CN115096356A - Partial discharge and temperature and humidity online monitoring system and method for ring main unit - Google Patents

Partial discharge and temperature and humidity online monitoring system and method for ring main unit Download PDF

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Publication number
CN115096356A
CN115096356A CN202210599751.4A CN202210599751A CN115096356A CN 115096356 A CN115096356 A CN 115096356A CN 202210599751 A CN202210599751 A CN 202210599751A CN 115096356 A CN115096356 A CN 115096356A
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China
Prior art keywords
temperature
sensor
humidity
ring main
main unit
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CN202210599751.4A
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Chinese (zh)
Inventor
翟鹏飞
马求相
陈添旭
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Ceepower Co ltd
Fujian Ceepower Co ltd
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Ceepower Co ltd
Fujian Ceepower Co ltd
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Priority to CN202210599751.4A priority Critical patent/CN115096356A/en
Publication of CN115096356A publication Critical patent/CN115096356A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/24—Circuit arrangements for boards or switchyards
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H02B1/565—Cooling; Ventilation for cabinets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Human Computer Interaction (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The invention relates to a partial discharge and temperature and humidity online monitoring system for a ring main unit, which comprises a temperature measuring component and a fusion component, wherein the temperature measuring component comprises a temperature sensor and a wireless sending module; the fusion assembly comprises an ultrahigh frequency sensor, an ultrasonic sensor, a temperature and humidity sensor, an acquisition module, a wireless receiving module and a shell, wherein the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor are respectively electrically connected with the acquisition module and send data to the acquisition module; and the data of the temperature sensor is sent to the acquisition module. Compared with the prior art, the invention can effectively integrate the online temperature monitoring, the ultrasonic signal detection, the partial discharge detection and the online humidity monitoring of the ring main unit, data can be unified to the acquisition module and then sent to the background server by the acquisition module, and the invention has the characteristics of low cost and quick installation mode; the accuracy of the monitoring can be improved.

Description

Partial discharge and temperature and humidity online monitoring system and method for ring main unit
Technical Field
The invention relates to the technical field of ring main units, in particular to a partial discharge and temperature and humidity online monitoring system and method for a ring main unit.
Background
Partial discharge detection is the most intuitive detection means reflecting the insulation performance of electrical equipment at present, and the existing partial discharge detection device for a switch cabinet generally adopts transient earth voltage (TEV for short), ultrasonic (AE for short) and ultrahigh frequency (UHF for short) monitoring technologies.
The switch cabinet temperature on-line monitoring system is developed based on a wireless temperature measurement technology and aims at measuring the temperature of a switch cabinet, the temperature of the switch cabinet can be monitored in real time at positions such as a bus bar, an upper contact, a lower contact, a cable joint and the like, and operation and maintenance personnel and a remote monitoring center can master the operation condition of field equipment conveniently.
Switch cabinet humidity on-line monitoring and dehumidification control system monitors switch cabinet cable chamber ambient humidity, can control its hot plate to heat up the dehumidification to the cable chamber when humidity exceeds standard, can effectively deal with switch cabinet cable chamber and appear that humidity is too high and lead to risks such as insulating properties change.
More information about the above solution can also be found in the following documents:
in the chinese invention patent with patent publication No. CN 113049920a, a switch cabinet partial discharge and temperature online detection system and a detection method thereof are disclosed, which specifically include a partial discharge detection module, a temperature detection module, a data processing module, an alarm unit and a power supply module; the partial discharge detection module comprises a partial discharge sensor, a filter circuit and an amplifying circuit, the temperature detection module comprises a temperature sensor and an antenna sending device, the data processing module comprises an analysis host and an antenna receiving unit, and the alarm unit is a buzzer. The invention can realize real-time online detection of the insulation degradation trend and the temperature change trend of the switch cabinet, can determine the maintenance time and maintenance measures according to different early warning levels of the buzzer, can find the insulation defect of the switch cabinet in time, and can quickly position the fault position of the switch cabinet.
In the chinese utility model patent of patent publication No. CN 211977988U, cubical switchboard partial discharge and temperature on-line monitoring device is disclosed, the outside of monitoring case is all arranged in to UHF antenna sensor and noise sensor's response end, left side cavity is arranged in to the alarm, the lateral wall of monitoring case is arranged in to the display screen, miniature passive wireless temperature measurement sensor places in right side cavity, magnetically soft alloy piece is two, and arrange miniature passive wireless temperature measurement sensor's both ends respectively in, two magnetically soft alloy piece other ends are equipped with buckle and snap ring respectively, miniature passive wireless temperature measurement sensor shell is metal casing, can get rid of external interference signal, can automatic alarm, can get rid of interference switch's pulse impact interference, can avoid the influence to former equipment, can also show monitoring state etc. in real time.
