ELECTRICAL SAFETY & ARC FLASH HAZARDS ANALYSIS

Introduction :

In electrical system, each equipment subjected to electrical static & electromagnetic forces, hence protection devices are provided to isolate the equipment from the system whenever there is a possibility of exceeding these limiting forces. However, whenever fault develops in any or combination of equipment’s of generation, transmission, distribution and utilization, there is sudden disturbance of these forces resulting in an inrush of currents & voltages build up in micro seconds which may result in Fire in equipment’s and damage of many plants equipment

  • Transformer windings may get deformed and burnt,
  • The forces may be so high that circuit breakers may implode, Insulators may shatter, the equipment like CT’s and CVT’s /PT’s may explode, conductors may  snap and entire substation may be on fire.
  • Utilization equipment like Motors, Power Capacitors, and Power Electronic Equipment may get damaged.
  • Every equipment connected with power supply is susceptible for damage   depending on the nature of fault and working of its isolation.
  • Effects on other running equipment whenever a load is suddenly added or thrown off in the system.
  • Harmonic Voltages & Currents affecting the system components and their control.

It is very essential that, we know the above mentioned behavior of the system well in advance, so that corrective measures can be planned and implemented accordingly. This requires a holistic approach and cannot be studied on case-to-case basis because systems are inter-connected electrically and any abnormality in one section affects the system and equipment in the other sections.

This is the reason why system study shall be done, to take care of impending problems and this study shall be repeated as and when some major changes are contemplated in the system.

In electrical systems, finding reasons is knowledge based, analytical, time consuming and tedious. Timely decision makes the implementation easier.

The proper system study and decisions implemented based on such analysis and recommendations save the company a lot of trouble, which might have been catastrophic for the organization.

As per OSHA & NFPA 70E Safety regulations, employee safety is most important while working. “The Employer shall ensure that each employee exposed to Electric Arcs shall not wear clothing that could increase injury when exposed to these Arcs”. NFPA-70E includes “The Employee shall implement and document overall Electrical Safety program that directs activity appropriate for the voltage, energy level & Circuit conditions”.

From Safety point of view, Electrical Safety auditing shall be conducted. NFPA-70E, revision guides, “An Electrical Safety program shall require auditing of the work being performed of an identified frequency to help assure that principals & procedure of electrical safety programs are being followed. All electrical safety procedure shall be reviewed & revised, based upon the auditing findings on frequency no greater than 3 years.”

ISPMP provides its services for Electrical System Studies using software to simulate performance of your power distribution network, ISPMP can identify the deficiencies/problems in the system and also dangers to working personnel due to any electrical short circuits in your network by analyzing network.

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