High-resistance loop arrangement structure

Abstract

The utility model relates to the technical field of electric power, and discloses a high-resistance loop arrangement structure, which comprises a high-resistance firewall and a high-resistance lightning arrester or a post insulator arranged at the end part of the high-resistance firewall, wherein the end position of the high-resistance firewall refers to one end, close to the transportation road side, of the high-resistance firewall. According to the utility model, the problems that a high-resistance lightning arrester equipment support in the prior art is large in work amount, inconvenient to overhaul and carry, inconvenient to maintain and repair and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to a high-resistance circuit arrangement structure. Background Art

[0002] When the 500kV outgoing line of a 500kV substation is long, in order to limit the power frequency overvoltage level of the line, a line high-voltage shunt reactor (referred to as line high-voltage reactor) and a neutral point small reactor are often configured. Since the transmission power of the line changes at any time with the power system load of the system, the line is disconnected when transmitting different powers to achieve flexible switching between the two operating conditions of the line with and without high-voltage reactors. After the line high-voltage reactor disconnector is set, the high-voltage reactor and the line outgoing line arrester may have different operating conditions that require high-voltage reactor operation and do not require high-voltage reactor operation. Therefore, it is necessary to configure the lightning arrester in the line high-voltage reactor circuit at a longer electrical distance (compared with not setting the line high-voltage reactor disconnector). In areas with frequent lightning activities, it is often necessary to set up high-voltage reactor arresters to protect the safe operation of high-voltage reactor electrical equipment. In areas with less lightning activities, the high-voltage reactor arrester can also be cancelled after calculation, and the line arrester can be used to protect the line high-voltage reactor.

[0003] In the conventional substation design, the high-voltage reactor area of ​​the line is arranged in the order of: "outgoing voltage transformer-lightning arrester-disconnector-high-voltage reactor arrester or pillar insulator-high-voltage reactor body-high-voltage reactor neutral point-neutral point small reactor". Due to the large transportation size of the line high-voltage reactor body, it is necessary to set up a special transportation road between the high-voltage reactor disconnector and the high-voltage reactor, and the width of the road is determined according to the current transportation size of the high-voltage reactor. Assuming that the line high-voltage reactor is equipped with a high-voltage reactor arrester, the disconnector and the high-voltage reactor arrester are arranged on both sides of the high-voltage reactor transportation road, and soft wires are used for electrical connection. The high-voltage reactor transportation road is calibrated for live distance according to the transportation size of the high-voltage reactor body. If a high-voltage reactor arrester is not required, pillar insulators need to be set on the high-voltage reactor road side of the line to support the connecting wires of the disconnector across the road.

[0004] In order to ensure the energized distance requirement between the high-voltage lightning arrester grading ring and the high-voltage fire wall, the high-voltage lightning arrester is set outside the high-voltage oil pit, and a high-voltage area cable trench is also set between the lightning arrester equipment bracket and the high-voltage fire wall. The high-voltage lightning arrester is arranged in a manner directly opposite to the high-voltage bushing of the high-voltage body, and the connecting conductors are connected in the order of: disconnector-high-voltage lightning arrester-high-voltage high-voltage bushing. When the high-voltage current needs to be inspected and disassembled, the lightning arrester on the road side of the high-voltage needs to be dismantled as a whole, and its equipment bracket needs to be made into a detachable bracket.

[0005] The plane sections of the high-resistance area layout of the conventional design are as follows: Figures 1 to 8 shown.

[0006] In summary, the existing technology has the following problems: the high-voltage lightning arrester equipment bracket has a large amount of engineering work, the distance between the high-voltage lightning arrester transportation road and the high-voltage lightning arrester fence is long, it is not convenient to directly transport the high-voltage lightning arrester for inspection and maintenance, and it is not convenient for operation and maintenance. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model provides a high-resistance circuit arrangement structure to solve the problems of the prior art such as large engineering workload of high-resistance lightning arrester equipment brackets, inconvenient inspection and transportation, and inconvenient maintenance and inspection.

[0008] The technical solution adopted by the utility model to solve the above problems is:

[0009] A high-voltage circuit arrangement structure includes a high-voltage fire wall, and a high-voltage lightning arrester or a support insulator arranged at the end position of the high-voltage fire wall; wherein the end position of the high-voltage fire wall refers to one end of the high-voltage fire wall close to the transport road side.

[0010] As a preferred technical solution, the high-voltage lightning arrester or the post insulator is arranged at the cut-angle structure position on the high-voltage fire wall.

[0011] As a preferred technical solution, the cut-angle structure on the high-resistance fire wall is a Z-shaped structure.

[0012] As a preferred technical solution, it also includes an isolating switch and a soft wire, and the high-resistance lightning arrester or the support insulator is electrically connected to the isolating switch through the soft wire.

[0013] As a preferred technical solution, in phase B, the high-voltage fire wall, the high-voltage lightning arrester or the post insulator, and the disconnector are located on the same straight line.

