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為了確定裝置中的短路電流，應(yīng)考慮故障點(diǎn)以及大化涉及裝置的短路電流的系統(tǒng)配置。如適用，應(yīng)考慮電機(jī)的貢獻(xiàn)。例如，在下文詳述的情況下，對(duì)于斷路器CB1，壞的情況發(fā)生在故障位于斷路器本身的正上游時(shí)。為了確定斷路器的開(kāi)斷能力，必須考慮兩個(gè)并聯(lián)變壓器的貢獻(xiàn)。CB1的右下游故障CB1的右上游故障（CB1的壞情況）一旦確定了故障點(diǎn)處的短路功率當(dāng)量，可以使用以下公式計(jì)算短路電流：三相短路兩相短路6.3.3計(jì)算短路電流以確定裝置中的短路電流，應(yīng)考慮故障點(diǎn)和系統(tǒng)配置，以大化涉及裝置的短路電流。如適用，應(yīng)考慮電機(jī)的貢獻(xiàn)。例如，在下文詳述的情況下，對(duì)于斷路器CB1，壞的情況發(fā)生在故障位于斷路器本身的正上游時(shí)。為了確定斷路器的開(kāi)斷能力，必須考慮兩個(gè)并聯(lián)變壓器的貢獻(xiàn)。CB1的右下游故障CB1的右上游故障（CB1的壞條件）6.3短路電流的確定：“短路功率法”492電氣設(shè)備| ABB 6短路電流的計(jì)算SkEL Ik SkUP SkUP=°SkUP=1000 MVA SkUP=750 MVA SkUP=500 MVA SkUP=250 MVA SkUP=100 MVA SkUP=50 MVA SkUP=40 MVA SkUP=30 MVA SkUP=20 MVA SkUP=10MVA SkEL[MVA]Ik[kA]0 10 20 30 50 60 70 80 90 100 120 130 150 0 10 20 30 40 60 80 90 100 1SDC010052F0001作為一級(jí)近似值，通過(guò)使用下圖，可以評(píng)估已知短路功率（SkEL）的物體下游的三相短路電流；與該值對(duì)應(yīng)，在知道物體上游短路功率（SkUP）的情況下，可以在y軸上讀取Ik的值，以kA表示，電壓為400 V。圖1：三相短路計(jì)算圖

To determine the short-circuit current in an installation, both the fault point as well as the configuration of the system which maximize the short-circuit current involving the device shall be considered. If appropriate, the contribution of the motors shall be taken into account. For example, in the case detailed below, for circuit-breaker CB1, the worst condition occurs when the fault is right upstream of the circuit-breaker itself. To determine the breaking capacity of the circuit-breaker, the contribution of two transformers in parallel must be considered. Fault right downstream of CB1 Fault right upstream of CB1 (worst condition for CB1)Once the short-circuit power equivalent at the fault point has been determined, the short-circuit current can be calculated by using the following formula: Three-phase short-circuit Two-phase short-circuit 6.3.3 Calculation of the short-circuit current To determine the short-circuit current in an installation, both the fault point as well as the configuration of the system which maximize the short-circuit current involving the device shall be considered. If appropriate, the contribution of the motors shall be taken into account. For example, in the case detailed below, for circuit-breaker CB1, the worst condition occurs when the fault is right upstream of the circuit-breaker itself. To determine the breaking capacity of the circuit-breaker, the contribution of two transformers in parallel must be considered. Fault right downstream of CB1 Fault right upstream of CB1 (worst condition for CB1) 6.3 Determination of the short-circuit current: “short-circuit power method” 492 Electrical devices | ABB 6 Calculation of short-circuit current SkEL Ik SkUP SkUP = ° SkUP = 1000 MVA SkUP = 750 MVA SkUP = 500 MVA SkUP = 250 MVA SkUP = 100 MVA SkUP = 50 MVA SkUP = 40 MVA SkUP = 30 MVA SkUP = 20 MVA SkUP = 10 MVA SkEL [MVA] Ik [kA] 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 0 10 20 30 40 50 60 70 80 90 100 1SDC010052F0001 As a first approximation, by using the following graph, it is possible to evaluate the three-phase short-circuit current downstream of an object with short-circuit power (SkEL) known; corresponding to this value, knowing the short-circuit power upstream of the object (SkUP), the value of Ik can be read on the y-axis, expressed in kA, at 400 V. Figure 1: Chart for the calculation of the three-phase short-circuit