Bus Bar Monitoring for Overheating

"Improved Detection of Bus Bar Overheating"


Customer Concerns

Bus bars for high current power distribution

Bus bars are uninsulated strips of a highly conductive metal such as copper or aluminum. As they have lower electrical resistance than insulated power cables, they can carry large electrical currents and are thus suitable for use in power distributions systems in power plants, substations, factories, and data centers. Bus bars are also used in power distribution boards. Bus bars offer great flexibility as they are made of highly malleable metals that can be easily shaped to suit any number of facility layouts.

Abnormal overheating of bus bars

Bus bars are bolted, clamped, or welded to each other and to other apparatuses. If a bolt or clamp comes lose or a welded joint fails, abnormal heating may occur at that location due to an increase in the electrical resistance. The overheating further increases the electrical resistance and can lead to a burnout or even a fire.

In order to prevent overheating at any of the bus connections, the connections should be inspected on a regular basis. However, as the bus bars are often inside plastic or metal bus ducts and covers, and are often in difficult to access locations, visual inspection can be difficult.

The burning out of a power supply bus bar is a threat to plant safety and can lead to an unplanned shutdown of plant operations. To eliminate such risks and avoid the huge costs of lost production, it is vital to quickly detect and immediately respond to any indication of overheating in a power bus bar.

Abnormal overheating of bus duct

The Solutions and the Benefits

24/7/365 temperature monitoring to detect overheating

Burnouts in a power bus bar can be prevented by quickly and accurately detecting abnormal rises in temperature and locating the hot spots. As bus bars are surrounded by strong electric fields, conventional electric sensors such as thermocouple thermometers are not suitable for this purpose. Bus bars also sometimes follow complicated paths through plant structures and other types of buildings and may have a number of blind spots that cannot be readily imaged using thermal imaging cameras.

The Yokogawa DTSX is a unique and innovative temperature monitoring solution that uses an optical fiber cable as a temperature sensor. Since the sensor is not affected by electromagnetic noise, the DTSX is able to monitor distribution of temperature in units of 1 meter accuracy under a strong electric field. By quickly detecting overheating and pinpointing the location of a hotspot, the DTSX ensures that any problem can be responded to immediately, before it leads to a costly and expensive plant shutdown.
The optical fiber cable can be installed directly on a bus bar and on the surface of a bus duct or cover.

Efficient inspection inside bus ducts

Thanks to its ability to continuously detect abnormal rises in temperature and pinpoint hot spots even when a bus bar is located inside a bus duct, the DTSX is also useful in maintenance applications such as locating bolts that need to be tightened.

The benefits

  • Accurate temperature monitoring under a strong electric field
  • Flexible sensor cable for complex extended structure
  • Quick detection with abnormal location to prevent burnout
  • Condition based inspection work by temperature changes
Cable laying example for bus duct

How DTSX Works

Measuring the intensity of Raman scattered light
Using pulses of laser light beamed through an optical fiber cable, the DTSX is able to detect temperature-dependent variations in signal frequency that are the result of a phenomenon known as Raman scattering that occurs along the entire length of the optical fiber cable, and it also can determine the locations of those temperature readings using light that is bounced back (backscattering) to the source.

Example: Along a 6,000 meter optical fiber cable, nearly 6,000 measurement points
By measuring how long it takes light to make a round trip back to the source (backscattering), the DTSX is able to calculate the location for each temperature reading. Abnormalities can be located with a spatial resolution of just one meter.

Temperature monitoring using optical fiber cable​​​​​​

Raman backscattering


  • 배터리(2차 전지)

    전지 (리튬 이온 전지, 리튬 이온 커패시터, 연료 전지 등) 산업은 글로벌 전개, 혁신 등의 시장 변화 속에서 많은 고객들은 아래의 과제를 가지고 있습니다.

    • 높은 품질 요구에 대한 대응 및 추적 강화 요구에 대응
    • 경쟁력 강화를 위한 생산의 효율화 · 비용 절감
    • 환경 · 에너지 문제에 대한 대응
    • 기술 · 지식의 공유화에 대한 대응

    Yokogawa는 향후 기대되는 리튬 이온 전지와 연료 전지 등의 재료 개발부터 제조 공정에 이르기까지 각 업계 · 분야에서 다년간 축적된 최신 · 최고 기술과 계측 · 제어 · 정보의 노하우와 실적을 유기적으로 결합시킨 솔루션을 제공합니다.

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Related Products & Solutions

  • DTSX1 Fiber Optic Heat Detector

    DTSX1 stores the functions required for heat detection in one box. DTSX1 analyzes the temperature data with high accuracy by measuring with fiber optic sensor cable and perform high temperature heat detection.

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  • DTSX3000 [장거리]

    DTSX3000은 오일 / 가스 어플리케이션, LNG 및 정제 시설, 파이프 라인 및 탱크 누출 감지 및 기타 열 모니터링 어플리케이션을 위해 설계되었습니다.

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