Exam (elaborations)
PJM Exam Questions And 100% Accurate Answers
- Course
- Institution
PJM Exam Questions And 100% Accurate Answers...
[Show more]
Content preview
PJM Exam Questions And 100% Accurate AnswersLeading phase when current is. - ANSWER Capacitive
What is the pass mark for a unit regulation test? - ANSWER 75% compliance with the test
signal
What resource generation is available in less than 10 minutes for offline reserves? -
ANSWER Quick-start
How does PJM avoid dealing with economic issues during transmission related
operational constraints? - ANSWER Cost (offer) capping generation
Which balance control mode does PJM use for normal operations? ANSWER Tie-line
bias
Three modes of control available to PJM dispatcher ACE control modes ANSWER Flat
Frequency Control, Flat Tie Line Control, Tie Line Bias Control
What is Flat Frequency Control? - ANSWER Uses only power system frequency as the
controlling parameter; responds only to frequency deviations; applies only when PJM
balancing area is islanded from the Eastern Interconnection
What is flat tie line control? - ANSWER Utilizes only interconnection tie line flow as the
controlling parameter; only responds to net tie flow deviations & does not adjust
operation for any frequency deviations; limited to special circumstances
What is tie line bias control? - ANSWER most widely used mode of control for
multi-balancing area power systems; responds to both frequency & net tie line flow
deviations
,To lower system voltage, MVAR must be shed in which direction to lower MW? -
ANSWER Decrease MVAR
What percent of regulation does PJM require for a system restoration? - ANSWER 2% of
current load
At what frequency will a system blackout? - ANSWER 57.5 Hz or lower
What minimum threshold is considered to be part of the BES? - ANSWER 100 kV or
greater
What is the Bulk Electric System (BES)? - ANSWER The electrical generation resources,
transmission lines, interconnections with neighboring systems, & associated equipment
generally operated at voltages 100 kV or higher
What are the limits that must be submitted to PJM for generating units? - ANSWER Eco
min, Eco max, Emergency Max
During high geomagnetic activity (>10 amperes at Missouri Ave or Meadowbrook
facility) what must be immediately implemented? - ANSWER Conservative operation
Other triggers that would call for conservative operations? - ANSWER fuel delivery
problems, forest/brush fires, environmental alerts, bad weather, terrorist or sabotage
threats against the BES, actual attacks against critical assets, PJM entering an
"unknown operating state"
What is conservative operations? - ANSWER PJM should implement additional actions
under specific events, conditions, or circumstances that could threaten the reliability of
the BES
What problems usually occur during minimum generation conditions? - ANSWER Excess
,generation online & high voltage
A unit is cost capped - WHEN During transmission related constraints
What is cost capping? - ANSWER Principles used by PJM when considering cost
containment provisions; all offers (cost & price) capped at $1,000/MWh by default and
offers over will need verification
If SCADA and ICCP go down, where should data be updated? - ANSWER EMS (Energy
Management System)
How often is reactive testing completed? - ANSWER Every 5 years
What mechanical device controls deviations in voltage? - ANSWER Load tap changer
For a generator unable to maintain its voltage schedule, who can approve a
replacement schedule? - ANSWER Transmission Owner
Under PJM's consideration, using what two elements for load forecasting? - ANSWER
Weather & day of the week
During system restoration, a generator should not be loaded above what level? -
ANSWER Dynamic Reserve
What is the dynamic reserve? - ANSWER the amount of reserve available to preserve the
system during a frequency disturbance; comprised of reserve on generators & load with
underfrequency relaying
What unit is allowed to set LMP? - ANSWER A unit that is dispatched for constraint
control
, At what fuel limit must PJM be notified for a black start unit? - ANSWER 10 hours
What is a black start unit? - ANSWER Generating units that are able to start without an
outside electrical supply or a unit with high operating factor to remain operating at
reduced levels when automatically disconnected from the grid
Why are black start units needed? - ANSWER necessary to restore the PJM transmission
system following a blackout; designate specific generators whose location &
capabilities are required to re-energize the system
Where does MET (meteorological) tower are used? - ANSWER Wind farms
Which generators must go through ICAP (installed capacity) testing? - ANSWER All
except wind & solar generators
What is ICAP (installed capacity)? - ANSWER The summer net capability of a generating
unit
What allows a circuit breaker between two control areas to be manually closed? -
ANSWER Synchroscope - shows the extent to which two systems are in sync with each
other
What does PJM monitor for three types of transmission constraints? - ANSWER
Reactive, Stability, Thermal (transfer limits)
To lower system voltage, it is necessary to reduce --- in order to reduce --- - ANSWER
MW, MVAR
The winter load shape in PJM has two peaks, true/false? - ANSWER TRUE
When corrections are made for the time error and the system schedule frequency must
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76800 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now