Jin Shixin

The Analysis on Temperature Characteristic of Fiber Optic Current Sensor Ratio Error

This paper researched on the error ratio of fiber optical current sensor (FOCS) induced by temperature drift. The principle about the influence of temperature fluctuation on FOCS was explained. Based on the principle, the math module of the influence of temperature on linear birefringence and the influence of linear birefringence on FOCS were established to deduce the math module of the influence of temperature on FOCS. By the math module, the reason of FOCS error drift was described to explain the relationship among temperature, linear-birefringence and FOCS ratio error. In the range of testing temperature, both the ratio error of FOCS and linear birefringence had a linear relationship with temperature. The experiment results conformed theoretical analysis. The FOCT ratio error had a linear relationship with experiment temperature 10-60°C.

The Design of Electronic Current Collector Based on Fault Travelling Wave Location

This paper presents a new-type design of electronic current collector based on fault travelling wave location. It increases high-speed signal acquisition circuit to collect fault travelling wave signal. While in order to transmit the data of failure travelling wave to merging unit (MU) for secondary equipment to make a fault distance analysis, it proposes a new communication protocol between the collector of current transformer and MU in this paper. Furthermore, the design has been proved that the new electronic current collector can not only realize the basic acquisition of measurement and protection data, but also can realize the complete acquisition of fault travelling wave signal and achieve effective communication.