Power grid layout structure and system based on ice melting function

Abstract

The present invention provides a power grid layout structure and system based on ice melting function, including a three-phase line on the non-ice melting side of the transformer and a three-phase line on the ice melting side of the transformer that provides ice melting power; the three-phase line on the ice melting side of the transformer is converted in turn, and two phases in the three-phase line are respectively connected in parallel in pairs, and the two phases after parallel connection and the non-parallel phase form an operating loop to reduce the loop impedance, thereby achieving the effect of extending the ice melting distance and improving the ice melting speed. The present invention effectively solves the ice melting problem in extreme weather such as ice disasters by coordinating parallel operation and phase-missing operation. Compared with three-phase direct short-circuit ice melting, the present invention not only significantly extends the ice melting distance, but also more efficiently improves the three-phase ice melting speed. The ice melting effect of transmission and distribution lines of different voltage levels is guaranteed, the operation is simple and easy, the safety risk is low, the application range is wide, and the asset investment of power grid enterprises is greatly saved, so it has strong practicality.

Description

Technical Field

[0001] The invention relates to the technical field of electrical engineering, and in particular to a power grid arrangement structure and system based on an ice melting function. Background Art

[0002] The impact of extreme weather such as rain, snow, and freezing on the power industry cannot be underestimated. If the icing problem of the lines cannot be dealt with in time after the snow, it will have a huge impact on the operation of the power grid and the reliability of power supply to users.

[0003] In recent years, after several drills on the step-down short-circuit AC de-icing of power grid transformers and the AC de-icing of generators, it is found that although this method is theoretically feasible, the prior art method of step-down short-circuit AC de-icing of distribution transformers still has the following disadvantages:

[0004] (1) The ice melting voltage is only 400V. According to the common LGJ70--95 conductor in the ice-walking area, it can only melt ice for about 1.3 kilometers. However, the actual ice-walking area is most common at about 2-5 kilometers. The ice melting distance is too short and needs to be carried out step by step, which is time-consuming and slow.

[0005] (2) The workers have to work hard and have low work efficiency. In addition, there is ice on site, the working environment is poor, and the safety risks are high.

[0006] In summary, the existing technology lacks an efficient ice-melting method to meet the emergency demand for power supply in extreme weather such as ice disasters. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a power grid layout structure and system based on the ice melting function, which effectively solves the ice melting problem in extreme weather such as ice disasters by coordinating parallel operation and phase-missing operation. Compared with three-phase direct short-circuit ice melting, the present invention more efficiently extends the ice melting distance and improves the three-phase ice melting speed, and has strong practicality.

[0008] In a first aspect, an embodiment of the present invention provides a power grid arrangement structure based on an ice melting function, including a three-phase line on a non-ice melting side of a transformer and a three-phase line on an ice melting side of the transformer;

[0009] The three-phase circuit on the ice-melting side of the transformer is converted alternately, and two phases in the three-phase circuit are connected in parallel in pairs. The two parallel phases and the non-parallel phase form an operating loop to achieve the effect of extending the ice-melting distance and improving the ice-melting speed.

[0010] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation of the first aspect, wherein the non-ice-melting side three-phase line of the transformer includes an A-phase non-ice-melting side line, a B-phase non-ice-melting side line and a C-phase non-ice-melting side line.

[0011] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation of the first aspect, wherein the three-phase line on the ice-melting side of the transformer includes an A-phase ice-melting side line, a B-phase ice-melting side line and a C-phase ice-melting side line.

[0012] In combination with the second possible implementation of the first aspect, an embodiment of the present invention provides a third possible implementation of the first aspect, wherein, when the A-phase ice-melting side line is melted, the B-phase ice-melting side line and the C-phase ice-melting side line are connected in parallel.

[0013] In combination with the second possible implementation of the first aspect, an embodiment of the present invention provides a fourth possible implementation of the first aspect, wherein, when the B-phase ice-melting side line is melted, the A-phase ice-melting side line and the C-phase ice-melting side line are connected in parallel.

