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There are two aspects to consider:
1. There are several different standard voltages and connections used by the power company in three phase service.
2. Depends if the voltage is measured phase-to-phase or phase-to-ground/neutral.
The three phase-to-phase (A-B, B-C, C-A) voltages should be roughly equal. In typical service, they may be 208V or 240V.
The phase-to-neutral voltages are sometimes intentionally different. For example, some 3-phase service has a "high leg" that is 208 volts with respect to ground (called a 3 phase high leg delta connection), while the other two legs are 120V with respect to ground, so that you can operate 120V, 240V and 3-phase loads from the same utility service.
The important thing is you should always measure before connecting equipment. 208V will fry most 120V electronics.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agohi above 2000V
medium 600V-2000V
lo voltage below 600V
phase to ground
480 277Y is 277 v to ground (Low)
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Why is mains voltage 230V?
Yes 230 volts is classed as single phase but it is not the only single phase voltage. If you take any two legs from a three phase system, the voltage from these legs is also classed as single phase. The 230 volt single phase is the output of a transformer whose primary is one leg of a three phase primary high voltage system. The 230 volt secondary is center tapped to give 115 volts before the tap and 115 volts after the tap, hence the common voltage of 115/230 that is used in North America.
What is the use of 240 three phase delta?
240 volt delta systems were used a lot in automotive garages and small manufacturing facilities. This system works great for motor loads because of the phase to phase voltage of 240 vac, motors run better (lots of motors were manufactured to operate on 240 only) on the higher voltage compared to 208 vac. Also the availability of 120 vac on the same system was a plus, however on a delta system you have one phase with a higher voltage to ground (high leg) usually about 190 vac. You have to be careful not to use this phase in certain applications.
What wire on a 3 line wooden pylon is live neutral and earth?
If you are referring to a high-voltage line, then it will be a three-phase system, where each of the three conductors is live.
Why is there a high voltage line on 3 phase?
The high leg is a byproduct of another feature. It is not in and of itself useful. On a three phase delta transformer, one of the three windings (only one) is center tapped to create a neutral - from the nearest two phase legs to the center tap you get a half voltage which can be used for lighting. (typical arrangements are phase-to-phase = 240 volt, phase to neutral = 120 volts) From the third, furthest phase leg you get the unusable high leg. (208V)
Why there is different types of voltage range 210 Volt 220 Volt 230 Volt 240 Volt 250 Volt in single phase AC system and what it based?
In the US the voltage is about 220 volts. This voltage is based upon the average voltage of the AC sine wave. It can peak as high as 240 volts or as low as 210 volts. So these different voltages are actually referring to an average 220 volt system.
What is definition of residual voltage?
Net voltage in the Neutral of a three phase electrical system is called residual voltage.
What is the definition of converting electricity?
Electricity is converted from High voltage, 3 phase on the grid to low voltage single phase for domestic use.
Why is mains voltage 230V?
Yes 230 volts is classed as single phase but it is not the only single phase voltage. If you take any two legs from a three phase system, the voltage from these legs is also classed as single phase. The 230 volt single phase is the output of a transformer whose primary is one leg of a three phase primary high voltage system. The 230 volt secondary is center tapped to give 115 volts before the tap and 115 volts after the tap, hence the common voltage of 115/230 that is used in North America.
How much voltage in phase to phase?
First of all, the correct term is 'line to line', not'phase to phase'. The line to line voltage is called a line voltage, and its value depends on the electrical standards in your country, and the point in the electrical tranmission/distribution system where it is measured. In the UK, for example, its value could be between 400 kV (high-voltage transmission line) and 400 V (low-voltage distribution line).
What color is used for phasing medium voltage?
In the electrical trade, there is no such thing as "medium" voltage. Line voltage is broken down into "low" and "high". Low line voltage is 220/110 volt power. In a single phase supply the only required colors are white or grey for the neutral or grounded conductor and green or bare copper for the earth ground, or grounding conductor.In three phase power supplies, low line voltage (220/110) is marked : Phase A -black, Phase B - red, Phase C - blue.In three phase high line voltage (480/277) conductors are marked : A -brown, B - orangeC - yellow. Neutrals are still marked white or grey. White is normally used for low voltage neutrals and grey for high voltage neutrals.In the trade, "low voltage" is considered circuits below 50 volt, such as 12 and 24 volt control circuits, fire alarm, etc.
What is meant by three phase?
Three phase power is a method of electric power transmission using three wires. Three phase power systems may have a neutral wire that allows the system to use a higher voltage while still allowing lower voltage single phase appliances. In high voltage distributions, it is not common to have a neutral wire, as the loads can simply be connected between phases.
What are the applications of three phase to single phase electric power distribution systems?
All high-voltage distribution systems are three-phase. Single-phase 'spurs' off the main line, supplying, for example, farm houses, are simply two lines of a three-phase system.
What will cause my voltage to be higher on one phase and lower on the other?
If secondary side of the 3 phase transformer has any issue, it would result unbalanced voltage between phases. Other reason could be if the load on one phase is highly different than other phase, it also would result in unbalanced voltage.
What is the use of 240 three phase delta?
240 volt delta systems were used a lot in automotive garages and small manufacturing facilities. This system works great for motor loads because of the phase to phase voltage of 240 vac, motors run better (lots of motors were manufactured to operate on 240 only) on the higher voltage compared to 208 vac. Also the availability of 120 vac on the same system was a plus, however on a delta system you have one phase with a higher voltage to ground (high leg) usually about 190 vac. You have to be careful not to use this phase in certain applications.
What is high voltage in marine system?
In the marine system, what is considered high voltages are 3.3 kV, 6.6 kV, and 11 kV. The low voltages, on the other hand, are below 1 kV.
How do you establish no of turns in both high voltage and low voltage windings of a 3 phase transformer?
Through the use of the basic transformer voltage equation.
What do you use to mark the high voltage cable?
Why is use the triangle system in high voltage cables
