Sometimes the neutral is used instead of the ground/earth but it never should be. Using it that way is a violation of code and a demonstration of the laziness and irresponsibility of the person doing the wiring.
For earth fault protection on the windings of a delta connected transformer. Used in MV distribution. An earth fault current return path is provided by connecting a Neutral Earthing Compensator (NEC) between the three phases of the power system and the earth system. This is done at the source of the supply. The NEC transformer winding has a Zig-zag configuration with no secondary winding. The impedance of the winding is high when there is no fault on the system resulting in only a small magnetising current in the transformer windings. The Zig-zag winding configuration results in a low impedance when an earth fault condition occurs. By inserting resistance between the neutral of the Zig-zag transformer and earth, the earth fault currents can be limited to any desired value. The resistance value and rating has been standardised to allow an earth fault current of 300 amp for 10 seconds, although some older installations may still operate at the old standard of 600 amps.
Flexible cord colours are, White for neutral and Green for ground.AnswerIt depends on the standards used in your country. The above answer refers to North America. In Europe, the colours are brown for the line (not 'phase'!) conductor, blue for the neutral conductor, and green/yellow stripe for the earth (ground) conductor. For European three-phase systems, the lines are coloured brown, black, and grey.
Per code the earth should never be used as the sole source of ground. So no.
Neutral, by definition, is grounded at the distribution panel, and also at the distribution pole. That is how the hot to ground voltages are prevented from exceeding their normal voltage and encroaching on truly lethal voltages, such as 7.6kV in a typical US 13.2kV system, in a wye configuration.Note: and this is critical, do not depend on the fact that neutral is grounded and consider that it is the same as protective earth ground. It is not. Protective earth ground is a different wire.
A current transformer is primarily used at the neutral point of a transformer for earth fault protection. A neutral current transformer will measure any ground fault current which will essentially flow from the star point of the transformer. A fault-detection device other devices is connected to the current transformer and, if the fault current exceeds a certain trigger value, the fault-detection device will give a trip command to an earth-fault relay to disconnect the supply of electricity to the transformer.
See this link.
Neutral-earthing reactors or Neutral grounding reactors are connected between the neutral of a power system and earth to limit the line-to-earth current to a desired value under system earth fault conditions.
Neutral is the return path that's used under normal circumstances; earth is the safe return path that is only used during faults to protect the user.
No, an earth wire has a specific safety role in an electrical circuit that does not allow it to be used as one of the two current-carrying wires.
As the neutral point of an electrical supply system is often connected to earth ground, ground and neutral are closely related. Under certain conditions, a conductor used to connect to a system neutral is also used for grounding (earthing) of equipment and structures. Current carried on a grounding conductor can result in objectionable or dangerous voltages appearing on equipment enclosures, so the installation of grounding conductors and neutral conductors is carefully defined in electrical regulations. Where a neutral conductor is used also to connect equipment enclosures to earth, care must be taken that the neutral conductor never rises to a high voltage with respect to local ground.
The earth can be used as a neutral provided the earth is connected to the supply of the network and any of the 3 phases of the supply as a life. All electric supply networks use only 3 HT transmission lines and derived the neutral at the end from the star connection of the step-down transformers secondary windings that is also connected to earth in most countries. There is no neutral running from the power station to the end users step-down transformer, so the earth is a neutral. For more info look at the following link where one can see on the photos of the transmission line only 3 lines is visible. http://en.wikipedia.org/wiki/Three-phase_power See http://en.wikipedia.org/wiki/Ground_and_neutral: Since the neutral point of an electrical supply system is often connected to earth ground, ground and neutral are closely related. Under certain conditions, a conductor used to connect to a system neutral is also used for grounding (earthing) of equipment and structures. Current carried on a grounding conductor can result in objectionable or dangerous voltages appearing on equipment enclosures, so the installation of grounding conductors and neutral conductors is carefully defined in electrical regulations. Where a neutral conductor is used also to connect equipment enclosures to earth, care must be taken that the neutral conductor never rises to a high voltage with respect to local ground.
appropriate resistance is to be inserted between the neutral point of the transformer and the earthing mat to restricted earth fault current. for this purpose a sensitive earth leakage relay is used. in the event of a fault, fault current returning to the system neutral trips an earth leakage relay and disconnects the supply. anand r. ambekar
In up-link the portion of a communications link used for the transmission of signals from an earth terminal to a satellite platform.. a down link is the link from a satellite to a ground station..
To fit a 3-pin socket. The three pins are live, neutral and earth, which must not be confused.
Neutral CTs are used to measure neutral current, which is indicitive of a problem on the power system that protective equipment should interrupt. A similar question would be "why use phase CTs...". Because they can be used to tell the protective device that something is abnormal, and action should be taken. Neutral CTs can be used for several different things - overcurrent tripping, polarizing, and zone limiting (as in restricted earth fault protection for transformer differentials).
For earth fault protection on the windings of a delta connected transformer. Used in MV distribution. An earth fault current return path is provided by connecting a Neutral Earthing Compensator (NEC) between the three phases of the power system and the earth system. This is done at the source of the supply. The NEC transformer winding has a Zig-zag configuration with no secondary winding. The impedance of the winding is high when there is no fault on the system resulting in only a small magnetising current in the transformer windings. The Zig-zag winding configuration results in a low impedance when an earth fault condition occurs. By inserting resistance between the neutral of the Zig-zag transformer and earth, the earth fault currents can be limited to any desired value. The resistance value and rating has been standardised to allow an earth fault current of 300 amp for 10 seconds, although some older installations may still operate at the old standard of 600 amps.
In the UK, the colours were once black = neutral, red = live, and green = earth. The modern standard colours are now blue = neutral (note the l in blue for left contact in the three pin plug used in the UK), brown = live (note the r in brown for right contact), and green and yellow stripes = earth In the US, black= hot wire, white= neutral, green or bare= ground (or earth) red= a second hot wire