Abstract
The variety of microprocessor relay protection terminals today requires the engineer to know the features of the methods for calculating relay protection settings based on each of the terminals. Such features include, for example, return factors, requirements for measuring equipment, as well as step and range, adjustment of setpoints. Several manufacturers of microprocessor relay protection devices offer designers their own systems for automated calculation of settings. However, each of these systems has its own logic for presenting the initial data, which also creates certain difficulties in performing calculations. Thus, the urgent problem is to develop an integrated system for automated calculation of relay protection settings, which allows, based on the initial data on the equivalent of the electrical network and the parameters of the main equipment of the substation, to calculate the short-circuit currents in the maximum and minimum modes and determine the protection operation settings based on various microprocessor terminals, taking into account their technical features. This paper presents a system for automated calculation of protection settings for a 6 (10) kV power line based on microprocessor terminals manufactured by STC Mekhanotronika LLC, RADIUS Avtomatika JSC, EKRA Research and Production Enterprise LLC and Schneider Electric JSC. The authors have developed algorithms for automated calculation of the maximum current protection and current cutoff settings based on the indicated protection terminals. And also, a software implementation of these algorithms was performed and an example of calculating the settings using the developed software package was given. The algorithms provide for the generation of warnings for the calculator about non-compliance with the requirements for protection sensitivity, going beyond the range of setting adjustment.
Keywords
computer-aided design system, relay protection, settings, sensitivity, overcurrent protection, current cutoff
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