High-voltage incoming line PT cabinet

Abstract

The utility model provides a high-voltage incoming line PT cabinet which comprises a cabinet body, a PT1 chamber and a PT2 chamber are arranged in the cabinet body, a first voltage transformer is installed in the PT1 chamber, a second voltage transformer is installed in the PT2 chamber, the first voltage transformer and the second voltage transformer are installed in a front-and-back and left-and-right staggered mode, the PT2 chamber is provided with a cable channel, a cable of the first voltage transformer goes down through the cable channel, and a cable of the second voltage transformer goes down through the cable channel. And the cable of the second voltage transformer directly goes down to the cable trench through the cable hole in the bottom plate of the cabinet body after passing through the cable hole of the cabinet body to the cable trench. The beneficial effects of the utility model are that the independent incoming line PT cabinet is arranged, the PTs of the two incoming line cabinets are arranged in the incoming line PT cabinet, and the incoming line PT cabinet is connected with the corresponding PTs through cables, so that the incoming line switch cabinet can be designed and interchanged according to other switch cabinets of the same engineering project, and the standardized design is easier to realize; and the pressure relief channel is not influenced by the shielding of the voltage transformer.

Description

Technical Field

[0001] The utility model relates to the application field of 10 kV high-voltage power transmission and distribution, in particular to a high-voltage incoming line PT cabinet. Background Technique

[0002] With the gradual progress and implementation of the distribution network construction reform projects and projects, the market prospect of medium-voltage switch cabinets in China's power grid will become increasingly broad.

[0003] In order to ensure the reliability and safety of substations and to meet the reliable power supply requirements of the power grid. In switch nodes, there is often a scheme of two incoming line power supplies. To achieve the following purposes:

[0004] 1. Reliability: When one incoming line cabinet fails, the other incoming line cabinet can be used as a backup incoming line cabinet to ensure the continuous operation of the system. At the same time, the two incoming line cabinets can be used as backups for each other, improving the reliability of the ring main unit.

[0005] 2. Adjustable operation: The two incoming line cabinets can be used to realize the switching operation of the ring main unit. During the test and maintenance process, one incoming line cabinet can be used as a powered-off working section, while the other incoming line cabinet can be used for operation, thus ensuring the continuous power supply of the system.

[0006] At the same time, in order to realize the functions of the incoming line cabinet, it is necessary to detect the incoming line power supply. It is often necessary to hang a voltage transformer on the incoming line side to monitor the incoming line voltage. At the same time, it can also provide low-voltage power for the switch station.

[0007] In the whole set of cabinets in the switch station, it is often necessary to configure an integrated measurement and control communication unit, communication security protection equipment, partial discharge on-line monitoring device, power supply module, etc. to meet the needs of automatic complete sets of equipment.

[0008] Therefore, in order to meet the needs of distribution or ring main switch stations, a high-voltage incoming line PT cabinet is designed to integrate the above-mentioned common equipment required by the whole switch station into a cabinet to the greatest extent.

[0009] In the industry, there are various ways to connect the PT voltage transformer in the incoming line unit, and there are few clear regulations on the installation positions of public electrical equipment or components.

[0010] 1. The PT voltage transformer is installed behind the incoming line cable through a rear-insert cable accessory to access the high-voltage primary circuit. The transformer body is directly placed behind the cable chamber of this unit. This method has the following defects:

[0011] 1.1 The maintenance of PT and its accessories is rather cumbersome. The incoming cable head needs to be removed before the PT and its accessories can be replaced. Especially when the entire set of switchgear cabinets is installed against the wall, and the PT can only be maintained and operated from the front of the cabinet, and when the cross-section of the incoming cable is large, the cable needs to be completely withdrawn from the cable chamber, which is extremely difficult to operate.

[0012] 1.2 Since the PT occupies the pressure relief channel at the lower rear of the cable chamber, it destroys the original layout of the cable chamber and the pressure relief channel, which is not conducive to the pressure release of faults such as arc burning.

[0013] II. The PT voltage transformer is installed behind the incoming cable through a rear-insert cable accessory to access the high-voltage primary circuit. However, the PT itself is transferred to the top of the cabinet of this unit through a cable. This method has the following defects:

[0014] 2.1 This method is not safe. It is equivalent to the cable in the cable chamber being directly outside the box, which does not meet the five-prevention requirements. Moreover, the cable still passes through the pressure relief chamber and turns up. It brings a great deal of workload to the structure of the incoming unit cabinet and the cable routing process.

[0015] 2.2 In recent years, almost every incoming and outgoing line unit of all automated complete power switchgear has a secondary control room, which needs to occupy the front half of the top of the switchgear cabinet. If the PT is placed on the top of the cabinet, it will greatly affect the installation space of the secondary control room.

