镀锌端盖的英文

化工管道设计技术词汇（中英对照完整版）1 管道组成件 Piping component1.1 管子 Pipe管子(按照配管标准规格制造的) pipe管子(不按配管标准规格制造的其他用管) tube钢管 steel pipe铸铁管 cast iron pipe衬里管 lined pipe复合管 clad pipe碳钢管 carbon steel pipe合金钢管 alloy steel pipe不锈钢 stainless steel pipe奥氏体不锈钢管 austenitic stainless steel pipe铁合金钢管 ferritic alloy steel pipe轧制钢管 wrought-steel pipe锻铁管 wrought-iron pipe无缝钢管 seamless (SMLS) steel pipe焊接钢管 welded steel pipe电阻焊钢管 electric-resistance welded steel pipe电熔（弧）焊钢板卷管 electric-fusion (arc)-welded steel-plate pipe螺旋焊接钢管 spiral welded steel pipe镀锌钢管 galvanized steel pipe热轧无缝钢管 hot-rolling seamless pipe冷拔无缝钢管 cold-drawing seamless pipe水煤气钢管 water-gas steel pipe塑料管 plastic pipe玻璃管 glass tube橡胶管 rubber tube直管 run pipe; straight pipe1.2 管件 Fitting弯头 elbow异径弯头 reducing elbow带支座弯头 base elbowk半径弯头 long radius elbow短半径弯头 short radius elbow长半径180°弯头 long radius return短半径180°弯头 short radius return带侧向口的弯头（右向或左向） side outlet elbow (right hand or left hand)双支管弯头（ 形） double branch elbow三通 tee异径三通 reducing tee等径三通 straight tee带侧向口的三通（右向或左向） side outlet tee (right hand or 1eft hand)异径三通（分支口为异径） reducing tee (reducing on outlet)异径三通（一个直通口为异径）reducing tee (reducing on one run)带支座三通 base tee异径三通（一个直通口及分支口为异径） reducing tee (reducing on one run and outlet)异径三通（两个直通口为异径，双头式） reducing tee (reducing on both runs, bull head)45°斜三通 45° lateral45°斜三通（支管为异径） 45° lateral (reducing on branch)45°斜三通(一个直通口为异径) 45° lateral (reducing on one run)45°斜三通(一个直通口及支管为异径) 45° lateral (reducing on one run and branch)Y型三通（俗称裤衩） true “Y”四通 cross等径四通 straight cross异径四通 reducing cross异径四通（一个分支口为异径）reducing cross (reducing on one outlet)异径四通（一个直通口及分支口为异径） reducing cross (reducing on one run and outlet)异径四通（两个分支口为异径） reducing cross (reducing on both outlet)异径四通（一个直通口及两个分支口为异径） reducing cross (reducing on one run and both outlet)异径管 reducer同心异径管 concentric reducer偏心异径管 eccentric reducer锻制异径管 reducing swage螺纹支管台 threadolet焊接支管台 weldolet承插支管台 sockolet弯头支管台 elbolet斜接支管台 latrolet镶入式支管嘴 sweepolet短管支管台 nipolet支管台，插入式支管台 boss管接头 coupling, full coupling半管接头 half coupling异径管接头 reducing coupling活接头 union内外螺纹缩接（俗称补芯） bushing管帽 cap (C)堵头 plug短节 nipple异径短节 reducing nipple; swage nipple1.3 弯管 Bend预制弯管 fabricated pipe bend跨越弯管（^ 形） cross-over bend偏置弯管（~ 形） offset bend90°弯管 quarter bend环形弯管 cirele bend单侧偏置90°弯管（? 形） single offset quarter bendS形弯管 “S” bend单侧偏置U形膨胀弯管（| ?形） single offset “U” bendU形弯管 “U” bend双偏置U膨胀弯管 double offset expansion “U” bend斜接弯管 mitre bend三节斜接弯管 3-piece mitre bend折皱弯管 corrugated bend圆度 roundness1.4 法兰 Flange (FLG）整体管法兰 integral pipe flange钢管法兰 steel pipe flange螺纹法兰 threaded flange滑套法兰（包括平焊法兰） slip-on flange (SO); slip-on welding flange承插焊法兰 socket welding flange松套法兰 lap joint flange (LJF)对焊法兰 welding neckflange (WNF)法兰盖 blind flange, blind孔板法兰 orifice flange异径法兰 reducing flange盘座式法兰 pad type flange松套带颈法兰 loose hubbed flange焊接板式法兰 welding plate flange对焊环 welding neck collar （与stub end相似）平焊环 welding-on collar突缘短节 stub end, lap翻边端 lapped pipe end松套板式法兰 loose plate flange压力级 