CN219875070U - Neutral point grounding structure of 330kV transformer - Google Patents
Neutral point grounding structure of 330kV transformer Download PDFInfo
- Publication number
- CN219875070U CN219875070U CN202320387599.3U CN202320387599U CN219875070U CN 219875070 U CN219875070 U CN 219875070U CN 202320387599 U CN202320387599 U CN 202320387599U CN 219875070 U CN219875070 U CN 219875070U
- Authority
- CN
- China
- Prior art keywords
- transformer
- neutral point
- cable terminal
- phase reactor
- reactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007935 neutral effect Effects 0.000 title claims abstract description 78
- 238000002955 isolation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to the technical field of power equipment, in particular to a neutral point grounding structure of a 330kV transformer, which can solve the problems that when short-circuit current exceeds the set interruption capacity of equipment, the operation cost of a power grid is seriously increased when equipment which does not meet the short-circuit current requirement is replaced, and the safe operation of the power grid is endangered when equipment which does not meet the short-circuit current requirement is not replaced. The neutral point grounding structure of the 330kV transformer comprises: a transformer neutral bushing; the lightning arrester is electrically connected with the neutral point sleeve of the transformer, is grounded, and is also connected with an isolating switch between the lightning arrester and the neutral point sleeve of the transformer; the wire inlet end of the single-phase reactor is electrically connected with a neutral point sleeve of the transformer, and the single-phase reactor is grounded; when the isolation is closed, the neutral point sleeve of the transformer is grounded through the isolating switch and the lightning arrester; when the isolating switch is opened, the neutral point bushing of the transformer is grounded through the single-phase reactor.
Description
Technical Field
The utility model relates to the technical field of power equipment, in particular to a neutral point grounding structure of a 330kV transformer.
Background
At present, the safe running state of the power grid needs to consider the grounding mode of the neutral point of the power grid, and the grounding mode of the neutral point of the power grid is influenced by factors such as the voltage class of the power grid, single-phase grounding short-circuit current, overvoltage level, protection configuration and the like.
The neutral point of the 330kV main transformer running in the power grid structure adopts a direct grounding mode through a disconnecting switch, and as the connection of a power system becomes more and more dense, the exceeding of short-circuit current is increasingly evident. When the short-circuit current exceeds the set interruption capacity of the equipment, the investment of the operation cost of the power grid is seriously increased by replacing the equipment which does not meet the short-circuit current requirement, and the safe operation of the power grid is endangered by not replacing the equipment which does not meet the short-circuit current requirement.
Disclosure of Invention
In order to solve the problem that when the short-circuit current exceeds the set interruption capacity of equipment, the investment of the operation cost of a power grid is seriously increased when the equipment which does not meet the short-circuit current requirement is replaced, and the safe operation of the power grid is endangered when the equipment which does not meet the short-circuit current requirement is not replaced, the utility model provides a neutral point grounding structure of a 330kV transformer.
Embodiments of the present utility model are implemented as follows:
the embodiment of the utility model provides a neutral point grounding structure of a 330kV transformer, which comprises the following components:
the neutral point sleeve of the transformer is used for connecting a lightning arrester and a single-phase reactor;
the incoming line end of the lightning arrester is electrically connected with the neutral point bushing of the transformer, and the lightning arrester is grounded; an isolating switch is also connected between the lightning arrester and the neutral point bushing of the transformer;
the inlet wire end of the single-phase reactor is electrically connected with the neutral point bushing of the transformer, and the single-phase reactor is grounded;
when the isolation is closed, the neutral point bushing of the transformer is grounded through the isolating switch and the lightning arrester; when the isolating switch is opened, the neutral point bushing of the transformer is grounded through the single-phase reactor.
In some embodiments, the 330kV transformer neutral grounding structure further comprises:
the transformer side cable terminal is electrically connected with the transformer neutral point sleeve;
the reactor side cable terminal is electrically connected with the single-phase reactor;
and a power cable is further connected between the transformer side cable terminal and the reactor side cable terminal, and the transformer neutral point sleeve is grounded through the transformer side cable terminal, the power cable, the reactor side cable terminal and the single-phase reactor.
In some embodiments, the 330kV transformer neutral grounding structure further comprises:
the first bracket is provided with a side wall for fixing the transformer side cable terminal;
the bottom end of the first support is fixedly connected with the ground, and the transformer side cable terminal is fixedly connected with the side wall of the first support.
In some embodiments, the 330kV transformer neutral grounding structure further comprises:
a second bracket provided with a side wall for fixing the reactor-side cable terminal;
the bottom end of the second support is fixedly connected with the ground, and the reactor side cable terminal is fixedly connected with the side wall of the second support.