[0014] In combination with the second possible implementation of the first aspect, an embodiment of the present invention provides a fifth possible implementation of the first aspect, wherein, when the C-phase ice-melting side line is melted, the A-phase ice-melting side line and the B-phase ice-melting side line are connected in parallel.

[0015] In combination with the third possible implementation manner of the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, which further includes:

[0016] When the A-phase ice-melting side line is ice-melting, the B-phase line of the transformer operates with a missing phase.

[0017] In combination with the fourth possible implementation manner of the first aspect, the embodiment of the present invention provides a seventh possible implementation manner of the first aspect, which further includes:

[0018] When the B-phase ice-melting side line is ice-melting, the A-phase line of the transformer operates with a missing phase.

[0019] In combination with the fifth possible implementation of the first aspect, the embodiment of the present invention provides an eighth possible implementation of the first aspect, which further includes:

[0020] When the ice-melting side line of the C phase melts, the B phase line of the transformer operates with a missing phase.

[0021] In a second aspect, an embodiment of the present invention provides a power grid deployment system based on an ice melting function, including the power grid deployment structure based on an ice melting function as described above, and further including:

[0022] The A-phase ice-melting side line, the B-phase ice-melting side line and the C-phase ice-melting side line of the transformer are switched in parallel in turn to increase the three-phase ice-melting speed.

[0023] The present invention provides a power grid layout structure and system based on ice melting function, including a three-phase line on the non-ice melting side of the transformer and a three-phase line on the ice melting side of the transformer; the three-phase line on the ice melting side of the transformer is converted in turn, and two phases in the three-phase line are respectively connected in parallel in pairs, and the two parallel phases and the non-parallel phase form an operating loop to reduce the loop impedance, thereby achieving the effect of extending the ice melting distance and improving the ice melting speed. . The present invention effectively solves the ice melting problem in extreme weather such as ice disasters by coordinating parallel operation and phase-missing operation. Compared with three-phase direct short-circuit ice melting, the present invention more efficiently extends the ice melting distance and improves the three-phase ice melting speed, and has strong practicality.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the wiring structure of a transformer in normal operation according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the wiring layout structure when the A phase melts ice provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the wiring layout structure in the case of ice melting in phase B provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the wiring layout structure in the case of ice melting of phase C provided by an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of a step-down transformer ice melting circuit circuit provided in an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of forward ice melting and reverse ice melting provided by an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the transformer missing-phase operation loop impedance provided by an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of loop impedance for three-phase direct short-circuit ice melting provided in an embodiment of the present invention.

[0035] icon:

[0036] 100- three-phase line on the non-melting side; 200- three-phase line on the melting side. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] At present, the impact of extreme weather such as rain, snow, and freezing on the power industry cannot be underestimated. If the icing problem of the lines cannot be dealt with in time after the snow, it will have a huge impact on the operation of the power grid and the power supply reliability of users.

[0039] The snow disaster in 2008 left a deep impression on people. Most parts of southern China and the eastern part of the northwest region experienced continuous and large-scale extreme weather of low temperature, rain, snow and freezing, which was rare since the founding of the People's Republic of China, causing extremely serious ice and snow disasters. The ice and snow disasters have caused 17 provinces (municipalities and autonomous regions) including Guizhou, Hunan, Hubei, Anhui, Jiangsu, Shaanxi and Gansu to suffer varying degrees, and the victims have exceeded 100 million.

[0040] For example, in a certain place, 15 500kV substations were completely out of service due to the disaster, accounting for 7.54% of the total number of 500kV substations in the disaster area; 86 220kV substations were completely out of service, accounting for 5.97% of the total number of 220kV substations in the disaster area. 119 500kV power lines were out of service due to the disaster, accounting for 19.01% of the total number of 500kV lines in the disaster area; 343 220kV lines were out of service due to the disaster, accounting for 9.38% of the total number of 220kV lines in the disaster area. The rain, snow and freezing disasters caused 678 500kV towers to collapse and 295 to be damaged, accounting for about 0.742% of the total number of 500kV towers in the disaster-stricken area. The ice disaster caused 1,432 220kV towers to collapse and 586 to be damaged, accounting for about 0.697% of the total number of 220kV towers in the disaster-stricken area.

