CN107831410B - Capacitive sleeve end screen signal detection device - Google Patents
Capacitive sleeve end screen signal detection device Download PDFInfo
- Publication number
- CN107831410B CN107831410B CN201710883253.1A CN201710883253A CN107831410B CN 107831410 B CN107831410 B CN 107831410B CN 201710883253 A CN201710883253 A CN 201710883253A CN 107831410 B CN107831410 B CN 107831410B
- Authority
- CN
- China
- Prior art keywords
- frequency
- metal shell
- low
- circuit board
- conditioning circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a capacitive bushing end screen signal detection device. The existing device has the defects of inconvenient installation, large signal attenuation, low detection efficiency, potential safety hazard and the like. The invention comprises a signal acquisition device and a signal processing device which are connected through threads. The signal acquisition device comprises a first metal shell, a terminal of the end screen, a high-frequency partial discharge sensor and a low-frequency dielectric loss sensor, wherein the terminal of the end screen is positioned in the first metal shell, and the high-frequency partial discharge sensor and the low-frequency dielectric loss sensor are sleeved on the terminal of the end screen. The signal processing device comprises a second metal shell, a high-frequency signal conditioning circuit board, a low-frequency signal conditioning circuit board, a high-frequency BNC connector and a low-frequency BNC connector, wherein the high-frequency signal conditioning circuit board and the low-frequency signal conditioning circuit board are arranged in the second metal shell, and the BNC connector is arranged on the second metal shell. The invention has the advantages of excellent shielding performance, good anti-interference performance, safe and reliable use, long-term use and effective adaptation to the field environment.
Description
Technical Field
The invention belongs to the technical field of high-voltage detection, and particularly relates to a capacitive sleeve end screen signal detection device.
Background
Bushing failure is one of the major causes of power failure in electrical equipment. At present, the insulation state of the detection sleeve is mainly detected by means of a traditional preventive test, but the pre-test period is long, and potential faults of the sleeve in operation are difficult to discover in time. Generally, the bushing tip screen has two main structures, one is an external thread structure and the other is an internal thread structure, and the two structures are reliably grounded through the bushing tip screen grounding cover.
The detection of partial discharge of the sleeve is mainly to collect high-frequency partial discharge signals through a sleeve end screen, and related personnel at present research a device for collecting signals at the sleeve end screen. The existing device has the defects of inconvenient installation, large signal attenuation, low detection efficiency, potential safety hazard and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a capacitive sleeve end screen signal detection device.
The specific solution of the invention is as follows:
the device comprises a signal acquisition device and a signal processing device which are connected through threads.
The signal acquisition device comprises a first metal shell, a terminal of a last screen, a high-frequency partial discharge sensor and a low-frequency dielectric loss sensor.
The first metal shell and the end screen wiring terminal are cylindrical, and the end screen wiring terminal is positioned in the first metal shell and is integrally washed with the first metal shell; the end screen wiring terminal is connected with the first metal shell through a connecting platform, one end of the end screen wiring terminal is sealed by the connecting platform, and an annular cavity is formed between the end screen wiring terminal and the first metal shell.
The annular cavity is internally provided with a horizontal annular baffle made of insulating materials, the annular cavity is divided into two spaces by the horizontal annular baffle, and the high-frequency partial discharge sensor and the low-frequency dielectric loss sensor are respectively arranged in the two spaces and sleeved on the terminal of the end screen through a core; one end of the high-frequency coaxial cable is connected with the high-frequency partial discharge sensor, and one end of the low-frequency signal wire is connected with the low-frequency dielectric loss sensor.
The inner wall of the upper part of the first metal shell is provided with an internal thread, and the outer wall of the lower part is provided with an external thread; a crown spring for fixing the sleeve end screen leading-out end is arranged in the end screen wiring end.
The signal processing device comprises a second metal shell, a high-frequency BNC connector, a low-frequency BNC connector, a high-frequency signal conditioning circuit board and a low-frequency signal conditioning circuit board; a horizontal partition plate is arranged in the second metal shell, and the second metal shell and the horizontal partition plate are integrally washed; the high-frequency BNC connector and the low-frequency BNC connector are arranged on the horizontal partition board side by side, and one end of the high-frequency BNC connector and one end of the low-frequency BNC connector penetrate through the horizontal partition board and are used for transmitting signals processed by the device to a high-frequency partial discharge detector or a relative dielectric loss tester for analysis; the second metal shell is cylindrical with two open ends, and external threads are respectively tapped on the outer walls of the upper part and the lower part of the second metal shell.
