Power distribution unit interval with main transformer and outgoing line functions and transformation obtaining method thereof

Abstract

The invention discloses a power distribution unit interval with main transformer and outgoing line functions and a transformation obtaining method thereof, and belongs to the field of transformer substation design and construction, and the method comprises the steps: carrying out the equipment dismounting of a 220kV open-type main transformer interval, planning the composition, size and installation positions of HGIS equipment, newly building a group of corresponding HGIS equipment at the two determined installation positions, and carrying out the construction of the HGIS equipment. And a tubular conductor is newly built between the two groups of newly built HGIS equipment, and wiring among the bus II, the bus I and the two groups of HGIS equipment is completed by means of the tubular conductor. According to the invention, the newly-generated interval can be added without additionally increasing the area of a power distribution device and adding an expropriated land, so that an old-built transformer substation effectively adapts to the current requirements, and the 220kV open-type transformer substation of which the outgoing line interval is completely occupied has the capability of accessing a new line again.

Description

Technical Field

[0001] The present invention relates to the field of substation design and construction, and in particular to a distribution device bay with main transformer and outgoing line functions and a method for obtaining its transformation. Background Art

[0002] The demand for new energy grid connection is gradually increasing, and more and more outgoing line bays of substations need to be connected, resulting in an increasingly tense situation of grid substation bay resources. At present, the structure of the 220kV open main transformer bay distribution device is as Figure 1 Figure 2 shown. Specifically, line-side frameworks and main-transformer-side frameworks are respectively arranged on both sides, and a cross-line running through the distribution device is supported on the top of the frameworks for main transformer incoming lines. On the right side of the line-side framework, a disconnector connected to the cross-line is arranged, on the right side of the disconnector, a current transformer and a circuit breaker are successively connected, on the right side of the circuit breaker, a II busbar and its busbar support are connected and arranged, on the right side of the II busbar, an I busbar and its busbar support are arranged, a disconnector is arranged between the II busbar and the I busbar, and an arrester is arranged below the main-transformer-side framework.

[0003] For the 220kV outdoor open substation with an earlier operation time, there are few remaining 220kV outgoing line bays in the station, and even all of them have been occupied, which cannot meet the demand for new outgoing lines. And the method of expanding the outgoing line bay by increasing the substation area faces the problems of complex land acquisition procedures and high costs. Therefore, how to transform the traditional early-built 220kV outdoor open substation so that it can be applicable to the current grid connection demand and increase the outgoing line bay has become an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a distribution device bay with main transformer and outgoing line functions and a method for obtaining its transformation. Without additionally increasing the area of the distribution device, the 220kV open main transformer bay is transformed into a distribution device bay with both main transformer and outgoing line functions by using HGIS equipment, which can not only have the original main transformer bay project but also meet the demand for new line access.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: A method for obtaining the transformation of a distribution device bay with main transformer and outgoing line functions, and the specific steps are as follows:

[0006] Step 1: Remove the equipment in the 220kV open main transformer bay, and only retain the frameworks on both sides, the cross-line running through the bay supported on the top of the frameworks, the II busbar, the I busbar and their respective busbar supports in the bay;

[0007] Step 2: Plan the composition and dimensions of the HGIS equipment; plan two groups of HGIS equipment, namely the main-transformer type HGIS equipment and the outgoing-line type HGIS equipment, and set the HGIS equipment to enable the original one bay position to have the functions of both main-transformer and outgoing-line bays without additional increase in the area of the distribution device.

[0008] Step 3: Determine two installation positions for the planned HGIS equipment that meet the electrical safety clearances within the removed bay.

[0009] Step 4: Newly build one corresponding group of HGIS equipment at each of the two determined installation positions.

[0010] Step 5: Newly build tubular conductors between the two newly built groups of HGIS equipment.

[0011] Step 6: Complete the wiring between the II busbar, the I busbar, and the two groups of HGIS equipment by means of the tubular conductors.

[0012] A further improvement of the technical solution of the present invention is that: the equipment to be specifically removed in Step 1 is the disconnector, current transformer, circuit breaker, main-transformer side lightning arrester, and the installation bases of each equipment.

[0013] A further improvement of the technical solution of the present invention is that: the outgoing-line type HGIS equipment in Step 2 includes the outermost outgoing-line bushing installed vertically, the I bushing, the innermost II bushing, and the built-in circuit breaker, disconnector, current transformer, voltage transformer. The outgoing-line type HGIS equipment adopts an open-type lightning arrester, and the lightning arrester is arranged outside the framework. The main-transformer type HGIS equipment includes the outermost main-transformer bushing installed vertically, the I bushing, the innermost II bushing, and the built-in circuit breaker, disconnector, current transformer, lightning arrester.

[0014] A further improvement of the technical solution of the present invention is that: in Step 3, the installation positions of the outgoing-line bushing and the main-transformer bushing respectively do not exceed the center lines of the two-side frameworks. The installation position of the outgoing-line type HGIS equipment is set on the left side below the II busbar, and the installation position of the main-transformer type HGIS equipment is set below the I busbar.

