Withstand voltage insulation test fixture for multi-winding transformer

Abstract

The utility model discloses a multi-winding transformer withstand voltage insulation test tool comprising an operation bench, a fixed seat arranged on the operation bench, an upper contact plate arranged right above the fixed seat, an installation plate arranged right above the upper contact plate, a linear execution mechanism fixed on the installation plate, and a guide column arranged between the installation plate and the operation bench. A row of spring probes are fixed to the bottom of the upper contact plate, the fixing base is composed of a fixing plate and a lower contact plate, a row of containing grooves are formed in the fixing plate, pin through holes are formed in the containing grooves, a plurality of conductive columns are arranged on the lower contact plate, a plurality of positioning guide sleeves are fixed to the operation table, springs are arranged in the positioning guide sleeves, and the spring probes are arranged on the springs. The lower contact plate is sleeved on the positioning guide sleeves, a plurality of guide columns corresponding to the positioning guide sleeves are fixed at the bottom of the fixing plate, the upper contact plate is provided with a leading-out wire I, and the lower contact plate is provided with a plurality of leading-out wires II. Compared with the prior art, the voltage-withstanding insulation test efficiency of the multi-winding transformer can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to transformer testing equipment, in particular to a withstand voltage insulation testing fixture for a multi-winding transformer. Background Art

[0002] A multi-winding transformer is a special type of transformer, which is characterized by having more than two windings on the secondary side or more than two windings on both the primary and secondary sides. It uses electromagnetic induction to achieve the transmission and transformation of electric energy, and is widely used in power systems, power substations, electronic equipment, etc. Multi-winding transformers need to undergo a withstand voltage insulation test before leaving the factory. The test aims to apply a certain voltage to the magnetic core and each winding to test whether it can withstand the voltage and maintain its insulation performance unchanged, thereby determining whether there are any defects.

[0003] At present, the commonly used tool for the withstand voltage insulation test of multi-winding transformers is the withstand voltage tester. During the test, the high-voltage terminal contacts of the withstand voltage tester are distributed to contact the magnetic core and each winding pin, and high voltage is applied to them for a certain period of time to detect their withstand voltage insulation performance. Since the pin spacing between the windings of a multi-winding transformer is not very large, the high-voltage terminal contacts of the withstand voltage tester are more troublesome to connect with the pins, and it takes more time, resulting in a slow withstand voltage insulation test efficiency. Utility Model Content

[0004] The utility model aims to overcome the problem of low efficiency of the existing multi-winding transformer withstand voltage insulation test and provide a test fixture that can effectively improve the efficiency of the multi-winding transformer withstand voltage insulation test.

[0005] The utility model solves the technical problem by adopting a technical solution: a multi-winding transformer withstand voltage insulation test fixture, including an operating table, a fixed seat is provided on the operating table, an upper contact plate is provided directly above the fixed seat, a mounting plate is provided directly above the upper contact plate, the upper contact plate is fixedly connected to the mounting plate, a linear actuator is fixed on the mounting plate, the linear actuator is suspended above the mounting plate through a frame, a guide column is provided between the mounting plate and the operating table, the mounting plate is sleeved on the guide column, the linear actuator drives the mounting plate to perform vertical linear reciprocating motion along the guide column, a row of spring probes is fixed at the bottom of the upper contact plate, the fixed seat is composed of a fixed plate and a lower contact plate, the lower contact plate is located directly below the fixed plate, A row of placement slots is provided on the fixed plate, and pin through holes are provided in the placement slots. The pin through holes of the placement slots match the pins of the transformer, and the spring probes correspond to the placement slots. A plurality of conductive columns are provided on the lower contact plate, and the conductive columns correspond to the pin through holes one by one. Several positioning guide sleeves are fixed on the operating table, and springs are provided in the positioning guide sleeves. The lower contact plate is sleeved on the positioning guide sleeves, and several guide columns corresponding to the positioning guide sleeves are fixed at the bottom of the fixed plate, and the guide columns are inserted into the positioning guide sleeves. A lead wire I is provided on the upper contact plate, and the lead wire I is connected in series with the spring probes. Several lead wires II are provided on the lower contact plate, and each column of the conductive columns below the placement slots is connected in series with a lead wire II, and the corresponding columns of the conductive columns below each placement slot are connected in series.

[0006] Optionally, the operating table is a box body.

