P5.3 - Electrical Fiber Optical Sensor for High-Voltage Applications

AMA Conferences 2015
2015-05-19 - 2015-05-21
Nürnberg, Germany
Proceedings SENSOR 2015
P5 - Optical Sensors
M. Richter, A. Kölpin, T. Bosselman, R. Weigel - Siemens AG, Erlangen (Germany)
804 - 806


Controlling the energy transfer in high voltage grids implies using sophisticated instrumentation, which has to ensure effective insulation for 150kV to 800kV. Several solutions were previously proposed to facilitate power supply for instrumentation operating at this potential. Most of them exploit the energy dissipated by alternating current grids, which is not possible for the recently emerging direct current grids. There, no alternating electric or alternating magnetic fields are available such that power supply by fiber optical power transmission is a commonly chosen solution. However, most of these systems involve high power laser diodes that lead to a considerable amount of problems and risks. In this paper, an electrical circuit design is proposed that reduces the amount of required energy such that alternative optical power sources can be used. It has been shown that an electrical circuit can measure a temperature and transmit the results, while it is supplied with less than 180μW of power through the fiber used for data transmission. The energy necessary for measurement and transmission of a single temperature value could be reduced to 15μJ. A combination of selected components, energy saving optimized design and programming was used to cut down the energy demands such that light emitting diodes coupled to a standard multi mode fiber are sufficient for power supply.