CN110907780A - Method and device for on-line detection of partial discharge in terminal - Google Patents
Method and device for on-line detection of partial discharge in terminal Download PDFInfo
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- CN110907780A CN110907780A CN201911387594.5A CN201911387594A CN110907780A CN 110907780 A CN110907780 A CN 110907780A CN 201911387594 A CN201911387594 A CN 201911387594A CN 110907780 A CN110907780 A CN 110907780A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 238000003745 diagnosis Methods 0.000 claims abstract description 5
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims 1
- 208000028659 discharge Diseases 0.000 description 29
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 238000002474 experimental method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- G01R31/1209—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 using acoustic measurements
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- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
本发明提供一种在线检测终端头内局部放电方法及装置，所述方法包括获取电缆终端头的内部温度、高频脉冲电磁信号、接地电流和超声波数据；将电缆终端头的内部温度、高频率脉冲电磁信号的频率、接地电流和超声波数据分别与预设温度范围、预设高频率脉冲电磁信号的频率范围、接地电流范围和超声波数据范围进行比较；当电缆终端头的内部温度、高频率脉冲电磁信号的频率、接地电流和超声波数据中任一数据超出预设温度范围、预设高频率脉冲电磁信号的频率范围、接地电流范围和超声波数据范围，诊断确定电缆终端头异常放电。本发明通过多种传感器检测局部放电，解决了现有电缆终端头安装好后无合适办法检测以及环境干扰严重无法检测的问题。
The invention provides a method and device for online detection of partial discharge in a terminal head. The method includes acquiring the internal temperature, high-frequency pulse electromagnetic signal, grounding current and ultrasonic data of the cable terminal head; The frequency, grounding current and ultrasonic data of the pulsed electromagnetic signal are compared with the preset temperature range, the frequency range of the preset high-frequency pulsed electromagnetic signal, the grounding current range and the ultrasonic data range respectively; If any of the frequency of the electromagnetic signal, the grounding current and the ultrasonic data exceeds the preset temperature range, the frequency range of the preset high-frequency pulse electromagnetic signal, the grounding current range and the ultrasonic data range, the diagnosis determines that the cable terminal is abnormally discharged. The invention detects the partial discharge through a variety of sensors, and solves the problems that there is no suitable method for detection after the existing cable terminal is installed and the environment interference is serious and cannot be detected.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a device for detecting partial discharge in a terminal on line.
Background
In a power network, partial discharge of a cable terminal occurs, partial discharge detection is generally used before and during installation, no proper method is used for detection after complete installation, and the situation that detection cannot be performed can also occur when environmental interference is serious.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method and a device for online detection of partial discharge in a terminal.
The invention provides a method for detecting partial discharge in a terminal on line, which comprises the following steps:
acquiring internal temperature, high-frequency pulse electromagnetic signals, grounding current and ultrasonic data of a cable terminal, wherein the high-frequency pulse electromagnetic signals comprise frequency and peak values of the high-frequency pulse electromagnetic signals, and the ultrasonic data comprise ultrasonic frequency, peak values and waveforms;
comparing the internal temperature of the cable terminal, the high-frequency pulsed electromagnetic signal, the ground current and the ultrasonic data with a preset temperature range, a preset high-frequency pulsed electromagnetic signal, a preset ground current range and a preset ultrasonic data range respectively;
and when any data of the internal temperature of the cable terminal head, the high-frequency pulse electromagnetic signal, the grounding current and the ultrasonic data exceeds a preset temperature range, a preset high-frequency pulse electromagnetic signal range, a preset grounding current range and a preset ultrasonic data range, diagnosing and determining abnormal discharge of the cable terminal head.
Further, the step of obtaining the internal temperature of the cable termination comprises:
and arranging a temperature sensor inside the cable terminal, and acquiring the internal temperature of the cable terminal by using the temperature sensor.
Further, the step of obtaining the high-frequency pulse electromagnetic signal of the cable terminal comprises:
and arranging an antenna on the outer layer of the cable terminal, connecting the antenna with an electromagnetic sensor, and acquiring the high-frequency pulse electromagnetic signal.
Further, the step of obtaining the grounding current of the cable terminal comprises:
and sleeving a mutual inductor on the outer layer of the grounding wire of the cable terminal to detect the grounding current.
Further, the step of acquiring ultrasonic data of the cable termination head includes:
and arranging an ultrasonic sensor on a sleeve matched with the cable terminal head, and detecting the ultrasonic data.
