【正文】 ——可靠系數(shù)，；——返回系數(shù)，；——保護安裝側變壓器額定電流。電流互感器熱穩(wěn)定能力常以1S允許通過的一次額定電流IN1的倍數(shù)來表示，故熱穩(wěn)定應按下式校驗(IN1)2≥ I∞2 (717)式中，IN1 — 由生產(chǎn)廠給出的電流互感器的熱穩(wěn)定倍數(shù)及一次側額定電流。DZ—47型中間繼電器用于自動裝置、繼電保護裝置和通訊設備中，作為信號指示和啟閉電路的元件，并可頻繁起動三相380V、1KW以下的電動機。（8）觸電斷開容量220V/1A/50W（9）介質(zhì)強度2kV/50Hz/1min（10）絕緣電阻不小于300MΩ（在交變濕熱條件下不小于4 MΩ）。（13）。（14）機械壽命為104次。（5）。老師的嚴謹治學態(tài)度、淵博的知識、盡責無私的奉獻精神使我深受啟迪。 puter Electricity substation is a normal power system, an integral part of safe operation, it is conducive to power transmission lines in the same paragraph, to the same level of power, the voltage in the transmission process, after step after stepup transformer can be reduced transmission of electric current, so to minimize the loss of lines to achieve the objective of longdistance delivery points to meet the needs of users. 1 Relay Overview In power system operation, in order to ensure the fundamental power supply reliability and system operation, it must make the appropriate protection. When the power system failure or abnormal conditions, in the shortest possible time and the smallest in the region, faulty equipment automatically removed from the system, or a signal from the duty to eliminate root causes of abnormal working conditions, to reduce or avoid damage to the equipment and the power of the adjacent areas. Protection device must have four basic properties: sensitivity, reflecting the ability of failure, usually expressed sensitivity coefficient. Reliability, in the action, refuse to move does not occur. Fast, the shortest time to failure or an exception will be eliminated. Selective removal of the smallest possible range of failure, ensuring maximum ponent continued to troublefree supply. Select protection programs, in addition to the above four set will need to meet basic performance, we must also pay attention to the economy. Protection device that not only take into account the investment and operation and maintenance costs must also be considered imperfect because of device malfunction occurs, or refuse to move to the national economy and social life losses. 2 and the effect of transformer protection Gas Protection Gas protection measures of protection as the main transformer, which can reflect the failure of the transformer tank and the oil surface decreased. When a minor fault when the oil level will go down in the case, the light gas moves in the signal, the time when a serious fault, it will produce large amounts of gas, heavy gas will produce trip, tripped circuit breakers on each side of the main transformer. For some of the load voltage of the transformer with a voltage regulator device, generally set the load of gas, and the same reason, when the action occurs when the gas light will be given a certain signal, when the heavy gas movement occurs when the trip occurred phenomenon. Relay operated circuit breaker trip, do not immediately revert to the signal swap cards, but should check the protection action, and to identify the reasons for the elimination of transmission