电力系统继电保护常用词汇

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1、电力系统继电保护常用词汇1 Directional protection 方向保护2 Distance protection 距离保护3 Over current protection 过流保护4 Pilot protection 高频保护5 Differential protection 差动保护6 Rotor earth-fault protection 转子接地保护7 Stator earth-fault protection 定子接地保护8 Over fluxing protection 过励磁保护9 Back-up protection 后备保护11 Sequential tripp

2、ing 顺序跳闸12 Start up/Pick up 起动13 Breaker 断路器14 Disconnecting switch 隔离开关15 Current transformer 电流互感器16 Potential transformer 电压互感器17 Dead zone/Blind spot 死区18 Vibration/Oscillation 振荡19 Reliability 可靠性20 Sensitivity 灵敏性21 Speed 速动性22 Selectivity 选择性23 Step-type distance relay 分段距离继电器24 Time delay 延时

3、25 Escapement/interlock/blocking 闭锁26 Incorrect tripping 误动27 Phase to phase fault 相间故障28 Earth fault 接地故障29 Through- fault 穿越故障30 Permanent fault 永久性故障31 Temporary fault 瞬时性故障32 Overload 过负荷34 Contact multiplying relay 触点多路式继电器35 Timer relay 时间继电器40 Ground fault relay 接地故障继电器41 Recloser 重合闸42 Zero-

4、sequence protection 零序保护43 Soft strap 软压板44 Hard strap 硬压板45 High resistance 高阻46 Second harmonic escapement 二次谐波制动47 CT line-break CT 断线48 PT line-break PT 断线49 Secondary circuit 二次回路50 AC circuit breaker 交流开关电路51 AC directional over current relay 交流方向过流继电器52 Breaker point wrench 开关把手53 Breaker tri

5、p coil 断路器跳闸线圈54 Bus bar 母线; 导电条55 Bus bar current transformer 母线电流变压器56 Bus bar disconnecting switch 分段母线隔离开关57 Bus compartment 母线室; 汇流条隔离室58 Bus duct 母线槽; 母线管道59 Bus hub 总线插座60 Bus line 汇流线61 Bus insulator 母线绝缘器62 Bus request cycle 总线请求周期63 Bus reactor 母线电抗器64 Bus protection 母线保护65 Bus rings 集电环66

6、 Bus rod 汇流母线67 Bus section reactor 分段电抗器68 Bus structure 母线支架; 总线结构69 Bus tie switch 母线联络开关70 Bus-bar chamber 母线箱71 Bus-bar fault 母线故障72 Bus-bar insulator 母线绝缘子73 Busbar sectionalizing switch 母线分段开关74 Current attenuation 电流衰减75 Current actuated leakage protector 电流起动型漏电保护器76 Current balance type cu

7、rrent differential relay 电流平衡式差动电流继电器;差动平衡式电流继电器77 Current changer 换流器78 Current compensational ground distance relay 电流补偿式接地远距继电器79 Current consumption 电流消耗80 Coil adjuster 线圈调节器81 Coil curl 线圈82 Coil current 线圈电流83 Coil end leakage reactance 线圈端漏电抗84 Coil inductance 线圈电感85 Current transformer phas

8、e angle 电流互感器相角86 Distance relay; impedance relay 阻抗继电器87 Power rheostat 电力变阻器88 Electrically operated valve 电动阀门89 Electrical governing system 电力调速系统90 Field application relay 励磁继电器; 激励继电器91 High tension electrical porcelain insulator 高压电瓷绝缘子92 Option board 任选板; 选配电路板; 选择板93 Oscillator coil 振荡线圈94

9、Over-Voltage relay 过压继电器95 Power factor relay 功率因素继电器96 Protection against overpressure 超压防护97 Protection against unsymmetrical load 不对称负载保护装置98 Protection device 保护设备; 防护设备99 Protection reactor 保护电抗器100 Protection screen 保护屏101 Protection switch 保护开关102 Insulator cap 绝缘子帽; 绝缘子帽103 Insulator chain 绝

10、缘子串; 绝缘子串104 Insulator arc-over 绝缘子闪络; 绝缘子闪络105 Insulator arcing horn 绝缘子角形避雷器; 绝缘子角形避雷器106 Insulator bracket 绝缘子托架; 绝缘子托架107 Impedance compensator 阻抗补偿器108 Resistance grounded neutral system 中心点电阻接地方式109 Reactance bond 电抗耦合; 接合扼流圈110 Reactance of armature reaction 电枢反应电抗111 Under-Voltage relay 欠压继电

