1 分 析
如在不改变断路器动作特性的基础上适当提高分闸线圈上的**动作电压,则可增强断路器分闸回路的抗干扰能力,使之能满足如下要求:
1) 提高分闸线圈两端的**动作电压,期望在30% Un(Un为额定电压)左右;
2) 分闸线圈串上电阻后分闸回路两端的**动作电压不能超过65%Un;
3) 更换分闸线圈后,断路器的分闸时间等动作特性应符合规程要求;
4) 分闸线圈符合分闸电流通流能力的要求,防跳继电器(TBJ启动电流为1A)可靠动作。
当操动机构的分闸阀不改变时,其所需最小开始动作的力F和机械功W将保持不变[1]。
F=6.4(IN)2[S/δ+0.8g(z/l)2]×10-8,kg (1)
在电磁铁参数不变时有:
F∝(IN)2 (2)
W=(IN)2(Gδ0-Gδm)/2=(IN)2Gδ0/2 (3)
式中Gδ0为电磁铁在吸合位置的磁导;Gδm为电磁铁在释放位置的磁导;z,l为电磁铁的结构参数。
由式(1)、(3)可知,若不改变操动机构的动作特性,就要保持分闸线圈的IN(安匝数)不变,在此前提下提高分闸线圈上的**动作电压,有两种方法:
1) 改变阀结构,使分闸阀启动所需的力F和机械功W增加,这样由式(1)、(3)可知,如线圈匝数N和其他参数不变时,就会提高分闸电磁铁开始动作时所需的启动电流Id,从而提高了分闸线圈上的**动作电压;
2) 更换线圈,根据式(1)、(2)、(3)知,分闸阀启动所需的力F和静态机械功W不变时如改变分闸线圈,则更换前后两分闸线圈的IN应不变,故
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