RU2212744C2 - Device for measuring ice and wind loads, including wind direction monitoring, on overhead power transmission lines - Google Patents

Abstract

FIELD: early ice detection, prediction of wire dancing, and selection of ice melting intervals on overhead power transmission lines. SUBSTANCE: proposed device that can be used on disconnected wires carrying light load to simultaneously measure and monitor ice and wind loads and also wind direction has magnetoelastic force sensors suspended between suspension-tower cross-arm and insulator strings with phase conductors; first insulator string is secured to tower on both ends, second string, on one end, and third one, on opposite end with aid of hinged insulating braces; these force sensors function to check, respectively, ice load, full load with wind direction on one side, and full load with wind direction on other side. Paired connection of first and second as well as first and third magnetoelastic sensors to three telemetering channels incorporating measuring instruments through nonlinear transducers and first sensor, directly to these channels provides for measuring wind load at wind direction from left to right across line by first of these channels, wind load at wind direction from right to left, by second channel , and ice load only, by third channel. EFFECT: enlarged functional capabilities. 1 cl, 3 dwg

Description

 The invention relates to the electric power industry and can be used for early detection of ice formation, prediction of “dancing” of wires and selection of the order of melting ice on the wires of overhead power lines.

 Known devices for continuous monitoring of icy load on overhead power lines with a force measuring element made in the form of a magnetoelastic sensor suspended between the support beam and a string of insulators [1 and 2].

 The disadvantage of these devices is that they control the full load on the overhead line, both icy and wind, and the need for detuning from the wind load makes it difficult to timely (early) detect icing and make decisions on organizational and technical measures, in particular melting ice on electric current preventing ice accident.

 A device is known for discrete monitoring of icing load on overhead power lines with a force measuring element - an icing load sensor, in which false alarms during wind loads are eliminated by fixing it in a special articulated lever system made of two chains, each of which consists of successive links pivotally interconnected [3].

 The disadvantage of this device is the inability to control wind load, which is necessary to predict icing and "dancing" of the wires.

 It is known "Device for measuring ice and wind loads on overhead power lines" [4], which is the closest analogue (prototype). The device comprises a magnetoelastic force sensor suspended between the support beam and a string of insulators with a phase wire and connected through the first block of signal amplitude separation to the first inputs of the first and second nonlinear converters having two inputs, and the output of the first nonlinear converter is connected to the first through the first television transmission channel measuring device, the output of the second non-linear converter through the second channel of the television transmission is connected to the second measuring device.

 The device simultaneously measures separately ice and wind loads and provides early detection of ice formation and prediction of "dancing" of wires on overhead power lines.

 The disadvantage of this device is the use of two magnetic current transformers connected through additional blocks of summation and division to the second inputs of the first and second nonlinear converters. There are no signals from magnetic current transformers in the absence of current in the overhead power line, so the device does not measure the wind load of disconnected or lightly loaded overhead power lines and directly in the process of melting ice with direct current.

 Another disadvantage of this device is the lack of control of the direction of the wind, which is necessary to select the order of melting ice, which prevents overlapping wires of the overhead power line.

 The claimed invention is aimed at solving the problem of early detection of icing and prediction of "dancing" of wires on overhead power lines, including disconnected, lightly loaded and when melting icing with direct current, as well as monitoring the direction of the wind and is a device for simultaneously measuring separately icing and wind components loads with wind direction control.

 The specified technical result is ensured by the fact that in a device containing a first magnetoelastic force sensor suspended between a support traverse and a string of insulators with a first phase wire and connected through the first signal amplitude extraction unit to the first inputs of the first and second nonlinear converters having two inputs, and the output of the first nonlinear converter through the first channel of the telecast is connected to the first measuring device, the output of the second nonlinear converter through the second channel of the telecast and connected to the second measuring device, additionally introduced the second and third magnetoelastic force sensors suspended between the traverse of the support and, accordingly, a string of insulators with a second and third phase wires and connected respectively through the second and third signal amplitude isolation blocks to the second inputs of the first and second nonlinear converters, as well as a third measuring device connected through the third channel of the television transmission to the output of the first signal amplitude extraction unit, and a string of insulators with rvym phase conductor is fastened to the support on both sides of hinged-lever system formed of insulating spacers, and the insulator string with the second and third phase conductors are fixed to the support respectively on the one and on the other hand hinged to the insulating spacers.

 The essence of the claimed invention is illustrated by the functional diagram of the device shown in figure 1, and the installation diagram of magnetoelastic force sensors and fixing the strings of insulators with insulating spacers, shown in figure 2; figure 3 shows a diagram of a nonlinear Converter.

 The device in figure 1 contains a first magnetoelastic force sensor 1 connected through a first block for extracting the signal amplitude 2 to the first inputs (1) of the first and second nonlinear transducers 3 and 4, each having two inputs (1) and (2), the output of the first nonlinear the transducer 3 through the first channel of the telecast 5 is connected to the first measuring device 6, the output of the second nonlinear transducer 4 through the second channel of the telecast 7 is connected to the second measuring device 8. The second and third magnetoelastic force sensors 9 and 10 through the second and third bl The amplification extraction windows of the signal 11 and 12 are connected to the second inputs (2) of the first and second nonlinear transducers 3 and 4. The third measuring device 13 is connected to the output of the first signal amplitude extraction unit 2 through the third TV channel 14.