In the process of implementing the invention, the inventor finds that the following problems exist in the prior art:
in the prior art, the traditional switch cabinet partial discharge monitoring, wireless cable head temperature measurement, humidity on-line monitoring and dehumidification control are three systems which are independent of each other, the data of the traditional switch cabinet partial discharge monitoring, the wireless cable head temperature measurement, the humidity on-line monitoring and the dehumidification control cannot be communicated with each other, the linkage function of system monitoring cannot be exerted, and the repeated investment is also caused.
Disclosure of Invention
Therefore, the system and the method for local discharge and temperature and humidity online monitoring of the ring main unit are needed to be provided, and the technical problems that in the prior art, the traditional switch cabinet local discharge monitoring, wireless cable head temperature measurement, humidity online monitoring and dehumidification control are three systems, are independent of each other, and are designed, constructed, operated and maintained, and data of the three systems cannot be communicated with each other are solved.
In order to achieve the above object, in a first aspect, the present invention provides an partial discharge and temperature and humidity online monitoring system for a ring main unit, including:
the temperature measurement assembly comprises a temperature sensor and a wireless transmission module, and the temperature sensor is used for acquiring a temperature signal of a cable joint of the ring main unit; and
the system comprises a fusion assembly, a power supply and a power supply, wherein the fusion assembly comprises an ultrahigh frequency sensor, an ultrasonic sensor, a temperature and humidity sensor, an acquisition module, a wireless receiving module and a shell, the ultrahigh frequency sensor, the ultrasonic sensor, the temperature and humidity sensor, the acquisition module and the wireless receiving module are arranged in the shell, the shell is arranged in a cable chamber of the ring main unit and used for detecting a partial discharge signal of the ring main unit, the ultrasonic sensor is used for detecting an ultrasonic signal of the ring main unit, the temperature and humidity sensor is used for monitoring the environment temperature and humidity of the cable chamber of the ring main unit, and the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor are respectively electrically connected with the acquisition module and send data to the acquisition module;
the temperature sensor is electrically connected with the wireless transmitting module, the wireless transmitting module is in communication connection with the wireless receiving module, the wireless receiving module is electrically connected with the acquisition module, and the temperature sensor transmits data to the acquisition module through the matching of the wireless transmitting module and the wireless receiving module;
the fusion component adopts data segmentation, an extreme value method and a secondary difference method to remove interference data of the collected data and extract discharge information.
Different from the prior art, the temperature sensor detects the temperature signal of the cable joint of the ring main unit, the temperature sensor transmits data to the acquisition module through the cooperation of the wireless transmission module and the wireless receiving module, the fusion assembly integrates the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor together, can detect the partial discharge signal, the ultrasonic signal and the environment temperature and humidity of the ring main unit, can effectively monitor the temperature of the ring main unit, detect the ultrasonic signal, detect the partial discharge and monitor the humidity online, and is fused together, so that the data can be unified to the acquisition module and then transmitted to the background server by the acquisition module, and the ring main unit temperature monitoring system has the characteristics of low cost and quick installation mode; the ring main unit is monitored through the ultrasonic sensor and the ultrahigh frequency sensor, mutual authentication can be realized, and the monitoring accuracy is improved; in the data acquisition of the fusion component, the data processing of the ultrahigh frequency sensor and the ultrasonic sensor and the extraction of the discharge information are key, and the interference data elimination and the extraction of the discharge information are carried out on the acquired data through data segmentation, an extreme value method and a secondary difference method, so that the monitoring accuracy is further improved.
As an embodiment of the present invention, the fusion component further includes a dehumidifying heating plate and a control circuit, the control circuit is connected to and controls the dehumidifying heating plate, the temperature and humidity sensor is electrically connected to the control circuit, and the control circuit controls the dehumidifying heating plate according to the environment temperature and humidity of the cable chamber of the ring main unit monitored by the temperature and humidity sensor.
So, can control its dehumidification hot plate and heat up the dehumidification to the cable chamber when humidity exceeds standard, can effectively deal with the looped netowrk cabinet cable chamber and appear that humidity is too high and lead to insulating properties to change scheduling risk.
As an embodiment of the present invention, the fusion component further includes a microcontroller, and the wireless receiving module, the collecting module, the control circuit, and the temperature and humidity sensor are electrically connected to the microcontroller respectively.
Therefore, data signals collected by the temperature sensor, the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor can be processed through the microcontroller, interference data are eliminated, and the accuracy of the data is improved.
As an implementation manner of the present invention, the partial discharge and humiture online monitoring system includes more than two temperature measurement assemblies and more than two fusion assemblies, one temperature measurement assembly is correspondingly provided with one fusion assembly, the temperature measurement assembly includes three temperature sensors, the three temperature sensors are respectively arranged on a three-phase cable connector of the ring main unit, and the three temperature sensors respectively send signals to the wireless receiving module through the wireless sending module.
So, can monitor more than two looped netowrk cabinets simultaneously, can monitor the temperature that three-phase cable connects respectively through three temperature sensor.
As an embodiment of the present invention, the monitoring device further includes a display terminal, the two or more fusion assemblies are electrically connected to the display terminal, respectively, and the display terminal includes a power supply circuit for supplying power to the two or more fusion assemblies.