11、器112 Voltage differential relay 电压差动继电器114 Relay must-operate value 继电器保证启动值116 Relay overrun 继电器超限运行117 Longitudinal differential protection 纵联差动保护118 Phase-angle of voltage transformer 电压互感器的相角差119 Zero-sequence current/residual current 零序电流120 Residual current relay 零序电流继电器121 Bus bar protection/

12、bus protection 母线保护122 Breaker contact point 断路器触点123 Cut-off push 断路器按钮124 Gaseous shield 瓦斯保护装置125 Neutral-point earthing 中性点接地126 Internal fault 内部故障127 Auxiliary contacts 辅助触点128 Neutral auto-transformer 中性点接地自耦变压器129 Fuse box/fusible cutout 熔断器130 Pulse relay/surge relay 冲击继电器131 Auxiliary rela

13、y/intermediate relay 中间继电器132 Common-mode voltage 共模电压133 Impedance mismatch 阻抗失配134 Intermittent fillet weld 间断角缝焊接135 Loss of synchronism protection 失步保护136 Closing coil 合闸线圈137 Electro polarized relay 极化继电器139 Direct-to-ground capacity 对地电容140 Shunt running 潜动141 Trip/opening 跳闸142 Trip switch 跳闸

14、开关143 Receiver machine 收信机144 High-frequency direction finder 高频测向器145 Capacity charge 电容充电146 Time over-current 时限过电流148 Surge guard 冲击防护149 Oscillatory surge 振荡冲击150 Fail safe interlock 五防装置151 Differential motion 差动152 Capacitive current 电容电流154 Time delay 延时156 Normal inverse 反时限157 Definite tim

15、e 定时限158 Multi-zone relay 分段限时继电器159 Fail-safe unit 五防161 Unbalance current 不平衡电流162 Blocking autoreclose 闭锁重合闸164 Tap 分接头165 YC (telemetering) 遥测167 Fault clearing time 故障切除时间168 Critical clearing time 极限切除时间169 Switch station 开关站170 Traveling wave 行波171 Protection feature 保护特性172 Fault phase selec

16、tor 故障选线元件173 Fault type 故障类型174 Inrush 励磁涌流175 Ratio restrain 比率制动176 Laplace and Fourier transforms 拉氏和傅利叶变换177 Short circuit calculations 短路计算178 Load flow calculations 潮流计算179 Oscillatory reactivity perturbation 振荡反应性扰动180 Quasi-steady state 准稳态181 Automatic quasi-synchronization 自动准同步182 Protec

17、tive relaying equipment 继电保护装置183 AC directional overcurrent relay 交流方向过流继电器184 AC reclosing relay 交流重合闸继电器185 Annunciator relay 信号继电器188 Carrier or pilot-wire receiver relay 载波或导引线接受继电器190 Definite time relay 定时限继电器192 Lockout relay 闭锁继电器；保持继电器；出口继电器193 Micro-processor based protective relay 微机继电保护

18、194 Voltage -controlled overcurrent relay 电压控制过电流继电器196 Fault diagnosis 故障诊断197 Back-up protection 后备保护198 Overhead line 架空线199 High voltage line 高压线路200 Underground cable 埋地电缆201 Circuit breaker 断路器202 Brushless excitation 无刷励磁203 Interlock 闭锁204 Trigger 触发器205 Winding-to-winding insulation 绕组间的绝缘2

19、06 Porcelain insulator 瓷绝缘子207 Tie line 联络线208 Leased line 租用线路209 Private line 专用线路211 Remote Terminal Unit 远程终端设备212 Economic dispatch system 经济调度系统213 State estimation 状态估计214 Trip by local protection 保护跳闸215 Close by local protection 保护合闸216 Operational (internal) overvoltage 操作(内部)过电压217 Sampli

20、ng and holding 采样保持218 Synchronized sampling 采样同步219 Manipulation 操作220 Measuring/Metering unit 测量元件221 Locus of measured impedance 测量阻抗轨迹222 Differential mode interference 差模干扰223 Output (executive) organ 出口(执行)元件224 Overcurrent relay with undervoltage supervision 低电压起动的过电流保护225 Low impedance busba

