CN220874111U - Improved complete device for 220KV main transformer neutral point - Google Patents
Improved complete device for 220KV main transformer neutral point Download PDFInfo
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- CN220874111U CN220874111U CN202322617246.0U CN202322617246U CN220874111U CN 220874111 U CN220874111 U CN 220874111U CN 202322617246 U CN202322617246 U CN 202322617246U CN 220874111 U CN220874111 U CN 220874111U
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- equipment support
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- knife
- neutral point
- switch
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
The utility model provides an improved generation complete set device for 220KV main transformer neutral point, including isolator, earthing switch, arrester, clearance protection, zero sequence current transformer, master knife operating device, earth knife operating device, equipment support, isolator and earthing switch make up to single earthing switch, still include the equipment support, single earthing isolator has master knife, earth knife and wiring board, single earthing switch, arrester, clearance protection and zero sequence current transformer all are on the equipment support, the opening orientation of master knife and earth knife is different, the equipment support adopts "pi" type equipment support or single equipment support, adopt the one-tenth of a row to arrange on the "pi" type equipment support, single equipment support adopts "worker" style of calligraphy to arrange. The isolating switch and the grounding switch are combined into the single-grounding isolating switch, the same electric principle is adopted for wiring, the first structure adopts one-row arrangement, the second structure adopts I-shaped arrangement, and the proper appearance can be selected according to the actual conditions such as the size of a field.
Description
Technical Field
The utility model relates to a main transformer neutral point complete device, in particular to a complete device for a 220KV main transformer neutral point.
Background
The transformer is used as the most important equipment in a transformer substation, and in order to ensure the safe operation in a system, reduce equipment cost and the like, a direct grounding mode is generally adopted for a high-voltage side neutral point of the existing 220kV transformer. When the system single-phase short-circuit current is too large, the grounding quantity of the neutral point of the transformer can be reduced to improve. Typically, the neutral point of 1 or 2 main transformers in a substation is directly grounded. In consideration of the fact that when the neutral point is grounded, main transformer fault overhauling and exiting operation is carried out, other main transformer neutral points are required to be changed into a direct grounding mode, so that in order to facilitate flexible switching of each main transformer neutral point between direct grounding and ungrounded, a grounding switch is arranged at each main transformer high-voltage side neutral point in the 220kV transformer substation. In addition, in order to protect the neutral point insulation of the transformer, a lightning arrester and a gap protection are simultaneously configured. Therefore, the grounding switch, the lightning arrester, the gap protection and the zero sequence current transformer are fixedly matched to form the 220kV main transformer neutral point complete equipment.
On the other hand, with the rapid development of dc power transmission, it has become more serious and frequent to cause dc bias problems of grounding transformers in ac systems. The direct current magnetic bias of the transformer can cause the problems of harmonic wave, noise, overheat and the like of the main transformer, and the damage of the transformer and the capacitor can be caused when the magnetic bias is serious, and the misoperation of protection can be caused, so that the safe operation of the transformer and the capacitor bank, even a power grid, is influenced. In order to inhibit the DC magnetic bias problem of the transformer, a DC blocking device is required to be additionally arranged at the neutral point of the grounding transformer of the transformer substation.
When the 220kV transformer substation needs to be additionally provided with the direct-current blocking device, equipment of the main transformer neutral point is additionally provided with the neutral point complete equipment. In order to save the occupied land, the main transformers of the 220kV transformer substation are generally arranged in a row, different main transformers are isolated by a firewall, the neutral point complete equipment is arranged near the neutral point sleeve of the main transformer, and the main transformer is installed by a single bracket and connected by an overhead flexible conductor. The blocking device is difficult to arrange nearby around the main transformer, particularly an indoor transformer substation, and is often arranged at the empty place of the transformer substation and far away from the neutral point of the main transformer due to large occupied area, and the blocking device is connected by cables. In order to avoid the need of stopping the operation of the main transformer during the maintenance of the cable, an isolating switch is needed to be additionally arranged between the cable and the neutral point sleeve of the main transformer.
The neutral point complete equipment and the isolating switch are arranged near the main transformer neutral point sleeve at the same time, two independent equipment supports are required to be arranged, factors such as equipment electrification distance, smoothness in wiring and the like are required to be comprehensively considered, and the problems that wiring is complex, the supports are more, even the installation position is difficult to find and the like exist.
Disclosure of utility model
The utility model aims to overcome the defects of complex wiring, more brackets and difficult finding of installation positions in the prior art, and provides an improved complete device for a 220KV main transformer neutral point, which has the advantages of simple structure wiring, small occupied area, low manufacturing cost and high installation efficiency.
