RU2733647C1 - Method for suspending high-frequency shield and high-frequency shield - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: high-frequency shield on structures of supports of overhead transmission lines and linear portals of substations in order to prevent its oscillatory and rotational movements is fixed by fastening structures on suspension, which is two parallel branches of the linear reinforcement passing through the reactor body, alternating with the insulators, converging outside the reactor body through the universal rocker in one branch, and fixed on the support by the ends of two parallel suspension branches on one side and the single end of the suspension to the power transmission line wire on the other side so that the rotation axis of the high-frequency shield reactor is located coaxially with the power transmission line wire, high-frequency deflector and overhead power line contacts are connected with loops. Contact between loop shield and CCP is performed by means of line branching spiral clamps and by means of line connecting clamps, which allows to considerably increase their reliability in comparison with current bolt connection of hardware clamp.EFFECT: high reliability of high carrier-current protection (CCP) and overhead power line operation.6 cl, 4 dwg

Description

The invention relates to high-frequency communication, in particular to systems for transmitting information over power lines, namely to high-frequency minelayers, and methods for their installation.

A high-frequency trap (HFZ) is an electrical device installed in a break in the phase wire of an overhead power transmission line (VL), which has a high resistance at the frequency of the HF communication channel and low resistance at an industrial frequency (50 Hz). VChZ are included in series in the wires of the overhead line.

A typical VChZ, widely installed today on overhead lines, consists of parallel interconnected reactors of a trap 1, a setting element, an overvoltage limiter and is suspended on strings of insulators 2 on linear portals of substations and on supports of overhead lines in vertical (Fig. 1. A) [1] or horizontal positions (Fig. 1. b) [2] and with the help of connecting loops 3 is connected in series with the overhead line wire. The connecting loops are connected to the metal contacts of the VChZ through hardware clamps. With vertical suspension of VChZ on a support or a linear portal, the greatest distance between its live parts and grounded parts of structures is provided, which meets the requirements of the current regulatory and technical documents.

Regardless of which of the known methods the VChZ is suspended, in practice, due to its swinging under the influence of the wind, the overall distances to the elements of the support of the overhead line on which it is suspended change. The research data [3] also indicate that the main problems during the operation of the VChZ are damage to the VChZ with wire burnout due to bending of the loop, lateral attraction of the loop connected from the side of the switchgear (RU) to the VChZ, burnout of the conductive cores of the turns of the trap at the point of contact with VChZ. In work [3] it is shown that the damage to the VChZ occurs due to the arising short circuits on the overhead line. Due to the increase in currents flowing through the HFZ, it is an electromagnet, under the action of which the loop wire is attracted to the HFZ. At the point of contact, an inter-turn short circuit occurs, the current of which damages the equipment. Oscillatory movements of the VChZ under the influence of wind also lead to alternating loads on the connecting loops between the VChZ and the overhead line, weakening of the contact connections in the hardware clamps, which in turn causes heating and thermal destruction of the contacts, and breaks of wires and hardware clamps also occur. The resulting damage leads to emergency shutdowns of the overhead line and disruptions in the operation of the high-frequency communication channel.

The indicated problems of VChZ operation can be solved with the help of the claimed group of inventions.

The main objective of the claimed group of inventions is to create a method for suspending a high-frequency trap, which makes it possible to minimize the oscillatory and rotational movements of the VChZ, to exclude the possibility of its approaching the support elements under wind loads and attracting the loop wires to the reactor when short-circuit currents flow through the overhead lines, as well as the development VChZ design for the implementation of this method, while having improved contacts with the wires of the connecting loops.

The technical result is to increase the reliability of the VChZ and overhead lines.

The technical result is achieved by the fact that a high-frequency trap on the structures of overhead line supports and linear portals of substations in order to prevent its oscillatory and rotational movements is fixed with fastening structures on a suspension, which is two parallel branches from linear reinforcement passing through the reactor body, alternating with insulators, converging outside the body reactor through a universal rocker arm into one branch, and fastened on the support with the ends of two parallel suspension branches on one side, and with a single end of the suspension to the overhead line wire on the other side, so that the axis of rotation of the high-frequency trap reactor is coaxial with the overhead line wire, connect the contacts high-frequency minelayer and overhead lines.

