• No.2, First Floor,8th
    Street,Nandanam Extension,
    Chennai - 600035
  • No.1073,15th Cross,
    30th Main, Banashankari
    2nd Stage, Bengaluru
  • Monday - Saturday
    9:30am - 6:30pm
    Sunday CLOSED

Electrical Audit

  • Home
  • .
  • Electrical Audit

Electrical audit of Earthing systems

JEF Earthing System ‘Health Assessment’ ensures the healthiness of complete Earthing system. It is important that the Earthing system is inspected periodically to ensure the effectiveness. Since the majority of Earthing System is buried underground/inaccessible, it suffers from “OUT OF SIGHT IS OUT OF MIND” syndrome. Unseen Components like Equipment Earth Conductor (Strip), Earth Grids / Mats which are buried or inaccessible, tend to be taken for granted or ignored, though they are crucial

As per CEA regulation 41 (xv) b, resistance of earthing system shall be maintained as low as possible such that sufficiently large fault current flows in the circuit and the breaker trips ON TIME to isolate the faulty circuit.

A Complete Earthing System with all its components- Equipment Earth Conductor, Earth Electrode, and Earth Grid / Mat should offer low resistance path for fault current to flow so that breakers trip in time to prevent accidents such as -Fire, Short Circuit, and Electric Shock and so on.

Need for JEF earthing health assessment audit

  • Normally Earth Electrode (Pit) Resistance alone is measured periodically. Electrical System is deemed to be safe with a low Earth Electrode Resistance.
  • The Integrity of Earth Conductor (Strip) between Earth Electrode and Equipment is rarely checked.
  • Hence Breaker may not trip even if Earth Electrode Resistance is low.
  • In reality, timely operation of the breaker (Electrical Safety) depends on the resistance of earth loop formed by equipment earth conductor (Strip), earth electrode and phase conductor.
  • System modifications and Deterioration of Earthing System can render the original design calculations of protection system (breakers) invalid.
  • JEF’s assessment methodology covers this crucial gap by checking all the above parameters, thereby ensuring timely operation of the breakers to prevent accidents/damage.
  • Carried out on live systems without Shutdown using sophisticated meters and practices.
  • By emphasizing and encouraging the use of right personal protection equipment.

The above products available in Aluminum, Copper, Galvanized Steel & Stainless Steel.

  • Design

    On deliverable basis
  • Supply

    On deliverable basis
  • Installation

    On deliverable basis

a) Earthing System Audits – EHV

Activity
  • Soil Resistivity Test
  • Earth Electrode Resistance Test
  • Riser Integrity Test
  • Grid Integrity Test
  • Effect of Corrosion
  • Touch and Step Potential Test
  • Modeling and Simulation of GPR, Metal to Metal Voltages and circulating currents
Methodology/Deliverable
  • Wenner Method
  • Fall of Potential or Stake Less Method
  • Ensuring Equipment Connection to Grid
  • Ensuring No Breakage in Grid
  • Available Conductor Area WRT Fault Current
  • Ensuring Human Safety
  • Computer Aided Software
Benefits
  • Pin Points Open Risers and Grid Conductors
  • Identifies locations with unsafe touch & step potentials in the substation
  • Compliance with Standards
  • Ensures Human and Equipment Safety

b) Earthing System Audits – LV

Activity
  • Soil Resistivity Test
  • Earth Electrode Resistance Test
  • Earth Loop Impedance Test
  • Prospective Fault Current Test
  • Riser Integrity Test
  • Effect of Corrosion
Methodology/Deliverable
  • Wenner Method
  • Fall of Potential or Stake Less Method
  • Whether within limits or not
  • Verify Breaker Activation & Tripping Time
  • Ensuring Equipment Connection to Grid
  • Physical Measurement
Benefits
  • Ensures timely tripping of breakers in case of a fault, thus preventing short circuit, fire, shocks and so on
  • Effective compliance with Safety Standards & Norms
Reference Standards

IEEE 81-2012

IEE Regulation

CEA regulations for measures relating to safety and electric supply - 2016 (Draft)

IEEE 81-2012

IEEE 80 – 2013

IS 3043

BS 7430

CBIP manual

Deliverable

Detailed Report consisting of
  • 1. Measured data at site.
  • 2. Anomalies and Defects Observed.
  • 3. Recommendations for rectification.
  • 4. Site Photographs