The utility model solves the technical problems of the prior art by adopting the technical scheme that the improved complete set of device for the 220KV main transformer neutral point comprises a disconnecting switch, a grounding switch, a lightning arrester, a gap protection device, a zero sequence current transformer, a main knife operating mechanism box, a ground knife operating mechanism box and a device bracket, wherein the disconnecting switch and the grounding switch are combined into a single grounding switch, the device bracket also comprises the single grounding disconnecting switch which is provided with a main knife, a ground knife and a wiring board, the single grounding switch, the lightning arrester, the gap protection device and the zero sequence current transformer are all arranged on the device bracket, the opening orientations of the main knife and the ground knife are different, the device bracket adopts a pi-shaped device bracket or a single device bracket, the pi-shaped device bracket adopts a line-shaped arrangement, and the single device bracket adopts an I-shaped arrangement.
Further, the equipment support is a 'pi' -shaped equipment support, the single grounding isolating switch, the lightning arrester, the gap protection and the zero sequence current transformer are arranged on the 'pi' -shaped equipment support in a row, wherein the single grounding isolating switch adopts a double-column horizontal opening type, the opening of the main knife faces to the rear side, the ground knife is positioned on the right side, one side of the wiring board is connected with a cable, the other side of the wiring board is electrically connected with a main transformer neutral point and connected to the lightning arrester, and the main knife operating mechanism box and the ground knife operating mechanism box are arranged on two sides of a supporting leg of the 'pi' -shaped equipment support.
Further, the equipment support is a single equipment support, the top of the single equipment support is welded into an I-shaped fixing frame through channel steel, the single grounding isolating switch is arranged at the front end of the I-shaped fixing frame, the main cutter opening faces to the front side, the ground cutter is positioned on the right side, the main cutter operating mechanism box is arranged on the front side of the equipment support, and the ground cutter operating mechanism box is arranged on the right front side of the equipment support; the lightning arrester, the gap protection and the zero sequence current transformer are arranged on the rear side of the I-shaped fixing frame.
Further, the single equipment support is installed eccentrically and is close to one side of the single grounding isolating switch.
The utility model has the following beneficial technical effects:
The isolating switch and the grounding switch are combined into a single grounding isolating switch, the same electric principle is adopted for wiring, the first structure adopts a one-row arrangement, the second structure adopts an I-shaped arrangement, and the proper appearance can be selected according to the actual conditions of the field size and the like. The improved complete device of the utility model can simplify wiring, save occupied area, reduce equipment cost, and reduce installation time and engineering quantity.
Drawings
FIG. 1 is a schematic diagram of an electrical wiring diagram incorporating a disconnector and grounding switch of an embodiment 1 of the improved kit for a 220KV main transformer neutral point of the present utility model;
FIG. 2 is a front view of the construction of an embodiment 1 of the improved kit for a 220KV main transformer neutral point of the present utility model;
FIG. 3 is a top plan view of a second embodiment of the improved kit of the present utility model for a 220KV main transformer neutral point;
FIG. 4 is a structural elevation view of embodiment 2 of the improved kit for a 220KV main transformer neutral point of the present utility model;
FIG. 5 is a right side view of the construction of embodiment 2 of the improved kit for a 220KV main transformer neutral point of the present utility model;
Fig. 6 is a second rear view of the construction of embodiment 2 of the improved kit for a 220KV main transformer neutral point of the present utility model.
Reference numerals illustrate:
1. A single-grounded isolation switch; 2. a lightning arrester; 3. gap protection; 4. a zero sequence current transformer; 5. a main knife operating mechanism box; 6. a ground knife operating mechanism box; 7. an equipment rack; 8. a main cutter; 9. a ground knife; 10. a wiring board; 11. i-shaped fixing frame.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 2 and 3, the present embodiment includes a disconnecting switch and a grounding switch, a lightning arrester 2, a gap protection 3, a zero sequence current transformer 4, a main knife operating mechanism box 5, a ground knife operating mechanism box 6, and an equipment bracket 7, the disconnecting switch and the grounding switch form a single grounding disconnecting switch 1, the lightning arrester 2, the gap protection 3, the zero sequence current transformer 4, the main knife operating mechanism box 5 and the ground knife operating mechanism box 6 are all installed on the equipment bracket 7, and the single grounding disconnecting switch 1 has a main knife 8, a ground knife 9 and a wiring board 10.