[0007] Optionally, the linear actuator is composed of an air pump and a pneumatic push rod, and a control button of the pneumatic push rod is integrated on the operating table.

[0008] Optionally, a guide plate is provided directly below the upper contact plate, the spring probe passes through the guide plate, and the guide plate is fixed to the upper contact plate via a bracket.

[0009] Optionally, the mounting plate is provided with an adjustment through hole, the upper contact plate moves forward and backward along the adjustment through hole at the bottom of the mounting plate, and the mounting plate is fixedly connected to the upper contact plate by bolts and nuts.

[0010] The use method and principle of the utility model are as follows: when in use, a corresponding fixing seat is selected according to the model of the multi-winding transformer, lead wires I and II are connected to the withstand voltage tester, the multi-winding transformer to be tested is placed in the placement slot, the pins of the multi-winding transformer are inserted into the pin through holes, the upper contact plate is moved downward by a linear actuator, and the spring probe at the bottom of the upper contact plate contacts the magnetic core of the multi-winding transformer during the downward movement, and a downward pressure is applied to the multi-winding transformer, the multi-winding transformer drives the fixing plate to move downward, and the pins of the multi-winding transformer contact the conductive columns on the lower contact plate, at which time, the magnetic core of the multi-winding transformer and each winding are connected to the withstand voltage tester at the same time, and the withstand voltage tester applies a pressure to it. The high voltage is applied for a certain period of time to perform a withstand voltage insulation test. After the test is completed, the upper contact plate is moved upward by the linear actuator, and the spring probe at the bottom of the upper contact plate leaves the magnetic core of the multi-winding transformer. The fixed plate returns to its original position under the action of the guide column and the spring, and the pins of the multi-winding transformer are disconnected from the conductive column on the lower contact plate, and the withstand voltage insulation test of the next multi-winding transformer is performed. During the test, multiple multi-winding transformers can be put in for testing together. At this time, only the withstand voltage insulation performance of the corresponding windings of multiple multi-winding transformers can be detected. When the test fails, it can only be determined which winding of the multi-winding transformer has a problem, but it cannot be determined which multi-winding transformer it is. When this happens, it needs to be tested separately.

[0011] In the utility model, the withstand voltage tester is connected and disconnected with the magnetic core and pins of the multi-winding transformer through the spring probe and the conductive column, and can quickly perform the withstand voltage insulation test of the multi-winding transformer, thereby improving the test efficiency.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model can effectively improve the efficiency of the withstand voltage insulation test of a multi-winding transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a side view of the structure of the utility model;

[0014] The components described in the accompanying drawings are marked as follows: operating table 1, upper contact plate 2, mounting plate 3, linear actuator 4, guide column 5, spring probe 6, fixing plate 7, lower contact plate 8, placement slot 9, pin through hole 10, conductive column 11, positioning guide sleeve 12, guide column 13, lead wire I 14, lead wire II 15, control button 16, guide plate 17, adjustment through hole 18, bolt 19, nut 20. DETAILED DESCRIPTION

[0015] Embodiment 1, below combines Figure 1To further illustrate the utility model, a multi-winding transformer withstand voltage insulation test fixture includes an operating table 1, a fixed seat is provided on the operating table, an upper contact plate 2 is provided directly above the fixed seat, the upper contact plate is rectangular, a mounting plate 3 is provided directly above the upper contact plate, the mounting plate is rectangular, the upper contact plate is fixedly connected to the mounting plate by screws, a linear actuator 4 is fixed on the mounting plate, the linear actuator is suspended above the mounting plate through a frame, a guide column 5 is provided between the mounting plate and the operating table, the guide column is perpendicular to the mounting plate and the operating table, one end of the guide column is fixed to the operating table, the mounting plate is sleeved on the guide column, the linear actuator drives the mounting plate to perform vertical linear reciprocating motion along the guide column, a row of spring probes 6 are fixed to the bottom of the upper contact plate, one end of the spring probes is vertically fixed to the bottom of the upper contact plate, the spring probes are arranged at intervals, and the fixed seat is composed of a fixed plate 7 and a lower contact plate 8 The fixed plate and the lower contact plate are rectangular. The lower contact plate is located directly below the fixed plate. A row of placement slots 9 are provided on the fixed plate. Pin through holes 10 are provided in the placement slots. The pin through holes of the placement slots match the pins of the transformer. The spring probes correspond to the placement slots. A plurality of conductive columns 11 are vertically fixed on the lower contact plate. The conductive columns correspond to the pin through holes one by one. Several positioning guide sleeves 12 are fixed on the operating table. Springs are provided in the positioning guide sleeves. The lower contact plate is sleeved on the positioning guide sleeves. The lower contact plate is fixedly connected to the operating table by screws. Several guide columns 13 corresponding to the positioning guide sleeves are vertically fixed at the bottom of the fixed plate. The guide columns are inserted into the positioning guide sleeves. A lead wire Ⅰ14 is provided on the upper contact plate. The lead wire Ⅰ is connected in series with the spring probe. The lower contact plate is provided with several lead wires Ⅱ15. Each column of the conductive columns below the placement slots is connected in series with a lead wire Ⅱ. The corresponding columns of the conductive columns below each placement slot are connected in series.