[0015] A further improvement of the technical solution of the present invention is that: in Step 5, the tubular conductors are horizontally arranged below the II busbar, between the outgoing-line type HGIS equipment and the main-transformer type HGIS equipment. Multiple post insulators are arranged below the tubular conductors to support the tubular conductors in the air.

[0016] The further improvement of the technical solution of the present invention lies in: in step 6, the II busbar is connected to the tubular conductor, and both ends of the tubular conductor are respectively connected to the II busbar bushing inside the outgoing line type HGIS device and the II busbar bushing inside the main transformation type HGIS device. The I busbar bushing of the outgoing line type HGIS device is connected to the I busbar through an overhead line above, and the I busbar bushing of the main transformation type HGIS device is directly connected to the I busbar through a downlead; the line led out from the outgoing line bushing of the outgoing line type HGIS device is connected to the external line through a jumper, and the line led out from the main transformer bushing of the main transformation type HGIS device is connected to the main transformer through a jumper.

[0017] A distribution device bay with main transformer and outgoing line functions is obtained according to the transformation acquisition method.

[0018] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: by using the HGIS device to transform the 220kV open main transformer bay into a distribution device bay with both main transformer and outgoing line functions, it is not necessary to additionally increase the area of the distribution device, and there is no need to newly acquire land. A new outgoing line bay can be added, enabling the old-built substation to effectively adapt to the current requirements, enabling the 220kV open substation with the outgoing line bay completely occupied to regain the ability to access new lines, which is of great significance for the collection and consumption of new energy. The transformation of the old substation can not only greatly reduce the construction cost and eliminate the impact of land acquisition for construction, but also enable one bay to have the functions of accessing the main transformer and the line at the same time, realizing the effective utilization of the bay space. The functions of the main transformer and outgoing line bays are integrated in one bay space, reducing the space requirement by half, effectively saving the project cost of a single bay. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 Current sectional layout diagram of the 220kV open main transformer bay distribution device;

[0021] Figure 2 Current plan layout diagram of the 220kV open main transformer bay distribution device; A<--

[0022] Figure 3 Sectional layout diagram of the distribution device bay with main transformer and outgoing line functions after transformation;

[0023] Figure 4 Plan layout diagram of the distribution device bay with main transformer and outgoing line functions after transformation; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described in detail below in conjunction with embodiments:

[0025] As Figure 3 Figure 4 shown, it is a schematic structural diagram of a distribution device interval with main transformer and outgoing line functions obtained after the transformation of the current 220 kV open main transformer interval distribution device. The specific steps for the transformation acquisition method are as follows:

[0026] Step 1: Remove the equipment in the 220 kV open main transformer interval. Only the two-side frameworks (i.e., the line-side framework and the main transformer-side framework) and the cross-line running through the interval, II busbar, I busbar, and their respective busbar supports set at the top of the frameworks are retained in the interval. The specific equipment to be removed is the disconnector, current transformer, circuit breaker, main transformer-side lightning arrester, and the installation bases of each equipment.

[0027] Step 2: Plan the composition and dimensions of the HGIS equipment; the two groups of HGIS equipment are the main transformer type HGIS equipment and the outgoing line type HGIS equipment respectively; on the premise of not additionally increasing the area of the distribution device, the outgoing line type HGIS equipment includes the outermost outgoing line bushing installed vertically, the I busbar bushing installed vertically, the II busbar bushing installed vertically at the innermost side, and complete outgoing line interval functional units such as the built-in circuit breaker, disconnector, current transformer, voltage transformer, etc. The outgoing line type HGIS equipment uses an open lightning arrester, and the lightning arrester is set outside the framework. The main transformer type HGIS equipment includes the outermost main transformer bushing installed vertically, the I busbar bushing installed vertically, the II busbar bushing installed vertically at the innermost side, and complete main transformer interval functional units such as the built-in circuit breaker, disconnector, current transformer, lightning arrester, etc. The live working distance of the newly added equipment meets the requirements of the "Design Code for High-Voltage Distribution Devices DL / T 5352-2018", and the newly added equipment has complete main transformer and outgoing line functions.

[0028] Step 3: Determine and plan 2 installation positions for the HGIS equipment that meet the electrical safety clearance in the interval after removal; the installation positions of the outgoing line bushing and the main transformer bushing do not exceed the center lines of the two-side frameworks. The installation position of the outgoing line type HGIS equipment is set on the left side below the II busbar, and the installation position of the main transformer type HGIS equipment is set below the I busbar. The live working distance of the newly added equipment meets the requirements of the "Design Code for High-Voltage Distribution Devices DL / T 5352-2018".

[0029] Step 4: Newly build a corresponding set of HGIS equipment at each of the two determined installation positions; that is, newly build and install a line-type HGIS equipment on the left side below the II busbar. The position of the outgoing bushing at the leftmost side of the line-type HGIS equipment does not exceed the center line of the line-side structure. The line-type HGIS equipment uses an open-type lightning arrester, and the lightning arrester is installed outside the line-side structure. Newly build and install a main-transformer-type HGIS equipment below the I busbar. The position of the main transformer bushing at the rightmost side of the main-transformer-type HGIS equipment does not exceed the center line of the main-transformer-side structure.