The equipment support 7 adopts a 'pi' -shaped equipment support 7, a single grounding isolating switch 1, a lightning arrester 2, a gap protection 3 and a zero sequence current transformer 4 are arranged on the equipment support 7 in a row from left to right, wherein the single grounding isolating switch 1 adopts a double-column horizontal opening type, an opening of a main knife 8 faces to the rear side, a grounding knife 9 is positioned on the right side of the single grounding isolating switch 1, a cable is connected to the left side of a wiring board 10, the right side of the wiring board 10 is electrically connected with a main transformer neutral point and connected to the lightning arrester 2 in parallel, and a main knife operating mechanism box 5 and a grounding knife operating mechanism box 6 are arranged on two sides of a left side supporting leg of the 'pi' -shaped equipment support 7.
Example 2
Referring to fig. 4, 5 and 6, the equipment support 7 is a single equipment support, the top of the single equipment support is welded into an i-shaped fixing frame 11 by using channel steel, the single grounding isolating switch 1 is arranged at the front end of the i-shaped fixing frame 11, namely, the lower transverse of the i-shaped fixing frame is arranged left and right, the opening of the main knife 8 faces to the front side, the ground knife 9 is positioned on the right side, the main knife operating mechanism box 5 is arranged at the front side of the equipment support 7, the ground knife operating mechanism box 6 is arranged at the right front side of the equipment support 7, and the ground knife 9 is directly below. The lightning arrester 2 and the zero sequence current transformer 4 are arranged on the rear side of the I-shaped fixing frame 11, namely the upper cross of the I-shaped fixing frame, the lightning arrester 2 is positioned on the right rear side, the zero sequence current transformer 4 is positioned on the left rear side, and the gap protection 3 is positioned between the two.
In addition, the equipment support 7 is installed eccentrically and is close to one side of the single-grounding isolating switch 1.
The foregoing are preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component. Therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (4)
1. The utility model provides an improved generation complete set device for 220KV main transformer neutral point, includes isolator, earthing switch, arrester (2), clearance protection (3), zero sequence current transformer (4), main sword operating device case (5), earthing switch operating device case (6) and equipment support (7), isolator with earthing switch combination is single earthing isolator (1), its characterized in that still includes equipment support (7), single earthing isolator (1) have main sword (8), earthing sword (9) and wiring board (10), single earthing isolator (1) arrester (2), clearance protection (3) and zero sequence current transformer (4) are all in on equipment support (7), just main sword (8) with the opening orientation of earthing switch (9) is different, equipment support (7) adopt "pi" type equipment support or single equipment support, adopt one-tenth style of calligraphy to arrange on the "pi" type equipment support, single equipment support adopts "worker" style of calligraphy to arrange.
2. An improved complete device for 220KV main transformer neutral point according to claim 1, characterized in that the equipment support (7) is a n-type equipment support, the single grounding disconnecting switch (1), the lightning arrester (2), the gap protection (3) and the zero sequence current transformer (4) are arranged on the n-type equipment support in a row, wherein the single grounding disconnecting switch (1) adopts a double-column horizontal opening type, the opening of the main knife (8) faces to the rear side, the ground knife (9) is positioned on the right side, one side of the wiring board (10) is connected with a cable, the other side of the wiring board is electrically connected with the main transformer neutral point and connected to the lightning arrester (2), and the main knife operating mechanism box (5) and the ground knife operating mechanism box (6) are arranged on two sides of a supporting leg of the n-type equipment support.
3. The improved complete device for the 220KV main transformer neutral point according to claim 1, wherein the equipment support (7) is a single equipment support, the top of the single equipment support is welded into an I-shaped fixing frame (11) through channel steel, the single grounding isolating switch (1) is installed at the front end of the I-shaped fixing frame (11), an opening of the main knife (8) faces to the front side, the ground knife (9) is located on the right side, the main knife operating mechanism box (5) is installed on the front side of the equipment support (7), and the ground knife operating mechanism box (6) is installed on the right front side of the equipment support (7); the lightning arrester (2), the gap protection (3) and the zero sequence current transformer (4) are arranged on the rear side of the I-shaped fixing frame (11).
4. An improved kit for a 220KV main transformer neutral point according to claim 3, characterized in that a single equipment support is mounted eccentrically, close to one side of the single earthing disconnector (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322617246.0U CN220874111U (en) | 2023-09-26 | 2023-09-26 | Improved complete device for 220KV main transformer neutral point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322617246.0U CN220874111U (en) | 2023-09-26 | 2023-09-26 | Improved complete device for 220KV main transformer neutral point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220874111U true CN220874111U (en) | 2024-04-30 |
Family
ID=90816534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322617246.0U Active CN220874111U (en) | 2023-09-26 | 2023-09-26 | Improved complete device for 220KV main transformer neutral point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220874111U (en) |
-
2023
- 2023-09-26 CN CN202322617246.0U patent/CN220874111U/en active Active
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