Podcast
Questions and Answers
What are the three electrodes usually found in a thyristor?
What are the three electrodes usually found in a thyristor?
- Emitter, collector, and base
- Cathode, diode, and resistor
- Positive, negative, and neutral
- Anode, cathode, and gate (correct)
Which relay can differentiate internal and external faults effectively?
Which relay can differentiate internal and external faults effectively?
- Thermal relay
- Low impedance relay
- Static differential relay
- High impedance relay (correct)
What is the main role of the bus bar in a supply system?
What is the main role of the bus bar in a supply system?
- Ensure voltage balance
- Prevent current transformer saturation
- Carry fault currents safely (correct)
- Interrupt the power supply
What is the purpose of using a linear coupler instead of conventional current transformers in protective relaying?
What is the purpose of using a linear coupler instead of conventional current transformers in protective relaying?
Which type of relay is commonly used for protecting generators and transformers from internal faults?
Which type of relay is commonly used for protecting generators and transformers from internal faults?
How is the connection between contacts and a bimetallic strip made in a simplest thermal relay?
How is the connection between contacts and a bimetallic strip made in a simplest thermal relay?
What is the operating value of a phase comparator of a mho distance relay scheme?
What is the operating value of a phase comparator of a mho distance relay scheme?
Which type of supply does the Induction type relay work on?
Which type of supply does the Induction type relay work on?
What component is considered the 'heart' of a static relay?
What component is considered the 'heart' of a static relay?
In a directional power relay, when does the relay operate?
In a directional power relay, when does the relay operate?
What does the Definite or Fixed time function element provide in relays?
What does the Definite or Fixed time function element provide in relays?
How does a differential relay operate?
How does a differential relay operate?
What is the main factor that determines the operation of distance relays?
What is the main factor that determines the operation of distance relays?
In an impedance relay, which type of torque is produced by the voltage element?
In an impedance relay, which type of torque is produced by the voltage element?
Why are static relays considered to place a reduced burden on protective transformers compared to electromagnetic relays?
Why are static relays considered to place a reduced burden on protective transformers compared to electromagnetic relays?
What is a key requirement for static relays in terms of auxiliary supply?
What is a key requirement for static relays in terms of auxiliary supply?
Which type of relay is known as the simplest type of relay?
Which type of relay is known as the simplest type of relay?
What is the term used for overcurrent level detectors in relays?
What is the term used for overcurrent level detectors in relays?
What type of relay employs active semiconductor devices like diodes and transistors?
What type of relay employs active semiconductor devices like diodes and transistors?
In distance time relays, what is the time of operation proportional to?
In distance time relays, what is the time of operation proportional to?
Which component pivots when attracted towards the coil in a directional relay?
Which component pivots when attracted towards the coil in a directional relay?
What type of relay can withstand overload for minutes or hours depending on the magnitude of the overload?
What type of relay can withstand overload for minutes or hours depending on the magnitude of the overload?
Which relay operates based on the comparison of phase angles and magnitudes of currents entering and leaving the system?
Which relay operates based on the comparison of phase angles and magnitudes of currents entering and leaving the system?
In a reactance relay, how is the operating torque obtained?
In a reactance relay, how is the operating torque obtained?
What is the function of the filter circuit in static relays after rectifiers?
What is the function of the filter circuit in static relays after rectifiers?
What is the restraining value of a phase comparator in a reactance distance relay scheme?
What is the restraining value of a phase comparator in a reactance distance relay scheme?
What is a limitation of static relays?
What is a limitation of static relays?
In Relay with Break type contact, how are the relay coil and trip coil of each phase connected?
In Relay with Break type contact, how are the relay coil and trip coil of each phase connected?
Where does the energy for relay coils in static relays come from?
Where does the energy for relay coils in static relays come from?
What is the primary advantage of induction type cup relays?
What is the primary advantage of induction type cup relays?
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