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Electrical Safety Handbook > 6.0 Substations > Flashcards

6.0 Substations Flashcards

1
Q

What is the purpose of the automatic signal systems in most unattended substations?
a. To control the distribution of electricity
b. To summon electrical utility personnel in emergencies
c. To regulate the voltage in transmission lines
d. To monitor energy consumption levels

A

B

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2
Q

Why is it important for emergency responders to arrange familiarization tours of substations?
a. To learn about basic first aid techniques
b. To become familiar with the layout and hazards
c. To understand the operation of fire suppression systems
d. To observe routine maintenance procedures

A

B

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3
Q

What are some hazards present in substation buildings that can endanger emergency responders?
a. Wooden furniture
b. Compressors and oil-filled transformers
c. Rubber insulation
d. Plastic water pipes

A

B

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4
Q

What is the flashpoint of the combustible cooling insulating oil typically found in transformers?
a. 60°C (140°F)
b. 100°C (212°F)
c. 145°C (295°F)
d. 200°C (392°F)

A

C

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5
Q

According to provincial legislation, what procedures must electrical utility personnel follow when working in underground electrical vaults identified as confined spaces?
a. General safety guidelines
b. Specialized training only
c. Confined space entry procedures
d. No specific procedures required

A

C

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6
Q

What is the primary purpose of conservators in transformers?
a. To store excess electrical energy
b. To allow expansion and contraction of cooling oil
c. To regulate the voltage in transmission lines
d. To support insulators and high voltage conductors

A

B

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7
Q

What is the function of explosion vents in transformers?
a. To create a controlled explosion in case of fire
b. To relieve pressure in the event of an internal fault
c. To provide additional cooling during overheating
d. To prevent the escape of combustible gases

A

B

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8
Q

What is the purpose of metal structures built over electrical equipment?
a. To enhance the aesthetics of the substation
b. To provide additional support for cooling fans
c. To prevent the collapse of insulators during high temperatures
d. To support insulators and high voltage conductors

A

D

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9
Q

What is the potential hazard of collapses in metal structures over electrical equipment?
a. Release of toxic gases
b. Rupturing of porcelain bushings
c. Disruption of cable insulation
d. Breakage of porcelain insulators

A

B

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10
Q

What is the function of control cables in a substation?
a. To carry low voltage electricity for controlling equipment
b. To provide structural support for the substation
c. To conduct high voltage electricity to transformers
d. To serve as conduits for combustible gases

A

A

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11
Q

What is the purpose of cable trenches in a substation?
a. To provide structural support for the substation
b. To carry high voltage electricity to transformers
c. To carry control cables for equipment
d. To facilitate the flow of cooling oil in transformers

A

C

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12
Q

How can cable trenches contribute to the spread of fire in a substation?
a. By carrying combustible gases
b. By carrying leaked transformer oil
c. By facilitating the escape of PCBs
d. By conducting high voltage electricity

A

B

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13
Q

What are capacitors in a substation, and what hazard do they pose?
a. They store energy and can produce lethal voltages; pose an explosion hazard when heated
b. They are insulating devices; pose a risk of shock in case of a spill
c. They are cooling units for transformers; pose a risk of chemical exposure
d. They regulate voltage levels; pose a risk of fire during overheating

A

A

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14
Q

Why are some circuit breakers filled with sulfur hexafluoride (SF6) gas?
a. To enhance the odor of the gas
b. To reduce the risk of explosions
c. To improve electrical conductivity
d. To assist in cleaning PCB spills

A

B

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15
Q

What is the function of the extensive grounding grid system in a substation?
a. To enhance the aesthetics of the substation
b. To provide structural support for equipment
c. To protect personnel from high voltage during fault conditions
d. To facilitate the flow of cooling oil in transformers

A

C

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16
Q

What action should be taken if people are seen climbing over a fence into a substation or inside a substation?
a. Instruct them to touch equipment to discharge static electricity.
b. Ask them to remain calm and move to the fence if safe to do so.
c. Encourage them to explore and understand the substation components.
d. Immediately call the local electrical utility for permission to enter.

