RU2762064C1 - Supporting suspension - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: invention relates to the electric power engineering, namely to insulating packaged supporting suspensions with a reduced level of corona activity and radio interference for power transmission lines of 35 to 750 kV and above. The supporting suspension comprises a string of glass insulators and consists of a mounting unit, an intermediate chain link, an intermediate mounting link, a strap, a glass insulator with an aerodynamic profile, a glass insulator with a reduced radio interference level, a socket clevis, a supporting blind clamp with a protector, protective screens located before and after the glass insulators, connected in series, wherein all elements of the coupling fittings are interconnected by a pin-eyelet type connection with pins without sharp edges.

EFFECT: increase in the reliability and cost efficiency of the product.

1 cl, 2 dwg

Description

The invention relates to the electric power industry, in particular to insulating complete supporting suspensions with a reduced level of corona activity and radio interference for power lines of 35-750 kV and above.

At the moment, transmission losses are mainly accounted for as “wire losses”. But the losses in the insulator string must also be taken into account, although they are incommensurably less than the losses in the wire. Sources of losses are leakage current losses and corona losses.

Insulators and hangers are both the most important and the most unprotected element. It is on them that the main number of overhead line shutdowns falls - for any reason, due to the negative impacts of a climatic, natural and man-made nature. The reliability of the overhead line primarily depends on insulators and suspensions. Therefore, the suspension, as a single element, is the most important product for ensuring the reliability of the overhead transmission line.

The claimed support suspension has a reduced level of corona activity and radio interference and is a set of insulator elements and fittings that ensure reliable operation.

An insulating suspension of wires of an overhead power transmission line is known from the prior art (patent for invention SU 1778849, publ. 30.11.1992 Bull. No. 44). The suspension contains a supporting clamp, branches lying at an angle, consisting of parallel strings of insulators, and coupling fittings. The insulator strings are divided along their entire length into sections (consisting of several insulators) using coupling fittings, the elements of which, located in parallel circuits at the same level, are interconnected by metal elements, forming steps for the installer's passage. The disadvantages of this technical solution are:

- high level of corona losses and radio interference;

- increased demand for insulators and fittings and, as a consequence, increased loads on the supports.

The closest is the reinforced insulating suspension (patent for a useful model RU 144010, publ. 08/10/2014 Bull. No. 22). A polymer insulator is adhered to the upper part of the garland, made in the form of a fiberglass rod, equipped with metal end fittings. The rod is enclosed in a ribbed sheath made of silicone rubber with an overhang of the upper rib equal to or greater than the distance between the upper rib and the upper end of the polymer insulator. The length of the fiberglass rod between the metal end fittings does not exceed 0.15 of the length of the garland. The disadvantage of this technical solution is the high level of corona losses and radio interference.

The task to be solved by the claimed technical solution is to reduce the bending moments arising in fittings and insulators, to reduce corona and radio interference losses.

The problem is solved by the fact that the supporting suspension contains a garland of glass insulators, and consists of a series-mounted attachment point, an intermediate chain link, an intermediate mounting link, an earring, a glass insulator with an aerodynamic profile, a glass insulator with a low level of radio interference, a two-footed eyelet, supporting a blind clamp with protector, protective screens located in front of and after glass insulators, while all elements of coupling fittings are interconnected by a “finger-eye” connection with fingers that do not have sharp edges.

The technical result provided by the given set of features is to increase the reliability and efficiency of the product.

To fasten the overhead line wire to the supports, an insulating suspension with a garland of insulators is used. Such a suspension consists of a support clip made of a non-magnetic material, in which the phase wire is fixed. The clamping bolts are recessed into the body of the coupling fittings with a pin-to-eye connection, complete with special pins that do not have sharp edges, glass suspension insulators with a reduced level of radio interference, as well as protective screens.

The essence of the invention is illustrated in FIG. 1, fig. 2, which shows a general view of the device.

The device consists of a fastening unit 1, an intermediate chain link 2, an intermediate mounting link 3, a shackle 4, a glass insulator with an aerodynamic profile 5, a glass insulator with a reduced level of radio interference 6, a two-footed eyelet 7, a supporting blind clamp with a protector 8, a protective screen 9, located in front of the glass insulator 5, a protective screen 10 located after the insulator 6.

Attachment unit 1 is a product for attaching a suspension to a support; attachment points of the KGP type are used.

The intermediate chain link 2 is a product for the transition to a chain connection, a link of the PRTs type is used.

The intermediate mounting link 3 is a product designed for the convenience of mounting suspensions; a link of the PTM type is used.

Shackle 4 is a product for connecting the reinforcement and the cap of a glass suspension insulator, as well as for mounting a protective screen; a CP shackle is used.

Glass insulator 5 with an aerodynamic profile is an insulating piece made using a technology that reduces the level of radio interference in comparison with standard insulators by 10-15%, depending on the voltage class. The use of insulators with an aerodynamic profile promotes self-cleaning of these insulators under the influence of wind and prevents contamination of the remaining insulators of the string.

Glass insulator 6 with a reduced level of radio interference is an insulating piece made using a technology that reduces the level of radio interference in comparison with standard insulators by 10-15%, depending on the voltage class. In the claimed device, insulators of reduced size are used, while the creepage distance is increased by 27%.

These insulators are widely known in the art.

The two-footed eyelet 7 is a product for connecting the rod of a glass suspension insulator with subsequent fittings, as well as for mounting a protective screen. An eyelet of the USK type is used.

A deaf support clamp with a protector 8 is a product for attaching a phase wire to an insulating suspension; a PGN DU type clamp is used.

Protective screen 9 is a product designed to eliminate the corona on the suspension armature and reduce the voltage unevenness on the insulator string.

The protective shield 10 is a product designed to eliminate the corona on the suspension armature and reduce the voltage unevenness on the insulator string.

All elements of the coupling fittings are interconnected by a pin-to-eye connection with special pins. The head of the pin is a segment of a ball with two turnkey grooves and has no sharp edges. An annular groove is made in the finger nut on the outer surface, into which the tendrils of the cotter pin are recessed and also does not have sharp edges.

The use of suspensions for split phases is provided by an appropriate number of supporting clamps connected by a rocker arm 11 (Fig. 2).

The advantages of the claimed device are:

- reduction of electrical energy losses by leakage currents, corona activity, reduced level of radio interference,

- ensuring some deviation of elements in two mutually perpendicular planes,

- the ability to steadily perceive vibrational and dynamic alternating loads arising from the impact of wire dance and wind, protecting the insulating garland and suspension from possible destruction,

- reduction of the required maintenance and repair,

- the reliability of the suspension is guaranteed by the compliance of the linear insulation design with the actual operating conditions and the forecast of changes in external operating conditions.

Reduction of corona and radio interference losses is achieved by redesigning the line fittings and the use of special insulators, as well as by innovative pins that are made without sharp edges.

Claims (1)

Supporting suspension containing a garland of glass insulators, characterized in that it consists of a series-mounted attachment point, an intermediate chain link, an intermediate mounting link, an earring, a glass insulator with an aerodynamic profile, a glass insulator with a low level of radio interference, a two-footed eyelet, supporting a blind clamp with a protector , protective screens located in front of and after the glass insulators, while all elements of the coupling fittings are interconnected by a “finger-eye” connection with fingers that do not have sharp edges.

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