The lower part of the second metal shell is in threaded connection with the upper part of the first metal shell, a sealing ring is arranged on the end face of the connection, a cylindrical cavity is formed after the connection, and a high-frequency signal conditioning circuit board and a low-frequency signal conditioning circuit board are arranged in the cylindrical cavity; the other end of the high-frequency coaxial cable is connected with the input end of the high-frequency signal conditioning circuit board, and the output end of the high-frequency signal conditioning circuit board is connected with the input end of the high-frequency BNC connector; the other end of the low-frequency signal wire is connected with the input end of the low-frequency signal conditioning circuit board, and the output end of the low-frequency signal conditioning circuit board is connected with the input end of the low-frequency BNC connector.
The grounding metal cap is in threaded connection with the upper part of the second metal shell. When the cover is covered, the high-frequency BNC connector and the low-frequency BNC connector are connected with the grounding metal cap.
When the device is used, the sleeve end screen leading-out end of the capacitive sleeve is aligned with the center of the end screen wiring end in the signal acquisition device, the sleeve end screen leading-out end is reliably contacted with the internal crown spring through rotating the grounding screw thread, the first metal shell is reliably connected with the sleeve end screen grounding cover, the sleeve end screen leading-out end and the sleeve end screen grounding cover form a reliable grounding loop, and the shortest grounding path is formed under the condition that the original grounding mode is not changed.
The invention adopts an integrated sealing structure, has excellent shielding performance, good anti-interference performance, reliable contact of each part, effective grounding, oil resistance, solvent resistance, high temperature resistance and low temperature resistance, safe and reliable use, long-term use and effective adaptation to the field environment. The device is provided with the telescopic crown spring, has the characteristics of good applicability, soft pulling force, small contact resistance, good conductivity, earthquake resistance, impact resistance, stable and reliable connection and the like, and can be suitable for the bushing end screen leading-out ends with different structural sizes. In addition, the screw thread conversion module can be matched according to the size requirement of the actual transformer end screen, the module is convenient to replace and reliable in contact, and can be suitable for sleeve end screen grounding covers with various size structures, and the application range is wide. The whole device does not change the original grounding mode of the bushing end screen, forms the shortest grounding path under the condition of not changing the original grounding mode, and has convenient installation and small signal attenuation. The device is internally provided with a special high-frequency partial discharge sensor and a low-frequency dielectric loss sensor, has wide detection frequency band and high sensitivity, and is internally provided with a special signal processing circuit, so that the detection efficiency is high.
Drawings
FIG. 1 is an overall outline view of a detection device;
fig. 2 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the capacitive sleeve end screen signal detection device comprises a signal acquisition device 1 and a signal processing device 2 which are connected through threads.
As shown in fig. 2, the signal acquisition device 1 comprises a first metal shell 1-1, a terminal 1-2 of a last screen, a high-frequency partial discharge sensor 1-3 and a low-frequency dielectric loss sensor 1-4.
The first metal shell 1-1 and the end screen terminal 1-2 are cylindrical, and the end screen terminal 1-2 is positioned in the first metal shell 1-1 and is integrally washed with the first metal shell 1-1; the end screen terminal 1-2 is connected with the first metal shell 1-1 through a connecting platform 1-5, one end of the end screen terminal 1-2 is sealed by the connecting platform 1-5, and an annular cavity is formed between the end screen terminal 1-2 and the first metal shell 1-1.
The annular cavity is internally provided with a horizontal annular baffle plate 1-6 made of insulating materials, the annular cavity is divided into two spaces by the horizontal annular baffle plate 1-6, and the high-frequency partial discharge sensor 1-3 and the low-frequency dielectric loss sensor 1-4 are respectively arranged in the two spaces and sleeved on the end screen terminal 1-2 in a penetrating way. One end of the high-frequency coaxial cable is connected with the high-frequency partial discharge sensor 1-3, and one end of the low-frequency signal wire is connected with the low-frequency dielectric loss sensor 1-4;
the inner wall of the upper part of the first metal shell 1-1 is tapped with internal threads, and the outer wall of the lower part is tapped with external threads; a crown spring 1-7 for fixing the sleeve end screen leading-out end is arranged in the end screen terminal 1-2.
The signal processing device 2 comprises a second metal shell 2-1, a high-frequency BNC connector 2-2, a low-frequency BNC connector 2-3, a high-frequency signal conditioning circuit board 2-4 and a low-frequency signal conditioning circuit board 2-5. A horizontal partition plate 2-6 is arranged in the second metal shell 2-1, and the second metal shell 2-1 and the horizontal partition plate 2-6 are integrally washed; the high-frequency BNC connector 2-2 and the low-frequency BNC connector 2-3 are arranged on the horizontal partition plate 2-6 side by side, and one end of the high-frequency BNC connector passes through the horizontal partition plate 2-6 and is used for transmitting signals processed by the device to a high-frequency partial discharge detector or a relative dielectric loss tester for analysis. The second metal shell 2-1 has a cylindrical shape with both ends open, and external threads are tapped on the outer walls of the upper and lower parts thereof, respectively.
The lower part of the second metal shell 2-1 is in threaded connection with the upper part of the first metal shell 1-1, a sealing ring 4 is arranged on the end surface of the connection, a cylindrical cavity is formed after the connection, and the high-frequency signal conditioning circuit board 2-4 and the low-frequency signal conditioning circuit board 2-5 are arranged in the cylindrical cavity; the other end of the high-frequency coaxial cable is connected with the input end of the high-frequency signal conditioning circuit board 2-4, and the output end of the high-frequency signal conditioning circuit board 2-4 is connected with the input end of the high-frequency BNC connector 2-2; the other end of the low-frequency signal wire is connected with the input end of the low-frequency signal conditioning circuit board 2-5, and the output end of the low-frequency signal conditioning circuit board 2-5 is connected with the input end of the low-frequency BNC connector 2-3.
The grounding metal cap 3 is in threaded connection with the upper part of the second metal shell 2-1, and when the BNC connector does not need wiring work, the grounding metal cap 3 is covered and used for sealing and waterproofing, and meanwhile, the interference of external signals can be shielded. When the BNC connector is covered, the BNC connector is connected with the grounding metal cap 3, so that the BNC connector is grounded.
In operation, if the end screen grounding cover 5 of the transformer is an internal thread, the sleeve end screen leading-out end 6 of the transformer extends into the end screen wiring end 1-2, and meanwhile, the first metal shell 1-1 is directly connected with the end screen grounding cover 5 in a threaded manner, so that the test can be started. If the end shield grounding cover 5 of the transformer is externally threaded, the first metal shell 1-1 is screwed with the end shield grounding cover 5 through an internal-external thread conversion member 7.
The crown spring is internally provided with a plurality of beryllium bronze springs and is connected with a diagonal line, the crown spring is elastic and telescopic, is suitable for bushing end screen leading-out ends with various sizes, allows hot plug, and has the characteristics of good applicability, high reliability, soft pulling force, small contact resistance, good conductivity, shock resistance, impact resistance, stability, firmness and the like compared with a common clamp structure.
The high-frequency partial discharge sensor adopts a special high-frequency magnetic core, and has the advantages of wide detection frequency band, high sensitivity and the like compared with the common Rogowski coil when the detection frequency band is 10kHz-60 MHz.
The high-frequency coaxial cable adopts a special high-frequency signal transmission line, and the high-frequency partial discharge signal detected by the high-frequency partial discharge sensor is transmitted to the signal processing circuit for analysis and processing, so that the transmission distance is short, and the signal attenuation is reduced.
The high-frequency signal conditioning circuit board and the low-frequency signal conditioning circuit board adopt special partial discharge signal processing circuits with low distortion, high-speed conversion and high sampling rate, and can directly perform signal modulation, amplification, A/D conversion, effective data extraction and the like on the electric signals output by the high-frequency sensor.
When the device is used, the sleeve end screen leading-out end of the capacitive sleeve is aligned with the center of the end screen wiring end in the signal acquisition module, the sleeve end screen leading-out end is reliably contacted with the internal crown spring through rotating the grounding screw thread, the first metal shell is reliably connected with the sleeve end screen grounding cover, the sleeve end screen leading-out end and the sleeve end screen grounding cover form a reliable grounding loop, a high-frequency partial discharge signal is detected through a high-frequency sensor sleeved on the grounding loop in a penetrating mode, and the shortest grounding path is formed under the condition that the original grounding mode is not changed.
Claims (1)
1. A capacitive sleeve end screen signal detection device comprises a signal acquisition device (1) and a signal processing device (2) which are connected through threads; the method is characterized in that:
the signal acquisition device (1) comprises a first metal shell (1-1), a terminal (1-2) of a last screen, a high-frequency partial discharge sensor (1-3) and a low-frequency dielectric loss sensor (1-4);
the first metal shell (1-1) and the end screen wiring terminal (1-2) are cylindrical, and the end screen wiring terminal (1-2) is positioned in the first metal shell (1-1) and is integrally washed with the first metal shell (1-1); the end screen wiring terminal (1-2) is connected with the first metal shell (1-1) through a connecting platform (1-5), one end of the end screen wiring terminal (1-2) is sealed by the connecting platform (1-5), and an annular cavity is formed between the end screen wiring terminal (1-2) and the first metal shell (1-1);
the annular cavity is internally provided with a horizontal annular baffle (1-6) made of insulating materials, the annular cavity is divided into two spaces by the horizontal annular baffle (1-6), and a high-frequency partial discharge sensor (1-3) and a low-frequency dielectric loss sensor (1-4) are respectively arranged in the two spaces and sleeved on a terminal (1-2) of the end screen through a core; one end of the high-frequency coaxial cable is connected with the high-frequency partial discharge sensor (1-3), and one end of the low-frequency signal wire is connected with the low-frequency dielectric loss sensor (1-4);
the inner wall of the upper part of the first metal shell (1-1) is provided with internal threads, and the outer wall of the lower part is provided with external threads; a crown spring (1-7) for fixing the sleeve end screen leading-out end is arranged in the end screen wiring end (1-2);
the signal processing device (2) comprises a second metal shell (2-1), a high-frequency BNC connector (2-2), a low-frequency BNC connector (2-3), a high-frequency signal conditioning circuit board (2-4) and a low-frequency signal conditioning circuit board (2-5); a horizontal partition board (2-6) is arranged in the second metal shell (2-1), and the second metal shell (2-1) and the horizontal partition board (2-6) are integrally washed; the high-frequency BNC connector (2-2) and the low-frequency BNC connector (2-3) are arranged on the horizontal partition board (2-6) side by side, and one end of the high-frequency BNC connector penetrates through the horizontal partition board (2-6) to be arranged for transmitting the signals processed by the device to a high-frequency partial discharge detector or a relative dielectric loss tester for analysis; the second metal shell (2-1) is cylindrical with two open ends, and external threads are respectively tapped on the outer walls of the upper part and the lower part of the second metal shell;
the lower part of the second metal shell (2-1) is in threaded connection with the upper part of the first metal shell (1-1), a sealing ring (4) is arranged on the end surface of the connection, a cylindrical cavity is formed after the connection, and a high-frequency signal conditioning circuit board (2-4) and a low-frequency signal conditioning circuit board (2-5) are arranged in the cylindrical cavity; the other end of the high-frequency coaxial cable is connected with the input end of the high-frequency signal conditioning circuit board (2-4), and the output end of the high-frequency signal conditioning circuit board (2-4) is connected with the input end of the high-frequency BNC connector (2-2); the other end of the low-frequency signal wire is connected with the input end of the low-frequency signal conditioning circuit board (2-5), and the output end of the low-frequency signal conditioning circuit board (2-5) is connected with the input end of the low-frequency BNC connector (2-3);
the grounding metal cap (3) is in threaded connection with the upper part of the second metal shell (2-1), and when the high-frequency BNC connector (2-2) and the low-frequency BNC connector (2-3) are connected with the grounding metal cap (3) during covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710883253.1A CN107831410B (en) | 2017-09-26 | 2017-09-26 | Capacitive sleeve end screen signal detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710883253.1A CN107831410B (en) | 2017-09-26 | 2017-09-26 | Capacitive sleeve end screen signal detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107831410A CN107831410A (en) | 2018-03-23 |
| CN107831410B true CN107831410B (en) | 2023-05-30 |
Family
ID=61643540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710883253.1A Active CN107831410B (en) | 2017-09-26 | 2017-09-26 | Capacitive sleeve end screen signal detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107831410B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710005B (en) * | 2018-06-12 | 2020-11-03 | 广东电网有限责任公司广州供电局 | Dielectric loss partial discharge sensor structure and capacitive high-voltage electrical equipment detection mechanism |
