CN109782080B - Cable insulation space charge signal wireless transmission system - Google Patents
Cable insulation space charge signal wireless transmission system Download PDFInfo
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- CN109782080B CN109782080B CN201910015575.3A CN201910015575A CN109782080B CN 109782080 B CN109782080 B CN 109782080B CN 201910015575 A CN201910015575 A CN 201910015575A CN 109782080 B CN109782080 B CN 109782080B
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Abstract
The invention relates to a cable insulation space charge signal wireless transmission system which comprises a space charge sensor, an amplifier, a Bluetooth module, a space charge measuring device and a high-voltage pulse power supply, wherein the space charge sensor, the amplifier and the Bluetooth module are fixedly arranged on a cable stress cone through a sensor fixing frame, the high-voltage pulse power supply is connected to the cable stress cone and applies high-voltage pulses to the cable stress cone, the space charge sensor, the amplifier and the Bluetooth module are sequentially connected, and the Bluetooth module is wirelessly connected with the space charge measuring device arranged on the ground and transmits insulation space charge signals. The space charge sensor is arranged on the cable stress cone, so that the space charge sensor is in close contact with the cable accessory stress cone and transmits a space charge signal to the space charge measuring device in a Bluetooth wireless communication mode, the sensitivity of space charge signal testing is ensured, the convenience of carrying and installation is also considered, and the space charge testing can be effectively carried out on the cable accessory of the distribution cable.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to a cable insulation space charge signal wireless transmission system.
Background
With the rapid development of social economy in China, the demand of economic life is greater and greater for electric energy, more and more power equipment faults are generated, and most of the power equipment faults are caused by insulation problems. Cable faults that operate in the field are classified by location into cable primary insulation faults and cable accessory faults. According to the statistics of the distribution network cable faults of the national power grid company, the cable accessory faults including the intermediate joint and the terminal account for about 90% of the total faults. Cable accessories are the primary components that restrict the reliable operation of the cable. For the fault reason of the cable accessory, the defect is introduced by the fault of the stress cone in the field installation process according to the past inference only by experience; but experimental results show that the stress cone is correctly installed and the cable accessories with good interface contact still have breakdown. This illustrates the essential reason that there is a deep level of cable insulation breakdown failure at the stress cone.
In the cable operation field, the cable accessories can accumulate space charge under the condition of long-term operation, and the distribution and movement of the space charge have strong influence on the conductivity, aging, breakdown and the like of the insulating material due to the distortion effect of an electric field accumulated by the space charge. Under the action of an applied electric field, especially a direct current electric field, the accumulation of space charge can seriously distort the original electric field distribution in the dielectric, store certain electromechanical energy and cause the excitation and recombination of charge, thereby causing the microscopic destruction of the dielectric material and the final breakdown of the dielectric. Therefore, the distribution and transfer of space charge can change the distribution of the original electric field in the insulating medium, and the local electric field in the material can be strengthened or weakened, so that the electrical characteristics of the dielectric material are influenced.
Therefore, the field detection of the distribution and accumulation of space charge in the cable accessories is of great significance for predicting the service life of the cable and preventing the breakdown of the cable. In about 80 s, space charge nondestructive measurement methods, pressure wave expansion (PWP), laser intensity modulation (LIMM), electro-acoustic Pulse (PEA), and the like have appeared. In the current scientific research, the most common method is the electro-acoustic pulse method (PEA), which has been used for spatial distribution of actual cable samples in a laboratory, however, the existing space charge testing device is a rectangular metal shell, a space charge testing sensor and an amplifier are arranged in the metal shell to shield the interference of external electromagnetic signals to the space charge testing, the size and the weight are too large, and the carrying and the installation are inconvenient, so the device cannot be applied to a cable operation site.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cable insulation space charge signal wireless transmission system which is reasonable in design, compact in structure and convenient to carry and install.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a cable insulation space charge signal wireless transmission system comprises a space charge sensor, an amplifier, a Bluetooth module, a space charge measuring device and a high-voltage pulse power supply, wherein the space charge sensor, the amplifier and the Bluetooth module are fixedly arranged on a cable stress cone through a sensor fixing frame, the high-voltage pulse power supply is connected to the cable stress cone and applies high-voltage pulses to the cable stress cone, the space charge sensor, the amplifier and the Bluetooth module are sequentially connected, and the Bluetooth module is wirelessly connected with the space charge measuring device arranged on the ground and transmits insulation space charge signals.
The space charge sensor comprises a PPMA cylinder, an inner layer aluminum ring and an outer layer aluminum ring which are sleeved together from inside to outside, polytetrafluoroethylene materials are filled between the inner layer aluminum ring and the outer layer aluminum ring, and an SMA cylinder is installed at the bottom of the inner layer aluminum ring and penetrates through the outer layer aluminum ring.
The sensor fixing frame is a circular plastic fixing clamp which is of a buckle structure with adjustable tightness.
The space charge measuring device is a PEA space charge measuring device with a Bluetooth communication function.
The invention has the advantages and positive effects that:
1. the space charge sensor is arranged on the cable stress cone, so that the space charge sensor is in close contact with the cable accessory stress cone and transmits a space charge signal to the space charge measuring device in a Bluetooth wireless communication mode, the sensitivity of space charge signal testing is ensured, the convenience of carrying and installation is also considered, and the space charge testing can be effectively carried out on the cable accessory of the distribution cable.
