產(chǎn)品內(nèi)容介紹
BALDOR BC30D7A35-CL7終端PLC系統(tǒng)
過頻保護(hù)功能SAPTOF適用于所有需要可靠檢測高基波電力系統(tǒng)頻率的情況。電網(wǎng)中的負(fù)載突然下降或并聯(lián)故障會導(dǎo)致頻率過高?？拷l(fā)電廠的發(fā)電機(jī)調(diào)速器問題也會導(dǎo)致頻率過高。SAPTOF主要用于發(fā)電削減和補(bǔ)救措施方案。它還用作啟動負(fù)載恢復(fù)的頻率級。SAPTOF配有欠壓閉鎖。該操作基于正序電壓測量，需要連接兩相或三相中性點(diǎn)電壓。有關(guān)如何連接模擬輸入的信息，請參閱應(yīng)用手冊/IED應(yīng)用程序/模擬輸入/設(shè)置指南頻率變化率保護(hù)SAPFRC頻率變化率防護(hù)功能（SAPFRC）提供系統(tǒng)中主要干擾的早期指示。SAPFRC可用于發(fā)電削減、負(fù)荷削減和補(bǔ)救措施方案。SAPFRC可以區(qū)分頻率的正負(fù)變化。SAPFRC配有欠壓閉鎖。該操作基于正序電壓測量，需要連接兩相或三相中性點(diǎn)電壓。有關(guān)如何連接模擬輸入的信息，請參閱應(yīng)用手冊/IED應(yīng)用/模擬輸入/設(shè)置指南。
通用電流和電壓保護(hù)CVGAPC
由于保護(hù)模塊具有靈活的測量和設(shè)置設(shè)施，建議將其作為一種通用的后備保護(hù)，具有許多可能的應(yīng)用領(lǐng)域。內(nèi)置過電流保護(hù)功能有兩個(gè)可設(shè)置的電流水平。這兩種方法都可以用于定時(shí)或反時(shí)特性。過電流保護(hù)步驟可以通過可選擇的電壓極化量進(jìn)行定向。此外，它們可以是電壓和/或電流控制/限制的。還提供二次諧波抑制設(shè)施。極化電壓過低時(shí)，過電流特性可以被阻斷、非定向或根據(jù)參數(shù)設(shè)置命令使用電壓存儲器。此外，每個(gè)功能中有兩個(gè)過壓和兩個(gè)欠壓步驟，具有定時(shí)或反時(shí)特性。一般功能適用于低阻抗和電壓控制過電流解決方案的應(yīng)用。一般功能也可用于發(fā)電機(jī)變壓器保護(hù)應(yīng)用，其中通常需要電流和電壓的正序、負(fù)序或零序分量。此外，發(fā)電機(jī)應(yīng)用，如失磁、意外通電、定子或轉(zhuǎn)子過載、斷路器頭部閃絡(luò)和斷相檢測，只是這些功能的少數(shù)可能保護(hù)裝置。轉(zhuǎn)子接地故障保護(hù)勵磁繞組，包括轉(zhuǎn)子繞組和非旋轉(zhuǎn)勵磁設(shè)備，始終與轉(zhuǎn)子的金屬部件絕緣。如果轉(zhuǎn)子由空氣或氫氣冷卻，則絕緣電阻較高。如果轉(zhuǎn)子繞組用水冷卻，絕緣電阻要低得多。即使絕緣層完好無損，情況也是如此。磁場電路的絕緣故障將導(dǎo)致磁場繞組與接地之間的導(dǎo)電路徑。這意味著故障已導(dǎo)致現(xiàn)場接地故障。
Overfrequency protection SAPTOF
Overfrequency protection function SAPTOF is applicable in all situations, where reliable detection of high fundamental power system frequency is needed. Overfrequency occurs because of sudden load drops or shunt faults in the power network. Close to the generating plant, generator governor problems can also cause over frequency. SAPTOF is used mainly for generation shedding and remedial action schemes. It is also used as a frequency stage initiating load restoring. SAPTOF is provided with an undervoltage blocking. The operation is based on positive sequence voltage measurement and requires two phase-phase or three phaseneutral voltages to be connected. For information about how to connect analog inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines Rate-of-change frequency protection SAPFRC Rate-of-change frequency protection function (SAPFRC) gives an early indication of a main disturbance in the system. SAPFRC can be used for generation shedding, load shedding and remedial action schemes. SAPFRC can discriminate between positive or negative change of frequency. SAPFRC is provided with an undervoltage blocking. The operation is based on positive sequence voltage measurement and requires two phase-phase or three phase neutral voltages to be connected. For information about how to connect analog inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines.
General current and voltage protection CVGAPC
The protection module is recommended as a general backup protection with many possible application areas due to its flexible measuring and setting facilities. The built-in overcurrent protection feature has two settable current levels. Both of them can be used either with definite time or inverse time characteristic. The overcurrent protection steps can be made directional with selectable voltage polarizing quantity. Additionally they can be voltage and/or current controlled/restrained. 2nd harmonic restraining facility is available as well. At too low polarizing voltage the overcurrent feature can be either blocked, made non directional or ordered to use voltage memory in accordance with a parameter setting. Additionally two overvoltage and two undervoltage steps, either with definite time or inverse time characteristic, are available within each function. The general function suits applications with underimpedance and voltage controlled overcurrent solutions. The general function can also be utilized for generator transformer protection applications where positive, negative or zero sequence components of current and voltage quantities are typically required. Additionally, generator applications such as loss of field, inadvertent energizing, stator or rotor overload, circuit breaker head flash-over and open phase detection are just a few of possible protection arrangements with these functions. Rotor earth fault protection The field winding, including the rotor winding and the nonrotating excitation equipment, is always insulated from the metallic parts of the rotor. The insulation resistance is high if the rotor is cooled by air or by hydrogen. The insulation resistance is much lower if the rotor winding is cooled by water. This is true even if the insulation is intact. A fault in the insulation of the field circuit will result in a conducting path from the field winding to earth. This means that the fault has caused a field earth fault.
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