Therefore, after the cable head temperature information, the local discharge information in the cabinet and the temperature and humidity information in the cabinet are collected by the fusion component, the information is uploaded to the display terminal through RS-485 communication, the display terminal receives the information of all the fusion terminals of the ring main units, and the running information of all the ring main units is displayed on the liquid crystal display with the resolution of 256 × 128.
As an implementation manner of the present invention, the temperature measurement assembly further includes an induction power-taking module, the induction power-taking module is configured to supply power to the temperature sensor, the induction power-taking module includes an induction antenna and an induction power-taking circuit, the induction antenna is electrically connected to the induction power-taking circuit, and the induction power-taking circuit is electrically connected to the temperature sensor.
So, can get the power module for temperature sensor power supply through the response, need not to set up the battery, non-maintaining, temperature measurement stability is good.
As an embodiment of the present invention, the cable joint includes an insulation plug, an insulation plug protection cap, and a shield cap, the temperature sensor being disposed inside the insulation plug protection cap; or
The temperature sensor is poured in the insulating plug; or alternatively
The temperature sensor is disposed in the shield cap.
Therefore, the temperature sensor can be conveniently arranged, and modularization and standardization of the temperature measuring structure are realized.
As an embodiment of the present invention, the housing may be attached to the cable chamber sidewall by adsorption or by a fastener.
Therefore, the shell can be conveniently mounted and dismounted.
As an embodiment of the invention, the method for processing data by the fusion component comprises the following steps:
s1, collecting an array A;
s2, detecting the length of the array A;
s3, determining the length dn of the division window, and dividing the array A;
s4, solving the maximum value in each partition, and calculating the square sum to obtain an array B and an array C, wherein each partition is taken as an element, the elements in the array B are the square sums of all original data in the sequential partitions, and the array C is the maximum value in each sequential partition;
s5, searching the position of the local maximum value by the element in the array B, searching the corresponding element in the array C according to the position of the local maximum value, and obtaining the real maximum value.
Therefore, the data can be segmented, the maximum value is obtained, the sum of squares is calculated, the true maximum value is obtained, and the authenticity and the accuracy of data extraction are improved.
In order to achieve the above object, in a second aspect, the present invention provides a method for local discharge and temperature and humidity online monitoring of a ring main unit, including: the partial discharge and temperature and humidity online monitoring system for the ring main unit is provided by any one of the above inventors;
s101, respectively installing a temperature sensor in a three-phase circuit of a cable joint of the ring main unit to be detected, wherein the temperature sensors are integrated in the cable joint and are powered by adopting an induction power taking mode;
s102, wirelessly transmitting the temperature signals acquired by the temperature sensors to the fusion component;
s103, processing data collected by a temperature sensor, an ultrahigh frequency sensor, an ultrasonic sensor and a temperature and humidity sensor by a fusion component, and removing interference data and extracting discharge information from the collected data by adopting a data segmentation method, an extreme value method and a secondary difference method;
s104, after collecting cable head temperature information, partial discharge information in the ring main unit and temperature and humidity information in the ring main unit, the fusion component transmits the temperature information, the partial discharge information and the temperature and humidity information to a display terminal through wires;
and S105, the display terminal receives the information of the fusion components of all the ring main units, if the data is abnormal, abnormal information is displayed and recorded to form a query alarm record, and the display terminal uploads all the information to the upper-level monitoring system.
Different from the prior art, according to the monitoring method of the technical scheme, the temperature sensor detects the temperature signal of the cable joint of the ring main unit, the temperature sensor transmits data to the acquisition module through the cooperation of the wireless sending module and the wireless receiving module, the fusion component integrates the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor together, the partial discharge signal, the ultrasonic signal and the environment temperature and humidity of the ring main unit can be detected, the online temperature monitoring, the ultrasonic signal detection, the partial discharge detection and the online humidity monitoring of the ring main unit can be effectively integrated, the data can be unified to the acquisition module and then transmitted to the background server through the acquisition module, and the monitoring method has the characteristics of low cost and quick installation mode; the ring main unit is monitored through the ultrasonic sensor and the ultrahigh frequency sensor, mutual authentication can be realized, and the monitoring accuracy is improved; in the data acquisition of the fusion component, the data processing of the ultrahigh frequency sensor and the ultrasonic sensor and the extraction of the discharge information are key, and the interference data elimination and the extraction of the discharge information are carried out on the acquired data through data segmentation, an extreme value method and a secondary difference method, so that the monitoring accuracy is further improved.
The above description of the present invention is only an outline of the present invention, and in order to make the technical solution of the present invention more clearly understood by those skilled in the art, the present invention may be implemented based on the content described in the text and drawings of the specification, and in order to make the above object and other objects, features, and advantages of the present invention more easily understood, the following description will be given in conjunction with the embodiments of the present invention and the drawings.
Drawings
The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the present application, as well as others related thereto, and are not to be construed as limiting the application.
