CN114113863A - Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable - Google Patents
Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable Download PDFInfo
- Publication number
- CN114113863A CN114113863A CN202111466376.8A CN202111466376A CN114113863A CN 114113863 A CN114113863 A CN 114113863A CN 202111466376 A CN202111466376 A CN 202111466376A CN 114113863 A CN114113863 A CN 114113863A
- Authority
- CN
- China
- Prior art keywords
- voltage
- harmonic
- induction
- cable
- harmonic voltage
- 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.)
- Granted
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a harmonic voltage on-line measuring device and method of a high-voltage cable elbow terminal, which are characterized in that a plug of the cable elbow terminal is directly transformed, the original structure is basically not changed, a high-voltage conductor, a plug insulating layer and a voltage sensing device are used, the high-voltage conductor applies power frequency voltage and generates induced voltage on the voltage sensing device, the harmonic voltage of the cable elbow terminal is obtained according to the induced voltage, and the real-time on-line measurement of the harmonic component voltage of the cable elbow terminal is realized.
Description
Technical Field
The invention relates to the field of measurement of harmonic voltage of an elbow-shaped terminal of a cable, in particular to an online measurement device and method for harmonic voltage of an elbow-shaped terminal of a high-voltage cable.
Background
With the access of distributed renewable energy sources and the development of high-voltage direct current (HVDC) in an electric power system, harmonic voltage components are receiving more and more attention. In practical power system applications, commonly used measurement equipment are inductive and capacitive voltage transformers. In a power system with a rated voltage of 220kV or more, a Capacitive voltage divider (CVT) is generally used to measure the voltage of a high-voltage conductor. Taking a 220kV stepless transmission as an example, in order to better measure the power frequency, firstly, the high voltage is converted into 10kV at a low capacitance bridge, and then the 10kV is input into a winding type voltage transformer with a compensator and a resonant circuit, which is specially designed for power frequency voltage measurement but cannot accurately measure harmonic voltage, and the voltage transformer has a large scale, a complex structure and a high cost, so that the distributed voltage transformer cannot be deployed on a large scale to obtain voltage information of each node in the power system. Much research is based on existing continuously variable transmissions. In an actual high-voltage power system, the harmonic voltage component is much smaller than the fundamental voltage component, and the high-harmonic voltage component is further reduced as the harmonic number increases. Therefore, the harmonic voltage is not easy to measure, and no practical method for realizing on-line monitoring of the harmonic voltage component exists all over the world at present.
Disclosure of Invention
The invention aims to provide an online harmonic voltage measuring device and method for an elbow terminal of a high-voltage cable, which are used for online measurement of harmonic component voltage of the elbow terminal of the cable.
In order to achieve the purpose, the invention provides the following scheme:
a harmonic voltage sensing apparatus for an elbow termination of a high voltage cable, the harmonic voltage sensing apparatus comprising: the high-voltage conductor, the plug insulating layer and the voltage sensing device;
the high-voltage conductor is arranged at one end of the plug insulating layer, and the voltage sensing device is arranged at the other end of the plug insulating layer; the high-voltage conductor is used for applying power frequency voltage and generating induced voltage on the voltage sensing device; the induced voltage includes a plurality of harmonic voltages.
Optionally, the voltage sensing device includes an induction sheet, a sensor insulating layer, a link fitting, a measuring resistor, and a BNC connector;
the sensor insulating layer is arranged between the induction sheet and the connecting hardware fitting; the BNC connector is fixed in the central through hole of the link fitting;
one end of the measuring resistor is connected with the induction sheet, and the other end of the measuring resistor is connected with the connecting hardware fitting;
the shell of the BNC connector is connected with a connecting hardware fitting, and the connecting hardware fitting is grounded; the BNC connector is electrically connected with the conductor of the sensing piece and is used for transmitting the sensing voltage on the sensing piece.
Optionally, the voltage sensing device further includes: a metal conductor;
one end of the metal conductor is connected with the induction sheet, and the other end of the metal conductor penetrates through the sensor insulating layer to be connected with the conductor of the BNC connector.
Optionally, the sensor insulating layer is made of an epoxy resin material.
Optionally, the resistance range of the measuring resistor is 10k Ω -2M Ω.
