Separating and sealing device for low-voltage connecting box of three-phase combined transformer

Abstract

A separating and sealing device of a low-voltage connecting box of a three-phase combined type transformer comprises a plurality of supports installed in the low-voltage connecting box, a plurality of separating plates are connected to the supports, and inflatable air bag sealing rings are arranged between the separating plates and the low-voltage connecting box. The two separating and sealing devices are installed in the low-voltage connecting box, then the sealing rings are inflated, the gaps between the separating plates and the low-voltage connecting box, the gaps between every two adjacent separating plates and the gaps between the separating plates and the flow guide copper pipes are sealed through the expansion sealing rings, and therefore the difficult problems of phase-by-phase oil discharging and phase-by-phase overhauling of a transformer are solved.

Description

Technical Field

[0001] The utility model belongs to the field of transformer maintenance and relates to a separation and sealing device for a low-voltage connection box of a three-phase combined transformer. Background Art

[0002] A three-phase combined transformer is composed of three single-phase transformers with various oil tanks. The high-voltage side YN connections are completed in their respective oil tanks, while the low-voltage side "△" connections are completed in a connection box shared by all three phases and interconnected. Due to various limitations, transformer maintenance is generally performed phase by phase. To avoid exposing the other two phases while repairing one phase, and to ensure a more scientific and reasonable maintenance, it is necessary to completely isolate the three phases after completing the low-voltage connection box maintenance, and ensure that each phase is independently vacuumed and inflated for storage to complete the transformer phase-by-phase maintenance. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a separation and sealing device for a low-voltage connection box of a three-phase combined transformer, which is used to solve the difficult problem of phase-by-phase maintenance of the transformer.

[0004] In order to solve the above problems, the technical solution of the utility model is:

[0005] A three-phase modular transformer includes multiple brackets mounted within a low-voltage connection box, multiple partitions connected to the brackets, and an inflatable airbag seal between the partitions and the low-voltage connection box. After the low-voltage connection box is overhauled, two partitioning seals divide the low-voltage connection box into three independent compartments, completely isolating the three phases. Each phase is independently evacuated and inflated for storage, allowing for phase-by-phase oil draining and maintenance.

[0006] The beneficial effects of the utility model are:

[0007] 1. Since there are low-voltage, high-current copper tube leads and neutral point copper rod leads inside the low-voltage connection box, the general sealing method cannot effectively isolate the three phases. For this reason, the present invention adopts a combined sealing method of an inflatable airbag sealing ring and a partition to isolate them. In addition, insulating screws are needed to seal the two ends of the guide copper tube. This sealing method can not only isolate and seal the channels without equipment inside, but also seal the channels of irregular structural parts arranged inside.

[0008] 2. After the low-voltage connection box blocks access to the three-phase transformer's oil tank, the three-phase combined transformer can be drained and repaired separately. The three-phase combined transformer can be repaired using the same maintenance methods as a single-phase transformer. This not only minimizes the exposure time of the three-phase components and effectively prevents the transformer's insulation from moisture, but also facilitates scientific, rational, and flexible scheduling of maintenance work, effectively reducing maintenance workload and costs, and better ensuring the maintenance weight of the three-phase transformer.

[0009] 3. By isolating the three-phase oil tank access with a low-voltage inflatable airbag seal and partition, the complex maintenance method of the three-phase combined transformer is transformed into the maintenance method of a single-phase transformer. This is novel, innovative, and practical, and can be widely applied to the maintenance of all three-phase combined oil-immersed transformers. In addition, this isolation and sealing method can be used for the isolation and sealing of other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below with reference to the accompanying drawings:

[0011] Figure 1 This is a schematic diagram of the structure of the utility model.

[0012] Figure 2 This is a structural diagram of the separation and sealing device of the present utility model.

[0013] In the figure: low-voltage connection box 1, partition 2, bracket 3, sealing ring 4, and guide copper tube 5. DETAILED DESCRIPTION

[0014] like Figure 1 and 2 As shown, a separation and sealing device for a low-voltage connection box of a three-phase combined transformer includes multiple brackets 3 installed in the low-voltage connection box 1, multiple partitions 2 are connected to the brackets 3, and an inflatable airbag sealing ring 4 is provided between the partitions 2 and the low-voltage connection box 1.

[0015] A three-phase combined transformer low-voltage connection box separation and sealing steps: The low-voltage connection box 1 has three-phase low-voltage high-current bushing leads and neutral point copper rod leads inside, and the box is not smooth around. Therefore, after the low-voltage connection box 1 is drained and repaired, an inflatable airbag sealing ring 4 is required for sealing. Due to the small size of the inlet and obstacles such as lead wires in the middle, the partition 2 is divided into multiple pieces and assembled. The partition 2 is made of lightweight aluminum plate or laminated wood. The partitions 2 are also sealed with inflatable airbag sealing rings 4. At the same time, the guide copper tube is blocked with an insulating screw. The inflatable airbag sealing ring 4 is made of oil-resistant rubber. The working medium is: Air, water and mineral oil; when installing, first install the bracket 3, then use screws to connect the partition 2 and the bracket 3 in sequence, then install the airbag sealing strip, and finally slowly fill the airbag sealing ring 4 with dry air, and establish a pressure of 0.1-0.12MPa according to the mechanical strength requirements of the equipment, so that the inflated airbag sealing ring 4 slowly expands and fills all gaps that need to be sealed and effectively seals; after blocking the passage between the three-phase low-voltage connection boxes 1, drain the oil and perform phase-by-phase maintenance on the three-phase combined transformer.

[0016] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A separation and sealing device for a low-voltage connection box of a three-phase combined transformer, characterized in that: The invention comprises a plurality of brackets (3) installed in a low-voltage connection box (1), a plurality of partitions (2) connected to the brackets (3), and a sealing ring (4) provided between the partitions (2) and the low-voltage connection box (1).

2. The separation and sealing device of a three-phase combined transformer low-voltage connection box according to claim 1, characterized in that: The sealing ring (4) is an inflatable airbag sealing ring (4).

3. The separation and sealing device of a three-phase combined transformer low-voltage connection box according to claim 1 or 2, characterized in that: The partition (2) is made of aluminum plate or laminated wood.

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