pressure rating, pressure rating class压力—温度等级 pressure-temperature rating法兰密封面，法兰面 flange facing突面 raised face (RF)凸面 male face (MF)凹面 female face (FMF)榫面 tongue face槽面 groove face环连接面 ring joint face全平面；满平面 flat face; full face (FF)光滑突面 smooth raised face (SRF)法兰面加工 facing finish粗糙度 roughness光滑的 smooth齿形 serrated均方根 root mean square (RMS)算术平均粗糙高度 arithmetical average roughness height (AARH)配对法兰 companion-flange螺栓圆 bolt circle (B.C.)1.5 垫片 Gasket (GSKT)垫片的型式 type of gasket平垫片 flat gasket环形平垫片 flat ring gasket平金属垫片 flat metal gasket夹棉织物的橡胶 elastomer with cotton fabric insertion夹石棉织物的橡胶 elastomer with asbestos fabric insertion夹石棉织物及金属丝加强的橡胶 elastomer with asbestos fabric insertion and with wire reinforcement无石墨压缩白石棉垫片 non graphited compressed white asbestos gasket天然白橡胶垫片 natural white rubber gasket压缩石棉垫片 compressed asbestos class gasket浸聚四氟乙烯的石棉垫片 PTFE impregnated asbestos gasket夹石棉的缠绕金属垫片 spiral-wound metal gasket with asbestos filler内环 inner ring外环，外定位环 outer ring波纹金属垫片 corrugated metal gasket波纹金属包嵌石棉垫片 corrugated metal gasket with asbestos inserted双夹套波纹金属包石棉垫片 corrugated metal double jacketed asbestos filled gasket双夹套垫片 double jacketed gasket金属包石棉平垫片 flat metal jacketed asbestos filled gasket整体金属齿形垫片 solid metal serrated gasket槽形金属垫片 grooved metal gasket环形连接金属垫片 ring joint metal gasket八角环形垫片 octagonal ring gasket椭圆环形垫片 oval ring gasket透镜式垫片 lens gasket非金属垫片 non-metallic gasket1.6 阀门 Valve1.6.1 阀门结构、零件阀轭 yoke外螺纹阀杆及阀轭 outside screw and yoke (OS & Y)阀杆 stem内螺纹 inside screw (IS)阀轭套 yoke sleeve阀杆环 stem ring阀座 valve seat (body seat)阀座环、密封圈 seat ring整体（阀）座 integral seat堆焊（阀）座 deposited seat阀芯（包括密封圈、杆等内件） trim阀盘 disc阀盘密封圈 disc seat阀体 body阀盖 bonnet阀盖衬套 bonnet bush螺纹阀帽 screw cap螺纹阀盖 screw bonnet螺栓连接的阀盖 bolted bonnet (BB)活接阀盖（帽） union bonnet (cap)螺栓连接的阀帽 bolted cap (BC)焊接阀盖 welded bonnet (WB)本体阀杆密封 body stem seal石棉安全密封 asbestos emenen seal倒密封 back seal压力密封的阀盖 pressure-tight bonnet动力操纵器 powered operator电动操纵器 electric motor operator气动操纵器 pneumatic operator液压操纵器 hydraulic operator快速操纵器 quick-acting operator滑动阀杆 sliding stem正齿轮传动 spur gear operated伞齿轮传动 bevel gear operated扳手操作 wrench operated链轮 chain wheel手轮 hand wheel手柄 hand lever (handle)气缸（或液压缸）操纵的 cylinder operated链条操纵的 chain operated等径孔道 full bore; full port异径孔道 reducing bore, reduced port,venturi port短型 short pattern紧凑型（小型） compact type笼式环 lantern ring压盖 gland阀杆填料 stem packing阀盖垫片 bonnet gasket升杆式（明杆） rising stem (RS)非升杆式（暗杆） non-rising stem (NRS)指示器/限位器 indicator/stopper注油器 grease injector可更换的阀座环 renewable seat ring1.6.2 常用阀(1）闸阀 gate valve平行双闸板 double disc parallel seat开口楔形闸板 split wedge挠性整体楔形闸扳 flexible solid wedge整体楔形闸板 solid wedge塞型闸阀 plug gate valve直通型闸阀 through conduit gate valve(2) 截止阀 globe valve球心型阀盘 globe type disc塞型阀盘 plug type disc可转动的阀盘 swivel disc(3) 节流闪阀 throttle valve针阀 needle valve(4) 角阀 angle valve(5) Y型阀（Y 型阀体截止阀） Y-valve (Y-body globe valve)(6) 球阀 ball valve三通球阀 3-way ball valve装有底轴的 trunnion mounted耐火型 fire safe type浮动球型 floating ball type防脱出阀杆 blowout proof stem(7) 蝶阀 butterfly valve对夹式（薄片型） wafer type凸耳式 lug type偏心阀板蝶阀 offset disc burerfly valve; eccentric butterfly valve斜阀盘蝶阀 canted disc butterfly valve连杆式蝶阀 link butterfly valve8) 柱塞阀 piston type valve(9) 旋塞阀 plug valve三通旋塞阀 three-way plug valve四通旋塞阀 four-way plug valve旋塞 cock衬套旋塞 sleeve cock(10) 隔膜阀 diaphragm valve橡胶衬里隔膜阀 rubber lined diaphragm valve直通式隔膜阀 straight way diaphragm valve堰式隔膜阀 weir diaphragm valve(11) 夹紧式胶管阀 pinch valve（用于泥浆、粉尘等）(12) 止回阀 check valve升降式止回阀 lift check valve旋启式止回阀 swing check valve, flap check valve落球式止回阀 ball check valve弹簧球式止回阀 spring ball check valve双板对夹式止回阀 dual plate wafer type check valve无撞击声止回阀 non-slam cheek valve底阀 foot valve切断式止回阀 stop check valve; non-return valve活塞式止回阀 piston check valve斜翻盘止回阀 tilting disc check valve蝶式止回阀 butterfly check valve1.6.3 其它用途的阀安全泄气阀 safety valve (SV)安全泄液阀 relief valve (RV)安全泄压阀 safety relief valve杠杆重锤式 lever and weight type引导阀操纵的安全泄气阀 pilot operated safety valve复式安全泄气阀 twin type safety valve罐底排污阀 flush-bottom tank valve电磁阀 solenoid valve, solenoid operated valve电动阀 electrically operated valve, electric-motor operated valve气动阀 pneumatic operated valve低温用阀 cryogenic service valve蒸汽疏水阀 steam trap机械式疏水阎 mechanical trap浮桶式疏水阀 open bucket trap, open top bucket trap浮球式疏水阀 float trap倒吊桶式疏水阀 inverted bucket trap自由浮球式疏水阀 loose float trap恒温式疏水阀 thermostatic trap金属膨胀式蒸汽疏水阀 metal expansion steam trap液体膨胀式蒸汽疏水阀 liquid expansion steam trap双金属膨胀式蒸汽疏水阀 bimetallic expansion steam trap压力平衡式恒温疏水阀 balanced pressure thermostatic trap热动力式疏水阀 thermodynamic trap脉冲式蒸汽疏水阀 impulse steam trap放气阀（自动放气阀） air vent valve (automatic air vent valve) （疏水阀用）平板式滑动闸阀 slab type sliding gate valve盖阀 flat valve换向阀 diverting valve, reversing valve热膨胀阀 thermo expansion valve自动关闭阀 self-closing gate valve自动排液阀 self-draining valve管道盲板阀 line-blind valve挤压阀 squeeze valve（用于泥浆及粉尘等）呼吸阀 breather valve风门、挡板 damper减压阀 pressure reducing valve, reducing valve控制阀 control valve膜式控制阀 diaphragm operated control valve执行机构 actuator背压调节阀 back pressure regulating valve差压调节阀 differential pressure regulating valve压力比例调节阀 pressure ratio regulating valve1.6.4 未指明结构（或阀型）的阀切断阀 block valve; shut-off valve; stop valve调节阀 regulating valve快开阀 quick opening valve快闭阀 quick closing valve隔断阀 isolating valve三通阀 three way valve夹套阔 jacketed valve非旋转式阀 non-rotary valve排污阀 blowdown valve集液排放阀 drip valve排液阀 drain valve放空阀 vent valve卸载阀 unloading valve排出阀 discharge valve吸入阀 suction valve多通路阀 multiport valve取样阀 sampling valve手动阀 hand-operated valve; manually operated valve锻造阀 forged valve铸造阀 cast valve（水）龙头 bibb; bib; faucet抽出液阀（小阀） bleed valve旁路阀 by-pass valve软管阀 hose valve混合阀 mixing valve破真空阀 vacuum breaker冲洗阀 flush valve第一道阀；根部阀 primary valve根部阀 root valve总管阀 header valve事故切断阀 emergency valve