It is advisable to make contact between the wire of the connecting loop and the high-frequency trap with the help of a branching spiral clamp, which is wound with one end on the last turns of the reactor winding of the high-frequency trap, and with the other end, its soldered part, is fixed to the wire of the connecting loop.

Optimally, the contact of the high-frequency trap with the overhead lines is carried out using loop connecting clamps.

The technical result is also achieved by the fact that a high-frequency trap, containing a parallel connected reactor, a tuning element and a surge arrester, is adapted to be attached coaxially with the overhead line wire by tension suspension strings passing through the reactor body, for the implementation of which it additionally contains attachment points for tension suspension strings on the upper and lower bases of the reactor.

Optimally, in a high-frequency trap, in which the upper and lower base of the reactor coil is made in the form of steel crosspieces, on each of the crosspieces, place two attachment points for tension strings.

It is advisable to bring the ends of the winding of the reactor wire outside the reactor body in a high-frequency trap in order to realize the possibility of connecting them to the wires of the stubs using a loop connecting clamp.

The inventive method and device make it possible to increase the reliability of the VChZ and OTL operation by eliminating the possibility of oscillatory and rotational movements of the VChZ at any wind loads, the possibility of approaching the VChZ to the support elements. When the VChZ is suspended on the developed suspension structure, consisting of two tension strings, coaxially with the overhead line wire, the alternating load on the wires of the connecting loops is significantly reduced. The new proposed design of the contact between the wires of the loop and VChZ with the help of stub branch spiral clamps, as well as with the help of loop connecting clamps, can significantly increase their reliability in comparison with the bolted connection of the hardware clamp used today and reduce operating costs by eliminating the need for periodic revisions of bolted connections with conclusion of overhead lines for repair, as well as carrying out diagnostics by the method of thermal imaging control.

The claimed method of suspending a high-frequency trap and a high-frequency trap device are interconnected so that they form a single inventive concept.

Indeed, specifically for the implementation of the VChZ suspension method, a VChZ design was developed, which makes it possible to implement the inventive method.

Therefore, the claimed inventions satisfy the requirement of unity of invention.

The claimed group of inventions is illustrated by an example of a specific implementation and the following drawings.

Fig. 1. a) and b), respectively, are shown vertically and horizontally suspended VChZ by existing methods, as well as the location of the wires of loops and overhead lines relative to the VChZ.

FIG. 2. a) and b) shows the design of a typical VChZ, side and top views. Here the numbers indicate: 4 - upper and lower base (reactor crosses); 5 - upper and lower VChZ contacts for connecting loops with hardware clamps.

FIG. 3 shows a schematic representation of: a) a vertical section of a VChZ suspended on a support by the claimed method; b) horizontal section of VChZ on a suspension; c) view of VChZ on the suspension from below; d) VChZ with free ends of the reactor wire.

Fig. 4. shows a photo of the VChZ of the claimed design, with a suspension for coaxial fastening with a wire of the overhead line, which was installed on the 110 kV overhead line Pachetlor-Imilor 1 of the branch of JSC "Rosseti Tyumen" Surgut electrical networks.

The method is implemented as follows. In a typical VChZ (Fig. 2 a, b.) On the bases of the reactor 4, attachment points 6 are placed for linear reinforcement of tension garlands of a special suspension 7. Suspension 7 is (Fig. 3 a, b, c) converging through a universal rocker arm 8 into one branch two branches of tension strings, consisting of insulators and linear fittings (12-ton row as an option). Two branches of tension garlands of a special suspension 7 (Fig. 3 a, b) are passed through the reactor body, on which the VChZ is fixed with the help of attachment points 6. To exclude the shunting of the VChZ electrical circuits by linear fittings located inside the VChZ, two insulators are installed in the circuit between the industrial links of the reinforcement in each garland (version). The attachment points 6 are located on the parallel sides of the cross of the upper and lower base of the VChZ reactor (version). Suspension branches 7 passing through the VChZ reactor are equidistant and parallel to the longitudinal axis of the reactor. Placed in the place of use of VChZ with a suspension as follows. The two ends of the parallel tension strings of the suspension 7 are fixed on the structures of the overhead line supports or the linear portals of the substations, on the other hand, the single end of the VChZ suspension is fixed coaxially with the overhead line wire. The design of the suspension allows you to reduce the rotational and oscillatory movements of the VChZ to a minimum, and also excludes the possibility of its approaching the support elements under any wind loads. Also, the alternating load on the wires of the connecting loops is significantly reduced.

