SU1471142A1 - Method of fast determination of power loss due to corona discharge in power transmission lines - Google Patents

Abstract

This invention relates to the field of electrical measurements and is intended for use in electrical networks. The purpose of the invention is to improve the accuracy of determining the power loss per corona and reduce the cost of equipment and measuring equipment. The magnitude of the power loss to the corona is determined from the difference between the active component load currents of the transmitting and receiving ends of the line and the calculated voltage value at the conditional point of the corona current. The magnitudes of the active components of the corona current are determined using standard telemetry equipment. A device for implementing the method includes transformers 1 and 2 of current and voltage of the transmitting end, meters 3 and 4 of active power and voltage of the transmitting end, calculator 5, power line 6, transformers 7 and 8 of current and voltage of the receiving end, meters 9 and 10 active power and voltage receiving end. 1 il.

Description

The invention relates to the field of electrical measurements and can be used in high voltage electrical networks for the rapid determination of power loss per corona.

The purpose of the invention is to increase the accuracy of determining the power loss to the crown and reduce the cost of electrical equipment and measuring equipment.

The method is as follows. At both ends of the line, the synchronized voltage is measured and the active power fluxes from which the active components of the load current are determined, the value of the active component of the load current of the receiving end of the line being subtracted from the value of the active component of the transmitting end. This difference will be equal to the active current of the corona, since the magnitude of the leakage current is negligible.

On the basis of information on the mode parameters of the line, obtained from both its ends, the calculated value of the linear voltage at the conditional point of the corona current draining is determined. The indicated voltage is multiplied by the value of the active current of the corona, with the result that the value is equal to the loss of power per corona.

The drawing shows a structural diagram of the device that implements the proposed method.

The device contains a transmitting current transformer 1 end, a transformer end voltage transformer 2, a transmitting end active power meter 3, a transmitting end voltage meter 4, a calculator 5, a transmission line 6, a receive transformer current transformer 7 the receiving end, the active power meter 9 of the receiving end and the voltage meter 10 of the receiving end, moreover, the transformers 1 and 2 of the current and the voltage of the transmitting end are connected to the inputs of the measuring power 3 of the transmitting power and the transformer 2 of the voltage of the transmitting end, besides this, is connected to the input of the measurement 4 of the voltage of the transmitting to the transformer 7 and 8 of the current and the voltage 0

five

five

ABOUT

Neither the receiving end is connected to the inputs of the meter 9 of the active power of the receiving end, and the transformer 8 of the voltage of the receiving end is also connected to the input of the meter 10 of the voltage of the receiving end, the outputs of the meters 3 and 4 of the active power - and the voltage of the transmitting end and meters 9 and 10 of the active power and voltage of the receiving end are connected to the inputs of the calculator .5.

A device for carrying out a method for quickly determining the power loss per corona in a power line works as follows. Measuring instruments 3 and 4 of the active power and voltage of the transmitting end, and meters 9 and 10 of the active power and voltage of the receiving end produce discrete electrical signals proportional to the measured operating conditions of the line, and transmit them to the calculator 5, which produces power losses at crown:

,

 h

Where

1, and and - respectively the current of the corona and the voltage at the conditional point - its flow p

Claims (1)

Invention Formula The method of on-line determination of power losses per corona in power lines, which consists in measuring the parameters of the operating mode of the line and determining the current of the corona, characterized in that, in order to improve the accuracy of determining corona losses and reduce the cost of electrical equipment and measuring equipment , the voltages and active power fluxes at both ends of the line are synchronously measured, the active components of the load current are determined from them, the corona current is determined as the difference of the active components of the load current riemnogo end of the line and the values of the active component of the load current of the transmitting end, and the power loss at the crown is determined by multiplying the values of the corona current at the calculated value of line voltage in the conventional corona current point of runoff.