1769L35E 1746OB16
RockwellAllen-Bradley1769L35E1746OB16仪用互感器根据用途不同可分为电压互感器【TV】和电流互感器【TA】1.电压互感器的构造,电压互感器的基本构造与普通变压器相同,主要铁芯,一次绕组,二次绕组组成。它的一次绕组匝数较多,二次绕组匝数较少。在运行中一次绕组与被测量电路并联。二次侧的各测量仪表,继电器等电压线圈并联后与二次绕组连接。2.电流互感器的构造,电流互感器的构造与普通变压器基本相同,但是一次绕组匝数很少,甚至于只有1匝,二次绕组匝数较多。使用时一次绕组与被测量电路串联,二次侧的各测量仪表,继电器等电流线圈串联后与二次绕组连接使用。二次绕组允许短接,严禁开路,以保证安全。电压互感器和电流互感器故障分析1.电压互感器的常见故障分析;【一】匝数短路;【1】.故障现象,温度升高,有放电声响,高压熔丝断,二次电压表指示值不稳定。【2】.检查试验三相直流电阻不平衡,耐压试验电力增大,不稳定。【3】产生故障原因;制造工艺不良,系统过电压,长期过载,绝缘老化。【二】绕组断线【1】.故障现象断线处可能产生电弧,有放电声响,断线相的电压表指示值降低。【2].检查试验,用万用表电阻挡测量线圈不通。【3】产生故障原因生产是导线焊接工艺不良,或机械强度不足及引出线接线不合理。【三】绕组对地绝缘击穿【1】.故障现象,高压熔丝连续熔断,可能有放电声响。【2】.检查试验,绝缘电阻不合格交流耐压试验不合格。【3】.产生故障原因绝缘老化或有裂纹缺陷,绝缘油受潮绕组内有导电杂物,系统过电压击穿,严重缺油。【四】套管间放电闪络【1】故障现象高压熔丝熔断套管闪络。【2】.产生故障原因,套管受外力机械损伤,套管间有异物,套管严重污染,绝缘不良。二.电流互感器的常见故障分析;【一】互感器过热【1】故障现象有异常气味甚至冒白烟。【2】产生故障原因,电流互感器二次开路同时一次负载电流过大。【二】内部有放电声响【1】故障现象声音异常,引出线与外壳间有火花放电痕迹或现象。【2】产生故障原因绝缘老化受潮引起漏电互感器表面绝缘半导体涂料脱落。【三】主绝缘对地击穿【1】故障现象单相接地表计指示不正常。【2】产生故障原因绝缘老化受潮系统过电压以及制造工艺缺陷。【四】一次或二次绕组匝间或层间短路【1】.故障现象电流表等表计指示不正常。【2】产生故障原因,绝缘老化,受潮,制造工艺缺陷,二次绕组开路产生高压,使得二次绕组过电压其匝间绝缘损坏。电流互感器运行中二次绕组开路的后果现象及处理方法【一】电流互感器运行中二次绕组开路后果;原理分析可知,电流互感器在正常运行时,由于二次绕组所串接的各测量仪表及继电器电流线圈串联等效阻抗值很小,相当于一个短路运行的变压器,其一二次电流所产生磁通的互相去磁作用,是电流互感器铁芯中的磁通密度很小,《在0.1T左右》,所以其铁芯截面选择比较小。当二次绕组开路时,二次电流为零,二次去磁磁通也为零。铁芯中的磁通量会急剧地增大,使得铁芯达到磁饱和状态《一次侧电流达到额定值时,铁芯中磁通密度可达1.4~1.8T》铁芯达到磁饱和将产生下列后果【1】二次绕组及开路两点间产生很高的尖峰波电压,《可达几千伏》威胁设备绝缘和人身安全。【2】铁芯损耗增加,发热严重,有烧坏绝缘的可能。【3】铁芯中将产生剩磁,使电流互感器变比误差和相角误差加大影响计量准确性。【4】仪表指示不正确。【5】继电保护失灵。因此,运行中的电流互感器二次绕组严禁开路,同时对于暂不使用的二次绕组,应将其两端短接并接地。这一点在运行中校队仪表时要特别注意。《二》电流互感器运行中二次绕组开路的现象在运行中的电流互感器二次绕组开路,同时一次侧负载电流较大的情况下可能会出现下列现象。【1】因铁芯发热,有异常气味。【2】因铁芯电磁振动加大,有异常噪声。【3】串接在二次绕组中的有关表计《如电流表·功率表·电度表》指示值减少或为零。【4】二次回路连接端子螺丝松动,可能会有打火现象和放电声响,随着打火,有关表计指针有可能随之摆动。《三》电流互感器运行中二次绕组开路的处理方式电流互感器运行二次绕组开路产生高电压,其重要的原因是一次负载电流很大。因此在处理中应尽可能停电处理;如不能停电也要设法转移或降低一次负载电流,待度过负载高峰后,在停电处理。如果是因二次回路中螺丝松动造成的开路,尽可能降低负载电流和采取必要的安全措施《有监护人·注意操作者身体各部位距带电体安全距离,戴绝缘手套,使用基本绝缘安全工具》的情况下可以不停电修理。如果是高压电流互感器二次绕组出线端口处开路。则限于安全距离,人员不要靠近,必须在停电以后才能处理。《四》仪用互感器故障处理注意事项【1】电压互感器内部有异响并产生烟雾,漏油等严重事故,而一侧《高压》熔丝有未立即熔断,这时应避免隔离开关切断故障电压互感器《这时的电压互感器中的电流可能比较大》,以防拉开隔离开关时产生喷弧。可设法断开有关电源的断路器,然后在无电状态下在拉开电压互感器的隔离开关,注油是电压互感器发生着火时,应先切断电源,然后使用灭火器灭火《二氧化碳灭火器或干粉式灭火器》。【2】电流互感器故障处理注意事项;当电流互感器发生故障时,直接影响一次系统《线路·负载》的运行安全,应及时汇报上级主管和有关部门,并尽快切断故障电流互感器电源,将故障电流互感器停用后在进行处理。在二次绕组开路时的处理方法,可根据现场情况《停电或不停电》处理故障在按其要求采取安全措施后,仍然可以采用。