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tea0sky新蟲 (初入文壇)
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[交流]
和斷路器有關(guān)的一段翻譯啊，哪位好心人幫幫忙吧，我把所有的金幣都給你啦~~
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Power circuit breakers play the most important role in pre- serving the stability of power networks and in decreasing the induced damages to power system utilities in the case of any fault. Therefore, the determination of their interruption capability limits seems to be necessary to be able to predict whether different faults can be cleared. Most of failures occur in gas circuit breakers originate from a soft thermal collapse of the gas insulation within less than microsecond after cur- rent zero; the so-called thermal reignition, due to the increase in the conductivity of the rest plasma resulted from the flowof the post-arc current produced by application of the initial transient recovery voltage to the breaker. The density of the rest plasma is dependent on the cur- rent fall rate before current zero, and the post-arc current responsible for heating up the plasma is controlled by the conductivity of the rest plasma and the applied voltage. So, it can be concluded that the thermal reignition is strongly dependent on the rate of decrease in the current before cur- rent zero as well as on the rate of increase in the recovery voltage [1, 2]. As the result to evaluate the limits of the interruption capability of the circuit breakers, different currents and voltage have to be applied to the circuit breaker. Some efforts have been accomplished to perform some test related to thermal reignition using a full synthetic test method [3, 4]. In some other studies, a characteristic of the interruption capability in terms of the time derivative of the current and rate of increase in the applied voltage has been established [5, 6]. The presence of an auxiliary breaker (AB) in a synthetic circuit is unavoidable. As the AB opens during the current flow through the test breaker, the voltage of the high current source is divided between AB and test breaker resulting in a reduction of the arc energy in test breaker as addressed in [7]. Also the distortion of the current waveshape near cur- rent zero makes the evaluation of the limits of the thermal interruption capability of the circuit breakers erroneous. |
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lxuyan
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sirljz(金幣+3):謝謝交流 2010-05-01 22:26
tea0sky(金幣+1, 翻譯EPI+1):謝謝你啦~ 2010-05-02 10:12
sirljz(金幣+3):謝謝交流 2010-05-01 22:26
tea0sky(金幣+1, 翻譯EPI+1):謝謝你啦~ 2010-05-02 10:12
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電源斷路器在電網(wǎng)的穩(wěn)定性方面和降低引起損害的電力系統(tǒng)的故障方面，扮演著很重要的作用。因此,檢測(cè)其中斷容量的限制范圍似乎是很有必要的,能用來預(yù)測(cè)是否可以修復(fù)不同的電路故障。大多數(shù)故障發(fā)生在天然氣斷路器，它在電流為零后微秒級(jí)之內(nèi)會(huì)伴隨著一個(gè)柔軟的氣體絕緣導(dǎo)熱體的坍塌;所謂的熱再引弧電壓,是由于導(dǎo)電性的等離子體而產(chǎn)生的弧后電流流量，導(dǎo)致所產(chǎn)生的瞬態(tài)恢復(fù)應(yīng)用的電壓開關(guān)。 剩余的等離子體密度取決于電流在變成0之前的電流降低速率。還有可以通過控制剩余等離子體和外加電壓的導(dǎo)電性來實(shí)現(xiàn)弧后電流對(duì)等離子的升溫。所以,我們可以得出這樣的結(jié)論：熱再引弧依賴于在電流變成0之前的電流的降低速率和電壓的恢復(fù)速率[1,2]。 所以，為了評(píng)估斷路器的極限，必須用不同電流和電壓來試驗(yàn)這個(gè)斷路器。某些人已經(jīng)努力完成了這樣的工作，用全人工綜合測(cè)試方法來檢測(cè)一些關(guān)于再引弧電壓的試驗(yàn)[3，4]。還有人建立了一個(gè)模型，關(guān)于電流的時(shí)間導(dǎo)數(shù)和外加電壓的增加速率來描述斷路器的特性[5,6]。如文獻(xiàn)[7]所述，輔助開關(guān)(AB)在一個(gè)綜合電路中是不可缺少的。因?yàn)锳B可以通過測(cè)試斷路器來控制電流流量，而且高電流源的電壓可以平均分配在AB和測(cè)試斷路器間，所以可以在測(cè)試斷路器的時(shí)候來降低電弧能量。在電流接近0時(shí)，失真電流波形可以評(píng)估電路斷路器錯(cuò)誤的熱熔斷的極限范圍。 [ Last edited by lxuyan on 2010-5-1 at 17:58 ] |
2樓2010-05-01 17:25:39
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