In some embodiments, the 330kV transformer neutral grounding structure further comprises:
the third bracket is provided with a side wall for fixing the single-phase reactor;
the bottom end of the third support is fixedly connected with the ground, and the single-phase reactor is fixedly connected with the side wall of the third support.
In some embodiments, the single-phase reactor is provided with a ground wire provided with an end for connecting to a main ground grid; an insulating support is further arranged between the grounding wire and the third support, one end of the insulating support is fixedly connected with the third support, and the other end of the insulating support is used for supporting the grounding wire.
The utility model has the beneficial effects that the neutral point bushing of the transformer is connected with the lightning arrester through the isolating switch in the closed state, so that the short-circuit current with smaller current is grounded; when the short-circuit current rises, the isolating switch is disconnected, and the transformer neutral point sleeve is grounded through the single-phase reactor, so that the grounded state of the transformer can be conveniently adjusted according to the requirement of the power system for limiting the single-phase short-circuit current, and the aim of improving the safe reliability of the power grid operation is fulfilled.
Drawings
Fig. 1 is a schematic structural diagram of a neutral point grounding structure of a 330kV transformer according to an embodiment of the utility model;
fig. 2 is a schematic structural diagram of a neutral point grounding structure of a 330kV transformer according to an embodiment of the utility model;
fig. 3 is a schematic diagram of a 330kV transformer neutral grounding structure for showing connection between a transformer neutral bushing and a transformer side cable terminal according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a neutral point grounding structure of a 330kV transformer for showing connection between a reactor-side cable terminal and a single-phase reactor according to an embodiment of the present utility model.
Reference numerals illustrate: 1. a transformer neutral bushing; 2. a lightning arrester; 3. a single-phase reactor; 31. a ground wire; 4. an isolating switch; 5. a transformer side cable terminal; 51. a first bracket; 6. a reactor-side cable terminal; 61. a second bracket; 7. a power cable; 8. a third bracket; 81. an insulating support.
Detailed Description
In order to facilitate the technical solution of the application, some concepts related to the present utility model will be described below first. The brief description of the terminology in the present utility model is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present utility model. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.
The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.
The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a neutral point grounding structure of a 330kV transformer according to an embodiment of the present utility model; fig. 2 is a schematic structural diagram of a neutral point grounding structure of a 330kV transformer according to an embodiment of the utility model.
The utility model provides a neutral point grounding structure of a 330kV transformer. The neutral point grounding structure of the 330kV transformer comprises: a transformer neutral point bushing 1, a lightning arrester 2 and a single-phase reactor 3. The neutral point sleeve 1 of the transformer is fixedly connected to the neutral grounding wire 31 end of the transformer, and the neutral point sleeve 1 of the transformer is electrically connected with the lightning arrester 2 and the single-phase reactor 3; the lightning arrester 2 is connected into a whole by being directly communicated with the main grounding grid; and an isolating switch 4 is also connected between the lightning arrester 2 and the neutral point bushing 1 of the transformer.
The input end of the single-phase reactor 3 and the neutral point bushing 1 of the transformer are also connected with a power cable 7, and the output end of the single-phase reactor 3 is electrically connected with a main grounding network.
When the single-phase short-circuit current of the power system rises, the isolating switch 4 is disconnected, and the transformer neutral point sleeve 1 is connected with the main grounding network into a whole through the single-phase reactor 3, so that the short-circuit with larger current is grounded through the unidirectional reactor, and the power system is protected; when the single-phase short-circuit current of the power system is reduced, the isolating switch 4 is closed, and the transformer neutral point sleeve 1 is connected with the main grounding network into a whole through the isolating switch 4 and the lightning arrester 2, so that the small short-circuit current is conveniently guided to the main grounding network through the lightning arrester 2, and the purpose of protecting the power system is realized.
The neutral point bushing 1 of the transformer is connected with the lightning arrester 2 through the isolating switch 4 in a closed state, so that the short-circuit current with smaller current is grounded; when the short-circuit current rises, the isolating switch 4 is disconnected, and the transformer neutral point sleeve is grounded through the single-phase reactor 3, so that the grounded state of the transformer can be conveniently adjusted according to the requirement of the power system for limiting the single-phase short-circuit current, and the aim of improving the safe reliability of the power grid operation is fulfilled.
In some embodiments, in order to facilitate adjusting the position of the single-phase reactor 3 according to actual field requirements, the 330kV transformer neutral grounding structure provided by the present utility model further includes a transformer side cable terminal 5 and a reactor side cable terminal 6, where the transformer side cable terminal 5 is electrically connected to the transformer neutral bushing 1 by a flexible wire connection manner; the reactor-side cable terminal 6 is electrically connected to the single-phase reactor 3.