 Figure 2 shows the installation diagram of magnetoelastic force sensors 1, 9, 10 between the yoke of the intermediate support 15 and the garlands of insulators 16, 17, 18, supporting phase wires 19, 20, 21. A garland of insulators 16 with a phase wire 19 is fixed to the support with two the sides of the articulated lever system made of insulating spacers 22 and 23; a string of insulators 17 with a phase wire 20 is fixed to the support on one side (on the right) with pivotally connected insulating spacers 24; a string of insulators 18 with a phase conductor 21 is fixed to the support on the other side (left) with pivotally connected insulating spacers 25. The sag of the pivotally connected insulating spacers 22, 23, 24, 25 should not exceed 0.15 of the length of these spacers. The parameters of the insulating spacers are given in [5]. The dashed lines show the position of the string of insulators 17 ', phase wire 20' and insulating spacers 24 'when the wind is from left to right. The position of other strings of insulators and phase conductors is practically unchanged.

 In FIG. 3 shows a diagram of a nonlinear converter 3 or 4 having two inputs (1) and (2), two squaring blocks, a summing element and a square root extraction block.

 The device operates as follows.

 In the absence of a wind load, the full load is equal to glaze (together with the weight of the string of insulators and phase conductor). The voltage at the output of the magnetoelastic force sensors 1, 9, 10 and signal amplitude extraction blocks 2, 11, 12 are approximately the same and proportional to the ice load, therefore, the voltage at the output of the first and second nonlinear transducers 3 and 4 are close to zero, therefore, the readings are close to zero the first and second measuring devices 6 and 8, and the readings of the third measuring device 13 are proportional to the icing load - the total icing load detected by the magnetoelastic force sensor 1 and transmitted through blocks 2 and 14, without constant constant component proportional to the weight of the insulator string and the phase conductor.

 In the presence of a wind load from left to right across the overhead power line, as shown in figure 2, the axis of the string of insulators 17 deviates to position 17 ', and the position of the axes of the string of string insulators 16 and 18 is practically unchanged, since the wind load is balanced by the tension of the articulated insulation spacers 22 and 25. The voltage at the output of the magnetoelastic force sensor 9 and the signal amplitude extraction unit 11 is proportional to the total load, which is equal to the square root of the sum of the squares of the ice load (together with the weight garlands of insulators and phase wires) and wind load, and the voltage at the outputs of force sensors 1 and 10 and blocks 2 and 12 is proportional to the ice load (together with the weight of the garland of insulators and phase wire). Therefore, the voltage at the output of the nonlinear converter 3 transmitted through the first channel of the telecast 5, and the readings of the first measuring device 6 are proportional to the wind load from left to right. The reading of the second measuring device 8 is close to zero, and the reading of the third measuring device 13 is proportional, as in the absence of wind, to an ice load.

 When the wind load from right to left, the reading of the second measuring device 8 is proportional to the wind load, the reading of the first measuring device 6 is close to zero, and the reading of the third measuring device 13, as in previous cases, is proportional to the ice load. Measuring only the icing load by the third measuring device 13, and not the full load, provides the possibility of early detection of icing and timely decision-making on organizational and technical measures, in particular melting of icing by electric current, preventing icing accident.

 Measurement of wind load and wind direction with measuring instruments 6 and 8 (6 - from left to right, 8 - from right to left) is used to predict icing, "dancing" of wires and selecting the order of melting of ice, which prevents overlapping wires of an overhead power line.

 The operation of the device does not depend on the current load of the overhead power line, so the device functions correctly on disconnected and lightly loaded overhead power lines and directly in the process of melting ice with direct current.

Sources of information
1. A.S. 1173473 (USSR). Icing sensor / A.P. Kostenko, Yu.S. Milsky and others // 08.15.85. Bull. thirty.

 2. A. S. 1539885 (USSR). Device for controlling ice load on wires or cables of power lines. / Yu.I. Lyskov, V.S. Molodtsov, M. M. Seredin // 30.01.90. Bull. 4.

 3. A. S. 938345 (USSR). Device for hanging wires of power lines. / V.G. Kagan, V.Kh. Ishkin // 06/23/82. Bull. 23.

 4. Patent for invention 2145758. Device for measuring ice and wind loads on overhead power lines. / I.I. Levchenko, A.S. Zasypkin, A.A. Alliluyev, A.V. Lubenets // 02.20.2000. Bull. 5.

 5. Alexandrov G.N. Ultra-high voltage installations and environmental protection. - L .: Energoatomizdat, 1989 .-- 360 p.

Claims (1)

 A device for measuring ice and wind loads with monitoring the direction of the wind on overhead power lines, comprising a first magnetoelastic force sensor suspended between a support beam and a string of insulators with a first phase wire and connected through the first signal amplitude extraction unit to the first inputs of the first and second non-linear converters, having two inputs, and the output of the first non-linear converter through the first channel of the television transmission is connected to the first measuring device, the output of the second non-linear A different transducer is connected to a second measuring device through a second television transmission channel, characterized in that a second and third magnetoelastic force sensors are suspended, suspended between the support beam and, respectively, a string of insulators with second and third phase wires and connected respectively through the second and third amplitude isolation units the signal to the second inputs of the first and second non-linear converters, as well as a third measuring device connected through the third channel of the television transmission to the output at the first block of extraction of the signal amplitude, and the string of insulators with the first phase wire is fixed to the support on both sides by a hinged-lever system made of insulating spacers, and the string of insulators with the second and third phase wires are fixed to the support, respectively, on one and the other side articulated insulation spacers.

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