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BALDOR BC29D7A35-CO7驱动控制器
同步发电机的励磁电路通常不接地。
因此，励磁绕组上的单个接地故障只会导致非常小的故障电流。因此，接地故障不会对发电机造成任何损坏。此外，它不会以任何方式影响发电机组的运行。然而，单个接地故障的存在会增加励磁电路中其他点的电应力。这意味着磁场绕组另一点发生第二次接地故障的风险大大增加。第二次接地故障将导致磁场短路，并造成严重后果。转子接地故障保护基于向隔离磁场电路注入交流电压。在非故障条件下，不会有与此注入电压相关的电流。如果发生转子接地故障，转子接地保护将检测到这种情况。根据发电机所有者的理念，此操作状态将报警和/或发电机将跳闸。转子接地故障保护（RXTTE4）需要一个注入装置，板上需要一个保护电阻器才能正常工作。9.二次系统监督电流电路监督CCSRDIF电流互感器铁芯开路或短路会导致许多保护功能不必要地运行，例如差动、接地故障电流和负序电流功能。必须记住，CT电路开路时保护功能的阻塞将意味着这种情况将继续存在，极高的电压将给二次电路带来压力。电流电路监控（CCSRDIF）将来自三相电流互感器铁芯组的残余电流与来自电流互感器另一组铁芯的单独输入上的中性点电流进行比较。检测到差异表明电路中存在故障，并用作报警或阻止预期会导致不必要跳闸的保护功能。
保险丝故障监控SDDRFUF
熔断器故障监测功能（SDDRFUF）的目的是在电压互感器和IED之间的二次电路发生故障时阻断电压测量功能，以避免可能发生的不必要操作。熔断器故障监控功能基本上有三种不同的算法，基于负序和零序的算法，以及额外的电压和电流增量算法。建议对隔离或高阻抗接地网络中使用的IED使用负序检测算法。它基于负序测量量，在不存在负序电流3I2的情况下，高电压值3U2。建议对直接或低阻抗接地网络中使用的IED使用零序检测算法。它基于零序测量量，在不存在剩余电流3I0的情况下，电压3U0的高值。为了更好地适应系统要求，引入了一种操作模式设置，使得可以为负序和基于零序的功能选择操作条件。通过选择不同的操作模式，可以在负序和零序算法之间选择不同的交互可能性。可将基于电流增量和电压增量测量的标准添加到熔断器故障监测功能中，以检测三相熔断器故障，实际上，三相熔断器的故障与电站运行期间的电压互感器切换更为相关。
The field circuit of a synchronous generator is normally unearthed.
Therefore, a single earth fault on the field winding will cause only a very small fault current. Thus the earth fault does not produce any damage in the generator. Furthermore, it will not affect the operation of a generating unit in any way. However, the existence of a single earth fault increases the electric stress at other points in the field circuit. This means that the risk for a second earth fault at another point on the field winding has increased considerably. A second earth fault will cause a field short-circuit with severe consequences. The rotor earth fault protection is based on injection of an AC voltage to the isolated field circuit. In non-faulted conditions there will be no current flow associated to this injected voltage. If a rotor earth fault occurs, this condition will be detected by the rotor earth fault protection. Depending on the generator owner philosophy this operational state will be alarmed and/or the generator will be tripped. An injection unit is required for rotor earth fault protection (RXTTE4) and a protective resistor on plate for correct operation. 9. Secondary system supervision Current circuit supervision CCSRDIF Open or short circuited current transformer cores can cause unwanted operation of many protection functions such as differential, earth-fault current and negative-sequence current functions. It must be remembered that a blocking of protection functions at an occurrence of open CT circuit will mean that the situation will remain and extremely high voltages will stress the secondary circuit. Current circuit supervision (CCSRDIF) compares the residual current from a three phase set of current transformer cores with the neutral point current on a separate input taken from another set of cores on the current transformer. A detection of a difference indicates a fault in the circuit and is used as alarm or to block protection functions expected to give unwanted tripping.
Fuse failure supervision SDDRFUF
The aim of the fuse failure supervision function (SDDRFUF) is to block voltage measuring functions at failures in the secondary circuits between the voltage transformer and the IED in order to avoid unwanted operations that otherwise might occur. The fuse failure supervision function basically has three different algorithms, negative sequence and zero sequence based algorithms and an additional delta voltage and delta current algorithm. The negative sequence detection algorithm is recommended for IEDs used in isolated or high-impedance earthed networks. It is based on the negative-sequence measuring quantities, a high value of voltage 3U2 without the presence of the negative-sequence current 3I2. The zero sequence detection algorithm is recommended for IEDs used in directly or low impedance earthed networks. It is based on the zero sequence measuring quantities, a high value of voltage 3U0 without the presence of the residual current 3I0. For better adaptation to system requirements, an operation mode setting has been introduced which makes it possible to select the operating conditions for negative sequence and zero sequence based function. The selection of different operation modes makes it possible to choose different interaction possibilities between the negative sequence and zero sequence based algorithm. A criterion based on delta current and delta voltage measurements can be added to the fuse failure supervision function in order to detect a three phase fuse failure, which in practice is more associated with voltage transformer switching during station operations.
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