An on-line harmonic voltage measuring device for an elbow termination of a high voltage cable, the on-line harmonic voltage measuring device comprising: the harmonic voltage induction device is arranged on the upper computer;
the harmonic voltage induction device is arranged inside a plug of the cable elbow-shaped terminal;
the harmonic voltage induction device is connected with the upper computer, and the upper computer is used for obtaining the harmonic voltage of the cable elbow terminal according to the induction voltage output by the harmonic voltage induction device.
Optionally, the harmonic voltage online measurement device further includes: a voltage detector and a voltage display;
the input end of the voltage meter is connected with the harmonic voltage induction device through a coaxial cable, and the output end of the voltage meter is connected with the voltage display; the voltage detector is used for measuring the induction voltage output by the harmonic voltage induction device; the voltage display is used for displaying the induction voltage.
A harmonic voltage online measurement method based on the high-voltage harmonic voltage online measurement device comprises the following steps:
acquiring an induction voltage;
and carrying out Fourier transform on the induction voltage, and extracting harmonic voltage.
Optionally, the online harmonic voltage measuring method further includes:
acquiring a plurality of single harmonic voltages in the harmonic voltages;
and restoring each single harmonic voltage to the primary side to obtain a plurality of single primary side harmonic voltages.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an online harmonic voltage measuring device and method of a high-voltage cable elbow terminal, which are characterized in that a plug of the cable elbow terminal is directly modified without basically changing the original structure, a high-voltage conductor, a plug insulating layer and a voltage sensing device are used, the high-voltage conductor applies power frequency voltage and generates induced voltage on the voltage sensing device, the harmonic voltage of the cable elbow terminal is obtained according to the induced voltage, and the real-time online measurement of the harmonic component voltage of the cable elbow terminal is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of the overall structure of a prior art cable elbow terminal;
FIG. 2 is a cross-sectional structural diagram of an online harmonic voltage measuring device provided by the present invention;
FIG. 3 is a cross-sectional structural view of a voltage sensing device provided in the present invention;
FIG. 4 is an equivalent circuit diagram of the harmonic voltage on-line measuring device provided by the present invention;
FIG. 5 is a comparison graph of harmonic voltage measured by a standard voltage transformer and harmonic voltage measured by an online harmonic voltage measurement provided by an embodiment of the present invention;
fig. 6 is a flowchart of an online harmonic voltage measuring method provided by the present invention.
Description of the symbols: the device comprises a stud bolt 1, a lug 2, a plug 3, a tail cover 4, a ground wire 5, a cold-shrink main body 6, a cable conductor 7, a high-voltage conductor 8, a plug insulating layer 9, a voltage sensing device 10, a cable 11, a voltage detector 12, a voltage display 13, an induction sheet 14, a sensor insulating layer 15, a connecting hardware fitting 16, a measuring resistor 17, a BNC connector outer conductor 18 and a BNC connector inner conductor 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an online harmonic voltage measuring device and method for an elbow terminal of a high-voltage cable, which are used for online measurement of harmonic component voltage of the elbow terminal of the cable.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The overall structure of the cable elbow terminal is a structure of a common elbow terminal, and as shown in fig. 1, the cable elbow terminal comprises a stud bolt 1, a lug 2, a plug 3, a tail cover 4, a ground wire 5, a cold-shrink main body 6 and a cable conductor 7. The lug 2 is pressed on the cable conductor 7; the cold-shrinkage main body 6 is sleeved on the cable conductor 7 and is in a coaxial structure with the cable conductor 7; the stud bolt 1 and the plug 3 are used for fixing the joint structure of the lug 2 and the cable conductor 7 on the switch cabinet support; the tail cover 4 is positioned at the elbow-shaped terminal end part of the cable 11 and covers the plug 3; the ground line 5 is connected to the system ground.
Referring to fig. 2, the present invention provides a harmonic voltage sensing apparatus of an elbow terminal of a high voltage cable, the harmonic voltage sensing apparatus comprising: a high voltage conductor 8, a plug insulation layer 9 and a voltage sensing device 10.
The high-voltage conductor 8 is arranged at one end of the plug insulating layer 9, and the voltage sensing device 10 is arranged at the other end of the plug insulating layer 9; the high-voltage conductor 8 is used for applying power frequency voltage and generating induced voltage on the voltage sensing device 10; the induced voltage includes a plurality of harmonic voltages.