21、r protection 低阻抗母线保护228 Half-cycle integral algorithm 半周积分算法230 Coordination of relay settings 保护的整定配合231 Reach (setting) of protection 保护范围(定值)232 Coordination time interval 保护配合时间阶段233 Percentage differential relay 比率差动继电器234 Electromagnetic relay 电磁型继电器236 Instantaneous undervoltage protection wi

22、th current supervision 电流闭锁的电压速断保护237 Operating equation (criterion) 动作方程(判据)238 Operating characteristic 动作特性242 Branch coefficient 分支系数243 Power line carrier channel (PLC) 高频通道245 High speed signal acquisition system 高速数字信号采集系统246 Busbar protection with fixed circuit connection 固定联结式母线保护247 Fault

23、recorder 故障录波器248 Fault phase selection 故障选相249 Optoelectronic coupler 光电耦合器件251 Compensating voltage 补偿电压252 Polarized voltage 极化电压253 Memory circuit 记忆回路254 Unblocking signal 解除闭锁信号255 Power system splitting and reclosing 解列重合闸256 Connection with 90 degree 90 度接线257 Insulation supervision device 绝

24、缘监视258 Inrush exciting current of transformer 励磁涌流259 Two star connection scheme 两相星形接线方式260 Zero mode component of traveling wave 零模行波261 Inverse phase sequence protection 逆相序保护262 Offset impedance relay 偏移特性阻抗继电器263 Frequency response 频率响应264 Activate the breaker trip coil 起动断路器跳闸267 Slight （sever

25、e） gas protection 轻（重）瓦斯保护268 Human machine interface 人机对话接口270 Three phase one shot reclosure 三相一次重合闸271 Out-of-step 失步272 Accelerating protection for switching onto fault 重合于故障线路加速保护动作275 Abrupt signal analysis 突变信号分析276 Out flowing current 外汲电流277 False tripping 误动279 Turn to turn fault，inter tur

26、n faults 匝间短路280 Relay based on incremental quantity 增量（突变量）继电器281 Vacuum circuit breaker 真空开关282 Power swing （out of step） blocking 振荡（失步）闭锁284 Successive approximation type A/D 逐次逼进式 A/D285 Infeed current 助增电流286 Self reset 自动复归287 Adaptive segregated directional current differential protection 自适

27、应分相方向纵差保护288 Adaptive relay protection 自适应继电保护289 Pilot protection 纵联保护291 Angle of maximum sensitivity 最大灵敏角292 Out of service 退出运行294 Waveform 波形295 Outlet 出口296 Electromechanical 机电的297 Magnitude of current 电流幅值299 Traveling wave signal 行波信号300 Measurement signal 测量信号301 Traveling wave relay 行波继电

28、器302 Transmission line malfunction 输电线路异常运行303 Subsystem 子系统304 Positive sequence impedance 正序阻抗305 Negative sequence impedance 负序阻抗306 Zero sequence impedance 零序阻抗307 Digital signal processor 数字信号处理器308 Frequency sensing 频率测量309 Cable relay 电缆继电器310 Under power protection 低功率保护311 Under voltage pro

29、tection 低电压保护312 Transient analysis 暂态分析313 Voltage sensor 电压传感器314 Zero-sequence protection 零序保护315 Zero sequence current transducer 零序电流互感器316 Shunt 旁路，并联317 Series 串联，级数318 Parallel 并联319 Saturation 饱和320 Free-standing 独立的，无需支撑物的321 Troidal 环形的，曲面，螺旋管形322 Bushing 套管323 Magnetizing 磁化324 Dropout c

30、urrent 回动电流325 Reactor grounded neutral system 中性点电抗接地系统326 Grounding apparatus 接地装置327 Dual bus 双总线328 Thyristor 晶闸管329 Spark gap 火花隙330 Damping circuit 阻尼电路331 Discharge 放电332 Platform 平台333 Grading 等级334 Line trap 线路陷波器335 Field test 实地试验337 Off-position “断开”位置，“开路”位置338 Power-angle 功角339 Power-a

31、ngle curve 功角特性曲线340 Torque-angle 转矩角342 Constant 常量，恒定343 Coupler 耦合器345 Concussion 震动348 Filter 滤波器349 Analogue 模拟350 Insulator 绝缘子351 Switch cabinet 开关柜352 Rated burdenload 额定负载353 Primary 一次侧的354 Remote-control apparatus 远距离控制设备355 Capacitance 电容356 Capacitor 电容器357 Reactance 电抗358 Inductor 电感35

32、9 Internal resistance 内阻360 Blow-out coil 消弧线圈361 Bundle-conductor spacer 分裂导线362 Bundle factor 分裂系数363 Electromotive force 电动势364 Volt-ampere characteristic 伏安特性365 Outgoing line 引出线366 Electrolyte 电解质368 Load characteristic 负载特性369 Self-induction 自感370 Mutual-induction 互感371 Induction coefficient

33、感应系数372 Inductance coupling 电感耦合373 Time-invariant 时不变的374 Terminal voltage 端电压375 Non-linear characteristics 非线性特性376 External characteristics 外特性378 Harmonic current 正弦电流379 Pole-pairs 极对数380 Quadrature 正交381 Angular velocity 角频率382 Magnetic induction 磁感应强度385 Armature 电枢386 Peak value （交变量的）最大值38

34、7 Amutually induced e.m.f 互感电动势388 The applied voltage 外施电压389 Zero-power-factor 零功率因数390 The no-load power factor 空载功率因数391 Sinusoidal variations 正弦变量392 Alagging power factor 滞后的功率因数393 Equivalent circuit 等值电路394 Capacitance effect 电容效应395 Direct axis 直轴396 Quadrature axis 交轴398 Concentrated coil

35、集中绕组399 Magnetization curve 磁化曲线400 Residual magnetism 剩磁401 Rated armature current 额定电枢电流402 Series excited 串励403 Self excited 自励404 Shunt excited 并励405 spottily excited 他励407 Electromagnetic torque 电磁转矩408 a retarding torque 制动转矩409 Rectangular wave 矩形波410 Synchronous speed 同步转速411 Electromagnetic

36、 brake 电磁制动412 Synchronous reactance 同步电抗413 synchronous condenser 同步调相机414 Load shedding 甩负荷415 Black-start 黑启动417 Distribution feeder 配电馈线418 Commissioning 投运419 Reactive power compensation 无功补偿器420 Continuous rating 连续运行的额定值421 AI (artificial intelligence) 人工智能422 Network topology 网络拓补424 Configu

37、ration control 组态控制425 Topological information 拓补信息426 Black-out area 停电区428 Adaptive relaying 自适应继电保护429 Adaptive features 自适应特性430 Phase comparison relays 相位比较继电器431 Directional contact 方向触点432 Protective gap 保护间隙433 Protective earthing 保护接地434 Protective earthing; outer insulation 保护绝缘435 Protect

38、ion switch 保护开关436 Protective cap 保护帽437 Protective panel 保护屏柜439 Protection device 保护设备440 Protective casing 保护外壳441 Catch net; protecting net 保护网442 Protection system 保护系统443 Protective link 保护线路444 Protective ground 保护性接地445 Protective cover; Protective housing 保护罩446 Protection device; Protectiv

39、e gear 保护装置447 Protective transformer 保护变压器448 Alarm relay 报警信号继电器449 Alarm signal； alerting signal 报警信号450 Admittance relays 导纳型继电保护装置451 Low-voltage protection 低压保护452 Under-voltage release 低电压跳闸453 Under-voltage trip 低电压自动跳闸454 Under-run 低负荷运行455 Under-power protection 低功率保护456 Under-power relay

40、低功率继电器457 Under-frequency protection 低频保护458 Low-frequency high-voltage test 低频高压实验459 Low-voltage relay 低压继电器460 Low-voltage release relay 低压释放继电器461 Under-frequency protection 低周波保护463 Under-impedance relay 低阻抗继电器465 Conductance relay 电导继电器467 Dynamoelectric relay 电动式继电器468 Electric reset relay 电复

41、位继电器469 Power-transformer relay 电力传输继电器471 Power system oscillation 电力系统振荡472 Electric interlock relay 连锁继电器473 Current overload 电流过载474 Self-polarizing relay 电流极化继电器475 Current-balance relay 电流平衡式继电器476 Circuit control relay 电路控制继电器479 Capacitance relay 电容继电器480 Capacity ground 电容接地481 Voltage bala

