NERC Qs & Answer key
D. Regional Reliability Organization for the area.
A misoperation occurred
when an overhead ground
wire on a 230KV
transmission line between
two substations broke and
fell across A phase of the
line. One of the line circuit
breakers failed to open
causing the breaker failure
relay to pick up and as a
result tripped the entire
substation bus off line that
the failed circuit breaker
was feeding off of. Who is
charged with the
responsibility to develop
procedures to ensure
misoperations are
reviewed and analyzed to
determine proper
mitigation plans?
C. Neighboring Transmission Operators, Balancing
authorities, and Generator Operators.
The transmission operator
that you work for is
installing new relays on
some of their major
transmission tie lines
using newer technology.
Who should your
company notify before
work is begun?
A. Annually
When shall the
transmission Operators
and balancing authorities
review and update
emergency plans?
, NERC Qs & Answer key
Expected average MW profile for each hour.
When the responsible
entity tags a dynamic
schedule, what values
should it use for the
energy profile?
D. Issue a TLR on enough interchange transactions
starting with the lowest priority and working up, until
enough are curtailed to relieve the transformer from
its overload condition.
You are reliability
coordinator in the eastern
interconnection.
Transmission Operator AB
is in your Reliability Area.
Transmission Operator AB
reports that a 600 MW
generator that tripped
offline has caused an
overload of a
345/138/13KV Inter-tie
Transformer Bank. You
realize that if the
overloaded transformer
trips off line, it would
create an IROL. There are
several Interchange
Transactions that have
parallel flows that are
flowing through that
transformer. What should
you do?
B. A Reliability Coordinator or transmission operator
makes the determination and must notify the
Which entities may purchasing-selling entity.
determine the deviation of
a dynamic schedule
constitutes a Reliability
concern? Also, what entity
must notify of that
determination and the
reason for the
determination?
, NERC Qs & Answer key
A. Balancing Authority
Which entity would make
the original request for an
EEA event?
B. CPS 2
At 0620 local time,
interconnection frequency
is 60.025 Hz. Balancing
Authority A's ACE at that
time is -100MW and it's
L10 value is 50MW. By
0625, it's ACE has
changed to -25MW and
the frequency has
decreased to 60.012 Hz.
By 0630, A's ACE is -5MW
and frequency is 60.001
Hz. For the 10 minute
period, balancing authority
A's average ACE was
55MW. What control
performance standard has
the BA violated(if any)?
C.Power flow simulation
The daily plan is usually
generated using unit
committee and
__________ software.
, NERC Qs & Answer key
A. Curtail load.
A severe lightning storm
has hit your transmission
system. Two 345KV lines
have been damaged and
are unable to be
reenergized. Two large
generators of 500MW and
700MW have tripped off
line. No additional
generators are available
to bring on line. The
parallel 230KV and 138KV
lines are loaded at their
emergency limits. As a
system operator, what
should you do?
B. Passed. With 91.7%
At the end of September,
Balancing Authority C had
CPS2 violations. Did
Balancing Authority C
pass or fail their CPS2
requirements for the
month? What was their
final CPS2 percentage
score for the month of
September?
A. three
Transmission Operators
frequently use distance
relays to protect their
transmission lines. These
distance relay schemes
quite often use ____
zones of protection.
D. Regional Reliability Organization for the area.
A misoperation occurred
when an overhead ground
wire on a 230KV
transmission line between
two substations broke and
fell across A phase of the
line. One of the line circuit
breakers failed to open
causing the breaker failure
relay to pick up and as a
result tripped the entire
substation bus off line that
the failed circuit breaker
was feeding off of. Who is
charged with the
responsibility to develop
procedures to ensure
misoperations are
reviewed and analyzed to
determine proper
mitigation plans?
C. Neighboring Transmission Operators, Balancing
authorities, and Generator Operators.
The transmission operator
that you work for is
installing new relays on
some of their major
transmission tie lines
using newer technology.
Who should your
company notify before
work is begun?
A. Annually
When shall the
transmission Operators
and balancing authorities
review and update
emergency plans?
, NERC Qs & Answer key
Expected average MW profile for each hour.
When the responsible
entity tags a dynamic
schedule, what values
should it use for the
energy profile?
D. Issue a TLR on enough interchange transactions
starting with the lowest priority and working up, until
enough are curtailed to relieve the transformer from
its overload condition.
You are reliability
coordinator in the eastern
interconnection.
Transmission Operator AB
is in your Reliability Area.
Transmission Operator AB
reports that a 600 MW
generator that tripped
offline has caused an
overload of a
345/138/13KV Inter-tie
Transformer Bank. You
realize that if the
overloaded transformer
trips off line, it would
create an IROL. There are
several Interchange
Transactions that have
parallel flows that are
flowing through that
transformer. What should
you do?
B. A Reliability Coordinator or transmission operator
makes the determination and must notify the
Which entities may purchasing-selling entity.
determine the deviation of
a dynamic schedule
constitutes a Reliability
concern? Also, what entity
must notify of that
determination and the
reason for the
determination?
, NERC Qs & Answer key
A. Balancing Authority
Which entity would make
the original request for an
EEA event?
B. CPS 2
At 0620 local time,
interconnection frequency
is 60.025 Hz. Balancing
Authority A's ACE at that
time is -100MW and it's
L10 value is 50MW. By
0625, it's ACE has
changed to -25MW and
the frequency has
decreased to 60.012 Hz.
By 0630, A's ACE is -5MW
and frequency is 60.001
Hz. For the 10 minute
period, balancing authority
A's average ACE was
55MW. What control
performance standard has
the BA violated(if any)?
C.Power flow simulation
The daily plan is usually
generated using unit
committee and
__________ software.
, NERC Qs & Answer key
A. Curtail load.
A severe lightning storm
has hit your transmission
system. Two 345KV lines
have been damaged and
are unable to be
reenergized. Two large
generators of 500MW and
700MW have tripped off
line. No additional
generators are available
to bring on line. The
parallel 230KV and 138KV
lines are loaded at their
emergency limits. As a
system operator, what
should you do?
B. Passed. With 91.7%
At the end of September,
Balancing Authority C had
CPS2 violations. Did
Balancing Authority C
pass or fail their CPS2
requirements for the
month? What was their
final CPS2 percentage
score for the month of
September?
A. three
Transmission Operators
frequently use distance
relays to protect their
transmission lines. These
distance relay schemes
quite often use ____
zones of protection.
