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

Cable withstand voltage and torsion test equipment

Technical Field

The utility model belongs to the technical field of wind power generation, concretely relates to withstand voltage of cable and torsion test equipment.

Background

Wind power generation is a novel energy power generation technology which is developed rapidly at present, and has important significance for atmospheric haze treatment, energy structure adjustment and economic development mode conversion. The wind power torsion cable is different from the traditional power cable with a metal sheath structure, adopts a structure that core wires of a three-phase cable and a grounding wire are alternately arranged, structurally ensures good torsion resistance, and still needs a material with excellent mechanical property. In terms of electrical properties, the voltage drop during operation is still at the location of the insulation layer, and therefore, long-run cables are often prone to failure, as well, where the properties of the primary insulation are one of the keys in determining the quality of the cable. The wind power torsion cable is used as an important part for connecting a tower and a generator, needs to bear the comprehensive action of electricity, heat and a force field, and simultaneously, the development trend of higher voltage and higher power also puts higher requirements on the performance of the cable. Therefore, the method is particularly important for detecting the manufacturing level and the operation reliability of the wind power torsion cable.

Therefore, it is necessary to provide a cable voltage resistance and torsion test device for detecting the voltage resistance and torsion performance of the wind power torsion cable.

SUMMERY OF THE UTILITY MODEL

To the not enough among the prior art, this disclosed aim at provides a withstand voltage of cable and twists reverse test equipment, and the device can carry out withstand voltage and twist reverse performance detection simultaneously to wind-powered electricity generation torsion cable.

In order to achieve the above purpose, the present disclosure provides the following technical solutions:

a cable withstand voltage and torsion test apparatus comprising:

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.

Preferably, the rotary fixture comprises an upper fixture body and a lower fixture body, the upper fixture body comprises an upper fixture seat and an upper clamping piece, the lower fixture body comprises a lower fixture seat and a lower clamping piece, and the upper fixture seat is connected with the lower fixture seat through a bolt.

Preferably, the rotating machine is a servo motor.

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

Preferably, the apparatus further comprises a temperature control device.

Preferably, the apparatus further comprises a fixing bracket.

Preferably, one end of the cable to be tested clamped by the rotary clamp is clamped by the grounding clamp and then grounded.

Compared with the prior art, the beneficial effect that this disclosure brought does:

the method can be used for simultaneously detecting the pressure resistance and the torsion performance of the wind power torsion cable, can simulate the condition of the wind power torsion cable in an actual operation environment to the maximum extent, and improves the reliability of the pressure resistance and torsion detection result of the cable.

Drawings

Fig. 1 is a schematic structural diagram of a cable withstand voltage and torsion test apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of a rotating jig in the apparatus shown in FIG. 1;

FIG. 3 is a schematic diagram of the circuit configuration of the voltage source in the apparatus of FIG. 1;

fig. 4 is a schematic structural view of a grounding clamp provided in another embodiment of the present disclosure;

the reference symbols in the drawings are as follows:

1. a rotary clamp (1-1, an upper clamp seat, 1-2, an upper clamping piece, 1-3, a lower clamp seat, 1-4, a lower clamping piece); 2. a voltage source; 3. a temperature control device; 4. fixing a bracket; 5. the grounding clamp (5-1, an upper clamping seat; 5-2, a lower clamping seat; 5-3-1, a first rotating shaft; 5-3-2, a second rotating shaft; 5-4-1, a first limiting rod; 5-4-2, a second limiting rod; 5-5-1, a first limiting block; 5-5-2, a second limiting block).

Detailed Description

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

It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the disclosure, but is made for the purpose of illustrating the general principles of the disclosure and not for the purpose of limiting the scope of the disclosure. The scope of the disclosure is to be determined by the claims appended hereto.

To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting 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 apparatus, including:

the device comprises a rotary clamp 1 and a rotary machine (not shown in the figure) connected with the rotary clamp 1, wherein one end of a cable to be tested is clamped by the rotary clamp 1, and the rotary clamp 1 and the rotary machine form a torsion assembly so as to perform torsion test on the cable to be tested;

and the voltage source 2 is connected with the other end of the cable to be tested, so that the cable to be tested is subjected to a withstand voltage test while a torsion test is performed.

The above embodiments constitute a complete technical solution of the present disclosure. According to the embodiment, the wind power torsion cable can be subjected to pressure resistance and torsion tests at the same time, the condition of the wind power torsion cable in an actual operation environment is simulated to the maximum extent, and the reliability of the pressure resistance and torsion detection result of the cable is improved. In addition, the voltage application and the voltage withstand test of the cable can be completed simultaneously only by the voltage source without additionally arranging a voltage withstand tester, and compared with the existing equipment, the cable voltage withstand test device has the advantages that the size is reduced, and the cost is reduced.

