CN114280432B - Cable partial discharge monitoring equipment and method - Google Patents
Cable partial discharge monitoring equipment and method Download PDFInfo
- Publication number
- CN114280432B CN114280432B CN202111407197.7A CN202111407197A CN114280432B CN 114280432 B CN114280432 B CN 114280432B CN 202111407197 A CN202111407197 A CN 202111407197A CN 114280432 B CN114280432 B CN 114280432B
- Authority
- CN
- China
- Prior art keywords
- phase
- cable
- pass filter
- sampling
- low
- 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
Abstract
The invention relates to a cable partial discharge monitoring device and a method, wherein the cable partial discharge monitoring device comprises: the sampling chip supports four-channel low-speed sampling and switching to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip and comprises three low-pass filter circuits, one high-pass filter circuit and a 50Hz low-pass filter circuit; the three gates are respectively and electrically connected with the three low-pass filter circuits, the high-pass filter circuit is electrically connected with the three gates, and the 50Hz low-pass filter circuit is electrically connected with the gates corresponding to the A of the cable; the number of the HFCT sensors is three, the HFCT sensors are electrically connected with the three gates in a one-to-one correspondence manner, and the HFCT sensors are respectively sleeved on the A phase, the B phase and the C phase of the cable. The invention uses three low-pass filter circuits to sample phase A, phase B and phase C at the same time and at low frequency, the high-pass filter circuit samples one phase at high frequency, and the 50Hz low-pass filter circuit samples the 50Hz alternating current signal of phase A, thus the sampling effect is good.
Description
Technical Field
The invention relates to the field of cable partial discharge monitoring, in particular to a cable partial discharge monitoring device and a method.
Background
The cable is visible everywhere in daily production and life, and along with the increase of dependence of people on electricity, the occurrence probability of accidents is correspondingly increased. One of the main causes of cable accidents is the presence of defects in the insulating parts of the cable, which create partial discharges that accelerate the deterioration of the insulating properties of the cable, eventually leading to breakdown of the cable. The existing partial discharge acquisition scheme mainly has the following 3 problems:
1. if both sampling chips of 400Mhz are used, the power consumption is great. If sampling chips of 100Mhz are used, more accurate sampling at high frequencies cannot be achieved. If separate 4 sampling chips are used, it is difficult to implement synchronous sampling techniques. The chip with variable channels and sampling rate can well solve the problems of power consumption and performance, and can realize synchronous sampling.
2. The traditional original signals are directly input into a sampling chip, which is not beneficial to signal processing of each frequency band. Aiming at the problem, a circuit which adopts matched filtering at the input front end of different sampling rates is specially designed.
3. The traditional partial discharge needs current phase alignment, and only can acquire a current signal by means of an additional transformer, so that the additional transformer and the rogowski coil are required to be additionally arranged. Through analysis and practice, the 50hz phase signal can be obtained by adopting the method that the partial discharge signal firstly passes through an integrating circuit and then passes through 50hz low-frequency filtering, and the specific 50hz current signal current value can not be restored, but the partial discharge phase analysis processing is used.
Disclosure of Invention
The invention aims to provide cable partial discharge monitoring equipment which has the characteristics of good sampling effect and the like and has good applicability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a cable partial discharge monitoring device for monitoring partial discharge of a cable, comprising: the sampling chip supports four-channel low-speed sampling and switching to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip and comprises three low-pass filter circuits, one high-pass filter circuit and a 50Hz low-pass filter circuit; the three gates are respectively and electrically connected with the three low-pass filter circuits, the high-pass filter circuit is electrically connected with the three gates, and the 50Hz low-pass filter circuit is electrically connected with the gates corresponding to the A of the cable; the number of the HFCT sensors is three, the HFCT sensors are electrically connected with the three gates in a one-to-one correspondence manner, and the HFCT sensors are respectively sleeved on the A phase, the B phase and the C phase of the cable.
Preferably, signals of the A phase, the B phase and the C phase of the cable enter the sampling chip through the corresponding HFCT sensor, the corresponding gating device and the corresponding low-pass filter circuit, and the sampling chip synchronously samples the signals of the A phase, the B phase and the C phase of the cable by adopting a four-way synchronous sampling technology.
