Table of Contents
- 1 How much current is in 11kV line?
- 2 When a fault occurs in a high voltage transmission line What happens first?
- 3 What is the difference between earth fault and ground fault?
- 4 Which conductor is used in 11KV line?
- 5 How do you calculate 11KV voltage?
- 6 What is the interrupting medium in the contractor?
- 7 Is there ground clearance from 11 kV line to 25 kV?
- 8 What’s the advantage of stepping up the voltage?
- 9 What is the voltage of an 11kV lightning arrester?
How much current is in 11kV line?
Take a 11kV/415v, 500KVA distribution system. Then maximum current on HV side = 500/{sqrt(3) * 11} = 26.24 A. maximum current on LV side = 500/{sqrt(3) * 0.415} = 695.6 A.
When a fault occurs in a high voltage transmission line What happens first?
a) circuit breaker operates then the relay.
What is the difference between earth fault and ground fault?
Ground Faults are more severe than Earth Faults due to the flow of large amount of current flow, which can damage various equipment of a power system if the fault is not cleared within a specified time. Also if the conductor falls on the ground means, that’s an open circuit fault which is called earth fault.
What is 11KV line?
The 11kV lines are used in residential areas and is what feeds the local transformers, which then distributes power to the buildings in the area. This power can then be safely distributed in order to power a town near the transformer.
What is the minimum ground clear distance for 11KV overhead line?
Clearance above ground of the lowest conductor As per IE Rule 77
| Over head Line Across Street | |
|---|---|
| Low and Medium Voltage | 5.8 Meter |
| Low/Medium /HT line up to 11KV If Insulated Conductor | 4.0 Meter |
| Above 11 KV Line | 5.2 Meter |
| Above 33KV Line | 5.8 Meter + Add 0.3 meter for every additional 33KV |
Which conductor is used in 11KV line?
ACSR Conductors
The other types of conductors (mentioned from S. No. 3 to 7 are all ACSR Conductors and are commonly used on 11kv lines, except Dog conductors.
How do you calculate 11KV voltage?
Voltage Regulation for 11KV, 22KV, 33KV Overhead Line
- % Voltage Regulation = (1.06 x P x L x PF) / (LDF x RC x DF)
- RC = (KV x KV x 10) / ( RCosΦ + XSinΦ)
- Required size of Capacitor (Kvar) = KVA1 (Sin ø1 – [Cos ø1 / Cos ø2] x Sin ø2)
- L = [1 – (KVARC / 2 KVARL) x (2n – 1)]
- % Voltage Rise = (KVAR(Cap) x Lx X) / 10 x Vx2.
What is the interrupting medium in the contractor?
Q. What is the interrupting medium in the contactor? a. Air at atmospheric pressure.
What is the cutoff current in the fuse?
A fuse cuts off current when the current exceeds a safe value due to short circuiting or overloading. When the current becomes large it heats the fuse wire too much. Since the melting point of fuse wire is low it melts and breaks the circuit. Thus current in the circuit is cut off.
What do you mean by 11kV transmission line?
An 11kV line is an electric power transmission line that is designed to carry electric power at 11 kilovolts. The advantage of stepping up the voltage from standard house voltages, e.g., 110V, 120V, 220V, or 240V (depending on where you live), when transmitting power is that it reduces transmission power loss…
Is there ground clearance from 11 kV line to 25 kV?
The fact that the voltage is 11 kV or 25 kV doesn’t really matter on the clearance needed. The clearance is related to external circumstances. The height a line should be elevated to is governed by its use, and ratings. The actual air space needed around a 25kV line to avoid breakdown is only a few cms.
What’s the advantage of stepping up the voltage?
The advantage of stepping up the voltage from standard house voltages, e.g., 110V, 120V, 220V, or 240V (depending on where you live), when transmitting power is that it reduces transmission power loss due to the electrical cable resistivity:
What is the voltage of an 11kV lightning arrester?
11KV LIGHTNING ARRESTER (IS: 3070 (Pt-II)). Voltage Rating for LA: The rated voltage of lightning arresters shall be 9 KV (rms). This will be applicable to the effectively earthed 11 KV systems co-efficient of earth not exceeding 80 percent as per IS: 4004 with all the transformer neutrals directly earthed.