In another embodiment, as shown in fig. 2, the rotary fixture 1 includes an upper fixture body and a lower fixture body, the upper fixture body includes an upper fixture seat 1-1 and an upper clamping piece 1-2, the lower fixture body includes a lower fixture seat 1-3 and a lower clamping piece 1-4, and the upper fixture seat 1-1 and the lower fixture seat 1-3 are connected by a bolt.

In this embodiment, the upper clamping piece and the lower clamping piece are welded on the upper clamp seat and the lower clamp seat respectively, and both adopt a triangular structure, and the included angle is 120 °. Compare the clamping piece of the arc design that often adopts among the prior art, this embodiment is through adopting the triangle-shaped design, different model cables of cooperation centre gripping that can be fine to the centre gripping is stable, and the cable is difficult for skidding. In addition, the surface of going up clamping piece and lower clamping piece all is provided with parallel tooth's socket, and the tooth's socket interval is 1mm, can further strengthen the centre gripping stability of the cable that awaits measuring for difficult slipping between cable and the anchor clamps. The upper clamp seat, the lower clamp seat and the upper clamp block and the lower clamp block are both made of carburized gear steel, wherein the hardness of the clamp blocks is 55 HRC-65 HRC.

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

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

In this embodiment, the variable frequency power supply may be configured to output a voltage with a variable frequency; the transformer adopts a 330kV experimental transformer and is used for amplifying the amplitude of the voltage output by the variable frequency power supply so as to ensure that the output end has enough voltage; the protective resistor is composed of series resistors to prevent the power supply from being damaged by overlarge current caused by short circuit; the voltage divider is composed of a voltage dividing capacitor so as to ensure the stability of the electrostatic voltmeter in the process of carrying out voltage withstand test on the cable; the electrostatic voltmeter is used for testing the voltage amplitude of the two ends of the cable sample in the twisting process.

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

The temperature control device is a testing device which provides a certain temperature environment for a cable sample in a testing process with temperature requirements, the common digital electronic temperature controller is adopted in the embodiment, the NTC heat-sensitive sensor is adopted to generate induced voltage and current, and then digital quantization control is carried out on the temperature, and the device has the advantages of high precision, good sensitivity and the like. The temperature control range of the temperature controller is between minus 60 ℃ and plus 60 ℃, because a cable port can be in certain contact with parts such as an experimental device, and the like, and the temperature generally has a certain difference with cables at other positions, the temperature difference required by the position where the cable is located cannot exceed +/-3 ℃ in order to ensure the reliability of the experimental result, and the placing time is not less than 24 hours.

In another embodiment, the device further comprises a fixing support 4.

In this embodiment, the fixed bolster is fixed in one side of temperature control device to fix the one end that cable to be measured and voltage source are connected.

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

In this embodiment, the grounding fixture includes an upper clamping seat 5-1 and a lower clamping seat 5-2, two sides of the upper clamping seat 5-1 and the lower clamping seat 5-2 are connected through a first limiting rod 5-4-1 and a second limiting rod 5-4-2, a first rotating shaft 5-3-1 is disposed in the first limiting rod 5-4-1, a second rotating shaft 5-3-2 is disposed in the second limiting rod 5-4-2, a first limiting block 5-5-1 is disposed on the upper portion of the first limiting rod, and a second limiting block 5-5-2 is disposed on the upper portion of the second limiting rod.

The working principle of the device according to the present disclosure is further explained below.

Firstly, a cable sample to be tested is completely placed in a temperature control device, and is placed for not less than 24 hours at the test temperature of the expected test, so as to simulate the working condition under real use. Then, a torsion test is started, and the specific process is as follows: one end of a cable sample with the length of about 12m is fixed on a rotating clamp, the other end of the cable sample is fixed on a fixed support, and the height of the rotating clamp from the fixed support is about 7 m-9 m. And applying a test voltage to a voltage source end, wherein the test capacity is 30-30000kVA, the test voltage is 1000kV or below, the frequency range is 20-300 Hz, and the test voltage is adjusted within an allowable range according to requirements. The rotary fixture is firstly twisted clockwise 1080 degrees, then twisted anticlockwise by the same angle to enable the sample to be restored to the initial state, and then twisted anticlockwise by 1080 degrees and then twisted clockwise by the same angle to enable the sample to be restored to the initial state, wherein the period is one period. The rotating speed of the rotating clamp is generally 720-1440 degrees/min. When the user has no special requirement, 10000 cycles of tests are recommended. In the whole torsion test process, the rotating machine can automatically record and control the rotating times, the static voltmeter can test the test voltage in real time, the temperature control device can test the test temperature in real time, and the upper computer can record and store relevant data.

The technical solutions provided by the present disclosure are described in detail with reference to specific embodiments, and meanwhile, the descriptions of the above embodiments are only used to help understanding the method and the core idea of the present disclosure, and for a person skilled in the art, according to the idea of the present disclosure, there may be changes in the specific implementation and the application scope. Accordingly, the description should not be construed as limiting the 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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