For generators: Grounding at one point on the generator rotor means that the insulation resistance at one point on the rotor winding is reduced, and this point discharges the rotor core, resulting in a earthing. Two points mean that there are two releases to the ground. When a point is grounded, it does not form a loop, so no current flows and it can continue to operate. However, the ground point must be found and eliminated as soon as possible. When two points are grounded, a loop is formed between the two ground points and the rotor windings between the two points are shorted to form a two-point short to ground.
Dangers of two-point grounding
(1) The current secondary circuit is connected by cables when a short circuit current or lightning current occurs on the grounding network, due to. space at two points of the shielding layer of thecable. Different potentials will cause current to flow in the shielding layer, which may burn the shielding layer. When current passes through the shielding layer, interference signals will be generated for each core wire.
(2) In the current secondary circuit, if there are ground points on both sides of the relay current coil, on the one hand, the parallel circuit formed by the two ground points earth and earth will be short-circuited. circuit the current coil. The current flowing through the current coil is significantly reduced. Additionally, when an earth fault occurs, an earth potential difference will occur between the two earth points due to the zero sequence current passing through the earth network, which will generate a huge additional current in the current coil . These two reasons will cause a large difference between the current passing through the relay current coil and the secondary fault currenttransmitted by the current transformer, which will lead to incorrect protection actions and inaccurate measurements.
Excuse me, if only the live wire comes out of the generator, where does the neutral wire come from?
Tianluo Diwang:
Chen is the Tianluo , and Xu is the earth net. People born in fire meet Xuhai is the Tianluo, and when the fate of water and earth meets Chen, it is the earth network. When Chen sees Si, when Si sees Chen, it is the terrestrial network; The main branch or solar branch is the main branch, and the other earthly branches are the good ones.
The heavenly and earthly nets are mainly responsible for the disasters of diseases, prisons, great fortunes, and are unfavorable to people. The heaven and earth nets have the two virtues of heaven and the moon to save them.
Halo~~~ To see the specific function, it depends on the role of the earth network in the forta specific one. In addition: in the theory of four-pillar divination, the evil spirit is Its function is only an auxiliary.
There are two wires coming out of the 220V generator. Connect one to the hull then ground it. The one connected to the hull and then to ground is the neutral wire;
< There are four wires coming out of the generator. of p>380V. The neutral wire starting from the star point neutral wire is the neutral wire, which is connected to the generator shell, ground wire, etc.6-10KV is a non-grounding operating system. Directly powered high voltage loads are three phase and do not require a neutral line. There is no neutral line in the angular connection and the neutral line in. there is no need to remove the star connection. If low voltage electricity is supplied and the voltage is reduced by a transformer, there will be a neutral line.