IS200HSLAH2ADE工控备件机器人模块
发电机系统。根据拾取电压设置，区域1使用基频中性过电压覆盖约95%的定子绕组。区域2基于将发电机中性点处的三次谐波电压与产生的总三次谐波电流进行比较。该功能设计用于覆盖定子绕组中性端的15%，并由基波和三次谐波电压阈值控制。这两个区域一起覆盖100%的定子绕组。或者，区域1可以用作高阻抗接地或不接地系统中的发电机母线接地检测器。DGP使用两个重叠区域来检测定子接地故障。失磁当同步发电机失磁时，它作为感应发电机：以高于正常速度运行，以DGP数字发电机保护2运行www.GEindustr.com/Multilin 3功能框图704750A8.CDR至调制解调器至笔记本电脑跳闸报警52G GSU变压器。至电力系统GEN.51GN 64G1 64G2 27TN RS232 46 87G 40 32 51V VTFF RS232 64G2 24 32 40 27 59 81 VTFF DGP 51V 87S发电机差动46电流不平衡40失磁32防电动51V TOC带电压限制64G 100%定子接地51GNP定子接地过流27TN三次谐波中性欠压24过励磁59过电压27P欠压81过和欠频50/27意外通电VTFF电压互感器保险丝故障装置保护95%15%704757A3.CDR中性端终端区域1（64G1）区域2（64G2）功率降低，并从系统接收其励磁（vars）。DGP的失磁功能包括两个mho特性，分别具有可调节的范围、偏移和时间延迟。如果DGP检测到指示VTFF或外部VTFF信号的负序电压，DGP将阻止此功能。可以设置第一区域mho功能，以检测具有短时间延迟的严重励磁故障情况。第二区域mho功能可设置为检测所有具有较长时间延迟设置的励磁故障情况。这允许在稳定的电力系统摆动条件下实现系统安全。过励磁保护通过具有反向和瞬时延时特性的伏特/赫兹功能提供。过励磁保护包括为每个三相电压计算的跳闸和报警功能。跳闸功能包含用户可配置的线性重置特性，以模拟机器冷却。过电压和欠电压欠电压功能由正序欠电压和用户可选择的逆或定时间特性组成。过电压功能由具有反向特性的正序过电压组成。两种功能都包含线性复位特性。过电压功能可用作过励磁的备用。欠压功能还提供电压反相保护。过频和欠频最多包括四个保护步骤，每个步骤都具有可调整的时间延迟。这些步骤由可调节的正序电压电平控制。电压互感器保险丝故障（VTFF）当检测到保险丝故障时，DGP将关闭
generator system. Zone 1 uses a fundamental frequency neutral overvoltage to cover about 95% of the stator winding, based on the pickup voltage setting. Zone 2 is based on comparing the third harmonic voltage at the generator neutral with the total third harmonic voltage generated. This function is designed to cover 15% of the neutral end of the stator windings, and is controlled by fundamental and third harmonic voltage thresholds. Together the two zones cover 100% of the stator windings. Alternatively, Zone 1 can be used as a generator-bus ground detector in a high-impedance grounded or ungrounded system. The DGP uses two overlapping zones to detect stator ground faults. Loss of Excitation When a synchronous generator loses excitation, it acts as an induction generator: running above normal speed, operating at DGP Digital Generator Protection 2 www.GEindustrial.com/Multilin 3 Functional Block Diagram 704750A8.CDR To MODEM To LAPTOP PC TRIP ALARM 52G GSU Transf. TO POWER SYSTEM GEN. 51GN 64G1 64G2 27TN RS232 46 87G 40 32 51V VTFF RS232 64G2 24 32 40 27 59 81 VTFF DGP 51V 87S Generator differential 46 Current unbalance 40 Loss of excitation 32 Anti-motoring 51V TOC with voltage restraint 64G 100% stator ground 51GNP Stator ground overcurrent 27TN 3rd harmonic neutral undervoltage 24 Overexcitation 59 Overvoltage 27P Undervoltage 81 Over and underfrequency 50/27 Accidental energization VTFF Voltage transformer fuse failure DEVICE PROTECTION 95% 15% 704757A3.CDR Neutral end Terminal end Zone 1 (64G1) Zone 2 (64G2) reduced power, and receiving its excitation (vars) from the system. The DGP’s loss of excitation function includes two mho characteristics featuring individually adjustable reach, offset, and time delay. The DGP will block this function if it detects a negative sequence voltage, which would indicate a VTFF, or an external VTFF signal. The first zone mho function can be set to detect severe cases of excitation failure with a short time delay. The second zone mho function can be set to detect all the excitation failure cases with a longer time delay setting. This permits system security during stable power system swing conditions. Overexcitation Protection Provided through a Volts/Hertz function with inverse and instantaneous time delay characteristics. The overexcitation protection includes trip and alarm functions computed for each of the threephase voltages. The trip function incorporates a user-configurable linear reset characteristic to mimic machine cooling. Over and Undervoltage The undervoltage function consists of a positive sequence undervoltage with a userselectable inverse or definite time characteristic. The overvoltage function consists of a positive sequence overvoltage with an inverse characteristic. A linear reset characteristic is incorporated for both functions. The overvoltage function can be used as a backup to the overexcitation. The undervoltage function also provides voltage phase reversal protection. Over and Underfrequency Up to four steps of protection are included, each with an adjustable time delay. The steps are controlled by an adjustable positive sequence voltage level. Voltage Transformer Fuse Failure (VTFF) When a fuse failure is detected, the DGP will block