[0041] During the snowstorm, the temperature in most parts of the south was around ±3℃. Under such conditions, it is very easy for power grid equipment to freeze. Rain and snow adhered to the surface of power grid equipment and formed ice. The ice on the transmission lines and towers across mountainous areas was particularly serious. Transmission lines in parts of central and eastern China were covered with 40 to 60 mm thick ice. When the ice was severe, the thickness of the ice increased by 1 mm per hour. According to the construction specifications of my country's transmission lines, high-voltage lines are protected against natural disasters that occur once in 30 years (taking into account factors such as resource conservation and reasonable electricity prices). The once-in-30-year rain, snow and freezing climate means that the standard for protecting the conductors from ice cannot exceed 10 mm. In other words, transmission lines designed according to the standard are difficult to withstand 60 mm thick ice. When the wires are covered with heavy icicles, the lateral pulling force on the power poles is very huge. Especially in the case of strong winds, many wires danced greatly. The "resonance" effect is enough to pull down steel towers weighing dozens of tons, exacerbating the damage to the power transmission and transformation equipment. In addition, after ice forms on the transmission equipment, the insulation level drops greatly, and many devices experience "ice flash" discharge, causing a large number of devices to trip due to faults. Especially in the process of rising temperature and melting of ice on the lines, line flashover accidents are very likely to occur, posing a serious threat to the safe operation and reliable power supply of the power grid.

[0042] In recent years, through the practice of several drills of various measures such as vehicle-mounted DC, AC short-circuit ice melting, and generator zero-start current ice melting, it has been proved that the vehicle-mounted DC ice melting device has a high failure rate, large investment, heavy and inconvenient to carry, and is rarely used; the ice melting transformer is more flexible and easy to carry, but the on-site operation volume is large and the safety risk is high; the generator is as heavy and inconvenient to carry as the vehicle-mounted DC. Although the use of these methods for ice melting has a certain degree of feasibility in theory, the existing distribution transformer step-down short-circuit AC ice melting method still cannot achieve a satisfactory ice melting effect. The distribution transformer AC ice melting carried out in recent years can basically melt the ice on the ice-covered line, but because the ice melting voltage is only 400V and the three-phase ice melting is directly short-circuited, it can only melt about 1.3 kilometers at a time, but the actual ice-walking area is most common at about 2-5KM. The ice melting distance is too short at a time and must be carried out step by step, which is time-consuming, slow, labor-intensive, and inefficient. In addition, there is ice on site, the working environment is poor, and the safety risk of the operation is high.

[0043] In summary, the prior art lacks an efficient ice melting method to meet the emergency demand for power supply in extreme weather such as ice disasters. Based on this, the grid layout structure and system based on ice melting function provided by the embodiment of the present invention can effectively solve the ice melting problem in extreme weather such as ice disasters, and effectively extend the ice melting distance by switching the three phases A, B, and C in parallel, and effectively improve the ice melting speed on this basis.

[0044] To facilitate understanding of this embodiment, the grid arrangement structure based on the ice melting function disclosed in the embodiment of the present invention is first introduced in detail.

[0045] Embodiment 1:

[0046] In the embodiment of the present invention, the voltage on the non-ice-melting side of the transformer is the voltage for providing the ice-melting power supply, and the ice-melting side provides the ice-melting voltage. Here, the ice-melting voltage on the ice-melting side affects the ice-melting distance. However, it should be noted that the non-ice-melting side actually only represents the input side of the electric energy, and the ice-melting side is the output side of the power supply. In practical applications, the non-ice-melting side can be used as the ice-melting side, and the ice-melting side can also be used as the ice-melting side, that is, the ice-melting side can be the primary side of the transformer or the secondary side of the transformer. For the convenience of description and understanding, the embodiment of the present invention uses the ice-melting side as one end of the output ice-melting voltage to melt ice.

