Grounding/Ground Grids Flashcards

1
Q

A low-resistance, well-designed, and well-constructed ground grid is necessary to provide improved ? .

A

worker safety

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2
Q

One reason a well-grounded substation neutral provides improved power quality is because ? need a solid ground reference to properly operate switchgear.

A

control relays

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3
Q

The substation ground grid protects workers and the public from ? and ? potentials.

A

touch / step

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4
Q

If a person’s body is bridging across an open point in a ground grid during a system fault, the person can receive a fatal shock.

A

True

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5
Q

The design of a substation ground grid starts with choosing a site location where ? is present, which has the ability to dissipate power surges.

A

good earth

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6
Q

In a substation, the ground grid covers ? .

A

the entire area of the substation

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7
Q

If multiple ground rods driven eight feet deep do not provide a low enough resistance to meet specifications, ? in order to achieve lower resistance.

A

a second rod can be joined to the first to go deeper

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8
Q

If a ground grid needs lower resistivity, deep-drilled wells back-filled with ? can be used.

A

a highly conductive clay such as bentonite

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9
Q

A substation ground grid is not subjected to a high electrical current.

A

False

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10
Q

Electrical connections on a ground grid need to be fail-safe, so that when there is a rise in potential on the total grounding network in the station, everything will remain bonded together.

A

True

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11
Q

The type of below-grade connector typically used on a substation grid is a(n) ? connection.

A

exothermic welded

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12
Q

Training is required on how to properly install exothermic connectors.

A

True

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13
Q

Crushed stone is a good product to cover a substation ground grid because it offers some protection when stepping from the grid to a ? .

A

remote ground

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14
Q

Electrical connections are made at all crossover junctions of the grid.

A

True

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15
Q

Electrical connections are made at all crossover junctions of the grid.

A

touch and step potentials

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16
Q

Workers are protected from touch potentials in a substation because metal equipment such as transformers, switchgear, cable trays, and fences, are all connected to the ground grid.

A

true

17
Q

Workers are protected from ? because the design and spacing of the substation ground grid does not place one foot of a worker at a different potential from the other foot.

A

step potentials

18
Q

The public is protected from touch potentials because the fence is bonded to the ground grid, and the grid extends outside of the fence.

A

true