產(chǎn)品內(nèi)容介紹
BALDOR BC29D7A35-CO7驅(qū)動控制器
同步發(fā)電機的勵磁電路通常不接地。
因此，勵磁繞組上的單個接地故障只會導(dǎo)致非常小的故障電流。因此，接地故障不會對發(fā)電機造成任何損壞。此外，它不會以任何方式影響發(fā)電機組的運行。然而，單個接地故障的存在會增加勵磁電路中其他點的電應(yīng)力。這意味著磁場繞組另一點發(fā)生第二次接地故障的風(fēng)險大大增加。第二次接地故障將導(dǎo)致磁場短路，并造成嚴重后果。轉(zhuǎn)子接地故障保護基于向隔離磁場電路注入交流電壓。在非故障條件下，不會有與此注入電壓相關(guān)的電流。如果發(fā)生轉(zhuǎn)子接地故障，轉(zhuǎn)子接地保護將檢測到這種情況。根據(jù)發(fā)電機所有者的理念，此操作狀態(tài)將報警和/或發(fā)電機將跳閘。轉(zhuǎn)子接地故障保護（RXTTE4）需要一個注入裝置，板上需要一個保護電阻器才能正常工作。9.二次系統(tǒng)監(jiān)督電流電路監(jiān)督CCSRDIF電流互感器鐵芯開路或短路會導(dǎo)致許多保護功能不必要地運行，例如差動、接地故障電流和負序電流功能。必須記住，CT電路開路時保護功能的阻塞將意味著這種情況將繼續(xù)存在，極高的電壓將給二次電路帶來壓力。電流電路監(jiān)控（CCSRDIF）將來自三相電流互感器鐵芯組的殘余電流與來自電流互感器另一組鐵芯的單獨輸入上的中性點電流進行比較。檢測到差異表明電路中存在故障，并用作報警或阻止預(yù)期會導(dǎo)致不必要跳閘的保護功能。
保險絲故障監(jiān)控SDDRFUF
熔斷器故障監(jiān)測功能（SDDRFUF）的目的是在電壓互感器和IED之間的二次電路發(fā)生故障時阻斷電壓測量功能，以避免可能發(fā)生的不必要操作。熔斷器故障監(jiān)控功能基本上有三種不同的算法，基于負序和零序的算法，以及額外的電壓和電流增量算法。建議對隔離或高阻抗接地網(wǎng)絡(luò)中使用的IED使用負序檢測算法。它基于負序測量量，在不存在負序電流3I2的情況下，高電壓值3U2。建議對直接或低阻抗接地網(wǎng)絡(luò)中使用的IED使用零序檢測算法。它基于零序測量量，在不存在剩余電流3I0的情況下，電壓3U0的高值。為了更好地適應(yīng)系統(tǒng)要求，引入了一種操作模式設(shè)置，使得可以為負序和基于零序的功能選擇操作條件。通過選擇不同的操作模式，可以在負序和零序算法之間選擇不同的交互可能性?？蓪⒒陔娏髟隽亢碗妷涸隽繙y量的標準添加到熔斷器故障監(jiān)測功能中，以檢測三相熔斷器故障，實際上，三相熔斷器的故障與電站運行期間的電壓互感器切換更為相關(guān)。
The field circuit of a synchronous generator is normally unearthed.
Therefore, a single earth fault on the field winding will cause only a very small fault current. Thus the earth fault does not produce any damage in the generator. Furthermore, it will not affect the operation of a generating unit in any way. However, the existence of a single earth fault increases the electric stress at other points in the field circuit. This means that the risk for a second earth fault at another point on the field winding has increased considerably. A second earth fault will cause a field short-circuit with severe consequences. The rotor earth fault protection is based on injection of an AC voltage to the isolated field circuit. In non-faulted conditions there will be no current flow associated to this injected voltage. If a rotor earth fault occurs, this condition will be detected by the rotor earth fault protection. Depending on the generator owner philosophy this operational state will be alarmed and/or the generator will be tripped. An injection unit is required for rotor earth fault protection (RXTTE4) and a protective resistor on plate for correct operation. 9. Secondary system supervision Current circuit supervision CCSRDIF Open or short circuited current transformer cores can cause unwanted operation of many protection functions such as differential, earth-fault current and negative-sequence current functions. It must be remembered that a blocking of protection functions at an occurrence of open CT circuit will mean that the situation will remain and extremely high voltages will stress the secondary circuit. Current circuit supervision (CCSRDIF) compares the residual current from a three phase set of current transformer cores with the neutral point current on a separate input taken from another set of cores on the current transformer. A detection of a difference indicates a fault in the circuit and is used as alarm or to block protection functions expected to give unwanted tripping.
Fuse failure supervision SDDRFUF
The aim of the fuse failure supervision function (SDDRFUF) is to block voltage measuring functions at failures in the secondary circuits between the voltage transformer and the IED in order to avoid unwanted operations that otherwise might occur. The fuse failure supervision function basically has three different algorithms, negative sequence and zero sequence based algorithms and an additional delta voltage and delta current algorithm. The negative sequence detection algorithm is recommended for IEDs used in isolated or high-impedance earthed networks. It is based on the negative-sequence measuring quantities, a high value of voltage 3U2 without the presence of the negative-sequence current 3I2. The zero sequence detection algorithm is recommended for IEDs used in directly or low impedance earthed networks. It is based on the zero sequence measuring quantities, a high value of voltage 3U0 without the presence of the residual current 3I0. For better adaptation to system requirements, an operation mode setting has been introduced which makes it possible to select the operating conditions for negative sequence and zero sequence based function. The selection of different operation modes makes it possible to choose different interaction possibilities between the negative sequence and zero sequence based algorithm. A criterion based on delta current and delta voltage measurements can be added to the fuse failure supervision function in order to detect a three phase fuse failure, which in practice is more associated with voltage transformer switching during station operations.
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