[0047] The grid arrangement structure based on the ice melting function includes a three-phase line on the non-ice melting side of the transformer and a three-phase line on the ice melting side of the transformer;

[0048] The three-phase circuit on the ice-melting side of the transformer is converted alternately, and two phases of the three-phase circuit are connected in parallel in pairs. The two parallel phases and another phase form an operating loop to reduce the loop impedance, thereby achieving the effect of extending the ice-melting distance and increasing the ice-melting speed.

[0049] Specifically, the embodiment of the present invention proposes for the first time a method of melting ice when the transformer is operating in the absence of a phase, and proposes for the first time a technology of melting ice when the line conductors are connected in parallel. The technical effects produced by the ice-melting technology provided by the embodiment of the present invention are mainly reflected in two aspects. One is that the ice-melting distance is extended, and the other is that the ice-melting speed is increased. First, in terms of the ice-melting distance, two of the three-phase conductors of the ice-melting line are connected in parallel, and then form a loop with the non-parallel phase. When the transformer is operating in the absence of a phase, the non-parallel phase conductors melt and the temperature rise is fast. Assuming that the impedance of the three-phase line for melting ice is R, the impedance of the parallel conductor is 0.5R, and then connected in series with the non-parallel phase to form a loop, the total impedance of the loop is 1.5R, (see Figure 7 ) If the three phases are short-circuited directly to melt the ice, the impedance of the same loop is 2R, and the total loop impedance is √3R (see Figure 8 ), compared with the parallel conductors, ice melting reduces the impedance by 1.33 times, and the ice melting distance is inversely proportional to the conductor impedance, that is, compared with the three-phase direct short circuit, the ice melting distance is extended by 1.33 times; secondly, in terms of ice melting speed, the three phases A, B, and C are switched in parallel in turn, such as: when melting phase A, the two phases BC in parallel are also melting at the same time, when switching to melting phase B, the two phases AC in parallel are also melting at the same time, and so on, which ensures the symmetry of ice melting and effectively improves the ice melting speed on the basis of extending the ice melting distance. Therefore, the ice melting speed of the three phases is improved.

[0050] It should be noted that after parallel connection, the three phases A, B, and C are switched in parallel at preset intervals, thereby improving the three-phase ice melting speed. The specific preset time here will be determined according to the actual local conditions, ice thickness, grid voltage level and other factors, but compared with the prior art, the overall solution is not constrained by the environment, and the changes in various factors will not affect the technical effects of the embodiments of the present invention, and the ice melting distance and ice melting speed are significantly improved.

[0051] like Figure 1 Shown is the transformer wiring layout circuit diagram under normal operating conditions.

[0052] According to an exemplary embodiment of the present invention, a non-ice-melting-side three-phase line 100 of a transformer includes an A-phase non-ice-melting-side line, a B-phase non-ice-melting-side line, and a C-phase non-ice-melting-side line.

[0053] According to an exemplary embodiment of the present invention, the ice-melting-side three-phase line 200 of the transformer includes an A-phase ice-melting-side line, a B-phase ice-melting-side line, and a C-phase ice-melting-side line.

[0054] According to an exemplary embodiment of the present invention, referring to Figure 2 When the A-phase ice-melting side line is being melted, the B-phase ice-melting side line and the C-phase ice-melting side line are connected in parallel.

[0055] Specifically, when the A phase is melting, the B phase conductor on the melting side of the transformer is connected in parallel with the C phase conductor (B phase is missing) to form a single-phase AC melting with the A phase.

[0056] According to an exemplary embodiment of the present invention, referring to Figure 3 When the B-phase ice-melting side line is being melted, the A-phase ice-melting side line and the C-phase ice-melting side line are connected in parallel.

[0057] Specifically, when the B phase is melting, the A phase conductor and the C phase conductor (A phase is missing) on ​​the melting side of the transformer are connected in parallel to form a single-phase AC melting with the B phase.

