Modeling of operating modes of relay protection in electrical networks with insulated neutral

A Aluynov,E Gracheva,A Nemirovskiy,O Vyatkina,V.A Golenishchev-Kutuzov

doi:10.1051/e3sconf/202128801100

A Aluynov, E Gracheva + Show 3 more

Open Access

https://doi.org/10.1051/e3sconf/202128801100

Copy DOI

Abstract

This work aims to study relay protection and automation in insulated neutral networks to identify additional criteria for choosing the type of earthing. To calculate the single-phase earth fault currents as a function of the operating modes of the electrical substation, the 10 kV network of the electrical substation was simulated in the software package. The advantages and disadvantages of centralized and non-centralized protections are shown. The paper presents the sequence of actions necessary for the correct operation of directional zero sequence protection.

Highlights

An in-depth question on the earthing of the network neutral arises at the stage of electrical project design during the construction of new, as well as the reconstruction of the existing medium voltage substations [1,2,3,4]
The 2–35 kV electrical networks can be provided both with an insulated neutral and with a neutral earthed through an arc suppression reactor or a resistor [5,6,7]
The 110 kV switchgear (SG) is formed according to the scheme "Two blocks with switches and a non-automatic repair jumper on the side of the lines"; the 35 kV SG is "One working section of busbars sectioned by a switch"; the 10 kV SG is "One bus system sectioned by a circuit breaker"

Summary

Introduction

An in-depth question on the earthing of the network neutral arises at the stage of electrical project design during the construction of new, as well as the reconstruction of the existing medium voltage substations [1,2,3,4]. This problem consists in the fact that there are no clear instructions for solving this problem in the electrical installation rules. The aim of this work is to study relay protection and automation in networks with insulated neutral, to identify additional criteria for choosing the type of earthing. The 110 kV switchgear (SG) is formed according to the scheme "Two blocks with switches and a non-automatic repair jumper on the side of the lines"; the 35 kV SG is "One working section of busbars sectioned by a switch"; the 10 kV SG is "One bus system sectioned by a circuit breaker"

Objectives

Methods

Conclusion