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What is the luminous electrical discharge through the air that occurs when high voltages exist across a gap between conductors?
It is called a plasma discharge. It happens when a high voltage, pole top, air switch is opened under load and the current does not immediately stop but conducts through the air as the switch pole faces become further apart. Eventually the resistance of the air-gap overcomes the current flow and the plasma discharge extinguishes itself. These flash overs are hard on the contact points on the switch so long rods (called horns) are placed on the switch contacts so that as the contacts separate, the plasma discharge is drawn away from the contact and up the rods (horns) until the flash over stops. These types of switches are called horn gap switches.
What else can I help you with?
How many voltage 3phase line?
For a three-phase, three-wire, system there are three conductors called 'line conductors', and there is a voltage between any pair of line conductors, so there are three voltages.For a three-phase, four-wire, system there are four conductors: three 'line conductors' and a 'neutral' conductor. So there are three line voltages (voltages between lines) and three phase voltages (voltages between any line conductor and a neutral conductor).
Why capacitors are almost always connected in parallel and not in series?
to provide a discharge path for voltages.
What are some cautions to electrical energy?
It's dangerous at high voltages.
Why the spacing between the conductors of same phase is greater as compared to spacing between different phase conductors in double circuit lines?
I think you mean spacing between line conductors, rather than phase conductors. If there is a greater spacing between line conductors in one circuit, compared with anothercircuit, then the two circuits are operating at different voltages.
What is the difference between bundled conductors and composite conductors?
Bundled conductors are used to reduce the effect of corona. As in place of a single conductor. two conductors are used in parallel the voltage gradient build up is less and thus the ionisation of the surrounding air is decreased. Therefore the effect of corona is reduced.
Line to line voltage?
The conductors between a three-phase supply and a three-phase load are called line conductors not phase conductors, and the voltage measured between them are line voltages, not phase voltages. In the case of a delta supply, the line voltages are numerically equal to phase voltages, but the name remains the same!I have to admit that many people call line conductors 'phase conductors', but many people also say 'irregardless' -that doesn't make it a real word!!
How many voltage 3phase line?
For a three-phase, three-wire, system there are three conductors called 'line conductors', and there is a voltage between any pair of line conductors, so there are three voltages.For a three-phase, four-wire, system there are four conductors: three 'line conductors' and a 'neutral' conductor. So there are three line voltages (voltages between lines) and three phase voltages (voltages between any line conductor and a neutral conductor).
Is a rubber band an insulator or conductors?
Rubber is an insulator for normal voltages.
What is an electrical battery?
It is a storage device for D.C. voltages.
Why capacitors are almost always connected in parallel and not in series?
to provide a discharge path for voltages.
What is a electrical contactor for?
An electrical contractor does the wiring for homes and businesses. They install the wiring and electrical components needed to run electricity. The question asks about a contactor, not a contractor. A contactor is a type of heavy duty electrical relay for using smaller voltages to control much larger voltages.
What are the advantages of transmitting electrical power at high voltages?
For a given amount of power, the higher the voltage the lower the current. This is necessary to minimise the voltage drop along the transmission line, and to reduce energy losses which are proportional to current squared. The advantage of transmiting electrical power at high(er) voltages is that you can use smaller conductors, since the current flow would be less for the same amount of watts. Watts = Volts times Amperes
What are some cautions to electrical energy?
It's dangerous at high voltages.
Why the spacing between the conductors of same phase is greater as compared to spacing between different phase conductors in double circuit lines?
I think you mean spacing between line conductors, rather than phase conductors. If there is a greater spacing between line conductors in one circuit, compared with anothercircuit, then the two circuits are operating at different voltages.
Can you briefly explain the generation of three phase AC electricity?
A three-phase alternator's stator has three, separate, windings each displaced from the other by 120 degrees. The rotor induces a voltage into each winding, in turn, so that the three voltages are 120 electrical degrees apart. The three stator windings are called 'phase windings', and the corresponding voltages are called 'phase voltages'. Typically, these voltages are within the range 11 kV - 25 kV. Voltages beyond this range are impractical, as the necessary insulation levels would require the alternators to be very large indeed. The three windings are connected together in either delta (mesh) or wye (star) configuration. Whichever type of configuration is used, the output from the alternator is supplied to a three-phase step-up transformer for transmission at very high voltages (up to 400 kV in the UK, for example), using three conductors (or sets of conductor) called 'line conductors' (sometimes, incorrectly, called 'phase conductors'), which supply the energy to load centres (large population centres), where the voltages are gradually reduced (in the UK, 275 kV, 132 kV, 33 kV, and 11-kV). Ultimately, a three-phase or single-phase distribution transformer (depending on the load) then steps the voltage down to low-voltage level (in the UK, 400 V / 230 V) for use in residences or commercial premises. There are two types of three-phase conductor configuration, 3-wire and 4 wire. A three-phase, three-wire, system is supplied from a delta-connection, and consists of three line conductors (or 'bundles'*), whereas a four-wire system is supplied from a wye-connection, and comprises three line conductors and a neutral conductor. (*Line conductors are 'bundled' in pairs, or more, to reduce the electrical stress that would otherwise occur at the surface of individual conductors at high voltage.) Voltages between lines are termed 'line voltages', while voltages between a line and neutral are termined 'phase voltages'. For a wye-connected system, the line voltage is 1.732 times the corresponding phase voltage. Single phase supplies can be obtained by connecting a single-phase load either between any two line conductors, or between any line conductor and the neutral conductor -depending on the voltage requirements of the load.
What electrical voltages are used in Bangladesh?
The main voltage is 220 volts at 50 Hz.
What are the standard voltages for transmission?
The standard voltage for transmission is about 115 to 1,200 kV (long-distance transmission). The extreme high voltages are measured more than 2,000 kV and it is exists between conductor and ground.Answer for UKThe standard transmission voltages in the UK are 400 kV and 275 kV. Primary distribution voltages are 132 kV and 33 kV, and secondary distribution voltages are 11 kV and 400 V. These are all line voltages -i.e. voltages measured between line conductors.