[0058] According to an exemplary embodiment of the present invention, referring to Figure 4 When the C-phase ice-melting side line is being melted, the A-phase ice-melting side line and the B-phase ice-melting side line are connected in parallel.

[0059] Specifically, when the C phase is melting, the A phase conductor on the melting side of the transformer is connected in parallel with the B phase conductor (the B phase is missing) to form a single-phase AC melting with the C phase.

[0060] The decoupling strand of the power grid de-icing wiring layout provided in the embodiment of the present invention is achieved by connecting two phases of the three-phase conductors of the de-icing line in parallel with the non-parallel phase to form a loop, and connecting them to the two phases on the de-icing side of the transformer to make it run in phase loss. The parallel conductors can reduce the impedance, thereby extending the de-icing distance. It should be noted that the technical solution provided by this new embodiment is not only applicable to distribution networks, but can also be applied to transmission lines of any voltage level. The de-icing distance using the technical solution of the embodiment of the present invention is positively correlated with the de-icing voltage applied to the line. The higher the de-icing voltage applied to the line, the longer the de-icing distance. According to an exemplary embodiment of the present invention, it also includes:

[0061] like Figure 2 As shown in the figure, when the ice-melting side line of phase A melts, the phase B line of the transformer operates with a missing phase.

[0062] According to an exemplary embodiment of the present invention, it also includes:

[0063] like Figure 3 As shown, when the B-phase ice-melting side line melts, the A-phase line of the transformer operates with a missing phase.

[0064] According to an exemplary embodiment of the present invention, it also includes:

[0065] like Figure 4 As shown in the figure, when the ice-melting side line of phase C melts, the phase B line of the transformer operates with a missing phase.

[0066] The embodiment of the present invention provides a power grid layout structure based on the ice melting function, including a three-phase line on the non-ice melting side of the transformer and a three-phase line on the ice melting side of the transformer; the three-phase line on the ice melting side of the transformer is converted in turn, and two phases in the three-phase line are respectively connected in parallel in pairs, and the two parallel phases and the non-parallel phase form an operating loop to extend the ice melting distance of the line. The present invention not only extends the ice melting distance, but also improves the three-phase ice melting speed. The ice melting distance is positively correlated with the voltage applied by the transformer on the ice melting line. The ice melting effect is guaranteed for transmission and distribution lines of different voltage levels. It is simple and easy to operate, has low safety risks, a wide range of applications, and little environmental impact. It greatly saves the asset investment of power grid companies, and therefore has strong practicality.

[0067] Embodiment 2:

[0068] Reference Figure 5 As shown, a 10kv / 0.4kv distribution transformer is used as an ice-melting transformer, 0.4kv is the ice-melting voltage, the ice-melting conductor is LGJ-70, the conductor impedance is 0.587Ω / km, the distribution transformer capacity is 200KVA, three-phase direct short circuit full load ice melting, the ice-melting distance is 1.36km, and the principle is as follows Figure 8 shown.

[0069] The power grid arrangement system based on the ice melting function of the present invention includes the power grid arrangement structure based on the ice melting function as described above, and further includes:

[0070] The A-phase, B-phase and C-phase ice-melting lines of the transformer are switched in parallel to reduce the total impedance of the loop, so as to extend the ice-melting distance of the conductor by 1.33 times, from the original 1.36km to 1.8km. The principle is as follows: Figure 7 It should be noted that the ice melting distance is different for different conductor impedances, as shown in Table 1.

[0071] Table 1 Comparison of the de-icing distances of various conductors using a 200KVA distribution transformer as a de-icing transformer

[0072]

[0073]

[0074] In terms of ice melting speed, the three phases A, B, and C are switched in parallel in turn. For example, when melting phase A, the two phases BC in parallel are also melting at the same time. When melting phase B, the two phases AC in parallel are also melting at the same time, and so on. This ensures the symmetry of ice melting and effectively improves the ice melting speed on the basis of extending the ice melting distance. Therefore, the ice melting speed of the three phases is improved.

