Nerc test stuvia Study guides, Class notes & Summaries

1. If a 500 kV transmission line with a surge impedance loading of 800 MW is currently loaded at 1400 MW, which of the following events would most likely occur? a. Generator MVAR output would increase b. All system capacitors would trip off-line c. Generator MVAR output would decrease d. All automatic reactors would connect to the system - Answer a. Generator MVAR output would increase 2. When system conditions are such that emergency procedures are expected to be implemented, which of ...

b. NERC Operating Committee - Answer What group can approve a change in the Disturbance Recovery Period for an Interconnection? a. NERC Interconnection Working Group b. NERC Operating Committee c. NERC Regional Council d. NERC Disturbance Analysis Working Group c. Check targets and equipment - Answer What is the first thing an operator should do after a relay operation? a. Check power system stabilizers b. Notify adjacent Transmission and Balancing areas c. Check targets and equ...

A transmission line is operating with a voltage phase angle different of 30 degrees between the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the voltage phase angle difference will be? - Answer The phase angle will increase. When load is increased phase angle will increase. A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw? - Answer 90 pf= mw/mva The high side of a delta-wye connection transformer is connected ...

What percentage of load gives a 1 Hz change in an island condition? - ANSWER 6-10% (Think 6-10 day island vacation) If ACE is Zero but system Hz is off, what should a system operator do? - ANSWER Nothing! ACE bias and interchange schedule will improve frequency If ACE is Zero, why not adjust generation to help frequency? - ANSWER Could overload equipment, this is a NERC violation When restoring from blackout condition, what should be done with load? - ANSWER All load breakers should be ...

1. Balancing Authority A is importing MW and has a tie-Iine flowing into them when the meter fails to zero. Which of the following statements is true? A) The Balancing Authority's frequency will drop B) The Balancing Authority's generators on AGC will decrease output C) The Balancing Authority's frequency will increase D) The Balancing Authority's ACE reading will decrease - Answer B) The Balancing Authority's generators on AGC will decrease output 2. Balancing Authority A has tie-li...

According to Nerc Standards, an emergency interchange transaction can be exempt from tagging if it is less than_________________ - Answer 60 minutes A BA or LSE that requests an EEA 3 must complete and EEA 3 report and submit it to the RC within how many days - Answer 2 business days During restoration efforts load pick-ups should not exceed_____________ percentage of synchronized generation capacity - Answer 5% What are the two components that a system operator should be aware of for c...

System studies identify what - Answer Predict operations and identify constraints If ACE remains the same and frequency goes up what has happened? - Answer Someone lost load When a generator has its AVR in service it is a? - Answer Dynamic source of reactive power Black start resource testing is done every? - Answer 3 years Each BA shall operate its AGC on? - Answer Tie line Frequency Bias When is voltage reduction reportable? - Answer Greater than 3% Reactors do what? - Answer...

Which type of relay operates on the premise of comparing the flow in and out of the area of protection? - ANSWER Differential relay Underfrequency load shedding is set-up so that which of the following does NOT occur? - ANSWER Uncontrolled separation Who is responsible to make sure that the operation of voltage control equipment is coordinated with other impacted entities? - ANSWER Transmission Operator The coordination of voltage schedules by system operators would be utilized to reduc...

What is the calculation used for determining inadvertent interchange? - Answer Net actual interchange minus net scheduled interchange Which of the following would be a suitable use for a pseudo-tie? - Answer Accounting for jointly owned generators Which of the following entities may a Balancing Area provide interchange transaction information to? - Answer PSEs involved in the transaction Which of the following elements are NOT contained in the interchange transaction TAG? - Answer Cost ...

Which type of relay operates on the premise of comparing the flow in and out of the area of protection? - Answer Differential relay Underfrequency load shedding is set-up so that which of the following does NOT occur? - Answer Uncontrolled separation Who is responsible to make sure that the operation of voltage control equipment is coordinated with other impacted entities? - Answer Transmission Operator The coordination of voltage schedules by system operators would be utilized to reduc...