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Oroville > Oroville Complex > Flashcards

Oroville Complex Flashcards

1
Q

Hyatt PP, Diversion Dam PP, and Thermalito PP are operated together to:

A

maintain the water levels in the diversion dam pool, and Thermalito forebay.

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2
Q

What percentage of the complex load is on Thermalito to balance water between the plants?

A

10-12%. This percentage will vary with the head across Thermalito and Lake Oroville elevation.

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3
Q

Normal operating level for the diversion dam is:

A

224-225 feet (the minimum submergence on the Hyatt units is 220 feet)

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4
Q

The maximum elevation of the diversion dam is:

A

226 feet, which is the top of the diversion dam spillgates

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5
Q

Normal operating level for Thermalito forebay is:

A

222-224 feet

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6
Q

The minimum elevation of Thermalito forebay to prevent vortexing of the Thermalito units at full load is:

A

220 feet

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7
Q

At low complex loads, the water will be almost flat, and at high complex loads there will be as much as _____ feet of drop form the diversion dam to the Thermalito forebay. Most of the drop occurs:

A

across the Power Canal Headworks gates.

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8
Q

There is about _____ AF of usable storage between elevation ___ - ___ feet in the Diversion Pool and Thermalito Forebay.

A

5,000

220 - 225

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9
Q

When the complex is at full load, the usable storage at the Diversion pool and Thermalito Forebay is reduced to:

A

1,000 AF

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10
Q

Complex maximum capacity is ___ MW at Table Mountain Sub.

A

925

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11
Q

There is approximately ___ % loss transmitting power from OFD to Table Mountain Sub.

A

one

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12
Q

Hyatt units are block loaded to avoid:

A

rough areas
and
areas of high thrust bearing loading

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13
Q

Hyatt units are more efficient:

A

at high loads

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14
Q

Which Hyatt units are primarily used for regulation when on ISO AGC signal?

A

2, 4, 6

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15
Q

Hyatt units 1, 3, and 5 can be used for regulation depending on:

A

complex load
and
number of available units

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16
Q

Hyatt PP maximum loading rate is ___ MW per minute with no limit on unloading the units.

A

100

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17
Q

The maximum Hyatt PP loading rate is due to a restriction of the:

A

tailrace

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18
Q

Which Thermalito units can be block loaded:

A

2, 3, 4

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19
Q

Which Hyatt units can be block loaded?

A

1, 3, 5

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20
Q

Thermalito units are block loaded to avoid:

A

rough areas
and
maintain maximum efficiency

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21
Q

Best efficiency for Thermalito units is:

A

60% - 80% wicket gate opening.

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22
Q

The rough zone for Thermalito units is between:

A

10 - 22 MW.

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23
Q

Due to cooling of the turbine guide bearings of the Thermalito units, loads below __ MW should be avoided.

A

10

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24
Q

Thermalito unit ___ is used for regulation when on ISO AGC (Independent Signal Operator, Automatic Generation Control) signal.

A

one

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25
Q

The power factor on the lines at Oroville and Thermalito switchyards should be maintained at:

A

unity

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26
Q

At full load at Hyatt, unity requires:

A

15 -20 MV of boost

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27
Q

PG&E can request voltage support. These requests can come from:

A

PG&E dispatcher
or
Table Mountain Sub. Operator

28
Q

Hyatt unit flows for pumping will vary from:

A

1,100 CFS at lake elevation 900 feet
to
2,400 CFS at lake elevation 730 feet

29
Q

To maintain maximum pumping efficiency at Hyatt, wicket gate positions will vary according to:

A

lake elevations

30
Q

Hyatt pumps must be unloaded prior to:

A

separation and shutdown

31
Q

Thermalito pumping flows vary from:

A

3,000 - 3,400 CFS

32
Q

Thermalito pumping flows are affected by:

A

afterbay and forebay elevations

33
Q

For pumping, Thermalito wicket gate position is set in the governor for:

A

maximum pumping efficiency

34
Q

Although Hyatt units can be cycled on/off for water level control in the diversion pool and Thermalito forebay, it is better to:

A

cycle the Thermalito units due to the complexity of starting a Hyatt unit.