Preferably, the signal of the cable a phase or the signal of the cable B phase or the signal of the cable C phase enter the sampling chip through the corresponding HFCT sensor, the corresponding gate and the corresponding high-pass filter circuit, and the sampling chip adopts a single-path high-speed sampling technology to sample the signal of the cable a phase or the signal of the cable B phase or the signal of the cable C phase.
Preferably, the filtering frequency of the low-pass filtering circuit is 500 k-5 MHz; the filtering frequency of the high-pass filtering circuit is 5M-30 MHz.
Preferably, the sampling rate of the high-frequency sampling of the sampling chip is 400MHz; the sampling rate of the low-frequency synchronous sampling of the sampling chip is 100MHz.
Preferably, the filter circuit further comprises an integrating circuit, the integrating circuit is electrically connected with the gating device corresponding to the phase A of the cable, the 50Hz low-pass filter circuit is connected with the integrating circuit, and the sampling chip acquires the 50Hz alternating current signal of the phase A of the cable through the 50Hz low-pass filter circuit and the integrating circuit.
The invention also provides a cable partial discharge monitoring method, which comprises the cable partial discharge monitoring equipment and comprises the following steps:
the first step: the three HFCT sensors are respectively connected with an A phase, a B phase and a C phase of the cable;
and a second step of: the three low-pass filter circuits synchronously sample signals of A phase, B phase and C phase of the cable at low frequency;
and a third step of: calculating average values of sampling data of A phase, B phase and C phase signals of the cable, comparing the average values with the sampling data of the A phase, B phase and C phase signals of the cable, and obtaining an A average difference value, a B average difference value and a C average difference value respectively;
fourth step: judging whether the A average difference value, the B average difference value and the C average difference value are higher than a standard value, if yes, switching a gating device corresponding to the average difference value higher than the standard value into a high-pass filter circuit, and performing high-frequency sampling by the high-pass filter circuit to calculate a high-frequency signal component;
fifth step: and judging whether the high-frequency signal component and the average difference value are higher than the standard value, and if so, judging that the signal is a partial discharge signal.
Preferably, when the sampling chip synchronously samples, one channel acquires a 50Hz alternating current signal of the A phase of the cable; and the other three channels synchronously sample the phase A, the phase B and the phase C of the cable at low frequency, calculate the corresponding partial discharge quantity, and periodically align with an alternating current signal of 50Hz to draw a phase-discharge quantity map.
Preferably, multiple discharge signals of each phase are recorded and partial discharge is plotted according to the alternating current phase alignment principleAnd (5) a map.
Compared with the prior art, the invention has the beneficial effects that:
according to the cable partial discharge monitoring device provided by the technical scheme, the sampling chip comprises the high-pass filter circuit and the three low-pass filter circuits, the three gates are respectively connected with the three low-pass filter circuits in a one-to-one correspondence manner, the high-pass filter circuits are electrically connected with the three gates, the three HFCT sensors are respectively connected with the three gates in a one-to-one correspondence manner, and the three HFCT sensors are respectively connected with the A phase, the B phase and the C phase of the cable. The three low-pass filter circuits can synchronously sample phases A, B and C of the cable at low frequency, judge whether the average difference value of one or more phases of the phases A, B and C is higher than a standard value, if so, switch the corresponding gating device into the high-pass filter circuit, perform high-frequency sampling by the high-pass filter circuit, calculate a high-frequency signal component, and judge whether the high-frequency signal component is higher than the standard value. The cable partial discharge monitoring equipment can remove interference signals through double analysis, can realize synchronous sampling of A phase, B phase and C phase and high-frequency sampling of one phase, and has a good sampling effect.
Drawings
Fig. 1 is a schematic diagram of a cable partial discharge monitoring device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the original signals of the cable.
Fig. 3 is a schematic diagram of a low frequency signal.
Fig. 4 is a schematic diagram of a high frequency signal.
Fig. 5 is a schematic diagram of an integrated signal.
Fig. 6 is a schematic diagram of a 50hz phase signal.
Fig. 7 is a schematic diagram of an integrating circuit.
Fig. 8 is a schematic diagram of a low pass filter circuit.
Fig. 9 is a schematic diagram of a high pass filter circuit.
1. A cable; 2. a sampling chip; 3. a gating device; 4. an HFCT sensor; 51. a low pass filter circuit; 52. a high-pass filter circuit; 53. an integrating circuit; 54. a 50Hz low pass filter circuit.
