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Which type of transmission line has length up to 80 km?
- a)Short transmission line
- b)Medium transmission line
- c)Long transmission line
- d)Flexible transmission line
Correct answer is option 'A'. Can you explain this answer?
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Which type of transmission line has length up to 80 km?a)Short transmi...
Short Transmission Line:
- When the length of the overhead transmission line is up to about 50 km - 80 km and the line voltage is comparatively up to 20 kV.
- Due to smaller lengths and lower voltage, the capacitance effect is small and may be neglected.
Considered a short transmission line of resistance R and Reactance XL over a length.
Vs is the sending end voltage
VR is the receiving end voltage
I is the load current.
cos ϕR is receiving end power factor
and, cos ϕs is sending end power factor
The phasor diagram of the system can be drawn by taking load current as a reference,
From the phasor,
(OC)2 = (OD)2 + (DC)2
(OC)2 = (OE + ED)2 + (DB + BC)2
V2S = (VR cos ϕR + IR)2 + (VR sin ϕR + IXL)2
Transmission efficiency (η):
The power obtained at the receiving end of a transmission line is generally less than the sending end power due to losses in the line resistance.
Vs is the sending end voltage
VR is the receiving end voltage
I is the load current.
cos ϕR is receiving end power factor
and, cos ϕs is sending end power factor
The phasor diagram of the system can be drawn by taking load current as a reference,
From the phasor,
(OC)2 = (OD)2 + (DC)2
(OC)2 = (OE + ED)2 + (DB + BC)2
V2S = (VR cos ϕR + IR)2 + (VR sin ϕR + IXL)2
Transmission efficiency (η):
The power obtained at the receiving end of a transmission line is generally less than the sending end power due to losses in the line resistance.
The ratio of receiving end power (Power delivered) to the sending end power (Power supplied) of a transmission line is known as the transmission efficiency of the line.
Hence, η = (Power delivered / Power supplied × 100)
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Community Answer
Which type of transmission line has length up to 80 km?a)Short transmi...
Short Transmission Line:
- When the length of the overhead transmission line is up to about 50 km - 80 km and the line voltage is comparatively up to 20 kV.
- Due to smaller lengths and lower voltage, the capacitance effect is small and may be neglected.
Considered a short transmission line of resistance R and Reactance XL over a length.
Vs is the sending end voltage
VR is the receiving end voltage
I is the load current.
cos ϕR is receiving end power factor
and, cos ϕs is sending end power factor
The phasor diagram of the system can be drawn by taking load current as a reference,
From the phasor,
(OC)2 = (OD)2 + (DC)2
(OC)2 = (OE + ED)2 + (DB + BC)2
V2S = (VR cos ϕR + IR)2 + (VR sin ϕR + IXL)2
Transmission efficiency (η):
The power obtained at the receiving end of a transmission line is generally less than the sending end power due to losses in the line resistance.
Vs is the sending end voltage
VR is the receiving end voltage
I is the load current.
cos ϕR is receiving end power factor
and, cos ϕs is sending end power factor
The phasor diagram of the system can be drawn by taking load current as a reference,
From the phasor,
(OC)2 = (OD)2 + (DC)2
(OC)2 = (OE + ED)2 + (DB + BC)2
V2S = (VR cos ϕR + IR)2 + (VR sin ϕR + IXL)2
Transmission efficiency (η):
The power obtained at the receiving end of a transmission line is generally less than the sending end power due to losses in the line resistance.
The ratio of receiving end power (Power delivered) to the sending end power (Power supplied) of a transmission line is known as the transmission efficiency of the line.
Hence, η = (Power delivered / Power supplied × 100)
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Which type of transmission line has length up to 80 km?a)Short transmission lineb)Medium transmission linec)Long transmission lined)Flexible transmission lineCorrect answer is option 'A'. Can you explain this answer?
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