CN203535191U - Low-voltage and high-current rotating test rig - Google Patents

Abstract

The utility model provides a low-voltage and high-current rotating test device, which is characterized in that it comprises an anechoic chamber, a turntable is arranged in the anechoic chamber, an insulation test table is arranged on the turntable, a test object is arranged on the insulation test table, and a center of the turntable is arranged. There is a center hole of the turntable, and a copper bar is arranged in the center hole of the turntable. One end of the copper bar is connected to the power supply end of the power supply equipment, and the other end is connected to the tested product through a flexible connection line. The power supply equipment is located in the shielding room. The utility model adopts low-voltage and high-current power supply equipment placed underground on the turntable, and is connected with the test object through the controllable lifting of the copper row in the empty shaft area of the turntable. At the same time, the overall cost of the customized central hollow shaft turntable and copper bar is far less than the cost of the double-layer turntable, which has great advantages in manufacturing cost, and the maintenance of power supply equipment is also very convenient.

Description

Low-voltage and high-current rotating test device

technical field

The utility model relates to a low-voltage high-current rotating test device, which is used for radiation emission testing of low-voltage circuit breakers.

Background technique

The latest standards for the radiation emission test of universal circuit breakers are the national standard GB14048.2-2008 "Low-voltage switchgear and control equipment Part 2: Circuit breakers" and the international standard IEC60947-2: 2006+A1: 2009 "Low-voltage switchgear and controlgear-Part2: Circuit-breakers", clause F.5.4. The standard requires that when radiating radio frequency disturbance (30MHz~1GHz), the test layout should be carried out according to Figure 1.

Most testing agencies do not fully meet the standard requirements when conducting radiation emission tests on universal circuit breakers. Since the test product should be placed on the turntable, and the low-voltage and high-current power supply is obtained from the power supply device through the thick and flexible connecting wire, the turntable needs to be turned 360°, and the thick and flexible wiring is bound to be entangled, which is easy to short circuit, which will inevitably bring the test product How to place the large-sized power supply equipment when rotating. The current main solutions are: 1) Judging the maximum disturbance surface of the test product through experience, and directly facing the maximum radiation disturbance surface to the antenna for testing, that is, the test product and power supply equipment are fixed on the turntable without rotation. Disadvantages: only It is difficult to simulate the actual situation based on experience; 2) The test object and the power supply equipment are placed on the turntable at the same time, and the reflection effect caused by the power supply equipment is ignored, and the rotation test is carried out. The test data is inaccurate due to electromagnetic wave reflection; 3) The test product is placed on the turntable, the power supply equipment is placed outside the turntable, the soft connection part is extended as much as possible, and the turntable is rotated as much as possible under the premise of ensuring that the soft connection line is not entangled. Disadvantages : The thick and flexible wiring needs to be very long, and it is unrealistic to avoid intertwining when the turntable is reversing; 4) Using a double-layer turntable scheme, the test product is placed on the first turntable, and the power supply equipment is placed on the second turntable. Carrying out the rotation test together is a rare arrangement that fully meets the requirements of the standard test. However, the cost of the double-layer turntable is very high, and the maintenance of the power supply equipment is extremely difficult. At present, there is no such successful solution in China.

Contents of the invention

The purpose of this utility model is to provide a low-voltage high-current test device for radiation emission testing occasions, which is used for radiation disturbance testing of low-voltage high-current equipment such as universal circuit breakers. The cost realizes the configuration scheme that fully meets the test requirements of the standard GB14048.2-2008 and IEC60947-2: 2006+A1: 2009.

In order to achieve the above object, the utility model provides a low-voltage high-current rotary test device, which is characterized in that it includes an anechoic chamber, a turntable is arranged in the anechoic chamber, an insulation test table is arranged on the turntable, and the tested product is set on the insulation test table. Above, there is a center hole of the turntable in the center of the turntable, and a copper bar is set in the center hole of the turntable. One end of the copper bar is connected to the power supply end of the power supply equipment, and the other end is connected to the tested product through a flexible connection line. The power supply equipment is located in the shielding room.