Specifically, fig. 3 shows a detailed structure of the voltage sensing device 10, and the voltage sensing device 10 includes a sensing strip 14, a sensor insulating layer 15, a link fitting 16, a measuring resistor 17, and a BNC connector.
The sensor insulating layer 15 is arranged between the sensing piece 14 and the connecting fitting 16; the BNC connector is fixed in the central through hole of the link fitting 16; one end of the measuring resistor 17 is connected with the induction sheet 14, and the other end of the measuring resistor 17 is connected with the connecting hardware fitting 16; the shell of the BNC connector is connected with the link fitting 16, and the link fitting 16 is grounded and has the same potential; the conductors of the BNC connector are electrically connected to the sensor strip 14, and the BNC connector is used for transmitting the induced voltage on the sensor strip 14.
The BNC connector comprises a center conductor, a BNC connector outer conductor 18 and a BNC connector inner conductor 19. The central conductor of the BNC connector is connected with the induction sheet through a metal conductor.
The voltage sensing device 10 further includes: a metal conductor. One end of the metal conductor is connected with the sensing piece 14, and the other end of the metal conductor passes through the sensor insulating layer 15 to be connected with the conductor of the BNC connector. The metal conductor is used to transmit the voltage signal on the sensing piece 14.
The plug insulation layer 9 is the main body of the measuring device. The sensor insulating layer 15 is located between the sensing piece 14 and the connecting hardware fitting 16, and plays a role of insulation.
As a preferred embodiment, the sensor insulating layer 15 is made of epoxy resin. The resistance value range of the measuring resistor is 10k omega-2M omega.
Fig. 2 is a cross-sectional structural view of the harmonic voltage on-line measuring device provided by the invention. The invention also provides an online harmonic voltage measuring device of the elbow-shaped terminal of the high-voltage cable, which comprises the following components: an upper computer and the harmonic voltage sensing device of any one of claims 1 to 5.
The harmonic voltage induction device is arranged in a plug 3 of the cable elbow-shaped terminal; the harmonic voltage induction device is connected with the upper computer, and the upper computer is used for obtaining the harmonic voltage of the cable elbow terminal according to the induction voltage output by the harmonic voltage induction device.
The harmonic voltage on-line measuring device further comprises: a voltage detector 12 and a voltage display 13.
The input end of the voltage detector 12 is connected with the harmonic voltage induction device through a coaxial cable (a cable 11 in fig. 2), and the output end of the voltage detector 12 is connected with the voltage display 13; the voltage detector 12 is used for measuring the induction voltage output by the harmonic voltage induction device; the voltage display 13 is used to display the induced voltage. The voltage meter 12 and the voltage display 13 together are equivalent to an oscilloscope.
The invention discloses a method and a device for measuring harmonic voltage of a cable elbow terminal, which are used for transforming the structure of a plug 3 of the cable elbow terminal, wherein a sensor is arranged in the plug 3, and harmonic voltage signals in the elbow terminal and on a cable line can be detected by a simple voltage measuring device and displayed by a voltage display 13. The method not only ensures the accuracy and the safety of measurement, but also does not influence the running state of the equipment. And the measuring device has small volume and convenient installation, and can be installed and deployed in a large scale in an actual power system.
The equivalent circuit diagram of the harmonic voltage on-line measuring device suitable for the elbow-shaped terminal of the cable provided by the invention is shown in figure 4,
for the power frequency voltage applied to the cable high voltage conductor 8,
is the phasor of the voltage induced on the plate on the sensing plate 14. C1The space capacitance, C, of the high-voltage conductor 8 of the cable to the induction sheet 14gIs the gap capacitance, R, between the sensing piece 14 and groundmIs a measuring resistor 17 connected in parallel between the sensing piece 14 and the high voltage conductor 8. During measurement, the inductive sheet 14 and the high voltage conductor are connected through the BNC connectorThe voltage signal extraction between the bodies 8 inevitably brings the input impedance of the subsequent signal transmission and display circuit in parallel across the measuring resistor 17, thus introducing the measuring system. CcCapacitance, R, of 50 omega coaxial cable0Is the input resistance of the voltage display 13.
