GE DS200TCPDG1BEC數(shù)字量輸入模塊AST的四個(gè)電磁閥組成串并聯(lián)冗余結(jié)構(gòu)，分為兩個(gè)通道：通道1包括20-1/AST與20-3/AST，而通道2則包括20-2/AST與20-4/AST。每一通道在危急遮斷系統(tǒng)（ETS）控制柜中各自的繼電器供電，當(dāng)停機(jī)信號(hào)來(lái)時(shí)，開(kāi)啟所有的ATS電磁閥，以使機(jī)組停機(jī)。系統(tǒng)設(shè)計(jì)成兩個(gè)相同獨(dú)立通道的目的是為了使誤動(dòng)作的可能性減至少。在汽輪機(jī)運(yùn)行時(shí)，每一通道可以單獨(dú)地進(jìn)行在線試驗(yàn)，而不會(huì)產(chǎn)生遮斷或在實(shí)際需要遮斷時(shí)拒動(dòng)。如圖3所示，如果通道1中閥20-1/AST動(dòng)作，允許AST母管油流經(jīng)過(guò)，但通道2中另外兩只電磁閥（20-2/AST，20-4/AST）仍然堵塞著回油通路，不會(huì)引起AST母管油泄掉而使系統(tǒng)遮斷。
兩只并聯(lián)的OPC電磁閥（20-1/OPC，20-2/OPC）對(duì)DEH來(lái)的OPC控制信號(hào)起作用。一旦發(fā)生甩負(fù)荷或當(dāng)機(jī)組轉(zhuǎn)速超速到額定值103％時(shí)，則DEH將給電磁閥發(fā)信號(hào)，于是從調(diào)節(jié)汽閥和再熱調(diào)節(jié)汽閥油動(dòng)機(jī)至OPC母管的油快速泄放到回油管，使調(diào)節(jié)汽閥與再熱調(diào)節(jié)汽閥迅速關(guān)閉。連續(xù)控制油動(dòng)機(jī)與DEH的伺服模塊配合可使閥門定位在全開(kāi)全關(guān)之間任何位置。如圖4所示，在快關(guān)油（或安全油）建立期間，油動(dòng)機(jī)受伺服閥控制。在伺服模塊中閥位給定電壓與反映油動(dòng)機(jī)行程的LVDT反饋電壓進(jìn)行比較，經(jīng)比例放大后輸出給伺服閥。伺服閥根據(jù)控制信號(hào)的大小及方向控制作油動(dòng)機(jī)開(kāi)啟或關(guān)閉的速度。油動(dòng)機(jī)行程到達(dá)給定值時(shí)，伺服閥處于斷流位置，油動(dòng)機(jī)行程維持不變。The four solenoid valves of AST form a series parallel redundancy structure, which is divided into two channels: channel 1 includes 20-1/AST and 20-3/AST, while channel 2 includes 20-2/AST and 20-4/AST. Each channel is powered by its own relay in the emergency trip system (ETS) control cabinet. When the shutdown signal comes, open all ATS solenoid valves to shut down the unit. The system is designed into two identical independent channels to minimize the possibility of malfunction. When the turbine is running, each channel can be independently tested online without trip or refusal to operate when trip is actually required. As shown in Figure 3, if the valve 20-1/AST in channel 1 acts, the AST header oil is allowed to flow through, but the other two solenoid valves (20-2/AST, 20-4/AST) in channel 2 still block the oil return path, which will not cause the AST header oil to drain and block the system.
Two parallel OPC solenoid valves (20-1/OPC, 20-2/OPC) act on OPC control signals from DEH. In case of load rejection or when the speed of the unit exceeds 103% of the rated value, DEH will send a signal to the solenoid valve, so that the oil from the regulating steam valve and reheat regulating steam valve hydraulic servo motor to the OPC header can be quickly discharged to the oil return pipe, so that the regulating steam valve and reheat regulating steam valve can be quickly closed. The continuous control hydraulic servo motor can position the valve at any position between full open and full close by cooperating with the servo module of DEH. As shown in Figure 4, the hydraulic servo motor is controlled by the servo valve during the establishment of quick closing oil (or safety oil). In the servo module, the given voltage of the valve position is compared with the LVDT feedback voltage reflecting the stroke of the hydraulic servo motor, and is output to the servo valve after proportional amplification. The servo valve controls the opening or closing speed of the hydraulic servo motor according to the size and direction of the control signal. When the stroke of the hydraulic servo motor reaches the set value, the servo valve is in the cut-off position, and the stroke of the hydraulic servo motor remains unchanged.
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●使用前:

在操作和維護(hù)，安裝設(shè)備之前，請(qǐng)閱讀并嚴(yán)格遵守安全相關(guān)的信息。

Read and strictly follow safety-related information before operatingmaintainingand installing equipment.

●使用者要求:

必須從事安裝，組裝或維護(hù)設(shè)備等相關(guān)工控電氣機(jī)械以及其他相關(guān)技術(shù)的人員。

Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.應(yīng)用范圍:

應(yīng)用于品牌本系列工業(yè)以及生產(chǎn)生活自動(dòng)化設(shè)備產(chǎn)品。

Used in the brand of this series of industriaand production automation eauipment products

適用于場(chǎng)景:系統(tǒng)集成，非標(biāo)定制，產(chǎn)線升級(jí)改造，原設(shè)備電氣替換等等。

Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

●操作人員:

應(yīng)該由本品牌專業(yè)培訓(xùn)操作員來(lái)安裝、操作和維修設(shè)備。專業(yè)人員具有技術(shù)能力強(qiáng)，熟悉安全信息和安全實(shí)施:

熟悉設(shè)備的安裝加工、操作和維護(hù):熟悉處理所有的潛在危險(xiǎn)情況。

Equipment should be installed,operated and maintained by trained operators from the brand

●危險(xiǎn)情況

警告

.請(qǐng)注意使用人員的人身安全。

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Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.

●服務(wù)行業(yè)

適用水泥，木業(yè)，石業(yè)，橡膠，石油，化工，發(fā)電，環(huán)保，水處理，制冷，交通，鋼鐵，食品，飲料，船舶，制冷等行業(yè)

Applicable to cementwood,stone,rubber,petroleumchemical, power generation