CVT temperature rise test platform

Abstract

The invention provides a CVT temperature rise test platform which comprises a mutual inductor tester, a load box, a transformation unit and a switching controller, a coil of a tested CVT and a load on the load box form a test loop which is connected to the mutual inductor tester, and a relay contact switch and a contactor which are controlled by the switching controller are arranged in the test loop to control on-off. According to the CVT temperature rise test platform provided by the invention, a temperature rise test can be carried out on the CVT, a plurality of loads with different resistance values can be provided at the same time through the design of the load box structure, and the load box can achieve a good heat dissipation effect, so that the normal proceeding of the temperature rise test is ensured; and the switching controller realizes the circuit control of the tested CVT in a remote control manner, when the CVT is provided with a plurality of coils, the tested coils and the load do not need to be replaced by manual operation, and the switching of the coils and the load can be completed only by controlling the contact switch through the switching controller, so that the efficiency is improved, and the safety of operators is ensured.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a CVT temperature rise test platform. Background Technology

[0002] Temperature rise testing is a crucial test item for CVT (Capacitor Voltage Transformer) products. It determines temperature rise by measuring the resistance of the winding coils in both cold and hot states. The main checks include the CVT's structural performance, top oil temperature rise, winding temperature rise limits, and whether the heat generated during operation can be dissipated quickly enough, as well as whether other components are overheating. Because CVT temperature rise testing requires a load test, and the resistance values ​​vary depending on the number of secondary windings and the load specifications, the secondary winding load connection resistance is constructed using resistance wire winding and a mesh hollow brick as insulation. Before each temperature rise test, the resistance value is wound according to the winding load specifications. Different resistance values ​​require different winding wire lengths and number of turns, which is time-consuming and labor-intensive. The resulting resistance values ​​are unstable, with large data deviations, low operating efficiency, uneven heating, and easy breakage, posing safety hazards. Prolonged continuous energization can cause the resistance wire to overheat and melt, leading to short circuits and hindering test completion, ultimately resulting in unstable test data.

[0003] When performing temperature rise tests on multi-coil CVTs, after testing one coil, it's necessary to switch to test other coils. Since different coils require different loads for testing, the load also needs to be switched when switching coils. However, these tests are usually performed manually, which is not only inefficient but also requires disconnecting the circuit and reconnecting the load, posing safety hazards. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a CVT temperature rise test platform to solve the problem that existing CVTs use multiple dispersed loads when conducting temperature rise tests, and each load is wound separately according to the coil.

[0005] To solve the above-mentioned technical problems, the present invention provides a CVT temperature rise test platform, including a current transformer tester, a load box, a transformer unit and a switching controller. The coil of the CVT under test and the load on the load box form a test circuit connected to the current transformer tester. The test circuit is equipped with a relay contact switch controlled by the switching controller and a contactor to control the on and off states.

[0006] The CVT under test has two or more coils. The switching controller remotely controls the relay to open and close the relay contact switch via the button controller. The switching controller also controls the contactor to open and close the contactor switch via the button controller.

[0007] The switching controller includes a main control circuit controlled by the main control switch K, a first control branch controlled by push-button controllers SB3-SB6 controlling relay contact switches K1-K4, a second control branch controlled by push-button controllers SB7-SB10 controlling contactors KM1-KM4, and a third control branch controlled by push-button controllers SB11-SB12 controlling contactor KM5; contactors KM1-KM5 control contactor switches KM1-KM5; The first control branch, the second control branch, and the third control branch are connected in parallel in the control loop.

[0008] The main control circuit includes relay K controlled by push-button controllers SB1-SB2, wherein push-button controllers SB1, SB2 and relay K are connected in series.

[0009] In the first control branch, the push-button controllers SB3-SB6 adopt a series structure in an open state, and the relays K1-K4 that they control are connected in parallel.

