CN211320890U - Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV - Google Patents

Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV Download PDF

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Publication number
CN211320890U
CN211320890U CN201922182613.2U CN201922182613U CN211320890U CN 211320890 U CN211320890 U CN 211320890U CN 201922182613 U CN201922182613 U CN 201922182613U CN 211320890 U CN211320890 U CN 211320890U
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China
Prior art keywords
lightning protection
lightning
overhead line
distribution
inductance coil
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Application number
CN201922182613.2U
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Chinese (zh)
Inventor
韦树友
周宝光
韦柳港
韦伟杰
覃启忠
陈千懿
高立克
陈绍南
徐翔宇
莫芳
欧阳健娜
覃勇
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Liuzhou Liujiang Power Supply Bureau Guangxi Power Grid Co ltd
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Liuzhou Liujiang Power Supply Bureau Guangxi Power Grid Co ltd
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Priority to CN201922182613.2U priority Critical patent/CN211320890U/en
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Abstract

The utility model relates to a electric wire netting high voltage and lightning protection field disclose a 10kV joins in marriage net overhead line's distribution transformer lightning protection wiring structure, its characterized in that: the lightning protection system comprises a 10kV distribution network overhead line, a drop-out fuse, a lightning arrester, a lightning protection inductance coil and a distribution transformer, wherein the tail end of the 10kV distribution network overhead line is connected with an electric pole; the drop-out fuse, the lightning arrester, the lightning protection inductance coil and the distribution transformer are arranged on the electric pole and are connected through the conducting wires in sequence(ii) a The tail end of the electric pole is a pole tower, and a lightning-protection cross arm is arranged on the pole tower; the lightning protection inductance coil is arranged on the lightning protection cross arm; the conductor is 70mm in cross section2The insulated overhead line can ensure that the heat generated when the normal load current flows through the conducting wire for a long time can not damage the insulating layer. The utility model discloses the condition that 10kV transformer suffered the damage when can effectively avoiding the distribution network to suffer the thunderbolt.

