SAM11230F440 PLC模块卡件
接地故障
概述接地故障保护基于编码信号的注入。所得偏移电压用于计算接地电阻（Rf）。注入信号在注入单元REX010中产生，并通过变压器单元REX011施加到发电机。为了耦合到受保护的单元电阻器（RE、RP）。对于转子接地故障保护，还需要两个电容器。接地故障保护的测量信号分别由REG216或REG316*4处理。所述设备100%保护发电机定子绕组。应用了两个独立的保护功能：一个用于95%，另一个使用不同的算法用于100%的定子绕组。100%功能用于计算接地电阻，95%功能用于测量发电机的中性电压位移。a） 当Rf=0且I0max=15 a时，100%功能保护35%的定子绕组不受中性点的影响b）95%功能（U>）保护95%的发电机定子绕组不受到端子的影响。这导致两个保护功能重叠（冗余），如图1所示。100%功能的灵敏度随着接地故障电阻的增加和接地故障电流的减少而增加。
变压器
静止时，整个定子绕组（100%）受到100%功能的保护，如图2所示。同时，整个励磁绕组受到接地故障保护。由于REX010/011具有良好的外部干扰抑制能力，可应用于所有类型的励磁系统，包括晶闸管型。图2硬件保护设备包括以下装置（图4-8）：REG216/316*4：数字发电机保护REX010：注入装置REX011：带辅助接触器的注入变压器装置此外，还需要以下部件：发电机中性点（RE、RP）和励磁电路（REr、RPr）中的接地电阻器转子励磁电路-电压互感器注入装置（REX010）和注入变压器（REX011）产生三个频率为fN/4的编码方波信号（Uis、Uir、Ui）。这些方波信号通过耦合组件注入受保护对象。三个方波具有不同的振幅：Uis（定子注入信号）、Uir（转子注入信号）和Ui（REG216/316*4的参考信号）。喷射单元REX010连接至电站电池，喷射信号电压由电池或内部DC/DC转换器产生。
Ground fault
Overview The ground fault protection is based on the injection of coded signals. The resulting offset voltage is used to calculate the ground resistance (Rf). The injection signal is generated in the injection unit REX010 and applied to the generator through the transformer unit REX011. To couple to the protected unit resistors (RE, RP). For rotor ground fault protection, two capacitors are also required. The measuring signals of ground fault protection are processed by REG216 or REG316 * 4 respectively. The equipment protects 100% of the generator stator windings. Two independent protection functions are applied: one for 95% and the other for 100% stator windings using different algorithms. The 100% function is used to calculate the grounding resistance, and the 95% function is used to measure the neutral voltage displacement of the generator. a) When Rf=0 and I0max=15a, 100% function protection protects 35% of the stator windings from the neutral point b) 95% function (U>) protects 95% of the generator stator windings from the terminal. This results in two protection functions overlapping (redundancy), as shown in Figure 1. The sensitivity of 100% function increases with the increase of ground fault resistance and the decrease of ground fault current.
transformer
At standstill, the entire stator winding (100%) is protected by 100% function, as shown in Figure 2. At the same time, the whole excitation winding is protected against ground fault. As REX010/011 has good external interference suppression capability, it can be applied to all types of excitation systems, including thyristor type. Fig. 2 Hardware protection equipment includes the following devices (Fig. 4-8): REG216/316 * 4: digital generator protection REX010: injection device REX011: injection transformer device with auxiliary contactor, The following components are also required: grounding resistors in the generator neutral (RE, RP) and excitation circuits (REr, RPr) Rotor excitation circuit - Voltage transformer injection device (REX010) and injection transformer (REX011) generate three coded square wave signals (Uis, Uir, Ui) with a frequency of fN/4. These square wave signals are injected into the protected object through the coupling component. The three square waves have different amplitudes: Uis (stator injection signal), Uir (rotor injection signal) and Ui (reference signal of REG216/316 * 4). The injection unit REX010 is connected to the battery of the power station, and the injection signal voltage is generated by the battery or the internal DC/DC converter.
