SU111068A1 - Device for measuring electrical energy loss in a corona in a loaded high-voltage power line - Google Patents

Description

Measuring the energy losses going to the corona on the acting (loaded) transmission line by conventional methods is more difficult, since the energy to be determined is usually much less than the energy transmitted along the line and in a number of cases is several times less than the energy loss from the active line wire resistance.

The proposed device makes it possible to overcome these difficulties, since it makes it possible, instead of measuring the sum of all the powers transmitted along a line, to measure only the power caused by losses per corona,

For this, the device uses a system of probes installed above the earth's surface parallel to the phase conductors of the power line and grounded at their midpoints (along the length) through measuring elements at which voltages are induced, proportional to the total charge of all three phases of the line. By these voltages, electrical quantities are proportional to the multiplying circuit, which are proportional to the total charges of the individual wires of the corona line.

Capacitors or active resistances can be used as measuring elements in this device.

The drawing shows a block diagram of the proposed device.

The measurement of the phase voltages of the three-phase lines L, B and C is carried out in the usual manner using measuring transformers or voltage dividers 1A, 1B and 1C. To measure the total charge of the phases, a system of three probes 3, 3h and 5h, arranged parallel to the wires of the line at the earth's surface, was used. In order to eliminate the electromagnetic effect of the longitudinal currents of the line on the probes, the latter are grounded exactly at their midpoints (in length) through the measuring elements of the capacitances Cj, Cr, Cz or active resistances. When working, is # П1068-2 -

The scientific research institutes on these measuring elements induce voltages proportional to the charges of the probes (in the case of application of capacities) or their time derivatives (in the case of application of active resistances).

To determine the total phase charges, the voltages induced in the measuring elements must be multiplied by some constant coefficients characterizing the relationship between the total phase charges (charges of the phase wires plus corona-induced volume charges) and the charges . This is accomplished by elements 2A, 2B, 2C and 3A, 3B, 3B, and 3C of multiplying-summing circuit.

In elements 4A, 4B, and 4C of a multiplying-summing circuit for voltages or currents coming from elements FOR, ЗВ and ЗС, and phase voltages measured by elements / Л, 1В and 1C, the powers are determined by phase, which are then summed by element 5. As a result, the crown loss power is creeping along a line segment equal to the length of the probes.

Subject invention

Claims (3)

1. A device for measuring the electrical energy loss to the corona in a loaded high-voltage transmission line, characterized in that, in order to extract the power consumed by the corona from the total power transmitted through the line, it uses a system of probes installed over a surface the phase conductors of the power line and grounded at their midpoints in length, through measuring elements on which voltage is applied, proportional to the total charge of all three phases of the lines, and multiplying the Hema, through which are electrically isolated quantities proportional to give a full charge corona wires separate line. 2.In the device by. 1 application as measuring elements capacitors. 3. In the device according to claim 1, use as measuring elements of active resistances.