CN219715710U - High-voltage cable sheath grounding current on-line monitoring device - Google Patents
High-voltage cable sheath grounding current on-line monitoring device Download PDFInfo
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Abstract
The utility model discloses a high-voltage cable sheath grounding current on-line monitoring device in the technical field of high-voltage cables, which comprises: the device comprises an outer case, wherein a processing module and a communication module are arranged in an inner cavity of the outer case, the communication module is electrically connected with the processing module, and the communication module is a 5G communication module; the temperature vibration sensor interface, this kind of high tension cable sheath earth current on-line monitoring device gathers main cable current signal, earth connection current signal, cable high frequency partial discharge signal and cable joint and epidermis temperature vibration signal respectively through main cable current measurement transformer, earth connection current measurement transformer, high frequency current sensor and temperature vibration sensor to upload through communication module, utilize 5G network to realize current data automatic acquisition. When the cable breaks down, the platform can respond quickly and give an alarm, replaces manual on-site inspection, and realizes unmanned and intelligent inspection.
Description
Technical Field
The utility model relates to the technical field of high-voltage cables, in particular to an online monitoring device for grounding current of a high-voltage cable sheath.
Background
The task of on-line monitoring and diagnosis of power cables is to understand the insulation state of the cable, including the adoption of various detection, measurement, monitoring, analysis and discrimination methods. And (3) in combination with the history and the current situation of the system, the cable insulation state is evaluated by considering environmental factors, and whether the cable insulation state is in a normal or abnormal state is judged. And the state is displayed and recorded, and an alarm is given to the abnormal state so that operators can process the abnormal state in time. And simultaneously, information and basic data are provided for insulation assessment, reasonable use and safe operation of the equipment.
With the high-speed development of power grid construction, the power cable is used more and more widely, and the requirements for performance monitoring and historical data collection of new cables are more and more increased. Meanwhile, the cable laid earlier is now continued for a normal service life, and insulation problems of the cable will be increased increasingly.
Long-term practice has shown that partial discharge is the main cause of dielectric breakdown of power cables. Firstly, in the partial discharge process, ionized electrons and positive and negative ions have large energy under the action of electric field force, and when the electrons and the positive and negative ions collide with an air-washed insulating wall in the insulation, chemical bonds of the insulating material macromolecule are broken to generate cracking. Secondly, the medium heats up to very high temperatures at the discharge point, and the insulating material is burnt or melted at the discharge point. The temperature rise may also produce thermal cracking or promote oxidative cracking. While an increase in temperature increases the conductance and loss of the medium, thereby creating a deterioration cycle, resulting in dielectric breakdown. Third, many active products are generated during partial discharge, and these products corrode the insulator, so that the dielectric properties are deteriorated. Fourth, partial discharge is likely to generate X-rays and Y-rays, which have high energy and promote polymer cracking. In addition, the insulator is microcracked by the continuous explosive discharge and the high-pressure gas generated by the discharge, so that electric branches are generated. The existing high-voltage cable monitoring mode is used for determining the integrity of the high-voltage cable through manual field inspection, but the manual inspection mode is low in efficiency, and when the cable fails, the cable cannot be maintained timely.
Disclosure of Invention
The utility model aims to provide a high-voltage cable sheath grounding current on-line monitoring device, which aims to solve the problems that the existing high-voltage cable monitoring mode proposed in the background art is mainly to determine the integrity of a high-voltage cable through a manual field inspection mode, but the manual inspection mode is low in efficiency, and the cable cannot be maintained timely when the cable fails.
In order to achieve the above purpose, the present utility model provides the following technical solutions: an on-line monitoring device for high-voltage cable sheath grounding current, comprising:
the device comprises an outer case, wherein a processing module and a communication module are arranged in an inner cavity of the outer case, the communication module is electrically connected with the processing module, and the communication module is a G communication module;
the temperature vibration sensor interface is arranged on the end face of the outer chassis and is electrically connected with the processing module;
the communication port is arranged on the end face of the outer chassis and on the side face of the temperature vibration sensor interface, and is electrically connected with the processing module;
the grounding current sensor interface is arranged on the end face of the outer chassis and on the side face of the communication port, and is electrically connected with the processing module;
the high-frequency current sensor interface is arranged on the end face of the outer chassis and on the side face of the grounding current sensor interface, and the high-frequency current sensor interface is electrically connected with the processing module.
Preferably, the temperature vibration sensor further comprises an induction electricity-taking current sensor interface, wherein the induction electricity-taking current sensor interface is arranged on the end face of the outer case, and the induction electricity-taking current sensor interface is arranged on one side, far away from the communication port, of the temperature vibration sensor interface.
Preferably, the device further comprises an induction electricity-taking current transformer, and the induction electricity-taking current transformer is electrically connected with the induction electricity-taking current sensor interface.
Preferably, the device further comprises a main cable current measurement transformer, wherein the main cable current measurement transformer is electrically connected with the high-frequency current sensor interface.
Preferably, the device further comprises a grounding wire current measurement transformer, and the grounding wire current measurement transformer is electrically connected with the grounding current sensor interface.
