Electrode boiler power supply wiring structure for thermal power plant

Abstract

The utility model discloses an electrode boiler power supply wiring structure for a thermal power plant. The device comprises a starting / standby transformer, a common-box enclosed bus, an insulating tube type bus, a medium-voltage working 1A section, a medium-voltage working 1B section, a medium-voltage working 2A section, a medium-voltage working 2B section, a medium-voltage electrode boiler A section and a medium-voltage electrode boiler B section, the low-voltage side of the starting / standby transformer is connected to a medium-voltage working 1A section, a medium-voltage working 1B section, a medium-voltage working 2A section and a medium-voltage working 2B section through a common-box enclosed bus; and the medium-voltage electrode boiler section A and the medium-voltage electrode boiler section B are connected to the common-box enclosed bus through the insulating tubular bus T to obtain a power supply. According to the utility model, the medium-voltage electrode boiler section A and the medium-voltage electrode boiler section B are connected to the common-box enclosed bus through the insulating tubular bus T to obtain a power supply, so that wiring can be simplified, and the number of medium-voltage switch cabinets can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power engineering for thermal power plants, and in particular relates to a power supply wiring structure for an electrode boiler in a thermal power plant. Background Art

[0002] The startup boiler is a conventional auxiliary configuration of a newly built thermal power plant. When the unit is started, it provides auxiliary steam that meets the requirements of pressure, flow and other parameters for various steam-using points such as boiler cold and hot cleaning, deaerator heating, shaft seal steam, and feed pump turbine start-up (if necessary).

[0003] Start-up boilers are industrial steam boilers, which can be divided into oil-fired boilers, coal-fired boilers, gas-fired boilers and electric boilers according to the fuel used. The start-up boilers of thermal power units are mainly oil-fired boilers, with a few using coal-fired or gas-fired boilers.

[0004] As a new type of start-up boiler, the electrode boiler has the advantages of high efficiency, small footprint, fast start-up speed, low carbon and no pollution.

[0005] Electrode boilers are powered by medium voltage (6kV or 10kV), and the capacity of a single electrode boiler is 4-40MW. The total capacity of the electrode boiler of a 1000MW unit is about 60MW, equivalent to 70% of the conventional plant power load.

[0006] like Figure 1 As shown in the figure, currently some thermal power plants adopt the scheme of connecting the medium-voltage electrode boiler section to the common section. Due to the large load of the electrode boiler section, the common section can only adopt the scheme of taking one power supply from each machine working section. This scheme requires the use of multiple large-section cables, resulting in tight cable channels, and the common section is far away from the electrode boiler section, making it difficult to connect the conductors.

[0007] Therefore, how to provide a reasonable power supply plan for electrode boilers in thermal power plants is an urgent problem to be solved at this stage. Utility Model Content

[0008] The purpose of the utility model is to solve the deficiencies of the above-mentioned background technology and to provide a power supply wiring structure for an electrode boiler in a thermal power plant.

[0009] The technical scheme adopted by the utility model is: an electrode boiler power supply wiring structure for a thermal power plant, comprising a starting / standby transformer, a common box enclosed busbar, an insulated tubular busbar, a medium-voltage working section 1A, a medium-voltage working section 1B, a medium-voltage working section 2A, a medium-voltage working section 2B, a medium-voltage electrode boiler section A and a medium-voltage electrode boiler section B; the low-voltage side of the starting / standby transformer is connected to the medium-voltage working section 1A, the medium-voltage working section 1B, the medium-voltage working section 2A and the medium-voltage working section 2B through the common box enclosed busbar; the medium-voltage electrode boiler section A and the medium-voltage electrode boiler section B are connected to the common box enclosed busbar through the insulated tubular busbar T to obtain power.

[0010] The beneficial effects of the utility model are as follows:

[0011] 1. The medium-voltage electrode boiler section A and the medium-voltage electrode boiler section B of the utility model are connected to the common box enclosed busbar through the insulating tubular busbar T to obtain power, which can simplify wiring and reduce the number of medium-voltage switch cabinets.

[0012] 2. The insulated tubular busbar of the utility model utilizes the path and bracket of the cable bridge of the main plant, thereby reducing the space occupied by the cable channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the power supply scheme for the electrode boiler of an existing thermal power plant;

[0014] Figure 2 This is a schematic diagram of the power supply scheme for the electrode boiler in a thermal power plant of the utility model.

[0015] In the figure: 1- starting / standby transformer; 2- common box enclosed busbar; 3- cable; 4- insulated tubular busbar; 5- medium voltage working section 1A; 6- medium voltage working section 1B; 7- medium voltage working section 2A; 8- medium voltage working section 2B; 9- medium voltage public section A; 10- medium voltage public section B; 11- medium voltage electrode boiler section A; 12- medium voltage electrode boiler section B. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0017] like Figure 2 As shown, the utility model includes a starting / standby transformer 1, a common box enclosed busbar 2, an insulated tubular busbar 4, a medium-voltage working 1A section 5, a medium-voltage working 1B section 6, a medium-voltage working 2A section 7, a medium-voltage working 2B section 8, a medium-voltage electrode boiler A section 11 and a medium-voltage electrode boiler B section 12.

[0018] The low-voltage side of the starting / standby transformer 1 is connected to the medium-voltage working 1A section 5, the medium-voltage working 1B section 6, the medium-voltage working 2A section 7, and the medium-voltage working 2B section 8 through the common-box enclosed busbar 2.

[0019] The medium-voltage electrode boiler section A 11 and the medium-voltage electrode boiler section B 12 are connected to the common box enclosed bus 2 through the insulated tubular bus 4T to obtain power.

[0020] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A power supply wiring structure for an electrode boiler in a thermal power plant, characterized in that: The invention comprises a starting / standby transformer (1), a common box enclosed busbar (2), an insulated tubular busbar (4), a medium-voltage working section 1A (5), a medium-voltage working section 1B (6), a medium-voltage working section 2A (7), a medium-voltage working section 2B (8), a medium-voltage electrode boiler section A (11) and a medium-voltage electrode boiler section B (12); the low-voltage side of the starting / standby transformer (1) is connected to the medium-voltage working section 1A (5), the medium-voltage working section 1B (6), the medium-voltage working section 2A (7) and the medium-voltage working section 2B (8) through the common box enclosed busbar (2); the medium-voltage electrode boiler section A (11) and the medium-voltage electrode boiler section B (12) are connected to the common box enclosed busbar (2) through the insulated tubular busbar (4) to obtain power.

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