CN223297340U

CN223297340U - A fully insulated incoming line structure for a step-up substation

Info

Publication number: CN223297340U
Application number: CN202422274046.4U
Authority: CN
Inventors: 陈晓凌; 钟鸣; 王文科
Original assignee: Jiangsu Anjiao Intelligent Electric Co ltd
Current assignee: Jiangsu Anjiao Intelligent Electric Co ltd
Priority date: 2024-09-18
Filing date: 2024-09-18
Publication date: 2025-09-02
Anticipated expiration: 2034-09-18

Abstract

The utility model discloses a fully insulated incoming line structure for a step-up substation, belonging to the technical field of high-voltage equipment. The structure is suitable for use in substations that boost 35kV or 66kV current to 110kV or 220kV. The structure comprises a low-voltage section, wherein the current in the low-voltage section flows through power generation equipment into a first switch distribution cabinet, a GIL input line, a first gas-insulated metal-enclosed switch, a GIL input line, and ultimately into a step-up transformer. A high-voltage section, wherein the current in the high-voltage section, after being boosted by the step-up transformer, passes sequentially through a GIL output line, a second gas-insulated metal-enclosed switch, and a GIL output line into a second switch distribution cabinet, ultimately flowing into the power grid. The insulating gas in the line is SF6. The utility model provides a fully insulated incoming line structure for a step-up substation. Compared with conventional substation incoming line methods, the structure has lower requirements for equipment insulation distance, can reduce equipment dimensions and floor space, and has no exposed live parts in the incoming line structure, which is less affected by external factors and is safer.

Description

Full-insulation incoming line structure of boost substation

Technical Field

The utility model relates to the technical field of high-voltage equipment, in particular to an all-insulation incoming line structure of a boost substation.

Background

At present, most of the incoming line modes of the transformer substation adopt overhead line incoming lines, part of the incoming lines of the step-down transformer substation adopt a fully-insulated structure of GIS (gas insulated metal enclosed switchgear) and transformer direct connection, and the step-up transformer substation still adopts the overhead line and isolation knife structure.

For the boost substation adopting overhead line incoming line at present, the following problems still exist to solve when in actual application:

1) The incoming line of the overhead line of the boost substation is easily influenced by external environmental factors such as humidity, altitude and the like, and the incoming line is exposed during operation, so that a safety distance is required to be kept according to the rule requirement of corresponding voltage class, and a large occupied space is generally required to occupy in order to ensure the safety of the insulation distance, thereby wasting a large amount of resources.

2) It is difficult to connect the pressurization experiment tool to perform the pressurization experiment.

3) Meanwhile, the power station incoming line has more charged bodies, the boosting transformer station adopting the overhead line incoming line is low in safety, and safety accidents are easy to generate.

Disclosure of utility model

The utility model provides a full-insulation incoming line structure of a boost transformer substation, which aims to solve the problems in the background art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a full-insulation incoming line structure of a boost substation, which comprises,

The low-voltage section, the current in the low-voltage section flows into the first switch power distribution cabinet, the GIL input line, the first gas insulated metal-enclosed switch and the GIL input line through the power generation equipment, and finally enters the step-up transformer;

And after the current in the high-voltage section is boosted by the step-up transformer, the current sequentially enters a second switch power distribution cabinet through the GIL output line, the second gas-insulated metal-enclosed switch and the GIL output line, and finally flows into a power grid.

Preferably, the voltage in the low-voltage section is 35kV, and the voltage in the high-voltage section is 110kV or 220kV.

Preferably, the insulating gas in the GIL input line and the GIL output line is SF6.

Preferably, the first gas-insulated metal-enclosed switchgear and the second gas-insulated metal-enclosed switchgear each comprise a circuit breaker, a grounding switch and a voltage transformer, wherein,

The circuit breaker is used for opening and closing a circuit;

the grounding switch is used for equipment overhaul;

The voltage transformer is used for equipment monitoring.

Preferably, the GIL input line and the GIL output line are both connected with the step-up transformer through three-station isolating switches.

Preferably, plug-in cable heads are arranged on the GIL input line and the GIL output line.

Further preferably, the plug-in cable heads on the GIL input line and the plug-in cable heads on the GIL output line are respectively provided with three phase interfaces corresponding to the first gas insulated metal enclosed switch and the second gas insulated metal enclosed switch respectively.

Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:

the utility model provides an all-insulation incoming line structure of a boost substation, which has the following advantages:

1) According to the application, insulating medium in the booster substation inlet line adopts insulating gas such as sulfur hexafluoride, so that the requirement on the insulating distance of equipment is small, and the external dimension and occupied space of the equipment can be reduced.

2) The whole line of the line inlet structure of the boosting transformer substation is free of naked charged bodies, is less influenced by external factors, and is safer.

