What is the role of the grounding of the hydraulic turbine spindle

Due to the uneven air gap (armature magnetic field) of the generator, when the large shaft swings radially, the magnetic field lines are cut and the shaft voltage is generated. When a large shaft has a grounding point, a loop is formed, resulting in a shaft current. The large shaft grounding carbon brush of the turbine is to artificially direct the shaft current to the ground (generator foundation) to prevent the shaft current from burning the tile surface when flowing through the water guide tile, and eventually leading to aggravated friction and burning tile.

Hydraulic turbine spindle: The shaft that connects the turbine runner to the generator rotor and transmits torque. Product name: hydroturbinemainshaft

Hydraulic turbine is a power machine that converts the energy of water flow into rotating mechanical energy, and it belongs to turbomachinery in fluid machinery. As early as around 100 B.C., the prototype of the water turbine appeared in China, the water wheel, which was used to lift irrigation and drive grain processing equipment. Most modern turbines are installed in hydropower plants to drive generators to generate electricity.

In a hydropower station, the water in the upstream reservoir is directed to the turbine through the diversion pipe, which drives the turbine runner to rotate and drives the generator to generate electricity. The water that has been done is discharged downstream through the tailpipe pipe. The higher the head and the higher the flow rate, the greater the output power of the turbine.

Replenish the upstairs, while also preventing the current from deteriorating the oil.

The role of the grounding carbon brush at the large shaft of the generator: 1Elimination of electrostatic voltage from large shaft to ground:

Due to the incomplete insulation of each bearing in the generator, for example: the vertical hydraulic turbine is only insulated by the thrust bearing insulating pad, and there is only less than 1 mm of oil film gap between the other bearings and the large shaft, under the action of suspension potential, it will inevitably break down and discharge the bearing, cause electric shock erosion to the bearing, and further deteriorate the operating environment of the bearing while making the lubricating oil deteriorate; 2.For rotor grounding protection device:

If the rotor is insulated and short-circuited with the rotor, it is difficult to detect a point of grounding of the rotor if there is no grounding carbon brush, and it is even more difficult to avoid the short circuit between layers or phases caused by multi-point grounding; 3.It is used to measure the voltage of the positive and negative poles of the rotor coil to the ground.

Effectively prevent the water in the tail pipe from overflowing from the gap between the spindle and the top cover, prevent the guide bearing and the top cover of the turbine from being flooded, and maintain the normal operation of the bearing and the unit.

The sealing device installed between the main shaft of the turbine and the top cover to prevent water leakage is divided into two types: working seal and maintenance seal.

The more professional manufacturer of spindle seals is Guowei Machinery, and hundreds of domestic and foreign companies are using their taidier seals.

The spindle seal chose Teddy Taidier, and it was not wrong.

You go to the country for ** and take a look, everything is understood!

Purpose of Grounding:

1. In the power system, the grounding required for operation, such as neutral grounding, is called working grounding.

2. The metal shell of electrical equipment, reinforced concrete poles and metal towers, etc., may be charged due to insulation damage, and the grounding set up to prevent this voltage from endangering personal safety is called protective grounding. Protective grounding is the most used security measure for electrical equipment and electrical lines in low-voltage distribution systems and high-voltage power systems where the neutral point is not grounded.

3. Grounding voltage protection devices, such as lightning rods, lightning arresters and clearance guards, etc., are grounded in order to eliminate the danger of overvoltage, which is called overvoltage protection grounding.

4. The grounding of oil-prone fuel oil and natural gas storage tanks and pipelines in order to prevent the impact of static electricity danger is called anti-static grounding.

The role of grounding:

1.Protection against electromagnetic coupling interference: e.g. grounding of digital devices; RF cable wiring, shielding, grounding, etc.;

2.Prevent strong electricity and lightning strikes communication equipment: such as the grounding of the rack and the casing of general communication equipment to prevent equipment, instruments and personal injury;

3.The communication system needs to work: for example, the remote supply system of submarine cable relay equipment adopts the wire-earth system.