[0014] As a preferred technical solution, in phase A and phase C, the angle between the connection line between the high-voltage fire wall and the high-voltage lightning arrester or post insulator and the connection line between the high-voltage lightning arrester or post insulator and the disconnector is (0°, 30°).

[0015] As a preferred technical solution, it also includes an equipment bracket arranged on the firewall.

[0016] As a preferred technical solution, the equipment bracket is welded to the firewall or bolted to the firewall.

[0017] As a preferred technical solution, it also includes a high-resistance area cable trench arranged on the high-resistance fire wall close to the transportation road side.

[0018] As a preferred technical solution, the distance between the high oil-resistant pit and the center line of the transportation road is 6m to 10m.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model saves the engineering workload of the high-voltage lightning arrester equipment bracket, shortens the distance between the high-voltage lightning arrester transportation road and the high-voltage lightning arrester fence, and facilitates the direct transportation of the high-voltage lightning arrester for maintenance while ensuring the integrity of the electrical connection function of the high-voltage lightning arrester circuit, thus saving engineering construction investment and facilitating operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the plane layout diagram of the high-resistance area of ​​the line for the conventional layout scheme;

[0022] Figure 2 for Figure 1 One of the partial enlarged pictures;

[0023] Figure 3 for Figure 1 The second partial enlarged picture;

[0024] Figure 4 for Figure 1 The third partial enlarged picture;

[0025] Figure 5 This is the cross-section diagram of the high-resistance area of ​​the line in the conventional layout scheme;

[0026] Figure 6 for Figure 5 One of the partial enlarged pictures;

[0027] Figure 7 for Figure 5 The second partial enlarged picture;

[0028] Figure 8 for Figure 5 The third partial enlarged picture;

[0029] Fig. 9 Compact electrical layout plan for high resistance circuit;

[0030] Fig.10 for Fig. 9 One of the partial enlarged pictures;

[0031] Fig.11 for Fig. 9 The second partial enlarged picture;

[0032] Fig.12 for Fig. 9 The third partial enlarged picture;

[0033] Fig.13 This is a compact cross-sectional view of a high resistance circuit;

[0034] Fig.14 for Fig.13 One of the partial enlarged pictures;

[0035] Fig.15 for Fig.13 The second partial enlarged picture;

[0036] Fig.16 for Fig.13 The third partial enlarged picture;

[0037] Fig.17 Layout diagram of the utility model for high altitude substations;

[0038] Fig.18 for Fig.17 One of the partial enlarged pictures;

[0039] Fig.19 for Fig.17 The second partial enlarged picture;

[0040] Fig. 20 for Fig.17 The third partial enlarged image. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0042] Example 1

[0043] like Figures 1 to 20 As shown, the utility model proposes a novel compact arrangement structure of a 500kV line high-voltage circuit with an isolating switch.

[0044] The utility model adjusts the arrangement of the line high-voltage resistors, arranges the high-voltage firewall directly opposite to the isolating switch, arranges the high-voltage lightning arrester or the support insulator at the cut-angle special-shaped structure position on the high-voltage firewall, and directly connects the isolating switch through a soft wire.

[0045] The utility model saves the engineering workload of the high-voltage lightning arrester equipment bracket, shortens the distance between the high-voltage lightning arrester transportation road and the high-voltage lightning arrester fence, and facilitates the direct transportation of the high-voltage lightning arrester for maintenance while ensuring the integrity of the electrical connection function of the high-voltage lightning arrester circuit, thus saving engineering construction investment and facilitating operation and maintenance.

[0046] The specific technical implementation method of the utility model is as follows:

[0047] 1) Adjust the overall layout of the high-voltage and fire walls. On the basis of meeting the fire protection requirements of the oil pit and fire wall, place the high-voltage and fire wall directly opposite the isolating switch.

[0048] 2) The high-voltage lightning arrester or post insulator is arranged at the end of the high-voltage fire wall (close to the transportation road side), and an equipment bracket is set on the fire wall, which is installed on the embedded parts of the fire wall by welding (or installed by driving through bolts on the fire wall). In order to avoid excessive height difference between the connecting conductors of the high-voltage lightning arrester or post insulator and the high-voltage bushing and disconnector terminal, it is preferred to cut the fire wall at this position into a "Z"-shaped structure similar to a stretch (the premise of ensuring the fireproof size requirements). This structure can reduce the height of the high-voltage lightning arrester or post insulator equipment terminal while ensuring the energized distance requirement of the high-voltage lightning arrester or post insulator grading ring to the fire wall.

[0049] 3) To adapt to the phase-to-phase distance and high-voltage external dimensions of electrical equipment at different altitudes. It is preferred to arrange the middle (B phase) phase fire wall arrester (or pillar insulator) directly opposite the middle phase of the disconnector, that is, the high-voltage fire wall, high-voltage lightning arrester (or pillar insulator), and disconnector are located on the same straight line); the connecting conductors on both sides (A and C phases) are connected slightly tilted, that is, the angle between the connection line between the high-voltage fire wall and the high-voltage lightning arrester (or pillar insulator) and the connection line between the high-voltage lightning arrester (or pillar insulator) and the disconnector is (0°, 30°). This ensures the live distance requirements from the arrester grading ring on the fire wall to the grading ring of the high-voltage high-voltage bushing of the adjacent phase.