[0016] III. In the substation, for the installation positions of common electrical equipment or components such as integrated measurement and control communication units, communication security protection equipment, partial discharge on-line monitoring devices, and power modules that are often used, there is no clear and unified regulation in the relocation projects in the region. It causes inconvenience to the later operation, maintenance, upgrade, management and other work. Summary of the Invention

[0017] In order to solve the problems existing now, such as the cumbersome maintenance of the PT voltage transformer, the unfavorable pressure release of faults such as arc burning, and the huge workload of the cable routing process, the present invention provides a high-voltage incoming PT cabinet, including a cabinet body. The cabinet body is provided with a PT1 chamber and a PT2 chamber. A first voltage transformer is installed in the PT1 chamber, and a second voltage transformer is installed in the PT2 chamber. The first voltage transformer and the second voltage transformer are installed staggeredly in the front and back and left and right directions. The PT2 chamber is provided with a cable channel. The cable of the first voltage transformer descends through the cable channel, passes through the cable hole of the cabinet body to the cable trench, and the cable of the second voltage transformer directly descends through the cable hole of the cabinet body floor to the cable trench.

[0018] As a further improvement of the present invention, a secondary instrument chamber is also provided in the cabinet body. Secondary control equipment is installed in the secondary instrument chamber. The secondary control equipment walks secondary control lines to each switchgear cabinet and its control equipment at the substation through the busbar chamber installed on the top of the cabinet body.

[0019] As a further improvement of the present utility model, the secondary control device includes an intelligent gateway, a power circuit breaker, a power supply module, an intelligent communication module, a meter, a comprehensive measurement and control module, and an indicator light.

[0020] As a further improvement of the present utility model, the secondary instrument room is provided with an inner door and an outer door of the instrument room. The meter, the indicator light, and the comprehensive measurement and control module are installed on the inner door of the instrument room. The outer door of the instrument room is provided with a transparent window for observing the meter, the indicator light, and the comprehensive measurement and control module.

[0021] As a further improvement of the present utility model, a battery room is also provided in the cabinet. A storage battery is installed in the battery room. The storage battery provides power for the secondary equipment of the switchgear at the switch site when the main power is cut off. The capacity of the storage battery is selected according to the load.

[0022] As a further improvement of the present utility model, the battery room is provided with a battery room door.

[0023] As a further improvement of the present utility model, an ODF room and a fiber optic channel room are also provided in the cabinet. The ODF room runs secondary control lines to each switchgear and its control equipment at the site through the busbar room installed on the top of the cabinet, or uses optical fibers to go down to the cable trench through the fiber optic channel room to transmit data to the background.

[0024] As a further improvement of the present utility model, a grounding busbar is also provided in the cabinet. The grounding busbar can be connected to the grounding grid of the switch station.

[0025] As a further improvement of the present utility model, the first voltage transformer and the second voltage transformer are voltage transformers of single-phase PT, VV connection PT, and star connection PT. The high-voltage wiring of the first voltage transformer and the second voltage transformer is connected to the corresponding incoming line switchgear through cables and through the cable trench.

[0026] As a further improvement of the present utility model, the PT1 room and the PT2 room are also respectively provided with a PT1 room door and a PT2 room door; the cabinet is made of 2.0-mm thick aluminized zinc plate bent and spliced.

[0027] The beneficial effects of the present utility model are as follows: 1. An independent incoming line PT cabinet is set up, and the PTs of the two incoming line cabinets are installed in this incoming line PT cabinet and connected to the corresponding PTs through cables, enabling the incoming line switchgear cabinets to be designed and interchanged in the same way as other switchgear cabinets in the same engineering project, making it easier to achieve standardized design, and its pressure relief channel is no longer affected by the shielding of the voltage transformer; 2. The width of the incoming line PT cabinet is basically only affected by the width of the installed voltage transformer, without affecting the standardized production of the switchgear cabinet. The primary equipment can ensure operation and maintenance from the front. When maintaining one of the voltage transformers, since it is completely isolated from the other voltage transformer chamber, only the switchgear cabinet connected to the currently maintained voltage transformer needs to be powered off; 3. The common secondary electrical modules of the switchyard can be centralized in this incoming line PT cabinet, facilitating secondary wiring and process control, bringing convenience to subsequent operation, maintenance, upgrade, management, etc. The secondary rooms of other switchgear cabinets are easier to be simple and clear, which is beneficial to the operation and maintenance of the switchgear cabinets; 4. The problem of the protection level that was not easy to control in the original incoming line switchgear cabinet is concentrated in the incoming line PT cabinet for handling, making it easier to control from the processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the schematic diagram of the high-voltage primary circuit of the present utility model;

[0029] Figure 2 is the front view of the high-voltage incoming line PT cabinet of the present utility model;

[0030] Figure 3 is the side view of the high-voltage incoming line PT cabinet of the present utility model;

