Why External CTs?
High Current Measurements:
Safety: High currents can be dangerous. External CTs allow measurements to be taken without directly connecting the meter to the high-current circuit, reducing the risk of electrical shock and equipment damage.
Accuracy: CTs can provide more accurate measurements, especially for non-sinusoidal waveforms or harmonics, which can be challenging for built-in current sensors.
Flexibility:
Retrofitting: External CTs can be added to existing installations without replacing the entire meter, making them ideal for upgrades or modifications.
Different Current Ranges: By choosing CTs with different ratios, the meter can accommodate a wide range of current values.
Isolation:
Electrical Isolation: CTs provide galvanic isolation between the primary and secondary circuits, enhancing safety and reducing the risk of ground faults.
Noise Reduction: Isolation can help to reduce noise and interference in the measurement circuit.
Remote Sensing:
CTs can be installed at a distance from the meter, allowing for more accurate measurements in environments with significant voltage drops or noise.
Advantages of External CT Connected DIN Rail Meters
Versatility: Suitable for a wide range of applications, from small-scale industrial installations to large-scale power distribution systems.
Accuracy: Higher accuracy, especially for non-standard load conditions.
Safety: Enhanced safety due to isolation and reduced risk of electrical shock.
Flexibility: Can be easily adapted to different measurement requirements.
Cost-Effective: In many cases, it can be more cost-effective to use external CTs than to replace the entire meter.
When to Choose External CT Connected DIN Rail Meters
High current applications: Where the expected current exceeds the rating of the built-in current sensors.
Applications requiring high accuracy: For critical measurements or when harmonics are present.
Retrofitting existing installations: When adding metering to an existing system.
Applications requiring remote sensing: Where the measurement point is distant from the meter.
Conclusion
While ordinary DIN rail three-phase meters are suitable for many applications, external CT connected DIN rail meters offer significant advantages in terms of flexibility, accuracy, and safety. The choice between the two depends on the specific requirements of the application. By understanding the benefits of external CTs, engineers and technicians can make informed decisions about the most appropriate metering solution for their projects.
If you are interested in a CT connected energy meter, please feel free to contact us.
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