In the drawings of the specification:
fig. 1 is a system block diagram of an partial discharge and temperature and humidity online monitoring system for a ring main unit according to an embodiment of the present application;
FIG. 2 is a system diagram of a thermometric assembly and a fusion assembly according to one embodiment of the present application;
FIG. 3 is a system block diagram of a thermometric assembly according to one embodiment of the present application;
FIG. 4 is a system block diagram of a fusion component according to one embodiment of the present application;
FIG. 5 is a functional block diagram of a display terminal according to an embodiment of the present application;
FIG. 6 is a flow diagram of data processing according to one embodiment of the present application;
fig. 7 is a flowchart of an partial discharge and temperature and humidity online monitoring method for a ring main unit according to an embodiment of the present application.
The reference numerals referred to in the above figures are explained below:
11. a temperature sensor is arranged at the bottom of the shell,
12. a wireless sending module for sending out the wireless data,
13. an induction antenna is provided, which is provided with a plurality of induction coils,
14. an induction power-taking circuit is provided,
15. a filter circuit for filtering the received signal and a control circuit for controlling the filter circuit,
16. a first micro-controller for controlling the operation of the electronic device,
2. the fusion component is used for fusing the two components,
21. an ultra-high frequency sensor is provided,
22. a temperature and humidity sensor for measuring the temperature and humidity of the air,
23. a collection module for collecting the collected data of the object,
24. a wireless receiving module for receiving the wireless data,
25. an ultrasonic sensor is provided, which is provided with a plurality of ultrasonic sensors,
26. a dehumidifying heating plate is arranged on the inner wall of the box body,
27. a control circuit for controlling the operation of the electronic device,
28. a second micro-controller for controlling the operation of the microprocessor,
29. a filter circuit with a head is arranged on the filter circuit,
30. a signal amplification circuit for amplifying a signal from a signal source,
3. and displaying the terminal.
Detailed Description
In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are merely examples for more clearly illustrating the technical solutions of the present application, and therefore, the present application is not limited thereto.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution as long as there is no technical contradiction or conflict.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe specific embodiments and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order between such entities or operations.
Without further limitation, in this application, the use of the phrases "comprising," "including," "having," or other similar expressions, is intended to cover a non-exclusive inclusion, and these expressions do not exclude the presence of additional elements in a process, method, or article that includes the elements, such that a process, method, or article that includes a list of elements may include not only those elements defined, but also other elements not expressly listed or inherent to such process, method, or article.
As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of sets", "a plurality of times", and the like, unless otherwise specifically defined.
In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application should be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.
In the prior art, the traditional switch cabinet partial discharge monitoring, wireless cable head temperature measurement, humidity on-line monitoring and dehumidification control are three systems which are independent of each other, the data of the traditional switch cabinet partial discharge monitoring, the wireless cable head temperature measurement, the humidity on-line monitoring and the dehumidification control cannot be communicated with each other, the linkage function of system monitoring cannot be exerted, and the repeated investment is also caused.
The applicant researches and discovers that a temperature sensor, an ultrahigh frequency sensor, an ultrasonic sensor and a temperature and humidity sensor can be integrated together, data can be unified to an acquisition module, and then the data can be sent to a background server by the acquisition module, and the system has the characteristics of low cost and quick installation mode; the ring main unit is monitored through the ultrasonic sensor and the ultrahigh frequency sensor, mutual authentication can be realized, and the monitoring accuracy is improved; interference data elimination and discharge information extraction are carried out on the collected data through data segmentation, an extreme value method and a secondary difference method, and the monitoring accuracy is further improved.
The partial discharge and temperature and humidity online monitoring system and method for the ring main unit in the embodiment can be applied to various aspects in the technical field of ring main units.
According to some embodiments of the present application, please refer to fig. 1 to 7, the present embodiment relates to an on-line monitoring system for partial discharge and temperature and humidity of a ring main unit, comprising a temperature measuring component and a fusion component 2, wherein the temperature measuring component comprises a temperature sensor 11 and a wireless sending module 12, and the temperature sensor 11 is used for collecting a temperature signal of a cable joint of the ring main unit;
the fusion component 2 comprises an ultrahigh frequency sensor 21, an ultrasonic sensor 25, a temperature and humidity sensor 22, an acquisition module 23, a wireless receiving module 24 and a shell, wherein the ultrahigh frequency sensor 21, the ultrasonic sensor 25, the temperature and humidity sensor 22, the acquisition module 23 and the wireless receiving module 24 are arranged in the shell, the shell is arranged in a cable chamber of the ring main unit, the ultrahigh frequency sensor 21 is used for detecting a partial discharge signal of the ring main unit, the ultrasonic sensor 25 is used for detecting an ultrasonic signal of the ring main unit, the temperature and humidity sensor 22 is used for monitoring the environment temperature and humidity of the cable chamber of the ring main unit, and the ultrahigh frequency sensor 21, the ultrasonic sensor 25 and the temperature and humidity sensor 22 are respectively electrically connected with the acquisition module 23 and send data to the acquisition module 23;
the temperature sensor 11 is electrically connected with the wireless sending module 12, the wireless sending module 12 is in communication connection with the wireless receiving module 24, the wireless receiving module 24 is electrically connected with the acquisition module 23, and the temperature sensor 11 sends data to the acquisition module 23 through the cooperation of the wireless sending module 12 and the wireless receiving module 24;
the fusion component 2 performs interference data elimination and discharge information extraction on the acquired data by adopting a data segmentation method, an extreme value method and a secondary difference method.
