What is the use of spacers in transmission line?
The key function of a phase spacer is to prevent the approach of phase conductors on a high voltage overhead circuit due to formation of ice sleeves and the presence of strong wind. Such natural events can lead to deflection of conductors that are subjected to the increased mechanical loads being generated.
Why damper is used in transmission line?
Dampers used in transmission lines are of following types. The damper is designed to dissipate the energy of oscillations in the main cable to an acceptable level. Its distinctive shape gives it the nickname “dog-bone damper“. These dampers are used to counteract vibrations excited by wind, so-called Karman vibrations.
What is spacer damper?
Spacer dampers were originally developed to suppress bundle conductor subspan oscillations that could cause damage to multi-conductor bundle systems. AFL’s Spacer Dampers combine the function of a spacer in maintaining conductor separation and the function of a damper in controlling aeolian vibration and oscillation.
What is the distance of spacer in bundled conductor?
The material of the spacer shall be of aluminum alloy of an approved type. 2.6. The spacing shall be so arranged that group spacing between sub-conductors is kept at 300 mm for 220 KV, 132 KV and 33 KV bus & jumper and 450mm. for 400KV Bus and Jumper for new S/stn.
What is a transmission spacer?
SELECT YOUR 4WD. Designed to reduce tail shaft angle and remove driveline vibration that arises from an out-of-phase drivetrain. The universal joints in a vehicle’s tailshaft must operate at the same angle to operate harmoniously.
Why earth wire is used in transmission line?
Ground wires or earth wires are bare conductors supported at the top of transmission towers. They serve to shield the line and intercept lightning stroke before it hits the current carrying conductors below i.e. power lines.
Why do we use damper?
A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. A damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature and climate control.
How do Stockbridge dampers work?
The Stockbridge damper targets oscillations due to aeolian vibration; it is less effective outside this amplitude and frequency range. Aeolian vibration occurs in the vertical plane and is caused by alternating shedding of vortices on the leeward side of the cable.
What are the disadvantages of bundled conductors?
Disadvantages of Bundled Conductors
- Increased ice & wind loading.
- Inspection more complicated, spacers required.
- Increased clearance requirements at structures.
- Increased charging kVA which may be a disadvantage at light loads.
What is stringing chart?
The Stringing Chart displays necessary information for a construction crew to install a conductor. You can input the minimum and maximum ambient temperature to build a chart with a range of stringing values that account for variances of temperature in the field when work begins.
What is a line spacer in a transmission line?
Answer Wiki. Typically a line spacer is used to separate the multiple conductors of one phase of a three phase line. As an example, one of the three phases may have two, three or more conductors run from transmission tower to transmission tower.
Where is the capacitance of a transmission line assumed?
Nominal T Method in Medium Transmission Line. In the nominal T method the capacitance of the line is assumed to be concentrated at the middle point of the line, and at both side half of line resistance and inductance is lumped. V S is the sending end voltage.
How are the parameters of a transmission line affected?
These values are affected by line parameter R, L and C of the transmission line. Length wise transmission lines are three types. A short transmission line is classified as a transmission line with: Only resistance and inductance are taken in calculation capacitance is neglected. A medium transmission line is classified as a transmission line with:
Which is correct transmission function or propagation constant?
These include transmission parameter, transmission function, propagation parameter, propagation coefficient and transmission constant. If the plural is used, it suggests that α and β are being referenced separately but collectively as in transmission parameters, propagation parameters, etc.