Analysis of Microprocessor Based Protective Re-lay's (MBPR) Differential Equation Algorithms

TL;DR

This paper analyzes the differential equation algorithms used in microprocessor-based protective relays, highlighting their advantages in accuracy, error tolerance, and immunity to distortions like DC-offset in power system protection.

Contribution

It provides a system-level analysis of differential equation algorithms in MBPR systems, emphasizing their robustness and widespread application in power system protection.

Findings

Algorithms are immune to DC-offset distortions.

Differential equation algorithms are effective for various power system components.

Error analysis shows robustness under abnormal conditions.

Abstract

This paper analyses and explains from the systems point of view, microprocessor based protective relay (MBPR) systems with emphasis on differential equation algorithms. Presently, the application of protective relaying in power systems, using MBPR systems, based on the differential equation algorithm is valued more than the protection relaying based on any other type of algorithm, because of advantages in accuracy and implementation. MBPR differential equation approach can tolerate some errors caused by power system abnormality such as DC offset. This paper shows that the algorithm is a system description based and it is immune from distortions such as DC-offset. Differential equation algorithms implemented in MBPR are widely used in the protection of transmission and distribution lines, transformers, buses, motors, etc. The parameters from the system, utilized in these algorithms, are obtained from the power system current i(t) or voltage v(t), which are abnormal values under fault or distortion situations. So, an error study for the algorithm is considered necessary.