CN218003609U - Cable withstand voltage and torsion test equipment - Google Patents

Abstract

The utility model discloses a withstand voltage of cable and torsion test equipment includes: the device comprises a rotary clamp and a rotary machine connected with the rotary clamp, wherein one end of a cable to be tested is clamped by the rotary clamp, and the rotary clamp and the rotary machine form a torsion assembly so as to perform torsion test on the cable to be tested; and the voltage source is connected with the other end of the cable to be tested so as to perform a voltage withstand test on the cable to be tested while performing a torsion test.

Description

A cable withstand voltage and torsion test equipment

technical field

The disclosure belongs to the technical field of wind power generation, and in particular relates to a cable withstand voltage and torsion test equipment.

Background technique

Wind power generation is a new type of energy generation technology that is developing rapidly at present, and it is of great significance for the control of atmospheric haze, the adjustment of energy structure and the transformation of economic development mode. Wind power torsional cables are different from traditional power cables with metal sheath structures. It adopts a three-phase cable and grounding core wire alternately arranged structure, which ensures good torsion resistance from the structure, but still requires materials with excellent mechanical properties. In terms of electrical performance, the voltage drop during operation is still at the position of the insulation layer. Therefore, the fault of the long-term running cable is usually prone to occur here. The performance of the main insulation material is one of the keys to determine the quality of the cable. As an important part connecting the tower and the generator, the wind power torsion cable needs to withstand the combined effects of electricity, heat and force field. At the same time, the development trend of higher voltage and higher power also puts forward higher requirements on the performance of the cable. Therefore, it is particularly important to detect the manufacturing level and operational reliability of wind power torsion cables.

Therefore, it is necessary to propose a cable withstand voltage and torsion test equipment to detect the withstand voltage and torsion performance of wind power torsion cables.

Utility model content

In view of the deficiencies in the prior art, the purpose of the present disclosure is to provide a cable withstand voltage and torsion test equipment, which can simultaneously detect the withstand voltage and torsion performance of wind power torsion cables.

To achieve the above purpose, the present disclosure provides the following technical solutions:

A cable withstand voltage and torsion test equipment, including:

A rotating fixture, a rotating machine connected to the rotating fixture, wherein one end of the cable to be tested is clamped by the rotating fixture, and the rotating fixture and the rotating machine form a torsion assembly to perform a torsion test on the cable to be tested;

A voltage source, the voltage source is connected to the other end of the cable to be tested, so that the withstand voltage test is performed on the cable to be tested while performing the torsion test.

Preferably, the rotary clamp includes an upper clamp body and a lower clamp body, the upper clamp body includes an upper clamp seat and an upper clamp block, the lower clamp body includes a lower clamp seat and a lower clamp block, and the upper clamp seat and the lower clamp seat pass through Bolted.

Preferably, the rotary machine adopts a servo motor.

Preferably, the voltage source includes a variable frequency power supply, the variable frequency power supply is connected to a protection resistor through a transformer, and the protection resistor is connected in parallel to a voltage divider; the voltage divider is electrically connected to an electrostatic voltmeter.

Preferably, the device further includes a temperature control device.

Preferably, the device further includes a fixing bracket.

Preferably, one end of the cable to be tested clamped by the rotating fixture is grounded after being clamped by the grounding fixture.

Compared with the prior art, the beneficial effects brought by the present disclosure are:

The disclosure can simultaneously detect the withstand voltage and torsion performance of the wind power torsion cable, can simulate the situation of the wind power torsion cable in the actual operating environment to the greatest extent, and improve the reliability of the cable withstand voltage and torsion detection results.

Description of drawings

Fig. 1 is a schematic structural diagram of a cable withstand voltage and torsion test equipment provided by an embodiment of the present disclosure;

Fig. 2 is the structural representation of the rotating fixture in the equipment shown in Fig. 1;

Fig. 3 is the schematic diagram of the circuit structure of the voltage source in the device shown in Fig. 1;

4 is a schematic structural view of a grounding fixture provided by another embodiment of the present disclosure;

The symbols in the accompanying drawings are explained as follows:

