Substation transformer - Study guides, Class notes & Summaries

Distribution feeders tend to have a combination of resistive load and inductive load, creating a lagging power factor. what equipment is installed to counter a lagging power factor? - ️️Capacitors. How are the Voltage and Current of an incoming high-voltage transmission line measured? - ️️Meters, relay equipment, and potential or currents transformers. How can opening a grounding connection in a substation be a hazard? - ️️It can interrupt a current flow and create a high voltage a...

___________ Mat bonds to the protective grounds will keep a lineman at an equipotential zone. - ️️Ground Gradient Mat A ________ Will confirm that a underground cable has been isolated. - ️️Spike tool A customer fed by a secondary underground cable complains about erratic power. A voltage reading at the customer may show a normal voltage. What else should be checked? - ️️A break in insolation, check if water or moisture has gotten in the load. Anytime a person is in parallel with ...

Based on the risk formula if the probability of tipping over while working from a bucket truck is low but the consequence could be very high why is the work considered high risk - ️️The consequence is high risk is always high Based on the safe work model shown in figure 1-2, name three elements that have the most direct influence on Safe work - ️️Lockout/tagging, protective equipment, employee training Describe how SF6 gas can be at Hazard - ️️It's heavier than air, so it will d...

Q32618 When a high voltage transmission line circuit breaker trips open as a result of a fault, a synchronous check relay will monitor certain values on both the line side and the bus side of the open circuit breaker. Before the synchronous check relay re-closes the open circuit breaker, which of the following values has to be within a certain limit before the circuit breaker will close automatically? - Answer- •) Frequency •) Voltage Magnitudes •) Phase Angle between the voltages •) ...

NERC SOS Pre-Assessment Questions And Answers (Score A+). When a balancing Authority's ACE is zero, what is true? - Answer :The BA load-interchange-generation balancing while supporting Interconnection Frequency Quiz :In a 3-phase AC generator... - Answer :Each phase is physically offset by 120 degrees Quiz :Inductance is a property of an electric circuit that opposes the change in ___ - Answer :current Quiz :What three values are included in OHM's Law? - Answer :Volts, Amps, impedanc...

You are an external BA with a frequency bais of 20 MW/.1 Hz that sees a frequency of 60.02 due to a large loss of load in the contingent BA. If your generator governor control systems responded to the frequency deviation approximately how much of a generation change would you BA experience? -4MW Net actual interchange minus Net scheduled interchange is what? Inadvertent interchange Suppose your interconnection operators at 59.97 Hz from one minute after midnight to noon and operate a...

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 ...

NERC SOS Pre-Assessment Questions With Answers Latest Updated 2024 (GRADED) What are three primary AGC control models? - Answer :Tie-Line Bias, Constant Frequency, Constant Net Interchange Quiz :When a balancing Authority's ACE is zero, what is true? - Answer :The BA load-interchange-generation balancing while supporting Interconnection Frequency Quiz :In a 3-phase AC generator... - Answer :Each phase is physically offset by 120 degrees Quiz :Inductance is a property of an electric circu...

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...

What is a transmission line? - A line with a voltage over 69kV and transmits large blocks of electricity over long distances List the functions that can be accomplished in an electrical substation: - Step AC voltages up or down; c Change AC to DC and DC to AC Describe a typical distribution feeder circuit: - Contains three phases and a neutral What is the purpose of the distribution transformer on an electric distribution circuit? - To reduce distribution voltages to voltages usable by th...