In order to ensure the personal safety and the need of the power system, have strict requirements on generator
The grounding method are work by three kinds of grounding, protective grounding and protection, the purpose of the earth are as follows: 1.
Job earthing grounding is the neutral point grounding, the aim is to: 1)
Reduce the electric shock voltage.
For neutral point grounding system, as the one to the human body to touch one of the other two phase, get an electric shock voltage of phase voltage of 1.
More than seven times;
For the neutral point grounding system, get an electric shock to voltage is close to or equal to the phase voltage.
Cut off the fault device quickly.
For neutral point grounding system, when one phase ground, because the wire and the ground capacitance and insulation resistance, can constitute a current path, the grounding current is very small, not enough to make protective device and cut off power supply, can not ensure the personal safety.
For the neutral point grounding system, when a to earth current is larger, can quickly protection device, disconnect point of failure.
Reduce the electrical equipment insulation level to the ground.
In the neutral point grounding system, when one phase ground, will make the other two phase to ground the voltage to the line voltage.
For the neutral point grounding system, when one to the other two phase to ground voltage phase voltage is close to, so can reduce the insulation level of electrical equipment and power lines.
Protection grounding protection used in the low voltage of neutral point grounding system, its role is: when a motor winding insulation structure has destroyed the shells when charged, if not grounded, the body touch the shell, the equivalent of single-phase electric shock, it may be the risk of electric shock.
And if used the protective earth, when the body touch the shell, because the body's resistance and grounding resistance in parallel, because the human body resistance;
Greater than the grounding resistance, through the body of the current is very small, the risk of electric shock will happen.
Protection by zero protection by zero used in the low voltage of neutral point grounding system, its role is: when a motor winding insulation structure has been destroyed and into the shell, because use protection to zero, to form single phase short circuit, will quickly blown fuse in this phase, the shell is not charged.
Even before the blown fuse body touch the shell, also due to the human body resistance is greater than the line resistance, the electric currents through the body is also very small, not going to happen to get an electric shock risk.
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