RU2668992C1 - INDICATOR OF OVERLAPPING OF INSULATORS OF OVERHEAD POWER LINES WITH A VOLTAGE OF 6-1150 kV - Google Patents

Abstract

FIELD: electric power engineering.SUBSTANCE: invention relates to the field of electric power industry and, in particular, to indicators of overlap of insulators (insulation structures) of overhead power lines with voltage 6÷1150 kV. Indicator is a device fixed on the metal grounded part of the insulator 1 or on a garland of insulators, or in the immediate vicinity of them on the support arm. It consists of electrode 2, marker 3 and fusible element 4. Electrode 2 is involved in forming the air gap of insulator 1, marker 3 allows to visually determine the fact of overlapping of insulator 1, by means of fuse element 4 the circuit opens when the short-circuit current flows at air overlapping of insulator 1 or the insulator strings and marker 3 is released.EFFECT: proposed insulator overlap indicator allows you to visually identify an insulated insulator or a garland of insulators after the presence or absence of a marker on the insulating suspension.6 cl, 1 dwg

Description

The invention relates to the field of electric power and, in particular, to indicators of overlapping insulators (insulation structures) of overhead power lines with a voltage of 6 ÷ 1150 kV.

A support pin insulator with a moving signal device is known, including a cap, an insulator skirt, a grounded traverse with a pin, characterized in that a signal device is attached to the cap made with a conductive surface, consisting of a conductor, by which a pipe-shaped ring is held under the insulator skirt , the other end of the conductor, passing through the hole in the housing and on the inner surface of the ring, is fixed to the grounded pin with a cap [1].

In this technical solution, to fix the overlap of the support-pin insulator, a moving signal device is used, adapted only for insulators of this type, which is not effective when installing these signal devices on insulators of a different type and class.

A known indicator of the state of high-voltage insulation made of tempered electrical glass, characterized in that the internal electric strength of the indicator is less than the electric strength of its external air gap and when the dielectric properties of the controlled insulation are reduced, the indicator is destroyed as a result of internal breakdown, signaling the failure of the controlled insulation [2 ].

This indicator of the state of high-voltage insulation is made of tempered electrical glass, the internal electric strength of which is less than the electric strength of its external air gap, and when the dielectric properties of the controlled insulation decrease, the indicator is destroyed as a result of internal breakdown. This principle of operation of the indicator will require a significant change in the manufacturing technology and expansion of the range of insulators, which is quite expensive from a material and financial point of view.

A breakdown indicator of a polymer insulator is also known, comprising a dielectric element having a central part extended along the axis with a cavity open at one end, a radially extended peripheral part and a conductive rod for attachment to the insulator, one of its ends mounted in the said cavity, a control electrode installed coaxially with said rod close to the inner surface of said peripheral part, a coating configured to electrically isolate the contact zone omyanutogo gate electrode with said dielectric element, wherein (a display), said dielectric member is made of brittle material and thermal stress is provided with an optical breakdown in the thickness of the dielectric member, and the relative permittivity of said coating material is less than the dielectric constant of said dielectric element [3].

The considered breakdown indicator of the polymer insulator is built on the principle of the interaction of the dielectric element and the control electrode due to the introduction of a coating made with the possibility of electrical isolation of the contact zone of the control electrode with the dielectric element and having a relative dielectric constant less than the dielectric constant of the material of the dielectric element. That is, the widespread use of this type of breakdown indicators is unlikely, due to their structural complexity and the need to significantly change the design and manufacturing technology of the insulators themselves.

The applicant set himself the practical goal of significantly simplifying both the design of the indicators and the visual determination of the overlap of the insulators with their help while ensuring reliable operation during long-term operation on overhead power lines with a voltage of 6 ÷ 1150 kV.

The above technical result was achieved due to a new set of essential structural features of the indicator of overlap of insulators of overhead power lines with a voltage of 6 ÷ 1150 kV, made according to the present invention, presented in the following claims: “indicator of overlap of insulators of overhead power lines with a voltage of 6 ÷ 1150 kV, representing a device mounted on a metal grounded part of the insulator or on a string of insulators or in direct proximity spacers from them on the support traverse, consisting of at least the following elements: an electrode participating in the formation of the air gap of the insulator, a marker that allows you to visually determine the fact of overlap, a fusible element that opens the circuit when a short circuit current flows through the air overlap of the insulator or garland insulators and a releasing marker, disconnecting it from the device, thereby confirming the fact of overlap; it is made in the form of a spring-loaded housing mounted on a metal grounded part of the insulator or a string of insulators or a traverse of the support using a bracket connected to the marker by means of at least one bolt located in the hole of the bracket and connected to the metal sleeve by solder, and the outside bushings are made for fastening the marker and electrode, while the solder opens the circuit when a short circuit current flows through the air circuit of the insulator and disconnects mayor manner token from the housing, allowing determine visually covered with an insulator or insulator string; the electrode is made in the form of a cap nut screwed onto the aforementioned metal sleeve; the marker is fully or partially made of a polymeric material; the indicator is structurally combined with a protective screen mounted on an insulator or a string of insulators; the indicator is structurally combined with a protective screen and a discharge horn mounted on an insulator or a string of insulators. "

The invention is illustrated by drawings, where in FIG. 1 shows a General view of the indicator overlap insulators overhead power lines with a voltage of 6 ÷ 1150 kV, made according to the present invention.

The inventive indicator of the overlap of insulators of overhead power lines with a voltage of 6 ÷ 1150 kV is a device mounted on a metal grounded part of the insulator 1 (Fig. 1) or on a string of insulators or in the immediate vicinity of them on a support beam (not shown). It consists of electrode 2, marker 3 and fusible element 4. Electrode 2 is involved in the formation of the air gap of insulator 1, marker 3 allows you to visually determine the fact of overlap of insulator 1, using fusible element 4, the circuit is opened when a short-circuit current flows through the air shutoff of insulator 1 or a string of insulators and marker 3 is released (if there is no marker, it is concluded that the insulator or string of insulators is blocked).

Marker 3 is fully or partially made of polymer material, in shape and dimensions it is, for example, made like a tennis racket, therefore it is clearly visible from the ground visually.

A specific embodiment of the design indicator of the overlap of the insulators of overhead power lines with a voltage of 6 ÷ 1150 kV: the indicator is in the form of a spring-loaded housing 5, mounted on a metal grounded part 6 of the insulator 1 or a string of insulators or a traverse of the support using the bracket 7. The bracket 7 is connected to the marker 3 by one bolt 8 (there may be several bolts), which is located in the hole of the bracket 7 and connected to the metal sleeve 9 by solder 10. Outside of the sleeve 9 a thread is used to fasten marker 3 and electrode 2. When a short-circuit current flows when the insulator 1 is blocked by air, solder 10 melts and opens the circuit (both electric and mechanical) under high temperature and thus disconnects marker 3 from housing 5 ( it falls to the ground), which allows you to visually identify the overlapped insulator 1 or a string of insulators.

The indicator can be structurally combined with a protective shield 11 if it is mounted on insulator 1 or a string of insulators, and it can also be structurally combined simultaneously with a protective shield 11 and a discharge horn if they are both mounted on insulator 1 or a string of insulators.

The proposed indicator of overlapping insulators of overhead power transmission lines with a voltage of 6 ÷ 1150 kV allows you to visually identify a blocked insulator or a string of insulators bypassing the line from the ground by the presence or absence of a marker on the insulating suspension. Moreover, the indicator is very simple in design, due to the minimum of elements (electrode, fusible element, marker and simple fasteners), which ensures its high reliability during operation and good prospects for implementation in the practice of electric grid construction.

Information sources

[one]. Description of the utility model for patent No. 130747 "Support-pin insulator with a moving signal device." HB01 17/20. Declared January 11, 2013, published July 27, 2019.

[2]. Description of the invention to the patent of the Russian Federation No. 2392679 "Indicator of the state of high-voltage insulation." НВВ 17/00. Declared June 10, 2009, published June 20, 2010.

[3]. Description of the invention to the patent of the Russian Federation No. 2479057 “Breakdown indicator of a polymer insulator and a polymer insulator with a breakdown indication”. HB01 17/46. Declared 10.11.2011, published 10.04.2013.

[four]. Description of the invention to the patent of the Russian Federation No. 1697121 "Polymer insulator". НВВ 17/00. Declared 05/11/1989, published on 01/20/1997.

[5]. Description of the invention to the patent of the Russian Federation No. 1529296 "High-voltage pin linear insulator". HB01 17/20. Declared March 9, 1988, published December 15, 1989.

[6]. Description of the invention to the patent of the Russian Federation No. 2113741 "High-voltage insulator". HB01 17/20. Declared July 8, 1992, published June 20, 1998.

[7]. Description of the invention to the patent of the Russian Federation No. 2408104 "Pin insulator with control of internal insulation." HB01 17/46. Declared June 10, 2009, published October 27, 2010.

[8]. US patent No. 201110011621 A1 "Insulation breakdown indicator." HB01 17/46, published 01/20/2011.

[9]. WO No. 201089544 A2, “Insulator Breakdown Indicator”, H01B 17/46, published July 28, 2011.

Claims (6)

1. The indicator of the overlap of insulators of overhead power lines with a voltage of 6 ÷ 1150 kV, which is a device mounted on a metal grounded part of the insulator or on a string of insulators or in the immediate vicinity of them on a support beam, consisting of at least an electrode involved in the formation of the air gap of the insulator, a marker that allows you to visually determine the fact of overlap, and a fuse that opens the circuit when a short circuit current flows through the air ora or garlands of insulators and releasing a marker, disconnecting it from the said device, thereby confirming the fact of overlap, characterized in that it is made in the form of a spring-loaded housing mounted on a metal grounded part of the insulator or a string of insulators or a traverse of the support using a bracket connected to the marker by means of at least one bolt located in the hole of the bracket and connected by means of a fusible element to a metal sleeve made on the outside with a thread designed to fasten the marker and electrode in such a way that when a short circuit current flows through the air circuit, the fuse element melts under the influence of high temperature, opens the circuit, both electric and mechanical, and disconnects the marker due to the action of the spring from the housing, which falls to the ground, allowing you to visually identify a blocked insulator or a string of insulators. 2. The indicator according to claim 1, characterized in that solder is taken as a fusible element. 3. The indicator according to claim 1, characterized in that the electrode is made in the form of a cap nut screwed onto the aforementioned metal sleeve. 4. The indicator according to claim 1, characterized in that the marker is fully or partially made of a polymeric material. 5. The indicator according to claim 1, characterized in that it is structurally combined with a protective screen mounted on an insulator or a string of insulators. 6. The indicator according to claim 1, characterized in that it is structurally combined with a protective screen and a discharge horn mounted on an insulator or a string of insulators.

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