LADWP Electric Station Operator (Circuit
Breakers, Disconnects, Transformers)
Questions and Answers Latest Versions
__________ switching performed by Operators in usually in
response to power outages and abnormal conditions such as
overloads.
Emergency
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-energization.
manipulation
__________ 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.
Circuit breakers
Transformers and voltage regulators must be energized and
de-energized using __________.
Circuit breakers
__________ are designed to open, close, energize, de-
energize, and interrupt normal and abnormal values of
current flow in electrical circuits
Circuit breakers
__________ are provided as a method of visually confirming
that a circuit has been "disconnected" from specified
sources of electrical energy.
Disconnects
__________ are used to energize or de-energize short
sections of conductor such as leads connecting a circuit
breaker to its associated disconnects.
, Disconnects
__________ are not designed to interrupts current flow, open
or close circuits, or energize and de-energize circuits other
than short sections.
Disconnects
During abnormal conditions, current often exceeds the
normal limitation of these devices by as much as _____ to
_____ times their normal rating.
10 20
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.
Dielectric medium
The ability of a substance to prevent the flow of electrical
current is described as its __________ strength.
Dielectric
__________ of electricity have no dielectric strength, as they
allow current to flow in a circuit.
Conductors
__________, 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.
Air
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.
Circuit Breakers
___________ and moisture in particular are two elements that
can destroy the interrupting capabilities of a chosen
dielectric medium.
Dirt
Breakers, Disconnects, Transformers)
Questions and Answers Latest Versions
__________ switching performed by Operators in usually in
response to power outages and abnormal conditions such as
overloads.
Emergency
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-energization.
manipulation
__________ 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.
Circuit breakers
Transformers and voltage regulators must be energized and
de-energized using __________.
Circuit breakers
__________ are designed to open, close, energize, de-
energize, and interrupt normal and abnormal values of
current flow in electrical circuits
Circuit breakers
__________ are provided as a method of visually confirming
that a circuit has been "disconnected" from specified
sources of electrical energy.
Disconnects
__________ are used to energize or de-energize short
sections of conductor such as leads connecting a circuit
breaker to its associated disconnects.
, Disconnects
__________ are not designed to interrupts current flow, open
or close circuits, or energize and de-energize circuits other
than short sections.
Disconnects
During abnormal conditions, current often exceeds the
normal limitation of these devices by as much as _____ to
_____ times their normal rating.
10 20
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.
Dielectric medium
The ability of a substance to prevent the flow of electrical
current is described as its __________ strength.
Dielectric
__________ of electricity have no dielectric strength, as they
allow current to flow in a circuit.
Conductors
__________, 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.
Air
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.
Circuit Breakers
___________ and moisture in particular are two elements that
can destroy the interrupting capabilities of a chosen
dielectric medium.
Dirt