Preferably, the device further comprises a high-frequency current sensor, wherein the high-frequency current sensor is electrically connected with the communication port.
Preferably, the device further comprises a temperature vibration sensor, wherein the temperature vibration sensor is electrically connected with the temperature vibration sensor interface.
Preferably, the high-frequency current sensor further comprises an optical fiber interface, wherein the optical fiber interface is arranged on the end face of the outer chassis and on the side face of the high-frequency current sensor interface.
Compared with the prior art, the utility model has the beneficial effects that: this kind of high tension cable sheath earth current on-line monitoring device gathers main cable current signal, earth connection current signal, cable high frequency partial discharge signal and cable joint and epidermis temperature vibration signal respectively through main cable current measurement transformer, earth connection current measurement transformer, high frequency current sensor and temperature vibration sensor to upload through communication module, utilize 5G network to realize current data automatic acquisition. When the cable breaks down, the platform can respond quickly and give an alarm, replaces manual on-site inspection, and realizes unmanned and intelligent inspection.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a schematic block diagram of a system flow of the present utility model.
In the figure: 100 outer machine cases, 200 induction electricity-taking current sensor interfaces, 300 temperature vibration sensor interfaces, 400 high-frequency current sensor interfaces, 500 grounding current sensor interfaces, 600 high-frequency current sensor interfaces and 700 optical fiber interfaces.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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 utility model provides a high-voltage cable sheath grounding current on-line monitoring device, which is characterized in that a main cable current measuring transformer, a grounding wire current measuring transformer, a high-frequency current sensor and a temperature vibration sensor are used for respectively acquiring a main cable current signal, a grounding wire current signal, a cable high-frequency partial discharge signal, a cable connector and a skin temperature vibration signal, uploading the signals through a communication module and realizing automatic acquisition of current data by utilizing a 5G network. When the cable breaks down, the platform can respond fast and send out the alarm, replace manual on-site inspection, realize inspection unmanned and intelligent, please refer to fig. 1, include: the device comprises an outer case 100, an induction power-taking current sensor interface 200, a temperature vibration sensor interface 300, a communication port 400, a grounding current sensor interface 500, a high-frequency current sensor interface 600 and an optical fiber interface 700;
referring to fig. 1-2, a processing module and a communication module are installed in an inner cavity of the outer chassis 100, the communication module is electrically connected with the processing module, the communication module is a 5G communication module, the system mainly utilizes a payment network provided by a wireless operator (mobile, communication and telecommunication), a communication channel between cloud and a field acquisition unit is established through a network of the operator, the 5G communication network is mainly utilized, the 5G characteristic is highly matched with the performance of a smart grid, for online monitoring of cable grounding current, the acquisition data is faster in transmission speed, lower in network delay and higher in safety through the 5G network, more acquisition equipment networking can be realized by utilizing the characteristics of large bandwidth and high reliability of the 5G network, the data transmission efficiency is improved, the capacity of network expansion is improved, the current data automatic acquisition is realized by utilizing the 5G network, a platform can quickly respond and give an alarm when the cable fails, the unmanned and intelligent inspection is replaced by manual field inspection, the network networking cost can be reduced by utilizing the 5G network, the installation mode is flexible, and networking is simple and low in cost;
the induction electricity-taking current sensor interface 200 is arranged on the end face of the outer case 100, the induction electricity-taking current sensor interface 200 is arranged on one side, far away from the communication port 400, of the temperature vibration sensor interface 300, the induction electricity-taking current sensor interface 200 is further provided with an induction electricity-taking current transformer, the induction electricity-taking current transformer is electrically connected with the induction electricity-taking current sensor interface 200, the induction electricity-taking current sensor interface 200 is provided with two interfaces, namely CT1 and CT2, as shown in figure 1, a front end acquisition unit mainly comprises a double CT electricity-taking plug-in unit, a grounding current acquisition plug-in unit and a cable partial discharge acquisition plug-in unit, the double CT electricity-taking plug-in unit is used for rectifying, filtering, stabilizing and the energy acquired by the induction electricity-taking current transformer to acquire a stable voltage signal, and the double CT electricity-taking plug-in unit is led into an advanced super capacitor design, and the system can ensure 10 minutes of operation after power outage. The super capacitor is used for providing a backup power supply for the data acquisition unit, and the super capacitor is used for charging the super capacitor after the super capacitor senses the voltage signal acquired by the power acquisition current transformer and is rectified and stabilized. When the induction current cannot be obtained or the induction current cannot meet the requirement that the data acquisition unit works, the super capacitor discharges to provide electric energy for the data acquisition unit. The super capacitor has the characteristics of high charging speed, long service life, high-current discharge, green environmental protection and the like;
