Fish passes, fish locks, fish lifts, etc.
1. Fishway: This is a passage through which fish can pass. It is mainly divided into channel type, pipe type, space type and other types. Channel-type fishways are constructed by constructing artificial rivers or transforming original rivers to make them suitable for fish passage. Pipeline fishways guide fish upstream or downstream by constructing pipelines. The breach type fish pass involves opening breaches in the dam or dam to allow fish to enter upstream and downstream through the breaches.
2. Fish Gate: This is an installation that uses gates to intercept the flow of water. It is mainly used in diversion hydroelectric power stations. When the hydroelectric plant needs to divert water, the valves are openedertes, the water flows and the fish can also reach upstream and downstream through the fish gates. When the hydroelectric plant needs to produce electricity, the doors are closed, water circulates through turbines to produce electricity and fish must pass through fishways.
3. Fish Lift: This is a facility that uses a hydraulic turbine as a power source to lift surface water from downstream to upstream and then lift surface fish downstream. Fish elevators are mainly used in areas with large height differences in rivers, so that fish can reach upstream and downstream via the fish elevator. The advantage of the fish elevator is that it can reduce fish mortality, improve the survival rate of fish, and also improve the power generation efficiency of hydropower plants.es.
Generators are generally composed of stators, rotors, end covers, bearings and other components. The stator consists of the stator core, wire windings, machine base and other structural parts that secure these parts. The rotor is composed of rotor core winding (or magnetic pole, magnetic yoke), retaining ring, center ring, slip ring, fan and a rotating shaft.
The stator and rotor of the generator are connected and assembled by the bearings and end covers, so that the rotor can rotate in the stator and carry out the cutting movement of the magnetic lines of force, thus generating an induced effect. electric potential, which is discharged through the terminals and connected to the circuit, an electric current is generated.
A general generator first converts the energy contained in various primary energy sourcesarea into mechanical energy through the main engine, then converts it into electrical energy through the generator, and then sends it to various energy consumption places through the power supply. transport and distribution networks.
Type
Due to the different forms of primary energy, different generators can be manufactured.
1. Hydraulic generators can be made using hydraulic resources and hydraulic turbines of different capacities and speeds can be made using the position difference. As for the downward flow, the energy of the water flow drives the turbine to produce electricity. However, the disadvantage is that if the position difference is too small and the flow speed is not fast enough, stable power supply cannot be provided.
Currently, there is a way to generate electricity using ocean currents, but the groupElectrogen is often damaged due to strong ocean currents or excessive pressure beneath the sea surface.
2. Using coal, oil and other resources, combined with boilers and steam turbines, turbogenerators can be made. Most of these generators are high speed motors (3000 rpm).
3. Additionally, there are different types of generators that use wind energy, atomic energy, geothermal energy, tides and other energies.
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Development History
When the he electromagnetic induction was discovered, the method of generating alternating current was known. The first finished products were developed by Michael Faraday and Polit Pixie.
In 1866, Werner von Siemens proposed the operating principle of the generator, and a Siemens engineer made the firster alternator.
In 1882, British electrician James Gordon built a large two-phase alternator. Lord Kelvin and Sebastian Ferranti developed the first alternators with frequencies between 100 Hz and 300 Hz.
In 1891, Nikola Tesla patented a “high frequency” alternator (15,000 Hz).
After 1891, polyphase alternators were used to provide power. The alternating current frequency of later alternators was generally designed between 16 Hz and 100 Hz and was used with arc lamps, incandescent lamps or electric motors.
When the magnetic field around a conductor changes, an induced current is generated in the conductor. Typically, the rotating magnet is called a rotor, and the stationary group of conductors wound in a coil around an iron core, called a stator, produces an electric current when it passes through a magnetic field.