35
Q

When the Thermalito units are shutdown during pumping, the wicket gates will:

A

close automatically prior to the unit breaker opening.

36
Q

For pumping, Thermalito units are started:

A

across the line

37
Q

For pumping, Hyatt units are started:

A

by in-house generators and then paralleled to the line (reduced frequency / reduced voltage starts)

38
Q

Thermalito Diversion Dam Power Plant (TDP) is operated as:

A

base load power plant

39
Q

TDP supplies power to:

A

Fish Hatchery
and
Oroville Switchyard

40
Q

TDP is used to maintain the FERC required minimum water release to:

A

low flow section of the Feather River

41
Q

Minimum release to the Feather River required by FERC is:

A

600 CFS

42
Q

OFD maintains a ___ CFS release to the Feather River to ensure minimum release requirements to avoid fines.

A

620

43
Q

The TDP governor maintains a MW setpoint. If the Diversion Pool elevation changes:

A

the flow on the unit will change

44
Q

TDP flow limits are set on SCADA at:

A

10 CFS above and below the required flow

45
Q

If the Fish Hatchery makes a flow change, the operator:

A

must enter new limits into SCADA

46
Q

The River Outlet at Thermalito Afterbay is operated:

A

year round

47
Q

The irrigation turnouts at Thermalito Afterbay are operated:

A

from April through mid January and are shutdown the rest of the year

48
Q

The River Outlet at Thermalito Afterbay is used to:

A

maintain minimum flows to the Feather River
and
flood control

49
Q

Water contractors may sometimes call with very short notice when:

A

they require flow changes at irrigation turnouts

50
Q

Thermolito Afterbay has howmany turnouts?

A

five

51
Q

When Western Canal flows are above ___ CFS, we must maintain at least ___ feet of head across the site.

A

600

two

52
Q

If the water level of the Thermolito Afterbay is changing rapidly:

A

the control system can’t keep up to maintain the flow.

53
Q

At Thermolito Afterbay, all outlet flow and level limits must be:

A

maintained to ensure the proper flow is being released
and
must be checked after a release change is made

54
Q

At the Thermolito Afterbay turnouts, the maximum deviation in flow on a site is _____ %. If the flow deviates greater than _____ %, notify the appropriate water agency.

A

five

55
Q

It requires at least ____ hours notice prior to making flood control releases above the capacity of the Plants. This gives us time to set-up the spill gates at the Spillway and Diversion Dam.

A

four

56
Q

Water Tech must make notifications for flood control releases above:

A

20,000 CFS

57
Q

Prior to making initial releases from the Spillway and the Diversion Dam, Water Tech must set up those sites, i.e.:

A

close the 480V breakers
zero out the gate position indicators
test the SEG
etc.

58
Q

A Water Tech must observe the spill gates for:

A

initial opening
and
when the gates are being fully closed

59
Q

Flood control release form Lake Oroville is the combined flow of Hyatt and the Spillway. If the load is changed on the Plant:

A

the spillway release must be adjusted to maintain the required release.

60
Q

When flood releases are being made from Lake Oroville:

A

there is a minimal amount of useable storage in the Diversion Dam

61
Q

During flood release from Lake Oroville, Hyatt plant flow must be reduced when tailrace elevation reaches:

A

226.5 feet

62
Q

During flood release from Lake Oroville, Hyatt plant must be shutdown when tailrace elevation reaches:

A

236 feet

63
Q

Spill Gates at the Spillway and Diversion Dam must be operated with a maximum of:

A

two feet difference between adjacent gate openings

64
Q

At the Spillway, a meter reading of three feet opening of the spill gates represents:

A

a two feet vertical opening of the spill gates

65
Q

The Diversion Dam spill gates meter vertical opening:

A

accurately

66
Q

The total flood release to the Feather River is the combined release of:

A

Diversion Dam
and
River Outlet

Oroville (11 decks)

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