AIM0006输出电子卡件
电压电平设定值可在0到250 Vdc之间调节。磁场过电压时间延迟固定为10秒。
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DECS-100限制器由励磁电流增加触发的过励磁限制器（OEL）和由过多超前VAR触发的欠励磁限制器（UEL）。过励磁限制DECS-100提供两种类型的过励磁限制：求和点和接管。
这是OEL的求和点。当磁场电流水平增加到可调电流水平设定点以上时，前面板和BESTCOMS过励磁限制指示灯亮。如果过励磁条件在用户可调报警时间延迟持续时间内，端子AL1和AL2处的继电器输出AL2关闭。
求和点型OEL的优点在于，它可以提供进出的平滑过渡极限。其缺点是它不能直接控制磁场电流，但必须通过正常电流工作并且可能受到端子电压变化的影响。
接管OEL。当使用接管式过励磁限制时，磁场电流水平限制由可调电流水平设定点确定。如果磁场电流增加超过可调电流水平设定点、前面板和BESTCOMS过励磁限制指示器光和磁场电流受到限制并被迫遵循反时间曲线。接管型OEL的优点在于，它提供励磁机励磁电流的直接控制而不依赖于正常电压调节器的控制动作。
其缺点是它可能不提供平稳过渡到和超出极限
如果启用了硬件关机，则DECS-100将在延时到期时禁用。当过励磁限制触发停机后，DECS-100通电，过励磁限位指示灯将点亮5秒钟。
电流电平设定值可在0到15 Adc之间调整。报警时间延迟可从0调整到10秒。
欠励磁限制当领先var的水平增加到可调var水平设定点以上时，前面板和BESTCOMS欠励磁限制指示灯亮。如果欠励磁条件持续存在，则在可调报警时间延迟的持续时间内，端子AL1和AL2处的继电器输出闭合。
如果启用了硬件关机，则DECS-100将在延时到期时禁用。当DECS-100在欠励磁限制触发停机后通电，欠励磁限位指示灯将点亮5秒钟。
The voltage level setpoint is adjustable from 0 to 250 Vdc. The field overvoltage time delay is fixed at 10 seconds. Limiters DECS-100 limiters consist of an overexcitation limiter (OEL) triggered by an increase in field current and an underexcitation limiter (UEL) triggered by excessive leading vars. Overexcitation Limiting The DECS-100 provides two types of overexcitation limiting: summing point and takeover. Summing Point OEL. When the level of field current increases above the adjustable current level setpoint, the front panel and BESTCOMS Overexcitation Limiting indicators light. If the overexcitation condition persists for the duration of the user-adjustable alarm time delay, the relay output at terminals AL1 and AL2 closes. The advantage of a summing-point type of OEL is that it can provide a smooth transition into and out of the limit. Its drawback is that it does not control field current directly, but has to work through the normal voltage regulator, and may be influenced by changes in terminal voltage. Takeover OEL. When takeover-style overexcitation limiting is used, the level of field current at which limiting occurs is determined by an adjustable current level setpoint. If the field current increases above the adjustable current level setpoint, the front panel and BESTCOMS Overexcitation Limiting indicators light and the field current is limited and forced to follow the inverse time curve. The advantage of a takeover type of OEL is that it provides direct control of the exciter field current without relying on the normal voltage regulator’s control action. Its drawback is that it may not provide a smooth transition into and out of the limit. If hardware shutdown is enabled, the DECS-100 will be disabled when the time delay expires. When the DECS-100 is powered up following a shutdown triggered by overexcitation limiting, the Overexcitation Limiting indicator will light for five seconds. The current level setpoint is adjustable from 0 to 15 Adc. The alarm time delay is adjustable from 0 to 10 seconds. Underexcitation Limiting When the level of leading vars increases above the adjustable var level setpoint, the front panel and BESTCOMS Underexcitation Limiting indicators light. If the underexcitation condition persists for the duration of the adjustable alarm time delay, the relay output at terminals AL1 and AL2 closes. If hardware shutdown is enabled, the DECS-100 will be disabled when the time delay expires. When the DECS-100 is powered up following a shutdown triggered by underexcitation limiting, the Underexcitation Limiting indicator will light for five seconds.