As can be seen from fig. 4, the voltage measured by the voltage meter is the voltage across the measuring resistor, the voltage display displays the voltage across the resistor measured by the voltage meter, and the harmonic voltage at the elbow terminal of the cable can be obtained by measuring the voltage across the resistor.
Wherein the content of the first and second substances,
Reqis the equivalent resistance, C, of the dashed box in FIG. 4eqThe equivalent capacitance, τ, is shown in FIG. 4 as a dashed boxeqIs the time constant of the circuit.
When the applied voltage amplitude of each harmonic is the same, set RnFor different ratios of second harmonic voltage components to fundamental voltage, i.e.
In the formula of omega1The fundamental angular frequency. For a measurement system, the capacitance of the coaxial cable can be ignored, and τeqIs 2.5 multiplied by 10-4s, then equation (3) can be expressed as: rn＝n。
That is, in the secondary voltage, the harmonic voltage is increased by n times with respect to the fundamental voltage.
Referring to fig. 6, the present invention further provides an online harmonic voltage measuring method based on the online high-voltage harmonic voltage measuring apparatus, where the online harmonic voltage measuring method includes:
And 102, carrying out Fourier transform on the induction voltage, and extracting harmonic voltage.
After step 102, acquiring a plurality of single harmonic voltages in the harmonic voltages; and restoring each single harmonic voltage to the primary side to obtain a plurality of single primary side harmonic voltages.
In order to verify the effectiveness and accuracy of the harmonic voltage online measurement device and method of the present invention, the following specific embodiments are provided.
The standard voltage transformer can be directly connected to the high-voltage conductor 8 of the cable for measuring the harmonic wave. Based on the fundamental voltage component, the voltage component measured by the measuring device is compared with the voltage component measured by the standard voltage transformer, the linearity of the measuring system is considered, in order to analyze the condition of each harmonic interference, the fast fourier transform is carried out on the measuring results of several different measuring methods of different measuring devices, the size of each frequency component in the waveform is extracted, the induced harmonic voltage is restored to the primary side according to equivalent circuits under different frequencies, and is compared with the harmonic measured by the standard voltage transformer, and partial results are shown in fig. 5. The abscissa in fig. 5 is the magnitude of the power frequency voltage applied to the cable high-voltage conductor 8, and the ordinate is the magnitude of the harmonic voltage of the standard voltage transformer and the induced voltage recovery, respectively.
For harmonic interference components of 3, 5 and 7 orders existing in the cable high-voltage conductor 8, the measuring device measures that the waveform contains the frequency components, and can reflect the size and the variation trend of the harmonic components in the cable high-voltage conductor 8 to a certain extent. The experiment verifies the effectiveness and accuracy of the measuring device and the method for online monitoring of the harmonic voltage component. Experiments and analysis show that the harmonic voltage measuring method is suitable for a high-voltage power system.
The invention produces the following advantages:
the method and the device for measuring the harmonic voltage of the cable elbow terminal can measure the harmonic voltage of the cable elbow terminal in real time, and no practical method for measuring the harmonic component voltage on line exists at present.
Compared with the prior art, the method and the device for measuring the harmonic voltage of the cable elbow-shaped terminal have the advantages that the harmonic voltage component can be amplified, and the method and the device are more suitable for measuring the harmonic voltage.
Compared with the prior art, the method and the device for measuring the harmonic voltage of the cable elbow terminal have the advantages that the method and the device can be directly modified on a plug of the cable elbow terminal, and the original structure of the cable elbow terminal is basically not changed.
The method and the device for measuring the harmonic voltage of the elbow-shaped terminal of the cable are convenient to install, wide in application range and free from geographical environment constraint.
The method and the device for measuring the harmonic voltage of the cable elbow terminal can timely find the cable elbow terminal in a bad operation state, and operators can process the cable elbow terminal without waiting for faults, so that the safe and stable operation of the whole cable system is guaranteed.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A harmonic voltage sensing apparatus for an elbow termination of a high voltage cable, the harmonic voltage sensing apparatus comprising: the high-voltage conductor, the plug insulating layer and the voltage sensing device;
the high-voltage conductor is arranged at one end of the plug insulating layer, and the voltage sensing device is arranged at the other end of the plug insulating layer; the high-voltage conductor is used for applying power frequency voltage and generating induced voltage on the voltage sensing device; the induced voltage includes a plurality of harmonic voltages.
