The sensor for the SF6 characteristic decomposition gas based on the non dispersive infrared technology(NDIR) is designed. The system adopts the single light source and the dual wavelength optical structure, and further develops the optical sensor detection system for SF6 decomposition products. The system adopts single light source and dual wavelength structure to eliminate the unstable factors of the measurement system and has the high measurement accuracy. On the basis of effectively obtaining the time series of SF6 decomposition product volume fraction, the SLFRWNN(1, N) system model is applied to fit and predict it, and the high-precision fitting of gas volume fraction and prediction and analysis of gas concentration in wide area time domain are realized. The combination of the NDIR technology and system SLFRWNN(1, N) model provides novel method for the rapid measurement and prediction of SF6 decomposition gas in gas insulated switch-gear.
In the process of the construction of China's new power system, we will vigorously promote the research and development of UHV power equipment and the wide application of power electronic devices. UHV power equipment has complex insulation structure and huge volume, bear impact energy load of wind power and photovoltaic of new power system for a long time. It will cost a lot to carry out on-site operation and maintenance tests. Digital twin technology is becoming more and more perfect, and new power system construction is gradually introduced from automobile, aviation and other manufacturing industries. Based on this, this paper introduces the digital twin technology into the high-end power equipment of the new power system, and carries out on-site operation and maintenance simulation test and functional response analysis under high current, high voltage and multi harmonic loads according to its twin model. From the four sensing dimensions of mechanical vibration, gas composition, optical vision and electrical parameters, the improvement of intelligent sensing technology of new power system equipment is analyzed, and the interaction between on-site operating parameters and digital twin model data is realized. On the other hand, GPU computing power expansion technology supporting digital twin multi-source sensing technology is proposed, which can effectively support the dynamic behavior simulation monitoring of equipment from 10-5 seconds to 103 seconds, and the operation life evaluation strategy of high-end equipment is proposed. This paper focuses on the 3D construction of the digital twin model of the high-end equipment of the new power system, and its research method can be extended to the construction of the whole network digital twin model of the new power system. The research results can provide theoretical guidance and technical reference for the application of digital twin technology in high-end power equipment scenarios, and effectively support the safe and stable operation of the new power system with "double high characteristics".
Stranded conductor is widely used in the transmission line, and corona of stranded conductor is one of key problems in the operation of transmission line, so the research on the surface electric field distribution and corona onset voltage of stranded conductors provides theoretical basis in the design of transmission lines. In the paper, a calculation method of surface electric field distribution and corona onset voltage of stranded conductors using corona onset criterion and FEM was proposed. The simulation calculation results indicate the corona onset voltage increases with the increase of the overall conductor radius and the number of external strands as expected, and tends to be saturated. Besides, the relation between surface roughness coefficient and the overall conductor radius, including the number of external strands was analyzed, and the efficiency of the calculation method proposed was proved based on the informed experimental data.
The insulation structure research and design optimization of ±1100kV DC SF6 gas insulated through wall bushing is an important basis and technical key for the core technology research and device development of ± 1000kV DC SF6 gas insulated through wall bushing. It is also an important basis for the formation of bushing structure design and process technology, which is of great significance to improve the electrical performance of bushing. The ±1100kV DC SF6 gas insulated through wall bushing monomer bears the full voltage and current of the system, and the distribution of internal insulation electric field is complex. At the same time, it is affected by many factors such as electric field shielding, insulator surface charge accumulation, material non-linearity and so on. The improvement of voltage level puts forward higher requirements for bushing structure type, material performance and electric field uniformity regulation. Based on the actual engineering and scientific needs, this topic carries out the insulation structure research and design optimization of ±1100kV DC SF6 gas insulated through wall bushing. The design and selection of the bushing insulation structure, high current carrying structure and mechanical support structure based on multi physical field analysis. Through electrical, thermal and mechanical analysis, design and select reasonable structural type for casing under the action of multiple factors. Design optimization of typical insulation structure of bushing. The electric field simulation and intelligent algorithm are used to design the configuration parameters of shielding electrode and epoxy cast insulator, optimize the electric field intensity on the electrode surface, inhibit the charge accumulation on the insulator surface and improve the flash-over voltage of insulator.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.