Outdoor 33kV Potential Transformer Manufacturer in India
AMREST Electricals Limited is an Outdoor 33kV Potential Transformer manufacturer, supplier and exporter in India. We make PTs for accurate voltage measurement, energy metering and protection.
As a result, our PTs serve substations, switchyards, distribution networks, industries and renewable energy projects. In addition, we build every unit to your specification.
What is an outdoor 33kV potential transformer?
An outdoor 33kV potential transformer is an instrument transformer. It is also called a voltage transformer (VT). First, it takes the high voltage of the line. Then, it turns that voltage into a low, proportional secondary voltage, usually 110V or 110V/√3.
Because of this, meters and relays can read the voltage safely. At the same time, the PT keeps them isolated from the high-voltage circuit.
An outdoor PT sits in the open air, for example in a switchyard or feeder bay. Therefore, it needs strong insulation and a weatherproof body. That way, it can handle rain, dust, pollution, sun and heat for many years.
Metering
First, a metering PT gives an accurate voltage signal at normal conditions. As a result, energy meters bill correctly.
Protection
Second, a protection PT feeds voltage to relays. So, the relays can detect faults and abnormal voltage.
Monitoring
Finally, PTs also feed voltmeters, power analysers and SCADA. Thus, you can watch the system all day.
Oil-immersed and resin cast designs
We make two main types. However, both share the same 33kV insulation class and accuracy options.
Outdoor Oil-Immersed PT
This PT uses insulating oil for insulation and cooling. Therefore, it suits utility substations and industrial networks.
- For example, a proven insulation technology
- Also, ideal for outdoor substation yards
- In addition, project-specific ratings
Outdoor Resin Cast PT
On the other hand, this PT uses outdoor-grade resin instead of oil. So, it needs less maintenance and has no leak risk.
- For example, an oil-free construction
- Also, a compact design
- In addition, metering and protection options
Built for outdoor 33kV duty
Accurate measurement
Our PTs measure voltage accurately in 33kV networks. As a result, metering stays reliable.
Weather-resistant build
We design each PT for open substations. Also, we match the creepage distance to your site.
Reliable insulation
We select insulation for the 36kV class. Therefore, the PT handles normal voltage and surges safely.
Custom voltage ratios
We set primary and secondary ratings to your needs. For instance, we offer 33kV/√3 : 110V/√3.
Single or three phase
You can choose the phase arrangement. Moreover, each design follows an approved drawing.
Multiple accuracy classes
Finally, you can pick metering and protection classes, even in one PT.
Technical specifications
| Parameter | Typical specification |
|---|---|
| Product name | Outdoor 33kV Potential Transformer |
| Manufacturer | AMREST Electricals Limited |
| Rated system voltage | 33kV |
| Highest system voltage | 36kV |
| Type | Outdoor Potential Transformer |
| Phase | Single phase / Three phase |
| Frequency | 50 Hz / 60 Hz |
| Primary voltage | 33kV/√3 or as required |
| Secondary voltage | 110V / 110V/√3 |
| Metering accuracy class | 0.2 / 0.5 / 1.0 |
| Protection accuracy class | 3P / 6P |
| Rated burden | As per project |
| Insulation medium | Oil-immersed / Outdoor resin cast |
| Application | Metering / Protection |
| Installation | Outdoor substation / Switchyard |
| Country of origin | India |
However, these are typical values, not a datasheet for every model. Therefore, final ratings follow your approved drawing and project needs. For help, read our outdoor 33kV PT buyer’s guide.
How a PT differs from a CT
- A current transformer (CT) steps down current. So, it measures how much power flows.
- In contrast, a potential transformer (PT) steps down voltage. Therefore, it measures the line voltage.
- An energy meter needs both. As a result, most metering points use CTs and PTs together.
Our key strengths
- First, we make outdoor 33kV PTs in India ourselves.
- Also, we offer both oil-immersed and resin cast designs.
- In addition, we customise ratio, class and burden.
- 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 support voltage metering and relay protection.
Distribution networks
Also, they send voltage signals for monitoring and protection.
Outdoor switchyards
In addition, they measure and monitor voltage in HV yards.
Industrial installations
Similarly, factories use them in their power systems.
Solar and wind plants
Likewise, renewable substations use them at grid connection points.
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 PTs to utilities, contractors, consultants and EPC firms. 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 an outdoor 33kV potential transformer do?
It turns high voltage into a low, proportional voltage. As a result, meters and relays can read it safely.
Where do people use outdoor 33kV PTs?
Mostly, they go into substations, switchyards and distribution networks. In addition, industries and solar plants use them.
What is the secondary voltage of a 33kV PT?
Usually, it is 110V or 110V/√3. However, the right value depends on how you connect the PT.
How does a CT differ from a PT?
A CT steps down current. In contrast, a PT steps down voltage. Therefore, meters often need both.
Does AMREST make custom 33kV PTs?
Yes, of course. We build each PT to your ratio, class, burden, insulation and layout.
Why choose an outdoor 33kV PT?
Because it gives accurate voltage, safe isolation and strong protection support. Also, it works well in open-air sites.