The main content of the electrical part of the power plant

The role of a power plant is to convert other forms of energy into electricity.

According to the form of other energy sources, it is divided into: thermal power plants.

Hydroelectric power plants, wind power plants, nuclear power plants, solar power plants.

The function of the substation is to convert the voltage to the voltage required by the hand.

According to the use: step-up substation, reduce loss for long-distance transmission; In the step-down substation, the electric energy reaches the user area and is reduced to the voltage used by the user.

According to the role in the power grid: pivotal blind Bi Niu substation, substation, substation.

Thermal power plants, abbreviated as thermal power plants, are factories that produce electricity from chemical energy from coal, oil, natural gas, or other fuels. The main components of thermal power plants are:

1) Boiler and ancillary equipment to ensure that the chemical energy of the fuel is converted into heat energy.

2) Steam turbine and ancillary equipment to ensure that thermal energy becomes mechanical energy.

3) Generators and exciters to ensure that mechanical energy is converted into electrical energy.

4) The main transformer lifts the electric energy into high-voltage electricity and transmits it to the transmission line. According to the size of the capacity, power plants can be divided into large thermal power plants, medium-sized thermal power plants, and small thermal power plants. However, the term "large", "medium" and "small" is a relative term, such as a large thermal power plant in the 70s, and a medium-sized or even small power plant in the 90s.

According to the initial parameters of working fluid, power plants can be divided into several types of thermal power plants, such as low voltage, medium pressure, high pressure, ultra-high pressure, subcritical and supercritical pressure. According to the different fuels, it can be divided into several types of thermal power plants such as coal-fired, oil-fired and gas-fired; According to the different prime movers, it can be divided into steam turbine power plants, gas turbine power plants, steam turbine gas turbine power plants, etc.; According to the construction and structural characteristics of the main plant, it can be divided into closed thermal power plant, semi-open-pit thermal power plant and open-pit thermal power plant; According to its different functions, it can be divided into condensing power plants and thermal power plants, the former installs condensing units, and the latter installs heating units (also known as heating units).

Although there are many types of thermal power plants, from the perspective of energy conversion, the basic process is the same, that is, the chemical energy, thermal energy, mechanical energy, and electrical energy of the fuel.

Power plant electrical equipment is usually divided into the following three parts:

1. Engine and excitation system. Including generators, main excitation, payment excitation, backup excitation, demagnetization switches, rectifier cabinets, excitation regulators, outlet switches, gate knives, voltage field dismantling transformers, current transformers, related relay protection devices, etc. This part is usually under the jurisdiction of the electrical operation attendant.

2. Booster station part: including main transformer, busbar, outlet, switch, switch, gate knife, voltage transformer, current transformer, lightning arrester, related relay protection device, etc. This part is usually under the jurisdiction of the deputy attendant of electrical operations.

3. Plant power part: including plant high change, plant low change, plant preparation change, plant high-voltage bus, factory high-voltage auxiliary Songhu, factory low-voltage bus, factory low-voltage auxiliary equipment, lighting system, maintenance power supply system, DC system, related relay protection devices, etc. This part is usually under the jurisdiction of an electrician in the electrical operation plant.

Power plant electrical equipment is usually divided into the following three parts: or poor.

1. Engine and excitation system. Including generators, main excitation, payment excitation, standby excitation, demagnetization switches, rectifier cabinets, excitation regulators, outlet switches, gate knives, voltage transformers, current transformers Qi Qin, related relay protection devices, etc. This part is usually under the jurisdiction of the electrical operation attendant.

2. Booster station part: including main transformer, busbar, outlet, switch, switch, switch, voltage transformer, current transformer, lightning arrester, related relay protection devices, etc. This part is usually under the jurisdiction of the deputy attendant of electrical operations. Shirt leather.

3. Plant power part: including plant high change, plant low change, plant preparation change, plant high-voltage bus, factory high-voltage auxiliary, factory low-voltage bus, factory low-voltage auxiliary equipment, lighting system, maintenance power supply system, DC system, related relay protection devices, etc. This part is usually under the jurisdiction of an electrician in the electrical operation plant.

There are the following basic types of power plants according to the energy used:

1) Thermal power plant: Thermal power generation is the use of thermal energy obtained from burning fuels (coal, oil and its products, natural gas, etc.) to generate electricity. There are two main forms of thermal power generation generator sets:

The boiler is used to generate high-temperature and high-pressure steam impulse, and the steam turbine rotates to drive the generator to generate electricity, which is called a steam turbine generator set; The fuel enters the gas turbine and converts the thermal energy directly into mechanical energy to drive the generator to generate electricity, which is called a gas turbine generator set. Thermal power plants usually refer to power plants dominated by steam turbine generator sets.

2) Hydroelectric power plant: Hydropower generation is to divert the river water (or lake water, river water) at the high place to the downstream through the diversion to form a drop, and push the turbine to rotate and drive the generator to generate electricity. A power plant that generates electricity from a hydro-generator set is called a hydroelectric power plant.

Hydroelectric power plants can be divided into the following according to the regulation performance of reservoirs

Run-of-the-river hydropower plant: a hydropower plant without a reservoir that generates as much electricity as you want;

Daily regulated hydropower plant: the reservoir is very small, the regulation cycle of the reservoir is one day and night, and the natural runoff is regulated through the reservoir for one day and one night.

Annually regulated hydropower plant: Optimize the distribution and regulation of natural runoff in each month of the year, store the excess water in the reservoir during the wet season, and ensure the hydropower plant that releases water to generate power during the dry season;

The main contents of the electrical part of the power plant are as follows:

1. The main wiring of the primary system of the power plant, the bus bar, the operating principle of the reverse gate, etc.

2. Operation and maintenance of power plant electrical equipment, generators, transformers, circuit breakers, disconnectors, voltage transformers, rheology, etc.

3. Power plant secondary system, control, metering, signal, DC system, etc.

4. Relay protection device for electrical equipment of power plant.

5. Power plant power system.

6. Electric motors used in power plants and their controls. Wait.

It should be said that they are all more important, especially the working principle and operation method.

The electrical part of the power plant can be divided into three parts:

1. Generator part: including generator, exciter, excitation system, voltage transformer, rheology, demagnetization switch, generator outlet switch, relay device, etc.

2. Booster station part: including main transformer, busbar, switch, gate knife, voltage transformer, rheology, lightning arrester, relay device, etc.

3. Plant power part: including plant high change, plant low change, standby change, plant high-voltage bus, factory high-voltage auxiliary, factory low-voltage bus, plant low-voltage auxiliary. Lighting systems, DC systems, and much more.

Electrical Automation Technology Major Course Question Supplement: Yes College The following are my major courses: Electrical Part of Power Power Plant, Power System Relay Protection, Power System Telecontrol, Power System Automatics, Electrical Control.

It is mainly about the introduction of primary equipment and electrical main wiring of power plants, reasonable selection of primary equipment, and knowledge of power plant operation.

Electrical primary equipment includes: generators, motors, transformers, current transformers, voltage transformers, and capacitors.

plates, disconnectors, circuit breakers, switch cabinets, distribution boxes, grounding switches, reactors, busbars, knife switches, power cables and other electrical equipment directly used in the production, transformation, transmission, channeling, distribution and use of electric energy.

Electrical secondary equipment includes: instruments, relays, control cables, ammeters, voltmeters, power meters, fuses, insulation monitoring equipment, signal equipment, connecting wires, terminals, etc.