Detailed Description
The invention will now be described in more detail with reference to the accompanying drawings, to which it should be noted that the description is given by way of illustration only and not by way of limitation. Various embodiments may be combined with one another to form further embodiments not shown in the following description.
Referring to fig. 1, in an embodiment of the present invention, a cable partial discharge monitoring device is provided, including: a sampling chip 2, a gate 3 and an HFCT sensor 4.
The sampling chip 2 supports four-channel low-speed sampling and is switched to one-channel high-speed sampling; the filter circuit is electrically connected with the sampling chip 2 and comprises three paths of low-pass filter circuits 51, one path of high-pass filter circuits 52 and a 50Hz low-pass filter circuit 54; the number of the gates 3 is three, the three gates 3 are respectively and electrically connected with three low-pass filter circuits 51, the high-pass filter circuit 52 is electrically connected with the three gates 3, and the 50Hz low-pass filter circuit 54 is electrically connected with the gates 3 corresponding to A of the cable 1; the number of the HFCT sensors 4 is three, the HFCT sensors are electrically connected with the three gates 3 in a one-to-one correspondence manner, and the three HFCT sensors 4 are respectively sleeved on the A phase, the B phase and the C phase of the cable 1.
In a preferred embodiment, the sampling chip 2 comprises four channels. The sampling chip 2 supports four-channel low-speed sampling and switching to one-channel high-speed sampling. Wherein three channels are respectively connected with the three low-pass filter circuits 51 in a one-to-one correspondence manner, and the other channel is connected with the high-pass filter circuit 52 and the 50Hz low-pass filter circuit 54.
The three gates 3 are respectively connected with the three low-pass filter circuits 51 in a one-to-one correspondence, the high-pass filter circuit 52 is connected with the three gates 3, and the 50Hz low-pass filter circuit 54 is connected with the gates 3 corresponding to A of the cable 1.
The four channels all support 100MHz sampling frequency. One of the channels also supports a 400MHz sampling frequency.
The filtering frequency of the low-pass filter circuit 51 is 500 k-5M; the high pass filter circuit 52 has a filter frequency of 5M to 30M.
More preferably, three HFCT sensors 4 are connected to the a phase, the B phase and the C phase of the cable 1, respectively, and three gates 3 are connected to the three HFCT sensors 4 in a one-to-one correspondence.
Referring to fig. 2-9, the conventional partial discharge is an occasional phenomenon, and the phase a, the phase B and the phase C of the cable 1 do not occur simultaneously, so if the sampling chip 2 monitors signals of the phase a, the phase B and the phase C of the cable 1 simultaneously, the signals are interference signals. The cable partial discharge monitoring device provided by the invention can eliminate the interference signal, and specifically comprises the following components:
the three channels may perform synchronous low-frequency sampling on signals of the a phase, the B phase and the C phase of the cable 1 by using the three low-pass filter circuits 51, calculate average values of sampling data of the a phase, the B phase and the C phase of the cable 1 sampled at the same time, compare the average values with sampling data of the a phase, the B phase and the C phase of the cable 1, and obtain an a average difference value, a B average difference value and a C average difference value. And comparing the A average difference value, the B average difference value and the C average difference value with a standard value, and if the A average difference value, the B average difference value or the C average difference value is higher than the standard value, the signal of the A phase, the B phase or the C phase corresponding to the average difference value is a high-frequency signal.
Then, the gating device 3 corresponding to the a phase, the B phase or the C phase, the average difference value of which is higher than the standard value, is cut into the high-pass filter circuit 52, the high-pass filter circuit 52 performs high-frequency sampling, calculates a high-frequency signal component, and compares the high-frequency signal component with the corresponding standard value. If the average value of a, the average value of B, or the average value of C is higher than the corresponding standard value, and the high-frequency signal component obtained by the high-frequency sampling by the high-pass filter circuit 52 is also higher than the corresponding standard value, the signal can be determined to be a partial discharge signal. If only one or both conditions are met, the signal can be judged to be not a partial discharge signal but an interference signal, namely, the elimination of the interference signal is realized. Therefore, the cable partial discharge monitoring equipment provided by the invention can accurately monitor the partial discharge signal of the cable 1, and can remove interference signals, and has a good monitoring effect.
