兆伏特×安培=兆瓦特。 M=兆=10^6=1000000. 扩展资料： 1MW=1000KW=1000000W. 千瓦 (Kilowatt)，早期为电的功率单位，现在有延伸为整个物理学领域功率单位的趋势。 在电学上，千瓦时 (Kilowatt-hour)与度完全相等，只是称谓不同。 1 千瓦 = 1,000 瓦特 (Watt) = 1000 焦耳 (Joule)/秒 (Second)。 1 千瓦 = 1,000 牛顿·米/秒 (N·m/s) 1 千瓦 = 0.239千卡/秒 (kcal/s) 1 千瓦 = 1.36 马力. 瓦特是国际单位制的功率单位。 瓦特的定义是1焦耳/秒（1J/s），即每秒转换、使用 …

2011年7月5日 · 对三相变压器而言，额定容量等于=3×额定相电压×相电流，额定容量一般以kVA或MVA表示。 而实际输出容量为有负载时的电压 (感性负载 时，负载时电压小于额定空载电压)、额定电流与相应系数的乘积 。 而千瓦是指一个电器的功率的，也就是功率的单位了。 额定容量表示在额定工作条件下变压器输出功率的保证值，是变压器的 视在功率。 即变压器输出最大电功率的能力，不能将变压器的实际输出功率与容量相混淆。 单位为伏安（VA）、千伏安（kVA）、 …

2018年7月21日 · To convert short circuit current to MVA: Where, Vll is the line-line voltage and Vln is the line-neutral voltage at which short circuit value is provided. X/R ratio is the ratio of inductance to resistance of the power grid up to the point of fault. Near to large generating stations and large substations, this ratio will be high.

2019年1月23日 · MVA表示视在功率,它包含了无功功率和有功功率, 用英文字母表示为S。 视在功率就是电压与电流之积，三相交流电路中就是根号3倍线电压、线电流之积,它的大小和功率因数有关。 在交流电路中，我们将正弦交流电电路中电压有效值与电流有效值的乘积称为视在功率，即S=UI视在功率不表示交流电路实际消耗的功率，只表示电路可能提供的最大功率或电路可能消耗的最大有功功率。 视在功率反映了系统的总容量，由于配电系统中既有阻性的有功功率.也有感 …

There are four base quantities: base MVA, base KV, base ohms, and base amperes. When any two of the four are assigned the other two can be derived. It is common practice to assign study base values to MVA and KV. Base amperes and base ohms are then derived for each of the voltage levels in the system.

2011年11月7日 · Z = V^2/MVA so knowing MVAsc, Vsys, and X/R you can determine the other values needed for calculations. Doing a little quick math you can easily see how the increase in X/R, i.e. X greater than R, affects the impedance Z. Say if …

2024年12月19日 · Discover the meaning of MVA in electrical terms, referring to megavolt-amperes. Learn how MVA ratings indicate transformer capacity and apparent power in power plants.

2020年10月7日 · Reduce MVA diagram into a single short-circuits MVA value at the point of fault to find SC MVA and SC Current values. 1. Short Circuit MVA and Short Circuit Current Calculation for Fault F1:

2024年12月27日 · What is MVA in electricity and how is it different from MW? MVA stands for Megavolt-Amperes which is apparent power in electrical systems. It embodies all the power in a circuit, active power mw (Mega Watts) and reactive power (measured in Megavars MVAR).

2023年4月4日 · This post will present the methodology of MVA Method in performing short circuit calculation. The result will be compared to the Impedance Method of Short-Circuit Calculation and the Per Unit Method later in the article.

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该工具涵盖了国际标准中的多种视在功率单位，如伏安 (VA)、千伏安 (kVA)、兆伏安 (MVA)等，用户只需输入数值和原始单位，即可快速获得目标单位下的转换结果。 这款工具凭借其简单易用的界面设计和强大的后台算法，极大地简化了工程师、科研人员以及学生在处理电力系统相关问题时进行单位换算的工作流程。 二、如何使用. 在工具页面中，有一个输入框供您输入待转换的视在功率数值，旁边则是可供选择的原始单位列表，例如“伏安”或“千伏安”。 选定原始单位后，在目标 …

Each basic component within the industrial electrical distribution system is pre-assigned a single short circuit MVA factor (SC MVA) based on the impedance it adds to the system. Generators, motors, transformers are normally given their own rated MVA, X/R ratios and impedance ratings [ typical X/R and impedance ratings ].The short circuit MVA ...

The Complex MVA Method provides an easy way to determine the X/R values for a power system study. The Complex MVA Method will be dealing with complex values but it will be much easier than using the Per Unit Method because no base transformation is necessary.

Cumpute the three-phase fault MVA’s and fault currents (in ampares, rms) for the following three-phase locations: 138 kV bus of the plant. 34,5kV bus of the plant. Determine the individual generator and system fault contributions is MVA during faults 1,2 and determine all transformer and line MVA flows as well.

Since the positive sequence fault is equal to negative sequence fault, MVA X1 = MVA X2 = 228. The zero sequence fault MVA, however, must be calculated, and its MVA value then is combined with the positive and negative MVA values. In our example, during a fault on the 12 kV bus only the transformer and the motor contribute to zero sequence MVA.

2013年3月11日 · In the MVA method, calculate the short circuit MVA of each element as if it was connected to an infinite bus. For a feeder with data given on a 100 MVA base, the MVAsc will be 100 MVA divided by the per unit impedance. MVAsc = MVA base/ Zpu. MVAsc = …

The 1500 MVA power supply is merely given a short circuit MVA rating. Sometimes, if the system MVA is not available, but its voltage and impedance are given, the short circuit MVA can be calculated by MVA SC = KV 2 * Y formula. The very same formula is used to calculate the short circuit MVA rating of the 69 kV X=3.87 Ohm cable.

2017年8月7日 · Find the total power delivered by the power distribution system in Megavolts-amperes or "MVA." Use the formula MVA = MW/pf where MW is the megawatt value of the system. For example, if MW is 20MW and pf is 0.8: MVA = 20/0.8 = 25 MVA. Calculate 3 phase amps, or "I", using the formula: I = (MVA x 1,000, 000)/ (Vphase x 1.732).

The problem will be solved using the MVA method implemented in the online short circuit calculator presented on this web-site. Fault current values at nodes a) to j) need to be calculated. The resulting short circuit current values will be compared with the respective values produced by ESA Easypower 7.0.