85问答库 > 哪位大侠能帮我把这些翻译成英文，毕业论文要用，急啊~~多谢各位了,不要是机器翻译的啊

哪位大侠能帮我把这些翻译成英文，毕业论文要用，急啊~~多谢各位了,不要是机器翻译的啊

2025-03-04 23:21:28

推荐回答（1个）

回答1：

2.1 Variable ratio transformer
As the example of the vast majority of changes are more than 1.0, than to compare the effects of change were all set to change than 0.95,1 .0,1.05, assuming that changes in the high side than the other initial conditions with the classical method of calculating the settings the same results as shown in table 1.
Can be seen from Table 1, when the ratio increases, 500 kV power grid to reduce the short-circuit current, machine-side to increase the short-circuit current, 230 kV system is mixed. This is seemingly what the law, in fact, their conclusions are the same. As long as from the bus out to see an increase of ratio transformers, transformers slip will increase the equivalent impedance, short-circuit current will be reduced; the other hand, the equivalent impedance transformer slip will reduce short-circuit current will increase. 230 kV and 500 kV system in the step-down change and boost the local system changes the role of the plant, the short-circuit current changes may be mixed.
From table 1 can also see a significant change than the change on the impact of short-circuit current is relatively small, which, NUCPANT station the biggest changes in short-circuit current, and other changes in the plant stand is relatively small. This is due to the equivalent impedance NUCPANT station by connecting two points in this step-up transformation of the larger part of the company.
2.2 charging capacitance and the impact of shunt compensation
In addition to the trend based on the short-circuit current calculation, the short-circuit current calculation in general do not consider the line charging capacitance, high resistance lines, parallel low-voltage capacitors, reactors and other facilities affected. Table 2 gives the charging capacitance and parallel to consider whether or not compensation under the four combinations, the results of its short-circuit current changes in the calculation. Which, C, said capacitor charging circuit, S said node parallel compensation, not listed in the classic method of initial conditions and the same settings.
Can be seen from Table 2, consider the parallel compensation, changes in short-circuit current is relatively small and, given the parallel compensation, changes in short-circuit current rise and fall, which, if the dominant effects of capacitive compensation, short-circuit current to increase, on the contrary, decreased; consider charging capacitance, the short-circuit current changes in the larger; if taking into account the charge compensation capacitor and in parallel, the effects of the superposition of the two.
2.3 The value of the node voltage
Node voltage changes, voltage source based on the law of equivalent short-circuit current and voltage value calculated to maintain a linear relationship, therefore, are listed in Table 3 is only part of the calculation results of the node.
2.4 The output of generators and power factors
In the short-circuit current calculation, with the exception of the trend based on the calculation of the short-circuit current, the generator is set to empty normally, so the no-load generator potential and its the same terminal voltage. If the generator is loaded state, its power will more than no-load terminal voltage generators, and in the case of the same active power, lower power factor, load rate, the greater the current, the greater the potential no-load, failure short-circuit point higher bus voltage, so the greater the short-circuit current. Table 4 gives the change in power factor of generator short-circuit current calculation results of the impact of the conclusions of Table 4 coincide with the theoretical analysis.
2.5 Comparison of different calculation methods
In order to compare different method of calculating short-circuit current calculations of the impact of three selected representative set of initial conditions for the calculation.
(1) Based on the trend of short-circuit current calculation;
(2) the classic method of calculating short-circuit current;
(3) IEC recommended methods (ratio unchanged, the node voltage check 1.05pu).
Table 5 gives the short-circuit current under the three methods of calculation. Table, as the deviation of calculated values with the trend based on the calculation of the deviation.
Can be seen from Table 5, the classical method of calculation than the trend based on a small, but the results closer to those of IEC method of calculation based on the results of the trend, but there are still some large deviations from the node, and some small, some large and the grid does not reflect the actual level of short-circuit current.

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