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In this paper, safe, reliable, economic and effective protection configuration plan are formulated, aiming at electrical railroad traction station power supply project. It is from the perspectives of electrical railroad traction station power supply protection characteristics, protection configuration and the relationship between power grid stability and traction station main transformer security. Meanwhile, simplification and optimization plan are proposed.

The planned upgrade of instrumentation sensitivity in the ATLAS experiment of the Large Hadron Collider (LHC), at CERN, calls for a new type of power distribution architecture. Moreover, power supplies require DC-DC power converters able to work in very hostile environment and maintaining high level of Reliability, Availability, Maintainability and Safety (denoted as RAMS requirements) during the experimental activity. Two main issues need to be discussed: first, electronic devices and equipment must operate in very high background of both charged and neutral particles and high static magnetic field and, second, the increase of the radiation background and the requirements of new front-end electronics are indeed incompatible with the current capability of the actual distribution system. The APOLLO R&D collaboration, funded by the Italian Istituto Nazionale di Fisica Nucleare (INFN), aims to study dedicated topologies of both distribution system and DC-DC power converters and to design, build and test demonstrators, developing the needed technology for the industrialization phase. The collaboration has designed a 3kW, 280V-12V converter (MC) based on the Switch in Line architecture (SIL), a DC to DC phase-shifted converter characterized by a disposition in line of the MOSFETs with good soft switching performances, and in the last year many steps have been taken to enhance the power dissipation and the reliability and to improve the general features of the designed converter. In particular a new water heat sink was designed on the basis of TFD simulation accounting for the layout of the specific converter. Experimental activities in order to characterize both thermal and electrical features of the MC confirm the correctness of the adopted design criteria.

Based on the DSP, a kind of induction heating power supply of high frequency is designed. The switching element is IGBT. The control technology of PID adopted can adjust the power in time. The application of digital phase-locked loop technology in high frequency occasion which is based on DSP and DPLL makes the phase lock has fast dynamic property and steady-state performance of high precision. It realizes reliable load frequency tracing and reliable inverter mode control. At the same time, it increases work efficiency and power factor of the inverter. Thus, it helps achieve the purpose of promoting the digital control of high frequency induction heating power supply. It guarantees the heating efficiency, stability and anti-jamming capability in the system. In a word, it is of high utility value.