Preferably, the power supply equipment is a low-voltage high-current power supply equipment.

Preferably, the flexible connecting wire is a copper braid.

Preferably, the anechoic chamber is further provided with a ground plane.

Preferably, the power supply device is located directly below the turntable.

Preferably, the shielding room is located underground.

Preferably, the copper bars have terminals of different sizes.

Preferably, the copper bar is connected to a lifting mechanism that can drive the copper bar to move up and down, and the lifting mechanism is driven by a motor 18 .

More preferably, the lifting mechanism is fixed on a triangular bracket, the triangular bracket is fixed on the inner side wall of the turntable base, the motor is fixed on the bracket, and the bracket is arranged in the shielding room.

Preferably, an interface board (CP board) is arranged in the center hole of the turntable, and a cover plate is arranged on the center hole of the turntable.

Compared with the prior art, the beneficial effects of the utility model are:

1. The low-voltage and high-current power supply equipment of the utility model is placed in the shielding room underground in the anechoic chamber, which avoids the influence of the power supply equipment on the radiation emission test;

2. The tested product of the utility model is connected to the underground power supply equipment through the copper braid and the copper bar. The copper bar is located at the center of the turntable, so the rotation of the turntable by plus or minus 180° will not cause winding, and the test layout fully meets the standard requirements;

3. The copper bar of the utility model can be lifted and lowered automatically. During the test, the copper bar can be raised to 40cm, and then connected to the test product via a relatively short copper braid, which greatly reduces the workload and connection burden of the test operator. The time spent on test layout is shortened; usually the lifting copper bar is lowered to the bottom of the interface plate in the center of the turntable, and then covered with a cover plate to form a complete simulated open field reflection surface, which meets the requirements of the standard site and does not affect the routine product test;

4. The high-current power supply equipment is placed directly under the turntable to realize the connection between the test product and the power supply equipment with the shortest distance, avoiding a large loss of electric energy and power;

5. Copper bars have terminal posts of different sizes, which is more convenient for the operability of different interfaces used by different products.

6. The liftable device of the utility model is covered with a cover plate of matching size when it is not in use, so as to prevent safety accidents caused by careless operation. And the device can be controlled remotely and monitored in real time. The tripping time of the immunity test brings great convenience.

7. Compared with the double-layer turntable scheme which is expensive and difficult to maintain for power supply equipment, the utility model greatly reduces the construction cost on the basis of meeting the standard test requirements. At the same time, the power supply equipment is placed in the underground shielding room, which is very convenient for maintenance.

Description of drawings

Figure 1 is an experimental diagram of radiated radio frequency disturbance;

Figure 2 is a schematic diagram of the structure of the low-voltage high-current rotating test device;

Fig. 3 is a structural schematic diagram of a turntable;

Figure 4 is a cross-sectional view of the copper bar.

Description of drawings:

1-Anechoic chamber, 2-Tested product, 3-Flexible connection line, 4-Insulation test table, 5-Copper bar, 6-Three-phase high-current power supply equipment, 7-Turntable, 8-Shielding room, 9-Grounding plate , 10-center hole of turntable, 11-bracket, 12-triangular bracket, 15-turntable base, 16-turntable main body, 17-copper bar, 18, motor, 21-receiving antenna, 22-antenna tower, 23-ground plane , 24-the product to be tested, 25-flexible connecting wire, 26-insulation bracket, 27-turntable, 28-absorbing material.

Detailed ways

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

Example

As shown in Figure 2, it is a schematic structural diagram of a low-voltage high-current rotary test device. The low-voltage high-current rotary test device includes an anechoic chamber 1, and the anechoic chamber 1 is provided with a grounding plate 9 and a turntable 7 embedded in the grounding plate 9. The turntable 7 is located on one side of the anechoic chamber 1, the turntable 7 is provided with an insulation test table 4, the tested product 2 is set on the insulation test table 4, the center of the turntable 7 is provided with a turntable center hole 10, and the turntable center hole 10 is provided with a copper One end of row 5 and copper row 5 is connected to the power supply end of low-voltage high-current power supply device 6 , and the other end is connected to the tested product 2 through flexible connection wire 3 . The shield room 8 is located underground. The flexible connecting wire 3 is a copper braid.

