LADWP Electric Station Operator (Circuit Breakers, Disconnects, Transfo
ers)
Study online at https://quizlet.com/_hprqu5
1. switching: One of the primary tasks of the Electric Station Operator is the __________ of high voltage circuits.
2. 50 100: Electrical current may flow across the contacts of ____ to ____ electrical switches before it reaches the
consumer.
3. improper: The __________ operation of these electrical switches can pose a serious hazard to personnel, can
cause destruction of expensive power system equipment, and can cause unnecessary interruption of electrical service
to consumers.
4. switches: Electrical __________ are installed in the path from the generator to the consumer to provide
reliability, flexibility, and safeguards for the electrical power system.
5. emergency: Operators use electrical switches to perform routine, automatic, and ____________ switching
operations on the electrical system.
6. Routine: ___________ switching is for maintenance, construction, cleaning, testing, etc.
7. Automatic: ___________ switching operations include automatic reclosers (ARs), Voltage Pickup Unit (VPUs),
and Automatic Transfer Switching (ATSs).
8. Emergency: ___________ switching operations include insolate trouble, restoration, 4.8kV Ground Search,
etc.
9. Automatic: The placement of ___________ electrical switches in the power system makes it possible to limit
both the duration and the extent of power outages.
10. Emergency: __________ switching performed by Operators in usually in response to power outages and
abnormal conditions such as overloads.
11. manipulation: The electrical function of switches falls into two categories; ___________ of relatively high
values of current and voltage under load AND the switching of circuits to provide a visual confirmation of de-energiza-
tion.
12. Circuit breakers: __________ are electrical switches that are used to manipulate high values of current and
voltage in circuits that are carrying current or will be carrying current following the operation.
13. Circuit breakers: Transformers and voltage regulators must be energized and de-energized using
__________.
14. Circuit breakers: __________ are designed to open, close, energize, de-energize, and interrupt normal
and abnormal values of current flow in electrical circuits
15. Disconnects: __________ are provided as a method of visually confirming that a circuit has been "discon-
nected" from specified sources of electrical energy.
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, LADWP Electric Station Operator (Circuit Breakers, Disconnects, Transfo
ers)
Study online at https://quizlet.com/_hprqu5
16. Disconnects: __________ are used to energize or de-energize short sections of conductor such as leads
connecting a circuit breaker to its associated disconnects.
17. Disconnects: __________ are not designed to interrupts current flow, open or close circuits, or energize and
de-energize circuits other than short sections.
18. 10 20: During abnormal conditions, current often exceeds the normal limitation of these devices by as much as
_____ to _____ times their normal rating.
19. Dielectric medium: This is the insulating mechanism that occupies the space between the open contacts
of a CB and prevents the flow of current through the device while the contacts are in the open position.
20. Dielectric: The ability of a substance to prevent the flow of electrical current is described as its __________
strength.
21. Conductors: __________ of electricity have no dielectric strength, as they allow current to flow in a circuit.
22. Air: __________, which has a relatively high dielectric strength, is used as the dielectric medium in many low
voltage applications where current values are also low. A common example is the light switch found in homes, etc.
23. Circuit Breakers: Some of the materials used in __________that have sufficient dielectric strength of for
interrupting power system current values are: Insulating oils, pressurized inert gasses, Sulfur Hexafluoride gas, and
Vacuum chambers.
24. Dirt: ___________ and moisture in particular are two elements that can destroy the interrupting capabilities of
a chosen dielectric medium.
25. explode: Severe contamination of a dielectric medium can cause CBs to __________ by allowing an arc to be
sustained between the open contacts or the contacts and the grounded tank(s) or housing of the CB.
26. Bushings: __________ are usually made of insulating porcelain.
27. Nonconductive: Portions of the mechanical linkages connected to movable contacts must be constructed
of __________ materials to prevent the electrical components of the contacts and conductors from energizing the
components of the CB such as the tank, controls, etc.
28. 0.2: The operating time, from fully open to fully closed, in many large CBs, is often less than __________ seconds.
29. linkage: Failure of the mechanical __________ (sometimes referred to as the actuating arm or lever) can cause
serious damage to the circuit breaker or may cause normally non-energized portions of the CB to become energized.
30. Control: __________ circuits use auxiliary devices that direct the operation of the CB.
31. Semaphore: The mechanical indicator used at the CB to indicate the status of the breaker is called the
___________.
32. Disconnects: __________ must never be used to interrupt current flow in circuit.
2/7
ers)
Study online at https://quizlet.com/_hprqu5
1. switching: One of the primary tasks of the Electric Station Operator is the __________ of high voltage circuits.
