possible to the steady state load current. This can be achieved only when the SSPC is ‘matched' to the load which requires a careful analysis of the interactions between SSPC and load during switch-on since this represents the most critical case. In order to give an example how such an analysis looks like, switch-on of a resistive load with input filter by means of a SSPC has been investigated in Appendix I. The constraints derived in the frame of the analysis are some equations which relate sizes of reactive filter elements to the limitation current of the switch. It is quite obvious that this load-switch dependence requires new approaches for the design of power distribution boxes because in most cases the SSPC is to be changed when the load changes. As a response to this new situation AEG has conceived the Modular & Standardized Distribution Box (DB). An artist's impression of the external layout is given in Fig. 6. The basic idea is that a carrier structure, the Branching Unit (BU) can accommodate up to six exchangable Modular power Outlets (MOs). The BU is of relative simple design, it just provides the following functions: • switching of power feeder in order to cut DB electrically from the distribution system (for safety reasons); • branching of power feeder in order to supply individual MOs; • sensing of voltage and current; • data interface to the STAUs (Standard Acquisition Unit). The BU shall become an integral part of all load centres where users install their
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