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AUDIT SERVICESEarthing Health Assessment
Instrumentation Earthing System
Lightning Protection Audit
Power Quality Studies
Electrical & Fire Safety
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JEF Earthing System ensures the healthiness of complete Earthing system. It is important that the earthing system is inspected periodically to ensure the health and 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 on time to prevent accidents such as -Fire, Short Circuit, and Electric Shock and so on.
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Earthing Audit is needed because earthing deteriorates over time due to various reasons such as Chemical Properties of Soil leading to Environmental Corrosion, Thermal & Electrical Stress on joints due to Electrical Faults, Galvanic Corrosion in some cases and Improper Workmanship.
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.
Majority of faults in the system are phase to ground.
Majority of earthing system is below the ground.
Failure of Electronic Cards & Equipment
Failure of ELV assets
Maloperation of Ground Fault Protection
System Derating due to Power Quality Issues
Neutral Voltage shift due to rise in Neutral to Ground Voltages
Noise Interferences Resulting in Nuisance Tripping
Risk to human life
Grounding Audit is not just the measurement of resistance.
Resistance measurement may not give holistic view of the condition of earthing system.
Ground grid has multiple parallel paths, few open risers/ground connections/ grid disconnections will not impact the overall resistance.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.
Reduction in equipment failures by about 38-40%.
Enhanced reliability of equipment
Reduces nuisance tripping
Improves human safety
Pinpoint open and defective risers. Corrective action - excavate that specific point and rectify
Identify specific areas of Grid Islanding (Intra Grid). Corrective action - provide alternate connections
Identify grids which are not connected (Inter Grid). Corrective action - provide alternate connections
ACTVITY
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 earth grids for safe touch & step potentials.
ACTVITY
Soil Resistivity Test
Earth Electrode Resistance Test
Earth Loop Impedance Test
Prospective Fault Current Test
Riser Integrity Test
Effect of Corrosion
Cost effective solution to overcome the hazards and mitigate risks.
Pin point open or weak joints in a buried earthing grid which can severely impact safety and cause unexplained failure of equipment.
Identifies locations with unsafe touch & step potentials in the substation.
Ensures timely tripping of breakers in case of a fault, thus preventing short circuit, fire, shocks and so on.
Ensures Human and Equipment Safety.
Site Survey and measurements from qualified and experienced Engineers.
AIS & GIS Substations, Commercial Buildings, Retails outlets, Warehouses, Data Centers, Factories, Manufacturing plants, Oil & Gas, Metro rail, Process plants, Wind & Solar Plants, Tank farms, Critical structures like communication towers, power plants and more.
IEEE 81-2012
IEE Regulation
CEA regulations for measures relating to safety and electric supply - 2021 (Draft)
IEEE 80 – 2013
IS 3043
BS 7430
CBIP manual-339
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