CN113092965A - Converter valve equipment defect partial discharge detection device based on microphone array - Google Patents
Converter valve equipment defect partial discharge detection device based on microphone array Download PDFInfo
- Publication number
- CN113092965A CN113092965A CN202110383660.2A CN202110383660A CN113092965A CN 113092965 A CN113092965 A CN 113092965A CN 202110383660 A CN202110383660 A CN 202110383660A CN 113092965 A CN113092965 A CN 113092965A
- Authority
- CN
- China
- Prior art keywords
- module
- data acquisition
- microphone array
- partial discharge
- local
- 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.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a converter valve equipment defect partial discharge detection device based on a microphone array, which comprises: the system comprises a microphone array module, a data acquisition far-end module, an optical fiber transmission module, a data acquisition local module and a computer data processing part, wherein the microphone array module, the data acquisition far-end module, the optical fiber transmission module, the data acquisition local module and the computer data processing part are connected in sequence. The converter valve equipment defect partial discharge detection device based on the microphone array provided by the invention adopts the microphone array to obtain converter valve equipment defect partial discharge information, and remotely transmits data to a terminal for real-time display by taking optical fibers as a transmission medium, and has the characteristics of high detection precision, strong reliability and strong practicability.
Description
Technical Field
The invention relates to the technical field of high-power electronics, in particular to a converter valve equipment defect partial discharge detection device based on a microphone array.
Background
The converter valve is used as core equipment for electric energy conversion in an extra-high voltage direct current transmission project, safe and reliable operation of the converter valve must be ensured, and with the increase of the operation time of the converter valve, some equipment inside the converter valve is influenced by external environment and operation conditions, so that the problems of typical equipment defects such as insulation material aging, wiring terminal loosening and the like are difficult to avoid, the converter valve is damaged, and a power grid is subjected to operation failure, so that huge economic loss and severe social influence are caused.
The existing high-voltage equipment defect partial discharge detection device mainly adopts the techniques of a pulse current method, an ultraviolet imaging method and an acoustic array positioning method. The pulse current method has the advantages of being convenient and direct in measurement and high in off-line measurement sensitivity, but the converter valve serving as important equipment for connecting the alternating current system and the direct current system can be in a working operation state for a long time, and an off-line detection means is not applicable generally; when defects exist on the surface of equipment in the converter valve and the local field intensity value reaches the value capable of forming discharge, energy is transferred and released in the discharge process, the generated ultraviolet light signal is a physical signal characteristic in the process, the ultraviolet imaging method is to judge whether the surface of the equipment in the converter valve has the defects by utilizing an ultraviolet imager to shoot the ultraviolet light signal, but the ultraviolet imager adopting the ultraviolet imaging method is expensive, and the judgment standards of the fault grades of the ultraviolet imagers of different models are not unified; for the existing acoustic array positioning method, a scholars uses an acoustic array detection device with a shielding wire as a transmission medium to position partial discharge of electrical equipment inside a transformer and a switch cabinet, and strong electromagnetic interference exists in the surrounding space environment of an extra-high voltage direct current converter valve, so that data collected by the acoustic array detection device with the shielding wire as the transmission medium may have interference, and the data do not have high reliability any more, which can cause great influence or even completely inaccuracy on the positioning precision of the defect position of the equipment in the converter valve.
Disclosure of Invention
The invention aims to provide a converter valve equipment defect partial discharge detection device based on a microphone array.
In order to achieve the purpose, the invention provides the following scheme:
a converter valve equipment defect partial discharge detection device based on a microphone array comprises: microphone array module, data acquisition far-end module, optic fibre transmission module, local module of data acquisition and computer data processing part, microphone array module, data acquisition far-end module, optic fibre transmission module, local module of data acquisition and computer data processing part are connected gradually, wherein:
the microphone array module is arranged in a converter valve hall and used for collecting local discharge sound signals of defective equipment in a converter valve;
the data acquisition remote end module is provided with an input port and an output port, the input port is an optical synchronous input port, the output port is an optical acquisition data output port, and the data acquisition remote end module synchronously receives the local discharge sound signal through the input port and outputs the local discharge sound signal through the output port;
the optical fiber transmission module comprises two optical fibers, wherein one optical fiber is used for transmitting the protocol command transmitted by the data acquisition local module to the data acquisition remote end module, and the other optical fiber is used for transmitting the local discharge sound signal to the data acquisition local module;
the data acquisition local module is used for communicating protocol commands of the computer processing part and receiving the partial discharge sound signals transmitted by the optical fiber transmission module;
the computer data processing part is used for issuing protocol commands and displaying, judging and storing the collected partial discharge sound signals.