[0031] Figure 4 is the PT chamber diagram of the high-voltage incoming line PT cabinet of the present utility model;

[0032] Reference numerals: 1 - cabinet body, 2 - busbar chamber, 3 - secondary instrument chamber, 4 - ODF chamber, 5 - battery chamber, 6 - inner door of the instrument chamber, 7 - outer door of the instrument chamber, 8 - battery chamber door, 9 - PT1 chamber door, 10 - optical fiber channel chamber, 11 - PT1 chamber, 12 - first voltage transformer, 13 - cable channel, 14 - PT2 chamber door, 15 - PT2 chamber, 16 - second voltage transformer, 17 - grounding busbar; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In recent years, China Southern Power Grid has put forward clear specifications for the incoming line PT cabinet, and has made specific specifications for the parallel cabinet size, equipment layout, and function requirements. This has pointed out the direction for the design and development of this functional unit.

[0034] The present utility model is a high-voltage incoming line PT cabinet, which proposes a specific solution to the problems in the background technology and meets the requirements of the Southern Power Grid specifications.

[0035] The utility model discloses a high-voltage incoming line PT cabinet. The cabinet body 1 is formed by bending and splicing 2.0-mm-thick aluminized zinc plates. The high-voltage primary circuit is as follows Figure 1 as shown, and the overall layout is as follows Figures 2 - 4 as shown.

[0036] The main body part mainly consists of the following components:

[0037] The cabinet body 1, the busbar chamber 2, the secondary instrument chamber 3, the ODF chamber 4, the battery chamber 5, the inner door 6 of the instrument chamber, the outer door 7 of the instrument chamber, the battery chamber door 8, the PT1 chamber door 9, the optical fiber channel chamber 10, the PT1 chamber 11, the first voltage transformer 12, the PT1 cable channel 13, the PT2 chamber door 14, the PT2 chamber 15, the second voltage transformer 16, and the grounding busbar 17.

[0038] The ODF chamber 4 is an optical fiber distribution box or a distribution frame, and devices such as ONU, OLT, and switches are installed inside. The installation of these devices is equipped according to the actual needs of the engineering project, and installation positions are reserved in the incoming line PT cabinet.

[0039] Installation method:

[0040] 1) Using the cabinet body 1 as the support body, assemble according to the Figure 2 structural schematic layout. When installing the voltage transformer, the first voltage transformer 12 is installed in the PT1 chamber 11, and the second voltage transformer 16 is installed in the PT2 chamber 15. When installing the voltage transformer, it is staggered both front and back and left and right. The cable of the first voltage transformer 12 descends through the PT1 cable channel 13 and reaches the cable trench through the cable hole of the cabinet body 1; the cable of the second voltage transformer 16 directly descends through the cable hole of the bottom plate of the cabinet body 1 to the cable trench. The two are separated by the PT1 cable channel 13 according to the protection level between compartments and do not interfere with each other.

[0041] 2) Various meters, indicator lights, integrated measurement and control modules, etc. can be installed on the inner door 6 of the instrument chamber; the outer door 7 of the instrument chamber observes the information inside the instrument chamber through the glass installed on it and provides protection for various meters, indicator lights, integrated measurement and control modules, etc. on the inner door 6 of the instrument chamber.

[0042] 3) The battery chamber door 8, the PT1 chamber door 9, and the PT2 chamber door 14 provide protection for each compartment respectively.

[0043] 4) In the secondary instrument chamber 3, secondary control devices such as intelligent gateways, power air switches, power modules, intelligent communication modules, and various meters can be installed. The secondary control lines pass through the busbar chamber 2 on the top of the cabinet to each switch cabinet and its control devices at the site.

[0044] 5) The ODF room 4 provides installation space for the communication, remote operation control, and feedback devices of the switch station. It can route the secondary control lines to each switch cabinet and its control devices at the station through the busbar room 2 with serial numbers on the cabinet top, or use optical fibers to descend to the cable trench through the optical fiber channel room 10 to transmit data to the background.

[0045] 6) The battery room 5 can be equipped with batteries to provide power for the secondary equipment of the switch cabinets in the switch station during the power outage of the main body. The capacity is appropriately selected according to the load.

[0046] 7) A grounding busbar 17 is provided inside the high-voltage incoming line PT cabinet, which can be connected to the grounding grid of the switch station.

[0047] Figure 3 and 4 In [specific situation], according to the requirements of the scheme, various wiring methods of voltage transformers such as single-phase PT, VV connection PT, and star connection PT can be installed in the cabinet. The high-voltage wiring of the first voltage transformer 12 and the second voltage transformer 16 is connected to the corresponding incoming line switch cabinet through cables and through the cable trench.

