7.4 Capacity Emergencies

Question 1

Which statuses are issued for Capacity Excess emergencies?

Answer 1

Advisories and Alerts only

Question 2

Which statuses are issued for Capacity Shortage emergencies?

Answer 2

Alerts, Warnings, and Actions

no advisories

Question 3

What are the 4 types of Capacity Shortage alerts?

Answer 3

• Unit Startup Notification Alert
• Maximum Generation Emergency Alert
• Primary Reserve Alert
• Voltage Reduction Alert

Question 4

Unit Startup Notification Alert: purpose and trigger?

Answer 4

purpose: to place generating units in readiness to be brought on w/in 48 hours.
trigger: reliability assessment determines long lead time generation needed for a future period

Question 5

Maximum Generation/Load Management Alert: purpose and trigger?

Answer 5

Purpose: Provide early alert that emergency procedures might be required.

Trigger: Operating Reserve Requirement > scheduled Operating Reserve

should be issued 1+ days prior to operating day

Question 6

Primary Reserve Alert: purpose and trigger?

Answer 6

Purpose: to alert of anticipated shortage of operating reserve capacity for future period.

Trigger: When estimated operating reserve < forecasted Primary Reserve Requirement

Question 7

Voltage Reduction Alert: purpose and trigger?

Answer 7

Purpose: to alert members that a voltage reduction action may be required in a future critical period

Trigger: Estimated operating reserve capacity < forecasted synchronous reserve requirement

Question 8

What are the 3 Capacity Emergency Warnings?

Answer 8

• Primary Reserve Warning
• Voltage Reduction Warning & Reduction of Non-Critical Plant Load
• Manual Load Dump Warning

Question 9

Primary Reserve Warning

Answer 9

Issued when Primary Reserve is less than Primary Reserve Requirement and present operations are becoming critical

Trigger: Primary Reserve < Primary Reserve Requirement (150% of largest single contingency), but greater than Synchronized Reserve Requirement (100% of largest single contingency)

Question 10

Voltage Reduction Warning

Answer 10

Warning that Synchronized Reserves are less than required and a voltage reduction may be necessary. \

Trigger: Synchronized Reserves < Synchronized Reserve Requirement (100% of MSSC)

Question 11

Curtailment of Non-Essential Building Load

Answer 11

Purpose: to provide addnl’ relief to be expedited prior to or during a Voltage Reduction Action

Question 12

Manual Load Dump Warning

Answer 12

Purpose: warn of increasingly critical system conditions that may require manually dumping load

Trigger: Primary reserve < largest operating generating unit, or loss of transmission facility jeopardizes reliability after all measures have been taken to increase reserves