產(chǎn)品內(nèi)容介紹
ACCU-SORT AV6010電源模塊
過(guò)勵(lì)磁保護(hù)OEXPVPH當(dāng)電力變壓器或發(fā)電機(jī)的疊片鐵芯受到的磁通密度超過(guò)其設(shè)計(jì)極限時(shí)，雜散磁通將流入非疊片元件，而非設(shè)計(jì)用于攜帶磁通并導(dǎo)致渦流流動(dòng)。渦流會(huì)在相對(duì)較短的時(shí)間內(nèi)導(dǎo)致過(guò)熱，嚴(yán)重?fù)p壞絕緣和相鄰部件。該功能具有可設(shè)置的反向操作曲線(xiàn)和獨(dú)立的報(bào)警階段。電壓差動(dòng)保護(hù)VDCPTOV A電壓差動(dòng)監(jiān)測(cè)功能可用。它比較兩組三相電壓互感器的電壓，并具有一個(gè)靈敏報(bào)警步驟和一個(gè)跳閘步驟?；谌沃C波STEFPHIZ的95%和100%定子接地故障保護(hù)定子接地是一種故障率較高的故障類(lèi)型。發(fā)電機(jī)系統(tǒng)通常具有高阻抗接地，即通過(guò)中性點(diǎn)電阻器接地。該電阻器的尺寸通常可在發(fā)電機(jī)高壓端子直接發(fā)生固體接地故障時(shí)，提供3–15 A范圍內(nèi)的接地故障電流。與兩相導(dǎo)體之間的短路情況相比，相對(duì)較小的接地故障電流對(duì)發(fā)電機(jī)產(chǎn)生的熱應(yīng)力和機(jī)械應(yīng)力要小得多。無(wú)論如何，必須檢測(cè)發(fā)電機(jī)中的接地故障，并且必須跳閘發(fā)電機(jī)，即使與內(nèi)部短路相比，允許更長(zhǎng)的故障時(shí)間。在發(fā)電機(jī)組的正常非故障運(yùn)行中，中性點(diǎn)電壓接近零，發(fā)電機(jī)中沒(méi)有零序電流。當(dāng)發(fā)生相間接地故障時(shí)，中性點(diǎn)電壓將升高，并有電流流過(guò)中性點(diǎn)電阻器。
頻率保護(hù)
為了檢測(cè)發(fā)電機(jī)組繞組上的接地故障，可以使用中性點(diǎn)過(guò)電壓保護(hù)、中性點(diǎn)過(guò)電流保護(hù)、零序過(guò)電壓保護(hù)或剩余差動(dòng)保護(hù)。這些保護(hù)措施很簡(jiǎn)單，多年來(lái)效果很好。然而，這些簡(jiǎn)單的方案最多只能保護(hù)95%的定子繞組。它們?cè)诳拷行远说牡胤搅粝?%的未受保護(hù)。在不利條件下，盲區(qū)可從中性點(diǎn)延伸至20%。95%定子接地故障保護(hù)測(cè)量發(fā)電機(jī)星點(diǎn)中的基頻電壓分量，超過(guò)預(yù)設(shè)值時(shí)運(yùn)行。通過(guò)應(yīng)用這一原理，大約95%的定子繞組可以得到保護(hù)。為了保護(hù)靠近中性端的最后5%定子繞組，可以進(jìn)行三次諧波電壓測(cè)量。在100%定子E/F三次諧波保護(hù)中，可以應(yīng)用三次諧波電壓差動(dòng)原理、中性點(diǎn)三次諧波欠壓原理或終端側(cè)三次諧波過(guò)電壓原理。然而，強(qiáng)烈建議使用微分原理。這兩種測(cè)量原理的結(jié)合為整個(gè)定子繞組的接地故障提供了覆蓋范圍。欠頻保護(hù)SAPTUF由于網(wǎng)絡(luò)發(fā)電不足而發(fā)生欠頻。欠頻保護(hù)SAPTUF用于甩負(fù)荷系統(tǒng)、補(bǔ)救措施方案、燃?xì)廨啓C(jī)啟動(dòng)等。該操作基于正序電壓測(cè)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(qǐng)參閱應(yīng)用手冊(cè)/IED應(yīng)用/模擬輸入/設(shè)置指南
Overexcitation protection OEXPVPH
When the laminated core of a power transformer or generator is subjected to a magnetic flux density beyond its design limits, stray flux will flow into non-laminated components not designed to carry flux and cause eddy currents to flow. The eddy currents can cause excessive heating and severe damage to insulation and adjacent parts in a relatively short time. The function has settable inverse operating curves and independent alarm stages.Voltage differential protection VDCPTOV A voltage differential monitoring function is available. It compares the voltages from two three phase sets of voltage transformers and has one sensitive alarm step and one trip step. 95% and 100% Stator earth fault protection based on 3rd harmonic STEFPHIZ Stator earth fault is a fault type having relatively high fault rate. The generator systems normally have high impedance earthing, that is, earthing via a neutral point resistor. This resistor is normally dimensioned to give an earth fault current in the range 3 – 15 A at a solid earth-fault directly at the generator high voltage terminal. The relatively small earth fault currents give much less thermal and mechanical stress on the generator, compared to the short circuit case, which is between conductors of two phases. Anyhow, the earth faults in the generator have to be detected and the generator has to be tripped, even if longer fault time compared to internal short circuits, can be allowed.In normal non-faulted operation of the generating unit the neutral point voltage is close to zero, and there is no zero sequence current flow in the generator. When a phase-toearth fault occurs the neutral point voltage will increase and there will be a current flow through the neutral point resistor.
Frequency protection
To detect an earth fault on the windings of a generating unit one may use a neutral point overvoltage protection, a neutral point overcurrent protection, a zero sequence overvoltage protection or a residual differential protection. These protections are simple and have served well during many years. However, at best these simple schemes protect only 95% of the stator winding. They leave 5% close to the neutral end unprotected. Under unfavorable conditions the blind zone may extend up to 20% from the neutral. The 95% stator earth fault protection measures the fundamental frequency voltage component in the generator star point and it operates when it exceeds the preset value. By applying this principle approximately 95% of the stator winding can be protected. In order to protect the last 5% of the stator winding close to the neutral end the 3rd harmonic voltage measurement can be performed. In 100% Stator E/F 3rd harmonic protection either the 3rd harmonic voltage differential principle, the neutral point 3rd harmonic undervoltage principle or the terminal side 3rd harmonic overvoltage principle can be applied. However, differential principle is strongly recommended. Combination of these two measuring principles provides coverage for entire stator winding against earth faults.Underfrequency protection SAPTUF Underfrequency occurs as a result of a lack of generation in the network. Underfrequency protection SAPTUF is used for load shedding systems, remedial action schemes, gas turbine startup and so on. SAPTUF is also provided with 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
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