Question

Transmission Lines Insulators Transmission line conductors do not have any insulated coating over it. To maintain safety and necessary clearance between live conductors and metal structure of the support, insulators are mounted. These insulators provide insulation of high voltage wire with the metal structure and also provide support to the conductor. Insulators are also used in providing support to bus-bar conductors and other live high voltage equipment terminals. For overhead lines operating at high voltages, use of number of discs connected in series, through metal links, is made. The whole unit formed by connecting a number of discs in series is known as string of insulators. The line conductor is secured to the bottom disc of the string and the top disc is connected to the cross-arm of the pole or tower. The number of discs depends on the line operating voltage. The following example shows the voltage distribution over a string of insulators: A string of 6 suspension insulators is to be fitted with guard ring. The pin to earth capacitances are equal to C. The values of line to pin capacitances so as to have uniform distribution over the string are:

          Transmission Lines Insulators
Transmission line conductors do not have
any insulated coating over it. To maintain safety
and necessary clearance between live conductors
and metal structure of the support, insulators are
mounted. These insulators provide insulation of
high voltage wire with the metal structure and
also provide support to the conductor. Insulators
are also used in providing support to bus-bar
conductors and other live high voltage
equipment terminals. For overhead lines
operating at high voltages, use of number of
discs connected in series, through metal links, is
made. The whole unit formed by connecting a
number of discs in series is known as string of
insulators. The line conductor is secured to the
bottom disc of the string and the top disc is
connected to the cross-arm of the pole or tower.
The number of discs depends on the line
operating voltage. The following example shows
the voltage distribution over a string of
insulators:
A string of 6 suspension insulators is to be
fitted with guard ring. The pin to earth
capacitances are equal to C. The values of line
to pin capacitances so as to have uniform
distribution over the string are:

Transmission Lines Insulators
Transmission line conductors do not have
any insulated coating over it. To maintain safety
and necessary clearance between live conductors
and metal structure of the support, insulators are
mounted. These insulators provide insulation of
high voltage wire with the metal structure and
also provide support to the conductor. Insulators
are also used in providing support to bus-bar
conductors and other live high voltage
equipment terminals. For overhead lines
operating at high voltages, use of number of
discs connected in series, through metal links, is
made. The whole unit formed by connecting a
number of discs in series is known as string of
insulators. The line conductor is secured to the
bottom disc of the string and the top disc is
connected to the cross-arm of the pole or tower.
The number of discs depends on the line
operating voltage. The following example shows
the voltage distribution over a string of
insulators:
A string of 6 suspension insulators is to be
fitted with guard ring. The pin to earth
capacitances are equal to C. The values of line
to pin capacitances so as to have uniform
distribution over the string are:

Added by Lauren H.

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