35kV农村小型化变电所的设计

Design of 35kV Rural Miniaturization Substation

本变电所为终端降压变电所,主要为生活用电和农业灌溉用电所设计的,以三类负荷为主,有少量的二类负荷。35kV侧采用一回进线、主变压器采用两台等容量的SZ9-4000/35型有载调压变压器;35kV母线采用单母线接线方式;主变压器35kV侧采用LW16-35型SF6断路器配合GW4-35D型隔离开关作为保护和控制;10kV侧采用单母线简易分段接线;出线6回;10kV主进线采用ZMD-10/630型真空断路器、出线采用断路器与保护控制器配合作为控制和保护。10kV电容器选用集合式BFM型并联电容器;电流互感器和电压互感器均选用干式互感器;35kV,10kV避雷器全部选用氧化锌避雷器;本方案设两只等高避雷针,以满足对雷击防护,接地网由垂直接地体和水平接地体组成复式接地网,主接地网接地电阻R;避雷针设独立接地体,它与主接地网地中距离,其接地电阻。二次部分对主变压器装设了瓦斯保护、差动保护、过电流保护和过负荷保护,对10kV出线装设速断和过电流保护,对10kV电力电容器装设有时限过电流保护和过电压保护;中央信号装置采用ZC-23型冲击继电器中央复归重复动作的事故信号装置和ZC-23型冲击继电器瞬时预告信号装置,断路器控制与信号采用具有防跳装置的灯光监视控制回路;本方案架构采用高层布置,占地2500m2。

Transformer substation this step down transformer substation for terminal station,mainly for live with electricity and agricultural irrigation with what cable design,relying mainly on three kinds of load,there is a small amount of class II load,35kV side adopt one enter line,main voltage transformer adopt two,etc.SZ9-4000/35 type of capacity transfer and keep the voltage transformer in year;The bus bar of 35kV adopts the single bus bar wiring way;The main voltage transformer 35kV side adopts the Model LW16-35 SF6 circuit breaker to cooperate with the GN4-35D type to isolate the conduct of the switch to protect and control;10kV side adopt single simple and easy to segment wiring bus bar;Qualify for the next round of competitions 6 times;10kV enter line adopt Model ZMD-10/630 vacuum circuit breaker,is it adopt broken circuit their with protect controller cooperate conduct control and protect to qualify for the next round of competitions mainly.10kV condenser selects the set type BFM type for use and connects the condenser in parallel;The mutual inductor of electric current and voltage mutual inductor select the doing type mutual inductor for use;35kV,10kV arrester all select for use and oxidize the zinc arrester;Scheme this set up two wait for high lightning rod,in order to is it protect striking by lightning to satisfy,earth network hang down body and horizontal earth body make up polymorphous earth network directly,main earth network earth resistance R;Lightning rod is it ground body independently to set up,it and main earth network ground middle distance,earth resistance its.Two part install to main voltage transformer gas protect,not differential to protect,pass electric current not to protect and is it is it protect to load to pass,is it install to 10kV speed broken and pass electric current protect,is it have time limit electric current is it protect to 10kV electric condenser with the over voltage to protect to install to qualify for the next round of competitions;Central signal installation adopt ZC-23 type bludgeon relay central involution into repeat accident signal installation and ZC-23 type of movement strike the instantaneous advance notice letter of the relay number device,circuit breaker is a device jumped with signal light of monitor and control the return circuit to defend to have to adopt to control;This scheme builds up and adopts the high level to assign,occupation of land 2500m2.