[0016] Optionally, in order to facilitate wiring and accommodate some components, the operating table adopts a box body.

[0017] Optionally, in order to facilitate the control of the linear actuator, the linear actuator adopts a pneumatic mechanism, which is composed of an air pump and a pneumatic push rod, and the control button 16 of the pneumatic push rod is integrated on the operating table.

[0018] Optionally, in order to better support the spring probe and keep it vertical, a guide plate 17 is provided directly below the upper contact plate, and the spring probe passes through the guide plate, which is fixed to the upper contact plate via a bracket.

[0019] Optionally, in order to make the spring probe of the upper contact plate compatible with more models of multi-winding transformers, an adjustment hole 18 is provided on the mounting plate, and the upper contact plate moves back and forth along the adjustment hole at the bottom of the mounting plate. The mounting plate is fixedly connected to the upper contact plate by bolts 19 and nuts 20.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-winding transformer withstand voltage insulation test fixture, comprising an operating table (1), a fixed seat is provided on the operating table, an upper contact plate (2) is provided directly above the fixed seat, a mounting plate (3) is provided directly above the upper contact plate, the upper contact plate is fixedly connected to the mounting plate, a linear actuator (4) is fixed on the mounting plate, the linear actuator is suspended above the mounting plate through a frame, a guide column (5) is provided between the mounting plate and the operating table, the mounting plate is sleeved on the guide column, and the linear actuator drives the mounting plate to perform vertical linear reciprocating motion along the guide column, characterized in that: A row of spring probes (6) is fixed at the bottom of the upper contact plate. The fixing seat is composed of a fixing plate (7) and a lower contact plate (8). The lower contact plate is located directly below the fixing plate. A row of placement grooves (9) is provided on the fixing plate. The placement grooves are provided with pin through holes (10). The pin through holes of the placement grooves match the pins of the transformer. The spring probes correspond to the placement grooves. A plurality of conductive pillars (11) are provided on the lower contact plate. The conductive pillars correspond to the pin through holes one by one. A plurality of positioning guide sleeves (12) are fixed on the operating table. The positioning guide sleeves are provided with springs. The lower contact plate is sleeved on the positioning guide sleeves. A plurality of guide pillars (13) corresponding to the positioning guide sleeves are fixed at the bottom of the fixing plate. The guide pillars are inserted into the positioning guide sleeves. The upper contact plate is provided with a lead wire I (14). The lead wire I is connected in series with the spring probes. The lower contact plate is provided with a plurality of lead wires II (15). Each column of conductive pillars below the placement grooves is connected in series with a lead wire II. The corresponding column of conductive pillars below each placement groove is connected in series.

2. The multi-winding transformer withstand voltage insulation test fixture according to claim 1, characterized in that: The operating table is a box body.

3. The multi-winding transformer withstand voltage insulation test fixture according to claim 1, characterized in that: The linear actuator is composed of an air pump and a pneumatic push rod, and the control button (16) of the pneumatic push rod is integrated on the operating table.

4. The multi-winding transformer withstand voltage insulation test fixture according to claim 1, characterized in that: A guide plate (17) is provided directly below the upper contact plate, the spring probe passes through the guide plate, and the guide plate is fixed to the upper contact plate via a bracket.

5. The multi-winding transformer withstand voltage insulation test fixture according to claim 1, characterized in that: An adjustment through hole (18) is provided on the mounting plate, and the upper contact plate moves forward and backward along the adjustment through hole at the bottom of the mounting plate. The mounting plate is fixedly connected to the upper contact plate via bolts (19) and nuts (20).

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