Description

Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV
Technical Field
The utility model relates to a electric wire netting high voltage and lightning protection technical field, more specifically relates to a 10kV joins in marriage net overhead line's distribution transformer lightning protection wiring structure.
Background
Rural power grids are mostly overhead lines, and lines and equipment in a multi-thunder area are easily damaged by thunder and lightning. Compared with a power transmission line, the erection height of the power distribution line is lower, but the power distribution line is easily influenced by inductive lightning due to the low insulation level of the power distribution line. According to statistics, over 80% of lightning overvoltage in a distribution network is caused by inductive lightning, and rural distribution network lines are usually 10kV distribution overhead lines. At present 10kV joins in marriage net overhead line's main lightning protection means relies on the arrester of installation on the circuit, and the old unavoidable equipment of this means makes the thunderbolt damage, and the leading cause includes: (1) the lightning arrester has a single model, the rural power grid equipment is backward in level, and the installed lightning arresters in one line are all of the same model, cannot cope with lightning strikes in various forms, and do not meet the technical requirements of differential lightning protection; (2) the quality of a part of grounding grid on a circuit does not reach the standard, the grounding resistance is overlarge, the grounding end of the lightning arrester cannot be effectively grounded, and the lightning arrester cannot introduce lightning waves into the ground during lightning stroke, so that the lightning protection effect cannot be achieved.
In addition, rural power distribution network line corridor environment is complicated, once distribution transformer is struck by lightning, terrains such as mountains, ridges, ponds and the like bring difficulty to the first-aid repair work, electric power workers need to spend a large amount of manpower and material resources to reach the site and carry out work, and the power distribution network line corridor environment is also the loss of national assets for the power grid.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that even current 10kV joins in marriage net overhead line also can't avoid 10kV transformer to make the thunderbolt damage according to the arrester, provide a 10kV joins in marriage net overhead line join in marriage and become lightning protection wiring structure to the perfect condition that 10kV transformer damaged when avoiding the distribution network to receive the thunderbolt.
In order to solve the problems, the distribution transformer lightning protection wiring structure of the 10kV distribution network overhead line comprises the 10kV distribution network overhead line, a drop-out fuse, a lightning arrester, a lightning protection inductance coil and a distribution transformer, wherein the tail end of the 10kV distribution network overhead line is connected with an electric pole; the drop-out fuse, the lightning arrester, the lightning protection inductance coil and the distribution transformer are arranged on an electric pole and are connected in sequence through leads; the tail end of the electric pole is a pole tower, and a lightning-protection cross arm is arranged on the pole tower; the lightning protection inductance coil is arranged on the lightning protection cross arm; the conductor is 70mm in cross section2The insulated overhead line can ensure that the heat generated when the normal load current flows through the conducting wire for a long time can not damage the insulating layer.
In particular, the high-voltage incoming line side of the distribution transformer is connected with a lightning protection inductance coil.
In particular, the inductance value of the lightning protection inductance coil can reach more than 10 mH.
In particular, the lightning protection inductance coil is a conductor with the sectional area of 70mm2The insulated overhead line is wound on a die.
Particularly, the mould is cylindrical, and wherein one end of mould is provided with the gold utensil, is equipped with the trompil on this gold utensil, and this trompil can be installed lightning protection inductance coils on lightning-arrest cross arm with screw and nut, mould intensity can support lightning protection inductance coils whole weight for a long time.
The utility model has the advantages that:
the utility model discloses being struck by lightning at distribution overhead line, when the thunder and lightning overvoltage invaded distribution transformer, can reducing instantaneous energy density, make overvoltage peak value fall to within joining in marriage single transformer and endure the scope, avoid the transformer to receive the thunderbolt damage. The distribution transformer is usually installed at the tail end of a distribution network branch line, and after the overhead line is led to a tail end tower, the safety distance between a wire and the tower is avoided from being insufficient through the transition of a lightning-protection cross arm; the utility model discloses a drop out fuse can play the guard action when joining in marriage and become high-pressure inlet wire side and join in marriage the alternate short circuit of transformer inside. 2 overhead lines are connected in parallel, one overhead line is connected into a lightning arrester, and the other overhead line is connected to a lightning protection inductance coil; the high-voltage power supply is connected to the high-voltage wire inlet side of the distribution transformer after passing through the lightning protection inductance coil; finally, a low-voltage distribution box is connected to the low-voltage side of the distribution transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of an embodiment of the present invention;
FIG. 2 is a diagram of the field installation of the embodiment of the present invention;
in the figure: 1. a drop-out fuse; 2. a lightning arrester; 3. a lightning protection inductance coil; 4. a distribution transformer.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
As shown in fig. 1 and fig. 2, the distribution transformer lightning protection wiring structure of a 10kV distribution network overhead line of the embodiment includes a 10kV distribution network overhead line, a drop-out fuse 1, a lightning arrester 2, a lightning protection inductance coil 3, and a distribution transformer 4. The end of the 10kV distribution network overhead line is connected with an electric pole. The drop-out fuse 1, the lightning arrester 2, the lightning protection inductance coil 3 and the distribution transformer 4 are installed on an electric pole and are sequentially connected through a wire. The end of the electric pole is a pole tower, and a lightning-protection cross arm is arranged on the pole tower. Lightning protection inductance coils 3 are arranged on the lightning-protection cross arm. The conductor has a cross-sectional area of 70mm2The insulated overhead line can ensure that the heat generated when the normal load current flows through the conducting wire for a long time can not damage the insulating layer. The high-voltage incoming line side of the distribution transformer 4 is connected with the lightning protection inductance coil 3. The inductance value of the lightning protection inductance coil can reach more than 10 mH. The cross section area of the lightning protection inductance coil is 70mm2The insulated overhead line is wound on a die. The mould is cylindrical, and wherein one end of mould is provided with the gold utensil, is equipped with the trompil on this gold utensil, and this trompil can be installed lightning protection inductance coils on lightning-arrest cross arm with screw and nut, mould intensity can support lightning protection inductance coils whole weight for a long time. 2 overhead lines are connected in parallel, one overhead line is connected into the lightning arrester 2, and the other overhead line is connected to the lightning protection inductance coil 3; after passing through the lightning protection inductance coil 3, the high-voltage power supply is connected to the high-voltage wire inlet side of a distribution transformer 4; finally, a low-voltage distribution box is connected to the low-voltage side of the distribution transformer 4.
The working principle and the using method of the utility model are as follows:
under the normal operation condition, the lightning arrester 2 bears power frequency voltage, the interior of the lightning arrester is in an on-off state, and current can normally enter the transformer; when the line is struck by lightning and the lightning wave passes through the drop-out fuse 1 before invading the distribution transformer 4, the overvoltage acting on the lightning arrester 2 exceeds the threshold value, the lightning arrester 2 is in a conducting state, and the energy of the lightning can be introduced into the ground. However, if the lightning energy is too large, the distribution transformer cannot be completely protected by the lightning arrester 2 alone, or the grounding grid of the transformer area does not reach the standard, the grounding resistance is too large, the lightning arrester 2 does not work, and the lightning waves continuously invade the transformer. Lightning wave gets into the utility model discloses an at first can pass through lightning protection inductance coils 3 before the transformer, the most energy of thunder and lightning has introduced the ground by arrester 2 this moment, the overvoltage that the surplus energy produced is through lightning protection inductance coils 3, its peak value will be drawn down, the energy release incident increases, energy density descends, according to existing research, as long as lightning protection inductance coils 3's inductance value reaches more than 10mH, just can be within the distribution transformer 4 tolerance range with the lightning overvoltage peak value restriction, reach the purpose that the protection transformer was struck by lightning and damaged.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes and modifications can be made by the owner within the scope of the appended claims, and the protection scope of the present invention should not be exceeded by the claims.