[0030] Step 5: Newly build a tubular conductor between the two newly built sets of HGIS equipment; that is, the tubular conductor is horizontally arranged below the II busbar, between the line-type HGIS equipment and the main-transformer-type HGIS equipment. Multiple post insulators are arranged below the tubular conductor to support the tubular conductor in the air.

[0031] Step 6: Complete the wiring between the II busbar, the I busbar, and the two sets of HGIS equipment with the help of the tubular conductor. The II busbar is connected to the tubular conductor. Both ends of the tubular conductor are respectively connected to the II busbar bushings inside the line-type HGIS equipment and the II busbar bushings inside the main-transformer-type HGIS equipment. The I busbar bushing of the line-type HGIS equipment is connected to the I busbar through an overhead line above. The I busbar bushing of the main-transformer-type HGIS equipment is directly connected to the I busbar through a downlead. The line led out from the outgoing bushing of the line-type HGIS equipment is connected to the external line through a jumper wire. The line led out from the main transformer bushing of the main-transformer-type HGIS equipment is connected to the main transformer through a jumper wire. Thus, the transformation and creation of a distribution device bay with main transformer and outgoing line functions are completed. The transformed distribution device bay with main transformer and outgoing line functions is as Figure 3 Figure 4 shown. The present invention is applicable to the design, construction, and transformation of 220 kV outdoor open-type distribution devices, and is particularly applicable to the transformation of 220 kV outdoor open-type substations that need to add an outgoing line bay but have a tight position for the outgoing line bay and cannot acquire new land.

[0032] The embodiments described above are only for describing the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions, characterized by: The specific steps are as follows: Step 1: Dismantle the equipment in the 220kV open main transformer bay, leaving only the spans on both sides and the top support of the bay, busbar II, busbar I, and their respective busbar supports; Step 2: Plan the HGIS equipment composition and size. Plan two groups of HGIS equipment: a main transformer type HGIS and an outgoing line type HGIS. The HGIS equipment should be configured to allow the existing bay to function as both a main transformer and an outgoing line bay without increasing the area of the power distribution equipment. Step 3: Determine and plan two HGIS equipment installation locations that meet electrical safety clearance requirements within the interval after demolition; Step 4: Create a new set of corresponding HGIS equipment at each of the two determined installation locations; Step 5: Build a new tubular conductor between the two newly built HGIS equipment groups; Step 6: Use tubular conductors to complete the wiring between busbar II, busbar I, and two groups of HGIS equipment.

2. A method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions according to claim 1, characterized in that: The specific equipment to be removed in step 1 is the disconnector, current transformer, circuit breaker, main transformer-side lightning arrester, and the installation foundation of each equipment.

3. The method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions according to claim 1 is characterized in that: The outgoing line type HGIS equipment in step 2 includes the vertically installed outermost outgoing line bushing, I mother bushing, the innermost II mother bushing, and the built-in circuit breaker, disconnector, current transformer, and voltage transformer. The outgoing line type HGIS equipment uses an open lightning arrester, which is installed on the outside of the structure. The main transformer type HGIS equipment includes the vertically installed outermost main transformer bushing, I mother bushing, the innermost II mother bushing, and the built-in circuit breaker, disconnector, current transformer, and lightning arrester.

4. The method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions according to claim 1 is characterized in that: In step 3, the installation positions of the outgoing line bushing and the main transformer bushing shall not exceed the center line of the structures on both sides. The installation position of the outgoing line type HGIS equipment shall be set to the left below the II busbar, and the installation position of the main transformer type HGIS equipment shall be set to the bottom of the I busbar.

5. The method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions according to claim 3 is characterized in that: In step 5, the tubular conductor is horizontally arranged below the II busbar, between the outgoing line type HGIS equipment and the main transformer type HGIS equipment. Multiple support insulators are arranged below the tubular conductor to support the tubular conductor in mid-air.

6. A method for obtaining interval reconstruction of a power distribution device with main transformer and outgoing line functions according to claim 5, characterized in that: In step 6, busbar II is connected to the tubular conductor, and the two ends of the tubular conductor are respectively connected to the female bushing II on the inside of the outgoing-type HGIS equipment and the female bushing II on the inside of the main transformer-type HGIS equipment. The busbar bushing I of the outgoing-type HGIS equipment is connected to busbar I through the upper crossover wire, and the busbar bushing I of the main transformer-type HGIS equipment is directly connected to busbar I through the down conductor; the lead-out line in the outgoing bushing of the outgoing-type HGIS equipment is connected to the external line through a jumper, and the lead-out line in the main transformer bushing of the main transformer-type HGIS equipment is connected to the main transformer through a jumper.

7. A power distribution device bay with main transformer and outgoing line functions, characterized by: Obtained according to the transformation and acquisition method described in any one of claims 1 to 6.

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