1. Rotary fixture (1-1, upper fixture seat; 1-2, upper clip block; 1-3, lower fixture seat; 1-4, lower clip block); 2. Voltage source; 3. Temperature control device ; 4, fixed bracket; 5, grounding clamp (5-1, upper deck; 5-2, lower deck; 5-3-1, first rotating shaft; 5-3-2, second rotating shaft; 5-4 -1, the first limit rod; 5-4-2, the second limit rod; 5-5-1, the first limit block; 5-5-2, the second limit block).

detailed description

Specific embodiments of the present disclosure will be described in detail below with reference to FIGS. 1 to 4 . Although specific embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". The following descriptions in the specification are preferred implementation modes for implementing the present disclosure, but the descriptions are for the purpose of the general principles of the specification, and are not intended to limit the scope of the present disclosure. The protection scope of the present disclosure should be determined by the appended claims.

In order to facilitate the understanding of the embodiments of the present disclosure, further explanations will be given below by taking specific embodiments as examples in conjunction with the accompanying drawings, and each drawing does not constitute a limitation to the embodiments of the present disclosure.

In one embodiment, as shown in FIG. 1 , the present disclosure provides a cable withstand voltage and torsion test equipment, including:

Rotary clamp 1, a rotary machine (not shown) connected with the rotary clamp 1, wherein one end of the cable to be tested is clamped by the rotary clamp 1, and the rotary clamp 1 and the rotary machine form a torsion assembly for the Test the cable for torsion test;

A voltage source 2, the voltage source 2 is connected to the other end of the cable to be tested, so that the withstand voltage test is performed on the cable to be tested while performing the torsion test.

The above-mentioned embodiments constitute the complete technical solution of the present disclosure. This embodiment can simultaneously carry out withstand voltage and torsion tests on wind power torsion cables, maximally simulating conditions of wind power torsion cables in an actual operating environment, and improving the reliability of cable withstand voltage and torsion detection results. In addition, this embodiment does not require an additional withstand voltage tester, and the voltage application and withstand voltage test on the cable can be completed at the same time only through the voltage source, which reduces the size and cost compared with the existing equipment.

In another embodiment, as shown in FIG. 2 , the rotary clamp 1 includes an upper clamp body and a lower clamp body, the upper clamp body includes an upper clamp seat 1-1 and an upper clamp block 1-2, and the lower clamp body includes a lower clamp body. The clamp seat 1-3 and the lower clip block 1-4, the upper clamp seat 1-1 and the lower clamp seat 1-3 are connected by bolts.

In this embodiment, the upper clip block and the lower clip block are respectively welded to the upper fixture seat and the lower fixture seat, and both adopt a triangular structure with an included angle of 120°. Compared with the arc-shaped clips often used in the prior art, this embodiment adopts a triangular design, which can well fit and clamp different types of cables, and the clamping is stable, and the cables are not easy to slip. In addition, the surfaces of the upper clip block and the lower clip block are provided with parallel tooth grooves with a pitch of 1mm, which can further enhance the clamping stability of the cable to be tested, making it difficult to slip between the cable and the fixture. It should be noted that the upper and lower fixture seats and the upper and lower clip blocks are made of carburized gear steel, wherein the hardness of the clip blocks is between 55HRC and 65HRC.

In another embodiment, the rotary machine adopts a servo motor.

In another embodiment, as shown in FIG. 3 , the voltage source 2 includes a variable frequency power supply, the variable frequency power supply is connected to a protection resistor through a transformer, and the protection resistor is connected in parallel to a voltage divider; the voltage divider is electrically connected to an electrostatic voltmeter.

In this embodiment, the variable frequency power supply can be used to output voltage with variable frequency; the transformer adopts a 330kV experimental transformer, which is used to amplify the amplitude of the voltage output by the variable frequency power supply, so as to ensure that the output terminal has sufficient voltage; the protection resistor is formed by a series resistor , to prevent damage to the power supply due to excessive current caused by a short circuit; the voltage divider is composed of a voltage dividing capacitor to ensure the stability of the electrostatic voltmeter during the withstand voltage test of the cable; the electrostatic voltmeter is used to test the cable sample in the The magnitude of the voltage across the torsion process.

In another embodiment, the device further includes a temperature control device 3 .