[0075] Figure 6 The diagrams of forward and reverse ice melting are shown. If the ice melting distribution transformer is powered by a ring network, there is a bidirectional power supply. Figure 5 The parallel conductor ice melting technology is also used. Taking the conductor as LGJ-70, it can melt 1.8km. Reverse ice melting means that the position of the ice melting transformer remains unchanged. Compared with forward ice melting, the high and low voltage sides of the ice melting transformer are reversed and connected to a reverse power supply for reverse ice melting. The ice melting effect and distance are the same as the forward direction. The superposition of forward and reverse directions can extend the ice melting distance by 2 times. The superposition of conductor parallel ice melting technology can extend the ice melting distance by 2.66 times. For details, please refer to Table 1.

[0076] The beneficial effects of the present invention are:

[0077] (1) Extended ice-melting distance: The present invention significantly extends the ice-melting distance of non-parallel phases by combining parallel and phase-loss operation, and ensures symmetrical ice-melting of the three phases by alternating conversion, thereby significantly improving the ice-melting effect.

[0078] (2) Improved ice melting speed: While the non-parallel phase of the present invention significantly improves the ice melting effect, the parallel phase circuit is actually also melting ice at the same time, thus saving ice melting time and improving the ice melting speed.

[0079] (3) Small workload and low safety risk: Compared with the prior art, the workload of the present invention is significantly reduced. The ice-melting operation can be performed by using the electric energy on the non-ice-melting side of the transformer and the wiring structure on the ice-melting side, which reduces the safety risk.

[0080] (4) Low investment and wide range of applications: The ice melting solution is simple and easy to implement, without the need to add too much additional power equipment. Compared with existing technologies, the investment is more economical, saving the fixed asset investment of power grid companies. In addition, it is applicable to both transmission lines and distribution lines, and has a very wide range of applications.

[0081] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0082] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0084] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A power grid layout structure based on ice melting function, characterized in that: It includes a three-phase circuit on the non-ice-melting side of a transformer and a three-phase circuit on the ice-melting side of the transformer; The three-phase circuit on the de-icing side of the transformer is converted alternately, and two phases in the three-phase circuit are connected in parallel in pairs, and the two parallel phases and the non-parallel phase form a running loop to achieve the effect of extending the de-icing distance and improving the de-icing speed; The three-phase circuit on the ice-melting side of the transformer includes an A-phase ice-melting side circuit, a B-phase ice-melting side circuit and a C-phase ice-melting side circuit, and the ice-melting process includes main ice-melting and auxiliary ice-melting; When the main ice melting is performed on the A-phase ice melting side circuit, the B-phase ice melting side circuit and the C-phase ice melting side circuit are connected in parallel to simultaneously perform the auxiliary ice melting; When the main ice melting is performed on the B-phase ice melting side line, the A-phase ice melting side line and the C-phase ice melting side line are connected in parallel to simultaneously perform the auxiliary ice melting; When the main ice melting is performed on the C-phase ice melting side line, the A-phase ice melting side line and the B-phase ice melting side line are connected in parallel to simultaneously perform the auxiliary ice melting; It also includes: when the A-phase ice-melting side line melts ice, the B-phase ice-melting side line of the transformer operates in a phase-lack mode; It also includes: when the B-phase ice-melting side line melts ice, the A-phase ice-melting side line of the transformer operates in a phase-lack mode; It also includes: when the C-phase ice-melting side line melts ice, the B-phase ice-melting side line of the transformer operates in a phase-lost state.

2. The power grid arrangement structure based on ice melting function according to claim 1 is characterized in that: The non-ice-melting-side three-phase circuit of the transformer includes an A-phase non-ice-melting-side circuit, a B-phase non-ice-melting-side circuit and a C-phase non-ice-melting-side circuit.

3. A power grid layout system based on ice melting function, characterized in that: The invention comprises a power grid arrangement structure based on ice melting function according to any one of claims 1 to 2, and further comprises: The A-phase ice-melting side line, the B-phase ice-melting side line and the C-phase ice-melting side line of the transformer perform ice-melting operations in turn.

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