The invention provides an on-line detection terminal internal partial discharge device, which comprises:
the cable terminal comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the internal temperature of the cable terminal, a high-frequency pulse electromagnetic signal, grounding current and ultrasonic data, the high-frequency pulse electromagnetic signal comprises the frequency and the peak value of the high-frequency pulse electromagnetic signal, and the ultrasonic data comprises the ultrasonic frequency, the peak value and the waveform;
a comparing unit for comparing the internal temperature of the cable terminal, the high-frequency pulse electromagnetic signal, the ground current and the ultrasonic data with a preset temperature range, a preset high-frequency pulse electromagnetic signal, a preset ground current range and a preset ultrasonic data range, respectively;
and the diagnosis unit is used for diagnosing and determining abnormal discharge of the cable terminal when any one of the internal temperature of the cable terminal, the high-frequency pulse electromagnetic signal, the grounding current and the ultrasonic data exceeds a preset temperature range, a preset high-frequency pulse electromagnetic signal, a preset grounding current range and a preset ultrasonic data range.
Furthermore, the acquisition unit comprises a first acquisition module, the first acquisition module is used for arranging a temperature sensor inside the cable terminal, and the temperature sensor is used for acquiring the internal temperature of the cable terminal.
Furthermore, the acquisition unit comprises a second acquisition module, the second acquisition module is used for arranging an antenna on the outer layer of the cable terminal, and the antenna is connected with the electromagnetic sensor to acquire the high-frequency pulse electromagnetic signal.
Furthermore, the acquisition unit comprises a third acquisition module, and the third acquisition module is used for sleeving a mutual inductor on the outer layer of the grounding wire of the cable terminal to detect the grounding current.
Further, the acquisition unit comprises a fourth acquisition module, and the fourth acquisition module is used for arranging an ultrasonic sensor on a sleeve matched with the cable terminal head and detecting the ultrasonic data.
The implementation of the invention has the following beneficial effects:
according to the invention, various methods for monitoring partial discharge are comprehensively used, when any index exceeds a preset range, the problem of partial discharge is confirmed, and the problems that the existing partial discharge detection cannot be detected after being completely installed and the environmental interference is serious are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for online detecting partial discharge in a terminal according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a partial discharge device in an online detection terminal according to an embodiment of the present invention.
Detailed Description
The core content of the patent is that a plurality of partial discharge modes are comprehensively utilized, temperature, electromagnetic signals, grounding current and ultrasonic data are acquired through a sensor, partial discharge is diagnosed through any data, and specific implementation modes of the method and the device are further explained in combination with the attached drawings and the embodiment.
As shown in fig. 1, an embodiment of the present invention provides a method for online detecting a partial discharge in a terminal, where the method includes:
s11, acquiring the internal temperature of the cable terminal, a high-frequency pulse electromagnetic signal, grounding current and ultrasonic data, wherein the high-frequency pulse electromagnetic signal comprises the frequency and the peak value of the high-frequency pulse electromagnetic signal, and the ultrasonic data comprises the ultrasonic frequency, the peak value and the waveform.
It should be noted that, according to experimental data, when the cable runs stably (the cable runs stably including environment fixation, current fixation and load fixation), the temperature is a stable value; by measuring the temperature of the cable in stable operation under different environments, a temperature database can be established when the cable is stable.
When partial discharge occurs in the cable terminal, the high-frequency pulse electromagnetic signal is released, through tests, samples with different discharge amounts are adopted, the frequency and the peak value of the high-frequency pulse electromagnetic signal are measured, a high-frequency pulse electromagnetic signal database is established, and the partial discharge condition in the cable terminal is judged through comparing the measured data with the high-frequency pulse electromagnetic signal database.
When partial discharge occurs in the cable terminal, the distributed capacitance of the outer semi-conductive layer and the wire core of the cable terminal is increased, and the dielectric constant of the insulating layer is changed, so that the grounding current is increased accordingly.
Through tests, by adopting test articles with different discharge quantities, the frequency, the peak value and the waveform of ultrasonic waves released by the cable terminal under corresponding conditions are measured, an ultrasonic database is established, and the condition of partial discharge in the cable terminal is judged by monitoring the collected high-frequency sound waves through an ultrasonic sensor and comparing the high-frequency sound waves with the database.
And S12, comparing the internal temperature, the high-frequency pulse electromagnetic signal, the grounding current and the ultrasonic data of the cable terminal with a preset temperature range, a preset high-frequency pulse electromagnetic signal range, a preset grounding current range and a preset ultrasonic data range respectively.
It should be noted that the preset temperature range, the preset high-frequency pulse electromagnetic signal, the preset ground current range and the preset ultrasonic data range are data obtained through experiments.
And S13, when any data of the internal temperature, the high-frequency pulse electromagnetic signal, the grounding current and the ultrasonic data of the cable terminal exceeds a preset temperature range, a preset high-frequency pulse electromagnetic signal range, a preset grounding current range and a preset ultrasonic data range, diagnosing and determining abnormal discharge of the cable terminal.
Any data exceeding range can diagnose the abnormal discharge of the cable terminal, so that the missing of partial discharge caused by a single means is avoided, different diagnosis means are suitable for being implemented at different parts of the cable terminal, and the success rate of partial discharge detection is improved.
Further, the step S11 includes:
and arranging a temperature sensor inside the cable terminal, and acquiring the internal temperature of the cable terminal by using the temperature sensor.
