A test system for simulating vibration aging of composite insulation crossarms

Abstract

The present invention discloses a test system for simulating the vibration aging of a composite insulating crossarm, comprising: a mechanical base, an electric pole, and a vibration test device; wherein the vibration test device comprises: an eccentric motor, a force-bearing connecting rod, a connecting spring, a force-bearing bracket, a fixed support, a load monitoring unit, and a strain monitoring unit. By connecting the composite insulating crossarm to the vibration test device, obtaining the corresponding connecting spring according to the deadweight of the conductor of the actual power transmission system, and adjusting the corresponding eccentric motor speed according to the actual operating environment, the scenario of the composite insulating crossarm generating vibration under the actual operating environment is simulated, and the load value and strain value of the composite insulating crossarm are obtained by the load monitoring unit and the strain monitoring unit, so as to realize the research on the stress fatigue aging resistance performance of the composite insulating crossarm. The present invention can effectively simulate the stress conditions and mechanical loading characteristics of the composite insulating crossarm under long-term mechanical vibration during operation.

Description

Technical Field

[0001] The invention relates to the technical field of research on insulation characteristics of composite insulating cross arms, and in particular to a test system for simulating vibration aging of composite insulating cross arms. Background Art

[0002] With the improvement of my country's power grid technology, transmission lines are showing a trend of long distance, large-scale and large-scale development. At present, most of my country's transmission lines are operated in the form of traditional iron towers, steel pipe poles, concrete poles, steel crossarms, and suspended insulator strings. With the increase of the voltage level of the transmission line, the amount of steel used in the tower increases, and in order to ensure the safe operation of the transmission line, it is necessary to increase the distance between the transmission lines, which increases the area occupied by the transmission corridor, which brings considerable pressure to the investment and construction of the transmission line. Therefore, composite insulating crossarms, as a new type of crossarm with small size, light weight, high mechanical strength and excellent electrical performance, are showing a rapid development trend in my country and have broad application prospects in the future.

[0003] In order to optimize the overall performance of the new composite insulation cross-arm, the selection of internal insulation materials and multi-factor aging analysis of the cross-arm has always been a widely discussed technical core point. It is related to whether the new composite insulation cross-arm can really replace the traditional cross-arm and achieve long-term development in the power grid. At present, the research on composite insulation cross-arms mainly focuses on analyzing the mechanical fatigue of some structures, such as pipe connection points, caused by the increase of its mechanical strength with the operation time. However, the weak links of composite insulation cross-arms also include the deterioration of its interface performance and the appearance of micropores or cracks due to aging conditions, such as the increase of mechanical vibration. When moisture or dirt enters the interior, it will cause partial discharge, which may cause external insulation breakdown in severe cases. Therefore, considering the mechanical force and mechanical loading characteristics of the composite insulation cross-arm, it is of great significance to study the interface characteristics of the composite insulation cross-arm under long-term aging conditions. Summary of the invention

[0004] The purpose of an embodiment of the present invention is to provide a test system for simulating the vibration aging of a composite insulating crossarm, which can effectively simulate the stress conditions and mechanical loading characteristics of the composite insulating crossarm under long-term mechanical vibration during operation, so as to realize the study of the stress fatigue aging resistance of the composite insulating crossarm.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides a test system for simulating vibration aging of a composite insulating crossarm, comprising: a mechanical base, an electric pole, and a vibration test device; wherein the vibration test device comprises: an eccentric motor, a force-bearing connecting rod, a connecting spring, a force-bearing bracket, a fixed support, a load monitoring unit, and a strain monitoring unit;

[0006] The electric pole is fixedly connected to the middle part of the mechanical base, and the composite insulating cross arm is transversely connected to the upper part of the electric pole; the strain monitoring unit is connected to the composite insulating cross arm;

[0007] The top end of the first force-bearing bracket is connected to the first end of the composite insulating crossarm, the first end of the first force-bearing bracket is fixedly connected to the first end of the first load monitoring unit, the second end of the first load monitoring unit is detachably connected to the first end of the first connecting spring, the second end of the first connecting spring is detachably connected to the first end of the first force-bearing connecting rod, and the second end of the first force-bearing connecting rod is fixedly connected to the first eccentric motor; the first eccentric motor is arranged at the first end of the mechanical base; the second end of the first force-bearing bracket is detachably connected to the first end of the second connecting spring, the second end of the second connecting spring is detachably connected to the first fixed support, the first fixed support is arranged directly below the first end of the composite insulating crossarm, and is fixedly connected to the mechanical base;

[0008] The top end of the second force-bearing bracket is connected to the second end of the composite insulating crossarm, the first end of the second force-bearing bracket is fixedly connected to the first end of the second load monitoring unit, the second end of the second load monitoring unit is detachably connected to the first end of the third connecting spring, the second end of the third connecting spring is detachably connected to the first end of the second force-bearing connecting rod, and the second end of the second force-bearing connecting rod is fixedly connected to the second eccentric motor; the second eccentric motor is arranged at the second end of the mechanical base; the second end of the second force-bearing bracket is detachably connected to the first end of the fourth connecting spring, the second end of the fourth connecting spring is detachably connected to the second fixed support, and the second fixed support is arranged directly below the second end of the composite insulating crossarm and is fixedly connected to the mechanical base.

[0009] As an improvement of the above solution, the load monitoring unit is a dynamometer.

[0010] As an improvement of the above solution, the strain detection unit is a strain gauge;

[0011] The strain detection unit is connected to the composite insulating cross arm, specifically: the strain gauge is pasted on the strain measuring point of the composite insulating cross arm.

[0012] As an improvement of the above solution, the number of the strain gauges is at least one.

[0013] As an improvement of the above solution, the mechanical base is composed of channel steel and flange; the electric pole is fixedly connected to the middle part of the channel steel, and the flange is used to fix the connection between the electric pole and the channel steel.

[0014] As an improvement of the above solution, a speed regulating belt is provided in the eccentric motor, and the speed regulating belt is used to control the rotation speed of the eccentric motor so that the eccentric motor generates vibration.

[0015] As an improvement of the above solution, the elastic modulus of the connecting spring is selected according to the deadweight of different conductors in the power transmission system.

[0016] As an improvement of the above solution, the test system for simulating vibration aging of composite insulating crossarms includes at least two sets of vibration test devices; the at least two sets of vibration test devices are installed on the mechanical base at the same time and share the same set of eccentric motors.

[0017] Compared with the prior art, the present invention discloses a test system for simulating vibration aging of a composite insulating crossarm, comprising: a mechanical base, an electric pole, and a vibration test device; wherein the vibration test device comprises: an eccentric motor, a force-bearing connecting rod, a connecting spring, a force-bearing bracket, a fixed support, a load monitoring unit, and a strain monitoring unit. By connecting the composite insulating crossarm to be tested with the vibration test device, obtaining the corresponding connecting spring according to the deadweight of the conductor of the actual power transmission system, and adjusting the corresponding eccentric motor speed according to the actual operating environment, the scenario of vibration of the composite insulating crossarm under the actual operating environment is simulated, and the load value and strain value of the composite insulating crossarm are obtained through the load monitoring unit and the strain monitoring unit, so as to realize the research on the stress fatigue aging resistance of the composite insulating crossarm. By adopting the embodiment of the present invention, the mechanical force and mechanical loading characteristics of the composite insulating crossarm caused by the increase of mechanical vibration during the actual application process can be effectively simulated, which is conducive to studying the interface performance of the composite insulating crossarm to assist in optimizing the overall performance of the power transmission equipment, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the planar structure of a test system for simulating vibration aging of a composite insulation crossarm in an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the connection relationship between the composite insulating cross arm and the strain gauge in an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the spatial structure of a test system for simulating vibration aging of a composite insulation cross arm according to an embodiment of the present invention;

[0021] In the figure, 1-mechanical base, 11-channel steel, 12-flange; 2-electric pole; 3-vibration test device, 31-eccentric motor, 32-loaded connecting rod, 33-connecting spring, 34-loaded bracket, 35-fixed support, 36-load monitoring unit, 37-strain monitoring unit, 38-speed belt, 4-composite insulating cross arm. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 It is a schematic diagram of the planar structure of a test system for simulating the vibration aging of a composite insulating crossarm in an embodiment of the present invention; a test system for simulating the vibration aging of a composite insulating crossarm provided in an embodiment of the present invention comprises: a mechanical base 1, an electric pole 2, and a vibration test device 3; wherein, the vibration test device 3 comprises: an eccentric motor 31, a force-bearing connecting rod 32, a connecting spring 33, a force-bearing bracket 34, a fixed support 35, a load monitoring unit 36 ​​and a strain monitoring unit 37.

[0024] In the embodiment of the present invention, at least one composite insulating cross arm 4 for testing is provided. The composite insulating cross arm 4 is laterally connected to the upper part of the electric pole 2, and the electric pole 2 is fixedly connected to the middle part of the mechanical base 1, so as to simulate the connection structure between the composite insulating cross arm and the electric pole of the electric power transmission system in the actual electric power transmission system.

[0025] It can be understood that the composite insulating cross-arm can be any type of composite insulating cross-arm used in the power transmission system, such as a 10KV composite insulating cross-arm, which is not specifically limited here.

[0026] Furthermore, the force-bearing support 34 includes a first force-bearing support and a second force-bearing support; the load monitoring unit 36 ​​includes a first load monitoring unit and a second load monitoring unit; the connecting spring 33 includes a first connecting spring, a second connecting spring, a third connecting spring and a fourth connecting spring; the force-bearing connecting rod 32 includes a first force-bearing connecting rod and a second force-bearing connecting rod; the fixed support 35 includes a first fixed support and a second fixed support, and the eccentric motor 31 includes a first eccentric motor and a second eccentric motor.

[0027] The strain monitoring unit 37 is connected to the composite insulating crossarm 4; the top end of the first force-bearing bracket 34 is connected to the first end of the composite insulating crossarm 4, the first end of the first force-bearing bracket 34 is fixedly connected to the first end of the first load monitoring unit 36, the second end of the first load monitoring unit 36 ​​is detachably connected to the first end of the first connecting spring 33, the second end of the first connecting spring 33 is detachably connected to the first end of the first force-bearing connecting rod 32, and the second end of the first force-bearing connecting rod 32 is fixedly connected to the first eccentric motor 31; the first eccentric motor 31 is arranged at the first end of the mechanical base 1; the second end of the first force-bearing bracket 34 is detachably connected to the first end of the second connecting spring 33, the second end of the second connecting spring 33 is detachably connected to the first fixed support 35, the first fixed support 35 is arranged directly below the first end of the composite insulating crossarm 4, and is fixedly connected to the mechanical base 1;

[0028] The top end of the second force-bearing bracket 34 is connected to the second end of the composite insulating crossarm 4, the first end of the second force-bearing bracket 34 is fixedly connected to the first end of the second load monitoring unit 36, the second end of the second load monitoring unit 36 ​​is detachably connected to the first end of the third connecting spring 33, the second end of the third connecting spring 33 is detachably connected to the first end of the second force-bearing connecting rod 32, the second end of the second force-bearing connecting rod 32 is fixedly connected to the second eccentric motor 31; the second eccentric motor 31 is arranged at the second end of the mechanical base 1; the second end of the second force-bearing bracket 34 is detachably connected to the first end of the fourth connecting spring 33, the second end of the fourth connecting spring 33 is detachably connected to the second fixed support 352, the second fixed support 35 is arranged directly below the second end of the composite insulating crossarm 4, and is fixedly connected to the mechanical base 1.

[0029] Preferably, a speed regulating belt 38 is provided in the eccentric motor 31 , and the speed regulating belt 38 is used to control the rotation speed of the eccentric motor 31 so as to make the eccentric motor 31 vibrate.

[0030] In the embodiment of the present invention, after the composite insulating cross arm 4 for testing is connected to the test system for simulating vibration aging of the composite insulating cross arm, the speed of the eccentric motor 31 is controlled by adjusting the frequency of the speed regulating belt 38. The eccentric motor 31 generates vibrations, pulling the composite insulating cross arm 4 to swing at a low frequency.

[0031] It should be noted that, according to the different wind speed conditions to which the power transmission system is subjected in the actual operating environment, the operating frequency of the speed regulating belt 38 is obtained through experiments and calculations, and according to the deadweight of different conductors in the power transmission system, a connecting spring 33 with a suitable elastic modulus is selected to act on the composite insulating crossarm as a static load to simulate the scenario in which the conductors of the power transmission system drive the composite insulating crossarm to dance under strong winds. Furthermore, by obtaining the load value monitored by the load monitoring unit 36, it can be used to evaluate the ultimate bearing capacity of the composite insulating crossarm, and by obtaining the strain value monitored by the strain monitoring unit 37, it can be used to evaluate the stress condition of the composite insulating crossarm. Combined with the monitored load value and strain value of the composite insulating crossarm 4, the stress fatigue aging resistance performance of the composite insulating crossarm is studied.

[0032] It can be understood that each of the connecting springs 33 is in a detachable state in the test system for simulating vibration aging of the composite insulation crossarm, and a suitable connecting spring 33 can be selected for replacement according to the deadweight of the conductors of different power transmission systems and different operating environments.

[0033] As a preferred embodiment, the load monitoring unit 36 ​​is a tensile gauge, which is used to measure the load applied to the composite insulating cross arm.

[0034] As a preferred embodiment, the strain detection unit 37 is a strain gauge. Figure 2 , is a schematic diagram of the connection relationship between the composite insulating cross arm and the strain gauge in the embodiment of the present invention. The strain gauge is pasted on the strain measuring point of the composite insulating cross arm 4.

[0035] Furthermore, the number of the strain gauges is at least one. By setting a plurality of strain measuring points on the composite insulating cross arm 4, the strain gauge is pasted on the strain side point. When the composite insulating cross arm is subjected to force, the strain measuring point is strained, and the sensitive grid in the strain gauge is deformed accordingly, causing its resistance to change. The resistance change in the strain gauge is then measured by a special instrument and converted into the strain value of the strain measuring point.

[0036] As a preferred embodiment, the mechanical base 1 is composed of a channel steel 11 and a flange 12. The electric pole 2 is fixedly connected to the middle of the channel steel 11, and the flange 12 is used to fix the connection between the electric pole 2 and the channel steel 11.

[0037] Preferably, see Figure 3, is a schematic diagram of the spatial structure of a test system for simulating vibration aging of a composite insulation cross arm in an embodiment of the present invention. The test system for simulating vibration aging of a composite insulation cross arm comprises at least two sets of the vibration test devices 3; the at least two sets of vibration test devices 3 are simultaneously installed on the mechanical base 1 and share the same set of eccentric motors 31.

[0038] In the embodiment of the present invention, the mechanical base is preferably assembled and welded from 200 channel steel into a 3m*2m base structure. On the mechanical base, two or more sets, preferably four sets, of vibration test devices are installed at the same time, and the same eccentric motor provides vibration, so as to simultaneously test different composite insulating crossarms to be tested, simulate the aging state of different composite insulating crossarms under the same operating environment, and study and compare the stress fatigue aging resistance of different composite insulating crossarms.

[0039] It can be understood that the size of the mechanical base mentioned above is only an example, and the size of the mechanical base can also be set according to the number of vibration test devices 3 actually installed, and is not specifically limited here.

[0040] It should be noted that the above-mentioned expressions "first", "second", "third" and "fourth" are only used to distinguish the number of components. The structural parameter settings of the same components can be set according to actual conditions, and can be the same or different parameter settings, which will not affect the beneficial effects achieved by the present invention.

[0041] The embodiment of the present invention provides a test system for simulating the vibration aging of a composite insulating crossarm, comprising: a mechanical base, an electric pole, and a vibration test device; wherein the vibration test device comprises: an eccentric motor, a force-bearing connecting rod, a connecting spring, a force-bearing bracket, a fixed support, a load monitoring unit, and a strain monitoring unit. By connecting the composite insulating crossarm to be tested with the vibration test device, obtaining the corresponding connecting spring according to the deadweight of the conductor of the actual power transmission system, and adjusting the corresponding eccentric motor speed according to the actual operating environment, the scenario of the composite insulating crossarm generating vibration under the actual operating environment is simulated, and the load value and strain value of the composite insulating crossarm are obtained through the load monitoring unit and the strain monitoring unit, so as to realize the research on the stress fatigue aging resistance of the composite insulating crossarm. By adopting the embodiment of the present invention, the mechanical force and mechanical loading characteristics of the composite insulating crossarm caused by the increase of mechanical vibration during the actual application process can be effectively simulated, which is conducive to studying the interface performance of the composite insulating crossarm to assist in optimizing the overall performance of the power transmission equipment, and the operation is simple.

[0042] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A test system for simulating vibration aging of composite insulation crossarms, characterized in that: include: A mechanical base, an electric pole, and a vibration test device; wherein the vibration test device comprises: an eccentric motor, a force-bearing connecting rod, a connecting spring, a force-bearing bracket, a fixed support, a load monitoring unit, and a strain monitoring unit; the eccentric motor comprises a first eccentric motor and a second eccentric motor, the force-bearing connecting rod comprises a first force-bearing connecting rod and a second force-bearing connecting rod, the connecting spring comprises a first connecting spring, a second connecting spring, a third connecting spring, and a fourth connecting spring, the force-bearing bracket comprises a first force-bearing bracket and a second force-bearing bracket, the fixed bracket comprises a first fixed bracket and a second fixed bracket, and the load monitoring unit comprises a first load monitoring unit and a second load monitoring unit; The electric pole is fixedly connected to the middle part of the mechanical base, and the composite insulating cross arm is transversely connected to the upper part of the electric pole; the strain monitoring unit is connected to the composite insulating cross arm; The top end of the first force-bearing bracket is connected to the first end of the composite insulating crossarm, the first end of the first force-bearing bracket is fixedly connected to the first end of the first load monitoring unit, the second end of the first load monitoring unit is detachably connected to the first end of the first connecting spring, the second end of the first connecting spring is detachably connected to the first end of the first force-bearing connecting rod, and the second end of the first force-bearing connecting rod is fixedly connected to the first eccentric motor; the first eccentric motor is arranged at the first end of the mechanical base; the second end of the first force-bearing bracket is detachably connected to the first end of the second connecting spring, the second end of the second connecting spring is detachably connected to the first fixed support, the first fixed support is arranged directly below the first end of the composite insulating crossarm, and is fixedly connected to the mechanical base; The top end of the second force-bearing bracket is connected to the second end of the composite insulating crossarm, the first end of the second force-bearing bracket is fixedly connected to the first end of the second load monitoring unit, the second end of the second load monitoring unit is detachably connected to the first end of the third connecting spring, the second end of the third connecting spring is detachably connected to the first end of the second force-bearing connecting rod, and the second end of the second force-bearing connecting rod is fixedly connected to the second eccentric motor; the second eccentric motor is arranged at the second end of the mechanical base; the second end of the second force-bearing bracket is detachably connected to the first end of the fourth connecting spring, the second end of the fourth connecting spring is detachably connected to the second fixed support, the second fixed support is arranged directly below the second end of the composite insulating crossarm, and is fixedly connected to the mechanical base; The load monitoring unit is a dynamometer; a speed regulating belt is provided in the eccentric motor, and the speed regulating belt is used to control the rotation speed of the eccentric motor so as to make the eccentric motor vibrate.

2. The test system for simulating vibration aging of composite insulation crossarms according to claim 1, characterized in that: The strain detection unit is a strain gauge; The strain detection unit is connected to the composite insulating cross arm, specifically: the strain gauge is pasted on the strain measuring point of the composite insulating cross arm.

3. The test system for simulating vibration aging of composite insulation crossarms as claimed in claim 2, characterized in that: The number of the strain gauge is at least one.

4. The test system for simulating vibration aging of composite insulation crossarms as claimed in claim 1, characterized in that: The mechanical base is composed of channel steel and flange; the electric pole is fixedly connected to the middle part of the channel steel, and the flange is used to fix the connection between the electric pole and the channel steel.

5. The test system for simulating vibration aging of composite insulation crossarms as claimed in claim 1, characterized in that: The elastic modulus of the connecting spring is selected according to the deadweight of different conductors in the power transmission system.

6. The test system for simulating vibration aging of composite insulation crossarms as claimed in claim 1, characterized in that: The test system for simulating vibration aging of composite insulating crossarms comprises at least two sets of vibration test devices; the at least two sets of vibration test devices are simultaneously installed on the mechanical base and share the same set of eccentric motors.

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