產(chǎn)品內(nèi)容介紹
SCHENCK IPPC-9150T-T-N控制器
變壓器差動保護T2WPDIF/T3WPDIF變壓器差動保護、雙繞組（T2WPDIF）和變壓器差動保護，三繞組（T3WPDIF。該功能可提供多達三相電流輸入組。所有電流輸入均具有百分比偏置抑制特性，使IED適用于多斷路器站布置中的雙繞組或三繞組變壓器。通常，短路故障電流非常大，即大大大于發(fā)電機額定電流。有可能在發(fā)電機中性點附近的相位之間發(fā)生短路，從而導致相對較小的故障電流。由于發(fā)電機勵磁過低，故障電流也會受到限制。因此，發(fā)電機相間短路的檢測應相對靈敏，能夠檢測到較小的故障電流。同樣重要的是，發(fā)電機差動保護不會因外部故障而跳閘，因為大量故障電流從發(fā)電機流出。為了結(jié)合快速故障清除以及靈敏度和選擇性，發(fā)電機差動保護通常是發(fā)電機相間短路的最佳選擇。如果用于保護并聯(lián)電抗器或小母線槽，發(fā)電機差動保護GENPDIF也非常適合快速、靈敏和選擇性地清除故障。
設置設施包括
差動保護應用于電站內(nèi)所有類型的電力變壓器、帶或不帶有載分接開關的自耦變壓器以及并聯(lián)電抗器和本地饋線。對于嚴重貫通故障，包括自適應穩(wěn)定功能。通過引入有載分接開關位置，可以將差動保護傳感器設置為最佳靈敏度，從而以低故障水平覆蓋內(nèi)部故障。勵磁涌流和過勵磁電流分別包括穩(wěn)定。在外部故障期間，還包括系統(tǒng)恢復浪涌和CT飽和的自適應穩(wěn)定。包括一個高設置無限制差動電流保護元件，用于在高內(nèi)部故障電流下進行超高速跳閘。其中包括一種基于對稱元件理論的創(chuàng)新型靈敏差動保護元件。該元件提供了電力變壓器繞組匝間故障的最佳可能覆蓋范圍。1Ph高阻抗差動保護HZPDIF當相關CT鐵芯具有相同的匝數(shù)比和相似的磁化特性時，可以使用1Ph高阻抗差動保護（HZPDIF）功能。它通過接線、串聯(lián)電阻器和安裝在外部連接到IED的依賴電壓的電阻器來利用外部CT電流總和。HZPDIF可用于保護發(fā)電機定子繞組、三通饋線或母線。六個單相功能塊可用于兩個三相區(qū)域母線保護。
Transformer differential protection T2WPDIF/T3WPDIF
The Transformer differential protection, two-winding (T2WPDIF) and Transformer differential protection, threewinding (T3WPDIF) are provided with internal CT ratio matching and vector group compensation and settable zero sequence current elimination. The function can be provided with up to three-phase sets of current inputs. All current inputs are provided with percentage bias restraint features, making the IED suitable for two- or three-winding transformer in multi-breaker station arrangements. Normally, the short circuit fault current is very large, that is, significantly larger than the generator rated current. There is a risk that a short circuit can occur between phases close to the neutral point of the generator, thus causing a relatively small fault current. The fault current can also be limited due to low excitation of the generator. Therefore, it is desired that the detection of generator phase-to-phase short circuits shall be relatively sensitive, detecting small fault currents.It is also of great importance that the generator differential protection does not trip for external faults, with large fault currents flowing from the generator. To combine fast fault clearance, as well as sensitivity and selectivity, the generator differential protection is normally the best choice for phase-to-phase generator short circuits. Generator differential protection GENPDIF is also well suited to generate fast, sensitive and selective fault clearance, if used to protect shunt reactors or small busduct.
The setting facilities cover
the application of the differential protection to all types of power transformers and autotransformers with or without load tap changer as well as shunt reactors and local feeders within the station. An adaptive stabilizing feature is included for heavy throughfaults.By introducing the load tap changer position, the differential protection pick-up can be set to optimum sensitivity thus covering internal faults with low fault level. Stabilization is included for inrush and overexcitation currents respectively. Adaptive stabilization is also included for system recovery inrush and CT saturation during external faults. A high set unrestrained differential current protection element is included for a very high speed tripping at a high internal fault currents. Included is an innovative sensitive differential protection element based on the theory of symmetrical components. This element offers the best possible coverage of power transformer windings turn to turn faults.1Ph High impedance differential protection HZPDIF The 1Ph High impedance differential protection (HZPDIF) function can be used when the involved CT cores have the same turns ratio and similar magnetizing characteristics. It utilizes an external CT current summation by wiring, a series resistor, and a voltage dependent resistor which are mounted externally connected to the IED. HZPDIF can be used to protect generator stator windings, teefeeders or busbars. Six single phase function blocks are available to allow application for two three-phase zones busbar protection.
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