2. 50 100: Electrical current may flow across the contacts of ____ to ____ electrical switches before it reaches the
consumer.
3. improper: The __________ operation of these electrical switches can pose a serious hazard to personnel, can
cause destruction of expensive power system equipment, and can cause unnecessary interruption of electrical service
to consumers.
4. switches: Electrical __________ are installed in the path from the generator to the consumer to provide
reliability, flexibility, and safeguards for the electrical power system.
5. emergency: Operators use electrical switches to perform routine, automatic, and ____________ switching
operations on the electrical system.
6. Routine: ___________ switching is for maintenance, construction, cleaning, testing, etc.
7. Automatic: ___________ switching operations include automatic reclosers (ARs), Voltage Pickup Unit (VPUs),
and Automatic Transfer Switching (ATSs).
8. Emergency: ___________ switching operations include insolate trouble, restoration, 4.8kV Ground Search,
etc.
9. Automatic: The placement of ___________ electrical switches in the power system makes it possible to limit
both the duration and the extent of power outages.
10. Emergency: __________ switching performed by Operators in usually in response to power outages and
abnormal conditions such as overloads.
11. manipulation: The electrical function of switches falls into two categories; ___________ of relatively high
values of current and voltage under load AND the switching of circuits to provide a visual confirmation of de-energiza-
tion.
12. Circuit breakers: __________ are electrical switches that are used to manipulate high values of current and
voltage in circuits that are carrying current or will be carrying current following the operation.
13. Circuit breakers: Transformers and voltage regulators must be energized and de-energized using
__________.
14. Circuit breakers: __________ are designed to open, close, energize, de-energize, and interrupt normal
and abnormal values of current flow in electrical circuits
15. Disconnects: __________ are provided as a method of visually confirming that a circuit has been "discon-
nected" from specified sources of electrical energy.
1/7
, LADWP Electric Station Operator (Circuit Breakers, Disconnects, Transfo
ers)
Study online at https://quizlet.com/_hprqu5
16. Disconnects: __________ are used to energize or de-energize short sections of conductor such as leads
connecting a circuit breaker to its associated disconnects.
17. Disconnects: __________ are not designed to interrupts current flow, open or close circuits, or energize and
de-energize circuits other than short sections.
18. 10 20: During abnormal conditions, current often exceeds the normal limitation of these devices by as much as
_____ to _____ times their normal rating.
19. Dielectric medium: This is the insulating mechanism that occupies the space between the open contacts
of a CB and prevents the flow of current through the device while the contacts are in the open position.
20. Dielectric: The ability of a substance to prevent the flow of electrical current is described as its __________
strength.
21. Conductors: __________ of electricity have no dielectric strength, as they allow current to flow in a circuit.
22. Air: __________, which has a relatively high dielectric strength, is used as the dielectric medium in many low
voltage applications where current values are also low. A common example is the light switch found in homes, etc.
23. Circuit Breakers: Some of the materials used in __________that have sufficient dielectric strength of for
interrupting power system current values are: Insulating oils, pressurized inert gasses, Sulfur Hexafluoride gas, and
Vacuum chambers.
24. Dirt: ___________ and moisture in particular are two elements that can destroy the interrupting capabilities of
a chosen dielectric medium.
25. explode: Severe contamination of a dielectric medium can cause CBs to __________ by allowing an arc to be
sustained between the open contacts or the contacts and the grounded tank(s) or housing of the CB.
26. Bushings: __________ are usually made of insulating porcelain.
27. Nonconductive: Portions of the mechanical linkages connected to movable contacts must be constructed
of __________ materials to prevent the electrical components of the contacts and conductors from energizing the
components of the CB such as the tank, controls, etc.
28. 0.2: The operating time, from fully open to fully closed, in many large CBs, is often less than __________ seconds.
29. linkage: Failure of the mechanical __________ (sometimes referred to as the actuating arm or lever) can cause
serious damage to the circuit breaker or may cause normally non-energized portions of the CB to become energized.
30. Control: __________ circuits use auxiliary devices that direct the operation of the CB.
31. Semaphore: The mechanical indicator used at the CB to indicate the status of the breaker is called the
___________.
32. Disconnects: __________ must never be used to interrupt current flow in circuit.
2/7