A power cable 7 is further connected between the transformer side cable terminal 5 and the reactor side cable terminal 6, and the length of the power cable 7 is set according to the distance between the reactor side cable terminal 6 and the transformer side cable terminal 5 in an actual field. When the isolating switch 4 is disconnected, the transformer neutral point sleeve 1 is connected to the main grounding network through the transformer side cable terminal 5, the power cable 7, the reactor side cable terminal 6 and the single-phase reactor 3 to realize grounding, so that the purpose of protecting a power system is realized.
Referring to fig. 3, fig. 3 is a schematic diagram of a 330kV transformer neutral grounding structure for illustrating connection of a transformer neutral bushing to a transformer side cable terminal according to an embodiment of the present utility model.
In some embodiments, in order to facilitate adjusting the height of the transformer side cable terminal 5 according to the needs of the field, the installation position of the transformer side cable terminal 5 is provided with a first bracket 51, the first bracket 51 is perpendicular to the ground, and the bottom end of the first bracket 51 is connected with the ground into a whole by means of anchor bolts. The first bracket 51 is further provided with a side wall for fixing the transformer-side cable terminal 5, and the outer case of the transformer-side cable terminal is integrally connected with the first bracket 51 by means of bolting.
Referring to fig. 4, fig. 4 is a schematic diagram of a neutral point grounding structure of a 330kV transformer for showing connection of a reactor-side cable terminal to a single-phase reactor according to an embodiment of the present utility model.
In some embodiments, in order to further facilitate adjusting the height of the reactor-side cable terminal 6, the installation position of the reactor-side cable terminal 6 is also provided with a second bracket 61. The second bracket 61 is also arranged perpendicular to the ground, and the bottom end of the second bracket 61 is fixed on the ground in a foundation bolt connection mode. The second bracket 61 is provided with a side wall for supporting the reactor-side cable terminal 6; the reactor-side cable terminal 6 is connected to the second bracket 61 by bolting.
By arranging the first bracket 51, the installation height of the transformer side cable terminal 5 is convenient to adjust; by providing the second bracket 61, the installation height of the reactor-side cable terminal 6 is convenient to adjust; therefore, the installation requirements of the transformer side cable terminal 5 and the reactor side cable terminal 6 meet the design requirements, and the installation position of the reactor can be adjusted according to the field so as to improve the applicability of the neutral point grounding structure of the transformer.
In some embodiments, in order to facilitate adjustment of the installation height of the single-phase reactor 3, a third bracket 8 is disposed at the installation position of the single-phase reactor 3, the third bracket 8 is disposed perpendicular to the ground, the bottom end of the third bracket 8 is fixed on the ground by means of anchor bolt connection, and the bottom wall of the single-phase reactor 3 is integrally connected with the third bracket 8 by means of bolt fixation.
In some embodiments, the grounding connection of the single-phase reactor 3 is further provided with a grounding wire 31, the other end of the grounding wire 31 is connected with a main grounding network of the power system into a whole, and the grounding wire 31 is arranged along the height direction of the third bracket 8. An insulating support 81 is further arranged between the grounding wire 31 and the third support 8, one end of the insulating support 81 is fixedly connected with the third support 8 through bolts, and the other end of the insulating support 81 is used for supporting the grounding wire 31, so that the friction probability between the grounding wire 31 and the third support 8 is reduced.
The embodiment of the part has the beneficial effects that the neutral point bushing 1 of the transformer is connected with the lightning arrester 2 through the isolating switch 4 in the closed state, so that the short-circuit current with smaller current is grounded; when the short-circuit current rises, the isolating switch 4 is disconnected, and the transformer neutral point sleeve is grounded through the single-phase reactor 3, so that the grounded state of the transformer can be conveniently adjusted according to the requirement of the power system for limiting the single-phase short-circuit current, and the aim of improving the safe reliability of the power grid operation is fulfilled.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the above discussion in some examples is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (6)
1. A 330kV transformer neutral point grounding structure, characterized in that the 330kV transformer neutral point grounding structure comprises:
the transformer neutral point bushing (1) is used for connecting the lightning arrester (2) and the single-phase reactor (3);
a lightning arrester (2), wherein an inlet end of the lightning arrester is electrically connected with the neutral point bushing (1) of the transformer, and the lightning arrester (2) is grounded; an isolating switch (4) is also connected between the lightning arrester (2) and the neutral point sleeve (1) of the transformer;
a single-phase reactor (3) with an inlet end electrically connected with the transformer neutral point bushing (1), wherein the single-phase reactor (3) is grounded;
when the isolating switch (4) is closed, the neutral point bushing (1) of the transformer is grounded through the isolating switch (4) and the lightning arrester (2); when the isolating switch (4) is opened, the transformer neutral point bushing (1) is grounded through the single-phase reactor (3).
