- •4.1. The basic laws of the electrical engineering
- •4.2. Equivalent transformations in electric circuits
- •4.2.1. Series connection of elements
- •4.2.2. Parallel connection of elements
- •4.2.3. Mutual equivalent transformations of the parallel and series connection of elements
- •4.2.4. The transformation of delta – to star – connection and back
- •4.2.5. Conversion circuits with the ideal voltage and current sources
- •4.3. The simplest harmonic current circuit
- •4.3.1. Harmonic current circuit with series connection of r , l , c elements
- •Harmonic current circuit with series connection of r, l – elements
- •4.3.3. Harmonic current circuit with series connection of r, c elements
- •4.3.4. Harmonic current circuit with a parallel connection of r, l, c elements
- •4.3.5. Harmonic current circuit with a parallel connection of r, c elements.
- •4.3.6.Harmonic current circuit with a parallel connection of r, l elements
- •4.4. Inductive - coupled circuit
- •4.4.2. Series connection of the magnetic - coupled coils
- •4.4.3. Parallel connection of magnetic coupled coils
- •4.4.4. Notion of the ideal and the real transformers
- •4.5. The of calculation methods of harmonic current circuits
- •4.5.1. Features of harmonic current circuits calculation
- •4.5.2. The equivalent complex circuit
- •4.5.3. Method of Kirchhoff's equations
- •4.5.4. The method of loop currents
- •4.5.5. Method of the nodal voltages
- •4.6. The main theorem of the circuit theory
- •4.6.1. Superposition theorem
- •4.6.2. Theorem on the equivalent generator
- •4.6.3. Reciprocity theorem
- •4.6.4. Compensation theorem
- •4.6.5. Thellegen theorem
- •4.7. The optimal methods of electrical circuits calculation
4.7. The optimal methods of electrical circuits calculation
Depending on the network and the circuit topology it is expedient to use other methods of calculation.
Method of Kirchhoff's equations because of its cumbersome to apply when the number of branches in the network is not more than three.
The method of equivalent transformation is advisable to apply if in the circuit there is only one source of energy. Sometimes this method is useful in conjunction with other methods.
The method of loop currents is advisable to apply for the circuits, the number of independent loops of which do not exceed the number of independent nodes.
Method of the nodal voltages is advisable to apply for the circuits, the number of independent nodes is less the number of independent loops.
Superposition method is advisable to apply for the circuits , the support circuit of which have a simple form and their calculation does not present significant difficulties.
The method of equivalent generator is advisable to apply in the case when it is required to determine the current in one branch or the voltage between two nodes of the circuit.
In the calculation of complex harmonic current circuit with mutual inductance method of Kirchhoff's equations and the method of loop currents are used. Method of the nodal voltages and the method equivalent generator are not applicable.