Earthing Design Calculation for 380/132/11kV Substation

What you'll learn

From Scratch , Complete Earth Design Calculations of 380/132/11kV Substation

What Parameters are required fro Earthing design Calculations of Grid

Step by Step Guide of each step

Actual Substation Earth Design Calculations explained

Requirements

Basic Understanding

Description

Dear All,

Explained in detail topics step by Step.

Introduction

Collecting information of substation, total line and transformer, etc

Collecting Network Data

Explaining Short Circuit Level, Fault Clearance , Thermal

Collecting Data at Site for Specific Soil Resistivity

AEMC - Wenner Soil Resistivity Testing Explained - Using 6472

Difference between resistivity and Resistance

How to Calculate Thermal Design of earthing electrode and conductors

Calculating Area for Conductor as per IEEE Std 80 2000

Discussing Fusing temperature, Ambient temp, Material Constant, Thermal Capacity, Thermal Coefficient

Discuss the Design Software Used for Calculations

Introduction to SES CDEGS _ FCDIST - Getting Started

Calculation of Grid Earth Resistance

Standard describing Minimum Requirement of Earth Resistance

Tolerable Touch and Step Potential

The formula for Step & Touch Potential

Deteation of Maximum Grid Current

Deteation of Ground Potential Rise

Design of earth grid with respect to touch and step voltages

Single-Electrode/Touch Voltages/Worst Spherical

Design Criteria for step & Touch Potential

Foundation Earth Electrodes

Indoor Earthing System

Outdoor Earthing system

Input to software

The grounding system in the substation is very important. The functions of grounding systems or earth mat include:

Ensure safety to personnel in substations against electrical shocks.

Provide the ground connection for connecting the neutrals of stat connected transformer winding to earth ( neutral earthing ).

Discharge the overvoltages from overhead ground wires or the lightning masts to earth. To provide a ground path for surge arresters.

Provide a path for dischag the charge between phase and ground by means of earthing switches.

To provide earth connections to structures and other non-current carrying metallic objects in the sub-station (equipment earthing).

In addition to such a grid below ground level, earthing spikes (electrodes) are driven into the ground. They are connected electrically to the earth grid, equipment bodies, structures, neutrals, etc. All these are connected to the station earthing system by earthing strips.

If the switchyards have a soil of low resistivity, the earth resistance of the earthing system would below. If the soil resistivity is high, the mesh rods are laid at closer spacing. More electrodes are inserted into the ground.

Thanks

Muhammad Kashif

Who this course is for:

Student, Eeer, Professionals



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