Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Self GMD method is used to evaluatea)Inductan...
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Self GMD method is used to evaluate
- a)Inductance
- b)Capacitance
- c)Inductance and capacitance both of the over head transmission lines
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Self GMD method is used to evaluatea)Inductanceb)Capacitancec)Inductan...
Self GMD (Geometric Mean Distance) method is used to evaluate the inductance of overhead transmission lines.
Inductance is an important parameter in the analysis and design of electrical transmission systems. It is a measure of the ability of a circuit to store energy in a magnetic field when an electric current flows through it. Inductance is typically represented by the symbol L and is measured in henries (H).
The Self GMD method is based on the concept of mutual inductance between the different phases of a transmission line. Mutual inductance is the property of a circuit in which the magnetic field created by the current in one circuit induces a voltage in another circuit. In the case of overhead transmission lines, the mutual inductance between the conductors of different phases is considered.
The Self GMD method calculates the inductance based on the geometric mean distance between the conductors of the transmission line. The geometric mean distance is calculated by taking the square root of the product of the distances between the conductors in each pair of phases. This method takes into account the arrangement and spacing of the conductors, as well as the geometry of the transmission line.
The inductance of a transmission line can be calculated using the following formula:
L = 2 × 10^-7 × ln(GMD / r)
Where:
L is the inductance per unit length of the transmission line
GMD is the geometric mean distance between the conductors
r is the radius of the conductor
The Self GMD method is commonly used in the analysis and design of overhead transmission lines because it provides a simple and accurate estimation of inductance. It takes into account the arrangement and spacing of the conductors, which can significantly affect the inductance of the transmission line.
In conclusion, the Self GMD method is used to evaluate the inductance of overhead transmission lines. It calculates the inductance based on the geometric mean distance between the conductors and provides a simple and accurate estimation of inductance.
Inductance is an important parameter in the analysis and design of electrical transmission systems. It is a measure of the ability of a circuit to store energy in a magnetic field when an electric current flows through it. Inductance is typically represented by the symbol L and is measured in henries (H).
The Self GMD method is based on the concept of mutual inductance between the different phases of a transmission line. Mutual inductance is the property of a circuit in which the magnetic field created by the current in one circuit induces a voltage in another circuit. In the case of overhead transmission lines, the mutual inductance between the conductors of different phases is considered.
The Self GMD method calculates the inductance based on the geometric mean distance between the conductors of the transmission line. The geometric mean distance is calculated by taking the square root of the product of the distances between the conductors in each pair of phases. This method takes into account the arrangement and spacing of the conductors, as well as the geometry of the transmission line.
The inductance of a transmission line can be calculated using the following formula:
L = 2 × 10^-7 × ln(GMD / r)
Where:
L is the inductance per unit length of the transmission line
GMD is the geometric mean distance between the conductors
r is the radius of the conductor
The Self GMD method is commonly used in the analysis and design of overhead transmission lines because it provides a simple and accurate estimation of inductance. It takes into account the arrangement and spacing of the conductors, which can significantly affect the inductance of the transmission line.
In conclusion, the Self GMD method is used to evaluate the inductance of overhead transmission lines. It calculates the inductance based on the geometric mean distance between the conductors and provides a simple and accurate estimation of inductance.
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Self GMD method is used to evaluatea)Inductanceb)Capacitancec)Inductan...
Self GMD or GMR:
- Self GMD is also called GMR. GMR stands for Geometrical Mean Radius.
- GMR is calculated for each phase separately.
- self-GMD of a conductor depends upon the size and shape of the conductor
- GMR is independent of the spacing between the conductors.
GMD:
- GMD stands for Geometrical Mean Distance.
- It is the equivalent distance between conductors.
- GMD depends only upon the spacing
- GMD comes into the picture when there are two or more conductors per phase.
The inductance of the single-phase two-wire line is
GMD = Mutual Geometric Mean Distance = D
GMR = 0.7788r
r = Radius of the conductor
The capacitance between two conductors is
In the calculation of the capacitance, the inner radius of the conductor not considered
Therefore, The self GMD method is used to evaluate Inductance only.
GMD = Mutual Geometric Mean Distance = D
GMR = 0.7788r
r = Radius of the conductor
The capacitance between two conductors is
In the calculation of the capacitance, the inner radius of the conductor not considered
Therefore, The self GMD method is used to evaluate Inductance only.
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Self GMD method is used to evaluatea)Inductanceb)Capacitancec)Inductance and capacitance both of the over head transmission linesd)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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