• Comcore Universal PM Fiber Fusion Splicer

    ● Proprietary end-face imaging technology

    ● Applicable for complex PM fiber stress structures

    ● Capability of fusing various PM fiber combinations

    ● High precision fiber positioning and angular alignment

    ● Easy operation

    ● Minimum maintenance cost

  • Fused PM Fiber Splitter (Mixer)

    ● Low Excess Loss

    ● High Extinction Ratio

    ● High Power Handling

    ● Available for Slow or Fast Axis Operation

    ● Higher performance than Telcordia GR-1221

  • PM Fiber Optical Polarizer

    ● Stable Extinction Ratio

    ● Low Insertion Loss

    ● Low Back Reflection

    ● Bi-Directional Operation

    ● All-Fiber Construction

  • PM Fiber WDM

    ● Low Excess Loss

    ● High Extinction Ratio

    ● High Power Handling

    ● Available for Slow or Fast Axis Operation

    ● Higher performance than Telcordia GR-1221

  • Plastic Fiber Splitter (Mixer)

    ● Low Insertion Loss

    ● Good Uniformity

    ● High Reliability

    ● Compact Size

  • Fiber Optical Current Sensors

    ● All-fiber structure

    ● Easy to install and transport

    ● Insensitive to shock and vibration

    ● Excellent temperature consistency and long term reliability

    ● Integrated broadband wave plate

  • Fiber Optical Current Sensing Fixed Coils

    ● All-fiber structure

    ● Easy to install and transport

    ● Insensitive to shock and vibration

    ● Excellent temperature consistency and long term reliability

    ● Integrated broadband wave plate

  • Combiners

    ● High Power Coupling Efficiency

    ● Wavelength Insensitive

    ● High Power Handling

    ● Customer Configurations Available

TECHNOLOGIES

Current position:Home / Technologies

Comcore's FOCT Introduction

1. FOCT Overview

The pure Fiber Optical Current Transformer (FOCT) is based on the Faraday Effects for measuring electric current in conductor with non-contact method. Its highlight advantage is only a special optical sensing fiber installed at the HV primary point without any other functional components. This tech ensures no high voltage breakdown phenomenon, and greatly improves the reliability of transformers, and far beyond the conventional CT. Therefore, FOCT replacing conventional CT in applications is ultimate trend; meanwhile FOCT will be the representing technology in HV and UHV Smart Grid. As the D&T system operations based on CT feedback information, FOCT is the high-end core equipment in D&T system. As a magnetic field sensor, FOCT is also used in nuclear power, aviation, metallurgy, military and other fields with a wide application prospect. Comcore FOCT utilize the sensing fiber with their independent developed, and self owned intellectual property rights - special high birefringence optical spun fiber, which has solved the global technical problems - FOCT long-term stability problems; Temperature compensation problems; Small signal noise problems; Anti vibration problems; Sensing ring installation problems (without to disconnect a bus bar or open GIS tank); As well as accuracy problems at 1A rated current in unbalanced current detection between capacitor banks. At the same time, abandoned the traditional hands on process of 1/4 wave plate, greatly improved the scale of producing capacity and consistency of the FOCT performance. In order to better satisfy applications in electric power industry and other areas, Comcore has developed three categories of FOCTs for different environments and accuracy requests.​

Comcore FOCTs

Modulator Unite (MU) is separated from Electric Chassis and connected with single model (SM) fiber in between. Because the SM fiber length can reach as long as 1km, Electric Chassis can be indoor settled in control room as the secondary part, and the sensor head and MU together as the primary part can be installed at the remote measurement point. As the primary part can be processed into foot support style, flexible style, and DIY designed with light, Comcore FOCT TYPE One can be easily installed in harsh electrical environments without disconnected bus bar or GIS equipments.​

The prominent feature is the system with Self Correction function to improve the measurement accuracy and MU is integrated inside of the Electrical Chassis. Combined with flexible sensor head, Comcore FOCT can satisfied the high accuracy request applications on aerospace, high tech research, etc.

3. Typical performance of Comcore's FOCT

4. Comcore's FOCT Partially Describes

  • Comcore's 220kV FOCT for GIS Application

  • Comcore's High-Accuracy FOCT for GIS Application

  • Comcore's FOCT for 220kV AIS Application

  • Comcore's FOCT for 150kV DC Application

  • Comcore's FOCT with flexible sensing cable being tested in SGCC(Wuhan)

  • Calibration test for Comcore's FOCT with high-accuracy and high DC in China Institute of Metrology.

Top