CN219715712U - Three-phase cable line intermediate head state monitoring device - Google Patents
Three-phase cable line intermediate head state monitoring device Download PDFInfo
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Abstract
The utility model relates to a three-phase cable line intermediate head state monitoring device, comprising: the data acquisition units are arranged at the middle joint of at least one of the three-phase cable lines and are used for detecting and acquiring partial discharge signals and/or temperature signals at the middle joint installation position of the three-phase cable lines; the main control unit is connected with the one or more data acquisition units and used for acquiring partial discharge signals and/or temperature signals acquired by the one or more data acquisition units; and the equipment power supply unit is connected with the main control unit and one or more data acquisition units through the main control unit and is used for supplying power to the main control unit and the data acquisition units. According to the scheme of the utility model, the problem of high difficulty in detecting the operation and maintenance of the cable line at present is solved.
Description
Technical Field
The utility model relates to the technical field of cable line detection. More particularly, the utility model relates to a three-phase cable line intermediate joint condition monitoring device.
Background
Cabling has become an important component of modern urban power networks. At present, the cabling rate of large and ultra-large urban power grids in China is approximately 100%, and the cabling rate of medium-sized cities reaches a higher level of 60% -80%. Compared with other power supply equipment, the cable line has the characteristics of wide space coverage, complex and changeable engineering installation conditions, bad running and installation and laying environments and the like. Therefore, the reliable operation of the cable line is ensured, the operation and maintenance efficiency is improved, the technical problems are more, and the engineering significance is also greater.
The reduction of the insulation performance is the most important factor influencing the reliability of the cable line at present, and the factors such as poor construction process, mechanical stress damage, water immersion wetness, environmental corrosion and the like are the main reasons for causing the performance reduction or failure of the cable insulation system. In particular, existing cables are typically installed in cable wells, limited by environmental constraints within the cable wells, and the difficulty in detecting cable performance is significant.
Therefore, how to solve the problem of high difficulty in operation and maintenance detection of the cable line at present has important significance in promoting reliable operation of the cable line and improving operation, maintenance and repair efficiency.
Disclosure of Invention
In order to solve one or more of the above technical problems, the present utility model proposes to provide a data acquisition unit at an intermediate joint in a three-phase cable line to detect a fault at the intermediate joint that is prone to failure, thereby ensuring the operational reliability of the cable line.
To this end, the utility model provides a three-phase cable line intermediate head state monitoring device, comprising: the data acquisition units are arranged at the middle joint of at least one of the three-phase cable lines and are used for detecting and acquiring partial discharge signals and/or temperature signals at the middle joint installation position of the three-phase cable lines; the main control unit is connected with the one or more data acquisition units and used for acquiring partial discharge signals and/or temperature signals acquired by the one or more data acquisition units; and the equipment power supply unit is connected with the main control unit and one or more data acquisition units through the main control unit and is used for supplying power to the main control unit and the data acquisition units.
In one embodiment, the system further comprises an environment monitoring unit, wherein the environment monitoring unit is arranged in a cable well provided with the three-phase cable line and connected with the main control unit and used for monitoring one or more of temperature, humidity, water level in the well, gas concentration and opening and closing conditions of a well lid of the environment in the cable well.
In one embodiment, the main control unit is further in communication with a remote control platform in a wireless or wired manner, and is configured to send the acquired signals acquired by the one or more data acquisition units and the signals acquired by the environmental monitoring unit to the remote control platform.
In one embodiment, the power supply system further comprises a dynamic energy supplementing unit, wherein the dynamic energy supplementing unit is connected with the power supply unit of the equipment and is used for providing working power supply when the power taking condition is lacking.
In one embodiment, the data acquisition unit comprises a partial discharge sensor comprising a metal plate for detecting a high frequency pulse current flowing through a cable metal shield or a metal sheath in the three-phase cable line, and a joint temperature sensor for detecting temperature information at a joint in the three-phase cable line.