Further, the step S11 includes:
and arranging an antenna on the outer layer of the cable terminal, connecting the antenna with an electromagnetic sensor, and acquiring the high-frequency pulse electromagnetic signal.
Further, the step S11 includes:
and sleeving a mutual inductor on the outer layer of the grounding wire of the cable terminal to detect the grounding current.
Further, the step S11 includes:
and arranging an ultrasonic sensor on a sleeve matched with the cable terminal head, and detecting the ultrasonic data.
As shown in fig. 2, an embodiment of the present invention provides an apparatus for online detecting a partial discharge in a terminal, where the apparatus includes:
an acquiring unit 21 configured to acquire an internal temperature of the cable terminal, a high-frequency pulsed electromagnetic signal, a ground current, and ultrasonic data, the high-frequency pulsed electromagnetic signal including a frequency and a peak of the high-frequency pulsed electromagnetic signal, the ultrasonic data including an ultrasonic frequency, a peak, and a waveform;
a comparing unit 22, configured to compare the internal temperature, the high-frequency pulsed electromagnetic signal, the ground current, and the ultrasonic data of the cable terminal with a preset temperature range, a preset high-frequency pulsed electromagnetic signal range, a preset ground current range, and a preset ultrasonic data range, respectively;
the diagnosis unit 23 is configured to diagnose and determine that the cable terminal is abnormally discharged when any one of the internal temperature of the cable terminal, the high-frequency pulsed electromagnetic signal, the ground current, and the ultrasonic data exceeds a preset temperature range, a preset high-frequency pulsed electromagnetic signal range, a preset ground current range, and a preset ultrasonic data range.
Further, the acquiring unit 21 includes a first acquiring module 211, where the first acquiring module 211 is configured to set a temperature sensor inside the cable terminal, and acquire an internal temperature of the cable terminal by using the temperature sensor.
Further, the obtaining unit 21 includes a second collecting module 212, where the second collecting module 212 is configured to set an antenna on an outer layer of the cable terminal, connect the antenna with an electromagnetic sensor, and obtain the high-frequency pulse electromagnetic signal.
Further, the obtaining unit 21 includes a third collecting module 213, where the third collecting module 213 is configured to sleeve a transformer on an outer layer of a ground wire of the cable terminal to detect the ground current.
Further, the acquiring unit 21 includes a fourth acquiring module 214, and the fourth acquiring module 214 is configured to dispose an ultrasonic sensor on a sleeve mated with the cable terminal to detect the ultrasonic data.
The implementation of the invention has the following beneficial effects:
according to the invention, various methods for monitoring partial discharge are comprehensively used, when any index exceeds a preset range, the problem of partial discharge is confirmed, and the problems that the existing partial discharge detection cannot be detected after being completely installed and the environmental interference is serious are solved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387594.5A CN110907780A (en) | 2019-12-30 | 2019-12-30 | Method and device for on-line detection of partial discharge in terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387594.5A CN110907780A (en) | 2019-12-30 | 2019-12-30 | Method and device for on-line detection of partial discharge in terminal |
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| CN110907780A true CN110907780A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911387594.5A Pending CN110907780A (en) | 2019-12-30 | 2019-12-30 | Method and device for on-line detection of partial discharge in terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118980895A (en) * | 2024-08-20 | 2024-11-19 | 深圳供电局有限公司 | A ring main unit partial discharge monitoring system, method, device and medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| CN103645420A (en) * | 2013-12-09 | 2014-03-19 | 武汉中旭科技有限公司 | Power cable online monitoring system |
| CN205647024U (en) * | 2016-03-28 | 2016-10-12 | 福建南平太阳电缆股份有限公司 | Long -range on -line monitoring device of cable |
| CN110161386A (en) * | 2019-05-06 | 2019-08-23 | 贵州电网有限责任公司 | A kind of portable high-pressure cable connector local discharge detection device and method |
-
2019
- 2019-12-30 CN CN201911387594.5A patent/CN110907780A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1834673A (en) * | 2006-03-06 | 2006-09-20 | 西安交通大学 | Insulating state on-line monitoring method of cross-linked PE cable |
| CN103645420A (en) * | 2013-12-09 | 2014-03-19 | 武汉中旭科技有限公司 | Power cable online monitoring system |
| CN205647024U (en) * | 2016-03-28 | 2016-10-12 | 福建南平太阳电缆股份有限公司 | Long -range on -line monitoring device of cable |
| CN110161386A (en) * | 2019-05-06 | 2019-08-23 | 贵州电网有限责任公司 | A kind of portable high-pressure cable connector local discharge detection device and method |
Non-Patent Citations (1)
| Title |
|---|
| 曹俊平: "XLPE电力电缆接头缺陷检测关键技术分析与展望", 《高压电器》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118980895A (en) * | 2024-08-20 | 2024-11-19 | 深圳供电局有限公司 | A ring main unit partial discharge monitoring system, method, device and medium |
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Application publication date: 20200324 |