feeder bay:馈线间隔-------------------------相关电器英语：http://vod4.sj.net.cn/read.php?tid=1993350&page=e[电气英语]lockout relay 出口继电器manual quasi-synchronization 手动准同期automatic quasi-synchronization 自动准同期feeder bay 馈线间隔transducer 变送器auxiliary relay 辅助（中间）继电器sectionalized circuit breaker 分段断路器by-pass bus 旁路断路器bus tie circuit breaker 母联断路器generator-transformer unit 发-变组UPS (uninterrupted power supply) 不停电电源DC system 直流系统rectifier 整流器inverter 逆变器static transfer switch 静态转换开关battery 蓄电池lead-acid battery 铅-酸蓄电池maintenance free battery 免维护蓄电池Cd-Ni battery 镉-镍蓄电池charger 充电器instrumentation 测量meter 表计synchronizing device 同期装置synchronization checking 同期鉴定reactive power 无功功率active power 有功功率leading phase 超前相lagging phase 滞后相KW-hour meter 有功电度表KVAR-hour meter 无功电度表voltage meter 电压表operated in single phase 分相操作insulation supervision meter 绝缘监察表synchroscope 同期表rated input 额定输入rated output 额定输出secondary meter 二次表计failure alarming signal 事故报警信号fault recorder 故障记录fault recollecting and recording device 事故追忆记录装置sampling frequency 采样频率recording duration 记录时间electrical auxiliary control panel 电气辅助控制屏mosaic surface control panel 马赛克控制屏signal indicator 信号指示器mimic diagram 模拟图annunciator 报警器alarming window 报警窗口stand by power 备用电源ASS (automatic synchronizing system) 自动同期系统protective zone 保护范围NPB (nonsegregated phase bus duct) 共箱母线IPB (isolated phase bus duct) 离相封闭母线trip 跳闸system disconnection 系统解列busbar disconnection 母线解列sequence tripping 顺序跳闸system disconnection and field extinguish 解列灭磁differectial protection 差动保护grounding protection 接地保护negative-sequency current protection 负序电流保护single-phase grounding 单相接地unsymmetrical overload 不对称过负荷definite time lag 定时限inverse time lag 反时限over current protection 过流保护short time delay 短延时fast acting fuse 快速熔断器 field circuit breaker 磁场开关 field current 磁场电流 field extinction 灭磁 field flashing equipment 起励设备 field voltage 磁场电压 fire proof blockage 防火堵料 fire proof limit 耐火极限 fire proof partition 耐火隔板 fire protection pillows 阻火包 fire resistant cable 耐火电缆 fire retardant coating 阻燃涂料 flame retardant cable 阻燃（难燃）电缆 flameproof fluorescent lighting fixture 防爆耐火荧光灯 flood lighting 泛光照明 fluorescent lamp 荧光灯 flush mounted 暗装 follow-up circuit 跟踪回路 footcandle ( F.C ) 英尺-烛光 force excitation 强励 force excitation factor 强励系数 forced outage 强迫停机 frame-type circuit breaker 框架式断路器 frequency 频率 fuse 熔断器 fuse blow 熔断器熔断 fuse-switch 熔断器式开关 switching no-load transformer test 分合空载变压器试验 galvanized steel 镀锌钢 garden lighting fixture 庭院灯 generator 发电机 generator hydrogen cooling system 发电机氢冷却系统 generator rotor 发电机转子 generator sealing oil system 发电机密封油系统 generator stator 发电机定子 generator terminal 发电机端子 generator terminal lead 发电机引出线 generator water cooling system 发电机水冷却系统 glare 眩光 graphite brush 石墨碳刷 grounded through resistor 通过电阻接地 horizontal expansion 水平伸缩 horizontal type motor 卧式电动机 hydrogen inner cooled 氢内冷 short-line fault test 近区故障试验 identification 识别 ignitor 触发器 illuminance 照度 impendance voltage 阻抗电压 impregnated paper insulated cable 纸绝缘电缆 incandescent lamp 白织灯 indoor type 户内式 induction motor 诱导电动机 induction voltage regulator 感应调压器 inductive current 电感电流 inner sheath 内护套 insulating rod 绝缘水平 insulation 绝缘 insulation 绝缘 insulation class 绝缘等级 tie transformer 