西門子伺服驅動器軸卡6SN1118-0NK01-0AA1
西門子伺服驅動器軸卡6SN1118-0NK01-0AA1
西門子伺服驅動器軸卡6SN1118-0NK01-0AA1
半導體模擬勵磁調節器各單元的功能
(1)測量比較單元。測量發電機電壓信號，將其按比例變換成直流電壓信號，與給 定直流電壓進行比較，送出發電機電壓偏差信號。為使並列運行的各機組合理穩定地分 擔無功功率，應設置調差單元。
(2)綜合放大單元。由綜合放大環節、比例積分環節和適應器環節組成。綜合放大 環節將各種基本測量輸出的、反饋和輔助限制生成的、以及穩定和補償反應的各種直流 信號加以綜合放大，輸出給比例積分環節。比例積分環節按預定的調節規律進行加工後 輸出。適應器環節將信號電壓經放大加工成為移相控制信號電壓以控制勵磁電壓。
(3)移相觸發單元。接受綜合放大單元的輸出信號電壓的大小，改變晶閘管觸發控 制角的大小，以控制勵磁電壓。
(4)穩壓電源。把輸入的交、直流電源變換成勵磁調節器所需的、電壓穩定的電 源。對輸入的交、直流電源要能適時自動切換。
(5)其他各種輔助功能單元：
1)大勵磁電流限制器。將晶閘管整流橋輸出的總電流值限制在給定的勵磁頂值 電流以下。
2)勵磁過電流限制器。在強勵或勵磁過電流達到允許時間時，將勵磁電流減小到 長期允許大值。
3)欠勵磁限制器。根據發電機和電力係統穩定計算的需要，將晶閘管整流橋輸出 小電流限制在有功功率對應的給定值上。
4) 電壓/頻率限制器。主要用於發電機與電網斷開空載運行期間，防止因調速器故 障而使機組低於工頻運行，出現誤強勵，產生過勵磁故障。
(6)手動單元。早期手動調節勵磁，採用開環方式，後來採用以勵磁電流為信號源 的閉環調節方式。
(7)跟蹤單元。在調節器以“自動方式”按發電機端電壓為信號閉環調節的每一時 刻，跟蹤單元將手動單元的勵磁電流信號“自動緊緊跟蹤對應前述電壓信號”，以保證 在“自動”切換到 “手動”方式時，不出現勵磁的大幅度波動。當調節器 “自動”調節 方式有一主一備雙通道時，則需要保證備用通道自動跟蹤主通道的信號。
(8)失衡(脈衝消失)保護。監測主通道，在主通道脈衝消失或失常時，自動切換 到備用通道。
(9) 電壓互感器斷線保護。當勵磁測量信號所用的電壓互感器電壓因故障消失時， 將勵磁調節器從“自動”切到“手動”運行。
微機數字式勵磁調節器各單元的功能
(1)模擬量輸入輸出通道。輸入採樣的量為發電機端電壓、定子電流、有功功率、 無功功率、轉子電流和係統電壓等電量。採樣可以是交流也可以是直流。交流採樣每周12點即可。
(2)開關量輸入輸出通道。為了和防止幹擾，開關量輸入輸出通道均需經過光 電隔離。它主要用於現場操作、參數給定、機組狀態、保護等信號的輸入，以及調節器 對現場其他勵磁設備的操作指令和調節器各種故障信號的輸出。
(3)數字式移相觸發器。其功能和結構與模擬式移相觸發器類似，由同步整形、移 相計算、脈衝形成、脈衝放大等環節組成。
微機數字式勵磁調節器的軟件功能
微機數字式勵磁調節器的特點就是將模擬勵磁調節器的各項由硬件實現的功能，如信號比較、限制、綜合等功能用軟件代替。
NX700 1個
ACS880-01-087A-3+D150 1
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SGM7J-01A7C6S 8
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JZSP-C7PA2D-05-E 16
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1783-ETAP2F 1 9292
HRD-PU001-003-02-R 52672
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HRH40M-50-60-R 11544 各1
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HAM RADIO CRYSTAL M-11 T 19-3039 PAIR T+R 30.850 MC
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