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Benshaw BIPC-300016-01中压脉冲卡
灵敏转子接地故障保护基于注入的ROTIPHIZ灵敏转子接地故障保护（ROTIPHI）用于检测发电机转子绕组中的接地故障。ROTIPHIZ适用于所有类型的同步发电机。为了实现上述概念，需要一个单独的注射箱。注射箱以特定的预设频率产生方波电压信号，该信号被送入转子绕组。注入电压信号的大小和产生的注入电流通过位于注入箱内的电阻分流器测量。这两个测量值被输入IED。根据这两个测量值，保护IED确定转子绕组对地电阻。然后将电阻值与预设故障电阻报警和跳闸水平进行比较。保护功能可以检测整个转子绕组和相关连接中的接地故障。需要注入装置REX060和耦合电容器装置REX06才能正确运行。100%定子接地故障保护，基于注入的STTIPHIZ 100%定子接地线故障保护STTIPHI用于检测发电机和电机定子绕组中的接地故障。STTIPHIZ适用于通过块连接的单元变压器连接到电力系统的发电机。一个与发电机额定频率不同的特定频率的独立信号被注入定子电路。该注入信号的响应用于检测定子接地故障。为了实现上述概念，需要一个单独的注射箱。注入箱产生方波电压信号，例如可以馈入发电机中性点电压互感器或接地变压器的二次绕组。该信号通过变压器传播到定子电路
注入电压信号的幅值
在中性点电压互感器或接地变压器的二次侧测量。此外，产生的注入电流通过位于注入箱内的电阻分流器进行测量。这两个测量值被输入IED。根据这两个测量值，IED确定定子绕组对地电阻。然后将电阻值与预设故障电阻报警和跳闸水平进行比较。保护功能不仅可以检测发电机星点处的接地故障，还可以检测定子绕组和发电机端子处的接地线故障，包括电压互感器、断路器、励磁变压器等连接部件。所使用的测量原理不受发电机运行模式的影响，即使发电机处于静止状态，也能充分发挥作用。仍然需要基于中性点基频位移电压的标准95%定子接地故障保护，与100%定子接地保护功能并联运行。需要注入装置REX060和可选并联电阻装置REX06才能正常工作。5.电流保护瞬时相过电流保护PHPIOC瞬时三相过电流功能具有较低的瞬时过电流和较短的跳闸时间，允许用作高设置短路保护功能。四步相过流保护OC4PTOC四步相过流保护功能OC4PTOC具有独立于步骤1和4的反时限或定时限延时。第2步和第3步总是定时延迟。所有IEC和ANSI反时限特性与可选的用户定义时间特性一起可用。定向功能是通过记忆电压极化的。对于每个步骤，可以单独将功能设置为定向或非定向。
Sensitive rotor earth fault protection
injection based ROTIPHIZ The sensitive rotor earth fault protection (ROTIPHIZ) is used to detect earth faults in the rotor windings of generators. ROTIPHIZ is applicable for all types of synchronous generators. To implement the above concept, a separate injection box is required. The injection box generates a square wave voltage signal at a certain preset frequency which is fed into the rotor winding. The magnitude of the injected voltage signal and the resulting injected current is measured through a resistive shunt located within the injection box. These two measured values are fed to the IED. Based on these two measured quantities, the protection IED determines the rotor winding resistance to ground. The resistance value is then compared with the preset fault resistance alarm and trip levels. The protection function can detect earth faults in the entire rotor winding and associated connections. Requires injection unit REX060 and a coupling capacitor unit REX061 for correct operation. 100% stator earth fault protection, injection based STTIPHIZ The 100% stator earth-fault protection STTIPHIZ is used to detect earth faults in the stator windings of generators and motors. STTIPHIZ is applicable for generators connected to the power system through a unit transformer in a block connection. An independent signal with a certain frequency different from the generator rated frequency is injected into the stator circuit. The responce of this injected signal is used to detect stator earth faults. To implement the above concept, a separate injection box is required. The injection box generates a square wave voltage signal which for example can be fed into the secondary winding of the generator neutral point voltage transformer or grounding transformer. This signal propagates through this transformer into the stator circuit
The magnitude of the injected voltage signal
is measured on the secondary side of the neutral point voltage transformer or grounding transformer. In addition, the resulting injected current is measured through a resistive shunt located within the injection box. These two measured values are fed to the IED. Based on these two measured quantities, the IED determines the stator winding resistance to ground. The resistance value is then compared with the preset fault resistance alarm and trip levels. The protection function can not only detect the earth fault at the generator star point, but also along the stator windings and at the generator terminals, including the connected components such as voltage transformers, circuit breakers, excitation transformer and so on. The measuring principle used is not influenced by the generator operating mode and is fully functional even with the generator at standstill. It is still required to have a standard 95% stator earth-fault protection, based on the neutral point fundamental frequency displacement voltage, operating in parallel with the 100% stator earth-fault protection function. Requires injection unit REX060 and optional shunt resistor unit REX062 for correct operation. 5. Current protection Instantaneous phase overcurrent protection PHPIOC The instantaneous three phase overcurrent function has a low transient overreach and short tripping time to allow use as a high set short-circuit protection function. Four step phase overcurrent protection OC4PTOC The four step phase overcurrent protection function OC4PTOC has an inverse or definite time delay independent for step 1 and 4 separately. Step 2 and 3 are always definite time delayed.All IEC and ANSI inverse time characteristics are available together with an optional user defined time characteristic. The directional function is voltage polarized with memory. The function can be set to be directional or non-directional independently for each of the steps.
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