A

B

17
Q

What is the recommended approach when responding to a fire in a substation?
a. Enter the substation immediately to assess the situation.
b. Park vehicles and apparatus close to transmission or distribution power lines.
c. Call the electrical utility and resist the temptation to enter the substation.
d. Use metal ladders against the substation fence for quick access.

A

C

18
Q

Why is it important to keep on-lookers well back, a minimum of 100 meters (330 feet), during a substation fire?
a. To avoid interference with emergency responders.
b. Due to the risk of explosion, burning oil, and propelled porcelain pieces.
c. To ensure a clear view for media coverage.
d. Because on-lookers may be at risk of electric shock.

A

B

19
Q

What should be done before entering any substation during an emergency?
a. Call the local electrical utility and request permission.
b. Assess the situation and obtain a copy of the emergency response plan.
c. Enter immediately if there is a risk of explosion.
d. Park vehicles close to the substation for quick access.

A

B

20
Q

What precaution should be taken when fighting substation fires with fire-fighting vehicles?
a. Connect the vehicles to the ground grid or a ground gradient control mat.
b. Use metal ladders against the substation fence for stability.
c. Approach live equipment with caution.
d. Encourage bystanders to help with fire-fighting efforts.

A

A

21
Q

whats your cats name

A

Mr Fuzz

22
Q

What is the recommended distance for using water fog or spray on electrical equipment during a fire in a substation or switchyard?
a. 5 meters (16 feet)
b. 20 meters (66 feet)
c. 30 meters (100 feet)
d. 10 meters (33 feet)

A

D

23
Q

What is the minimum pressure recommended for water spray or fog when fighting a fire inside electrical substations or switchyards?
a. 500 Kpa (72 psi)
b. 600 Kpa (87 psi)
c. 700 Kpa (100 psi)
d. 800 Kpa (116 psi)

A

c

24
Q

Why is the use of water in the form of a straight stream discouraged when fighting fires involving electrical equipment in substations?
a. It can damage adjacent equipment and cause reignition.
b. It is ineffective in suppressing electrical fires.
c. It can create a slippery surface for responders.
d. It may lead to environmental contamination.

A

A

25
Q

What is the minimum recommended distance to keep on-lookers from the site of a fire in a substation or switchyard?
a. 50 meters (165 feet)
b. 75 meters (250 feet)
c. 100 meters (330 feet)
d. 125 meters (410 feet)

A

c

25
Q

What is a major concern when dealing with fires involving combustible insulating oil in substations?
a. Environmental contamination
b. Electrical shock hazards
c. Reinforcement of insulation
d. Rapid combustion of oil

A

a

26
Q

What are some additional difficulties that may be encountered when dealing with privately owned substations in Ontario?
a. Excessive use of warning signs
b. Identification or locating the owner, overgrown property, and poor maintenance
c. Presence of trained electricians on-site
d. Standard maintenance practices

A

B

27
Q

When a privately owned substation needs to be isolated and de-energized, what is the recommended course of action for emergency responders?
a. Enter the substation immediately and assess the situation
b. Contact the utility to disconnect the incoming supply and wait for their arrival
c. Evacuate the surrounding area without notifying the utility
d. Perform basic maintenance tasks to secure the substation

A

B

28
Q

How are electrical utility equipment and storage areas containing PCBs identified?
a. They are painted in bright colors
b. They have large warning signs
c. They emit a distinct odor
d. They are marked with reflective tape

A

B

29
Q

What precautionary measures should be taken by firefighters in the presence of PCBs during a fire situation?
a. Minimize the use of water and avoid alternative agents
b. Prioritize water usage to limit contamination spread
c. Evacuate the area and wait for the utility to handle the situation
d. Ignore the presence of PCBs and proceed with standard firefighting procedures

A

A

30
Q

What is the primary consideration when dealing with contamination caused by PCBs during firefighting operations?
a. Environmental impact
b. Property damage
c. Rapid extinguishing of the fire
d. Public safety

A

D

Electrical Safety Handbook (9 decks)

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