Functional reliability assessment of the phasor Measurement unit
Now management of the power system modes uses the Wide Area Measurement System on the basis of the Phasor Measurement Unit (PMU). The measured by PMU signals are synchronized by means of global navigation systems (e.g. GLONASS), that allows to carry out simultaneous measurements in the buses as much as remote from each other. Purposes and methods of researches: In paper there are determined identification ele-ments, which is defining functional reliability of the phasor measurement unit in the duplicated execution, and assessed its availability on the Markov state graph basis of seven main units as a part of the device. Approach to an availability assessment of the block, which is containing the GLONASS receiver and the crystal oscillator, is in detail considered. Numerical assessments of reliability: On the basis of the numerical characteristics received by Young Vang, Wenyang Li & etc. parameter values of block reliability and the device in general are evaluated. Assessment Results show that PMU availability is 0.99974 at duplication of its measure-ment process. that is comparable with availability of the protection and automatic equipment. PMU hardware reliability allows to build monitoring and operating systems for power system.