3) Three-phase plug-in type cable heads are arranged on the GIL input line and the GIL output line and correspond to the circuit breakers of the first gas-insulated metal-enclosed switch and the second gas-insulated metal-enclosed switch respectively, and the grounding switch and the voltage transformer are connected with the test tools to carry out pressurization tests on each item of the first gas-insulated metal-enclosed switch and the second gas-insulated metal-enclosed switch at corresponding positions through switching on and off the three-station isolating switch, the first gas-insulated metal-enclosed switch and the second gas-insulated metal-enclosed switch, so that the line safety is ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic elevational view of the present utility model;

Fig. 2 is a schematic top view of the present utility model.

The figure shows that 1, a first switch power distribution cabinet; 2, GIL input lines, 3, plug-in cable heads, 4, a first gas insulated metal closed switch, 5, a three-station isolating switch, 6, a step-up transformer, 7, GIL output lines, 8, a second gas insulated metal closed switch and 9, a second switch power distribution cabinet.

Detailed Description

For a better understanding of the objects, structures and functions of the present utility model, the technical solution of the present utility model will be described in further detail with reference to the drawings and the specific preferred embodiments.

In the description of the present utility model, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present utility model. The specific dimensions used in the examples are for illustration of the technical solution only and do not limit the scope of protection of the utility model. It will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Unless specifically stated or limited otherwise, the terms "mounted," "configured," "connected," "secured" and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1:

Referring to fig. 1-2, the application provides a full-insulation incoming line structure of a boost substation, which comprises a first switch power distribution cabinet 1, a GIL input line 2, a first gas-insulated metal-enclosed switch 4, the GIL input line 2 and a low-voltage incoming line section formed by a boost transformer 6, wherein 35kV low voltage is converged through the first switch power distribution cabinet 1 and is boosted through connection of the GIL input line 2 and the boost transformer 6, the first gas-insulated metal-enclosed switch 4 is arranged midway of the GIL input line 2, the first gas-insulated metal-enclosed switch 4 comprises a circuit breaker, a grounding switch and a voltage transformer, the circuit breaker is used for switching on and off the line, the grounding switch is used for equipment maintenance, and the voltage transformer is used for equipment monitoring.

After the current is boosted by the step-up transformer 6, the current sequentially enters a second switch power distribution cabinet 9 from the other side of the step-up transformer 6 through a GIL output line 7, a second gas-insulated metal-enclosed switch 8 and the GIL output line 7, finally flows into a power grid and is conveyed to electric equipment, the second gas-insulated metal-enclosed switch 8 comprises a circuit breaker, a grounding switch and a voltage transformer, the circuit breaker is used for switching on and off the line, the grounding switch is used for equipment maintenance, the voltage transformer is used for equipment monitoring, and the boosted voltage is 110kV or 220kV and is suitable for being used for construction of an underground transformer substation or an urban transformer substation.

Compared with the traditional step-up transformer substation, the step-up transformer substation has the advantages that the line inlet and outlet structures are all conveyed by GIL (gas insulated metal enclosed transmission line), the safety distance between the lines is smaller than that of the existing naked line inlet transformer substation, the overall dimension and occupied space of equipment can be reduced, meanwhile, naked charged bodies are not needed, the influence of external factors is small, and the step-up transformer substation is safer.

Further, the insulating gas in the GIL input line 2 and GIL output line 7 is SF6.

Further, the GIL input line 2 and the GIL output line 7 are connected with the step-up transformer 6 through the three-position isolating switch 5, the three-position isolating switch 5 is provided with a closing position, a separating position and a grounding position, the three-position isolating switch 5 is only provided with a single knife, the single knife represents different states at different positions, the traditional isolating switch is a double knife and comprises a main knife and a ground knife, the possibility of misoperation exists, and the three-position isolating switch 5 is controlled by adopting the single knife to match with the current electric lock, so that the possibility of misoperation can be avoided.

Example 2:

on the basis of the above embodiment, as shown in fig. 1, plug-in cable heads 3 are provided on both GIL input lines 2 and GIL output lines 7.

The difference with embodiment 1 is that the plug-in cable head 3 for experimental test is designed in the fully-insulated incoming line structure of the boost substation, so that corresponding tests, such as pressurization tests, are conveniently performed on three phases of the first gas-insulated metal-enclosed switch 4 or three phases of the second gas-insulated metal-enclosed switch 8, and meanwhile, the plug-in cable head 3 is adopted to be preferably and quickly plugged, so that connection is convenient, and replacement time is saved.

Further, as shown in fig. 1, three plug-in cable heads 3 on the GIL input line 2 and three plug-in cable heads 3 on the GIL output line 7 are respectively provided, which correspond to three-phase interfaces of the first gas insulated metal-enclosed switch 4 and the second gas insulated metal-enclosed switch 8.