In this embodiment, the temperature signal collected by the temperature sensor 11 is transmitted to the fusion module 2 through ZIGBEE.
Since the insulation strength of the insulator of the electrical equipment is high, it has a high breakdown field strength. Therefore, when partial discharge occurs in the insulator of the power equipment, the breakdown process is very rapid, and pulse current with the rise time less than 1ns is generated, and electromagnetic waves can be excited, and the frequency of the electromagnetic waves is in the order of GHz, namely Ultra High Frequency (UHF) electromagnetic waves. The frequency of the ultrahigh frequency electromagnetic wave generated by the partial discharge is approximately between 300MHz and 3 GHz. The basic principle of the uhf detection method is to detect an uhf electromagnetic wave signal generated when a partial discharge occurs in an electric power device by using an uhf sensor 21. Depending on the field device, both built-in uhf sensors 21 and external uhf sensors 21 may be used.
The ultrasonic sensor 25 is a sensor that converts an ultrasonic wave signal into another energy signal (generally, an electric signal). Ultrasonic waves are mechanical waves with a vibration frequency higher than 20 kHz.
The temperature and humidity sensor 22 uses a temperature and humidity integrated probe as a temperature measuring element, collects temperature and humidity signals, and converts the temperature and humidity signals into current signals or voltage signals having a linear relationship with the temperature and humidity after the temperature and humidity signals are processed by circuits such as voltage stabilization filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection and the like.
Mcu in the figure is a single chip microcomputer, which is called a Microcontroller in the name of chinese for short for an english Microcontroller Unit.
In this embodiment, the sampling frequency of the ultrahigh frequency signal and the ultrasonic signal needs to be over 100kHz to ensure that the acoustic signal is completely restored.
Therefore, the temperature sensor 11 detects a temperature signal of a cable joint of the ring main unit, the temperature sensor 11 transmits data to the acquisition module 23 through the matching of the wireless transmission module 12 and the wireless receiving module 24, the fusion component 2 integrates the ultrahigh frequency sensor 21, the ultrasonic sensor 25 and the temperature and humidity sensor 22 together, so that a partial discharge signal, an ultrasonic signal and environment temperature and humidity of the ring main unit can be detected, the online temperature monitoring, the ultrasonic signal detection, the partial discharge detection and the online humidity monitoring of the ring main unit can be effectively realized, the data can be unified to the acquisition module 23 and then transmitted to the background server by the acquisition module 23, and the ring main unit has the characteristics of low cost and quick installation mode; the ring main unit is monitored through the ultrasonic sensor 25 and the ultrahigh frequency sensor 21, mutual authentication can be realized, and the monitoring accuracy is improved; in the data acquisition of the fusion component 2, the data processing of the ultrahigh frequency sensor 21 and the ultrasonic sensor 25 and the extraction of the discharge information are key, and the interference data elimination and the extraction of the discharge information are performed on the acquired data through data segmentation, an extreme value method and a secondary difference method, so that the monitoring accuracy is further improved.
According to some embodiments of the present application, optionally, the temperature measuring assembly further includes a filter circuit 15 and a first microcontroller 16, the temperature sensor 11 is electrically connected to the filter circuit 15, the filter circuit 15 is electrically connected to the first microcontroller 16, and the microcontroller is electrically connected to the wireless transmission module 12. Can filter the temperature signal of temperature sensor 11 monitoring through filter circuit 15, first microcontroller 16 handles the back to temperature signal, and the collection module 22 of giving fusion subassembly 2 again improves the authenticity of data.
According to some embodiments of the present application, optionally, the fusion component 2 further includes a dehumidification heating plate 26 and a control circuit 27, the control circuit 27 is connected to control the dehumidification heating plate 26, the temperature and humidity sensor 22 is electrically connected to the control circuit 27, and the control circuit 27 controls the dehumidification heating plate 26 according to the environment temperature and humidity of the cable chamber of the ring main unit monitored by the temperature and humidity sensor 22.
So, can control its dehumidification hot plate 26 and heat up the dehumidification to the cable chamber when humidity exceeds standard, can effectively deal with the looped netowrk cabinet cable chamber and appear that humidity is too high and lead to insulating properties to change scheduling risk.
According to some embodiments of the present application, optionally, the fusion component 2 further includes a second microcontroller 28, and the wireless receiving module 24, the collecting module 23, the control circuit 27, and the temperature and humidity sensor 22 are electrically connected to the second microcontroller 28, respectively.