In one embodiment, the partial discharge sensor is disposed in a casing, the bottom of the casing is of an inward concave arc structure, the metal polar plate is of an arc-shaped metal polar plate, and is adapted to the contact portion of the three-phase cable, and the metal polar plate, the arc structure of the bottom of the casing, the insulating outer sheath of the three-phase cable and the metal sheath or the shielding layer form a coaxial capacitor.
In one embodiment, a metal heat conducting block is embedded in the middle of the outer part of the arc-shaped structure, and the joint temperature sensor is embedded in the metal heat conducting block and encapsulated by epoxy resin, so that the thermal coupling effect between the joint temperature sensor and the middle joint of the three-phase cable is ensured.
In one embodiment, the data acquisition unit further comprises a signal conditioning circuit and a central processing unit, wherein the signal conditioning circuit is connected with the partial discharge sensor and the joint temperature sensor and used for conditioning the acquired high pulse current and temperature information, and the central processing unit is connected with the signal conditioning circuit and used for recording and storing the conditioned high pulse current and temperature information.
In one embodiment, the data acquisition unit further comprises a communication interface circuit, and the communication interface circuit is connected with the central processing unit and used for uploading information recorded and stored in the central processing unit to an external device.
In one embodiment, the data acquisition unit further comprises a power conversion circuit, and the power conversion circuit is used for being connected with the main control unit and the central processing unit to supply power.
According to the scheme of the utility model, the detection of the partial discharge condition and/or the temperature condition in the cable line can be realized by collecting the partial discharge signal and/or the temperature signal at the installation position of the middle joint of the three-phase cable line, so that whether the fault tripping occurs in the operation process of the cable line and whether the fault occurs in the switching-on power transmission process is determined, the effective detection of faults such as insulation defects in the cable line is realized, and the pertinence and the working efficiency of the operation, maintenance and overhaul of the cable line are enhanced. Further, still through setting up the arc structure of the casing that the partial discharge sensor is located and connect the setting of temperature sensor in arc structure department in this scheme, fully with three-phase cable line looks adaptation, saved installation space and have good detection effect.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic diagram schematically illustrating a three-phase cabling intermediate joint condition monitoring device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram schematically illustrating other components of a condition monitoring apparatus according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram schematically illustrating components of a data acquisition unit according to an embodiment of the present utility model;
fig. 4 is a schematic view schematically showing a housing in which a data acquisition unit according to an embodiment of the present utility model is located;
fig. 5 is a schematic diagram schematically illustrating the principle of partial discharge sensor detection according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The reduction of the insulation performance is the most important factor affecting the reliability of the cable line, and the factors such as poor construction process, mechanical stress damage, water immersion wetness, environmental corrosion and the like are the main reasons for causing the performance reduction or failure of the cable insulation system. Statistics indicate that cable intermediate joint and termination faults can account for 85.5% of the total number of cable line faults. Thus, the inventors have analyzed that in order to increase the operational reliability of a cable line, the primary improvement objective should be focused on the intermediate connector and termination header portions of the cable line, rather than the relatively large portion of the cable body that is occupied by the line mileage. Statistics also indicate that faults during the operation of the cabling trip and switch-on power transmission occur in about 85% of the total faults of the cabling, while faults during the preventive test occur in only 12%.
In view of the above, the inventor finds that the partial discharge monitoring device is deployed at the middle joint part (mainly a cable well) and the terminal head part (mainly comprising a ring main unit and an overhead-cable hybrid line connection part) of the cable line, so that the insulation defect of the cable line can be effectively found, the pertinence and the working efficiency of the operation, maintenance and overhaul of the cable line are enhanced, and the power supply reliability of the cable line is remarkably improved.
Considering that most of the cable lines are three-phase cable lines and the laying modes such as pipe penetrating and buried are widely adopted, the middle joint part of the medium-voltage cable line is often placed in a special cable well, the main type is a cold-shrink middle joint, and the metal shielding layer or the metal sheath of the cable line is often closed inside the insulating sheath by a cold-shrink accessory and cannot be accessed.
