Optical current transformers help solve the problem of CT unbalanced current and improve the stability of the power system

Optical Current Transformer (OCT) shows unique advantages in solving the unbalanced current problem of current transformer (CT) and helps to significantly improve the stability of the power system. Here’s a closer look at this topic:

1. Overview of CT unbalanced current problems
CT unbalanced current refers to the inconsistent size or phase of the three-phase current in a three-phase circuit due to various reasons (such as unstable power supply voltage, inconsistent cable lengths, damaged cables, poor wiring, etc.), which in turn causes the current output by the CT unbalanced. This unbalanced current may lead to circuit instability, equipment damage, and increased energy consumption, posing a threat to the normal operation of the power system.

2. Advantages of optical current transformer
High-precision measurement:
OCT uses the Faraday magneto-optical effect principle to measure current, which can achieve high-precision current measurement and reduce unbalanced current problems caused by measurement errors.
Excellent insulation performance and anti-electromagnetic interference ability:
OCT has excellent insulation properties and strong anti-electromagnetic interference ability. There is no measurement error caused by electromagnetic interference in traditional CT, thus helping to maintain the accuracy of current measurement.
No magnetic saturation phenomenon:
OCT does not contain an iron core, so there is no magnetic saturation problem. This means that even when the current changes drastically, the OCT can maintain stable measurement performance and avoid unbalanced current problems caused by magnetic saturation.
Wide dynamic range and frequency response:
OCT has a wide dynamic range and frequency response range, which can meet the needs of both measurement and relay protection. This enables it to maintain accurate measurement performance under different working conditions and reduce the occurrence of unbalanced current.

3. Specific ways for optical current transformers to solve CT unbalanced current problems
Improve measurement accuracy:
Reduce unbalanced currents caused by measurement errors through high-precision current measurement. The high-precision measurement capability of OCT makes its output current more accurate and stable.
Enhance system stability:
OCT's excellent insulation properties and anti-electromagnetic interference capabilities help enhance the stability of the power system. Even in complex electromagnetic environments, OCT can maintain stable measurement performance and avoid unbalanced current problems caused by external interference.
Real-time monitoring and adjustment:
After installing OCT in the power system, the changes in current of each phase can be monitored in real time. Once signs of unbalanced current are found, system parameters can be adjusted in time or other measures can be taken to restore current balance.

4. Industry Applications and Prospects
With the rapid development of smart grids and new energy power systems, the requirements for current measurement equipment are becoming higher and higher. OCT has been widely used in power systems with its unique advantages, and has gradually replaced traditional CT as the mainstream current measurement equipment. In the future, with the continuous advancement of technology and further reduction of costs, OCT is expected to be applied in a wider range of fields, providing a strong guarantee for the stable operation of the power system.

Optical current transformers help solve the CT unbalanced current problem and significantly improve the power system through its advantages such as high-precision measurement, excellent insulation performance and anti-electromagnetic interference capability, no magnetic saturation phenomenon, and wide dynamic range and frequency response. stability.