Evaluation method of impact of direct launching of 10kV large power motor on running voltage of power distribution network
A technology for operating voltage and distribution network, which is applied in the field of measurement and evaluation of operating voltage impact of distribution network, can solve the problems of standard motor access and operation requirements without substantial reference value, etc., and achieve safe operation and planning convenience and robustness. strong effect
Active Publication Date: 2013-05-22
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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These statements have no substantial reference value for standardizing motor access and operation requirements
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[0027] A method for evaluating the impact of a 10kV high-power motor directly starting on the operating voltage of a distribution network of the present invention comprises the following steps:
[0028] (1) Obtain the rated capacity P of the 10kV high-power motor and the motor in the distribution network mN , total line load ∑P i , Distribution line sending terminal voltage E, voltage V measured when the motor access point is in normal operation M and the total current I at the sending end of the line B the value of each parameter;
[0029] (2) The parameters obtained through step (1) adopt the motor impact factor MIF (motor impacting factor), that is: the percentage of the rated power of the motor in the total load of the distribution network line and the short-circuit capacity S of the 10kV motor connected to the busbar ac To measure the impact of the 10kV motor direct start on the operating voltage of the distribution network, the calculation formula of the motor impact ...
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The invention discloses an evaluation method of impact of direct launching of a 10kV large power motor on a running voltage of a power distribution network. The method of the impact of the direct launching of the 10kV large power motor on the running of the power distribution network comprises steps: step one: obtaining rated capacity PmN of the 10kV large power motor and a motor of the power distribution network, total load of a line sigma Pi, voltage E of the sending end of the power distribution line, measuring voltage VM during normal running of the access point of the motor and values of parameters of the total current IB of the sending end of the line; step two: adopting the impact coefficient MIF of launching of the motor to measure the effect of the direct launching of the 10kV motor on the running voltage of the power distribution network; step three: according to the motor impact coefficient MIF obtained at the step two, evaluating the impact of the direct launching of the 10kV large power motor on the running voltage of the power distribution network. The evaluation method of the impact of the direct launching of the 10kV large power motor on the running voltage of the power distribution network comprehensively considers effect of the launching of the 10kV motor to the running voltage of the power distribution network when the motor volume, the access position and the system intensity are different and is capable of displaying the evaluation of the impact of the launching of the large power motor in a quantizing mode.
Description
technical field [0001] The invention relates to a method for evaluating the operating voltage impact of a distribution network, in particular to a method for evaluating the impact of a 10kV high-power motor directly starting on the operating voltage impact of the distribution network. Background technique [0002] With the expansion of my country's industrialization scale, the application of large AC asynchronous motors is becoming more and more common. The poor starting and speed regulation performance of AC asynchronous motors has always been a problem that operators are very concerned about. The start of an asynchronous motor refers to the entire process of accelerating from a standstill to a steady speed. If it is started directly at the rated voltage, the starting current is very large, the rotor power factor is very low, and the starting torque is not large, generally only 0.7 to 1.1 times the rated torque. The starting characteristics of the induction motor are not ...
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IPC IPC(8): G01R31/34
Inventor 刘石生毛晓明
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID