In order to make full use of power resources, reduce fuel transportation, and reduce the cost of launching, it is necessary to build hydropower stations where there are hydraulic resources, and to build thermal power plants where there are fuel resources. However, these places with power resources are often far away from the power center, so high-voltage transmission lines must be used for long-distance transmission, as shown in Figure 15-1.
An entire power generation, transmission, substation, distribution, and power supply that connects some power plants, substations, and power users by voltage lines at various levels is called a power system. The power lines of the voltages in the power system and their associated substations are called power f or power network; but it is customary that the electric sputum cans are often distinguished by turtle pressure, such as lOkV. Grid or lOkV1: system.
The electric or system referred to herein actually refers to the entire power line in which a certain voltage level is interconnected. The power grid can be divided into regional power grids and local power grids according to the voltage level and power supply range. The scope of the regional power grid, the voltage is generally 220kV and above. The scope of the local power grid is small, and the maximum voltage generally does not exceed llOkV. The power supply system of the factory is a kind of hand-cranked power grid. The power system plus the power part of the main power plant and its thermal energy system and thermal energy users are called power systems. .
Nowadays, the power systems established by countries are getting bigger and bigger, even establishing multinational power systems or integrated power grids. Establishing a large power system or a joint power grid can make more efficient and rational use of power resources (firstly make full use of water resources), reduce fuel transportation costs, reduce power consumption, reduce power generation costs, and ensure power quality (ie, voltage and frequency meet specifications) ), and greatly improve the reliability of power supply, is conducive to the continued development of the entire national economy.
The process of high voltage transmission is shown in Figure 15-1. From the power plant or substation to boost, the high-voltage power line that delivers power to the step-down transformer station is called the transmission line, and the voltage is generally above 35kV.
The power line that sends power from the step-down substation to the distribution transformer is called a high-voltage distribution line. The voltage is generally 3, 6, or 10 kV.
The line that sends power from the distribution transformer to the point of use is called the low-voltage distribution line, and the voltage is generally 380V and 220V.
In terms of distribution lines, the general voltage is l-lOkV is called high-voltage distribution line, and the voltage below lkV is low-voltage distribution line.
At present, China's power line voltage levels are: 6kV, 8kV, lOkV, 35kV, llOkV, 220kV, 330kV
Long Range Fiberglass Horn Speaker
Long-range glass fiber reinforced plastic Horn Speaker, the box is made of glass fiber and anti-aging agent, durable, beautiful and environmentally friendly, built-in network decoding module, stereo power amplifier, high-fidelity speaker
Remote FRP horn-type integrated network audio decoding speaker, used for audio decoding and sound restoration in broadcast partitions, especially suitable for open-air environments, such as sports venues, parks, exhibitions, etc.
Long Range Fiberglass Horn Speakers,waterproof glass fiber horn speaker,Stadium Horn Speaker,full range horn speaker, Fiberglass Horn Speaker
Taixing Minsheng Electronic Co.,Ltd. , https://www.ms-speakers.com