Electrical power systems primary configurations

The following items should be considered when planning an electrical power distribution system s primary configuration. 

Electric currents can vary from fractions of a volt such as in communications signals to millions of volts in power systems. The currents carried by the conductor range from microamperes to millions of amperes. With this wide range of electrical conditions the types of plastic that can be used are different no one plastic meets the different operating conditions. The selection of the materials and the configuration of the dielectric to perform under the different voltage, current, and frequency stresses are the primary design problem in electrical applications for plastics. 

The Primary Protection System (PPS) for the Sizewell B Nuclear Power Plant (NPP) was the first safety-critical software based system to be used in a UK NPP. The software was developed by Westinghouse Electric and consisted of approximately 100,000 lines of software written in PL/M-86 and ASM-86 (a structured version of 8086 assembler). (There were additionally a further 100,000 lines of configuration data.) The software, not including the configuration data. 

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