SLS1508 KJ2201X1-BA1 12P3162X112數(shù)字量卡件
外部設(shè)備的端子用于將控制裝置連接到系統(tǒng)的接線板位于控制。包括用于連接其他外部設(shè)備的附加端子設(shè)備如圖4-3所示。
平行并聯(lián)有兩種基本方法：降速，其中速度降低負(fù)載和等時(shí)，其中速度保持恒定。平行
圖4-4所示系統(tǒng)包括：?負(fù)載匹配電路（1）?負(fù)載放大器電路（2）
從端子16連接的發(fā)電機(jī)聯(lián)絡(luò)斷路器上的輔助觸點(diǎn)（或高壓控制上的端子0）到端子14用于選擇同步負(fù)載共享操作。可以使用與輔助觸點(diǎn)串聯(lián)的觸點(diǎn)選擇降速或同步運(yùn)行模式。
如果輔助觸點(diǎn)或下降觸點(diǎn)打開，則控制處于下降狀態(tài)。當(dāng)它們都關(guān)閉時(shí)，控制處于同步負(fù)載共享狀態(tài)。
只有一臺(tái)機(jī)組在線，發(fā)電機(jī)將承擔(dān)可用負(fù)荷并保持以等時(shí)速度。如果其他單元在線，負(fù)載匹配電路將燃油輸出校正為比例負(fù)載。
負(fù)載感應(yīng)電路中的放大器計(jì)算每個(gè)相位承載的負(fù)載發(fā)電機(jī)的。每個(gè)相位上的電流負(fù)載乘以電流和電壓之間的相位差，以及三相以確定總負(fù)載。
負(fù)載放大器的輸出由負(fù)載增益電位計(jì)調(diào)整
如圖4-5所示。通過將每個(gè)單元上的負(fù)載增益電壓設(shè)置為相同
在滿負(fù)荷水平，實(shí)現(xiàn)了比例負(fù)荷分擔(dān)。不管差異在系統(tǒng)中的發(fā)電機(jī)組容量中，每個(gè)發(fā)電機(jī)組加載到
其容量的相同百分比。單個(gè)負(fù)載增益的最終調(diào)整電位計(jì)將補(bǔ)償發(fā)電機(jī)組中的微小差異。
端子0-在高壓型號(hào)上，該端子為輸入端子提供+20 Vdc14、17、18、19和30。在低壓型號(hào)上，不使用此端子。端子14當(dāng)觸點(diǎn)閉合時(shí)，控制處于同步狀態(tài)，且負(fù)載分配線路是活動(dòng)的。打開時(shí)，控制處于下降狀態(tài)，負(fù)載共享線路被禁用。端子16在低壓型號(hào)上，該端子提供+dc電源輸入端子14、17、18、19和30，是直流電源+連接點(diǎn)。高壓型號(hào)，該端子是交流輸入端子（在交流電源上）或直流輸入端子之一+連接點(diǎn)（直流電源上）。端子17-A觸點(diǎn)，用于在需要停機(jī)時(shí)將輸出驅(qū)動(dòng)至最小燃油*跨接導(dǎo)線不得用于高壓型號(hào)。端子18-A觸點(diǎn)，用于超控故障轉(zhuǎn)速保護(hù)電路以進(jìn)行啟動(dòng)和起動(dòng)燃油設(shè)置校準(zhǔn)。端子19—觸點(diǎn)閉合時(shí)從怠速加速至額定轉(zhuǎn)速的觸點(diǎn)。端子23和24是遠(yuǎn)程微調(diào)速度設(shè)置的外部裝置。它也可用于手動(dòng)同步或運(yùn)行時(shí)加載發(fā)電機(jī)在下垂模式下。端子25和26提供了可選速度和相位匹配（SPM）的使用同步器。SPM同步器自動(dòng)生成一個(gè)信號(hào)，以使離線發(fā)電機(jī)的原動(dòng)機(jī)，使其頻率和相位與公共汽車**
*-不要將最小燃油接觸選項(xiàng)用作任何緊急停機(jī)序列的一部分。
**-更多信息，請(qǐng)參見伍德沃德手冊(cè)82384，SPM-A同步器9905-002在SPM-A上。
Terminals for External Devices
Terminal blocks for wiring the control to the system are at the lower front panel of
the control. Additional terminals are included for connecting other external
devices as shown in Figure 4-3.
Paralleling
There are two basic methods used for paralleling: droop, where speed decreases
with load, and isochronous, where speed remains constant. The paralleling
system as shown in Figure 4-4 consists of:
? Load Matching circuit (1)
? a Load Amplifier circuit (2)
An auxiliary contact on the generator tie-breaker connected from terminal 16 (or
terminal 0 on high voltage controls) to terminal 14 is used to select isochronous
load-sharing operation. A contact in series with the auxiliary contact may be used
to select either the droop or isochronous mode of operation.
If either the auxiliary contact or the droop contact is open, the control is in droop.
When they are both closed, the control is in isochronous load sharing.
With only one unit on line, the generator picks up the available load and remains
at isochronous speed. If additional units are on line, the Load Matching circuit
corrects the fuel output to proportion load.
An amplifier in the load-sensing circuit computes the load carried by each phase
of the generator. The current load on each phase is multiplied by the cosine of
the phase difference between the current and the voltage, and the three phases
are added to determine the total load.
The output of the load amplifier is adjusted by the LOAD GAIN potentiometer
shown in Figure 4-5. By setting the load-gain voltage on each unit to the same
level at full load, proportional load sharing is achieved. Regardless of differences
in generator-set capacities in the system, each generator set is loaded to the
same percentage of its capacity. A final adjustment of the individual LOAD GAIN
potentiometers will compensate for minor differences in the generator sets.
Terminal 0—On high voltage models, this terminal provides +20 Vdc for input terminals
14, 17, 18, 19, and 30. On low voltage models, this terminal is not used.
Terminal 14—When contact is closed, control is in isochronous and the load sharing lines
are active. When open, control is in droop and the load sharing lines are disabled.
Terminal 16—On low voltage models, this terminal provides a +dc source for input
terminals 14, 17, 18, 19, and 30, and is the dc supply + connecting point. On high voltage
models, this terminal is either one of the ac input terminals (on ac supply) or the dc +
connecting point (on dc supply).
Terminal 17—A contact to drive the output to minimum fuel when required for shutdown.*
The jumper must not be used on high voltage models.
Terminal 18—A contact to override the failed speed protective circuit for start-up and start
fuel setup calibration.
Terminal 19—A contact to accelerate from idle to rated speed when the contact is closed.
Terminals 23 and 24—An external means of remotely fine tuning the speed setting. It
also may be used for manual synchronization or for loading the generator when operating
in droop mode.
Terminals 25 and 26—Provide for use of an optional speed and phase matching (SPM)
synchronizer. An SPM synchronizer automatically generates a signal to bias the speed of
the prime mover of an off-line generator so that its frequency and phase match those of
the bus.**
*—Do not use the minimum fuel contact option as part of any emergency stop sequence.
**—See Woodward manual 82384, SPM-A Synchronizer 9905-002, for more information
on the SPM-A.