2. The harmonic voltage sensing device of the elbow terminal of the high voltage cable of claim 1, wherein the voltage sensing device comprises a sensing strip, a sensor insulation layer, a link fitting, a measuring resistor and a BNC connector;
the sensor insulating layer is arranged between the induction sheet and the connecting hardware fitting; the BNC connector is fixed in the central through hole of the link fitting;
one end of the measuring resistor is connected with the induction sheet, and the other end of the measuring resistor is connected with the connecting hardware fitting;
the shell of the BNC connector is connected with a connecting hardware fitting, and the connecting hardware fitting is grounded; the BNC connector is electrically connected with the conductor of the sensing piece and is used for transmitting the sensing voltage on the sensing piece.
3. The harmonic voltage sensing apparatus of claim 2 wherein the voltage sensing apparatus further comprises: a metal conductor;
one end of the metal conductor is connected with the induction sheet, and the other end of the metal conductor penetrates through the sensor insulating layer to be connected with the conductor of the BNC connector.
4. The harmonic voltage sensing device of claim 2 wherein the sensor insulation layer is an epoxy material.
5. The harmonic voltage sensing device of claim 2 wherein the measuring resistor has a resistance value in the range of 10k Ω -2M Ω.
6. An on-line harmonic voltage measuring device for an elbow terminal of a high-voltage cable, the on-line harmonic voltage measuring device comprising: an upper computer and the harmonic voltage induction device of any one of claims 1 to 5;
the harmonic voltage induction device is arranged inside a plug of the cable elbow-shaped terminal;
the harmonic voltage induction device is connected with the upper computer, and the upper computer is used for obtaining the harmonic voltage of the cable elbow terminal according to the induction voltage output by the harmonic voltage induction device.
7. The on-line harmonic voltage measuring device of an elbow termination of a high-voltage cable according to claim 6, further comprising: a voltage detector and a voltage display;
the input end of the voltage meter is connected with the harmonic voltage induction device through a coaxial cable, and the output end of the voltage meter is connected with the voltage display; the voltage detector is used for measuring the induction voltage output by the harmonic voltage induction device; the voltage display is used for displaying the induction voltage.
8. An online harmonic voltage measuring method based on the online high-voltage harmonic voltage measuring device of any one of claims 6 to 7, wherein the online harmonic voltage measuring method comprises the following steps:
acquiring an induction voltage;
and carrying out Fourier transform on the induction voltage, and extracting harmonic voltage.
9. The harmonic voltage online measurement method according to claim 8, further comprising:
acquiring a plurality of single harmonic voltages in the harmonic voltages;
and restoring each single harmonic voltage to the primary side to obtain a plurality of single primary side harmonic voltages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111466376.8A CN114113863B (en) | 2021-12-03 | 2021-12-03 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111466376.8A CN114113863B (en) | 2021-12-03 | 2021-12-03 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114113863A true CN114113863A (en) | 2022-03-01 |
| CN114113863B CN114113863B (en) | 2022-10-28 |
Family
ID=80366070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111466376.8A Active CN114113863B (en) | 2021-12-03 | 2021-12-03 | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114113863B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001215254A (en) * | 2000-02-01 | 2001-08-10 | Mitsubishi Cable Ind Ltd | Method for diagnosing deterioration in insulation of power cable |
| CN102081130A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团宁夏有限公司 | Electrified cable detection method, device and system |
| CN106324353A (en) * | 2016-08-17 | 2017-01-11 | 国家电网公司 | Inductive filtering converter transformer harmonic wave impedance measurement method and device |
| CN107843805A (en) * | 2017-10-30 | 2018-03-27 | 华北电力大学（保定） | Brushless exciter rotating diode open fault inline diagnosis method |
| CN110208602A (en) * | 2019-06-06 | 2019-09-06 | 福州大学 | One kind being conducive to transformer ultra harmonics transmission characteristic counting circuit and its calculation method |
