RU1786590C - Method of determination of characteristics of losses of power to corona in electric power line - Google Patents

Abstract

SUMMARY OF THE INVENTION: on a line model, the voltage in the intermediate nodes of the power line is determined, the voltage is changed from the original as many times as the sections of the line are monitored. Then, the average voltage of the sections in each of the modes and the crown loss for the entire line in each of the modes are determined; from the data obtained, the derivative of the crown loss by voltage for each of the sections is determined, and from the values of the derivatives, the crown loss for each of the sections and the weather types for them are determined. 1 ill.

Description

In these equations all the parade PK1 to PK2 meters are known except m and -dtt-. which can

be determined by solving a system of equations. Then, from the type functions, the types of weather in the sections and the corona intensities corresponding to them are determined as an inverse problem.

The drawing shows a structural diagram implementing this method.

The circuit contains blocks 1 and 2, measuring the parameters of the mode of the beginning and end of the line, block 3, modeling the line by sections in good weather, block 4, which determines the difference between the measured power at the end of the line and the same value obtained on the model, block 5 for statistical processing of the dependence of this difference on the power transmitted along the line, block 6 for setting the threshold of this difference (correction) that cannot be reached in good weather, block 7 for switching the information flow when the correction threshold is exceeded, block 8 summing the measured power of the end of the line with correction, block 9, subtracting from the difference between the power of the beginning of the line and the adjusted power of the end the load losses obtained on the model, block 10 for determining the average voltage of the line sections and block 11 for determining the derivative losses of the corona of the voltage sections, corona losses sites and types of weather for them.

In the initial static state, in good weather, the value at the output of the threshold element b does not exceed the threshold, there is no signal at the output 6, and the switch 7 is in the initial state. The magnitude of the load loss from block 3 through the switch 7 is fed to the first input 9, the other inputs receive data on the power at the beginning of the line from block 1 and the load loss from block 3. At the output of block 9, in good weather, there is no quantitative signal (loss to the crown at in good weather, practically no effect on the choice of voltage). When bad weather occurs, the threshold in block 6 is exceeded. At the output 6, a signal appears, switching the switch. At the same time, the corrected measured power of the end of the line arrives at the first input of block 9. The second input receives the measured power of the beginning of the line, and the third - load losses from block 3. After subtracting from the total losses received in block 9, the load losses at the output of block 9, the amount of losses per crown is transmitted to the block; eleven.

In order to determine the weather and the intensity of the corona, the voltage level is varied in sections. There should be as many voltage modes as there are plots. The average voltage values of the plots are determined by block 11 based on model data

(the corona and the associated active power mode affect the voltage slightly).

Crown loss derivatives and site weather types are determined as a result of

solving equations (1).

Claims (1)

SUMMARY OF THE INVENTION A method for determining characteristics of power losses per crown on a power line, the method comprising: measure the active power at the beginning and at the end of the line, determine the difference between the indicated powers, measure the voltage at the ends of the line and determine the corona losses on the line from the measured parameters transmission line, characterized in that, in order to improve accuracy, determine the voltage at the intermediate points of the transmission line, change the voltage of the transmission line so many times how many sections of the line are monitored, with each voltage change, the aforementioned voltage measurement is carried out at the ends of the power line and at intermediate points for each measurement, average voltage values are determined for the sections of the power line, the losses per crown and the measured average voltage determine the change in losses on the crown and the change in average voltages over sections of the power line when the voltage of the power line changes, then determine the sensitivity of losses on the corona l of each of the line portions, which is determined by the type of weather for each of the areas and the loss on the crown for each of them.