2. The invention abandons the shielding shell structure of the sensor, greatly reduces the volume of the test system, improves the anti-interference capability of wireless signals, is convenient to carry and install, is convenient to measure space charge at the cable accessory on the cable operation site, and improves the practicability of the system.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of a space charge sensor.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A cable insulation space charge signal wireless transmission system is shown in figure 1 and comprises a space charge sensor 3, an amplifier, a Bluetooth module, a space charge measuring device and a high-voltage pulse power supply, wherein the space charge sensor, the amplifier and the Bluetooth module are fixedly arranged on a cable stress cone 1 through a sensor fixing frame 2 to ensure the quality of signal measurement, the sensor fixing frame adopts a circular plastic fixing clamp, and the fixing clamp adopts a buckle design capable of adjusting tightness and is convenient to adjust while being installed. The high-voltage pulse power supply is connected to the cable stress cone to apply high-voltage pulses to the cable stress cone, so that a space charge waveform signal is generated. The space charge sensor collects cable insulation space charge signals, the cable insulation space charge signals are amplified by the amplifier, the amplified insulation space charge signals are transmitted to the space charge measuring device through the Bluetooth module, the space charge measuring device is provided with a PEA space charge measuring device with a Bluetooth communication function, the PEA space charge measuring device is used for receiving and displaying space charge waveform signals, and the PEA space charge measuring device is arranged on the ground to facilitate waveform observation of testers.
As shown in fig. 2, the space charge sensor comprises a PPMA cylinder 7, an inner aluminum ring 6 and an outer aluminum ring 4 which are sleeved together from inside to outside, wherein a polytetrafluoroethylene material 5 is filled between the inner aluminum ring and the outer aluminum ring, and an SMA cylinder 8 is installed at the bottom of the inner aluminum ring and penetrates through the outer aluminum ring.
The use method of the space charge signal wireless transmission system comprises the following steps:
1. fixedly installing a space charge sensor, a high-voltage pulse power supply, an amplifier and a Bluetooth module on the outer side of a cable stress cone;
2. the Bluetooth wireless module is connected with the PEA space charge measuring device to meet the real-time signal transmission requirement;
3. supplying power to the PEA space charge measuring device, applying pulse high voltage through a high-voltage pulse power supply, and obtaining a space charge signal by a space charge sensor; and transmitting a wireless signal by adopting Bluetooth, transmitting the wireless signal to a PEA space charge measuring device on the ground to receive the signal and observing the signal.
Nothing in this specification is said to apply to the prior art.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (3)
1. A cable insulation space charge signal wireless transmission system is characterized in that: the space charge sensor, the amplifier and the Bluetooth module are fixedly arranged on a cable stress cone through a sensor fixing frame, the high-voltage pulse power supply is connected to the cable stress cone to apply high-voltage pulses to the cable stress cone, the space charge sensor, the amplifier and the Bluetooth module are sequentially connected, and the Bluetooth module is wirelessly connected with the space charge measuring device arranged on the ground and transmits an insulated space charge signal;
the space charge sensor comprises a PPMA cylinder, an inner layer aluminum ring and an outer layer aluminum ring which are sleeved together from inside to outside, polytetrafluoroethylene materials are filled between the inner layer aluminum ring and the outer layer aluminum ring, and an SMA cylinder is installed at the bottom of the inner layer aluminum ring and penetrates through the outer layer aluminum ring.
2. The system for wireless transmission of a cable-insulated space-charge signal according to claim 1, wherein: the sensor fixing frame is a circular plastic fixing clamp which is of a buckle structure with adjustable tightness.
3. The system for wireless transmission of a cable-insulated space-charge signal according to claim 1, wherein: the space charge measuring device is a PEA space charge measuring device with a Bluetooth communication function.
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| CN201910015575.3A CN109782080B (en) | 2019-01-08 | 2019-01-08 | Cable insulation space charge signal wireless transmission system |
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| CN201910015575.3A CN109782080B (en) | 2019-01-08 | 2019-01-08 | Cable insulation space charge signal wireless transmission system |
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| CN109782080B true CN109782080B (en) | 2021-03-19 |
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| CN111765958A (en) * | 2020-05-26 | 2020-10-13 | 山东大学 | Vibration type identification method and system based on distributed optical fiber vibration radial distance measurement |
| CN112748293B (en) * | 2020-12-22 | 2022-09-02 | 国网湖北省电力有限公司电力科学研究院 | Measuring system for internal space charge distribution of high-voltage direct-current sleeve in operating state |
| CN115856456B (en) * | 2023-02-27 | 2023-06-23 | 国网山东省电力公司广饶县供电公司 | Cable charge test data transmission method |
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| CN205178461U (en) * | 2015-08-31 | 2016-04-20 | 国网智能电网研究院 | DC cable connects |
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| CN101696995B (en) * | 2009-11-10 | 2011-07-20 | 上海交通大学 | Measurement system of space charge of coaxial high-voltage direct current plastic cable |
| CN101706537B (en) * | 2009-11-16 | 2011-06-08 | 华北电力大学 | PEA space charge test device capable of testing conductive current |
| CN101975805B (en) * | 2010-08-09 | 2014-11-19 | 南开大学 | Packaging probe of photoelectric biochemical quantity semiconductor sensor |
| CN102480116A (en) * | 2010-11-23 | 2012-05-30 | 上海市电力公司 | Prefabricated joint for high-voltage direct-current cross-linked polyethylene cable |
| CN105527504B (en) * | 2015-12-02 | 2019-03-05 | 中国电力科学研究院 | A kind of space charge density measuring system |
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| CN205178461U (en) * | 2015-08-31 | 2016-04-20 | 国网智能电网研究院 | DC cable connects |
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| 交联聚乙烯电缆交流空间电荷与老化特性研究;何东欣;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20171231;第74-75页 * |
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