[0010] The load box includes a heat-conducting bracket (10), an insulating adjustment plate (30), a collecting wire (40), and several aluminum-cased resistors (20), at least two of the aluminum-cased resistors (20) having different resistance values; the aluminum-cased resistors (20) are fixedly mounted on the surface of the heat-conducting bracket (10) and arranged side by side in an exposed manner; the insulating adjustment plate (30) is connected to the heat-conducting bracket (10), and the insulating adjustment plate (30) has a corresponding resistance adjustment head (31) for each terminal of the aluminum-cased resistor (20); the terminals of the aluminum-cased resistors (20) are connected to the corresponding resistance adjustment head (31) through flame-retardant connecting cables (33); the resistance adjustment heads (31) are connected to each other through several resistance adjustment lines (32), so that some or all of the aluminum-cased resistors (20) form a series circuit, a parallel circuit, or a series-parallel hybrid circuit; the insulating adjustment plate (30) is also connected to the CVT to be tested via the collecting wire (40).

[0011] The multiple aluminum-cased resistors (20) on the load box are connected in series and / or in parallel to form multiple loads.

[0012] The resistance adjustment head (31) includes a positive resistance adjustment head and a negative resistance adjustment head, which are connected to the positive and negative terminals of the corresponding aluminum shell resistor (20).

[0013] Near the position of the resistance adjustment head (31) on the insulating adjustment plate (30), there is a number and / or resistance value of an aluminum shell resistor (20) connected thereto.

[0014] The heat-conducting bracket (10) is a U-shaped or V-shaped panel to form an open side, which serves as a heat dissipation port; at least three aluminum shell resistors (20) are provided on each panel of the heat-conducting bracket (10), and the resistance values ​​of the three aluminum shell resistors (20) are different.

[0015] The insulating adjustment plate (30) is square and horizontally arranged, and the resistance adjustment heads (31) are arranged in a matrix on the insulating adjustment plate (30).

[0016] The insulating adjustment plate (30) and the heat-conducting bracket (10) are connected by a support connecting plate (50) so that an installation gap is formed between the insulating adjustment plate (30) and the heat-conducting bracket (10).

[0017] The supporting connecting plate (50) is an inverted L-shaped structure.

[0018] The CVT temperature rise test platform provided by this invention can perform temperature rise tests on CVTs. Through the design of the load box structure, multiple loads with different resistance values ​​can be provided simultaneously, and the load box can achieve good heat dissipation, ensuring the normal conduction of the temperature rise test. The switching controller realizes circuit control of the CVT under test through remote control. When the CVT has multiple coils, there is no need for manual operation to change the coils under test and the loads. The switching of coils and loads can be completed simply by controlling the contact switch through the switching controller, thereby improving efficiency and ensuring the safety of operators.

[0019] Suitable aluminum-shell resistors are installed on the side of the heat-conducting bracket in the load box. The terminals of the aluminum-shell resistors are connected to the resistance adjustment heads of the insulating adjustment plate through flame-retardant connecting cables. Each resistance adjustment head is connected to only one terminal of the aluminum-shell resistor. The resistance adjustment heads are connected to each other through resistance adjustment lines according to the needs of the circuit composition, forming a series, parallel, or series-parallel mixed circuit. The required resistance value can be obtained by adjusting the connection method of the insulating plate terminals (series or parallel) according to the load size. Due to the characteristics of high power, strong current carrying capacity, and uniform heat dissipation, the resistor can be continuously energized and operated, making its temperature rise test values ​​more reliable and ensuring the safe operation of the product. The device has a simple structure and is easy for personnel to maintain later. Attached Figure Description

[0020] Figure 1 This is a perspective view of the load cell according to an embodiment of the present invention.

[0021] Figure 2 This is a circuit control diagram according to an embodiment of the present invention.

[0022] Figure 3 This is a circuit connection diagram of an embodiment of the present invention.

[0023] In the picture: 10-Heat-conducting bracket; 20 - Aluminum-cased resistor; 21 - First aluminum-cased resistor; 22 - Second aluminum-cased resistor; 23 - Third aluminum-cased resistor; 30 - Insulation adjustment plate; 31 - Resistance adjustment head; 32 - Resistance adjustment wire; 33 - Flame-retardant connecting cable; 40 - Converging wire; 50 - Support connecting plate. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Example like Figure 2-3 As shown, the present invention provides a CVT temperature rise test platform, including a current transformer tester, a load box, a transformer unit and a switching controller. The coil of the CVT under test and the load on the load box form a test circuit connected to the current transformer tester. The test circuit is equipped with a relay contact switch controlled by the switching controller and a contactor to control the on and off states.

[0028] The CVT under test has two or more coils. The switching controller remotely controls the relay to open and close the relay contact switch via the button controller. The switching controller also controls the contactor to open and close the contactor switch via the button controller.

