 1.0 | Metering CT / PT | Indication and general monitoring |
| 5P / PS | Protection core | Relay protection, supplied as a separate core when required |
“S” class CTs keep their accuracy down to a much lower percentage of rated current, which makes them the better choice where load varies widely.
Where they are used
- 33kV substations
- Utility and DISCOM revenue metering
- HT industrial consumers
- Solar and wind plant export metering
- Metering units and cubicles
- HT switchgear and VCB panels
- Railway and infrastructure projects
- Power generation plants
What to send us
Share as many of these details as you have, or send your datasheet, BOQ or utility specification directly.
Manufacturer, exporter and supplier
We supply 33kV metering CTs and PTs for India and for projects in the following countries and regions:
- India
- United Arab Emirates
- Dubai
- Sharjah
- Saudi Arabia
- Bahrain
- Iraq
- Kuwait
- Oman
- Qatar
- Afghanistan
- South Africa
- Zambia
- Tanzania
- Ghana
- Nepal
- Bhutan
- Bangladesh
- Indonesia
- Kenya
- Malaysia
- Turkey
- Zimbabwe
- and other countries
Frequently asked questions
What accuracy class is used for 33kV revenue metering?
Revenue metering commonly uses 0.2S or 0.5S class CTs with 0.2 or 0.5 class PTs. The exact class is usually set by the utility or tender specification.
What is the difference between 0.5 and 0.5S class CTs?
Both have the same accuracy at rated current, but an “S” class CT stays accurate down to a much lower current. This makes it better for feeders where load varies widely.
Can a metering CT also be used for protection?
Not the same core. A metering core is designed to saturate during faults, while a protection core must stay accurate at high fault currents. A multi-core CT covers both needs.
Do you supply complete 33kV CT PT metering units?
Yes. Along with individual CTs and PTs, we manufacture complete CT PT metering units and metering cubicles up to 33kV.