The fusion component 2 further comprises a head filter circuit 29 and a signal amplification circuit 30, the ultrahigh frequency sensor 21 is electrically connected with the head filter circuit 29, the head filter circuit 29 is electrically connected with the signal amplification circuit 30, and the signal amplification circuit 30 is electrically connected with the acquisition module 23. In this way, the data monitored by the ultrahigh frequency sensor 21 can be filtered and amplified through the headed filter circuit 29 and the signal amplifying circuit 30, so that the subsequent processing of the data is facilitated.
In this way, the second microcontroller 28 can process the data signals collected by the temperature sensor 11, the ultrahigh frequency sensor 21, the ultrasonic sensor 25 and the temperature and humidity sensor 22, so as to eliminate interference data and improve the accuracy of the data.
According to some embodiments of the application, optionally, the partial discharge and humiture online monitoring system includes more than two temperature measurement components and more than two fusion components 2, one temperature measurement component is provided with one fusion component 2 correspondingly, the temperature measurement component includes three temperature sensor 11, three temperature sensor 11 sets up respectively on the three-phase cable joint of looped netowrk cabinet, three temperature sensor 11 sends the signal for wireless receiving module 24 through wireless sending module 12 respectively.
So, can monitor more than two looped netowrk cabinets simultaneously, can monitor the temperature of three-phase cable joint respectively through three temperature sensor 11.
According to some embodiments of the present application, optionally, the monitoring device further includes a display terminal 3, the two or more fusion assemblies 2 are electrically connected to the display terminal 3, respectively, and the display terminal 3 includes a power circuit for supplying power to the two or more fusion assemblies 2.
After collecting the temperature information of the cable head and the partial discharge information in the cabinet, the fusion component 2 uploads the information to the display terminal 3 through RS-485 communication. And the display terminal 3 receives the information of all the ring main unit fusion assemblies 2, displays the running information of all the ring main units on a liquid crystal display with 256 × 128 resolution, and displays and records abnormal information if the running information of all the ring main units is abnormal, so as to form a querable alarm record. The display terminal 3 is responsible for providing power for the fusion assembly 2 besides finishing communication with all the ring main unit fusion assemblies 2. The hardware block diagram of the display terminal 3 is shown in fig. 5.
The display terminal 3 also has a setting function, and can set functions such as ambient temperature, ambient humidity, cable head temperature, partial discharge alarm threshold value, communication parameters and the like in a system menu. The display terminal is provided with a function of uploading all monitoring and control information to a previous-level monitoring system.
Therefore, after cable head temperature information, partial discharge information in the cabinet and temperature and humidity information in the cabinet are collected by the fusion component 2, the information is uploaded to the display terminal 3 through RS-485 communication, the display terminal 3 receives all the fusion terminal information of the ring main units, and all the operation information of the ring main units is displayed on a liquid crystal display with 256 × 128 resolution.
According to some embodiments of the present application, optionally, the temperature measurement assembly further includes an induction power-taking module, the induction power-taking module is configured to supply power to the temperature sensor 11, the induction power-taking module includes an induction antenna 13 and an induction power-taking circuit 14, the induction antenna 13 is electrically connected to the induction power-taking circuit 14, and the induction power-taking circuit 14 is electrically connected to the temperature sensor 11.
The induction electricity taking device is a device for obtaining a power supply by utilizing a capacitance effect of a polar plate assembly arranged in a cable head and utilizing an alternating current through a polar plate capacitance coupling principle, and comprises an energy taking polar plate assembly and a power supply conversion module (converting electric energy obtained by an energy taking polar plate into required direct current voltage).
So, can get the power supply module for temperature sensor 11 through the response, need not to set up the battery, non-maintaining, temperature measurement stability is good.
According to some embodiments of the present application, optionally, the cable joint comprises an insulation plug, an insulation plug protective cap, and a shielding cap, the temperature sensor 11 being disposed within the insulation plug protective cap; or alternatively
The temperature sensor 11 is poured in the insulating plug; or
The temperature sensor 11 is provided in the shield cap.
In this embodiment, the insulating plug protective cap, and the shielding cap are prior art of the cable, and the specific structures are not similar here.
Therefore, the temperature sensor 11 can be conveniently arranged, and the modularization and the standardization of the temperature measuring structure are realized.
According to some embodiments of the application, the housing may optionally be attached to the cable compartment sidewalls by suction or by fasteners.
Therefore, the shell can be conveniently mounted and dismounted.
According to some embodiments of the present application, optionally, the method for processing data by the fusion component 2 includes the following steps:
please refer to fig. 6;
s1, collecting an array A;
s2, detecting the length of the array A;
s3, determining the length dn of the division window, and dividing the array A;
s4, solving the maximum value in each partition, and calculating the square sum to obtain an array B and an array C, wherein each partition is taken as an element, the elements in the array B are the square sums of all original data in the sequential partitions, and the array C is the maximum value in each sequential partition;
s5, searching the position of the local maximum value by the element in the array B, searching the corresponding element in the array C according to the position of the local maximum value, and obtaining the real maximum value.