[0029] The switching controller includes a main control circuit controlled by the main control switch K, a first control branch controlled by push-button controllers SB3-SB6 controlling relay contact switches K1-K4, a second control branch controlled by push-button controllers SB7-SB10 controlling contactors KM1-KM4, and a third control branch controlled by push-button controllers SB11-SB12 controlling contactor KM5; contactors KM1-KM5 control contactor switches KM1-KM5; The first control branch, the second control branch, and the third control branch are connected in parallel in the control loop.

[0030] The main control circuit includes relay K controlled by push-button controllers SB1-SB2, wherein push-button controllers SB1, SB2 and relay K are connected in series.

[0031] In the first control branch, the push-button controllers SB3-SB6 adopt a series structure in an open state, and the relays K1-K4 that they control are connected in parallel.

[0032] See Figure 1 This invention provides a load box, including a heat-conducting bracket 10, an insulating adjusting plate 30, a collecting wire 40, and a plurality of aluminum-cased resistors 20. At least two of the aluminum-cased resistors 20 have different resistance values. The plurality of aluminum-cased resistors 20 are connected to the heat-conducting bracket 10 in a side-by-side, spaced-apart arrangement, with the positive and negative terminals of the aluminum-cased resistors 20 facing upwards. The heat-conducting bracket 10 has a panel structure and a support base at the bottom for mounting on the ground or platform. The aluminum-cased resistors 20 are fixedly mounted on the surface of the heat-conducting bracket 10. The components are arranged side-by-side in an exposed manner; the insulating adjustment plate 30 is connected to the heat-conducting bracket 10, and the insulating adjustment plate 30 has a corresponding resistance adjustment head 31 for each terminal of the aluminum shell resistor 20; the terminals of the aluminum shell resistor 20 are connected to the corresponding resistance adjustment head 31 through flame-retardant connecting cables 33; the resistance adjustment heads 31 are connected to each other through several resistance adjustment lines 32, so that some or all of the aluminum shell resistors 20 form a series circuit, a parallel circuit, or a series-parallel hybrid circuit; the insulating adjustment plate 30 is also connected to the CVT to be tested via a collecting wire 40.

[0033] The resistance adjustment head 31 includes a positive resistance adjustment head and a negative resistance adjustment head, which are connected to the positive and negative terminals of the corresponding aluminum-cased resistor 20. The positive resistance adjustment head is connected to the positive terminal one by one, and the negative resistance adjustment head is connected to the negative terminal one by one. The resistance adjustment head 31 can lock the tissue adjustment line in place, thus ensuring circuit continuity.

[0034] Near the position of the resistance adjustment head 31 on the insulating adjustment plate 30, there are numbers and / or resistance values ​​of aluminum shell resistors 20 connected thereto. Correspondingly, the positive and negative terminals can also be distinguished by color.

[0035] The heat-conducting bracket 10 has a U-shaped or V-shaped panel to form an open side, which serves as a heat dissipation vent; at least three aluminum-cased resistors 20 are provided on each panel of the heat-conducting bracket 10. The open shape design facilitates the dissipation of heat generated by the aluminum-cased resistors 20.

[0036] The insulating adjustment plate 30 is square and horizontally arranged, and the resistance adjustment heads 31 are arranged in a matrix on the insulating adjustment plate 30. The size of the insulating adjustment plate 30 is adapted to the cross-sectional shape of the heat-conducting bracket 10, or the size of the insulating adjustment plate 30 is slightly larger than the cross-section of the heat-conducting bracket 10.

[0037] The insulating adjustment plate 30 and the heat-conducting bracket 10 are connected by a support connecting plate 50, so that an installation gap is formed between the insulating adjustment plate 30 and the heat-conducting bracket 10.

[0038] The supporting connecting plate 50 is an inverted L-shaped structure, used to support the lower part of the insulating adjusting plate 30 to fix the insulating adjusting plate 30.

