NERC TEST 3 QUESTIONS AND ANSWERS A+
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A CPS1 violation is an indication that :
A BA's ACE is hindering frequency .
A BAS ACE is helping frequency
A BA's Frequency Bias is set too high .
A BA is not meeting its L10 .
A BA's ACE is hindering frequency .
A Balancing Authority has a normal generation capacity of approximately 9400
MW and its most severe single contingency is an 800 MW coal fired steam unit .
At 1430 , with an ACE value of 20 MW , a 600 - MW generator trips off line as the
result of a generator differential . This resulted in a large negative ACE for the
Balancing Authority . What value must the ACE return to and in what time frame
to avoid a DCS violation ?
Must return ACE to 20 MW in 15 minutes .
Must return ACE to 0 MW in 10 minutes .
This does not constitute a reportable disturbance .
Must return ACE to 0 MW in 15 minutes .
This does not constitute a reportable disturbance .
The DCS criteria applies to a sudden loss of generation that exceeds 80 % of the
Balancing Authorities most severe single contingency , or in this case 80 % of 800 MWs
which is 640 MWs . Since only 600 MWs were lost , the DCS criteria does not apply .
However , the BA should return ACE as quickly as possible .
Balancing Authority A is currently reading a system frequency of 59.98 Hz . Its
Net Actual Interchange is +100 MW and its Net Scheduled Interchange is +100 MW
. If Balancing Authority A's frequency bias setting is 100 MW / 0.1 HZ , what is
ACE ?
20
-20
0
,2
-20
On problems like this actual do the ace equation
Balancing Authority A is currently reading a system frequency of 59.95 Hz . Its
Net Actual Interchange is +100 MW and its Net Scheduled Interchange is +120 MW
. If Balancing Authority A's frequency bias setting is -100 MW / 0.1 Hz , Balancing
Authority A's AGC is pulsing its generators to ___________
Remain at current MW output level
Increase MW output
Decrease MW output
Increase excitation on the field windings
Take the two portions of the ACE equation separately . 1 ) Frequency is low which
contributes to a negative ACE . 2 ) Actual Interchange is less than scheduled which also
causes negative ACE . Without even calculating the ACE value , it is evident that ACE
will be negative and therefore AGC should be pulsing generators to increase their MW
output
Balancing Authority " A " is importing 225 MWs , and is only scheduled to import
200 MWs . The BA's Bias Setting is 200 MWS / .1 Hz and frequency is 59.99 Hz .
What does ACE indicate ?
45 MW over - generating
20 MW over - generating
20 MW under - generating
45 MW under generating
45 MW under generating
Plug into the ace equation!
A Balancing Authority's inadvertent accumulation reflects over - generation
during on peak hours . When system load is decreasing , what actions could a
Balancing Authority system operator take to limit additional on peak inadvertent
accumulation
1. Decrease transactions into their system
2. Increase transactions into their system
3. Decrease generation
4. Increase generation
02 and 3
, 01 and 4
2 and 4
1 and 3
1 and 3
The Frequency Response Measure ( FRM ) of a Balancing Authority is determined
by using actual data from past frequency events . What provides Interconnection
Frequency support ?
All generators in North America will increase generation according to their size .
All generators ' automatic generation control response to ACE .
Generator governor response within the Interconnection resulting in an increase
of generation .
Each generator has a fixed amount of support to provide regardless of status and
size .
Generator governor response within the Interconnection resulting in an increase of
generation .
At the end of the business day , two adjacent Balancing Authorities must agree
with which of the below actual operating values regarding Inadvertent
Interchange ?
1. The hourly integrated values of Net Interchange Schedule .
2. The hourly values of each Interchange Transaction .
3. The hourly integrated megawatt values of individual interconnecting the lines .
4. The hourly integrated values of Net Actual Interchange .
1 , 2 , 3 and 4
1 and 4
2 and 3
2 and 4
1 and 4
Which of the following are true about system frequency ?
lt is related to the speed of the generators tied to the system .
lt is an indication of generation to load demand balance .