Optionally, the microphone array module includes 16 microphone sensors, and the 16 microphone sensors are arranged in a 4 × 4 square structure.
Optionally, the frequency response range of the microphone array module is 20Hz to 20KHz, the connection mode is a three-wire system, the power source VCC interface is connected with a 5V dc power source, the signal AO interface is a microphone signal output interface, and the connection GND port is directly grounded.
Optionally, the maximum sampling rate of the data acquisition remote module is 200K, and a power supply port of the data acquisition remote module is connected to a 12V dc power supply.
Optionally, the expansion path of the data acquisition local module is a 36 path, and a power VCC interface of the data acquisition local module is connected to 220V power frequency voltage.
Optionally, the computer data processing portion adopts a LABVIEW program, and is configured to display the partial discharge signal acquired by the microphone array module, determine the generated partial discharge signal, and store the generated partial discharge signal.
Optionally, the computer data processing part is connected to the data acquisition local module through a UDP protocol.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: according to the converter valve equipment defect partial discharge detection device based on the microphone array, a microphone array module, a data acquisition far-end module, an optical fiber transmission module, a data acquisition local module and a computer data processing part are integrated, converter valve equipment defect partial discharge information acquired by the microphone array is adopted, and data is remotely transmitted to a terminal for real-time display by taking an optical fiber as a transmission medium, so that the device can stably work in a converter valve strong electromagnetic interference environment, the problem that transmission data is inaccurate due to strong electromagnetic interference of a traditional cable is solved, and the detection precision is high and the reliability is strong; the method can adapt to complex field environment, can realize the live detection of the extra-high voltage direct current converter valve, and has strong practicability; the accuracy of subsequently utilizing a positioning algorithm to position the defect position of the converter valve equipment is improved, great convenience is provided for field operation and maintenance personnel, and the overhauling efficiency of the converter valve equipment can be greatly improved.
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 block diagram of a converter valve device defect partial discharge detection apparatus based on a microphone array according to an embodiment of the present invention;
fig. 2 is a schematic structural arrangement diagram of a microphone sensor according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a converter valve device defect partial discharge detection apparatus based on a microphone array according to an embodiment of the present invention;
description of reference numerals: 1. a microphone array module; 2. a data acquisition remote module; 3. an optical fiber transmission module; 4. a data acquisition local module; 5. and a computer data processing part.
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 a converter valve equipment defect partial discharge detection device based on a microphone array.
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.
As shown in fig. 1, a converter valve device defect partial discharge detection apparatus based on a microphone array according to an embodiment of the present invention includes: the system comprises a microphone array module 1, a data acquisition far-end module 2, an optical fiber transmission module 3, a data acquisition local module 4 and a computer data processing part 5, wherein the microphone array module 1, the data acquisition far-end module 2, the optical fiber transmission module 3, the data acquisition local module 4 and the computer data processing part 5 are connected in sequence.
The microphone array module 1 is arranged in a converter valve hall and used for collecting local discharge sound signals of defective equipment in a converter valve; the microphone array module 1 includes 16 microphone sensors, and the 16 microphone sensors are arranged in a 4 × 4 square structure, as shown in fig. 2; the frequency response range of the microphone array module 1 is 20Hz-20KHz, the wiring is a three-wire system, a power VCC interface is connected with a 5V direct-current power supply, a signal AO interface is a signal output interface, a wiring GND port is directly grounded, the microphone array module 1 can convert sound signals of the surrounding environment into electric signals for detecting the sound of the surrounding environment, 16 microphone sensors are arranged into a 4 x 4 square structure, and the positioning of a discharge sound source is carried out by utilizing the different time when local discharge sound signals reach different microphone sensors; when a power indicator lamp of the microphone array module 1 is on, the microphone sensor works normally, the amplitude of an analog signal output by a signal AO port of the microphone array module is adjusted by adjusting the position of a potentiometer on the microphone sensor, and the amplitude of the analog signal output by the signal AO port is larger by clockwise adjusting the potentiometer under the same decibel; and the smaller the amplitude of the analog signal output by the signal AO interface is, the smaller the potentiometer is adjusted anticlockwise.