Therefore, the data can be segmented, the maximum value is obtained, the sum of squares is calculated, the true maximum value is obtained, and the authenticity and the accuracy of data extraction are improved.
In a second aspect, the present embodiment further relates to a method for local discharge and temperature and humidity online monitoring of a ring main unit, including: the partial discharge and temperature and humidity online monitoring system for the ring main unit, provided by any one of the above inventors;
please refer to fig. 7;
s101, respectively installing a temperature sensor 11 in a three-phase circuit of a cable joint of a ring main unit to be tested, integrating the temperature sensors 11 in the cable joint, and supplying power to the temperature sensors 11 in an induction power supply mode;
s102, wirelessly transmitting the temperature signal acquired by the temperature sensor 11 to the fusion component 2;
s103, the fusion component 2 processes data collected by the temperature sensor 11, the ultrahigh frequency sensor 21, the ultrasonic sensor 25 and the temperature and humidity sensor 22, and interference data elimination and discharge information extraction are carried out on the collected data by adopting a data segmentation method, an extreme value method and a secondary difference method;
s104, after collecting cable head temperature information, partial discharge information in the ring main unit and temperature and humidity information in the ring main unit, the fusion component 2 transmits the information to the display terminal 3 through a wire;
s105, the display terminal 3 receives the information of the fusion assemblies 2 of all the ring main units, if the data is abnormal, abnormal information is displayed and recorded to form a query alarm record, and all the information is uploaded to the upper-level monitoring system by the display terminal 3.
Different from the prior art, according to the monitoring method of the technical scheme, the temperature sensor 11 detects a temperature signal of a cable joint of the ring main unit, the temperature sensor 11 transmits data to the acquisition module 23 through the cooperation of the wireless transmission module 12 and the wireless receiving module 24, the fusion component 2 integrates the ultrahigh frequency sensor 21, the ultrasonic sensor 25 and the temperature and humidity sensor 22 together, so that a partial discharge signal, an ultrasonic signal and environmental temperature and humidity of the ring main unit can be detected, online temperature monitoring, ultrasonic signal detection, partial discharge detection and online humidity monitoring of the ring main unit can be effectively realized, the data can be unified to the acquisition module 23 and then transmitted to the background server through the acquisition module 23, and the monitoring method has the characteristics of low cost and quick installation; the ring main unit is monitored through the ultrasonic sensor 25 and the ultrahigh frequency sensor 21, mutual authentication can be realized, and the monitoring accuracy is improved; in the data acquisition of the fusion component 2, the data processing of the ultrahigh frequency sensor 21 and the ultrasonic sensor 25 and the extraction of the discharge information are the key, and the interference data elimination and the extraction of the discharge information are performed on the acquired data through data segmentation, an extreme value method and a secondary difference method, so that the monitoring accuracy is further improved.
In this embodiment, the sensor converts a specific measured signal into a certain usable signal according to a certain rule through the sensing element and the conversion element and outputs the usable signal so as to meet the requirements of information transmission, processing, recording, displaying, controlling and the like, and the sensor can sense physical quantities such as force, temperature, light, sound, chemical components and the like and can convert the physical quantities into electrical quantities such as voltage, current and the like according to a certain rule or convert the electrical quantities into on-off of a circuit. The sensor generally consists of a sensitive element and a conversion element, and is the first link for realizing automatic detection and white motion control. The sensor is used for converting non-electrical quantity into on-off of an electrical star or a circuit, so that measurement, transmission, processing and control are conveniently realized.
In this embodiment, the controller is used for receiving the signal transmitted by the sensor and controlling the actuator or the execution unit according to the signal transmitted by the sensor, and the controller refers to a master device which controls the starting, speed regulation, braking and reversing of the motor by changing the wiring of the master circuit or the control circuit and changing the resistance value in the circuit according to a preset sequence. The system consists of a program counter, an instruction register, an instruction decoder, a time sequence generator and an operation controller, and is a decision mechanism for issuing commands, namely, the decision mechanism completes coordination and commands the operation of the whole computer system.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.

