DE202012007791U1 - Line vibration damper of an overhead line with a vibration damper - Google Patents

Abstract

Line vibration damper of an electrical overhead line with a spring bar (2), a bracket (3) for fastening the spring bar (2) in the same way as the line (1) and weights (4), which are attached to the center of the respective ends of the spring bar (2) , each weight (4) being elongated along its longitudinal axis, characterized in that the weights (4) are fastened transversely to the elastic spring bar (2) and each natural frequency fr of the vibration damper fulfills one of the following conditions:

Description

The invention relates to a line vibration damper with a vibration damper according to the preamble of claim 1.

The invention can be used in the electricity industry. It can be used to protect cable lines and earth cables of an overhead line against wind vibrations.

Under wind stress, permanent vibrations can occur in the cable lines (as well as in the earth cables). These vibrations are within a typical frequency range for the respective line (aeolian vibration). This wind-induced vibration can cause fatigue damage to the pipe in case of a fairly large vibration length and duration. The protection against wind vibrations is accomplished with the help of vibration dampers [ Technical Regulations for Electrical Installations, 7th edition, Energoservice, 2003, P. 2.5.85 ].

By the RU2262173 is known as a prototype line vibration damper for overhead lines. He has a spring bar, a clamp and weights on. A clamp is used to attach the spring rod in the same direction with the wire of the overhead line. Each of the weights is elongated along its longitudinal axis. According to the prototype, the weights are attached to the ends of the spring bar so that their longitudinal axes are aligned along the spring bar. They coincide with the longitudinal axis of the spring bar or are the same with it.

The disadvantage of the prototype is that in the system "line plus vibration damper" permanent resonance oscillations can occur whose oscillation range can exceed a permissible limit value.

It is an object of the invention to eliminate this deficiency.

The stated object is solved by the features of claim 1.

The technical effect of the invention is to increase the reliability of the cables and overhead cables of overhead lines and their protection against wind vibrations.

The subject of the invention is a line vibration damper for electrical overhead lines. He has a spring bar, a clamp and weights on. A clamp is used to attach the spring bar in the same direction with the line. The weights are fixed in the middle at the ends of the spring bar. Each weight is elongated along its longitudinal axis. The line vibration damper is characterized in that the weights are mounted across the spring bar, and each natural frequency f _{r of} the vibration damper fulfills one of the following conditions: f _r <f _u or f _r > f _o , where f _u and f _{o are} respectively the lower and upper limits of the frequency range of the line vibration.

This makes it possible to achieve the said technical effect.

The invention has a more precise further development (design): Each weight is in the form of a steel pipe piece, which with a heavy metal, for. B. lead, is filled.

The subject of the invention is also an overhead line with masts and a line vibration damper. The electrical cable is attached to the masts via insulators and brackets. The line vibration damper is used at least in one of the clamping fields of the electrical overhead line.

When the overhead line runs over a high wind load terrain, the lines provided with such dampers are characterized by increased operational reliability.

The invention is based on a in the drawing 1 illustrated embodiment illustrated.

The vibration damper after 1 is on a lead 1 arranged.

The vibration damper has a spring bar 2 , a clamp 3 for fixing the vibration damper to the pipe 1 and weights 4 on.

The weights 4 are at the ends of the spring bar 2 attached. Every weight 4 is its longitudinal axis 6 elongated. It can, for. B. may be formed as a cylinder or a rod with a square cross-section.

The weight 4 in the above form is transverse to the spring bar 2 arranged. Every weight 4 is in its middle at each end of the spring bar 2 attached.

The clip 3 is on the spring bar 2 fixed in its center. She is on the line 1 so fastened that the spring bar 2 and its longitudinal axis 5 in the same direction with the line 1 run. Here are the line 1 , the spring bar 2 and the clip 3 in a vertical plane and the axes 6 and 5 in a horizontal plane.

The vibration damper is characterized by its natural frequencies f _r . Their position on the frequency axis depends on the structural characteristics of the vibration damper [ SV Trofimov. Analysis of the vibration damping effect calculation results on the sample of the AS-120-19 wire.//Electro. Electrical engineering, electrical energy, electrical engineering industry. 2011, Issue 2 ].

An overhead line has masts 7 (in 1 one of them is shown) and a proposed vibration damper. At the masts 7 is the lead 1 with the help of insulators 8th and holding or clamping brackets 9 attached. The vibration damper is on the line 1 arranged in at least one span of the overhead line.

The characteristic vibration range .DELTA.f, in which within the line line vibrations of the line 1 may have a lower bound f _u and an upper bound f _o . The Hertz values of f _u and f _o are each f _u = 0.18 / d and f _o = 1.4 / d. Where d is the pipe diameter of the pipe 1 in meters [ IEC 61897-1998 , Overhead lines. Vibration Damping Requirements for Stockbridge Wind Vibrations and their Tests / Overhead lines - Requirements and tests for Stockbridge type aeolian vibration dampers].

The proposed construction of the vibration damper with the transverse to the spring rod 2 arranged weights 4 makes it possible to carry the natural frequencies f _{r of} the vibration damper out of the Δf range between the limit values f _u and f _o . This makes it possible to improve the safety of line protection against wind vibrations, which in the end a more reliable function of equipped with such a vibration damper line 1 ensures.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• RU 2262173 [0004]

Cited non-patent literature

• Technical Regulations for Electrical Installations, 7th ed., Energoservice, 2003, p. 2.5.85 [0003]
• SV Trofimov. Analysis of the vibration damping effect calculation results on the sample of the AS-120-19 wire.//Electro. Electrical engineering, electrical energy, electrical engineering industry. 2011, Issue 2 [0020]
• IEC 61897-1998 [0022]

Claims (5)

Line vibration damper of an electrical overhead line with a spring rod ( 2 ), a bracket ( 3 ) for fixing the spring bar ( 2 ) in the same direction as the line ( 1 ) and weights ( 4 ) with the center at the respective ends of the spring bar ( 2 ), each weight ( 4 ) is elongated along its longitudinal axis, characterized in that the weights ( 4 ) transversely to the elastic spring rod ( 2 ) and each natural frequency f _{r of} the vibration damper satisfies one of the following conditions: f _r <f _u or f _r > f _o , where f _u and f _{o are} respectively the lower and upper limits of the frequency range of the line vibration. Vibration damper according to claim 1, characterized in that each weight ( 4 ) is formed of the vibration damper in the form of a steel pipe piece, which with a heavy metal, for. B. lead, is filled. Vibration damper according to claim 1 and 2, characterized in that the cut-off frequencies f _u = 0.18 / d and f _o = 1.4 / d, where d is the diameter of the line ( 1 ). Vibration damper according to claim 1 to 3, characterized in that the spring rod ( 2 ) in parallel with its longitudinal axis ( 5 ) with the line ( 1 ) and that the line ( 1 ), the spring bar ( 2 ) and the bracket ( 3 ) in a vertical plane and the axes ( 6 and 5 ) of the weights ( 4 ) and the spring bar ( 2 ) lie in a horizontal plane. Overhead line with masts ( 7 ), on which one by means of insulators ( 8th ) and a bracket ( 9 ) fixed electrical line ( 1 ) and a line vibration damper at least in one of the clamping fields of the overhead line ( 1 ), characterized in that the line vibration damper according to one of claims 1 to 4 is formed.

Images