To organize the contact between the wires of the loop and the VChZ, stub branch spiral clamps 9 (Fig. 3 c), (version), which are wound on the last stripped turns of the reactor, or loop connecting clamps (version), which are wound on the free ends of the wire, are used VChZ reactor (Fig. 3.d). The tap-off part is used for stub branching spiral clamps, and the loop connecting clamps are wound with the second part on the wires of the connecting stubs. Such design of contact connections allows to significantly increase their reliability in comparison with standard hardware clamps used in typical VChZ.

A prototype VChZ with coaxial fastening to the overhead line wire according to the above-described design was installed on the 110 kV Pachetlor-Imilor 1 overhead line and showed stable operation in difficult weather conditions for a long time. To organize the contact between the wires of the loop and the VChZ, branch-line clamps ShSO-15.2 / 01 were used.

Thus, the suspension of the VChZ by the inventive method allows increasing the reliability of the VChZ and VL.

Literature:

1. HIGH FREQUENCY PROTECTORS OPERATING MANUAL LEUT.670136.001 RE. EKRA GROUP OF COMPANIES LLC URAL PLANT OF NEW TECHNOLOGIES.

2. Project No. 933-303-26 110 kV overhead line Tagrinskaya-Bakhilovskaya with 110 kV Bakhilovskaya substation, Tomsk branch of the Energoset project, 1990

3. Analysis of damage to high-frequency traps in the 110 kV network. Kvetkin A.V., Konstantinov A.M., SCIENTIFIC, TECHNICAL AND ECONOMIC COOPERATION OF APR COUNTRIES IN THE XXI CENTURY., Publishing house: Far Eastern State Transport University, Khabarovsk. Volume: 1, 2019, p. 25-28.

Claims (6)

1. A method of suspending a high-frequency trap with the help of linear fittings and insulators on the structures of overhead power transmission line supports and linear portals of substations, characterized in that the high-frequency trap is fixed with fastening structures on a suspension, which is two passing through the reactor body, in order to prevent its oscillatory and rotational movements parallel branches of linear reinforcement, alternating with insulators, converging outside the reactor body through a universal beam into one branch, and are attached to the support by the ends of two parallel suspension branches on one side and a single suspension end to the overhead power line wire on the other side so that the axis the rotation of the reactor of the high-frequency minelayer was located coaxially with the wire of the overhead power line, the contacts of the high-frequency minelayer and the overhead power line are connected by loops. 2. The method of suspending a high-frequency minelayer according to claim 1, in which the contact between the wire of the connecting loop and the minelayer is carried out using a branch-type spiral clamp, which is wound with one end on the last, stripped turns of the reactor winding of the high-frequency minelayer, and with the other end, its soldered part, connected to the wire of the connecting loop. 3. The method of suspending a high-frequency trap according to claim 1, in which the contacts of the high-frequency trap with the wires of the overhead power transmission line are carried out using loop connecting clamps. 4. A high-frequency trap containing a parallel-connected reactor, a tuning element and a surge arrester, characterized in that it is capable of being fastened by the method of claim 1 and additionally contains attachment assemblies for suspension strings on the upper and lower bases of the reactor. 5. The high-frequency trap according to claim 4, in which the upper and lower bases of the reactor are made in the form of steel crosses, on each of which there are two nodes for attaching the tension suspension strings. 6. A high-frequency trap according to claim 5, in which the ends of the winding of the reactor wire are brought out of the reactor body in order to realize the possibility of connecting a loop connecting clamp to them.

Images