The data acquisition remote end module 2 is provided with an input port and an output port, the input port is an optical synchronous input port, the output port is an optical acquisition data output port, and the data acquisition remote end module 2 synchronously receives the local discharge sound signal through the input port and outputs the local discharge sound signal through the output port; the maximum sampling rate of the data acquisition remote module 2 is 200K, and the voltage of a power supply port required by direct current is 12V; the data acquisition remote module 2 controls a front-end high-speed high-precision Analog-to-Digital Converter (ADC) to synchronously acquire the local discharge sound signals under strict clock synchronization through externally input high-speed acquisition pulses, so that the synchronization of data transmission is ensured. The optical fiber transmission module 3 comprises two optical fibers, wherein one optical fiber is used for transmitting a protocol command transmitted by the data acquisition local module 4 to the data acquisition remote end module 2, the optical fibers are triggered by light pulses to ensure synchronous acquisition of 16 remote end high-speed acquisition modules and ensure synchronism of voltage signals, the other optical fiber is used for transmitting local discharge sound data to the data acquisition local module 4, and the optical fiber transmission module 3 performs analog-to-digital conversion and photoelectric conversion on the data acquired by the data acquisition remote end module 2 and transmits the data to the data acquisition local module 4 through the optical fibers; the optical fiber transmission data has the advantages of strong anti-electromagnetic interference capability, higher equipment operating voltage in the extra-high voltage direct current converter valve and more complex electromagnetic signals in space, can better ensure the accuracy of data transmission by adopting an optical fiber data transmission mode, and can ensure that the distance between a detector and high-voltage equipment is safer by adopting optical fiber transmission.
The data acquisition local module 4 is used for transmitting a protocol command of the computer data processing part 5 and receiving the local discharge sound signal transmitted by the optical fiber transmission module 3; specifically, the data acquisition local module 4 includes two parts, one part is: a downlink command, namely a command that the computer data processing part 5 sends a local discharge sound signal to start collecting or a local discharge sound signal to close collecting to the data collecting local module 4; the other part is that: uplink data, namely receiving the partial discharge sound signal data transmitted by the optical fiber transmission module 3, performing photoelectric conversion, and converting the optical signal into an electrical signal which can be recognized by the computer data processing part 5; the power interface of the local data acquisition module 4 is connected with 220V power frequency voltage, the indicator light of the local data acquisition module 4 is turned on to indicate normal power supply operation, and the local data acquisition module 4 adopted in the embodiment can be expanded to 36-channel signal synchronous acquisition at most.
The computer data processing part 5 is used for issuing protocol commands and displaying, judging and storing the collected partial discharge sound signals; the computer data processing part 5 is connected with the data acquisition local module 4 through a User Datagram Protocol (UDP), a method for sending the encapsulated IP data packet without establishing connection is established through the UDP, the computer data processing part 5 adopts an LABVIEW program, programming of the LABVIEW is carried out on a computer to display the partial discharge sound signals acquired by the 16 microphone sensors, whether the partial discharge sound signals are generated and the size and time of the signals are visually seen, then whether the partial discharge signals are generated is judged, if the partial discharge sound signals are generated, storage is carried out, if the partial discharge sound signals are not generated, data storage is not carried out, and waste of storage space is avoided.
The working principle of the device is as follows: as shown in fig. 3, if there is a defective device in the converter valve and a local discharge sound signal is sent out, the microphone array module will collect the local discharge sound signal, the computer is operated, the computer data processing part sends a local discharge sound signal collection command, the computer transmits the command to the data collection local module through a UDP protocol, and then transmits the command to the data collection remote module through the optical fiber transmission module, the data collection remote module starts to receive the local discharge sound signal collected by the microphone array module, and the local discharge sound signal is transmitted to the computer data processing part through the optical fiber transmission module and the data collection local module in sequence; the partial discharge signal is an instantaneous signal, if the data is directly stored after being acquired, the data volume is huge, the partial discharge sound signal is displayed and judged through LABVIEW programming on a computer, whether the data is stored is determined, if the partial discharge signal exists, the data is not stored, the stored 16-channel partial discharge sound signal is used for calculating the position of a discharge sound source by using a positioning algorithm set in a program, and the position of a defect of equipment in the extra-high voltage direct current converter valve can be positioned.