Three plug-in cable heads 3 on the GIL input line 2 or the GIL output line 7 respectively correspond to the circuit breakers of the first gas-insulated metal-enclosed switch 4 or the second gas-insulated metal-enclosed switch 8, the grounding switch and the voltage transformer, and through switching on and off the three-station isolating switch 5, the first gas-insulated metal-enclosed switch 4 and the second gas-insulated metal-enclosed switch 8, a GIS experiment tool can be connected in the plug-in cable heads at corresponding positions to carry out pressurization experiments on each item of the first gas-insulated metal-enclosed switch 4 and the second gas-insulated metal-enclosed switch 8, so that the line safety is ensured.

The specific implementation mode of the application is as follows:

the external power supply or power generation equipment is assembled through a first switch power distribution cabinet 1 with 35kV low voltage, the first switch power distribution cabinet 1 is connected with a first gas insulated metal-enclosed switch 4 in a sealing mode through a GIL input line 2, the first gas insulated metal-enclosed switch 4 comprises a circuit breaker, a grounding switch and a voltage transformer, the circuit breaker is used for line disconnection, the grounding switch is used for equipment maintenance, and the voltage transformer is used for equipment monitoring. The first gas-insulated metal-enclosed switch 4 is connected to the step-up transformer 6 through the GIL transmission line 2, wherein a three-station isolating switch 5 is arranged at the connection position of the GIL transmission line 2 and the step-up transformer 6, after the step-up transformer 6 is stepped up, the gas-insulated metal-enclosed switch enters the GIL output line 7 through the other three-station isolating switch 5, the GIL output line 7 is connected with the second gas-insulated metal-enclosed switch 8, the second gas-insulated metal-enclosed switch 8 also comprises a circuit breaker, a grounding switch and a voltage transformer, the circuit breaker is used for line disconnection, the grounding switch is used for equipment maintenance, the voltage transformer is used for equipment monitoring, the second gas-insulated metal-enclosed switch 8 is connected with the second switch power distribution cabinet 9 through the GIL output line 7, and finally high-voltage power is conveyed into a power grid. The three-phase plug-in cable heads 3 are arranged on the GIL input line 2 and the GIL output line 7, when in field wire inlet equipment test, the plug-in cable heads 3 can be used for pressurizing, and the related test requirements of the transformer, the first gas-insulated metal-enclosed switch 4 and the second gas-insulated metal-enclosed switch 8 can be met by switching on and off the three-station disconnecting switch 5 and the first gas-insulated metal-enclosed switch 4 in the low-voltage section or switching off the three-station disconnecting switch 5 and the second gas-insulated metal-enclosed switch 8 in the high-voltage section.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A fully insulated incoming line structure for a step-up substation, characterized by comprising:

A low-voltage section, wherein the current in the low-voltage section flows through the power generation equipment into the first switch distribution cabinet (1), the GIL input line (2), the first gas-insulated metal-enclosed switch (4), the GIL input line (2), and finally into the step-up transformer (6);

A high-voltage section, wherein the current in the high-voltage section is boosted by a boost transformer (6), passes through a GIL output line (7), a second gas-insulated metal-enclosed switch (8), and the GIL output line (7) in sequence, enters a second switch distribution cabinet (9), and finally flows into the power grid.

2. The fully insulated incoming line structure of a step-up substation according to claim 1, wherein the voltage in the low-voltage section is 35 kV; and the voltage in the high-voltage section is 110 kV or 220 kV.

3. The fully insulated incoming line structure of a step-up substation according to claim 1, characterized in that the insulating gas in the GIL input line (2) and the GIL output line (7) is SF6.

4. The fully insulated incoming line structure of the step-up substation according to claim 1, characterized in that the first gas-insulated metal-enclosed switch (4) and the second gas-insulated metal-enclosed switch (8) each include a circuit breaker, a grounding switch and a voltage transformer, wherein:

Circuit breakers are used to disconnect circuits;

The grounding switch is used for equipment maintenance;

Voltage transformers are used for equipment monitoring.

5. The fully insulated incoming line structure of the step-up substation according to claim 1 is characterized in that the GIL input line (2) and the GIL output line (7) are both connected to the step-up transformer (6) through a three-position disconnector (5).

6. The fully insulated incoming line structure of a step-up substation according to any one of claims 1 to 5, characterized in that pluggable cable heads (3) are provided on both the GIL input line (2) and the GIL output line (7).

7. The fully insulated incoming line structure of the step-up substation according to claim 6 is characterized in that there are three pluggable cable heads (3) on the GIL input line (2) and three pluggable cable heads (3) on the GIL output line (7), respectively corresponding to the three-phase interfaces of the first gas-insulated metal-enclosed switch (4) and the second gas-insulated metal-enclosed switch (8).