Based on this, the electromagnetic wave method is selected as the principle of detecting partial discharge in the embodiment of the present utility model. Meanwhile, the integrated contact type temperature sensor is used for monitoring the temperature and the conductivity of the cable intermediate head, and the integrated monitoring of the cable operation environment conditions is realized by integrating multiple types of sensors (temperature and humidity, harmful gas, water level and cable well cover).
Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram schematically illustrating a three-phase cabling intermediate joint state monitoring device according to an embodiment of the present utility model.
As shown in fig. 1, the device for monitoring the status of the intermediate joint of the three-phase cable line in the scheme comprises one or more data acquisition units, a main control unit and a device power supply unit.
The one or more data acquisition units (Data Acquisition Unit, DAU) may be disposed at least one intermediate joint in the three-phase cable line for detecting and acquiring partial discharge signals and/or temperature signals at the intermediate joint installation site of the three-phase cable line. In some embodiments, the operation of the cabling may be determined by detecting a discharge condition in the cabling with a partial discharge sensor. The method suitable for detecting the partial discharge of the cable line is many, such as a high-frequency current method, a coupling capacitance method, a difference method, a direction coupling method, an ultrasonic method, an electromagnetic wave method and the like. However, these detection principles have strict technical requirements on the engineering laying conditions of the cabling and the type of intermediate connector, and are not universally applicable to medium voltage cabling. Therefore, in the case of medium voltage cabling, it is possible to select a suitable partial discharge detection principle and to determine the structural type and functional configuration of the detection device in combination with the specific engineering technical conditions of the medium voltage cabling.
The main control unit (Central Control Unit, abbreviated as CCU) may be connected to one or more data acquisition units for acquiring partial discharge signals and/or temperature signals acquired by the one or more data acquisition units. In some embodiments, the data acquisition unit utilizes built-in sensors (e.g., partial discharge sensors and splice temperature sensors, etc.) and signal processing circuitry to acquire partial discharge and temperature signals at the cable intermediate splice installation and to gather the digitally converted results to the master control unit via the fieldbus. Meanwhile, the main control unit provides a working power supply and receives and executes the control instruction sent by the main control unit. The data acquisition units can be configured into one path or multiple paths according to the number of intermediate connectors in the same cable well.
In an application scenario, for an application occasion that a plurality of cable intermediate connectors and data acquisition units exist in the same cable well, the main control unit can respectively control the work and dormancy of the data acquisition units in a polling mode, so that the power supply requirement and the energy consumption of the whole device are reduced to the greatest extent.
Further, the main control unit can also transmit the monitored data to a remote control platform in a wireless or wired mode.
A device power unit (Power supply unit, PSU for short) may be connected to and through the master unit with one or more data acquisition units for powering the master unit and the data acquisition units. In some embodiments, the device power unit may be a high capacity rechargeable battery unit to provide operating power to the overall condition monitoring apparatus in the absence of a power take-off condition within the cable pit.
The whole set of device in the utility model can also reduce the design complexity and manufacturing cost of the data acquisition unit and improve the flexibility of later operation and maintenance by adopting a split type centralized power supply processing mode of the main control unit and the equipment power supply unit.
The solution of the present utility model is briefly described above in connection with fig. 1, and will be further described in connection with specific components.
Fig. 2 is a schematic diagram schematically illustrating other components of a condition monitoring apparatus according to an embodiment of the present utility model.
As shown in fig. 2, the state monitoring device in the present utility model further includes an environment monitoring unit. The environment monitoring unit can be arranged in a cable well for installing a three-phase cable line and is connected with the main control unit and used for monitoring one or more of the temperature, the humidity, the water level, the gas concentration and the opening and closing conditions of a well lid of the environment in the cable well. Furthermore, the environment monitoring unit can monitor environment parameters with higher attention, such as environment temperature and humidity, in-well water level, harmful gas such as methane, and opening and closing of a cable well cover according to actual operation and maintenance requirements of power supply enterprises, and can reduce the design and manufacturing cost of the state monitoring equipment on the premise of meeting engineering requirements.
In some embodiments, the above-mentioned main control unit may also communicate with the remote control platform in a wireless or wired manner, and is configured to send the acquired signals acquired by the one or more data acquisition units and the signals acquired by the environmental monitoring unit to the remote control platform.
In an application scenario, the main control unit controls or switches the working state of the whole set of state monitoring device according to a preset scheme, so that the rotation control and state data aggregation of the data acquisition unit and the environment monitoring unit in the same cable well are realized, and the monitoring data are transmitted to a remote control platform deployed in a remote place in a proper communication mode (wireless or wired).
Further, the state monitoring device further comprises a dynamic energy supplementing unit. The dynamic energy supplementing unit is connected with the equipment power supply unit and is used for providing a working power supply when the power taking condition is lacking. Based on the above, the dynamic energy supplementing unit can select a photovoltaic panel, a wind driven generator, a space electromagnetic energy taking device, a voltage transformer/transformer and the like to dynamically supplement electric energy for the equipment power supply unit in the state monitoring device according to the installation conditions of the engineering site, so that the continuous working time of the equipment power supply unit is prolonged.
The data acquisition unit, the main control unit, the equipment power supply unit, the optional environment monitoring unit and the dynamic energy supplementing unit can be powered by adopting waterproof connectors of the same model and connected in a communication manner so as to adapt to severe engineering conditions (moisture, water immersion and dust) of a cable well.
Fig. 3 is a schematic diagram schematically illustrating components of a data acquisition unit according to an embodiment of the utility model.
As shown in fig. 3, the data acquisition unit may include a partial discharge sensor and a junction temperature sensor. The partial discharge sensor comprises a metal polar plate and is used for detecting high-frequency pulse current flowing through a cable metal shielding layer or a metal sheath in the three-phase cable circuit. The joint temperature sensor is used for detecting temperature information of joints in the three-phase cable line.
The data acquisition unit may further comprise a signal conditioning circuit and a central processing unit. The signal conditioning circuit is connected with the partial discharge sensor and the joint temperature sensor and is used for conditioning the acquired high pulse current and temperature information. The central processing unit is connected with the signal conditioning circuit and used for recording and storing the conditioned high pulse current and temperature information.
The central processing unit can utilize the built-in analog-to-digital converter to perform signal conversion, acquisition and filtering on the output of the signal conditioning circuit, and extract typical characteristic parameters (probability intensity, average intensity, discharge frequency and background noise) capable of representing the characteristics of partial discharge. Meanwhile, PRPD map data of the partial discharge activity can be acquired based on an internal synchronization mode and is combined with typical characteristic parameters and then sent to a main control unit, so that accuracy of diagnostic analysis and state evaluation of the partial discharge activity is improved. It will be appreciated that the algorithm program in the cpu may be selected according to actual needs, and the present utility model relates only to the hardware module of the cpu, and the software program is not limited thereto.
The signal processing circuit (Single Circuit Management, SCM for short) can adopt a logarithmic amplifier and a peak detection processing circuit, so that the gain of a signal amplification link can be adaptively adjusted according to the amplitude level of a detection signal, and meanwhile, the requirement on the performance of a subsequent data acquisition unit can be reduced on the premise of basically retaining the amplitude and phase information of the detection signal, so that the hardware cost of the data acquisition unit is reduced.
Further, the data acquisition unit further comprises a communication interface circuit. The communication interface circuit is connected with the central processing unit and is used for uploading information recorded and stored in the central processing unit to the external equipment. In some embodiments, the communication interface circuitry may include one or more forms of communication interfaces such as bluetooth, infrared, WIFI, and the like.