42、nce relay 电压平衡继电器482 Circuit control relay 电路控制继电器483 Voltage responsive relay 电压响应继电器484 Voltage selection relay 电压选择继电器485 Power failure 电源故障486 Power-transfer relay 电源切换继电器487 vacuum-tube relay 电子管继电器488 Ohm relay 电阻继电器489 Timing relay; timed relay 定时继电器490 Time pulse relay 定时脉冲继电器493 Directional

43、 over-current protection 方向过流保护494 Directional distance relay 方向距离继电器495 Directional pilot relaying 方向纵联继电保护497 Cut-off relay 断路继电器498 Circuit breaker failure protection 断路器故障保护装置500 Open-phase relay 断相继电器501 Earth-leakage protection 对地漏电保护502 Multiple-reclosing breaker 多次重合闸断路器503 Multi-ended circu

44、it protection 多端线路保护506 Multiple earth 多重接地507 Two-position relay 二位置继电器508 Generator protection 发电机保护509 Generator cutout relay 发电机断路继电器510 Generator protection for negative sequence current 发电机负序电流保护511 Transmitting relay 发送继电器512 Back-spin timer 反转时间继电器513 Auxiliary relay 辅助继电器514 Negative phase

45、relay 负相位继电器515 Negative-phase sequence impendence 负相序继电器516 Under-load relay 负载不足继电器517 Back-up over-speed governor 附加超速保护装置520 Induction type relay 感应式继电器521 Induction disc relay 感应圆盘式继电器522 High sensitive relay 高灵敏度继电器523 High-speed impedance relay 高速阻抗继电器524 High-voltage relay 高压继电器525 Power rel

46、ay 功率继电器527 Transition impedance 过渡阻抗528 Thermal protection 过热保护529 Temperature limiting relay 过热继电器530 Overload relay 过载继电器531 Overload trip 过载跳闸532 Thermostat relay 恒温继电器533 Closing relay 合闸继电器534 Transverse differential protection 横差保护535 Transfer of auxiliary supply 后备电源切换536 Back-up system 后备继电

47、保护537 Delay-action relay 缓动继电器538 Slow-to release relay 缓放继电器539 Converter relay 换流器继电器540 Electromechanical relay 机电继电器541 Biased differential relaying 极化差动继电保护系统543 Transistor relay 晶体管继电器544 Crystal can relay 晶体密闭继电器545 Static relay 静电继电器546 Fast-operate slow-release relay 快动缓释继电器547 Fast-release

48、 relay 快释放继电器549 Excitation-loss relay 失磁继电器553 Two-phase short circuit fault 两相短路故障554 Two-phase grounding fault 两相接地短路故障556 Sensitive polarized relay 灵敏极化继电器558 Sensitive relay 灵敏继电器560 Abnormal overload 异常过载561 Abnormal overvoltage 事故过电压562 Above earth potential 对地电势563 Absolute potential 绝对电势564

49、 AC circuit breaker 交流断路器565 AC component 交流分量566 AC distribution system 交流配电系统567 Air-blast circuit breaker 空气灭弧断路器568 Air-blast switch 空气吹弧开关569 Air brake switch 空气制动开关571 Air breaker 空气断路器572 Air-space cable 空气绝缘电缆573 Alive 带电的574 All-relay interlocking 全部继电连锁575 All-relay selector 全继电式选择器578 Arc

50、 extinguishing coil 灭弧线圈579 Arc suppressing reactor 灭弧电抗器580 Asymmetric load 不对称负载581 Asymmetric short circuit 不对称短路582 Asynchronous reactance 异步电抗583 Asynchronous resistance 异步电阻584 Biased differential relaying 极化差动继电保护系统585 Bi-directional relay 双向继电器586 Blinker 继电器吊牌587 Blocking relay 连锁继电器589 Blo

51、wout coil 灭弧线圈590 Bus hub 总线插座591 Bus protective relay 母线保护继电器592 Bus section breaker 母线分段断路器593 Bus terminal fault 母线终端故障594 Bus separation 母线分离595 Bus tie circuit breaker 母线联络继电器596 Bypass 旁路597 Coil factor 线圈系数598 Compound relay 复合电路599 Continuous load 持续负载600 Counting relay 计数继电器602 Cut-off of s