According to the converter valve equipment defect partial discharge detection device based on the microphone array, a microphone array module, a data acquisition far-end module, an optical fiber transmission module, a data acquisition local module and a computer data processing part are integrated, converter valve equipment defect partial discharge information acquired by the microphone array is adopted, and data is remotely transmitted to a terminal for real-time display by taking an optical fiber as a transmission medium, so that the device can stably work in a converter valve strong electromagnetic interference environment, the problem that transmission data is inaccurate due to strong electromagnetic interference of a traditional cable is solved, and the detection precision is high and the reliability is strong; the method can adapt to complex field environment, can realize the live detection of the extra-high voltage direct current converter valve, and has strong practicability; the accuracy of subsequently utilizing a positioning algorithm to position the defect position of the converter valve equipment is improved, great convenience is provided for field operation and maintenance personnel, and the overhauling efficiency of the converter valve equipment can be greatly improved.
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 (7)
1. A converter valve equipment defect partial discharge detection device based on microphone array, characterized by includes: microphone array module, data acquisition far-end module, optic fibre transmission module, local module of data acquisition and computer data processing part, microphone array module, data acquisition far-end module, optic fibre transmission module, local module of data acquisition and computer data processing part are connected gradually, wherein:
the microphone array module is arranged in a converter valve hall and used for collecting local discharge sound signals of defective equipment in a converter valve;
the data acquisition remote end module is provided with an input port and an output port, the input port is an optical synchronous input port, the output port is an optical acquisition data output port, and the data acquisition remote end module synchronously receives the local discharge sound signal through the input port and outputs the local discharge sound signal through the output port;
the optical fiber transmission module comprises two optical fibers, wherein one optical fiber is used for transmitting the protocol command transmitted by the data acquisition local module to the data acquisition remote end module, and the other optical fiber is used for transmitting the local discharge sound signal to the data acquisition local module;
the data acquisition local module is used for communicating protocol commands of the computer processing part and receiving the partial discharge sound signals transmitted by the optical fiber transmission module;
the computer data processing part is used for issuing protocol commands and displaying, judging and storing the collected partial discharge sound signals.
2. The apparatus of claim 1, wherein the microphone array module comprises 16 microphone sensors, and the 16 microphone sensors are arranged in a 4 x 4 square structure.
3. The device for detecting the defect partial discharge of the converter valve equipment based on the microphone array as claimed in claim 1, wherein the frequency response range of the microphone array module is 20Hz-20KHz, the wiring mode is a three-wire system, a power supply VCC interface is connected with a 5V direct current power supply, a signal AO interface is a microphone signal output interface, and a wiring GND port is directly grounded.
4. The device for detecting the defect partial discharge of the converter valve equipment based on the microphone array as claimed in claim 1, wherein the maximum sampling rate of the data acquisition remote module is 200K, and a power supply port of the data acquisition remote module is connected with a 12V direct current power supply.
5. The device for detecting the defect partial discharge of the converter valve equipment based on the microphone array as claimed in claim 1, wherein the extension path of the data acquisition local module is a 36-path, and a power supply VCC interface of the data acquisition local module is connected with 220V power frequency voltage.
6. The apparatus as claimed in claim 1, wherein the computer data processing part employs a LABVIEW program for displaying the partial discharge signal collected by the microphone array module, determining the generated partial discharge signal, and storing the generated partial discharge signal.
