电力系统继电保护课程设计作业（Power system relay protection course design work）.docVIP

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电力系统继电保护课程设计作业（Power system relay protection course design work）.doc

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电力系统继电保护课程设计作业（Power system relay protection course design work） Principle of relay protection course design task book Curriculum design guidelines (1) calculation of phase to phase short circuit protection for 35~110 kV single power ring network. (two) proceeding 1. calculation of short-circuit current and residual voltage Taking into account the 35 ~ 110 thousand volt power supply single phase short-circuit protection ring network is possible with the current and voltage protection with or without direction, so the protection must be decided before, is calculated in detail and the short circuit short circuit when the residual voltage flows for circuit breaker short-circuit current protection and installation department. Then, according to the calculation results, in order to meet the requirements of the technical regulations of relay protection and safety automatic device and the requirements given by the topic, the simplest protection method can be used as far as possible. Calculation and procedures and precautions are as follows. (1) consideration of system operation mode; In addition to considering the power plant generating capacity of the maximum and minimum operation mode, must also consider the removal or maintenance in equipment fault case, short-circuit protection device short-circuit current flows when the maximum and minimum system operation mode, the setting value of sensitivity and protection for the calculation of protection. When the current, voltage interlock and fast break protection are needed, the operation mode between the maximum and the minimum must be considered. Table 1 flows through a protected (an ANN) (Qian An) (2) consideration of short-circuit point In order to draw and curve, the short-circuit point on each line must take at least three points, that is, the beginning, the midpoint and the end of the line three points. Generally in order to simplify calculation, take the three points can be. After the short-circuit point has been deter