Claims (5)

1. The utility model provides a 10kV joins in marriage net overhead line's distribution transformer lightning protection wiring structure which characterized in that: the lightning protection system comprises a 10kV distribution network overhead line, a drop-out fuse, a lightning arrester, a lightning protection inductance coil and a distribution transformer, wherein the tail end of the 10kV distribution network overhead line is connected with an electric pole; the drop-out fuse, the lightning arrester, the lightning protection inductance coil and the distribution transformer are arranged on an electric pole and are connected in sequence through leads; the tail end of the electric pole is a pole tower, and a lightning-protection cross arm is arranged on the pole tower; the lightning protection inductance coil is arranged on the lightning protection cross arm; the conductor is 70mm in cross section2The insulated overhead line can ensure that the heat generated when the normal load current flows through the conducting wire for a long time can not damage the insulating layer.
2. The distribution transformer lightning protection wiring structure of the 10kV distribution network overhead line, according to claim 1, is characterized in that: and the high-voltage incoming line side of the distribution transformer is connected with a lightning protection inductance coil.
3. The distribution transformer lightning protection wiring structure of the 10kV distribution network overhead line, according to claim 1, is characterized in that: the inductance value of the lightning protection inductance coil can reach more than 10 mH.
4. The distribution transformer lightning protection wiring structure of the 10kV distribution network overhead line, according to claim 1, is characterized in that: the lightning protection inductance coil is a conductor with the sectional area of 70mm2The insulated overhead line is wound on a die.
5. The distribution transformer lightning protection wiring structure of the 10kV distribution network overhead line, according to claim 4, is characterized in that: the mould is cylindrical, and wherein one end of mould is provided with the gold utensil, is equipped with the trompil on this gold utensil, and this trompil can be installed lightning protection coil on lightning-arrest cross arm with screw and nut, mould intensity can support the whole weight of lightning protection coil for a long time.
CN201922182613.2U 2019-12-09 2019-12-09 Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV Active CN211320890U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922182613.2U CN211320890U (en) 2019-12-09 2019-12-09 Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922182613.2U CN211320890U (en) 2019-12-09 2019-12-09 Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV

Publications (1)

Publication Number Publication Date
CN211320890U true CN211320890U (en) 2020-08-21

Family

ID=72082476

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922182613.2U Active CN211320890U (en) 2019-12-09 2019-12-09 Join in marriage and become lightning protection wiring structure of joining in marriage net overhead line of 10kV

Country Status (1)

Country Link
CN (1) CN211320890U (en)

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