Claims (10)

1. The utility model provides a partial discharge and humiture on-line monitoring system for looped netowrk cabinet, which characterized in that includes:
the temperature measuring assembly comprises a temperature sensor and a wireless sending module, and the temperature sensor is used for acquiring a temperature signal of a cable joint of the ring main unit; and
the system comprises a fusion assembly, a power supply and a power supply, wherein the fusion assembly comprises an ultrahigh frequency sensor, an ultrasonic sensor, a temperature and humidity sensor, an acquisition module, a wireless receiving module and a shell, the ultrahigh frequency sensor, the ultrasonic sensor, the temperature and humidity sensor, the acquisition module and the wireless receiving module are arranged in the shell, the shell is arranged in a cable chamber of the ring main unit and used for detecting a partial discharge signal of the ring main unit, the ultrasonic sensor is used for detecting an ultrasonic signal of the ring main unit, the temperature and humidity sensor is used for monitoring the environment temperature and humidity of the cable chamber of the ring main unit, and the ultrahigh frequency sensor, the ultrasonic sensor and the temperature and humidity sensor are respectively electrically connected with the acquisition module and send data to the acquisition module;
the temperature sensor is electrically connected with the wireless transmitting module, the wireless transmitting module is in communication connection with the wireless receiving module, the wireless receiving module is electrically connected with the acquisition module, and the temperature sensor transmits data to the acquisition module through the cooperation of the wireless transmitting module and the wireless receiving module;
the fusion component adopts data segmentation, an extreme value method and a secondary difference method to remove interference data of the collected data and extract discharge information.
2. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the fusion component further comprises a dehumidifying heating plate and a control circuit, the control circuit is connected with and controls the dehumidifying heating plate, the temperature and humidity sensor is electrically connected with the control circuit, and the control circuit controls the dehumidifying heating plate according to the temperature and humidity of the environment of the cable chamber of the ring main unit monitored by the temperature and humidity sensor.
3. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 2, wherein the fusion component further comprises a microcontroller, and the wireless receiving module, the acquisition module, the control circuit, and the temperature and humidity sensor are electrically connected to the microcontroller respectively.
4. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the partial discharge and temperature and humidity online monitoring system comprises more than two temperature measurement assemblies and more than two fusion assemblies, one temperature measurement assembly is correspondingly provided with one fusion assembly, the temperature measurement assembly comprises three temperature sensors, the three temperature sensors are respectively arranged on a three-phase cable joint of the ring main unit, and the three temperature sensors respectively send signals to the wireless receiving module through the wireless sending module.
5. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 4, wherein the partial discharge and temperature and humidity online monitoring system further comprises a display terminal, more than two of the fusion components are electrically connected with the display terminal respectively, and the display terminal comprises a power circuit for supplying power to more than two of the fusion components.
6. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the temperature measuring assembly further comprises an induction power taking module, the induction power taking module is used for supplying power to the temperature sensor, the induction power taking module comprises an induction antenna and an induction power taking circuit, the induction antenna is electrically connected with the induction power taking circuit, and the induction power taking circuit is electrically connected with the temperature sensor.
7. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the cable joint includes an insulation plug, an insulation plug protection cap and a shielding cap, and the temperature sensor is disposed in the insulation plug protection cap; or
The temperature sensor is poured in the insulating plug; or alternatively
The temperature sensor is disposed in the shield cap.
8. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the housing is attachable or mounted on the sidewall of the cable chamber through a fastener.
9. The partial discharge and temperature and humidity online monitoring system for the ring main unit according to claim 1, wherein the data processing method by the fusion component comprises the following steps:
s1, collecting an array A;
s2, detecting the length of the array A;
s3, determining the length dn of the division window, and dividing the array A;
s4, solving the maximum value in each partition, and calculating the sum of squares to obtain an array B and an array C, wherein each partition is taken as an element, the elements in the array B are the sum of squares of all original data in the sequential partitions, and the array C is the maximum value in the sequential partitions;
s5, searching the position of the local maximum value by the elements in the array B, searching the corresponding elements in the array C according to the position of the local maximum value, and obtaining the real maximum value.
10. The utility model provides a local discharge and humiture on-line monitoring method for looped netowrk cabinet which characterized in that includes: the partial discharge and temperature and humidity online monitoring system for the ring main unit according to any one of claims 1 to 9;
s101, respectively installing a temperature sensor in a three-phase circuit of a cable joint of the ring main unit to be detected, wherein the temperature sensors are integrated in the cable joint and are powered by adopting an induction power taking mode;
s102, wirelessly transmitting the temperature signals acquired by the temperature sensors to the fusion component;
s103, processing data collected by a temperature sensor, an ultrahigh frequency sensor, an ultrasonic sensor and a temperature and humidity sensor by a fusion component, and removing interference data and extracting discharge information from the collected data by adopting a data segmentation method, an extreme value method and a secondary difference method;
s104, after collecting cable head temperature information, partial discharge information in the ring main unit and temperature and humidity information in the ring main unit, the fusion component transmits the information to a display terminal through a wire;
and S105, the display terminal receives the information of the fusion components of all the ring main units, if the data is abnormal, abnormal information is displayed and recorded to form a query alarm record, and the display terminal uploads all the information to the upper-level monitoring system.
CN202210599751.4A 2022-05-30 2022-05-30 Partial discharge and temperature and humidity online monitoring system and method for ring main unit Pending CN115096356A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024077675A1 (en) * 2022-10-14 2024-04-18 云南电网有限责任公司普洱供电局 Distributed online temperature monitoring system applied to power supply loop

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024077675A1 (en) * 2022-10-14 2024-04-18 云南电网有限责任公司普洱供电局 Distributed online temperature monitoring system applied to power supply loop

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