联络变压器 parallel breaking test 并联开断试验 evolving fault breaking test 开断发展性故障试验 knife switch 刀开关 seismic test 抗震试验 light source (illuminant) 光源 lamp lumen depreciation ( LLD ) 光通量衰减系数 layer insulation 层间绝缘 lead box 出线箱 left（right）arrow 单面出口标志灯 light-source colour 光源光色 lighting box 照明箱 luminaire dirt depreciation ( LDD ) 照明器污秽减光系数 luminaries 照明器 lux ( lx. ) 勒克司 sealing test 密封试验 magnetic starter 磁力起动器 main circuit 主电路 main contact 主触头 main exciter 主励磁机 main grounding network (grid) 主接地网 main transformer 主变压器 maintenance 维护 maintenance box 检修箱 maintenance factor ( MF ) 维护系数 maintenance transformer 检修变压器 mechanical life 机械寿命 mercury lamp 水银灯 metal halide lamp 金属卤化物灯 meteorological 气象的 moment 弯矩 motor 电动机 motor maximum torque 电动机最大转矩 MCCB (moulded case circuit breaker) 塑壳式断路器 mounting height above the floor MHf 距地面安装高度 mounting height above the work-place MHwp 距工作面安装高度 mounting type 安装方式 movable type 移动式 moving contacts 动触头 MCB (miniature circuit breaker) 微型断路器 micro-processor based protective relay 微机继电保护 rain proof test 防雨试验 nameplate 铭牌 natural cooling 自冷式 negative pole 负极 negative sequence current 负序电流 negative-sequence impendance 负序阻抗 neutral point 中性点 no powder-filled cartridge fuse 无填料封闭管式熔断器 no-load current 空载电流 no-load loss 空载损耗 noise level 噪音水平 non-liner resistor 非线性电阻 non-synchronous capability 非同期能力 normal lighting box 工作照明箱 nozzles 喷嘴 partial discharge test 局部放电试验 oil conservator 油枕 oil-immersed type transformer 油浸变压器 OLTC (on-load tap-changer) 有载分接开关 fibre-optical cable 光纤电缆 outdoor type 户外式 outer sheath 外护套 open mounted 明装 open-delta connection 开口三角形连接 operation 运行 operation mode 运行方式 over excitation 过励磁 Oxygen index 氧指数 continuous breaking capability test 连续开断能力试验 packing instruction 包装说明 Painting 油漆 parallel 并联 parallel branch 并联支路 parameter 参数 Partial discharge 局部放电 pendant mounted 悬挂 performance test 性能试验 phase 相 phase angle 相角 photoelectric control 光电控制器 pilot exciter 副励磁机plug-in type fuse 插入式熔断器pole slip operation 滑差运行pole-mounting type 柱上式Porcelain insulator 瓷质绝缘子positive 正极positive-sequence impendance 正序阻抗powder-filled cartridge fuse 有填料封闭管式熔断器power cable 动力电缆power factor 功率因数power system 电力系统projection lamp 投光灯pull switch 拉线开关push-button 按钮PVC(polyvinyl chloride) insulated cable 聚氯乙烯绝缘电缆power grid 电网P.U. value 标幺值 quality assurance 质量保证 quality control 质量控制 rated voltage 额定电压 reactance 电抗 reactive current 感性电流 reactor 电抗器 receptacle (socket) 插座 flush mounted fluorescent lighting fixture 嵌入式荧光灯 rectifier 整流器 rectify 整流 reflectance factor 反射系数 relative 有关的 relevant 相关的 residual current circuit breaker 漏电开关 resistance 电阻 resistor 电阻器 rheostat 变阻器 road lighting fixture 路灯 rotor conductor slot 转子线槽 rotor retaining ring 转子护环 rotor slip ring 转子滑环 rotor winding 转子线圈 routine test 例行试验 saturation factor 饱和系数 scope of supply 供货范围 scope of work 工作范围 screw-type fuse 螺旋式熔断器 section insulation 段间绝缘 seismic 地震 self-ballasted lamp 自镇流灯 emergency lighting 应急灯 self-holding push-button 自持按钮 self-mending fuse 