In a preferred embodiment, the filter circuit further comprises an integrating circuit 53, the integrating circuit 53 being connected to the gate 3 corresponding to a of the cable 1, the 50Hz low pass filter circuit 54 being connected to the integrating circuit 53. The sampling chip 2 performs low-frequency sampling on the phase a, the phase B and the phase C of the cable 1 through three paths of the low-pass filter circuits 51, performs high-frequency sampling on one phase of the cable 1 through the high-pass filter circuit 52, and obtains a 50Hz alternating current signal of the phase a of the cable 1 through the 50Hz low-pass filter circuit 54 and the integrating circuit 53.
The low-pass filter circuit 51 is used for separating the original signal into signals of 500K-5 MHz, and the 50Hz low-pass filter circuit 54 is used for separating the integrated signal into signals of 50 Hz. The high-pass filter circuit 52 is used for separating the original signal into signals of 5M-30 MHz.
The invention also provides a cable partial discharge monitoring method, which comprises the following steps:
the first step: the three HFCT sensors 4 are respectively sleeved on the A phase, the B phase and the C phase of the cable 1;
and a second step of: the three low-pass filter circuits 51 perform synchronous low-frequency sampling on signals of A phase, B phase and C phase of the cable 1;
and a third step of: calculating average values of sampling data of A phase, B phase and C phase signals of the cable 1, comparing the average values with the sampling data of the A phase, B phase and C phase signals of the cable 1, and obtaining an A average difference value, a B average difference value and a C average difference value respectively;
fourth step: judging whether the A average difference value, the B average difference value and the C average difference value are higher than a standard value, if yes, switching a gating device 3 corresponding to the average difference value higher than the standard value into a high-pass filter circuit 52, and performing high-frequency sampling by the high-pass filter circuit 52 to calculate a high-frequency signal component;
fifth step: and judging whether the high-frequency signal component and the average difference value are higher than the standard value, and if so, judging that the signal is a partial discharge signal.
When the sampling chip 2 synchronously samples, one channel acquires a 50Hz alternating current signal of the A phase of the cable; and the other three channels synchronously sample the phase A, the phase B and the phase C of the cable 1 at low frequency, calculate the corresponding partial discharge quantity, and periodically align with an alternating current electric signal of 50Hz to draw a phase-discharge quantity map.
Recording multiple discharge signals of each phase according to the alternating current phase alignment principle, and drawing partial dischargeAnd (5) a map.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (9)
1. A cable partial discharge monitoring device for monitoring partial discharge of a cable (1), characterized by comprising:
the sampling chip (2) supports four-channel low-speed sampling and supports switching to one-channel high-speed sampling;
the filter circuit is electrically connected with the sampling chip (2) and comprises three paths of low-pass filter circuits (51), one path of high-pass filter circuits (52) and a 50Hz low-pass filter circuit (54);
the three gates (3) are arranged, the three gates (3) are respectively and electrically connected with the three low-pass filter circuits (51), the high-pass filter circuit (52) is electrically connected with the three gates (3), and the 50Hz low-pass filter circuit (54) is electrically connected with the gates (3) corresponding to A of the cable (1);
the HFCT sensors (4) are arranged in three and are electrically connected with the three gates (3) in one-to-one correspondence, and the three HFCT sensors (4) are respectively sleeved on the A phase, the B phase and the C phase of the cable (1);
the three low-pass filter circuits (51) synchronously sample signals of A phase, B phase and C phase of the cable (1) at low frequency to obtain average values of sampling data of the signals of the A phase, the B phase and the C phase of the cable (1) and obtain an A average difference value, a B average difference value and a C average difference value respectively; and judging whether the A average difference value, the B average difference value and the C average difference value are higher than a standard value, and if so, switching a gating device (3) corresponding to the average difference value higher than the standard value into a high-pass filter circuit (52).
2. Cable partial discharge monitoring device according to claim 1, wherein the signals of the a-, B-and C-phases of the cable (1) enter the sampling chip (2) through the corresponding HFCT sensor (4), the gate (3) and the low-pass filter circuit (51), and the sampling chip (2) uses a four-way synchronous sampling technique to synchronously sample the signals of the a-, B-and C-phases of the cable (1).
3. Cable partial discharge monitoring device according to claim 1, wherein the signals of the a-phase or B-phase or C-phase of the cable (1) enter the sampling chip (2) through the corresponding HFCT sensor (4), the gate (3) and the high-pass filter circuit (52), and the sampling chip (2) samples the signals of the a-phase or B-phase or C-phase of the cable (1) using a single-pass high-speed sampling technique.
