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Showing posts from March, 2016

STEP AND TOUCH POTENTIAL: REDUCE ELECTRICAL HAZARD AND IMPROVE SAFETY AWARENESS

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Understanding of Step and Touch Potential in Power Transmission System to Reduce Electrical Hazard and Improve Line Crew Safety.The purpose of this article to focus on some less familiar but the most important safety induction like- step potential or step voltage, touch potential or touch voltage. We also try to give you some pint-size attention on basics of reducing touch potential and why power grid substation yard needs washed clean gravels or stone rather than others. We are here using some less familiar literature; means, we everybody knows the importance of electrical safety. But todays discussing topics like step potential or touch potential is little professional and not well known to all, even not to all electrical engineer. Especially who deals with power transmission and distribution substation they are very well familiar with these terms step and touch potential. What Is Step Potential or Step VoltageStep potential simply is the potential or voltage difference between a foot…

EARTH ELECTRODE RESISTANCE MEASUREMENT

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Procedure of Earth Electrode Resistance Measurement by Digital Earth Tester:
To ensure the system with good earthed and not buried within the resistance area of others electrode. Earth resistance requirements for all systems are not same, but everywhere it is required to keep less to fulfil the system requirements.
Now we are going to measure the earth electrode or grounding rod resistance measurement by Earth Tester. Previously, earth tester was totally horrible, manual or hand rotating DC generator type, receiving accurate reading was difficult. Right now lots of Digital Earth Testers are available in the market.
Measuring the Earth Electrode resistance we test actually to- Test the earth electrode resistance;Ascertain the suitability of the location of the electrode;Ensure that the electrode is not buried within the resistance area of another electrode.
Test Equipment Ranges:We are using simple digital Earth Tester having Red-Yellow-Green 3 test cord; two test spikes, total Ohm range …

WHAT IS THE EQUIPMENT CLASS AS PER INSULATION GRADE

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The Equipment Classes Considering the Insulation Level to Protect Electrical Shock It is almost impossible to go the end of a list where electricity is necessary in our life today, and we everybody will agree that electricity is the closest friend in our daily-life. Yes, electricity is very close friend and helping us every moment; but don’t forget, it will make no mistake to injure you even to kill by shock if you are not alert before it getting the chance. Bearing in mind the electrical shock, a safety measure must ensures in our electricity operated home appliances and equipment. Electricity shock protection procedures are different depending on the tentative shock level. Considering the electric-shock preventive insulation level the equipment are classified on three types as follows: vClass-I Equipment; vClass-II Equipment; vClass-III Equipment.
Class-I EquipmentTheelectricalequipment which includes a means for connection of Exposed Metallic Parts (EMP) of the equipment to the Earth Co…

AGGREGATES CIVIL WORKS FOR UNDERGROUND CABLE INSTALLATION

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Aggregated Civil Works and Construction Materials Management in Cable Installation SiteThe underground cable installation project is not a contemporary high-tech major aggregates civil work, but some special complaint and engineering practice should followed to keep the power cable safe and liveliness for long lifetime.
This article is introduced on the aggregated civil work for high voltage electrical power transmission underground cable installation project. The scope of civil works for such project as highlighted as below:
·Cable trench cutting, bedding, backfilling; ·Cable protection RCC slab; ·Pipe trench, bridge trench, road and canal crossing etc; ·Piling for bridge trench and terminal equipment structure; ·Cable joint and cable earthing or grounding RCC Bay construction; ·Concrete structure and foundation for outdoor steel structure, etc.
To ensure quality and follow engineering layout the aggregates for all concrete should be take approval of the Engineer. Un-reinforced mass cement …

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