Different Current Transformer Types
In this blog we will go over the different types of Current Transformers available in the market. in a seperate blog which we will link to we will discuss the Burden or Losses which you need tobe aware of when installing Current Transformers (CT's)
Why so many CT Types?
People often wonder and get confised why there are so many different types, sizes and ratings for Current Transformers. The answer is simply that there are almost endless applications for current transformers. From Power Metering, Energy Monitoring, Power Quality Aanalysis, to Power Control and Safefty Systems, each application can have different accuracy, sizing, and other physical requirements.
Overview of CT Types in the market.
In this table we have listed the main applications we are involved with. This is by no means every applications and is intended to give you an idea of the different styles of CT's.
0.333V CT's and Rogowski Coils were intedned for US based Equipment, and in the past all Rogowski Coils were only availale in 0.333V. Nowadays 1 Amp, or 5 Amp Rogowski Coils are available, however in many cases the unit costs are prohibitive. For new installations we highly reccommend to use Large Split Cores CT's.
You can clik on the image of each range to open up the available range in our store. There you will find detailed specifications along with matching datasheets.
The majority of our CT's are ROHS, UL, and CE Approved. If in doubt feel free to ask our sales team.
Current Transformer Type
|
Advantages
|
Image
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Available Range
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Resin Cast Split Core |
Accuracy to Class 0.5, High VA Rating |
|
100Amp - 5000Amp |
Resin Cast Solid Core |
Accuracy to Class 0.2, High VA Rating, Low Cost |
|
1Amp - 7500Amp |
Encapsulated Split Core 1/5 Amp |
Accuracy to Class 0.5, Rugged, Low Cost |
|
100Amp - 5000Amp |
Encapsulated Solid Core 1/5 Amp |
Accuracy to Class 0.5, Rugged, Low Cost, Compact
|
|
40Amp - 500 Amp |
Encapsulated Small Split Core 5Amp |
Accuracy to Class 1 over Short Distances, Low Cost, Compact
|
|
50Amp - 300Amp |
Encapsulated Small Split Core 0.333V |
Accuracy to Class 1 over Short Distances, Low Cost, Compact
|
|
50Amp - 300Amp |
Encapsulated Split Core Low Cost 0.333V |
Accuracy to Class 1 over Short Distances, Low Cost, Compact
|
|
5Amp - 2000Amp |
Clip Split Core 5 Amp |
Accuracy to Class 1, Low Cost, Easy to install
|
|
100Amp - 800 Amp |
Rogowski Coil & Integrator- Resitance Based 5 Amp |
Accuracy to Class 1, Easy to install, Integrator Matched to Coil
|
|
500Amp - 5000Amp (User Selectable) |
Rogowski Coil & Integrator - Resitance Based 0.333V |
Accuracy to Class 1, Easy to install, Integrator Matched to Coil
|
|
500Amp - 3000Amp (Higher ratings on request) |
Rogowski Coil - Resitance Based |
Accuracy to Class 1, Easy to install, requires matched integrator/meter
|
|
50 - 30,000 Amp |
LEM Rogowski Coil & Integrator - Ferrite Core, 0.333v, 0.166v, 4-20mA, 0-20mA, 0-5V, 0-10V |
Highest Accuracy to Class 0.5, Easy to install, Integrator suits and LEM Coil, Low interference
|
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100 - 5000 Amp (User Selectable)
|
LEM Rogowski Coil & Integrator - Ferrite Core 1 Amp |
Highest Accuracy to Class 0.5, Easy to install, Integrator suits and LEM Coil, Low interference
|
|
100 - 5000 Amp (User Selectable) |
LEM Rogowski Coil - Ferrite Core |
Highest Accuracy Coils on the market, Class 0.5, Easy to install, Suits any LEM integrator
|
|
20Amp - Unlimited |
Resin Cast Protection Class CT |
Fast Response, 60 x In Overload for 1 sec |
|
100Amp - 5000Amp |
In addition, there is a wide range of CT's and Hall Effect Sensors with Process Output. We will cover those types in a seperate blog as they apply to the process and power automation markets.
Fro applications advice see our blog on CT Cable Losses to ensure you final system accuracy is as intended