4. The cable partial discharge monitoring device according to claim 1, characterized in that the low-pass filter circuit (51) has a filter frequency of 500 k-5 MHz; the filtering frequency of the high-pass filter circuit (52) is 5M-30 MHz.
5. Cable partial discharge monitoring device according to claim 1, characterized in that the sampling rate of the high frequency sampling of the sampling chip (2) is 400MHz; the sampling rate of the low-frequency synchronous sampling of the sampling chip (2) is 100MHz.
6. The cable partial discharge monitoring device according to claim 1, wherein the filter circuit further comprises an integrating circuit (53), the integrating circuit (53) is electrically connected to the gate (3) corresponding to a of the cable (1), the 50Hz low-pass filter circuit (54) is connected to the integrating circuit (53), and the sampling chip (2) acquires a 50Hz alternating current signal of a phase of the cable (1) through the 50Hz low-pass filter circuit (54) and the integrating circuit (53).
7. A cable partial discharge monitoring method, characterized by comprising the cable partial discharge monitoring device according to any one of claims 1-6, and comprising the steps of:
the first step: the three HFCT sensors (4) are respectively sleeved on the A phase, the B phase and the C phase of the cable (1);
and a second step of: the three low-pass filter circuits (51) synchronously sample signals of A phase, B phase and C phase of the cable (1) at low frequency;
and a third step of: calculating average values of sampling data of A phase, B phase and C phase signals of the cable (1), wherein the average values are respectively compared with the sampling data of the A phase, B phase and C phase signals of the cable (1) and respectively obtain an A average difference value, a B average difference value and a C average difference value;
fourth step: judging whether the A average difference value, the B average difference value and the C average difference value are higher than a standard value, if yes, switching a gating device (3) corresponding to the average difference value higher than the standard value into a high-pass filter circuit (52), performing high-frequency sampling by the high-pass filter circuit (52), and calculating a high-frequency signal component;
fifth step: and judging whether the high-frequency signal component and the average difference value are higher than the standard value, and if so, judging that the signal is a partial discharge signal.
8. The cable partial discharge monitoring method according to claim 7, wherein when the sampling chip (2) synchronously samples, one channel acquires a 50Hz alternating current signal of phase a of the cable (1); and the three channels synchronously sample the A phase, the B phase and the C phase of the cable (1) at low frequency, calculate the corresponding partial discharge quantity, and periodically align with the 50Hz alternating current electric signal to draw a phase-discharge quantity map.
9. The cable partial discharge monitoring method of claim 8, wherein the multiple discharge signals of each phase are recorded and the partial discharge N-Q-phi map is plotted according to the alternating current phase alignment principle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111407197.7A CN114280432B (en) | 2021-11-24 | 2021-11-24 | Cable partial discharge monitoring equipment and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111407197.7A CN114280432B (en) | 2021-11-24 | 2021-11-24 | Cable partial discharge monitoring equipment and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114280432A CN114280432A (en) | 2022-04-05 |
| CN114280432B true CN114280432B (en) | 2023-10-13 |
Family
ID=80870282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111407197.7A Active CN114280432B (en) | 2021-11-24 | 2021-11-24 | Cable partial discharge monitoring equipment and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114280432B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5072230A (en) * | 1987-09-30 | 1991-12-10 | Fujitsu Ten Limited | Mobile telescoping whip antenna with impedance matched feed sections |
| WO2008106822A1 (en) * | 2007-03-06 | 2008-09-12 | Zongshan Zhou | Method for resistance combining double sampling loop negative feedback and amplifier thereof |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
