电工进网作业（Electrical entry operation）.doc

电工进网作业（Electrical entry operation） The first chapter is basic knowledge of power system 1.1 power systems, power grids The whole power system consists of power generation, power transmission, power transmission, power distribution and power consumption Power transmission, power transmission and distribution have become power networks Power line is the main component of power network, and its function is to transport and distribute electric energy. I. advantages of large electric power: 1, improve the reliability of power supply 2, reduce the reserve capacity of the system 3, through the rational allocation of load 4, improve the quality of power supply 5, easy to use large power Two. Characteristics of power production 1, simultaneity 2, concentration 3, applicability 4, advance 1.2 power load I. composition of power load 1, electricity load 2, line loss load 3 、 power supply load Two, classification A kind of load refers to the sudden interruption of power supply, which will cause personal injury or serious pollution to the surrounding environment and cause great economic losses The two type of load is the sudden interruption of power supply, which can cause huge economic losses Three types of load 1.3 substation Primary substation equipment 1 、 main transformer 2 、 high voltage circuit breaker 3 、 isolating switch 4 、 voltage transformer 5 、 current transformer 6 fuse 7 、 load switch 1.4 power supply quality The quality of power supply refers to the quality of power and the reliability of power supply I. power quality 1, voltage allowable deviation Chinas national standard for 35KV system voltage deviation is +_10% 10kv--------+-7% 220v--------+7% -10% 2 、 voltage fluctuation and flicker Chinas national standard for 35 ~ 110KV system specified voltage fluctuation allowable value is 2%. 3 harmonic of public power grid Thyristor converter with the most serious harmonic generation and large arc furnace 4 、 power frequency deviation Our country stipulates: in 300MW ab