7. The apparatus of claim 1, wherein the computer data processing part is connected with the local data acquisition module through a UDP protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383660.2A CN113092965A (en) | 2021-04-09 | 2021-04-09 | Converter valve equipment defect partial discharge detection device based on microphone array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383660.2A CN113092965A (en) | 2021-04-09 | 2021-04-09 | Converter valve equipment defect partial discharge detection device based on microphone array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113092965A true CN113092965A (en) | 2021-07-09 |
Family
ID=76675690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110383660.2A Pending CN113092965A (en) | 2021-04-09 | 2021-04-09 | Converter valve equipment defect partial discharge detection device based on microphone array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113092965A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589117A (en) * | 2021-08-16 | 2021-11-02 | 国网江苏省电力有限公司泰州供电分公司 | Power equipment defect detection system and detection method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2541023A1 (en) * | 2005-03-29 | 2006-09-29 | Areva T & D Sa | Method of detecting the position of a wave front in a signal received by a detector |
| CN102565640A (en) * | 2011-12-26 | 2012-07-11 | 中电普瑞科技有限公司 | Partial discharge on-line monitoring device for power electronic valve body |
| CN105334432A (en) * | 2014-08-07 | 2016-02-17 | 华北电力大学（保定） | GIS partial discharge supersonic wave detection system |
| CN109788382A (en) * | 2019-01-25 | 2019-05-21 | 深圳大学 | A kind of distribution microphone array pickup system and method |
| CN110940884A (en) * | 2019-12-18 | 2020-03-31 | 西安西电电力系统有限公司 | Converter valve short-circuit current automatic test method and device and control protection equipment |
| CN111665422A (en) * | 2020-06-08 | 2020-09-15 | 郑州精铖电力设备有限公司 | FPGA-based microphone array non-invasive type broadband sound wave real-time imaging detection system |
| CN111736050A (en) * | 2020-08-28 | 2020-10-02 | 杭州兆华电子有限公司 | Partial discharge fault monitoring and evaluating device and method |
-
2021
- 2021-04-09 CN CN202110383660.2A patent/CN113092965A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2541023A1 (en) * | 2005-03-29 | 2006-09-29 | Areva T & D Sa | Method of detecting the position of a wave front in a signal received by a detector |
| CN102565640A (en) * | 2011-12-26 | 2012-07-11 | 中电普瑞科技有限公司 | Partial discharge on-line monitoring device for power electronic valve body |
| CN105334432A (en) * | 2014-08-07 | 2016-02-17 | 华北电力大学（保定） | GIS partial discharge supersonic wave detection system |
| CN109788382A (en) * | 2019-01-25 | 2019-05-21 | 深圳大学 | A kind of distribution microphone array pickup system and method |
| CN110940884A (en) * | 2019-12-18 | 2020-03-31 | 西安西电电力系统有限公司 | Converter valve short-circuit current automatic test method and device and control protection equipment |
| CN111665422A (en) * | 2020-06-08 | 2020-09-15 | 郑州精铖电力设备有限公司 | FPGA-based microphone array non-invasive type broadband sound wave real-time imaging detection system |
| CN111736050A (en) * | 2020-08-28 | 2020-10-02 | 杭州兆华电子有限公司 | Partial discharge fault monitoring and evaluating device and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589117A (en) * | 2021-08-16 | 2021-11-02 | 国网江苏省电力有限公司泰州供电分公司 | Power equipment defect detection system and detection method |
| CN113589117B (en) * | 2021-08-16 | 2024-05-07 | 国网江苏省电力有限公司泰州供电分公司 | Power equipment defect detection system and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102385026A (en) | On-line positioning method and device for partial discharge of high-voltage cable line | |
| CN202383234U (en) | Online positioning apparatus for partial discharge of high-voltage cable line | |
| CN202075376U (en) | GIS (gas-insulated switchgear) partial discharge monitoring device | |
| CN109212393A (en) | A kind of detection device for insulator deterioration | |
| CN107884690A (en) | GIS switch partial discharge on-line monitoring systems and method based on low-light level sensor | |
| CN113092965A (en) | Converter valve equipment defect partial discharge detection device based on microphone array | |
| CN202256590U (en) | Insulation on-line monitoring device for transformer bushing | |
| CN212007767U (en) | Power transformer mechanical state detection system | |
| CN112051437B (en) | Transmission line thunderbolt detection device | |
| CN2890942Y (en) | Insulation part damage positioning detector for high voltage electric apparatus | |
| CN112684293A (en) | Power distribution system insulation fault diagnosis device | |
| CN204705693U (en) | Small-sized Aviation cable fault detect orientator | |
| CN209690449U (en) | Local discharge on-line monitoring device and system based on ubiquitous electric power Internet of Things | |
| CN110880233A (en) | Time-synchronized hybrid analog and digital sensor data acquisition system and method | |
| CN206038859U (en) | Engine failure alarm device based on li sa is like electric volume fusion technique | |
| CN115453283A (en) | Two-in-one partial discharge sensor detection device and method | |
| CN104655994B (en) | GIS partial discharge on-line monitoring systems | |
| CN103954686A (en) | Porcelain post insulator mechanical state online monitoring system and monitoring method | |
| CN212134820U (en) | Capacitance test analytical equipment | |
| CN210193069U (en) | Internal take-up meter counter testing device | |
| CN203705083U (en) | Optical fiber temperature measurement host | |
| CN111521917A (en) | Anti-interference measurement system for partial discharge of generator | |
| CN205539331U (en) | 1000kVGIS ultrasonic wave on -line measuring device | |
| CN111413085A (en) | Power transformer mechanical state detection system | |
| CN204649901U (en) | GIS office is placed on line monitoring system |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210709 |