CN212622889U - Join in marriage on-line monitoring device of net elbow type cable joint state - Google Patents
Join in marriage on-line monitoring device of net elbow type cable joint state Download PDFInfo
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- CN212622889U CN212622889U CN202021286784.6U CN202021286784U CN212622889U CN 212622889 U CN212622889 U CN 212622889U CN 202021286784 U CN202021286784 U CN 202021286784U CN 212622889 U CN212622889 U CN 212622889U
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Abstract
The utility model relates to an online monitoring device who joins in marriage net elbow type cable joint state installs in cable joint's end cover, and superfrequency monitoring sensor is connected to the discharge signal acquisition unit, and power frequency voltage sensor is connected to power frequency voltage acquisition unit, and power frequency voltage acquisition unit and discharge signal acquisition unit's signal output part are connected to the communication unit, get the electric energy of electric unit through induction cable power frequency current mode collection. The ultrahigh frequency monitoring sensor has the advantages that the ultrahigh frequency monitoring sensor is arranged in the cable joint, so that the high-sensitivity detection of partial discharge signals can be ensured. The discharge signals are processed through multiple circuits, peak value holding of the discharge signals is achieved, the discharge signals can be collected at a low sampling rate (dozens of khZ to hundreds of kHz), and power consumption of a hardware circuit is greatly reduced. Meanwhile, each monitoring device can independently send sampling signals to the background server to process data, and the accuracy of the data is guaranteed.
Description
Technical Field
The utility model relates to a transmission of electricity and distribution cable's maintenance field especially relates to a join in marriage on-line monitoring device of net elbow type cable joint state.
Background
At present, in the field of power transmission and distribution, the application of the cable is wide, and the cable is difficult to avoid faults. And cable faults occur most of the time at the cable joint location.
As shown in fig. 1, the distribution network elbow type cable joint is widely applied to cable connection of a box transformer substation, a ring main unit and a branch box. The cable joint is manufactured and installed on a manual site, is limited by an installation process, has a defect rate far higher than that of a cable body, is complex in structure and serious in electric field distortion, and is easy to have insulation defects and generate a partial discharge phenomenon.
Therefore, partial discharge of a cable joint needs to be monitored, a monitoring method mainly comprises an HFCT (high frequency computed tomography) sensor and an ultrahigh frequency sensor at present, the HFCT sensor is easy to be interfered, the frequency band of the ultrahigh frequency sensor is more than 300MHz, and most field interference can be avoided, so the ultrahigh frequency sensor is generally adopted for detection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a join in marriage online monitoring device of net elbow type cable joint state adopts a built-in scheme to install in cable joint's end cover, including superfrequency monitoring sensor, power frequency voltage sensor, discharge signal acquisition unit, power frequency voltage acquisition unit, get electric unit and communication unit, superfrequency monitoring sensor is connected to filter circuit, filter circuit is connected to signal amplification circuit, signal amplification circuit is connected to peak hold circuit, peak hold circuit is connected to discharge signal acquisition unit, power frequency voltage sensor is connected to power frequency voltage acquisition unit, the signal output part of power frequency voltage acquisition unit and discharge signal acquisition unit is connected to communication unit, communication unit sends data to the backstage through wireless network, it gathers the electric energy to get electric unit through induction cable power frequency current mode, superfrequency monitoring sensor, power frequency voltage sensor, discharge signal acquisition unit, The power frequency voltage sensor, the discharge signal acquisition unit, the power frequency voltage acquisition unit and the communication unit are all installed in an end cover of the cable joint.
Further, get the electric unit and include current induction and get ability coil, power module and get the electric joint, current induction gets ability coil and power module and is connected, and power module's output voltage input gets the electric joint, get electric joint access monitoring devices.
Optionally, the communication unit uses wireless communication, and the wireless communication mode is 4G or NB-IOT.
Furthermore, the electric signals collected by the power frequency voltage collecting unit and the discharging signal collecting unit are wirelessly transmitted to the background server through the communication unit.
Optionally, the ultrahigh frequency monitoring sensor is an ultrahigh frequency PCB antenna, and the power frequency voltage acquisition unit is a voltage induction pole plate.
Optionally, the high-frequency monitoring sensor, the power frequency voltage acquisition unit, the discharge signal acquisition unit, the acquisition circuit, the power taking unit and the communication unit adopt an integrated structure and are attached to the inner side of the cable joint end cover.