| CN210780772U (en) * | 2019-12-29 | 2020-06-16 | 浙江维思无线网络技术有限公司 | Power grid electricity testing device |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN114113949A (en) * | 2021-12-03 | 2022-03-01 | 广东电网有限责任公司广州供电局 | Device for measuring partial discharge |
| CN114200262A (en) * | 2021-12-03 | 2022-03-18 | 华北电力大学 | High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device |
-
2021
- 2021-12-03 CN CN202111466376.8A patent/CN114113863B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001215254A (en) * | 2000-02-01 | 2001-08-10 | Mitsubishi Cable Ind Ltd | Method for diagnosing deterioration in insulation of power cable |
| CN102081130A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团宁夏有限公司 | Electrified cable detection method, device and system |
| CN106324353A (en) * | 2016-08-17 | 2017-01-11 | 国家电网公司 | Inductive filtering converter transformer harmonic wave impedance measurement method and device |
| CN107843805A (en) * | 2017-10-30 | 2018-03-27 | 华北电力大学（保定） | Brushless exciter rotating diode open fault inline diagnosis method |
| CN110208602A (en) * | 2019-06-06 | 2019-09-06 | 福州大学 | One kind being conducive to transformer ultra harmonics transmission characteristic counting circuit and its calculation method |
| CN210780772U (en) * | 2019-12-29 | 2020-06-16 | 浙江维思无线网络技术有限公司 | Power grid electricity testing device |
| CN112034236A (en) * | 2020-09-07 | 2020-12-04 | 华北电力大学 | Online monitoring device and method for transient voltage of cable elbow terminal |
| CN114113949A (en) * | 2021-12-03 | 2022-03-01 | 广东电网有限责任公司广州供电局 | Device for measuring partial discharge |
| CN114200262A (en) * | 2021-12-03 | 2022-03-18 | 华北电力大学 | High-voltage cable elbow terminal partial discharge and transient steady state voltage on-line measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114113863B (en) | 2022-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Martinez-Velasco | Power system transients: parameter determination | |
| CN105277857A (en) | Method for on-line monitoring of damping defect of transformer bushing | |
| Li et al. | On-line cable condition monitoring using natural power disturbances | |
| Rajamani et al. | Interturn short diagnosis in small transformers through impulse injection: on‐line on‐load self‐impedance transfer function approach | |
| CN110850178A (en) | Insulation sleeve on-line frequency domain dielectric spectrum detection method | |
| Zhao et al. | Testing and modelling of voltage transformer for high order harmonic measurement | |
| US2948849A (en) | Method and apparatus for measuring apparent corona charge | |
| CN106896302A (en) | GIS device low-voltage conductor surface field strength meter and method | |
| Khayam et al. | Design and application of loop antenna for partial discharge induced electromagnetic wave detection | |
| Sharath et al. | Prediction of impulse voltage-time characteristics of air and oil insulation for different wavefronts | |
| Liu et al. | A low‐cost and high‐performance self‐trigger method for high‐voltage transient measurement | |
| CN114113863B (en) | Harmonic voltage on-line measuring device and method for elbow-shaped terminal of high-voltage cable | |
| CN110542777B (en) | Three-phase integrated GIS independent bus voltage measuring device | |
| Vakilian et al. | Semiconducting layer as an attractive PD detection sensor of XLPE cables | |
| Shan et al. | Effect of segmented thermal aging on defect location accuracy in XLPE distribution cables | |
| Zhang et al. | Conical voltage sensor for measuring very fast transient overvoltage up to 3 MV in ultra‐high‐voltage class gas‐insulated switchgear | |
| CN113281614B (en) | Power cable broadband impedance spectrum test method | |
| Xia et al. | Simulation and partial discharge detection for typical defects of 10 kV cable the joint | |
| CN211627687U (en) | Online frequency domain dielectric spectrum detection system for high-voltage insulating sleeve | |
| Shi et al. | Application of augmented spread spectrum time domain reflectometry for detection and localization of soft faults on a coaxial cable | |
| Srinangyam et al. | Online PD Measurement by Detecting the Pulsed Compensating Current in High Voltage Equipment | |
| Rahim et al. | Partial Discharge Detection using Developed Low-cost High Frequency Current Transformer | |
| Aguiar do Nascimento et al. | Evaluation of partial discharge signatures using inductive coupling at on-site measuring for instrument transformers | |
| Liu et al. | Low Cut-Off Frequency Extension and Amplitude Decoupling Analysis in Non-Contact Transient Measurement | |
| Rathnayaka et al. | Inductively coupled on‐line impedance measurement for condition monitoring of electrical equipment |
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 |