[0039] The CVT temperature rise test load box provided by this invention features a suitable aluminum-shell resistor mounted on the side of a heat-conducting bracket. The terminals of the aluminum-shell resistor are connected to the resistance adjustment heads of an insulating adjustment plate via flame-retardant connecting cables. Each resistance adjustment head is connected to only one terminal of the aluminum-shell resistor. The resistance adjustment heads are connected to each other via resistance adjustment lines according to the circuit configuration requirements, forming a series, parallel, or mixed series-parallel circuit. The required resistance value can be obtained by adjusting the connection method of the insulating plate terminals in series or parallel according to the load size. Due to the characteristics of high resistor power, strong current carrying capacity, and uniform heat dissipation, the resistor can be continuously energized, making its temperature rise test values ​​more reliable and ensuring the safe operation of the product. The device has a simple structure and is easy for personnel to maintain later. The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A CVT temperature rise test platform, characterized in that, The CVT under test has two or more coils, the switching controller controls the opening and closing of the relay contact switch through the remote control of the button controller, and the switching controller also controls the opening and closing of the contactor switch through the button controller.

2. The CVT temperature rise test platform of claim 1, wherein, The switching controller includes a main control circuit controlled by a main control switch K, a first control branch of the relay contact switches K1-K4 of the relays K1-K4 controlled by the button controllers SB3-SB6, a second control branch of the contactors KM1-KM4 controlled by the button controllers SB7-SB10, and a third control branch of the contactor KM5 controlled by the button controllers SB11-SB12; and the contactors KM1-KM5 control the contactor switches KM1-KM5.

3. The CVT temperature rise test platform of claim 2, wherein, The first control branch, the second control branch and the third control branch are connected in parallel in the control circuit. The main control circuit includes a relay K controlled by the button controllers SB1-SB2, wherein the button controller SB1, the button controller SB2 and the relay K are connected in series.

4. The CVT temperature rise test platform of claim 3, wherein, The button controllers SB3-SB6 in the first control branch are connected in series in an open state, and the relays K1-K4 controlled by the button controllers SB3-SB6 are connected in parallel.

5. The CVT temperature rise test platform of claim 3, wherein, The load box includes a heat-conducting bracket (10), an insulating adjusting plate (30), a collection lead (40) and a plurality of aluminum shell resistors (20), at least two of the plurality of aluminum shell resistors (20) have different resistance values; the aluminum shell resistors (20) are fixedly installed on the surface of the heat-conducting bracket (10) and are arranged side by side in an exposed manner; the insulating adjusting plate (30) is connected to the heat-conducting bracket (10), and the insulating adjusting plate (30) is provided with a one-to-one corresponding resistance adjusting head (31) for each connection end of the aluminum shell resistor (20); the connection end of the aluminum shell resistor (20) is connected to the corresponding resistance adjusting head (31) through a flame-retardant connecting cable (33); the resistance adjusting heads (31) are connected through a plurality of resistance adjusting lines (32), so that part or all of the aluminum shell resistors (20) form a series circuit, a parallel circuit or a series-parallel hybrid circuit; the insulating adjusting plate (30) is also connected to the collection lead (40) and the CVT to be tested.

6. The CVT temperature rise test platform of claim 1, wherein, The plurality of aluminum shell resistors (20) on the load box form a plurality of loads in series and / or parallel.

7. The CVT temperature rise test platform of claim 6, wherein, The resistance adjusting head (31) includes a positive resistance adjusting head and a negative resistance adjusting head, and is connected to the positive connection end and the negative connection end of the corresponding aluminum shell resistor (20).

8. The CVT temperature rise test platform of claim 7, wherein, Near the position of the resistance adjusting head (31) on the insulating adjusting plate (30), the number and / or resistance value of the aluminum shell resistor (20) connected thereto are arranged.

9. The CVT temperature rise test platform of claim 6, wherein, ​ 10. The CVT temperature rise test platform of claim 6, wherein, The heat-conducting bracket (10) is a panel in U or V shape to form an open side as a heat dissipation opening; at least three aluminum shell resistors (20) are arranged on each panel of the heat-conducting bracket (10), and the resistances of the three aluminum shell resistors (20) are different; The insulation adjusting plate (30) is square and horizontally arranged, and the resistance adjusting heads (31) are arranged on the insulation adjusting plate (30) in a matrix manner; The insulation adjusting plate (30) and the heat-conducting bracket (10) are connected through the support connecting plate (50) to form a mounting gap between the insulation adjusting plate (30) and the heat-conducting bracket (10); The support connecting plate (50) is in an inverted L-shaped structure.

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