The Application of Self-Adaptive Relaying Protection in Power System of Shengli Offshore Platforms

This paper focuses on the application of self-adaptive current protection principle in the power systems of Shengli offshore platforms. This new device using this principle overcomes the defection, such as its unchangeable fixed value of the conventional device and that it's easily affected by the operation mode of the system and the short circuit type. By fully utilizing the computer's potential memory capability, logical decision and mathematical computation ability, this protection device can automatically calculate the settings through the computation of the impedance from the location of itself to system equivalent power supply. By continuously monitoring the load current and autonomously setting the overcurrent protection, and introducing the inverse time-current characteristics, the technical problems in practice can be resolved. This protection method is sensitive and reliable.