In some embodiments, the data acquisition unit further includes a power conversion circuit, where the power conversion circuit is connected to the main control unit and the central processing unit to supply power. For example, the power conversion circuit can be connected to the device power supply unit, so that the power supply process of the data acquisition unit is realized. In one application scenario, the input/output of the communication interface circuit and the power conversion circuit may be combined into the same waterproof multi-core connector, and then power and communication connection are implemented with the main control unit. The processing mode can reduce the complexity of field wiring on one hand and can obviously improve the reliability of field data communication on the other hand.
Fig. 4 is a schematic diagram schematically illustrating a housing in which a data acquisition unit according to an embodiment of the present utility model is located. Fig. 5 is a schematic diagram schematically illustrating the principle of partial discharge sensor detection according to an embodiment of the present utility model.
As shown in fig. 4, the data acquisition unit of the present utility model can be realized by the housing structure, which can be an insulating plastic housing and is completely closed at the outside. Specifically, the partial discharge sensor is disposed within the housing. The bottom of the shell is of an inward concave arc structure. The metal polar plate is a circular arc-shaped part metal polar plate and is matched with the contact part of the three-phase cable. The coaxial capacitor is formed by the arc structure of the metal polar plate and the bottom of the shell, the insulating outer sheath of the three-phase cable and the metal sheath or shield.
The partial discharge sensor belongs to an arc-shaped metal polar plate, and forms a coaxial capacitor with the lower arc-shaped shell, the cable insulation outer sheath and the metal sheath or the shielding layer, and the partial discharge sensor can be a metal electrode of the coaxial capacitor. When the high-frequency pulse current flows through the cable metal shielding layer or the metal sheath at the installation position of the state monitoring device, the high-frequency current is coupled out on the partial discharge sensor and captured by the acquisition device. The contact parts of the partial discharge sensor and the installation shell and the monitored cable line are designed to be arc-shaped, so that the electromagnetic relationship tight coupling between the appearance shapes of the sensor and the cable line is realized, and the dispersion of the electrical parameters of the partial discharge sensor possibly caused by the engineering installation process is eliminated as much as possible. Further, the partial discharge sensor can employ differential double-ended wiring to reduce the impact of background electromagnetic wave noise interference on signal capture and processing.
In some embodiments, a metal heat conducting block is embedded in the middle of the outer part of the arc-shaped structure, and the joint temperature sensor is embedded in the metal heat conducting block and encapsulated by epoxy resin, so that the thermal coupling effect between the joint temperature sensor and the middle joint of the three-phase cable is ensured. Specifically, the middle part of the arc-shaped part of the outer shell of the state monitoring device is embedded with a metal heat conduction block, and an epoxy plastic resin encapsulation sealing measure is implemented, and the joint temperature sensor is embedded into the metal heat conduction block and integrally encapsulated together, so that the waterproof performance of the data acquisition device is improved on the premise of ensuring a good thermal coupling relation between the data acquisition unit and the cable intermediate joint.
As shown in fig. 4, the partial discharge sensor in the present utility model may employ an electromagnetic wave coupling sensor. When a partial discharge phenomenon occurs in a cable line, rapid electron transfer from a high-voltage live conductor (cable core) to a low-voltage metal conductor (metal shield or armor) occurs, and a high-frequency discharge current propagating to both ends is formed in the low-voltage metal conductor. When the high-frequency pulse current propagates to the installation place of the partial discharge sensor, the associated high-frequency electromagnetic wave signal can be captured by the advanced close-fitting electromagnetic wave coupling sensor. Because the high-frequency discharge current and the electromagnetic wave signals associated with the high-frequency discharge current are covered along the whole course of the power cable line, the aim of partial discharge monitoring can be realized by only attaching the electromagnetic wave coupling sensor to the cable body.
Furthermore, the joint temperature sensor can utilize a built-in contact temperature sensor and an environment sensor (temperature, humidity and gas), and can realize synchronous monitoring of the overheating phenomenon of the cable intermediate joint (terminal head) and the environment parameters in the cable well.
While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and to cover such modular compositions, equivalents, or alternatives falling within the scope of the claims.