before recovery before all the cards out all the reset signal. Differential protection Transformer differential protection as the primary protection response and terminations of the white transformer winding faults, it can jump on each side of the transformer circuit breaker. The recurrent protection voltage lockout Complex pressure response to the external phase lock overcurrent protection can be caused by a short overcurrent and as a gas, differential protection of the reserve. Action on the trip. The current and voltage transformer protection Changing external electrical fault occurred, resulting overcurrent transformer winding, and an internal fault in the transformer when the gas as a backup protection and differential protection, the transformer should be installed overcurrent protection. And according to the system shortcircuit current and transformer capacity of different, you can choose different protection methods, including lowvoltage start over current protection, over current protection, negative sequence overcurrent protection. 3 characteristics of power transformer relay protection system High reliability Information management system in substation relay protection, high reliability, because it uses methods of data warehouse and database, to facilitate system maintenance and upgrades. The entire information management system is no longer in operation prior to transmission to the distributed users at all levels, but concentrated in the center of the network database and rule base. Even if one of the customer39。在變壓器繼電保護研究的道路上，人們依然要繼續(xù)去探索繼續(xù)驗證，相信隨著新的控制理論的出現(xiàn)和繼電器技術的發(fā)展，變壓器繼電保護裝置在電力系統(tǒng)中的應用將會越來越來重要。（1）繼電器的額定電壓220V，觸點形式為二動合三轉換。（7）功率消耗在額定電壓下，繼電器的功率消耗為35VA。（9）動作可靠性，繼電器的動合觸點應無抖動地閉合；，繼電器的整定值在刻度盤的中值時，繼電器的動斷觸點應可靠閉合，動合觸點應可靠斷開。（4）動作特性繼電器直流助磁特性e=f(k)可以用改變短路繞組匝數(shù)的方法進行分階調(diào)整。當電源斷開時，銜鐵被返回彈簧頂回原位，同時扇形齒曲臂亦被銜鐵頂回原處，并使鐘表彈簧重新拉伸，以備下次動作。表 保護定值清單項目動作值動作時限變壓器瓦斯保護氣體容積整定為300cm179。（1）躲過并列運行中切出一臺變壓器時所產(chǎn)生的過負荷電流。（3）確定BCH—2型差動繼電器各線圈的匝數(shù)。 （6）繼電器和保護裝置的直流工作電壓，應保證在外部電源為80%～115%額定電壓條件下可靠工作。遠后備是當主保護或斷路器拒動時，由相鄰電力設備或線路的保護實現(xiàn)后備。（3）對三側有電源側電源的三繞組升壓變壓器，三側均裝。 要實現(xiàn)雙繞組變壓器的縱聯(lián)差動保護，必須適當選擇兩側電流互感器的變比。變壓器油箱內(nèi)發(fā)生的任何一個故障時，由于短路電流和短路點電弧的作用，將使變壓器油及其他絕緣材料因受熱而分解產(chǎn)生氣體，因氣體比較輕，它們就要從油箱里流向油枕的上部，當故障嚴重時，油會迅速膨脹并有大量的氣體產(chǎn)生，此時，回游強烈的油流和氣體沖向油枕的上部。根據(jù)系統(tǒng)最小負荷的需要，電力系統(tǒng)中的發(fā)電設備都投入相應的發(fā)電設備且系統(tǒng)中性點只有少部分接地的運行方式為最小運行方式。其故障對供電可靠性和系統(tǒng)安全運行帶來嚴重影響，同時大容量的電力變壓器本身也是十分貴重的設備。因此根據(jù)變壓器容量和電壓等級及其重要程度，裝設性能良好、動作可靠地繼電保護。繼電保護中，通過保護的短路電流為最小運行方式。利用油箱內(nèi)部的故障時的這一特點，可以構成反映氣體變化的保護裝置，稱之為瓦斯保護.800千伏安及以下的油浸式變壓器，應裝設瓦斯保護。因此，在變壓器縱聯(lián)差動保護中，要實現(xiàn)兩側電流的正確比較，必須先考慮變壓器變比的影響。（4）對于雙繞組降壓變壓器，裝于高壓側。 近后備是當主保護拒動時，由該電力設備或線路的另一套保護實現(xiàn)后備的保護；當斷路器拒動時，由斷路器失靈保護來實現(xiàn)的后備保護。 （7）對220kV～500kV斷路器三相不一致，應盡量采用斷路器本體的三相不一致保護，而不再另外設置三相不一致保護；如斷路器本身無三相不一致保護，則應為該斷路器配置三相不一致保護。該繼電器在保持時，其基本動作安匝為安匝，據(jù)此計算35kV側工作線圈的計算匝數(shù)為： ===選用實用整定匝數(shù)6匝為了平衡得更精確，使不平衡電流影響更小，可將基本側平衡線圈作為動作匝數(shù)的一部分，基本側的工作線圈匝數(shù)等于差動線圈和平衡線圈之和，選取差動線圈與平衡線圈的整定匝數(shù)匝，=5匝，=1匝。兩臺變壓器容量相同，則另一臺變壓器的最大負荷電流為：==2=2====