Arithmetic library of embedded system for control of a feeder protection relay

Kristijan Boček (2011) Arithmetic library of embedded system for control of a feeder protection relay. EngD thesis.

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Abstract

Feeder protection relay or FPR is a device designed to protect medium-voltage lines. It can also be used as a backup protection for transformers or high voltage lines. Generally it covers a full range of protective functions, control functions and local automation. In most cases, the protection relay can be defined as embedded system, which carries out certain (protective) function or more of them, in real time. An embedded system is a computer system designed to perform one or a few dedicated and/or specific functions, often with real-time computing constraints. ADSL modem is a modern example of an embedded system. Low cost combined with low power consumption puts restrictions on the type of CPU that an embedded system can have, normally it is low frequency (50 – 500 MHz) CPU without hardware FPU. The Main topic in my diploma work is how to deal with real numbers on such platforms without FPU. The problem is even larger because the FPR, to function properly, must in a very short time (few ms), perform thousands of complex calculations (data acquisition, AD/DA conversion, protections ...). The diploma work is based on computer systems with processor StrongArm (SA1110) and operating system Linux with RTAI.

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