GEMultilinSR469-CASESR469CASESR469-PS-HI-A20SR469PSHIA20SARGEMultilinFeederSR750-RelayPowerManagementModel750-P5-G5-D5-HI-A20-RCustomsservicesandinternationaltrackingprovidedNNBGEMultilinSR750FeederManagementRelay750-P5-G5-S5-HI-A20-R-TGEMultilinSR469Relay469-P5-HI-A20FromCanadaGEGeneralElectricMultilin750-P5-G5-55-HI-A20-RwithSR750-CASESARGEMultilinSR469-P5-HI-A20MotorManagementRelayGeneralElectricSR469CaseGEMultilinSR750FeederManagementRelay750-P5-H1-A20-RFromCanadaGEMULTILINSR760760FEEDERMANAGEMENTRELAY760-P1-G1-S1-HI-A1-RGEMultilinSR469-P1-HI-A20-EMotorManagementRelayGeneralElectricSR469GEMultilinSR750750-P5-G5-S5-LO-A20-RFeederManagementRelaySR750GeneralGEMultilin735-5-5-HI-485SR735FeederProtectionRelayGeneralElectricSR735GEMultilinFeederManagementRelaySR750750-P5-G5-S5-HI-A20-RFromCanadaNNBGEMULTILINSR745C-700CTDAUGHTERBOARDP/N0505-0037-A1NEW*GEMULTILINSR760760FEEDERMANAGEMENTRELAY760-P1-G1-S1-LO-A1-R-T*NIBGEMultilinSR469Relay(Mfg:2006)469-P5-HI-A20FromCanadaGEMultilinSR750750-P5-G5-S5-HI-A1-RFeederManagementRelaySR750GeneralGEMultilinSR469-P5-HI-A20MotorManagementRelayGeneralElectricSR4695AmpGEMultilinFeederSR750-RelayPowerManagementModel750-P5-G5-S5-HI-A1-RCustomsservicesandinternationaltrackingprovidedGEMultilinSR735RelayCustomsservicesandinternationaltrackingprovidedGEMultilinSR760760-P5-G5-S5-LO-A20-RFeederManagementRelaySR760GeneralGEMultilin735-5-5-HI-485SR735FeederProtectionRelayGeneralElectricSR5AGEMultilinSR760-P5-G5-S5-HI-A10-RFeederManagementRelaySR760GeneralGEMultilinSR760-P5-G5-S5-HI-A10-RFeederManagementRelaySR760GeneralGEMultilinREM735-5-5-HI-485SR735FeederProtectionRelayGeneralElectricGEMultilinSR750750-P5-G5-D5-HI-A20-RFeederManagementRelaySR750GeneralGEMultilinFeederProtectionRelaySR735SR735-5-5-HI-485Ver.#25D152D1.000NEWGEMULTILINfeedermanagementRELAYSR745MODEL#W2P5G5HIARE,newOEMoriginalGEMultilinSR469-P5-LO-A20MotorManagementRelayGeneralElectricSR469GEMultilinSR760-P1-G1-S1-LO-A20-RFeederManagementRelaySR760GeneralNEWGEMultilinSR760/SR750FeederProtectionRelay760-P5-G5-S5-HI-A20-R-TNEWGEMULTILINSR735735METERSR735-5-5-LO-485FEEDERPROTECTIONGENERALELECTGEMultilinPowerManagementRelaySR469-P5-HI-A20-EFromCanadaGEMultilinSR469-CASESR469CASENEWGEMultilinMotorManagementRelaySR469RELAY469-P5-HI-A20FromCanadaGEMultilinMotorManagementRelaySR469RELAYSR469-P5-HI-A1FromCanadaGEMultilinSR745TransformerManagementRelay745W2P5G5HIALFromCanadaGEMultilinSR750FeederManagementRelay750-P5-G5-S5-HI-A1-RFromCanadaGEMultilinSR469-CASESR469CASESR469-PS-HI-A20SR469PSHIA20SARGEMultilinFeederSR750-RelayPowerManagementModel750-P5-G5-D5-HI-A20-RCustomsservicesandinternationaltrackingprovidedGEGeneralElectricMultilin750-P5-G5-55-HI-A20-RwithSR750-CASESARGEMultilinSR469-P5-HI-A20MotorManagementRelayGen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