SK827005交流接觸器
無(wú)功下垂補(bǔ)償
DECS-100提供無(wú)功下垂補(bǔ)償功能，以幫助分擔(dān)無(wú)功負(fù)載在并聯(lián)發(fā)電機(jī)運(yùn)行期間。當(dāng)該功能啟用時(shí)，DECS-100計(jì)算無(wú)功使用感應(yīng)到的發(fā)電機(jī)輸出電壓和電流量的發(fā)電機(jī)負(fù)載部分，然后相應(yīng)地修改電壓調(diào)節(jié)設(shè)定點(diǎn)。單位功率因數(shù)發(fā)電機(jī)負(fù)載導(dǎo)致：發(fā)電機(jī)輸出電壓無(wú)變化。滯后功率因數(shù)發(fā)電機(jī)負(fù)載（感應(yīng)）導(dǎo)致發(fā)電機(jī)輸出電壓降低。領(lǐng)先功率因數(shù)發(fā)電機(jī)負(fù)載（電容性）導(dǎo)致發(fā)電機(jī)輸出電壓增加。額定、標(biāo)稱B相時(shí)，下垂可調(diào)高達(dá)10%線路電流（通過(guò)端子CT1和CT2施加的1安培或5安培）和0.8功率因數(shù)。這個(gè)通過(guò)并聯(lián)發(fā)電機(jī)補(bǔ)償觸點(diǎn)輸入電路啟用和禁用下垂特性（端子52L和52M）。在var或功率因數(shù)控制模式下運(yùn)行時(shí)，下垂也被禁用。
低頻當(dāng)發(fā)電機(jī)頻率下降到所選拐點(diǎn)頻率設(shè)定值以下時(shí)，電壓設(shè)定值為由DECS-100自動(dòng)調(diào)整，使發(fā)電機(jī)電壓遵循選定的PU（每單位）V/Hz曲線在選定的PU V/Hz曲線上運(yùn)行時(shí)，低頻激活指示燈亮起前面板和BESTCOMS。低于12赫茲時(shí)禁用欠頻控制。膝關(guān)節(jié)頻率為以0.1赫茲增量從40赫茲到65赫茲可調(diào)，且PU V/Hz曲線的斜率可設(shè)置為0通過(guò)BESTCOMS軟件在0.01步中設(shè)置為3。斜率為0將有效禁用欠頻作用DECS-100的最小調(diào)節(jié)點(diǎn)約為標(biāo)稱值的30%設(shè)定點(diǎn)。保護(hù)DECS-100包括三種保護(hù)功能：發(fā)電機(jī)過(guò)壓、傳感電壓損失和磁場(chǎng)過(guò)電壓。每個(gè)保護(hù)功能都有一個(gè)相應(yīng)的前面板指示燈，當(dāng)功能處于活動(dòng)狀態(tài)。主動(dòng)保護(hù)功能也通過(guò)BESTCOMS通知。
發(fā)電機(jī)過(guò)電壓
發(fā)電機(jī)過(guò)電壓條件可配置為（在BESTCOMS中）關(guān)閉DECS-100繼電器輸出、禁用DECS-100、啟動(dòng)兩個(gè)動(dòng)作或不啟動(dòng)任何動(dòng)作。當(dāng)感測(cè)到發(fā)電機(jī)在可調(diào)報(bào)警時(shí)間內(nèi)，電壓升高超過(guò)可調(diào)電壓電平設(shè)定值DECS-100啟動(dòng)所選動(dòng)作。
如果DECS-100配置為關(guān)閉繼電器輸出，發(fā)電機(jī)過(guò)電壓條件將點(diǎn)亮前面板和BESTCOMS發(fā)電機(jī)過(guò)壓指示器，并關(guān)閉端子AL1處的繼電器輸出和AL2。
如果DECS-100配置為硬件關(guān)機(jī)，發(fā)電機(jī)過(guò)電壓條件將禁用報(bào)警時(shí)間延遲到期后的DECS-100。當(dāng)發(fā)電機(jī)后DECS-100通電時(shí)過(guò)電壓停機(jī)時(shí)，發(fā)電機(jī)過(guò)電壓指示燈將點(diǎn)亮5秒鐘。
電壓電平設(shè)定值可在系統(tǒng)電壓設(shè)定值的100%至120%之間調(diào)整。報(bào)警時(shí)間延遲可從0到10秒進(jìn)行調(diào)整。
Reactive Droop Compensation
The DECS-100 provides a reactive droop compensation feature to assist in the sharing of reactive load
during parallel generator operation. When this feature is enabled, the DECS-100 calculates the reactive
portion of the generator load using the sensed generator output voltage and current quantities and then
modifies the voltage regulation setpoint accordingly. A unity power factor generator load results in almost
no change in generator output voltage. A lagging power factor generator load (inductive) results in a
reduction of generator output voltage. A leading power factor generator load (capacitive) results in an
increase of generator output voltage. Droop is adjustable up to 10 percent with rated, nominal B-phase
line current (1 ampere or 5 amperes applied through terminals CT1 and CT2) and 0.8 power factor. The
droop feature is enabled and disabled through the Parallel Generator Compensation contact input circuit
(terminals 52L and 52M). Droop is also disabled when operating in var or power factor control modes.
Underfrequency
When generator frequency drops below the selected knee frequency setpoint, the voltage setpoint is
automatically adjusted by the DECS-100 so that generator voltage follows the selected PU (per unit) V/Hz
curve. When operating on the selected PU V/Hz curve, the Underfrequency Active indicator lights on the
front panel and in BESTCOMS. Underfrequency control is disabled below 12 hertz. The knee frequency is
adjustable from 40 to 65 hertz in 0.1 hertz increments and the PU V/Hz curve may be set at a slope of 0
to 3 in 0.01 steps through BESTCOMS software. A slope of 0 effectively disables the underfrequency
function. The DECS-100 has a minimum regulation point of approximately 30 percent of the nominal
setpoint. Protection
The DECS-100 includes three protective functions: generator overvoltage, loss of sensing voltage, and
field overvoltage. Each protective function has a corresponding front panel indicator that lights when the
function is active. An active protective function is also annunciated through BESTCOMS.
Generator Overvoltage
A generator overvoltage condition can be configured (in BESTCOMS) to close the DECS-100 relay
output, disable the DECS-100, initiate both actions, or initiate neither action. When the sensed generator
voltage increases above the adjustable voltage level setpoint for the duration of the adjustable alarm time
delay, the DECS-100 initiates the selected action.
If the DECS-100 is configured to close the relay output, a generator overvoltage condition will light the
front panel and BESTCOMS Generator Overvoltage indicator and close the relay output at terminals AL1
and AL2.
If the DECS-100 is configured for hardware shutdown, a generator overvoltage condition will disable the
DECS-100 after the alarm time delay expires. When the DECS-100 is powered up following a generator
overvoltage shutdown, the Generator Overvoltage indicator will light for five seconds.
The voltage level setpoint is adjustable from 100 to 120 % of the system voltage setting. The alarm time
delay is adjustable from 0 to 10 seconds.
