Staying Alive When the Power Lines Come Down: Post-Storm Safety and Electric Utility Familiarization
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Warren Rogers, a safety supervisor at Connecticut Light & Power, gave a presentation on electrical safety. He discussed the components of an electrical system, including substations, transmission lines, and distribution lines. He explained voltage, current, and resistance. Rogers warned about the dangers of downed power lines and improper generators. He reviewed safety distances and the risks of step and touch potential near downed lines. Rogers also discussed the effects of electrical shock and current on the human body. He emphasized the importance of staying safe in vehicles near downed lines and not touching any wires until utility crews say it is safe.
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Kinds of Faults in the power system.pptx
A fault in a power system is any abnormal condition involving electrical failure of equipment like transformers or generators. There are two main types of faults: open circuit faults caused by a failure of conductors, and short circuit faults resulting from insulation or conducting path failures. Unsymmetrical faults like single-line-to-ground are the most common, accounting for 70-80% of faults, while symmetrical three-phase faults are rare but severe. Faults can be caused by weather, equipment failures, human errors, or fires and can damage equipment if not cleared quickly.
Electrical safety
1. Electrical safety is important to prevent electrical shock and injury. The human body can withstand brief currents under 30mA but higher currents and voltages can cause pain, muscle contraction, burns and even death.
2. Proper grounding and earthing of electrical systems and appliances is necessary to provide an alternative path for faulty currents and protect against shocks. Devices like fuses, circuit breakers, and earth leakage circuit breakers automatically cut off power in fault conditions.
3. Special equipment like multimeters are used to measure electrical values and ensure safety. Following precautions like periodic inspection and maintenance of wiring and appliances can prevent electrical accidents.
Electrical Safety.pptx
1) Electrical shocks occur when electrical current passes through the body, such as touching a live wire and an electrical ground or two wires at different voltages.
2) Electrical injuries can be direct, such as electrical shock, burns, or internal damage from involuntary muscular contractions, or indirect from falls which account for 30% of electrocutions.
3) The probability of effects from electrical shocks range from a slight tingling sensation at 1mA to cardiac arrest and probable death at 10,000mA.
Electrical Safety.pptx
1) Electrical shocks occur when electrical current passes through the body, such as touching a live wire and an electrical ground or two wires at different voltages.
2) Electrical injuries can be direct, such as electrical shock, burns, or internal damage from involuntary muscular contractions, or indirect from falls which account for 30% of electrocutions.
3) The probability of effects from electrical shocks range from a slight tingling sensation at 1mA to cardiac arrest and probable death at 10,000mA.
Electrical safety
Electrical Safety. Electrical hazards can cause burns, shocks and electrocution (death). Assume that all overhead wires are energized at lethal voltages. Never assume that a wire is safe to touch even if it is down or appears to be insulated.
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Lecture-PS-faults-description-recorded-30032020-110109pm.pptx
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Causes, Effects and Solutions of Poor Quality Problems in the Power Systems
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Staying Alive When the Power Lines Come Down: Post-Storm Safety and Electric Utility Familiarization
- 1. Warren Rogers Safety Supervisor, Eastern Connecticut Connecticut Light & Power warren.rogers@nu.com Staying Alive When the Power Lines Come Down Post-Storm Safety and Electric Utility Familiarization Michelle Lowther Principal Continuity Housing michelle@continuityhousing.com
- 3. Electrical System Awareness - Surviving the Aftermath and the Beforemath Warren Rogers - CL&P Safety
- 5. What Is Electricity? Voltage Current Resistance The flow of electrons from one atom to another in a complete circuit Strength of the electrical pressure Electric flow in a conductor Resistance to the flow of current (in Ohms)
- 13. Insulators Cross Arm Recloser Primary Voltage Conductors – 3 phase Secondary Voltage Triplex
- 14. Shy bird Bare copper primary Primary Secondary Phone/cable Transformers Fuses
- 15. DANGER OSHA/NU’s Rule for NON QUALIFIED PERSONS MINIMUM - 10’ FOOT CLEARANCE FROM ANY OVERHEAD LINES
- 18. FREE SERVICE
- 19. Improperly installed generators have the potential to back feed downed wires
- 20. Step Potential - The potential gradient developed across the surface of the earth as a result of current flowing through the earth Touch Potential - The potential measured from an object that may be touched and the earth one would be standing on
- 21. Broken Primary
- 22. Could the guard rail be energized ?
- 23. Phase of 23kv after three shots of Recloser
- 24. Phase landed here Was there any step and/or touch potential?
- 25. Car vs Pole - Primary knocked off pole onto street, then car hit hydrant flooding street. 2 Good Samaritans died running to help car when they stepped into water with down Primary. Seven others seriously injured attempting to rescue the 2 GS’s.
- 26. Effects of Electrical Shock Current (amperage) is the killing factor in electrical shock. EFFECTS OF AC CURRENT ON AVERAGE HUMAN 1 Milliampere (mA) Slight Tingling - Threshold of perception (1/1000 amp) 5 mA Sensation of shock - can let go Accepted as maximum harmless current (GFCI TRIPPED) 6-30 mA Painful Shock - Still have muscular control 50-150 mA Painful Shock - Loss of muscular control 200 – 500 mA * 1,000 – 4,300 mA* Ventricular Fibrillation - Heart leaves its * OSHA beating pattern and goes into a vibrating mode before shutting off 10,000 mA Cardiac Arrest, Severe Burns & probable Death * OSHA 15,000 mA Typical home circuit breaker (Breaker in panel tripped)
- 27. Ground Fault Circuit Interrupters - GFCI – Saves lives !
- 28. Why Men Invented GFCI’s
- 29. Fatality - exit wound after aluminum ladder contact w/secondary service
- 30. Stay Alive – Stay in Vehicle, Call 911 Tell by-standers to stay back Stay in vehicle until utility company tells you the area is safe Never trust any wire, primary Or Secondary, to be safe until the utility rep says it is !!
- 31. Michelle Lowther Principal Continuity Housing michelle@continuityhousing.com (832) 594-8286 Housing for critical personnel when you need it most.