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CUTLER HAMMER BIM 7801C61G01输出控制器
热过载保护，双时间常数TRPTTR如果电力变压器或发电机达到非常高的温度，设备可能会损坏。变压器/发电机内的绝缘将强制老化。因此，内部相间短路或相间接地故障的风险将增加。高温会降低变压器/发电机的绝缘质量。热过载保护持续估计变压器/发电机的内部热含量（温度）。该估算是通过使用变压器/发电机的热模型进行的，该模型具有两个时间常数，基于电流测量。有两个警告级别可用。这样可以在达到危险温度之前在电力系统中采取行动。如果温度继续升高至跳闸值，保护装置将启动受保护变压器/发电机的跳闸。断路器故障保护CCRBRF断路器故障防护（CCRBRF）确保在自身断路器无法断开的情况下，周围断路器快速后备跳闸。CCRBRF可以基于电流、基于触点或这两种条件的自适应组合。重置时间极短的电流检查被用作检查标准，以实现高安全性，防止意外操作。当通过断路器的故障电流很小时，可以使用触点检查标准。CCRBRF可以是单相或三相启动，以允许与单相跳闸应用一起使用。对于三相版本的CCRBRF，仅当四取二（例如，两相或单相加剩余电流启动）时，才能将电流标准设置为运行。这为备用跳闸命令提供了更高的安全性。CCRBRF功能可编程为对自身断路器进行单相或三相重新跳闸，以避免因测试过程中的错误而导致周围断路器在错误启动时不必要地跳闸。
极不一致保护CCRPLD
断相可能会导致负序和零序电流，从而对旋转机器造成热应力，并可能导致零序或负序电流功能的不必要操作。通常，自身断路器跳闸以纠正这种情况。如果这种情况持续存在，应跳闸周围的断路器，以清除不对称负载情况。极化保护功能CCRPLD根据三相断路器辅助触点的信息运行，需要时根据不对称相电流的附加标准。定向过/欠功率保护GOPPDOP/GUPPDUP在需要高/低有功、无功或视在功率保护或警报的地方，可以使用定向过/功率不足保护GOPPDOP/GUPDDUP。这些功能还可用于检查电力系统中有功或无功功率流的方向。有许多应用程序需要此类功能。其中包括：•发电机反向功率保护•发电机正向低功率保护•检测过励磁/欠励磁发电机•检测反向有功潮流•检测高无功潮流•带有功或无功功率的过多线路/电缆负载•发电机反向功能保护每个功能有两个步骤，具有一定的延时。也可以设置两个步骤的重置时间。通过使用可选的计量级CT输入，汽轮机应用可达到0.5%的精度。机器NS2PTOC的负序时间过电流保护主要用于保护发电机，防止定子电流中的负序电流导致转子过热。发电机中的负序电流可能由以下原因引起：•不平衡负载•线对线故障•线对地故障•导线断裂•断路器或隔离开关的一个或多个极故障
Thermal overload protection, two time constant TRPTTR
If a power transformer or generator reaches very high temperatures the equipment might be damaged. The insulation within the transformer/generator will have forced ageing. As a consequence of this the risk of internal phase-tophase or phase-to-earth faults will increase. High temperature will degrade the quality of the transformer/generator insulation. The thermal overload protection estimates the internal heat content of the transformer/generator (temperature) continuously. This estimation is made by using a thermal model of the transformer/generator with two time constants, which is based on current measurement. Two warning levels are available. This enables actions in the power system to be done before dangerous temperatures are reached. If the temperature continues to increase to the trip value, the protection initiates a trip of the protected transformer/generator. Breaker failure protection CCRBRF Breaker failure protection (CCRBRF) ensures fast back-up tripping of surrounding breakers in case the own breaker fails to open. CCRBRF can be current based, contact based, or an adaptive combination of these two conditions.Current check with extremely short reset time is used as check criterion to achieve high security against inadvertent operation. Contact check criteria can be used where the fault current through the breaker is small. CCRBRF can be single- or three-phase initiated to allow use with single phase tripping applications. For the three-phase version of CCRBRF the current criteria can be set to operate only if two out of four for example, two phases or one phase plus the residual current start. This gives a higher security to the back-up trip command. CCRBRF function can be programmed to give a single- or three-phase re-trip of the own breaker to avoid unnecessary tripping of surrounding breakers at an incorrect initiation due to mistakes during testing.
Pole discordance protection CCRPLD
An open phase can cause negative and zero sequence currents which cause thermal stress on rotating machines and can cause unwanted operation of zero sequence or negative sequence current functions. Normally the own breaker is tripped to correct such a situation. If the situation persists the surrounding breakers should be tripped to clear the unsymmetrical load situation. The Polediscordance protection function CCRPLD operates based on information from auxiliary contacts of the circuit breaker for the three phases with additional criteria from unsymmetrical phase currents when required. Directional over/underpower protection GOPPDOP/ GUPPDUP The directional over-/under-power protection GOPPDOP/ GUPPDUP can be used wherever a high/low active, reactive or apparent power protection or alarming is required. The functions can alternatively be used to check the direction of active or reactive power flow in the power system. There are a number of applications where such functionality is needed. Some of them are: • generator reverse power protection • generator low forward power protection • detection of over/under excited generator • detection of reversed active power flow • detection of high reactive power flow • excessive line/cable loading with active or reactive power • generator reverse power protection Each function has two steps with definite time delay. Reset times for both steps can be set as well. By using optional metering class CT inputs accuracy of 0,5% can be achieved for steam turbine applications.Negative-sequence time overcurrent protection for machines NS2PTOC is intended primarily for the protection of generators against possible overheating of the rotor caused by negative sequence current in the stator current. The negative sequence currents in a generator may, among others, be caused by: • Unbalanced loads • Line to line faults • Line to earth faults • Broken conductors • Malfunction of one or more poles of a circuit breaker or a disconnector
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