AIM0006輸出電子卡件
電壓電平設(shè)定值可在0到250 Vdc之間調(diào)節(jié)。磁場過電壓時(shí)間延遲固定為10秒。
限定檢索
DECS-100限制器由勵(lì)磁電流增加觸發(fā)的過勵(lì)磁限制器（OEL）和由過多超前VAR觸發(fā)的欠勵(lì)磁限制器（UEL）。過勵(lì)磁限制DECS-100提供兩種類型的過勵(lì)磁限制：求和點(diǎn)和接管。
這是OEL的求和點(diǎn)。當(dāng)磁場電流水平增加到可調(diào)電流水平設(shè)定點(diǎn)以上時(shí)，前面板和BESTCOMS過勵(lì)磁限制指示燈亮。如果過勵(lì)磁條件在用戶可調(diào)報(bào)警時(shí)間延遲持續(xù)時(shí)間內(nèi)，端子AL1和AL2處的繼電器輸出AL2關(guān)閉。
求和點(diǎn)型OEL的優(yōu)點(diǎn)在于，它可以提供進(jìn)出的平滑過渡極限。其缺點(diǎn)是它不能直接控制磁場電流，但必須通過正常電流工作并且可能受到端子電壓變化的影響。
接管OEL。當(dāng)使用接管式過勵(lì)磁限制時(shí)，磁場電流水平限制由可調(diào)電流水平設(shè)定點(diǎn)確定。如果磁場電流增加超過可調(diào)電流水平設(shè)定點(diǎn)、前面板和BESTCOMS過勵(lì)磁限制指示器光和磁場電流受到限制并被迫遵循反時(shí)間曲線。接管型OEL的優(yōu)點(diǎn)在于，它提供勵(lì)磁機(jī)勵(lì)磁電流的直接控制而不依賴于正常電壓調(diào)節(jié)器的控制動(dòng)作。
其缺點(diǎn)是它可能不提供平穩(wěn)過渡到和超出極限
如果啟用了硬件關(guān)機(jī)，則DECS-100將在延時(shí)到期時(shí)禁用。當(dāng)過勵(lì)磁限制觸發(fā)停機(jī)后，DECS-100通電，過勵(lì)磁限位指示燈將點(diǎn)亮5秒鐘。
電流電平設(shè)定值可在0到15 Adc之間調(diào)整。報(bào)警時(shí)間延遲可從0調(diào)整到10秒。
欠勵(lì)磁限制當(dāng)領(lǐng)先var的水平增加到可調(diào)var水平設(shè)定點(diǎn)以上時(shí)，前面板和BESTCOMS欠勵(lì)磁限制指示燈亮。如果欠勵(lì)磁條件持續(xù)存在，則在可調(diào)報(bào)警時(shí)間延遲的持續(xù)時(shí)間內(nèi)，端子AL1和AL2處的繼電器輸出閉合。
如果啟用了硬件關(guān)機(jī)，則DECS-100將在延時(shí)到期時(shí)禁用。當(dāng)DECS-100在欠勵(lì)磁限制觸發(fā)停機(jī)后通電，欠勵(lì)磁限位指示燈將點(diǎn)亮5秒鐘。
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.
