An outdoor container type dry-type transformer temperature rise test auxiliary tool

Abstract

This utility model discloses an auxiliary fixture for temperature rise testing of an outdoor containerized dry-type transformer, comprising Z-shaped copper busbars, straight copper busbars, and an epoxy resin board. The left Z-shaped copper busbar corresponds to the left end of the straight copper busbar, and the right Z-shaped copper busbar corresponds to the right end of the straight copper busbar. A 3-5mm air gap is left between the overlapping joints of the Z-shaped and straight copper busbars. The a-phase lead copper busbar of the A-phase winding of the transformer is bolted to the left Z-shaped copper busbar, the b-phase lead copper busbar of the B-phase winding is bolted to the straight copper busbar, and the c-phase lead copper busbar of the C-phase winding is bolted to the right Z-shaped copper busbar. The beneficial effect of this utility model is that by using the outdoor containerized dry-type transformer temperature rise testing auxiliary fixture, it can be pre-fixed to the three-phase lead copper busbars of the transformer body during the temperature rise test, causing them to be short-circuited. When the temperature rise test is stable, the disconnection time of the three-phase lead copper busbars can be shortened, facilitating the measurement of three-phase resistance and improving the accuracy of the temperature rise test values.

Description

Technical Field

[0001] This utility model relates to an auxiliary tooling for outdoor containerized dry-type transformer temperature rise testing, belonging to the tooling manufacturing technology for transformer auxiliary temperature rise testing. Background Technology

[0002] With the rapid development of the economy and industry, the requirements for power safety are constantly being improved, and the random inspection of transformer temperature rise is being strengthened. When dry-type transformers are placed in outdoor box-type transformers or container-type enclosures, the small operating space makes it impossible to quickly disconnect the three-phase leads during temperature rise testing, which affects the accuracy of the temperature rise test. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this utility model provides an auxiliary tooling for testing the temperature rise of outdoor containerized dry-type transformers.

[0004] This utility model is achieved through the following technical solution:

[0005] An auxiliary fixture for temperature rise testing of an outdoor containerized dry-type transformer is characterized by comprising a Z-shaped copper busbar, a straight copper busbar, and an epoxy resin board. The left Z-shaped copper busbar corresponds to the left end of the straight copper busbar, and the right Z-shaped copper busbar corresponds to the right end of the straight copper busbar. A 3-5mm air gap is left between the lap joints of the Z-shaped copper busbar and the straight copper busbar. The a-phase lead copper busbar of the transformer's A-phase winding is bolted to the left Z-shaped copper busbar, the b-phase lead copper busbar of the B-phase winding is bolted to the straight copper busbar, and the c-phase lead copper busbar of the C-phase winding is bolted to the right Z-shaped copper busbar. During the test, the Z-shaped copper busbar and the straight copper busbar are connected together at the lap joint with bolts to create a short circuit in the three-phase leads of the transformer.

[0006] After the temperature rise stabilizes, remove the bolts at the joint of the auxiliary tooling, and use an epoxy resin board to separate the Z-shaped copper busbar and the straight copper busbar by inserting them into the air gap, thus separating the three-phase leads of the transformer.

[0007] In a further preferred embodiment, during the temperature rise test, the auxiliary tooling is pre-fixed to the three-phase lead copper busbars of the transformer body to short-circuit them; when the temperature rise test is stable, the bolts at the lap joint of the auxiliary tooling are quickly removed, and then the Z-shaped copper busbars and straight copper busbars are separated by epoxy resin boards, which can shorten the disconnection time of the three-phase lead copper busbars, facilitate the measurement of three-phase resistance, and improve the accuracy of the temperature rise test value.

[0008] In a further preferred embodiment, the lap joint of the auxiliary tooling is located inside the transformer tank near the door opening, which facilitates the quick removal of the bolts at the lap joint of the Z-shaped copper busbar and the straight copper busbar, thereby quickly breaking the short circuit of the three-phase lead copper busbar of the transformer.

[0009] The beneficial effects of this utility model are as follows: Practical experience has proven that the auxiliary fixture for temperature rise testing of outdoor containerized dry-type transformers can be pre-fixed to the three-phase copper busbars of the transformer body during the temperature rise test, causing a short circuit. Once the temperature rise test stabilizes, the disconnection time of the three-phase copper busbars can be shortened, facilitating the measurement of three-phase resistance and improving the accuracy of the temperature rise test values. Furthermore, the fixture's connector is located at the door opening of the enclosure, reducing the number and time required for disassembling the fixing bolts, facilitating quick disconnection, and improving the accuracy of the temperature rise test values. It can be applied to special tests in transformer manufacturing to complete the rapid short-circuit to disconnection test, and is suitable for temperature rise testing of outdoor containerized substations, large-capacity dry-type transformers in situations with limited operating space. Attached Figure Description

[0010] Figure 1 : Schematic diagram of auxiliary tooling structure. Figure 2 for Figure 1 A magnified view of a portion of the image. Figure 3 : Schematic diagram of the use and arrangement of auxiliary tooling on the transformer (top view of the transformer).

[0011] In the diagram, 1 is a straight copper busbar, 2 is a resin epoxy board, 3 is a Z-shaped copper busbar, 4 is an auxiliary tooling, 5 is the copper busbar for the first lead of phase a, 6 is the winding of phase A, 7 is the copper busbar for the first lead of phase b, 8 is the copper busbar for the first lead of phase c, 9 is the iron core, 10 is the winding of phase C, 11 is the clamp, and 12 is the winding of phase B. Detailed Implementation

[0012] The attached figure shows one embodiment of this utility model.

