Outdoor 33kV Current Transformer Manufacturer in India
AMREST Electricals Limited is an Outdoor 33kV Current Transformer manufacturer, supplier and exporter in India. We make CTs for accurate current measurement, energy metering and protection.
As a result, our CTs serve substations, switchyards, distribution networks, industries and renewable energy projects. In addition, we build every unit to your specification.
What is an outdoor 33kV current transformer?
An outdoor 33kV current transformer is an instrument transformer. First, it takes the high current in the line. Then, it turns that current into a small, proportional secondary current, usually 1A or 5A.
Because of this, meters and relays can measure the current safely. At the same time, the CT keeps them isolated from the high-voltage line.
An outdoor CT sits in the open air, for example on a switchyard structure. Therefore, it needs strong insulation, a weatherproof body and good mechanical strength. That way, it can handle rain, dust, pollution, sun and heat for many years.
Metering
First, a metering CT measures current accurately at normal load. As a result, energy meters bill correctly.
Protection
Second, a protection CT sends a clear signal to relays during a fault. So, the breaker trips on time.
Monitoring
Finally, CTs also feed ammeters, power analysers and SCADA systems. Thus, you can track load all day.
Single bushing and double bushing designs
We make two main designs. However, both share the same 33kV insulation class and core options.
Outdoor 33kV Single Bushing CT
This single phase unit has one primary bushing. Therefore, it suits compact layouts with a simple primary connection.
- For example, feeder and transformer bays
- Also, outdoor 33kV structures and switchyards
- In addition, metering, protection or multi-core options
Outdoor 33kV Double Bushing CT
On the other hand, this design brings both primary terminals out through separate bushings. So, it fits layouts that need this connection.
- For example, a defined primary terminal layout
- Also, substations, switchyards and industrial networks
- In addition, metering, protection or multi-core options
Built for outdoor 33kV duty
Accurate measurement
Our CTs measure current accurately across the rated range. As a result, metering and monitoring stay reliable.
Outdoor-ready build
We design each CT for open substations. Also, we match the creepage distance to your site pollution level.
Reliable insulation
We select insulation for the 36kV equipment class. Therefore, the CT handles normal voltage and surges safely.
Metering & protection cores
You can choose one core or several. Moreover, each core gets its own class and burden.
Custom CT ratios
We set the primary and secondary ratings to your needs. For instance, we offer single or multi-ratio designs.
Project-specific build
Finally, we match accuracy class, burden, mounting and terminals to your drawing.
Technical specifications
| Parameter | Specification |
|---|---|
| Product name | Outdoor 33kV Current Transformer |
| Manufacturer | AMREST Electricals Limited |
| Rated system voltage | 33kV |
| Highest voltage for equipment | 36kV |
| Type | Outdoor Current Transformer |
| Phase | Single phase |
| Frequency | 50 Hz / as required |
| Secondary current | 1A / 5A |
| Accuracy class | 0.2S, 0.5S, 5P10, 5P20, PS |
| CT ratio | As per customer need |
| Number of cores | Single / Multiple |
| Rated burden | As per project |
| Bushing design | Single / Double bushing |
| Application | Metering and protection |
| Country of origin | India |
However, the final design depends on your approved datasheet and the applicable standards. Not sure about creepage or insulation? In that case, read our outdoor 33kV CT buyer’s guide.
Metering vs protection CTs
- A metering CT measures accurately at normal load. So, it suits billing and energy audits.
- In contrast, a protection CT stays accurate at fault current. Therefore, relays trip correctly.
- A multi-core CT combines both. As a result, you save space on the structure.
Our key strengths
- First, we make 33kV CTs in India ourselves.
- Also, we offer both single and double bushing designs.
- In addition, we customise ratio, burden and accuracy class.
- Moreover, we review your specification before we start.
- Finally, we supply projects in India and abroad.
Where they are used
33kV substations
For example, they measure and protect feeders and transformer bays.
Distribution networks
Also, they monitor current and drive protective relays.
Outdoor switchyards
In addition, they work with HV switching and protection gear.
Industrial power systems
Similarly, factories use them for monitoring and protection.
Solar and wind plants
Likewise, renewable substations use them for metering and protection.
Utility and EPC projects
Finally, utilities and EPC firms use them in new infrastructure.
What to send us
Please share as many of these details as you can. Alternatively, just send your datasheet or BOQ.
Supplier and exporter
We supply outdoor 33kV CTs for new sites, expansions and replacements. Besides India, we also serve projects in these countries:
- 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 does a 33kV current transformer do?
It turns high line current into a small, proportional current. As a result, meters and relays can measure it safely.
Where do people use outdoor 33kV CTs?
Mostly, they go into substations, outdoor switchyards and distribution networks. In addition, industries and solar plants use them.
How do metering and protection CTs differ?
A metering CT stays accurate at normal load. In contrast, a protection CT stays accurate during faults, so relays work correctly.
Does AMREST make custom 33kV CTs?
Yes, of course. We build each CT to your ratio, class, burden, cores and layout.
Which secondary currents can I choose?
Usually, you can choose 1A or 5A. However, the best choice depends on your meters and cable length.