Modern Computer-based Supervisory Control System for High Current Laboratory

摘要

This paper presents the design and implementation of a modern sequential control system for a high current test laboratory. It is intended to configure the test facility for the execution of tests that are applied to power electric devices such as transformers, fuses, reclosers, power cables, etc. The new system is integrated by four main modules: field sensors and actuators, a conditioning module for digital I/O, a digital I/O module and the supervisory control software running on a morkstation and developed over a virtual instrumentation platform. Traditionally, supervisory control systems use wired logic and passive circuitry to control test sequences. In such a system maintenance and failure detection is complicated. The development of this new system had several restrictions arisen from the operation of the high current laboratory; the most important was that the programmed schedule was not allowed to be modified. So the installation and test process has been very well planed and very carefully executed. In order to guarantee a smooth transition both control systems were available during the acceptation process. The upgraded computer-based supervisory control system reduces the required space for hardware, improved reliability and avoids electric shock risks for the operation personal. The architecture of the new supervisory control system and the logical control sequence used for a high current test is also described.