自复熔断器 series 串联 series circuit 串联电路 sheath 护套 shell type transformer 壳式变压器 shield 屏蔽 short circuit ratio 短路比 shunt capacitor 并联电容器 shunt reactor 并联电抗器 signal cable 信号电缆 silicon-steel sheet 硅钢片 Single earthing switch 单接地刀 single face exit sign fixture 单面出口标志灯 single pole switch 单极开关 single-phase transformer 单相变压器 site test 现场试验 slider-type rheostat 滑线式变阻器 soil resistivity 土壤电阻率 spacing-to-mounting height ratio S/MHwp 距高比 spare parts 备品备件 special tool 专用工具 split winding type transformer 分裂变压器 squirrel-cage type rotor 鼠笼型转子 stabilized power supply device 稳压电源装置 stanchion mounted 柱上安装 standard type test 标准型式试验 standby exciter 备用励磁机 standing pole mounted 立杆安装 star connection 星形连接 star-delta starter 星-三角起动器 start rheostst 起动变阻器 start-up/stand by transformer 起动/备用变压器starter 起动器starting current 起动电流starting torque 起动转矩static excitation system 静态励磁系统stationary contacts 静触头stator core 定子铁芯stator end cover 定子端盖stator housing 定子外壳stator winding 定子线圈step potential 跨步电压step-down transformer 降压变压器step-up transformer 升压变压器storage 贮存subtransient reactance 次暂态电抗supplementary load loss 附加损耗supporting insulator 支撑绝缘子 surface mounted 吸顶安装 switch 开关 switch-fuse 负荷开关 synchronous motor 同步电动机 synchronous reactance 同步电抗 symmetrical 对称的 tag of cable 电缆标牌 tapping 分接 tapping range 分接范围 tapping step 分接级 TEFC: totally encloused with fan cooler 全封闭风冷型 test report 试验报告 TEWAC: totally encloused with water cooled air cooler 全封闭水空冷型 three-phase transformer 三相变压器 thyristor element 硅整流元件 tin galvanized 镀锡 touch potential 接触电压 transferred potential 传递电位 transformer 变压器 transformer angular displacement 变压器联接组别 transformer cooling system 变压器冷却系统 transformer fitted with O.L.T.C (on-load tap-changer) 有载调压变压器 transformer rated ratio 变压器额定变比 transformer tank 变压器油箱 transformer winding 变压器绕组 transient reactance 暂态电抗 tube fluorescent lighting fixture 简式荧光灯 tungsten halogen lamp 碘钨灯 turn button 旋钮 turn insulation 匝绝缘 un-grounded 不接地 unarmoured cable 非铠装电缆 uniformity ratio 均匀度 unit auxiliary transformer (UAT) 厂用变压器 VCB (vacuum circuit breaker) 真空断路器 vacuum contactor 真空接触器 variable speed motor 可变速电动机 vertical type motor 立式电动机 voltage regulation 电压调整率 voltage regulation error 电压调节误差 voltage regulator 调压器 wall mounted 吸壁 waterproof fluorescent lighting fixture 防水荧光灯 welding 焊接 winding 线圈 wire pipe 电线钢管 wound type rotor 绕线式转子 wrap-around fluorescent lighting fixture 全密封荧光灯water cooled 水冷却XLPE insulated and PVCsheathed power cable 交联聚乙烯绝缘聚氯乙烯护套电力电缆XLPE(cross linked polyethylene) insulated cable 交联聚乙烯绝缘电缆XLPE insulated, steel tape armored and PVC sheathed power cable 交联聚乙烯绝缘钢带铠装聚氯乙烯护套电力电缆yoke 铁轭zero sequence curent 零序电流zero sequence impendance 零序阻抗zigzag connection 曲折形连接switchyard 开关站switchgear 配电装置switch 开关step-up switchyard 升压站out-door type switchgear 户外配电装置in-door type switchgear 户内配电装置high voltage 高压low voltage 低压medium voltage 中压SF6 gas insulated circuit breaker 六氟化硫断路器disconnecting swit

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feeder bay 馈线间隔