The temperature control device is a test device that provides a certain temperature environment for the cable sample during the test process with temperature requirements. In this embodiment, a common digital electronic temperature controller is used, and an NTC thermal sensor is used to generate an induced voltage and current, and then the temperature is controlled. Digital quantization control has the advantages of high precision and good sensitivity. The temperature control range of the thermostat is between -60°C and +60°C. Since the cable port will have certain contact with the experimental device and other components, there is usually a certain gap between the temperature and the cables at other positions. Therefore, in order to ensure the reliability of the experimental results, The location of the cable requires that the temperature difference should not exceed ±3°C, and the storage time should not be less than 24 hours.

In another embodiment, the device further includes a fixing bracket 4 .

In this embodiment, the fixing bracket is fixed on one side of the temperature control device to fix the end of the cable to be tested connected to the voltage source.

In another embodiment, as shown in FIG. 4 , one end of the cable to be tested clamped by the rotating clamp is grounded after being clamped by a grounding clamp 5 (not shown in FIG. 1 ).

In this embodiment, the grounding fixture includes an upper deck 5-1 and a lower deck 5-2, and the two sides of the upper deck 5-1 and the lower deck 5-2 pass through the first limit rod 5-4-1 It is connected with the second limiting rod 5-4-2, the first rotating shaft 5-3-1 is arranged in the first limiting rod 5-4-1, and the second rotating shaft 5-3-1 is arranged in the second limiting rod 5-4-2. The rotating shaft 5-3-2, the first limiting block 5-5-1 is arranged on the upper part of the first limiting rod, and the second limiting block 5-5-2 is arranged on the upper part of the second limiting rod.

Next, the working principle of the device described in the present disclosure will be further described.

First of all, place the cable sample to be tested completely in the temperature control device, and place it at the expected test temperature for no less than 24 hours to simulate the working conditions under real use. Then start the torsion test, the specific process is: fix one end of the cable sample with a length of about 12m on the rotating fixture, and fix the other end on the fixed bracket, and the height of the rotating fixture from the fixed bracket is about 7m ~ 9m. Then apply a test voltage at the voltage source terminal, the test capacity is 30-30000kVA, the test voltage is 1000kV or below, the frequency range is 20-300Hz, and the test voltage is adjusted within the allowable range according to the requirements. Rotate the jig by first twisting 1080° clockwise, then counterclockwise by the same angle to restore the sample to its original state, continue to twist 1080° counterclockwise and then clockwise by the same angle to restore the sample to its original state, this is a cycle. The rotation speed of the rotating fixture is generally 720°～1440°/min. If the user has no special requirements, a test of 10,000 cycles is recommended. During the entire torsion test process, the rotating machine can automatically record and control the number of rotations, the electrostatic voltmeter can test the test voltage in real time, the temperature control device can test the test temperature in real time, and record and save relevant data through the host computer.

The technical solutions provided by the present disclosure have been described in detail above in conjunction with specific embodiments. At the same time, the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present disclosure. For those of ordinary skill in the art, according to the disclosure Thoughts, there will be changes in specific implementation methods and application ranges. Therefore, the content of this specification should not be construed as limiting the present disclosure.

Claims (7)

1. A cable withstand voltage and torsion test apparatus includes:

the device comprises a rotary clamp and a rotary machine connected with the rotary clamp, wherein one end of a cable to be tested is clamped by the rotary clamp, and the rotary clamp and the rotary machine form a torsion assembly so as to perform torsion test on the cable to be tested;

and the voltage source is connected with the other end of the cable to be tested so as to carry out a withstand voltage test while carrying out a torsion test on the cable to be tested.

2. The apparatus of claim 1, wherein the rotary clamp comprises an upper clamp body and a lower clamp body, the upper clamp body comprises an upper clamp seat and an upper jaw block, the lower clamp body comprises a lower clamp seat and a lower jaw block, and the upper clamp seat and the lower clamp seat are connected through a bolt.

3. The apparatus of claim 1, wherein the rotary machine employs a servo motor.

4. The apparatus of claim 1, wherein the voltage source comprises a variable frequency power supply connected through a transformer to a protection resistor connected in parallel to a voltage divider; the voltage divider is electrically connected with the electrostatic voltmeter.

5. The apparatus of claim 1, wherein the apparatus further comprises a temperature control device.

6. The apparatus of claim 1, wherein the apparatus further comprises a stationary support.

7. The apparatus of claim 1, wherein one end of the cable under test held by the rotary clamp is held by the grounding clamp and then grounded.

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