Subject and UNIT: Electric Circuit Analysis: Unit V: Resonance and coupled circuits
An A.C. circuit comprising of R, L and C is said to be in resonance when the applied voltage (source voltage) and the source current are in phase. Thus, at resonance the power factor of the circuit is unity and the circuit acts as purely resistive.
Three phase circuits | Electric Circuit Analysis
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
Electric Circuit Analysis: Unit IV: Three phase circuits : Exercise
Electric Circuit Analysis
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
For the clockwise rotation of the magnetic field, the phase sequence is called positive phase sequence ie., RYB.
Three phase circuits | Electric Circuit Analysis
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
Electric Circuit Analysis: Unit IV: Three phase circuits : Additional solved problems
Three phase power measurement by 2 wattmeter method
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
Electric Circuit Analysis: Unit IV: Three phase circuits : Worked examples
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
This method is applied usually for measuring the electrical power in 3-phase, 3-wire circuit. The load may be balanced or unbalanced. It may be connected either in delta or star.
Balanced star, delta connected load | Three phase circuits
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
Electric Circuit Analysis: Unit IV: Three phase circuits : Worked examples
Three phase circuits
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
Fig.4.10 shows a balanced delta - connected load of impedance Z in each phase.
Three phase circuits
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
The 3 phase generators supply energy to the loads which may be connected either in star or delta. When the load impedances in all the three phases are identical, the load is said to be balanced.
1.Star or Y, 2.Delta or Mesh Connection
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
The three phases are interconnected to (i) achieve the economy. (ii) reduce the number of conductors and space. (iii) reduce the complexity of the circuit
Three phase circuits
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
RYB is called positive phase sequence whereas RBY is called negative phase sequence. Unless specified clearly, we take positive phase sequence.
Subject and UNIT: Electric Circuit Analysis: Unit IV: Three phase circuits
The rms value of voltage in each phase = Em / √2