Claims (10)
1. A three-phase cable line intermediate head state monitoring device, comprising:
the data acquisition units are arranged at the middle joint of at least one of the three-phase cable lines and are used for detecting and acquiring partial discharge signals and/or temperature signals at the middle joint installation position of the three-phase cable lines;
the main control unit is connected with the one or more data acquisition units and used for acquiring partial discharge signals and/or temperature signals acquired by the one or more data acquisition units;
and the equipment power supply unit is connected with the main control unit and one or more data acquisition units through the main control unit and is used for supplying power to the main control unit and the data acquisition units.
2. The three-phase cable course intermediate head state monitoring device according to claim 1, further comprising an environment monitoring unit disposed in a cable well where the three-phase cable course is installed, and connected to the main control unit, for monitoring one or more of temperature, humidity, water level in the well, gas concentration, and opening and closing conditions of a well lid of the cable well environment.
3. The device for monitoring the status of an intermediate joint of a three-phase cable line according to claim 1, wherein the main control unit is further in communication with a remote control platform in a wireless or wired manner, and is configured to send the acquired signals acquired by the one or more data acquisition units and the signals acquired by the environmental monitoring unit to the remote control platform.
4. The three-phase cable line intermediate joint state monitoring device of claim 1, further comprising a dynamic energy replenishment unit connected to the device power supply unit for providing operating power in the absence of a power extraction condition.
5. The device for monitoring the state of an intermediate joint of a three-phase cable line according to claim 1, wherein the data acquisition unit comprises a partial discharge sensor and a joint temperature sensor, the partial discharge sensor comprises a metal polar plate and is used for detecting high-frequency pulse current flowing through a cable metal shielding layer or a metal sheath in the three-phase cable line, and the joint temperature sensor is used for detecting temperature information at a joint in the three-phase cable line.
6. The device for monitoring the state of an intermediate joint of a three-phase cable line according to claim 5, wherein the partial discharge sensor is arranged in a housing, the bottom of the housing is of an inward concave arc-shaped structure, the metal polar plate is of an arc-shaped metal polar plate and is matched with the contact part of the three-phase cable, and the metal polar plate, the arc-shaped structure at the bottom of the housing, the insulating outer sheath of the three-phase cable and the metal sheath or the shielding layer form a coaxial capacitor.
7. The device for monitoring the state of an intermediate joint of a three-phase cable line according to claim 6, wherein a metal heat conducting block is embedded in the middle of the outer part of the arc-shaped structure, and a joint temperature sensor is embedded in the metal heat conducting block and encapsulated by epoxy resin, so as to ensure the thermal coupling effect between the joint temperature sensor and the intermediate joint of the three-phase cable.
8. The three-phase cable line intermediate joint state monitoring device according to claim 5, wherein the data acquisition unit further comprises a signal conditioning circuit and a central processing unit, the signal conditioning circuit is connected with the partial discharge sensor and the joint temperature sensor and used for conditioning the acquired high pulse current and temperature information, and the central processing unit is connected with the signal conditioning circuit and used for recording and storing the conditioned high pulse current and temperature information.
9. The three-phase cable line intermediate joint state monitoring device of claim 8, wherein the data acquisition unit further comprises a communication interface circuit, the communication interface circuit being connected to the central processor for uploading information recorded and stored in the central processor to an external device.
10. The three-phase cable line intermediate joint state monitoring device of claim 8, wherein the data acquisition unit further comprises a power conversion circuit for connecting with a main control unit and the central processing unit for power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320629579.2U CN219715712U (en) | 2023-03-27 | 2023-03-27 | Three-phase cable line intermediate head state monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320629579.2U CN219715712U (en) | 2023-03-27 | 2023-03-27 | Three-phase cable line intermediate head state monitoring device |
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| CN219715712U true CN219715712U (en) | 2023-09-19 |
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| CN202320629579.2U Active CN219715712U (en) | 2023-03-27 | 2023-03-27 | Three-phase cable line intermediate head state monitoring device |
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