Grounding is a safety measure to connect the metal chassis or shell of electric power and telecommunications equipment to the ground wire in order to prevent electric shock or protect the safety of the equipment, and use the earth as the grounding wire of the current loop. In the power system, it is often manifested as a conductor with conductors for equipment and electrical devices, shells or brackets and grounding devices. In addition to the function of grounding some useless current or noise interference into the ground, the maximum function is to protect the user from electric shock, in the case of UPS, some UPS will mark the voltage between the neutral line and the ground wire to ensure that the product will not cause electric shock damage to the human body.

GDWR-5A is recommended.

Are you talking about electrical appliances? It is mainly used in two aspects: the static electricity on the electrical appliance is transmitted to the ground through the grounding wire, and the electrical appliance will not have a large amount of static electricity to bring harm to the user.

Sometimes you can also see the chain under the truck, which is actually grounded and anti-static. In addition, some electrical appliances have a small amount of leakage, and there will be no large amount of charge accumulation if there is a ground wire.

In power equipment, the grounding wire is the lifeline, which plays the role of directing the residual voltage to the earth.

The performance of the grounding wire can be measured with GDDT-30.

The main role of grounding is to be safe! For example, when an electrical appliance without a grounding wire leaks, touch it with your hands or other parts of your body, and the phenomenon of electric people will occur! What if the ground wire is connected?

Then there will be no electricity, because the leaked electricity will flow to the earth through the ground wire! If a leakage switch is installed in the home, it will automatically jump when an electrical appliance leaks to protect it.

The main role of grounding is safety, preventing leakage, and its protective effect.

To prevent electric shock, the current generated in the case of electrical short circuit, leakage, etc., will flow to the ground through the ground wire, which will cause the air switch to trip, thus playing a protective role.

After the shaft diameter reaches a certain level, it has no effect on the torque, so the hollow thin-walled shaft can not only meet the requirements, but also save materials, and at the same time can provide a make-up channel for the runner chamber of the turbine.

Hope it helps.

Yes. The hollow shaft is made with a through hole in the center of the shaft body, and an internal keyway is opened in the through hole, the outer surface of the shaft body is processed with a stepped cylinder, and an external keyway is opened, the central through hole of this shaft is sleeved with the main shaft of the bore pressing, and the input power drives the shaft and is directly transmitted to the bore main shaft by the transmission gear installed on the cylinder on the outer surface of the shaft body.

So a thick shaft, if it is solid, on the one hand, it increases the weight of the spindle, not to mention, the appropriate hollow inside, mechanical properties such as the torque of the large shaft, has fully met the requirements of the transmission torque! What's more, for the unit, it is better to replenish the tail pipe with air through the large shaft! For the through-flow hydro-generator set, or the rotary type unit, the hollow of the large shaft can also be used to install the oil pipe to supply oil to the oil cylinder and constant pressure cavity of the runner, which reduces the weight of the unit, and the mechanical properties are not bad, and it is more conducive to the operation of the maintenance unit.

The main points are as follows: a. It plays the role of intermediate connection, the lower part is connected with the large shaft of the hydraulic turbine, and the upper part is connected with the main shaft of the exciter. b. Bear the rated torque of the unit.

c. Vertical unit, the main bearing of the generator is subjected to tensile stress caused by thrust load. d. Bear the unilateral magnetic pull force and the mechanical unbalanced force of the rotating department.

It is normal for the hydro generator to have shaft current, which is related to the generator manufacturing process, and the large shaft is not in the center of the magnetic field line, or the vibration is too large. The size of the manufacturer did not say, nor have I seen the relevant regulations. Eliminate shaft current with grounded carbon brushes.

Shaft current is the formation of a loop between the rotor and the shaft core caused by the failure of the bearing lubrication, and if the shaft current is generated, the life of the bearing is almost the same.