Combined electric appliance applied to offshore wind power low-frequency boosting system

Abstract

The embodiment of the utility model discloses a combined electric appliance applied to an offshore wind power low-frequency boost system, which comprises a transformer side cable chamber, a submarine cable side cable chamber, an instrument chamber and a sealed tank body, and a vacuum circuit breaker and a three-station isolating / grounding switch are correspondingly arranged in the tank body. The vacuum circuit breaker and the three-position isolating / grounding switch are correspondingly and electrically connected through a conductor, the vacuum circuit breaker is communicated with the transformer side cable chamber through a wire outlet sleeve, and the three-position isolating / grounding switch is communicated with the submarine cable side cable chamber through a wire outlet sleeve. The device is based on 66kV voltage class, is safe and reliable, and can be used for new energy application scenes such as offshore wind power. The utility model has the advantages of simpler structure and higher reliability.

Description

Technical Field

[0001] The utility model relates to the field of offshore electrical equipment, in particular to a combined electrical apparatus applied to a low-frequency step-up system of offshore wind power. Background Technique

[0002] At present, the development of offshore wind power resources in China's coastal areas is approaching the end, and the construction of offshore wind power is gradually moving towards the far sea. The loss of long-distance power transmission has become a major problem. By reducing the frequency to increase the cable current-carrying capacity, the effective load capacity of the cable is improved, and the power transmission distance is greatly extended. At present, in the new energy environment of low-frequency power transmission for offshore wind power, there is an urgent need for a combined electrical apparatus that can solve the breaking problem in the low-frequency step-up system of offshore wind power. Content of the Utility Model

[0003] The technical problem to be solved by the embodiment of the utility model is to provide a combined electrical apparatus applied to a low-frequency step-up system of offshore wind power to solve the breaking problem in the low-frequency step-up system of offshore wind power.

[0004] To solve the above technical problem, the embodiment of the utility model provides a combined electrical apparatus applied to a low-frequency step-up system of offshore wind power, which includes a transformer-side cable chamber, a submarine cable-side cable chamber, an instrument chamber, and a sealed tank body. A vacuum circuit breaker and a three-position disconnector / earthing switch are correspondingly arranged in the tank body. The vacuum circuit breaker and the three-position disconnector / earthing switch are correspondingly electrically connected through a conductor. The vacuum circuit breaker is connected to the transformer-side cable chamber through an outgoing line bushing, and the three-position disconnector / earthing switch is connected to the submarine cable-side cable chamber through an outgoing line bushing.

[0005] Further, the tank body is filled with an environmentally friendly insulating gas.

[0006] Further, it also includes a base. The submarine cable-side cable chamber and the tank body are arranged on the base. The vacuum circuit breaker is arranged on the upper side inside the tank body. The instrument chamber is arranged on the submarine cable-side cable chamber, and the transformer-side cable chamber is arranged on the instrument chamber.

[0007] Further, the tank body is divided into two parts connected up and down.

[0008] Further, an anti-corrosion paint layer is provided on the surface of the tank body.

[0009] Further, there are 3 groups of three-position disconnector / earthing switches, and the 3 groups of three-position disconnector / earthing switches are correspondingly electrically connected through a conductor.

[0010] Further, there are 2 submarine cable-side cable chambers, and the 2 submarine cable-side cable chambers are correspondingly arranged on both sides of the tank body.

[0011] Further, the vacuum circuit breaker is an integral vacuum circuit breaker for a dedicated 72.5 kV low-frequency AC switchgear, and the instrument chamber is used to control the vacuum circuit breaker.

[0012] The beneficial effects of the present utility model are as follows: Based on the voltage level of 66 kV, the present utility model is safe and reliable and can be used in new energy application scenarios such as offshore wind power; the structure of the present utility model is simpler and the reliability is higher. Description of the Drawings

[0013] Figure 1 It is a three-dimensional structural diagram of an angle of the combined electrical apparatus applied to the low-frequency step-up system of offshore wind power in an embodiment of the present utility model.

[0014] Figure 2 It is a three-dimensional structural diagram of another angle of the combined electrical apparatus applied to the low-frequency step-up system of offshore wind power in an embodiment of the present utility model.

[0015] Figure 3 It is an internal three-dimensional structural diagram of the combined electrical apparatus applied to the low-frequency step-up system of offshore wind power in an embodiment of the present utility model.

[0016] Figure 4 It is an internal structural diagram of the combined electrical apparatus applied to the low-frequency step-up system of offshore wind power in an embodiment of the present utility model.

[0017] Description of the Reference Numerals in the Drawings

[0018] Transformer-side cable chamber 1, submarine cable-side cable chamber 2, instrument chamber 3, tank body 4, base 5, vacuum circuit breaker 6, three-position disconnector / earthing switch 7, conductor 8, outgoing bushing 9. Detailed Embodiments

[0019] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0020] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, in the present utility model, the descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0022] Please refer to Figures 1 to 4 , the combined electrical apparatus applied to the low-frequency step-up system of offshore wind power in the embodiments of the present utility model includes a transformer-side cable chamber, a submarine cable-side cable chamber, an instrument chamber, a tank body, and a base.

[0023] The tank body is sealed, and a vacuum circuit breaker and a three-position disconnector / earthing switch are correspondingly arranged inside the tank body. All primary components of the present utility model are sealed in the tank body, without being connected by an intermediate insulating part (pot-type insulator), and the structure is simpler and the reliability is higher.

