Relationship between electrical main network structure and electrical main wiring

Relationship between electrical main network structure and electrical main wiring

The power grid is a network of power exchanges. It is a general term for all facilities and equipment that are connected to the power generation terminal and the power terminal. The power generation and power generation equipment and the corresponding auxiliary systems are usually integrated into the power grid. , referred to as the power grid. In particular, the refinery enterprise power grid mentioned here includes a generator system and a power consumption system. The main network structure refers to the grid connection mode of the distribution power level (35kV, 6kV) and above.

The relationship between the electrical main network structure and the electrical main wiring is as follows:

Electrical main wiring, also known as primary wiring of power plants and substations, is composed of primary equipment used directly for production, aggregation, transformation, transmission and distribution of electrical energy, and represents the electrical part of the power plant (substation). The main structure is an important part of the power system network structure. The main network structure is the primary equipment wiring mode of the local power grid, including the main wiring of all power plants, substations in the network and their connection methods, including power supply lines. Therefore, the main network structure of the grid contains the electrical main wiring of all power plants and substations in the network.

The main electrical wiring is the main component of the wiring system of the power system. It shows the number and connection of electrical equipment such as generators, transformers, lines and circuit breakers, and possible modes of operation, thus completing the tasks of generating, transforming, transmitting, distributing, and using electricity. Its determination directly relates to the choice of electrical equipment in the whole plant, the layout of power distribution equipment, the relay protection and the realization of automatic devices, which are related to the safety, reliability, stability, flexibility and economic operation of the power system.

Most of China's large-scale refining and chemical companies are gradually expanded by small and medium-sized enterprises. The terminal load is mainly based on fans, compressors and pump groups driven by large asynchronous motors, plus a small amount of other loads such as synchronous motors and lighting. . Refining and chemical enterprises are more common in adding new installations and expansions, and some large or extra large projects are completely new.

Due to various reasons, some enterprises have expanded the main equipment and increased the power load. Instead of upgrading and upgrading the grid system at the same time, they used the “building blocks” method to build several 110kV total drop and power distribution systems to bring new Increasing the load makes the company not form a unified power grid. This decentralized power supply mode is not conducive to load balancing, weak against external disturbance, high system failure rate, and need to pay the main transformer basic capacity fee. Therefore, when conditions are met, it should be integrated and upgraded to strengthen the main network structure of the enterprise and form a unified internal grid of the enterprise.

Basic requirements for the main network structure

reliability

flexibility

Economic