What are the disadvantages of the low rated secondary current transformer?

Low rated secondary current transformers (CTs) come with a set of disadvantages that might affect their performance and applicability in certain situations. While they have their uses, especially in high-precision applications or where safety considerations dictate limiting the secondary current, there are several drawbacks to consider:

1. Accuracy Issues at Low Current Levels: Low rated CTs can experience accuracy issues, especially when operating at current levels significantly below their rated capacity. At very low currents, the accuracy might degrade due to the transformer’s inability to precisely measure such low flows, impacting the reliability of the data or signal.

2. Saturation Issues: When a CT operates close to its rated current, there’s a risk of the core saturating. However, in low rated CTs, the likelihood and impact of saturation can be more pronounced due to their design to operate at low currents, leading to non-linear errors in measurements.

3. Compatibility and Scalability: Systems designed with low rated CTs might face challenges when scaling up or requiring interfacing with equipment or systems characterized by higher current levels. It entails additional steps or equipment for compatibility, affecting system flexibility and potentially increasing costs.

4. Increased Burden Requirements: To accurately capture low currents, low rated CTs may require more sensitive and hence more burdensome measurement equipment. This increased burden (the impedance of the secondary circuit) can influence the accuracy and performance of the CT, necessitating finely tuned or more sophisticated monitoring equipment.

5. **Physical Size and