Current Transformers

A current transformer (CT) is a transformer used to measure current in a circuit. It produces a current in its secondary winding that is proportional to the current flowing in its primary winding. Current transformers are used in diagnostics, and metering in the electrical power industry. 

They are also used in industrial processes where current measurement is required. For example, they can be used to measure pulsed current in a linear accelerator or alternating current in power lines. Most current transformer manufacturers have a primary winding that consists of one or more turns of conductor and a secondary winding that consists of many turns of fine wire. 

The primary winding is connected in series with the circuit that is being measured. The secondary winding is connected to a meter or other measuring device. The magnitude of the induced current is proportional to the magnitude of the current in the primary winding. The current transformer transforms the high primary current into a lower secondary current that can be safely measured. 

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Current Transformer Capabilities

General Information

Accurate and stable measurements over a wide range of currents 

Stangenes Industries, a current transformer manufacturer and electromagnetics specialist, produce highly accurate and stable devices that measure currents over wide frequency and current ranges. These devices have several features that make them an ideal choice for use in various applications.  

First, Stangenes Industries current transformers can measure currents over a wide range of magnitudes. This ensures that the devices can be used in different settings, from low-power ones to high-power ones. Second, they are extremely stable, maintaining accuracy even when exposed to extreme conditions. Finally, they are designed to be simple and easy to use, making them an ideal choice for many users. As a result, Stangenes Industries is an excellent choice for any application that requires accurate and stable current measurements. 

Isolation of the secondary circuit from the primary conductor allows the safe measurement of high voltages 

Current transformers are a type of transformer used to measure electrical current. They work by isolating the secondary circuit from the primary conductor, which allows for the safe measurement of high voltages.  

Current transformers are especially well-suited for this purpose because they have a unique construction that provides superior isolation between the primary and secondary circuits. This makes them ideal for measuring high voltages while keeping safety levels high. Stangenes Industries current transformers are designed to withstand currents up to 500 kA. 

Low impedance path for the monitoring device is to prevent the loading of the primary conductor 

These current transformers are used in many applications, including monitoring devices such as power meters, transducers, and relays. They are placed in the transformer’s secondary circuit, and their purpose is to provide an accurate representation of the current flowing through the primary conductor without loading it.  

Current transformers are designed to meet the most demanding specifications and are available in various sizes and configurations to meet the needs of any application. Stangenes Industries offers a range of standard products as well as custom designs to meet any customer needs. 

High inrush current capability 

Current transformers are designed to have a high inrush current capability. This means that they can handle large spikes in current without being damaged. Current transformers are used in various applications, including power grid monitoring and meter reading. They are also used in motor control and protection. Current transformers are available in different sizes and shapes and can be either dry-type or oil-filled and have a range of dimensions to handle varying primary conductor sizes. 

Configurable tap settings for different voltage and current ratios 

Current transformers produce a scaled-down version of the current in the circuit being measured. Depending on the measuring device or end circuit, the measurement ratio may need to be adjusted. Stangenes Industries current transformers can be configured with tap settings that allow for different voltage and current ratios.  

Compact size for easy installation 

Current transformers have many features that make them ideal for many applications.  

  • They have a compact size that makes them easy to install.  
  • They are rugged and durable, able to withstand harsh conditions.  
  • They are accurate and reliable, able to provide precise measurements 
  • They are low maintenance, requiring little upkeep. Finally, they are cost-effective, providing a reasonable return on investment.  

These features make current transformers an attractive option for many businesses and homeowners. 

Custom designs to meet specific application requirements 

Current transformers can be custom designed to meet the specific requirements of an application. Standard features include taps for voltage regulation, hermetically sealed construction, and powder-coated enclosures. 

We make current transformers that are more than just a commodity. 

With the capabilities of our current transformers, we can help you improve your business in many ways. We have a wide range of products and services that can help you reduce costs, save energy, and improve efficiency.  

Ready to get started? Contact our team today! 

Industry Standards

ISO-9001-2015
International Organization for Standardization

Wide Band Current Transformers

Accuracy: ±0.5% initial pulse response for all models. Specifications for transformer ratio, accuracy, and droop are at open circuit. Rise time and bandwidth are when terminated with 50Ω. All models are electrostatically shielded and have a 50Ω output impedance.

Model No. Output (volt/amp) Accuracy ±0.5% Inner Diameter (inches) Max. Current (amperes) Peak Max. Current (amperes) Rms Square Pulse Rise Time (nanosec) Square Pulse Droop (%/µsec) Square Pulse IT max. (amp.sec)
0.5-1.0W 1.0 0.5 500 5 10 0.1 0.002
0.5-0.1W 0.1 0.5 5 k 50 20 0.001 0.2
0.5-0.1WA 0.1 0.5 5 k 50 20 0.05 0.25
2-1.0W 1.0 2.0 500 7.5 20 0.08 0.005
2-0.5W 0.5 2.0 1 k 15 20 0.02 0.02
2-0.1W 0.1 2.0 5 k 65 20 0.0008 0.5
2-0.1WA 0.1 2.0 10 k 65 20 0.0006 0.5
Model No. Approx. 3dB Point Low (Hz) Approx. 3dB Point High (MHz)) I/F (Peak Amp/Hz) Notes Receptacle
0.5-1.0W 140 35 0.006 1 BNC Jack
0.5-0.1W 1 20 0.6 1 BNC Jack
0.5-0.1WA 100 20 1.6 BNC Jack
2-1.0W 125 20 0.017 1 BNC Jack
2-0.5W 40 20 0.07 1 BNC Jack
2-0.1W 1 20 1.5 1 BNC Jack
2-0.1WA 1 20 1.5 1 C Jack

Notes:

  • May need small bias current through secondary for maximum rating.
  • Double shielded

Other standard and custom models available.

Pulse Current Transformers
Model No. Output (volt/amp) Accuracy ±0.5% Inner Diameter (inches) Max. Current (amperes) Peak Max. Current (amperes) Rms Square Pulse Rise Time (nanosec) Square Pulse Droop (%/µsec) Square Pulse IT max. (amp.sec) Notes
0.5-1.0 1 0.5 500 7 10 0.05 0.002 1
0.5-0.1 0.1 0.5 5 k 30 10 0.05 0.02 1
0.5-0.01 0.01 0.5 50 k 300 20 0.0005 0.2 1
1-1.0 1 1 500 7 20 0.1 0.006 1
1-0.1 0.1 1 5 k 30 20 0.01 0.06 1
2-1.0 1 2 500 7 20 0.05 0.006 1
2-0.1 0.1 2 5 k 30 20 0.005 0.06 1
3-1.0 1 2.87 500 7 20 0.2 0.002 1
3-0.1 0.1 2.87 5 k 30 20 0.35 0.1
3-0.1A 0.1 2.87 5 k 30 20 0.015 0.03
3-0.01 0.01 2.87 50 k 100 20 0.02 1
3-0.002 0.002 2.87 200 k 1100 100 0.005 5
3.5-1.0 1 3.5 500 7 50 0.01 0.03 1
3.5-0.1 0.1 3.5 5 k 70 50 0.013 0.65 2
3.5-0.01 0.01 3.5 50 k 400 200 0.002 22 2

Other standard and custom models available.
Notes:

  • May need small bias current through secondary for maximum rating.
  • Double shielded

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