How to Choose between Split-Core CT and RosCoil for Power and Energy Monitoring?

Power and energy monitoring is an essential aspect of any electrical system. It helps to ensure that the system is operating efficiently and effectively. One of the critical components of power and energy monitoring is the current transformer (CT). The CT is responsible for measuring the current flowing through the system and providing data for analysis. There are two types of CTs - split-core CT and Rogowski coil (RosCoil). In this article, we will discuss how to choose between split-core CT and RosCoil for power and energy monitoring.

Split-Core CT

A split-core CT is a type of CT that can be easily installed without the need to disconnect any cables. The CT is split open, and the two halves are placed around the cable that needs to be monitored. The CT is then closed, and it is ready to use. Split-core CTs are available in different sizes and are suitable for a wide range of applications.

One of the advantages of split-core CTs is their ease of installation. They can be installed quickly, and there is no need to disconnect any cables. This makes them ideal for retrofit applications where the system needs to be monitored without disrupting the existing installation. Split-core CTs are also relatively inexpensive compared to other types of CTs.

However, split-core CTs have some limitations. They are not suitable for high-current applications, and their accuracy can be affected by external magnetic fields. They also require a secondary burden resistor, which can add to the cost and complexity of the installation.

RosCoil

A Rogowski coil (RosCoil) is a type of CT that does not have a magnetic core. Instead, it consists of a coil of wire that is wrapped around the cable that needs to be monitored. The RosCoil is connected to a signal conditioner, which provides the output signal. RosCoils are available in different sizes and are suitable for a wide range of applications.

One of the advantages of RosCoils is their accuracy. They are highly accurate, even at low currents, and their accuracy is not affected by external magnetic fields. They are also suitable for high-current applications and do not require a secondary burden resistor.

However, RosCoils have some limitations. They are more expensive than split-core CTs, and they can be more challenging to install. They require the cable to be disconnected, and the coil needs to be wrapped around the cable, which can be time-consuming.

Choosing between Split-Core CT and RosCoil

When choosing between split-core CT and RosCoil, several factors need to be considered. These include the application, the accuracy required, the current range, and the installation requirements.

For low-current applications, split-core CTs are suitable. They are easy to install, relatively inexpensive, and provide accurate measurements. However, for high-current applications, RosCoils are a better option. They are highly accurate, even at low currents, and do not require a secondary burden resistor.

When it comes to installation, split-core CTs are the better option for retrofit applications. They can be installed quickly, and there is no need to disconnect any cables. However, for new installations, RosCoils are a better option. They provide more accurate measurements, and their accuracy is not affected by external magnetic fields.

Conclusion

In conclusion, choosing between split-core CT and RosCoil depends on several factors. For low-current applications, split-core CTs are suitable, while for high-current applications, RosCoils are a better option. When it comes to installation, split-core CTs are the better option for retrofit applications, while RosCoils are a better option for new installations. It is essential to consider these factors when selecting a CT for power and energy monitoring.