[0024] The vacuum circuit breaker and the three-position disconnector / earthing switch are correspondingly electrically connected through a conductor. The vacuum circuit breaker is connected to the transformer side cable chamber through an outlet bushing, and the three-position disconnector / earthing switch is connected to the submarine cable side cable chamber through an outlet bushing. The present utility model adopts an insert-type outlet design, and its inlet and outlet positions are composed of an outlet bushing and an insert-type cable head. The outlet bushing is connected to a copper bar inside the cable chamber and extends outside the cable chamber, and then is connected to the cable through an external cone cable head. Different from the conventional combined electrical apparatus that adopts an insulator-type outlet bushing design, the outlet of the present utility model adopts a fully insulated design, which is convenient for installation and maintenance, has a small floor area, does not contact the outside world, and is more suitable for the marine humid environment. Preferably, the transformer side cable chamber, the submarine cable side cable chamber, and the instrument chamber are metal compartments. The metal compartments of the present utility model wrap the cable accessory part and have a high IP rating and an arc-proof function.

[0025] As an implementation manner, the tank body is filled with an environmentally friendly insulating gas. The present utility model uses an environmentally friendly insulating gas as the main insulating medium, and no toxic and harmful substances are generated during the insulation process, having no impact on the environment.

[0026] As an implementation manner, the submarine cable side cable chamber and the tank body are arranged on a base. The vacuum circuit breaker is arranged on the upper side inside the tank body, the machine incoming line is located above the vacuum circuit breaker, and the three-position disconnector / earthing switch is located on the other side, realizing the isolation and earthing functions of the incoming line side. The instrument chamber is arranged on the submarine cable side cable chamber, and the transformer side cable chamber is arranged on the instrument chamber.

[0027] As an implementation manner, the tank body is divided into two parts connected up and down. The present utility model adopts a connection method of up and down connection and is divided into two parts, which is more suitable for the inside of a wind turbine tower barrel and has the ability to maintain all components through the tower barrel door.

[0028] As an implementation manner, an anti-corrosion paint layer is provided on the surface of the tank body. The present utility model has made special anti-corrosion treatments for the marine salt spray and humid environment. The outer shells such as the tank body have all been subjected to special surface treatments such as painting. The main components adopt a surface treatment method of zinc-nickel plating, and the bolts at the main positions adopt a surface treatment method such as Dacromet, having a protection ability of C4-H; through multiple protections, the IP rating of the product is improved to prevent water vapor from entering; a heating and dehumidifying device can also be set to remove the possible water vapor.

[0029] As an implementation manner, there are 3 groups of three-position disconnector / earthing switches, and the 3 groups of three-position disconnector / earthing switches are correspondingly electrically connected through a conductor.

[0030] As an implementation manner, there are two cable chambers on the submarine cable side, and the two cable chambers on the submarine cable side are correspondingly arranged on both sides of the tank body. The three-position disconnector / earthing switch is connected through a busbar, and is also connected to the outgoing bushing, and is connected to the cable chamber on the submarine cable side through a plug-in cable.

[0031] As an implementation manner, the vacuum circuit breaker is an integral vacuum circuit breaker for a dedicated 72.5 kV low-frequency AC switchgear, and the instrument chamber is used to control the vacuum circuit breaker. The vacuum breaking of the integral vacuum circuit breaker will not generate toxic and harmful substances, and has high performance and a large number of operations.

[0032] The utility model can be applied to a 66 kV offshore wind power step-up system, and its switchgear structure is GIS. At present, combined electrical appliances are mostly applied to substations, and their voltage levels range from 110 kV, 220 kV to 550 kV, etc., and can be as high as 1100 kV. However, as an infrequently used voltage level, there is no mature product for 66 kV. Based on the 66 kV voltage level, the utility model is safe and reliable and can be used in new energy application scenarios such as offshore wind power.

[0033] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the appended claims and their equivalent scope.

Claims

1. A combined electrical apparatus applied to a low-frequency step-up system for offshore wind power, characterized in that, It includes a cable chamber on the transformer side, a cable chamber on the submarine cable side, an instrument chamber, and a sealed tank body. A vacuum circuit breaker and a three-position disconnector / earthing switch are correspondingly arranged in the tank body. The vacuum circuit breaker and the three-position disconnector / earthing switch are correspondingly electrically connected through a conductor. The vacuum circuit breaker is connected to the cable chamber on the transformer side through an outgoing bushing, and the three-position disconnector / earthing switch is connected to the cable chamber on the submarine cable side through an outgoing bushing.

2. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power according to claim 1, characterized in that, The tank body is filled with an environment-friendly insulating gas.

3. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power according to claim 1, characterized in that, It also includes a base. The cable chamber on the submarine cable side and the tank body are arranged on the base. The vacuum circuit breaker is arranged on the upper side inside the tank body. The instrument chamber is arranged on the cable chamber on the submarine cable side, and the cable chamber on the transformer side is arranged on the instrument chamber.

4. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power according to claim 1, wherein The tank body is divided into two parts connected up and down.

5. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power as claimed in claim 1, wherein, An anti-corrosion paint layer is provided on the surface of the tank body.

6. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power as claimed in claim 1, wherein, There are 3 groups of three-position disconnector / earthing switches, and the 3 groups of three-position disconnector / earthing switches are correspondingly electrically connected through a conductor.

7. The combined electrical apparatus applied to the offshore wind power low-frequency step-up system according to claim 6, characterized in that, There are 2 cable chambers on the submarine cable side, and the 2 cable chambers on the submarine cable side are correspondingly arranged on both sides of the tank body.

8. The combined electrical apparatus applied to the low-frequency step-up system of offshore wind power according to claim 1, wherein The vacuum circuit breaker is an integrated vacuum circuit breaker for a dedicated 72.5 kV low-frequency AC switchgear, and the instrument chamber is used to control the vacuum circuit breaker.

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