It is measured in Hertz .
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A CPS1 violation is an indication that :
A BA's ACE is hindering frequency .
A BAS ACE is helping frequency
A BA's Frequency Bias is set too high .
A BA is not meeting its L10 .
A BA's ACE is hindering frequency .
A Balancing Authority has a normal generation capacity of approximately 9400
MW and its most severe single contingency is an 800 MW coal fired steam unit .
At 1430 , with an ACE value of 20 MW , a 600 - MW generator trips off line as the
result of a generator differential . This resulted in a large negative ACE for the
Balancing Authority . What value must the ACE return to and in what time frame
to avoid a DCS violation ?
Must return ACE to 20 MW in 15 minutes .
Must return ACE to 0 MW in 10 minutes .
This does not constitute a reportable disturbance .
Must return ACE to 0 MW in 15 minutes .
This does not constitute a reportable disturbance .
The DCS criteria applies to a sudden loss of generation that exceeds 80 % of the
Balancing Authorities most severe single contingency , or in this case 80 % of 800 MWs
which is 640 MWs . Since only 600 MWs were lost , the DCS criteria does not apply .
However , the BA should return ACE as quickly as possible .
Balancing Authority A is currently reading a system frequency of 59.98 Hz . Its
Net Actual Interchange is +100 MW and its Net Scheduled Interchange is +100 MW
. If Balancing Authority A's frequency bias setting is 100 MW / 0.1 HZ , what is
ACE ?
20
-20
0
,2
-20
On problems like this actual do the ace equation
Balancing Authority A is currently reading a system frequency of 59.95 Hz . Its
Net Actual Interchange is +100 MW and its Net Scheduled Interchange is +120 MW
. If Balancing Authority A's frequency bias setting is -100 MW / 0.1 Hz , Balancing
Authority A's AGC is pulsing its generators to ___________
Remain at current MW output level
Increase MW output
Decrease MW output
Increase excitation on the field windings
Take the two portions of the ACE equation separately . 1 ) Frequency is low which
contributes to a negative ACE . 2 ) Actual Interchange is less than scheduled which also
causes negative ACE . Without even calculating the ACE value , it is evident that ACE
will be negative and therefore AGC should be pulsing generators to increase their MW
output
Balancing Authority " A " is importing 225 MWs , and is only scheduled to import
200 MWs . The BA's Bias Setting is 200 MWS / .1 Hz and frequency is 59.99 Hz .
What does ACE indicate ?
45 MW over - generating
20 MW over - generating
20 MW under - generating
45 MW under generating
45 MW under generating
Plug into the ace equation!
A Balancing Authority's inadvertent accumulation reflects over - generation
during on peak hours . When system load is decreasing , what actions could a
Balancing Authority system operator take to limit additional on peak inadvertent
accumulation
1. Decrease transactions into their system
2. Increase transactions into their system
3. Decrease generation
4. Increase generation
02 and 3
, 01 and 4
2 and 4
1 and 3
1 and 3
The Frequency Response Measure ( FRM ) of a Balancing Authority is determined
by using actual data from past frequency events . What provides Interconnection
Frequency support ?
All generators in North America will increase generation according to their size .
All generators ' automatic generation control response to ACE .
Generator governor response within the Interconnection resulting in an increase
of generation .
Each generator has a fixed amount of support to provide regardless of status and
size .
Generator governor response within the Interconnection resulting in an increase of
generation .
At the end of the business day , two adjacent Balancing Authorities must agree
with which of the below actual operating values regarding Inadvertent
Interchange ?
1. The hourly integrated values of Net Interchange Schedule .
2. The hourly values of each Interchange Transaction .
3. The hourly integrated megawatt values of individual interconnecting the lines .
4. The hourly integrated values of Net Actual Interchange .
1 , 2 , 3 and 4
1 and 4
2 and 3
2 and 4
1 and 4
Which of the following are true about system frequency ?
lt is related to the speed of the generators tied to the system .
lt is an indication of generation to load demand balance .
It is measured in Hertz .