As shown in Figure 3, it is a schematic diagram of the turntable structure. The turntable 7 includes a turntable base 15. The central hole 10 of the turntable is located in the middle of the main body 16 of the turntable, and the central hole 10 of the turntable is provided with an interface board (that is, a steel plate with several connectors for cable connection), and the central hole of the turntable 10 is provided with cover plate (the steel plate that is covered on the turntable center hole).

As shown in FIG. 4 , it is a cross-sectional view of the copper bar. There are three copper bars in total, and the three copper bars 17 have binding posts of different sizes. The copper bar 17 is connected to the lifting mechanism, which is driven by the motor 18 to drive the copper bar 17 to move up and down. The lifting mechanism is fixed on the triangular bracket 12, the triangular bracket 12 is fixed on the inner wall of the turntable base 15, and the motor 18 is fixed on the bracket 11 Above, the bracket 11 is located in the shielding room 8, and the motor 18 is connected to the reducer.

The utility model optimizes the connection between the turntable in the anechoic chamber and the underground low-voltage and high-current power supply equipment. A cylindrical empty shaft area with a diameter of 50 cm is reserved in the center of the turntable, and a shielding room for low-voltage and high-current power supply equipment is arranged directly below the turntable. , the power supply end of the power supply equipment is connected to the copper bar that can be automatically lifted; when the radiation emission test of the circuit breaker is performed in the anechoic chamber, the lifting copper bar is controlled to rise to a place about 30-40 cm above the elevated floor of the darkroom, and the copper bar is connected with a copper braid And the tested product placed on the 0.8m high table, reserve a certain length to ensure that the rotation of the turntable can be controlled by plus or minus 180°; Below the interface board in the center, it does not affect the routine test.

Claims (10)

1. A low-voltage high-current rotary test device is characterized in that, comprising an anechoic chamber (1), the anechoic chamber (1) is provided with a turntable (7), and the turntable (7) is provided with an insulation test table (4), which is The test object (2) is set on the insulation test table (4), the center of the turntable (7) is provided with the center hole (10) of the turntable, the center hole (10) of the turntable is provided with a copper bar (5), and one end of the copper bar (5) The power supply end of the power supply equipment is connected, and the other end is connected to the tested product (2) through a flexible connection line (3), and the power supply equipment is arranged in the shielding room (8). 2. The low-voltage high-current rotating test device according to claim 1, characterized in that, the power supply equipment is a low-voltage high-current power supply equipment (6). 3. The low-voltage and high-current rotating test device according to claim 1, characterized in that, the flexible connecting wire (3) is a copper braid. 4. The low-voltage and high-current rotating test device according to claim 1, characterized in that, a grounding plate (9) is also provided in the anechoic chamber (1). 5. The low-voltage and high-current rotating test device according to claim 1, characterized in that, the power supply equipment is located directly below the turntable (7). 6. The low-voltage and high-current rotating test device according to claim 1, characterized in that, the shielding room (8) is located underground. 7. The low-voltage and high-current rotating test device according to claim 1, characterized in that, the copper bars (5) have terminals of different sizes. 8. The low-voltage high-current rotating test device as claimed in claim 1, characterized in that, the copper bar (17) is connected to a lifting mechanism that can drive the copper bar (17) to move up and down, and the lifting mechanism is controlled by a motor (18) drive. 9. The low-voltage and high-current rotating test device according to claim 8, wherein the lifting mechanism is fixed on the tripod (12), and the tripod (12) is fixed on the inner wall of the turntable base (15) , the motor (18) is fixed on the support (11), and the support (11) is located in the shielding room (8). 10. The low-voltage and high-current rotating test device according to claim 1, wherein an interface plate is arranged in the center hole of the turntable, and a cover plate is arranged on the center hole of the turntable.

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