某冶金机械厂总降压变电所及高压供电系统设计

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某冶金机械厂总降压变电所及配电系统设计

摘要

随着我国国民经济的飞速发展,工业对电力的需求也越来越迫切。随着中国工业规模的不断扩大,对电力供应的安全性、可靠性提出了更高的要求,因此电力系统与用户直接关联的供电系统尤为重要。作为供电系统的主要组成部分,电气设备的质量及其性能的先进性是决定供电系统安全可靠运行的前提条件之一。本设计根据该冶金机械厂的相关资料和实际情况,对该厂的总降压变电所和高压供电系统进行设计。本设计首先根据工厂提供的资料对工厂的负荷情况进行了计算,根据负荷情况对变压器的容量和台数进行了选择。该厂电源由某变电所以35kV 双回路架空线引出,本设计选择在该厂设立总降压变电所先将电压降为厂区供电电压10kV,在由各车间变电所降为负荷所需电压。为保证供电系统的可靠性,总降压变电所采用单母线分段式接线方式,厂区供电系统采用放射式接线方式。通过计算,本设计对各变电所的主要电气设备、电缆和母线进行了选择和校验,对一次侧主要设备进行了继电保护整定,对避雷和接地装置进行了选择。

关键词:变电所;供电系统;电气设备

Title A Design of High V oltage Power Supply System and

Substation for One Metallurgical Machinery Plant

Abstract

With the rapid development of Chinese national economy, demand of industrial electricity is also more urgent. With the constant expansion of Chinese industry, the security of electricity supply, higher requirements for reliability, power system and the user therefore directly related to the power supply system is particularly important.

As a major component of power supply system, electrical equipment quality and performance of advanced power supply system is to determine the safe and reliable operation of one of the prerequisites. The design of Metallurgical Machinery Plant under the relevant information and circumstances, the plant's general step down substation and high voltage power supply system design. First, the design of information provided under the plant load factory conditions were calculated, according to load situation on the transformer capacity and numbers were selected. The plant is powered by a substation to 35kV double circuit overhead line extraction, the establishment of the design choices in the plant reduced the total voltage step-down substation plant first supply voltage 10kV, the load is reduced by the plant substation required voltage. To ensure the reliability of power supply system, the total step-down substation single bus segmental wiring, the factory power supply system with radial terminals. By calculating, the design of the main electrical substation equipment, cables and bus selection and validation carried out on the lightning protection and grounding devices of choice.

Keywords:Substation; Power System;Electrical Equipment

1 绪论 (1)

1.1工厂供电的意义及要求 (1)

1.2工厂供电设计的一般原则 (2)

1.3设计的具体内容 (2)

1.4 工厂原始资料 (3)

2 工厂的电力负荷及其计算 (4)

2.1 工厂的电力负荷 (4)

2.2 车间计算负荷的确定 (4)

2.3 工厂计算负荷的确定 (5)

2.4 无功功率补偿及其计算 (7)

3 降压变电所及变压器的选择 (9)