52、upply 停止供电603 Cut-out relay 短路继电器604 Dash current 冲击电流605 Data medium 数据载体606 Data processing 数据处理607 Data transmission 数据传输608 Emergency service 事故运行609 Emergency standby 事故备用611 Extinction coil 消弧线圈612 Extinguishing voltage 消弧线圈613 Extra high voltage 超高压614 Fault line 故障线615 Fault location 故障定位616

53、 Feedback 反馈617 Feeder 馈电线618 Interlock 连锁619 Intermittent fault 间歇故障620 Interrupting time 断路时间621 Negative direction 反方向622 No-load release 无跳闸623 Off-peak 非峰值的624 Operating load 运行负载625 Orthogonal 正交的626 Rated primary voltage 一次额定电压627 Rated secondary voltage 二次额定电压628 Remote controlled 遥控的629 Res

54、erve bus 备用母线630 Rotor 转子631 Sectionalizer 分段断路器632 Self-energizing 自激的633 Sequential tripping 顺序跳闸637 Surge voltage 冲击电压638 Sustained overload 持续过电压639 Symmetrical 对称的640 Fault component 故障分量641 Wavelet transform 小波变换642 Object-oriented 面向对象643 Faults recorder 故障录波644 Setting calculation 整定计算646 Ex

55、pert system 专家系统647 Security 安全性651 Load schedule according to frequency change 按周波减载653 Semiconductor, semiconductor diode, transistor 半导体、半导体二级管、三极管654 Semi-orthogonal wavelet 半正交小波656 Saturation, saturation detection, saturation curve 饱和，饱和检测，饱和曲线657 Relay location 保护安装处658 Coordination of relay

56、settings 保护的整定配合659 Coordination time interval 保护配合时间阶段660 Relay system configuration 保护配置661 Redundancy of relaying system 保护配置的冗余度663 Protection devices, protection equipment 保护装置664 Starting current and returning current of protection device 保护装置的起动电流和返回电流665 Alarm 报警666 Approximation component 逼

57、近分量668 B sampling function B 样条函数670 Transformation matrix 变换矩阵672 Fault type 故障类别673 Pockels effect 波克尔斯效应674 Wave propagation velocity 波速675 Waveform identification 波形识别法676 Wave impedance, surge impedance 波阻抗678 Compensation theorem, compensation principle 补偿原理679 Unavailability, failure rate 不可用

58、率，失效率680 Immune to electromagnetic interference 不受电磁干扰681 Abnormal operating condition 不正常运行状态682 Sampling interruption service program 采样中断服务程序683 Synchronizing by reference parameter vector 参数矢量同步法684 Operational (internal) over voltage 操作(内部)过电压685 Manipulating organ 操作单元686 Measurement， measurin

59、g unit 测量，测量单元687 Measured impedance 测量阻抗688 Locus of measured impedance 测量阻抗轨迹689 Differential relay 差动继电器690 Differential mode interference 差模干扰691 Distributed capacitance of long line 长线分布电容692 Normally closed contacts 常闭节点693 Normally open contacts 常开节点694 Over reach blocking scheme 超范围闭锁式696 Ex

60、tra-high-voltage transmission line 超高压传输697 Sustained faults 持续性故障698 Output (executive) organ 出口(执行)元件699 Contact 触点、接点700 Capacitor of series compensation 串补电容701 Window function 窗函数702 Differential relay with fast saturated current transformer 带有速饱和变流器的差动继电器703 Single-chip microcontroller 单片机704

61、Single-phase(three phase) transmission line 单相(三相)传输线705 Unit protection 单元式保护707 Low frequency component, subharmonic 低频分量，低次谐波708 Low impedance bus bar protection 低阻抗母线保护709 Current traveling wave 电流行波710 Electrical apparatus, equipments 电器设备711 Electrical network, power network 电网712 Voltage wave

62、form distortion 电压波形崎变713 Voltage traveling wave 电压行波714 Operating time 动作时间715 Multiphase compensated impedance relay 多相补偿式阻抗继电器716 Generator, generator-transformer set 发电机，发电机变压器组717 Protection of generator-transformer set 发电机变压器保护718 Field failure protection of generator 发电机的失磁保护720 Metallic fault 金属性故障721 Transistor type relay 晶体管型继电器723 Differential protection with percentage restraining 具有比率制动的差动继电器724 Pilot protection using distance relay 距离