[0050] 4) Outside the high-voltage oil pit, close to the transport road side, only a high-voltage area cable trench is set up. Since the installation position of the high-voltage lightning arrester or support insulator is optimized to the end of the firewall, the high-voltage lightning arrester can be easily and directly entered and exited during operation, maintenance and transportation without dismantling the equipment and bracket.

[0051] 5) After the installation position of the high-voltage lightning arrester or support insulator equipment is moved to the high-voltage fire wall, a high-voltage area cable trench is set only on the side of the high-voltage fire wall close to the transportation road. The size between the high-voltage oil pit and the transportation road is compressed smaller than that of the conventional solution.

[0052] 6) For busbar high-voltage lightning arresters (which must have high-voltage lightning arresters) and line high-voltage lightning arresters without disconnectors (most of them do not have high-voltage lightning arresters and are shared with line outlet lightning arresters), this technical solution can also be used for optimal design.

[0053] For conventional 500kV substations at an altitude of 1000m or less, the 500kV outgoing line frame is usually 26m. After adopting this technology, the plane and cross-section of the compact electrical layout of the high-voltage circuit are as follows: Figures 9 to 16 shown.

[0054] After adopting this technology, compared with the conventional electrical layout scheme, the size of the high-resistance oil pit in the high-resistance area to the transportation road can be compressed by 2m, which has a significant effect in saving land resources. During the high-resistance transportation and relocation process, there is no obstruction of any electrical equipment and brackets, which greatly facilitates operation, inspection and maintenance.

[0055] At present, the width of the outgoing line frame is relatively small at conventional altitudes of 1000m and below. As a result, in areas with an altitude of 1000m and above, the phase-to-phase and phase-to-ground energized distances of electrical equipment increase with the increase in altitude, which has a significant impact on the outgoing line frame of 500kV lines. For GIS distribution devices, at conventional altitudes of 1000m and below, the width of the outgoing line frame can be 26m. When the altitude rises to 2000m and 3000m, the width Lgj of the outgoing line frame increases to 28m and 32m respectively, and the phase-to-phase Lxj and phase-to-ground Lxd energized distance requirements increase significantly, resulting in an increase in the distance between phase electrical equipment. However, for line high-voltage reactors, under different altitude conditions, the length and width dimensions Lgk1 and Lgk2 of the high-voltage reactor body change very little, and the spacing Lfh between high-voltage reactor protective walls also changes very little. When the altitude rises to 2500m-3000m, the arrester on the three-phase high-voltage fire wall can be directly connected to the isolating switch, and the electrical layout is more beautiful. For example, after adopting this technology, the layout of the substation at an altitude of 2500m is as follows: Figures 17 to 20 shown.

[0056] For busbar high-voltage reactor circuits and line high-voltage reactor circuits without isolating switches, the optimized design can also be carried out by referring to this technical solution.

[0057] As described above, the utility model can be implemented well.

[0058] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. A high resistance loop arrangement structure, characterized in that: It includes a high-voltage fire wall, and a high-voltage lightning arrester or a pillar insulator arranged at the end position of the high-voltage fire wall; wherein the end position of the high-voltage fire wall refers to one end of the high-voltage fire wall close to the transport road side.

2. A high resistance circuit arrangement structure according to claim 1, characterized in that: The high-voltage lightning arrester or the post insulator is arranged at the cut-angle structure position on the high-voltage fire wall.

3. A high resistance circuit arrangement structure according to claim 2, characterized in that: The cut-angle structure on the high-resistance fire wall is a Z-shaped structure.

4. A high resistance circuit arrangement structure according to claim 1, characterized in that: It also includes an isolating switch and a soft wire. The high-resistance lightning arrester or the support insulator is electrically connected to the isolating switch through the soft wire.

5. A high resistance circuit arrangement structure according to claim 4, characterized in that: In phase B, the high-voltage fire wall, high-voltage lightning arrester or post insulator, and disconnector are located on the same straight line.

6. A high resistance circuit arrangement structure according to claim 5, characterized in that: In phase A and phase C, the angle between the connection line between the high-voltage fire wall and the high-voltage lightning arrester or post insulator and the connection line between the high-voltage lightning arrester or post insulator and the disconnector is (0°, 30°).

7. A high resistance circuit arrangement structure according to claim 1, characterized in that: Also included is an equipment bracket arranged on the firewall.

8. A high resistance circuit arrangement structure according to claim 7, characterized in that: The equipment bracket is welded to the firewall or bolted to the firewall.

9. A high resistance circuit arrangement structure according to claim 1, characterized in that: It also includes a high-resistance area cable trench arranged on the high-resistance fire wall close to the transportation road side.

10. A high resistance circuit arrangement structure according to claim 1, characterized in that: It also includes high oil-resistant pits, and the distance between the high oil-resistant pits and the center line of the transportation road is 6m to 10m.

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