2. The 330kV transformer neutral point grounding structure of claim 1, wherein the 330kV transformer neutral point grounding structure further comprises:
a transformer side cable terminal (5) electrically connected with the transformer neutral point sleeve (1);
a reactor-side cable terminal (6) electrically connected to the single-phase reactor (3);
and a power cable (7) is further connected between the transformer side cable terminal (5) and the reactor side cable terminal (6), and the transformer neutral point sleeve (1) is grounded through the transformer side cable terminal (5), the power cable (7), the reactor side cable terminal (6) and the single-phase reactor (3).
3. The 330kV transformer neutral point grounding structure of claim 2, wherein the 330kV transformer neutral point grounding structure further comprises:
a first bracket (51) provided with a side wall for fixing the transformer side cable terminal (5);
the bottom end of the first support (51) is fixedly connected with the ground, and the transformer side cable terminal (5) is fixedly connected with the side wall of the first support (51).
4. The 330kV transformer neutral point grounding structure of claim 2, wherein the 330kV transformer neutral point grounding structure further comprises:
a second bracket (61) provided with a side wall for fixing the reactor-side cable terminal (6);
the bottom end of the second support (61) is fixedly connected with the ground, and the reactor side cable terminal (6) is fixedly connected with the side wall of the second support (61).
5. The 330kV transformer neutral point grounding structure of claim 1, wherein the 330kV transformer neutral point grounding structure further comprises:
a third bracket (8) provided with a side wall for fixing the single-phase reactor (3);
the bottom end of the third support (8) is fixedly connected with the ground, and the single-phase reactor (3) is fixedly connected with the side wall of the third support (8).
6. A neutral point grounding structure of a 330kV transformer according to claim 5, characterized in that the single-phase reactor (3) is provided with a grounding wire (31), the grounding wire (31) being provided with an end portion for connecting to a main grounding network; an insulating support (81) is further arranged between the grounding wire (31) and the third support (8), one end of the insulating support (81) is fixedly connected with the third support (8), and the other end of the insulating support (81) is used for supporting the grounding wire (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320387599.3U CN219875070U (en) | 2023-03-03 | 2023-03-03 | Neutral point grounding structure of 330kV transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320387599.3U CN219875070U (en) | 2023-03-03 | 2023-03-03 | Neutral point grounding structure of 330kV transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219875070U true CN219875070U (en) | 2023-10-20 |
Family
ID=88336673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320387599.3U Active CN219875070U (en) | 2023-03-03 | 2023-03-03 | Neutral point grounding structure of 330kV transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219875070U (en) |
-
2023
- 2023-03-03 CN CN202320387599.3U patent/CN219875070U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112217403B (en) | Extra-high voltage flexible direct current conversion unit arrangement structure with bridge arm reactor on direct current side | |
| EP3387454A1 (en) | Power transmission tower mounted series injection transformer | |
| US10396562B2 (en) | Series compensation device applicable to double-circuit line | |
| CN219875070U (en) | Neutral point grounding structure of 330kV transformer | |
| CN201937271U (en) | Compact type shunt capacitor complete device | |
| CN108808729B (en) | Circuit structure of electric main wiring of power plant | |
| US20230014710A1 (en) | Mounting bracket for bushing well interupter controls | |
| CN210957782U (en) | 35kV transformer substation sectional bus system based on mixed superconducting current limiter | |
| CN210006544U (en) | composite casing metal oxide lightning arrester | |
| CN102570482A (en) | High voltage parallel capacitor device based on neutral point direct grounding mode | |
| CN112688333A (en) | Design method for primary system of extra-high voltage transformer substation | |
| Ritonga et al. | Study Analysis Of Lightining Arrester Installation Location At Substations | |
| CN216436455U (en) | Voltage-sharing AC power distribution cabinet with lightning protection structure | |
| CN219892966U (en) | Electrical wiring system of reactive power compensation device of transformer substation | |
| US11962132B2 (en) | Support bracket for transformer switch utilizing existing transformer connection points | |
| CN210245292U (en) | Lightning-protection voltage transformer | |
| CN218243013U (en) | Circuit protector and frequency conversion circuit | |
| CN213093876U (en) | Outdoor box type dynamic reactive power compensation device | |
| CN217934247U (en) | Drainage fitting assembly with load bypass operation | |
| CN213637485U (en) | Thyristor transient protection device with reactor | |
| CN208508535U (en) | Integrated compact type high-voltage shunt reactor complexes | |
| CN211377974U (en) | Photovoltaic junction box with lightning protection function | |
| CN209881406U (en) | Improved transformer neutral point complete device | |
| CN2157586Y (en) | Line wave damper and coupling condenser integrated combination apparatus | |
| CN201118240Y (en) | Wind power generation high voltage dynamic filtering compensation apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |