This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Series Reactive Compensators”.
1. TCR is an acronym for ________
a) Thyristor Controlled Reactor
b) Transistor Controlled Reactor
c) Thevenin Controlled Reactor
d) Transistor Controlled Resistance
View Answer
Explanation: TCR is an acronym for thyristor controlled reactor. The thyristor used in this FACT controller is operated with delay at its turning on. Irrespective of the conduction interval of the switch exhibited by the TCR, the TCR is designed to close when current attains zero value.
2. TSC is the abbreviation of ________
a) Transistor Switched Capacitor
b) Thermistor Switched Capacitor
c) Thyristor Switched Capacitor
d) Triac switched Capacitor
View Answer
Explanation: TSC is the abbreviation of thyristor switched capacitor. In its characteristic defined field of compensating reactive power, it acts or responds faster than its counter-part synchronous condenser. This is because the employed 3∅ capacitor banks in TSC are switched on or off by three thyristor switches.
3. TSR is the abbreviation of ________
a) Transistor Switched Reactor
b) Thermistor Switched Reactor
c) Thyristor Switched Reactor
d) Triac Switched Reactor
View Answer
Explanation: TSR is the abbreviation of thyristor switched reactor. As the employed 3∅ reactor banks in TSR are switched on by three thyristor switches, the characteristic feature of TSR to absorb reactive power is controllable. It acts faster than TSC.
4. TSSR is an acronym for ________
a) Thermistor Switched Series Reactor
b) Thyristor Switched Shunt Reactor
c) Thyristor Switched Series Reactor
d) Thevenin Switched Series Reactor
View Answer
Explanation: TSSR is an acronym for Thyristor Switched Series Reactor. It is an inductive reactance compensator. It exhibits stepwise control.
5. TCSR is an acronym for ________
a) Thermistor Controlled Series Reactor
b) Thyristor Controlled Shunt Reactor
c) Thyristor Controlled Series Reactor
d) Thevenin Controlled Series Reactor
View Answer
Explanation: TCSR is an acronym for Thyristor Controlled Series Reactor. By virtue of its characteristic property, TCSR is an inductive reactance compensator. It consists of two reactors, one is a series reactor other is a thyristor switched reactor.
6. TCPST is the abbreviation of ________
a) Thyristor Controlled Phase Shifting Transformer
b) Transistor Controlled Phase Shifting Transformer
c) Thyristor Controlled Power Synchronizing Transformer
d) Thyristor Controlled Power Synchronizing Transformer
View Answer
Explanation: TCPST is the abbreviation of thyristor controlled phase shifting transformer. It employs a phase shifting transformer which is controlled by thyristor switches to give a rapidly variable phase angle. It is also known as Thyristor-controlled Phase Angle Regulator (TCPAR).
7. TCPST is an example of VSC FACTS controller.
a) True
b) False
View Answer
Explanation: Thyristor controlled phase shifting transformer is an example of variable impedance type FACTS controller. It is not a voltage source FACTS controller. TCPST is basically a combined shunt-and-series connected controller.
8. Choose the right option among the alternatives – The TCR is controlled by a turn-on/turn-off delay with respect to the crest of the applied voltage/line current.
a) Turn-on, applied voltage
b) Turn-on, line current
c) Turn-off, applied voltage
d) Turn-off, line current
View Answer
Explanation: The TCR is controlled by a turn-on delay with respect to the crest of the applied voltage. Basically, the TCR controls the current in a fixed inductor from a constant voltage source. Therefore, TCR presents a variable reactive admittance as the load to this source.
9. A turn-on delay with respect to the crest of the bus voltage, applied to the TCR manifests the ________ interval/condition of the switch in the FACT controller.
a) blocking
b) conduction
c) by-passing
d) short-circuiting
View Answer
Explanation: The TCR is, in fact, a switch in series with an inductor. A turn-on delay with respect to the crest of the bus voltage, applied to the TCR manifests the conduction interval/condition of the switch in the FACT controller. The TCR is designed to close at zero current.
10. A transmission line acts as a ________ to the TCR incorporated.
a) current source
b) voltage source
c) no-load source
d) full-load source
View Answer
Explanation: A transmission line acts as a voltage source to the TCR incorporated. This is so because TCR is fed from the transmission bus voltage. The TCR controls the current in a fixed inductor from a constant voltage source.
11. A transmission line sees a TCR connected to it as ________ to it.
a) variable reactive impedance
b) variable reactive admittance
c) constant reactive impedance
d) constant reactive admittance
View Answer
Explanation: A transmission line sees a TCR connected to it as variable reactive admittance to it. It cannot be of a constant value because the TCR switch is controlled with the turning off and on of thyristor as per the command. The resultant is that it is poses reactive admittance which varies accordingly with the switching on and off the thyristor.
12. Choose the right option among the alternatives – TSR/TCR contains shunt/series connected reactor.
a) TSR-series, TCR-shunt
b) TSR-shunt, TCR- series
c) TSR-shunt, TCR-shunt
d) TSR-series, TCR-series
View Answer
Explanation: TSR contains shunt connected reactor. TCR also contains shunt connected reactor. In both TSR and TCR, the shunt connected reactor is controlled by two parallel but reverse connected thyristors.
13. TSR is controlled by dint of firing angle input.
a) True
b) False
View Answer
Explanation: TSR is NOT controlled by dint of firing angle input. No firing angle control is employed in TSR. This results in a change of reactance in steps (NOT continuous).
14. TCR is a ________
a) static VAR generator
b) static VAR absorber
c) static VAR generator or absorber
d) synchronous condenser
View Answer
Explanation: TCR is a static VAR generator or absorber. This is so because the output of the device is regulated to swap either inductive or capacitive current. It exhibits continuous operation being controlled by dint of firing angle input.
15. TSR exhibits harmonic current generation.
a) True
b) False
View Answer
Explanation: TSR does not exhibit harmonic current generation. This attribute gives TSR an advantage over TCR. The current phase control is not employed in the thyristors of a TSR; rather the thyristors are either in fully ON state or OFF state.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
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