| CN104007370A (en) * | 2014-05-13 | 2014-08-27 | 深圳供电局有限公司 | Sensor and method used for monitoring partial discharge of cable |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN104090219A (en) * | 2014-07-18 | 2014-10-08 | 国家电网公司 | Partial discharge high-frequency monitor of high-voltage cable terminals |
| CN105527549A (en) * | 2015-12-04 | 2016-04-27 | 重庆臻远电气有限公司 | Partial discharge data collection circuit and detection system |
| CN105548846A (en) * | 2016-02-01 | 2016-05-04 | 广州智丰电气科技有限公司 | Signal frequency conversion preposition module of portable intelligent four-channel partial discharge detector |
| CN205384348U (en) * | 2016-02-01 | 2016-07-13 | 广州智丰电气科技有限公司 | Portable intelligent four -channel partial discharge detection appearance signal frequency changes leading module |
| CN110176932A (en) * | 2018-02-21 | 2019-08-27 | 亚德诺半导体无限责任公司 | Time interleaving filtering in analog-digital converter |
| CN111077421A (en) * | 2019-12-30 | 2020-04-28 | 云南恒协科技有限公司 | Intelligent operation and detection system for cable line |
| CN211180052U (en) * | 2019-08-30 | 2020-08-04 | 咸亨国际（杭州）电气科技研究院有限公司 | Power cable partial discharge monitoring device using high-frequency current transformer |
| CN111830375A (en) * | 2020-07-01 | 2020-10-27 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Cable online monitoring device and method capable of positioning insulation defects |
| CN113009271A (en) * | 2021-04-22 | 2021-06-22 | 威胜集团有限公司 | Fault arc detection and positioning method, device and computer readable storage medium |
| CN113064035A (en) * | 2021-04-06 | 2021-07-02 | 哈尔滨理工大学 | High-frequency partial discharge signal detection system |
| CN113156196A (en) * | 2021-04-27 | 2021-07-23 | 广西电网有限责任公司桂林供电局 | Electronic transformer-based high-frequency sampling intelligent sensing terminal and implementation method |
| JP2021113726A (en) * | 2020-01-17 | 2021-08-05 | Ｊｆｅスチール株式会社 | Diagnosis method and device of rotary bearing |
| WO2021198146A1 (en) * | 2020-03-31 | 2021-10-07 | Baur Gmbh | Electrical circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2422967B (en) * | 2003-10-22 | 2007-06-06 | Fujikura Ltd | Insulation degradation diagnostic device |
| US10454724B2 (en) * | 2017-02-23 | 2019-10-22 | Skyworks Solutions, Inc. | Multipath filters |
| JP7130542B2 (en) * | 2018-12-12 | 2022-09-05 | 株式会社日立製作所 | Partial discharge detection device and partial discharge detection method |
-
2021
- 2021-11-24 CN CN202111407197.7A patent/CN114280432B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5072230A (en) * | 1987-09-30 | 1991-12-10 | Fujitsu Ten Limited | Mobile telescoping whip antenna with impedance matched feed sections |
| WO2008106822A1 (en) * | 2007-03-06 | 2008-09-12 | Zongshan Zhou | Method for resistance combining double sampling loop negative feedback and amplifier thereof |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
| CN104007370A (en) * | 2014-05-13 | 2014-08-27 | 深圳供电局有限公司 | Sensor and method used for monitoring partial discharge of cable |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN104090219A (en) * | 2014-07-18 | 2014-10-08 | 国家电网公司 | Partial discharge high-frequency monitor of high-voltage cable terminals |
| CN105527549A (en) * | 2015-12-04 | 2016-04-27 | 重庆臻远电气有限公司 | Partial discharge data collection circuit and detection system |
| CN205384348U (en) * | 2016-02-01 | 2016-07-13 | 广州智丰电气科技有限公司 | Portable intelligent four -channel partial discharge detection appearance signal frequency changes leading module |
| CN105548846A (en) * | 2016-02-01 | 2016-05-04 | 广州智丰电气科技有限公司 | Signal frequency conversion preposition module of portable intelligent four-channel partial discharge detector |
| CN110176932A (en) * | 2018-02-21 | 2019-08-27 | 亚德诺半导体无限责任公司 | Time interleaving filtering in analog-digital converter |
| CN211180052U (en) * | 2019-08-30 | 2020-08-04 | 咸亨国际（杭州）电气科技研究院有限公司 | Power cable partial discharge monitoring device using high-frequency current transformer |
| CN111077421A (en) * | 2019-12-30 | 2020-04-28 | 云南恒协科技有限公司 | Intelligent operation and detection system for cable line |
| JP2021113726A (en) * | 2020-01-17 | 2021-08-05 | Ｊｆｅスチール株式会社 | Diagnosis method and device of rotary bearing |
| WO2021198146A1 (en) * | 2020-03-31 | 2021-10-07 | Baur Gmbh | Electrical circuit |