According to the method and the device, the ultrahigh frequency monitoring sensor is built in the cable joint, so that accurate receiving of partial discharge signals can be guaranteed, meanwhile, the peak value is preserved through a peak value holding mode, the discharge signals can be collected at a lower sampling rate, and hardware circuit consumption is greatly reduced. Meanwhile, each monitoring device can independently send sampling signals to the background server to process data, and the accuracy of the data is guaranteed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the installation position of the on-line monitoring device of the present application.
Fig. 2 is a system connection diagram of the on-line monitoring device of the present application.
Fig. 3 is a schematic diagram of a processed discharge signal and a power frequency voltage signal received by a background server in the present application.
Fig. 4 is a schematic diagram of the discharge amplitude variation of the discharge signal in the present application.
Fig. 5 is a schematic diagram showing a change in discharge frequency of the discharge signal in the present application.
In the figure: 1-cable joint, 2-end cap.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
As shown in figure 1, the online monitoring device for the state of the distribution network elbow type cable joint mainly comprises an ultrahigh frequency monitoring sensor, a power frequency voltage acquisition unit, a discharge signal acquisition unit, an acquisition circuit, a power taking unit, a communication unit and a background server, wherein the high frequency monitoring sensor, the power frequency voltage acquisition unit, the discharge signal acquisition unit, the acquisition circuit, the power taking unit and the communication unit are of an integrated structure and are attached to the inner side of an end cover 2 of the distribution network elbow type cable joint 1.
As shown in fig. 2, the ultrahigh frequency monitoring sensor is connected to the filter circuit, the filter circuit is connected to the signal amplifying circuit, the signal amplifying circuit is connected to the peak holding circuit, the peak holding circuit is connected to the discharge signal collecting unit, the power frequency voltage sensor is connected to the power frequency voltage collecting unit, the signal output ends of the power frequency voltage collecting unit and the discharge signal collecting unit are connected to the communication unit, and the power taking unit collects electric energy in a cable power frequency circuit manner.
The communication unit is in communication connection with the background server in a wireless communication mode, and the wireless communication mode is 4G or NB-IOT. Electric signals acquired by the power frequency voltage acquisition unit and the discharge signal acquisition unit are transmitted to the background server through the wireless transmission of the communication unit
In this application, get the electric unit and include that current induction gets can coil, power module and get the electric joint, current induction gets can coil and power module and is connected, and power module's output voltage input gets the electric joint, gets among the electric joint inserts whole monitoring devices. The current induction energy-taking coil is installed on the cable body, and after the current induction energy-taking coil takes electricity, the output power of the current induction energy-taking coil is input to the monitoring device through the electricity-taking connector.
In this application, the superfrequency monitoring sensor is superfrequency PCB antenna, and power frequency voltage acquisition unit is voltage induction polar plate.
The monitoring device of this application in the in-service use process, when cable joint appearance defect, can produce the superfrequency signal when producing partial discharge.
The partial discharge signal of the cable joint can be induced by the built-in ultrahigh frequency PCB antenna, the output voltage signal of the ultrahigh frequency PCB antenna enters the acquisition circuit, the filtering processing is firstly carried out through the filter circuit to remove noise, then the signal amplification is carried out through the signal amplification circuit, the signal amplified enters the peak value holding circuit, after the peak value holding processing, the discharge signal acquisition unit acquires the processed discharge signal and transmits the discharge signal to the communication unit. And the power frequency voltage acquisition unit acquires a power frequency voltage signal and transmits the power frequency voltage signal to the communication unit.
Then, the communication unit transmits the processed signals collected by the discharge signal collecting unit and the power frequency voltage collecting unit to a background server, and the background server analyzes and processes the signals.
The communication unit signals are transmitted through 4G wireless communication.
As shown in fig. 3, the background server receives the processed discharge signal collected by the discharge signal collection unit, calculates amplitude information and discharge frequency (corresponding discharge frequency) statistical information corresponding to the discharge signal, obtains power frequency phase information according to the power frequency voltage signal collected by the power frequency voltage collection unit, calculates amplitude, frequency and power frequency phase information within a period of time (hour, day or month), and draws the amplitude, frequency and power frequency phase information into a chart, and can implement hierarchical early warning according to the change trend of the amplitude and frequency in the chart.
As shown in fig. 4 and 5, it is assumed that the time between the start time and the end time is a statistical and interesting time segment from the start time (replaced by T0, corresponding to the earliest discharge time in the risk, to the nearest min) to the end time (replaced by TN, corresponding to the latest discharge time in the risk, to min as well). If a total of N discharges occurred. Firstly, the time period from T0 to TN is divided into a plurality of equal time segments, for the convenience of statistics and drawing, the time segment number is set to be 10, and the time segments are respectively named as 'time segment 1', 'time segment 2', … … 'time segment 10'; during calculation, the discharge is classified into divided time intervals according to time, and then the amplitude and the frequency are respectively counted and calculated.
The discharge frequency and the discharge amplitude are increased by 50 percent compared with the reference discharge frequency and discharge amplitude, and the risk of class I is high; continuously counting the next time period after the level I risk is reached, if the level I risk is continuously increased by 100%, the level II risk is continuously increased, otherwise, the level I risk is stopped, and the reference is unchanged; the level II risk is increased by 100 percent, and the level III risk needs early warning.
The multi-circuit processing method and the multi-circuit processing device have the advantages that the discharging signals are processed through the multi-circuit processing, the peak value of the discharging signals is kept, the peak value is processed, the discharging signals can be collected at a low sampling rate (dozens of khZ to hundreds of kHz), and the power consumption of a hardware circuit is greatly reduced.
The ultrahigh frequency monitoring sensor is arranged in the cable joint, so that the high-sensitivity detection of partial discharge signals can be ensured.
Meanwhile, each monitoring device can independently send sampling signals to the background server to process data, and the accuracy of the data is guaranteed.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (6)
1. The utility model provides a join in marriage online monitoring device of net elbow type cable joint state, its characterized in that, including superfrequency monitoring sensor, power frequency voltage sensor, discharge signal acquisition unit, power frequency voltage acquisition unit, get electric unit and communication unit, superfrequency monitoring sensor is connected to filter circuit, and filter circuit is connected to signal amplification circuit, and signal amplification circuit is connected to peak hold circuit, and peak hold circuit is connected to discharge signal acquisition unit, and power frequency voltage sensor is connected to power frequency voltage acquisition unit, and the signal output part of power frequency voltage acquisition unit and discharge signal acquisition unit is connected to communication unit, and communication unit sends data to the backstage through wireless network, it gathers the electric energy through induction cable power frequency current mode to get electric unit, superfrequency monitoring sensor, power frequency voltage sensor, discharge signal acquisition unit, The power frequency voltage acquisition unit and the communication unit are both installed in an end cover of the cable joint.
2. The monitoring device of claim 1, wherein the power taking unit comprises a current induction power taking coil, a power module and a power taking connector, the current induction power taking coil is connected with the power module, the output voltage of the power module is input into the power taking connector, and the power taking connector is connected to the monitoring device.
3. The monitoring device according to claim 1, wherein the communication unit employs wireless communication in a 4G or NB-IOT manner.
4. The monitoring device of claim 1, wherein the signals collected by the power frequency voltage collecting unit and the discharge signal collecting unit are wirelessly transmitted to a background server through a communication unit.
5. The monitoring device of claim 1, wherein the uhf monitoring sensor is an uhf PCB antenna and the power frequency voltage acquisition unit is a voltage sensing plate.
6. The monitoring device of claim 1, wherein the ultrahigh frequency monitoring sensor, the power frequency voltage acquisition unit, the discharge signal acquisition unit and the communication unit are of an integrated structure and are attached to the inner side of a cable joint end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021286784.6U CN212622889U (en) | 2020-07-03 | 2020-07-03 | Join in marriage on-line monitoring device of net elbow type cable joint state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021286784.6U CN212622889U (en) | 2020-07-03 | 2020-07-03 | Join in marriage on-line monitoring device of net elbow type cable joint state |
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| CN212622889U true CN212622889U (en) | 2021-02-26 |
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| CN202021286784.6U Active CN212622889U (en) | 2020-07-03 | 2020-07-03 | Join in marriage on-line monitoring device of net elbow type cable joint state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671325A (en) * | 2021-08-18 | 2021-11-19 | 云南电网有限责任公司大理供电局 | Terminal partial discharge monitoring method and system based on high-frequency electric field change |
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2020
- 2020-07-03 CN CN202021286784.6U patent/CN212622889U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671325A (en) * | 2021-08-18 | 2021-11-19 | 云南电网有限责任公司大理供电局 | Terminal partial discharge monitoring method and system based on high-frequency electric field change |
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