[0013] This utility model discloses an auxiliary tooling for testing the temperature rise of an outdoor containerized dry-type transformer, comprising a Z-shaped copper busbar 3, a straight copper busbar 1, and an epoxy resin board 2. The left Z-shaped copper busbar corresponds to the left end of the straight copper busbar, and the right Z-shaped copper busbar corresponds to the right end of the straight copper busbar. A 3-5mm air gap is left between the lap joints of the Z-shaped copper busbar and the straight copper busbar. The a-phase lead copper busbar 5 of the transformer's A-phase winding 6 is connected to the left Z-shaped copper busbar by bolts, the b-phase lead copper busbar 7 of the B-phase winding 12 is connected to the straight copper busbar by bolts, and the c-phase lead copper busbar 8 of the C-phase winding 10 is connected to the right Z-shaped copper busbar by bolts. During the test, the Z-shaped copper busbar and the straight copper busbar are connected together at the lap joints with bolts to create a short circuit in the three-phase leads of the transformer.

[0014] After the temperature rise stabilizes, remove the bolts at the joint of the auxiliary tooling, and use an epoxy resin board to separate the Z-shaped copper busbar and the straight copper busbar by inserting it into the air gap between them, so that the three-phase leads of the transformer are separated.

[0015] During the temperature rise test, the auxiliary tooling is pre-fixed to the three-phase lead copper busbars of the transformer body to short-circuit them. When the temperature rise test is stable, the bolts at the joint of the auxiliary tooling are quickly removed, and then the Z-shaped copper busbars and straight copper busbars are separated by epoxy resin boards. This can shorten the disconnection time of the three-phase lead copper busbars, facilitate the measurement of three-phase resistance, and improve the accuracy of the temperature rise test value.

[0016] The lap joint of this auxiliary tool is located inside the transformer tank near the door opening, which facilitates the quick removal of the bolts at the lap joint of the Z-type copper busbar and the straight copper busbar, thereby quickly breaking the short circuit of the three-phase lead copper busbar of the transformer.

[0017] The procedure is as follows: During the overall temperature rise test of the transformer, the low-voltage three-phase (a, b, c phases) windings need to be short-circuited together. This auxiliary fixture is pre-fixed to the three-phase lead copper busbars of the transformer body, and the Z-shaped copper busbars and straight copper busbars are connected together with bolts to create a short circuit in the transformer's three-phase leads. After the temperature rise stabilizes, the bolts at the connection points of the Z-shaped and straight copper busbars are quickly removed, and then an epoxy resin board is used to separate the Z-shaped and straight copper busbars, thus separating the transformer's three-phase leads.

[0018] A dry-type transformer includes a casing and a transformer body installed inside the casing. The transformer body includes an iron core 9 and three phase windings 6 (A-phase), 12 (B-phase), and 10 (C-phase) mounted on three iron core columns. Each phase winding includes a low-voltage winding and a high-voltage winding. The low-voltage winding is mounted on the iron core column, and the high-voltage winding is mounted outside the low-voltage winding. Clamps 11 are installed on both sides of the upper yoke of the iron core, and bolts are inserted to clamp the yoke. Clamps 11 are also installed on both sides of the lower yoke of the iron core, and bolts are inserted to clamp the yoke.

Claims

1. An outdoor container-type dry-type transformer temperature rise test auxiliary tool, characterized by: It includes Z-shaped copper busbars, straight copper busbars, and epoxy resin boards. The left Z-shaped copper busbar corresponds to the left end of the straight copper busbar, and the right Z-shaped copper busbar corresponds to the right end of the straight copper busbar. A 3-5mm air gap is left between the overlap joints of the Z-shaped copper busbars and the straight copper busbars. The a-phase lead copper busbar of the A-phase winding of the transformer is connected to the left Z-shaped copper busbar by bolts, the b-phase lead copper busbar of the B-phase winding is connected to the straight copper busbar by bolts, and the c-phase lead copper busbar of the C-phase winding is connected to the right Z-shaped copper busbar by bolts. During the test, the Z-shaped copper busbars and the straight copper busbars are connected together at the overlap joints with bolts to create a short circuit in the three-phase leads of the transformer. After the temperature rise stabilizes, remove the bolts at the joint of the auxiliary tooling, and use an epoxy resin board to separate the Z-shaped copper busbar and the straight copper busbar by inserting them into the air gap, thus separating the three-phase leads of the transformer.

2. The outdoor container-type dry-type transformer temperature rise test auxiliary tool according to claim 1, characterized in that: During the temperature rise test, the auxiliary tooling is pre-fixed to the three-phase lead copper busbars of the transformer body to short-circuit them. When the temperature rise test is stable, the bolts at the joint of the auxiliary tooling are quickly removed, and then the Z-shaped copper busbars and straight copper busbars are separated by epoxy resin boards. This can shorten the disconnection time of the three-phase lead copper busbars, facilitate the measurement of three-phase resistance, and improve the accuracy of the temperature rise test value.

3. The outdoor container-type dry-type transformer temperature rise test auxiliary tool according to claim 1, characterized in that: The lap joint of this auxiliary tool is located inside the transformer tank near the door opening, which facilitates the quick removal of the bolts at the lap joint of the Z-type copper busbar and the straight copper busbar, thereby quickly breaking the short circuit of the three-phase lead copper busbar of the transformer.

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