| CN111830375A (en) * | 2020-07-01 | 2020-10-27 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Cable online monitoring device and method capable of positioning insulation defects |
| CN113064035A (en) * | 2021-04-06 | 2021-07-02 | 哈尔滨理工大学 | High-frequency partial discharge signal detection system |
| CN113009271A (en) * | 2021-04-22 | 2021-06-22 | 威胜集团有限公司 | Fault arc detection and positioning method, device and computer readable storage medium |
| CN113156196A (en) * | 2021-04-27 | 2021-07-23 | 广西电网有限责任公司桂林供电局 | Electronic transformer-based high-frequency sampling intelligent sensing terminal and implementation method |
Non-Patent Citations (9)
| Title |
|---|
| Analysis of acoustic emissions caused by the partial discharge in the insulation oil;T. Sakoda等;Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids;第1卷(第1期);20-24 * |
| Fundamental principles and application of diagnosis for GIS using partial discharge measurements;Masayuki Hikita;Proceedings of the 2011 International Conference on Electrical Engineering and Informatics;第1卷(第2期);1-9 * |
| 一种发电机故障放电信号特征实时在线自动识别方法及其应用;孙文星等;电网技术;第39卷(第2期);543-549 * |
| 一种基于屏蔽滤波的行波信号消噪方法;王兴国;黄少锋;;电力自动化设备(第06期);39-42 * |
| 利用行波测距技术实现局部放电定位的可行性分析;薛永端等;电气应用;第32卷(第5期);44-49 * |
| 变压器局部放电超高频检测中的混频技术研究;王国利等;中国电机工程学报;第24卷(第10期);115-120 * |
| 基于谱减法与小波分析的电缆局部放电信号降噪方法;苑文续等;现代电子技术;第44卷(第19期);71-75 * |
| 多传感技术融合的电缆局部放电检测系统的研发;李方利等;机电信息;第1卷(第18期);28-31 * |
| 电缆局部放电检测技术在舟山电网中的应用;张宪标等;电工技术;第1卷(第4期);46-69 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114280432A (en) | 2022-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103278751B (en) | Partial discharge comprehensive itinerant detector for high voltage electric power equipment | |
| CN101788614B (en) | High and low voltage integrated phase-sequence phase meter and detection method thereof | |
| CN111830375B (en) | Cable online monitoring device and method capable of positioning insulation defects | |
| CN111983376B (en) | Intra-regional and extra-regional fault protection method based on cosine similarity | |
| CN106771922A (en) | A kind of high-tension electricity system of detecting partial discharge in equipment and Recognition of Partial Discharge | |
| CN102981110A (en) | Data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of transformer | |
| CN104569764A (en) | Live detection system for creeping discharge of composite apparatus and method thereof | |
| CN103033685A (en) | Broadband harmonic collection and measurement system based on multi-band double-way filtering and broadband harmonic collection and measurement method based on the same | |
| CN111505467B (en) | Positioning system and method for abnormal discharge signals in partial discharge test of transformer | |
| CN114280432B (en) | Cable partial discharge monitoring equipment and method | |
| CN107091957A (en) | A kind of thunder measuring and orientation system and its localization method | |
| CN203037802U (en) | Data measuring storage system achieving transformer high-frequency and ultrahigh-frequency partial discharge monitoring | |
| CN104897974A (en) | Capacitive equipment dielectric loss measuring method and system | |
| CN102200550B (en) | Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately | |
| CN201583601U (en) | High-low voltage comprehensive phase sequence and phase position instrument | |
| CN203606470U (en) | Asynchronous time live-line measuring device for circuit breaker | |
| CN201903619U (en) | Positioning and detection device for partial discharge radio-frequency signal | |
| CN203950012U (en) | Switch cubicle partial simulation discharging detection device | |
| CN203465376U (en) | Electric power-used adaptive frequency-selection impedance partial discharge detector | |
| JP2004347424A (en) | Hot-line insulation deterioration diagnostic method and its device | |
| CN103472376B (en) | Partial discharge of transformer superfrequency positioning analysis device and method for positioning analyzing thereof | |
| CN205246818U (en) | Device is taked care of with three frequency centers to separation of many partial discharge source | |
| CN113419152B (en) | Acoustic-electric composite based fault insulator online detection device and detection method | |
| CN202502199U (en) | Cable ultrahigh frequency partial discharge detection apparatus | |
| CN211180052U (en) | Power cable partial discharge monitoring device using high-frequency current transformer |
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 |