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BALDOR BC30D7A35-CL7终端PLC系统
过频保护功能SAPTOF适用于所有需要可靠检测高基波电力系统频率的情况。电网中的负载突然下降或并联故障会导致频率过高。靠近发电厂的发电机调速器问题也会导致频率过高。SAPTOF主要用于发电削减和补救措施方案。它还用作启动负载恢复的频率级。SAPTOF配有欠压闭锁。该操作基于正序电压测量，需要连接两相或三相中性点电压。有关如何连接模拟输入的信息，请参阅应用手册/IED应用程序/模拟输入/设置指南频率变化率保护SAPFRC频率变化率防护功能（SAPFRC）提供系统中主要干扰的早期指示。SAPFRC可用于发电削减、负荷削减和补救措施方案。SAPFRC可以区分频率的正负变化。SAPFRC配有欠压闭锁。该操作基于正序电压测量，需要连接两相或三相中性点电压。有关如何连接模拟输入的信息，请参阅应用手册/IED应用/模拟输入/设置指南。
通用电流和电压保护CVGAPC
由于保护模块具有灵活的测量和设置设施，建议将其作为一种通用的后备保护，具有许多可能的应用领域。内置过电流保护功能有两个可设置的电流水平。这两种方法都可以用于定时或反时特性。过电流保护步骤可以通过可选择的电压极化量进行定向。此外，它们可以是电压和/或电流控制/限制的。还提供二次谐波抑制设施。极化电压过低时，过电流特性可以被阻断、非定向或根据参数设置命令使用电压存储器。此外，每个功能中有两个过压和两个欠压步骤，具有定时或反时特性。一般功能适用于低阻抗和电压控制过电流解决方案的应用。一般功能也可用于发电机变压器保护应用，其中通常需要电流和电压的正序、负序或零序分量。此外，发电机应用，如失磁、意外通电、定子或转子过载、断路器头部闪络和断相检测，只是这些功能的少数可能保护装置。转子接地故障保护励磁绕组，包括转子绕组和非旋转励磁设备，始终与转子的金属部件绝缘。如果转子由空气或氢气冷却，则绝缘电阻较高。如果转子绕组用水冷却，绝缘电阻要低得多。即使绝缘层完好无损，情况也是如此。磁场电路的绝缘故障将导致磁场绕组与接地之间的导电路径。这意味着故障已导致现场接地故障。
Overfrequency protection SAPTOF
Overfrequency protection function SAPTOF is applicable in all situations, where reliable detection of high fundamental power system frequency is needed. Overfrequency occurs because of sudden load drops or shunt faults in the power network. Close to the generating plant, generator governor problems can also cause over frequency. SAPTOF is used mainly for generation shedding and remedial action schemes. It is also used as a frequency stage initiating load restoring. SAPTOF is provided with an undervoltage blocking. The operation is based on positive sequence voltage measurement and requires two phase-phase or three phaseneutral voltages to be connected. For information about how to connect analog inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines Rate-of-change frequency protection SAPFRC Rate-of-change frequency protection function (SAPFRC) gives an early indication of a main disturbance in the system. SAPFRC can be used for generation shedding, load shedding and remedial action schemes. SAPFRC can discriminate between positive or negative change of frequency. SAPFRC is provided with an undervoltage blocking. The operation is based on positive sequence voltage measurement and requires two phase-phase or three phase neutral voltages to be connected. For information about how to connect analog inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines.
General current and voltage protection CVGAPC
The protection module is recommended as a general backup protection with many possible application areas due to its flexible measuring and setting facilities. The built-in overcurrent protection feature has two settable current levels. Both of them can be used either with definite time or inverse time characteristic. The overcurrent protection steps can be made directional with selectable voltage polarizing quantity. Additionally they can be voltage and/or current controlled/restrained. 2nd harmonic restraining facility is available as well. At too low polarizing voltage the overcurrent feature can be either blocked, made non directional or ordered to use voltage memory in accordance with a parameter setting. Additionally two overvoltage and two undervoltage steps, either with definite time or inverse time characteristic, are available within each function. The general function suits applications with underimpedance and voltage controlled overcurrent solutions. The general function can also be utilized for generator transformer protection applications where positive, negative or zero sequence components of current and voltage quantities are typically required. Additionally, generator applications such as loss of field, inadvertent energizing, stator or rotor overload, circuit breaker head flash-over and open phase detection are just a few of possible protection arrangements with these functions. Rotor earth fault protection The field winding, including the rotor winding and the nonrotating excitation equipment, is always insulated from the metallic parts of the rotor. The insulation resistance is high if the rotor is cooled by air or by hydrogen. The insulation resistance is much lower if the rotor winding is cooled by water. This is true even if the insulation is intact. A fault in the insulation of the field circuit will result in a conducting path from the field winding to earth. This means that the fault has caused a field earth fault.
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