Approach for preliminary determination of the type and number of vertical rods in grounding installations

Petar Petrov,Krasimir Ivanov,Georgi Velev,A Bulat,O Voloshyn,Y Kryzhanivskyi,O Zhevzhyk,V Heyets,B Liu

doi:10.1051/e3sconf/202016800013

Petar Petrov, Krasimir Ivanov + Show 7 more

Open Access

https://doi.org/10.1051/e3sconf/202016800013

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Abstract

The paper inhere describes a new practical approach for fast preliminary onsite estimation of the number and the kind of vertical grounding rods as essential components of all grounding systems in electrical power facilities, networks and installations in industry, communal services, mining enterprises, etc.

Highlights

The protective grounding is a main technical measure for protection against electrical shocks intended for class I of electrical devices and consumers in insulated from earth electrical power networks and installations and an additional safety measure along with zero-bonding in directly earthed electrical power networks and installations
The maximum permissible values of the transient grounding electrodes’ resistance in electrical installations with rated voltage up to 1000 V and the impulse grounding resistance in lightning protection systems have norm regulated values as defined in the Bulgarian national standards [1, 2], all synchronized with the EU and some international regulations [3, 4]
The achieving of the desired grounding resistance values is realized by installing grounding systems, which requires design and project activities following a specific methodology

Summary

Introduction

The protective grounding is a main technical measure for protection against electrical shocks intended for class I of electrical devices and consumers in insulated from earth electrical power networks and installations and an additional safety measure along with zero-bonding in directly earthed electrical power networks and installations. In cases of deviations from the required resistance values it is necessary the grounding system to be repaired and renovated in order to improve the transient grounding resistance Such reconstructions may include: construction of a new grounding system; installation of additional grounding electrodes in order to lower grounding resistance for meeting the requirements. All this makes topical the following tasks: − Preliminary estimation of the type and number of vertical grounding rods, options for their installation and repair costs; − In cases of deviations from the required resistance values - express evaluation of the. − An approach that gives a preliminary and fast reasonable technical solution about the future design of the grounding system

Theoretical model of the proposed approach

Numerical example for application of the method

Findings

Conclusions