DL/T596—1996《电力设备预防性试验规程》规定：“高压断路器操动机构分、合闸电磁铁或合闸接触器端子上的最低动作电压应在操作电压额定值30%～65%之间”。GB50190—91《电气装置安装工程电气设备交接试验标准》也规定：“直流或交流的分闸电磁铁，在其线圈端钮处测得的电压大于额定值的65%时，断路器应可靠分闸；当此电压小于额定值的30%时，不应分闸”。

　　某些SF6断路器的液压机构的分闸回路是线圈串有电阻，如平开的LW6-500型，110VDC直流操作电源，分闸回路为分闸线圈(18Ω)外串32Ω电阻。一般认为最低动作电压为分闸回路(包括串联电阻)全电压，如果最低动作电压为30% Un时，分闸线圈两端的动作电压仅为11.88V，显然难以满足抗干扰的需要，有可能出现由于分闸线圈最低动作电压过低，断路器在强电磁干扰下“偷跳”现象。据不完全统计，葛洲坝大江电厂开关站10年来开关偷跳累计达17次，在对葛洲坝换流站5061断路器进行修复、调试期间，发现5061断路器3天内偷跳达5次。

　　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最低动作电压，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最低动作电压，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最低动作电压不能超过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最低动作电压，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最低动作电压；

　　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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Digi ST-1008-GEM2 8 Port SCSI Terminal Server w/ps (Digi/Central Data)

Comtrol 5002505 (no cable) Rocketport Express PCI Quad/Octa

New Comtrol A10087 Rocketport PCI 8J - Retail Boxed

Multitech 01006350 rev a Power Supply 14v a/c output 2 pin with lock (120v a/c

New Digi 62080060F Cable  EBI HDB44 60 inch host to PORTS module

Moxa Nport 5610-8 8 port RJ45

Digi 70001193 Acceleport 4r PCI 422 w/DB25M

Digi 70001194 Acceleport 4r PCI 422 w/DB9

New Digi 70001807 Portserver TS 4 MEI New Retail Sealed

New Digi 76000617 Acceleport Ports/16em Rackmount RJ-45 w/16 inch cable

Digi 50001208-01 Portserver TS 8 RJ-45 Terminal Server w/ps (1 Bad Port)

Comtrol 5302210 w/Octa DB9F RocketPort Plus UPCI 422  w/Octa DB9F

Digi 76000072 Ports 16em RJ-45 Xem w/Cable

Digi 70001733 PORTSERVER TS 16 PORT RJ-45

Digi C/CON-16 Rack C/CON 16-port RS-232 RJ-45 1U rack

New Digi 70001979 Portserver TS 8 MEI New Retail Open Box

Digi 50000491-01 Acceleport 8r PCI 422

New Digi 76000068 Acceleport C/X C/Con 16 RJ45 Factory Sealed Retail Boxed

Digi 76000588 Acceleport 16P RJ45 Box  (No PCI Card)

Equinox 600-590-001 8 Port uPCI Modem Card Full Length

Equinox 600590-KBM1 8 Port uPCI Modem Card Full Length

Equinox 910331/C4 8 Port uPCI Modem Card Full Length

Comtrol 99445-9 DeviceMaster RTS 4port RS232/422/485 w/DB9M ports

New Digi 50000584-02 Open Retail Box C/Con 16 AIX w/p/C4 8 Port uPCI Modem Card Full Length

Comtrol 99445-9 DeviceMaster RTS 4port RS232/422/485 w/DB9M ports

New Digi 50000584-02 Open Retail Box C/Con 16 AIX w/p