Abstract
III
Abstract
With the implementation of China's strategic decisions of smart power grid, the research
and development of equipment that supported the smart power grid have to start. Intelligent
switchgear, as an important part of smart power grid, has gradually become a hot research
topic. Around the study of the feasibility, reliability, efficiency and the others of intelligent
switchgear have started. This thesis aims at the study on on-line monitoring of intelligent
switchgear oriented to intellignet electric grid. The concrete research is as follows：
1. Accroding to the function requirements of the system, presents the integrated scheme
of the system, and discussed the integrated scheme is feasibility. This part include many
details, such as, design and demonstration of the system structure; design and
demonstration of the on-line monitoring unit about Circuit Breaker and demonstration of
the on-line monitoring unit about switchgear insulation.
2. Designed the hardware circuit of Circuit Breaker on-line monitoring unit about
mechanical characteristics. That include the sensor selection, the DSP minimal system
design, the power circuit design of detection reference, the design about signal adjust
circuit of linear displacement, the design about signal adjust circuit of angular displacement
and the design about digital input circuit. In the end, it analysis and design the
electromagnetic compatibility (EMC) of those circuits.
3. Designed the software of the Circuit Breaker on-line monitoring unit about mechanical
characteristics. That include purposed the system software design principles, analysis the
system needs, design the functional Program, purposed software EMC design principles
and testing those program. Use the TMS320F2812 platform, processing and computing the
data that sampled analog signals with the FIR digital filtering and smoothing filtering
treated, realizes the on-line monitoring and the characteristic quantity local display.
4. Researched the Circuit Breaker on-line monitoring technology about mechanical
characteristics. That include two parts is system identification of on-line moitoring about
the mechanical properties and studies of multi-sensor fusion. This thesis, for on-line
moitoring about the mechanical properties，use the technology of system identification and
data fusion. Discussed that how to use little information to accurately assess the state of the
system and how to improve the monitoring accuracy.
5. Researched the on-line monitoring technology about insulation condition of
Switchgear. It include leakage current detection circuit design of apparatus insulator in
cabinet, ultrasonic discharge detection circuit design of high-voltage parts and moitoring
methods research about insulation condition. Based on the published data，designed the
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