[0048] The high-voltage incoming line PT cabinet disclosed by the present utility model does not require welding for the entire cabinet body. Its frame is assembled after being bent from high-quality aluminized zinc steel plates, and has the characteristics of high strength, convenient processing, strong interchangeability, etc. The structure is clear.

[0049] The beneficial effects of the present utility model are as follows: 1. An independent incoming line PT cabinet is established, and the PTs of the two incoming line cabinets are installed in this incoming line PT cabinet and connected to the corresponding PTs through cables, so that the incoming line switch cabinets can be designed and interchanged like other switch cabinets in the same engineering project, making it easier to achieve standardized design, and its pressure relief channel is no longer affected by the shielding of the voltage transformer; 2. The width of the incoming line PT cabinet is basically only affected by the width of the installed voltage transformer, which does not affect the standardized production of the switch cabinet. The primary equipment can ensure operation and maintenance from the front. When maintaining one of the voltage transformers, since it is completely isolated from the other voltage transformer room, only the switch cabinet connected to the currently maintained voltage transformer needs to be powered off; 3. The public secondary electrical modules of the switch station can be concentrated in this incoming line PT cabinet, which facilitates secondary wiring and process control, and brings convenience to subsequent operation, maintenance, upgrade, management, etc. The secondary rooms of other switch cabinets are easier to be simple and clear, which is beneficial to the operation and maintenance of the switch cabinets; 4. The problem of the protection level that was not easy to control in the original incoming line switch cabinet is concentrated in the incoming line PT cabinet for treatment, and it is easier to control from the processing technology.

[0050] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A high voltage incoming line PT cabinet, characterized in that: The invention comprises a cabinet (1), wherein a PT1 room (11) and a PT2 room (15) are arranged in the cabinet (1), a first voltage transformer (12) is installed in the PT1 room (11), and a second voltage transformer (16) is installed in the PT2 room (15), the first voltage transformer (12) and the second voltage transformer (16) are installed staggered front to back and left to right, the PT2 room (15) is provided with a cable channel (13), the cable of the first voltage transformer (12) passes through the cable channel (13) and descends to the cable trench through the cable hole of the cabinet (1), and the cable of the second voltage transformer (16) passes through the cable hole of the bottom plate of the cabinet (1) and descends to the cable trench.

2. The high-voltage incoming line PT cabinet according to claim 1 is characterized in that: The cabinet (1) is also provided with a secondary instrument room (3), in which a secondary control device is installed. The secondary control device is connected to each switch cabinet and each control device of the station through a secondary control line in a busbar room (2) installed on the top of the cabinet (1).

3. The high-voltage incoming line PT cabinet according to claim 2 is characterized in that: The secondary control equipment includes an intelligent gateway, a power circuit breaker, a power module, an intelligent communication module, a meter, a comprehensive measurement and control module, and an indicator light.

4. The high-voltage incoming line PT cabinet according to claim 3 is characterized in that: The secondary instrument room (3) is provided with an instrument room inner door (6) and an instrument room outer door (7); the meter, the indicator light, and the integrated measurement and control module are mounted on the instrument room inner door (6); and the instrument room outer door (7) is provided with a transparent window for observing the meter, the indicator light, and the integrated measurement and control module.

5. The high-voltage incoming line PT cabinet according to claim 1 is characterized in that: A battery room (5) is also provided in the cabinet (1), and a battery is installed in the battery room (5). The battery provides power for secondary equipment of the switch cabinet at the switch station when the main body is out of power. The capacity of the battery is selected according to the load.

6. The high-voltage incoming line PT cabinet according to claim 5 is characterized in that: The battery chamber (5) is provided with a battery chamber door (8).

7. The high-voltage incoming line PT cabinet according to claim 1 is characterized in that: The cabinet (1) is also provided with an ODF room (4) and an optical fiber channel room (10). The ODF room (4) is connected to each switch cabinet and its control equipment at the site through a secondary control line through a busbar room (2) installed on the top of the cabinet (1), or uses optical fiber to go down to a cable trench through the optical fiber channel room (10) to transmit data to the background.

8. The high-voltage incoming line PT cabinet according to claim 1 is characterized in that: A grounding busbar (17) is also provided in the cabinet (1), and the grounding busbar (17) can be connected to the switch station grounding network.

9. The high-voltage incoming line PT cabinet according to claim 1 is characterized in that: The first voltage transformer (12) and the second voltage transformer (16) are single-phase PT, VV connection PT, and star connection PT voltage transformers, and the high-voltage connections of the first voltage transformer (12) and the second voltage transformer (16) are connected to the corresponding incoming switch cabinet via cables and cable trenches.

10. The high-voltage incoming line PT cabinet according to claim 1, characterized in that: The PT1 room (11) and the PT2 room (15) are also provided with a PT1 room door (9) and a PT2 room door (14) respectively; the cabinet body (1) is formed by bending and splicing 2.0 thick aluminum-zinc plates.

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