配电变压器低压侧总自动空气断路器的脱扣器动作电流应如何确定
推荐回答（2个）
配电变压器低压侧进线断路器的选择与整定
2．1 变压器低压侧进线断路器长延时过电流脱扣器的整定倍数
在个别的设计中，进线断路器长延时过电流脱扣器整定值为Ir=1.1In，这是错误的，正确的应为Ir=1.0In。其中In为脱扣器额定电流,A。
因为变压器低压侧进线断路器一般采用框架断路器，通常选用的有ABB、施耐德、西门子、穆勒或国产的常熟断路器厂等的产品，其脱扣器均为四段保护的电子脱扣器；
其中长延时过电流脱扣器的整定值为，Ir=（0.4~1.0）In。各个产品的整定电流级差是不相同的。
如施耐德的Mic 2.0 A／5.0A／6.0A/7.0A，脱扣器Ir=In×0.4、0.5、0.6、0.7、0.8 、0.9 、0.95、0.98、1
如ABB的PR121／P脱扣器Ir=In =x(0．4～1．0)，级差为0.025In ；
PR122／P、PR123／P脱扣器Ir=In =x(0．4～1．0)， ，级差为0．01 In 。
所以进线断路器的长延时过电流脱扣器整定为1.1倍的额定电流是做不到的，这个问题的出现可能是与配电变压器低压侧进线断路器长延时过电流整定电流宜为变压器低压侧额定电流的1.1倍之说相混淆了。
2．2 变压器低压侧进线断路器的保护整定
长延时过电流脱扣器整定为：
Izd1= Kzd1 * Ieb
Kzd1=为断路器长延时脱扣器可靠系数，取1.1。
Ieb=为变压器低压侧额定电流，A。
短延时过电流脱扣器整定为：
Izd2= M * Kzd2 * Ieb (时限可取0.4 s)
M=为过电流倍数，无确定值时可取4 (3～5)
Kzd2=为断路器短延时脱扣器可靠系数，取1.3。
瞬时过电流脱扣器整定为：
Izd3 ≥ 1.2 * Idd1
Idd1=为出线端单相短路电流，A。
为了保证变压器的主保护与出线回路的选择性配合，通常变压器低压侧进线断路器不宜设瞬时过电流保护。
1、过流脱扣器的额定电流Iezk应不低于线路的计算电流Ijs，即Iezk大于等于Ijs。
2、瞬时动作（或0.2~0.6秒短延时动作）的过流脱扣器的整定电流Iszk应躲过线路中可能出现的尖峰电流If,即Iszk大于或等于Kk*If，Kk_可靠系数，动作时间在0.02秒以上的自动开关，可取1.35；动作时间在0.02秒以下的自动开关，可取1.7-2.0；对于多台设备的干线，可取1.3；
3、延时动作（或5-30秒长延时动作）的过流脱扣器的整定电流Iyzk应躲过线路中可能出现的正常过负荷电流Iyf,即Iyzk大于或等于Kk*Igf,Kk_可靠系数,可取1.2，Igf-线路正常的过负荷电流，可取额定负荷电流的1.3-1.4倍。
4、热脱扣器的选择和整定要满足下列条件：（1）、热脱扣器的额定电流Iezk应不小于线路的计算电流Ijs，即Iexk大于或等于Ijs。（2）、热脱扣器应躲过线路上的正常尖峰电流，但在过负荷时应可靠地动作。这可通过实验或自动开关的保护特性曲线进行校验。
因此，您不需掌握10KV系统容量、10KV线路参数及变压器参数！
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