New high-current switch design theory and application

Title: New high-current switch design theory and application ofAuthor: Zheng XiangshenDegree-granting unit: Dalian University of TechnologyKeywords: vacuum generator circuit breaker;; main interrupter;; auxiliary interrupter;; current transfer;; permanent bodySummary:With increasing energy consumption and energy use patterns of the high function, high-current technology to become the electricity production, transmission
, Transformation, control, etc. is rapidly Magnetic lifter emerging field. In this paper, two high-current switching power projects as the background, a new study
Parallel double fracture type vacuum generator circuit breaker and load large current aluminum dedicated switching switch design theory and application.
This design principle based on the current transfer control technology combined with the parallel double fracture type vacuum generator circuit breaker (Vacuum
Generator Circuit Breaker, VGCB). Different from the traditional design approach, this paper asynchronous dual action opening interrupter
Way off, you can choose different parameters of http://www.999magnet.com/products/131-magnetic-lifter vacuum interrupter in parallel. Main interrupter (Main Vacuum Interrupter, MVI) load-bearing
Tam rated current, while the auxiliary interrupter (Auxilary VacuumInterrupter, AVI) is mainly responsible for breaking fault current task. By
Appropriate structural arrangement allows two circuit interrupter branch current distribution values ​​with VGCB design requirements. According to the nature of breaking current
Different set VGCB in breaking load current and fault current flow when the appropriate action to reduce contact erosion. Obtained through experiments
Rated short time withstand current distribution under current circumstances, and as a basis to calculate the VGCB various parts of the force. Effect and thermal effect by force
Should be a comprehensive analysis, VGCB closing can be achieved in the state long-term stability.Source through the system, as well as out of step generator source
Fault current equation analysis of current changes, combined with the mathematical model of the current transfer process, get three sources of dynamic fault current diverted
Process changes the formula, and based on the simulation results obtained current trends in the transfer process and influencing factors, and to determine the MVI and AVI Tripping time
With the method. Through the current simulation, the new VGCB can achieve at rated short-circuit breaking current under the conditions of current transfer and the current
Transfer process and the type of fault current source, the initial phase angle, the system device parameters, the main interrupter contact separation time and other factors
Related to some scholars, only a single break current, fixed sub-transfer analysis of the current gate time limitations.Combination of applied research, the
Wen a parallel double fracture type vacuum generator circuit breaker prototype. By testing agencies Tripping coil permanent magnet excitation time, further reducing
Short excitation time requirements. Through the current distribution experiments to prove the design of the switch circuit structure can achieve a reasonable current distribution. By
Current transfer experiments and simulation analysis compared to determine the reasons for the transfer and current trends, and identify the reasons for the simulation error.
By temperature experimental prototype to meet state regulations, propose ways to further improve the thermal conditions.In this paper, groups of small
Sub-parallel synchronous switching method of closing the current design of a large load switching switch to non-power switching cell to achieve the purpose. This
Developed a work flow switch switching, and switching by calculating the electrical parameters of the switching process simulation, this switch is designed
To achieve large current is transferred. By switching the dynamic thermal stability analysis, multi-switch parallel structure to meet the relevant fracture
Co-state stable operation needs.Degree Year: 2009