Series and Shunt Compensation of Transmission Lines: The performance of long EHV AC transmission systems can be improved by reactive compensation of series or shunt (parallel) type. Series capacitors and shunt reactors are used to reduce artificially the series reactance and shunt susceptance of lines and thus they act as the line compensators. Series and …
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Load Commutated Chopper Circuit: In this method of Load Commutated Chopper Circuit, the load current flowing through the thyristor is made to become zero while the motor current is conducted by the free-wheeling diode. Figure 10.36(a) shows the circuit of a Load Commutated Chopper. The thyristor pairs Th1Th2 and Th3Th4 alternatively conduct the load current. …
Current Commutated Chopper Circuit: Figure 11.34 shows a Current Commutated Chopper Circuit. The main thyristor Th1 of the chopper is commutated by a current pulse generated in the commutation circuitry. The sequence of operation is given below, and various significant waveforms are shown in Fig. 11.35. It is to be noted that this charging of …
Voltage Commutated Chopper Circuit: This Voltage Commutated Chopper Circuit comprises an auxiliary thyristor Th2, a diode D, inductor L and capacitor C as shown in Fig. 11.32 wherein the total chopper circuitry has been outlined with a dotted box. To start the Voltage Commutated Chopper Circuit, capacitor C is initially charged by firing the thyristor …
What is TRIAC? | Symbolic Representation | VI Characteristics of TRIAC: What is TRIAC? – The full form of TRIAC is Triode for Alternating Current (TRIAC) or Triode for AC. It is a bilateral switch with three terminals—anode, cathode and a single gate. It conducts in either direction being equivalent to two SCRs connected in …
Variable Reluctance Stepper Motor Working Principle: A Variable Reluctance Stepper Motor Working Principle consists of a single or several stacks of stators and rotors-stators have a common frame and rotors have a common shaft as shown in the longitudinal cross-sectional view of Fig. 10.34 for a 3-stack motor. Both stators and rotors have toothed structure …
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Blocked Rotor Test of Induction Motor: This Blocked Rotor Test of Induction Motor is used to determine the series parameters of the Circuit Model Parameters of an induction motor. The circuit is similar to that of a transformer short-circuit test. Short circuiting the load resistance in the circuit model of Fig. 9.8 corresponds to making …
No Load Test of Induction Motor: In this No Load Test of Induction Motor, the motor is run on no-load at rated voltage and frequency. The applied voltage and current and power input to motor are measured by the metering as per Fig. 9.17. Let the meter readings be Power input = P0 (3-phase) Current …
Synchronous Sequential Circuits or Clocked Sequential Circuits: In Synchronous Sequential Circuits or clocked sequential circuits, clocked flip-flops are used as memory elements, which change their individual states in synchronism with the periodic clock signal. Therefore, the change in states of flip-flops and change in state of the entire circuit occurs at the transition of the …
Performance of CMOS Gates: The Performance of CMOS Gates which based on following different categories namely, Operating Speed : Slower than TTL series. Approximately 25 to 100 ns depending on the subfamily of CMOS Inverter Circuit. It also depends on the power supply voltage. Voltage Levels and Noise Margins : The voltage levels for CMOS …