| CN110568229A (en) * | 2019-09-10 | 2019-12-13 | 国网安徽省电力有限公司 | 220KV current transformer bushing end screen signal pickup device |
| CN111141961A (en) * | 2019-12-06 | 2020-05-12 | 国网冀北电力有限公司电力科学研究院 | Sensor and transformer bushing monitoring system |
| CN111722038B (en) * | 2020-06-18 | 2022-11-29 | 浙江省开化七一电力器材有限责任公司 | Shielding sleeve detection device |
| CN114167184B (en) * | 2021-12-06 | 2024-01-23 | 国网新疆电力有限公司电力科学研究院 | Sleeve and transformer end screen online monitoring networking system and method based on Internet of things |
| CN114755544A (en) * | 2022-05-07 | 2022-07-15 | 国网新疆电力有限公司电力科学研究院 | All-in-one sensing device for transformer bushing tap monitoring |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846719A (en) * | 2009-11-25 | 2010-09-29 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN103257306A (en) * | 2012-10-25 | 2013-08-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2693008B2 (en) * | 1990-02-28 | 1997-12-17 | 株式会社東芝 | Partial discharge detector for gas insulated equipment |
| JP2008216145A (en) * | 2007-03-06 | 2008-09-18 | Tokyo Electric Power Co Inc:The | Partial discharge detection method |
| CN101329382A (en) * | 2007-06-19 | 2008-12-24 | 上海蓝波高电压技术设备有限公司 | High voltage non-local discharge test power supply for crosslinked cable |
| CN202083770U (en) * | 2011-06-07 | 2011-12-21 | 国电南瑞科技股份有限公司 | Local discharge monitoring device of transformer |
| CN102540034B (en) * | 2012-03-16 | 2014-05-28 | 甘肃电力科学研究院 | High-voltage transformer bushing tap grounding on-line monitoring device |
| CN202600100U (en) * | 2012-03-16 | 2012-12-12 | 甘肃电力科学研究院 | On-line monitoring device of high-voltage transformer bushing tap grounding |
| CN202693625U (en) * | 2012-06-26 | 2013-01-23 | 云南电力试验研究院（集团）有限公司电力研究院 | Multifunctional sleeve end screen wire clamp |
| CN204925278U (en) * | 2015-08-21 | 2015-12-30 | 华北电力大学 | Multi -functional transformer bushing on -line monitoring sensor |
| CN105137152A (en) * | 2015-08-21 | 2015-12-09 | 华北电力大学 | Ground lead current signal monitoring sensor for end screen of transformer bushing |
| CN105810390B (en) * | 2016-04-06 | 2018-06-12 | 西安思坦环境科技有限公司 | A kind of dry-type transformer bottom shielding of bushing ejector |
-
2017
- 2017-09-26 CN CN201710883253.1A patent/CN107831410B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846719A (en) * | 2009-11-25 | 2010-09-29 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN103257306A (en) * | 2012-10-25 | 2013-08-21 | 国网电力科学研究院武汉南瑞有限责任公司 | Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107831410A (en) | 2018-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107831410B (en) | Capacitive sleeve end screen signal detection device | |
| WO2020125090A1 (en) | Transformer monitoring system and method | |
| CN108427068A (en) | A kind of partial discharge of switchgear detection device and method | |
| CN110850222A (en) | Electromagnetic compatibility performance testing system of new energy automobile motor driving system | |
| CN107907806B (en) | Bus voltage measuring device based on GIS basin-type insulator distributed capacitance | |
| CN203658526U (en) | Live-line detection device used for partial discharging of distribution cable | |
| CN204740272U (en) | Passive probe | |
| CN202583397U (en) | A partial discharge monitoring and positioning system of high-tension switch cabinet | |
| CN107807311B (en) | High-frequency partial discharge signal detection device for capacitive sleeve | |
| CN106785696B (en) | Triaxial cable connection assembly for an off-stack nuclear testing system of a nuclear reactor | |
| CN211505732U (en) | Electromagnetic compatibility performance testing device of new energy automobile motor driving system | |
| CN107422231B (en) | transformer ultrahigh frequency partial discharge detection device | |
| CN108152726B (en) | Intelligent electric power instrument and high-voltage switch cabinet for on-line monitoring mechanical state of circuit breaker | |
| CN207557408U (en) | High voltage capacitive apparatus insulated on-line monitoring system based on divider | |
| CN110568229A (en) | 220KV current transformer bushing end screen signal pickup device | |
| CN203630191U (en) | Current sampling device used for transformer bushing end screen | |
| CN203164353U (en) | Head dismantling-free transformer medium spectrum testing structure | |
| CN203232124U (en) | Grounding state alarm device for transformer bushing tap | |
| CN202178471U (en) | Cable connector for built-in coupler and coupler thereof | |
| CN103630811A (en) | Digital partial discharge detecting system | |
| CN102841245A (en) | Device for detecting end screen current parameter of high-voltage transformer bushing in real time, and control method for device | |
| CN209513975U (en) | A kind of authentic partial discharge monitoring device of switchgear | |
| CN207249048U (en) | Capacitive bottom shielding of bushing signal supervisory instrument | |
| CN113777453A (en) | Integrated sensor | |
| CN206178089U (en) | Separable capacitive sensor device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |