Why current transformer shall be grounded

FAQ | Mar 18,2023

Current transformers (CTs) are often used in power systems to measure or monitor electrical current. Grounding the CTs is an important safety measure, as it helps protect against electrical shock and ensures that the system operates safely and efficiently.

There are several reasons why a current transformer should be grounded:

  1. Safety: Grounding the CT provides an additional path for fault currents to flow to ground, which helps protect against electrical shock hazards. If a fault occurs in the system, the grounded CT can help to limit the potential damage and protect personnel from injury.
  2. Stability: Grounding the CT can help to improve the stability of the electrical system. By providing a low-impedance path to ground, the grounded CT can help to reduce the risk of overvoltage and other issues that can cause instability in the system.
  3. Accuracy: Grounding the CT can help to ensure accurate measurements of electrical current. If the CT is not properly grounded, it can be affected by stray electrical fields and other interference, which can lead to inaccurate readings.
  4. Compliance: Grounding the CT is often required by electrical codes and standards. Compliance with these requirements helps to ensure that the system is safe and meets the necessary regulatory requirements.

In summary, grounding the current transformer is an important safety measure that helps protect against electrical shock hazards, improves system stability, ensures accurate measurements of electrical current, and helps meet regulatory requirements.

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