Primitive network is

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Option C: set of uncoupled elements which gives information regarding the characteristics of individual elements only

Explanation & Concepts:
A primitive network consists of a set of elements which are considered isolated or uncoupled from one another. It represents the individual characteristics of each component (like impedance, voltage, or current source) before they are interconnected to form the complete power system network.

Working Principle: In power system analysis, the primitive network provides the fundamental building blocks for building the Bus Admittance or Impedance matrices. Each element is described by its own self-impedance (or admittance) and its internal independent source. By treating elements as uncoupled, we can define their behavior mathematically using the primitive equation, allowing for systematic transformation to the interconnected system model.

Key Formulas: $v_p + e_p = z_p i_p$ — Primitive network equation where $v_p$ is terminal voltage, $e_p$ is source voltage, $z_p$ is primitive impedance, and $i_p$ is current.; $i_p + j_p = y_p v_p$ — Admittance form of the primitive network equation.

Key Points: Primitive elements are mathematically independent (uncoupled).; They serve as the basis for the formation of the bus impedance matrix ($Z_{bus}$) and bus admittance matrix ($Y_{bus}$).; Each element is defined by its own self-impedance and independent source.

Advantages: Simplifies the assembly of complex network matrices.; Provides a modular approach to modeling large power systems.

Disadvantages: Does not inherently represent the physical coupling (e.g., mutual induction) until transformation matrices are applied.; Requires conversion using incidence matrices for system analysis.

Applications: Short circuit studies.; Load flow analysis.; Network topology development.

Additional Info: Primitive network analysis acts as the 'Level 0' in the systematic building of power system models.. Option B is incorrect because coupling is an interconnection property, not a property of the primitive (isolated) network.

Answer: C is correct — Primitive network refers to the conceptual set of uncoupled components where each element's characteristics are defined independently before network interconnection.

Exam Tip: Remember that primitive network matrices are diagonal matrices because the elements are uncoupled; off-diagonal elements only appear after performing the transformation using incidence matrices.

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Option A: sets of individual elements of power system

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Option B: set of coupled elements which gives information regarding the characteristics of individual elements only

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Option D: None of above

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