the temperature vibration sensor interfaces 300 are arranged on the end face of the outer case 100, the temperature vibration sensor interfaces 300 are electrically connected with the processing module, the temperature vibration sensor interface 300 further comprises temperature vibration sensors, the temperature vibration sensors are electrically connected with the temperature vibration sensor interfaces 300, the number of the temperature vibration sensor interfaces 300 is 4, namely an A-phase temperature vibration sensor interface Sa, a B-phase temperature vibration sensor interface Sb, a C-phase temperature vibration sensor interface Sc and an environment temperature sensor interface Se, and the temperature vibration sensor interfaces are mainly used for collecting cable joints and skin temperature vibration signals as shown in fig. 1;
the communication ports 400 are arranged on the end face of the outer case 100 and on the side face of the temperature vibration sensor interface 300, the communication ports 400 are electrically connected with the processing module, the communication device further comprises high-frequency current sensors, the high-frequency current sensors are electrically connected with the communication ports 400, the number of the communication ports 400 is 1, and the communication ports COM are shown in fig. 1;
the grounding current sensor interfaces 500 are arranged on the end face of the outer chassis 100 and on the side face of the communication port 400, the grounding current sensor interfaces 500 are electrically connected with the processing module, the grounding current sensor interfaces 500 further comprise grounding wire current measuring transformers, the grounding wire current measuring transformers are electrically connected with the grounding current sensor interfaces 500, the number of the grounding current sensor interfaces 500 is 4, namely an A-phase grounding current sensor interface Ia, a B-phase grounding current sensor interface Ib, a C-phase grounding current sensor interface Ic and a total grounding current sensor interface Ie, and as shown in fig. 1, the grounding current sensor interfaces are mainly responsible for collecting grounding wire current signals;
the high-frequency current sensor interfaces 600 are arranged on the end face of the outer case 100 and on the side face of the grounding current sensor interface 500, the high-frequency current sensor interfaces 600 are electrically connected with the processing module, the high-frequency current sensor interfaces 600 further comprise main cable current measuring transformers, the main cable current measuring transformers are electrically connected with the high-frequency current sensor interfaces 600, the number of the high-frequency current sensor interfaces 600 is 3, namely an A-phase high-frequency current sensor interface Pda, a B-phase high-frequency current sensor interface Pdb and a C-phase high-frequency current sensor interface Pdc, and as shown in fig. 1, the high-frequency current sensor interfaces 600 are mainly responsible for collecting main cable current signals;
the optical Fiber interface 700 is disposed on the end surface of the outer case 100 and on the side surface of the high-frequency current sensor interface 600, and the optical Fiber interface 700 is divided into an optical Fiber communication input interface Fiber IN and an optical Fiber communication output interface Fiber OUT, as shown IN fig. 1;
the grounding current acquisition plug-in completes the acquisition of the true effective value of the grounding current through measuring the signal of the current transformer, acquires the cable joint and the skin temperature vibration signal, transmits data to the background in a wireless or optical fiber mode, realizes the measurement of the cable partial discharge signal by the cable partial discharge acquisition plug-in, realizes the acquisition of the cable partial discharge signal, and the outer chassis 100 adopts the design mode of an outer waterproof chassis and an inner chassis, and introduces CT signals into the acquisition system through a waterproof plug. Wherein the circuit boards are all mounted in the inner chassis. The outer case is used for waterproof, waterproof joint installation and inner case installation. The waterproof grade of the shell is IP68, the inner chassis is a standard 4U half-width chassis, and a plug-in installation mode is adopted, so that a back plug-in board type structure is initiated, the waterproof grade is used for the first time in the industry, and the on-site debugging and maintenance are greatly facilitated. The dual-CT power taking plug-in unit, the grounding current collecting plug-in unit and the cable partial discharge collecting plug-in unit are included, random configuration of a hardware module is facilitated, an outer chassis is made of 304 stainless steel materials, an inner chassis is fixed on the outer chassis through a stud, and an aviation socket is installed on the outer chassis;
the current transformer completes the measurement of the grounding current and the main cable current. The maximum range of the grounding current transformer is 300A, the transformation ratio is 300:5, and the precision is 1%. The maximum measuring range of the main cable current sensor is 1000A, the measuring range is 1000:5, and the precision is 1%;
the cable partial discharge sensor adopts a broadband open type current sensor, can well inhibit noise, has small high-frequency loss, and can be safely and conveniently used. The nanocrystalline material is adopted, the response frequency range is 0.3-100MHz, the sensitivity is more than 5mV/mV, and the impedance is 50 ohms;
the temperature vibration sensor realizes the acquisition of cable joints and surface temperature vibration signals, wherein the temperature measurement range is-5-260 ℃ and the vibration range is 0-16 g, so that the functions of three-phase joint and skin temperature vibration measurement and environmental temperature measurement can be satisfied;
under the condition that a convenient power supply cannot be provided on site, the energy collection device can be used for collecting energy on a main cable and providing current required by operation for a collection unit. The maximum power taking capacity of the power taking CT reaches 7.5VA;
when in specific use
The installation site of the CT current sensor is preferably arranged outside the station and is arranged at a position where sheath circulation can be monitored;
only 1 CT current sensor is installed on each phase of the direct grounding end of the single-section circuit;
in a loop system, only one CT current sensor is installed per phase: in a circulation system formed by a cross-connection box and a direct connection box, CT is arranged in the cross-connection box; a loop system consisting of only directly connected ground boxes, wherein the CT is arranged on a ground cable outside the directly connected ground boxes;
the method comprises the steps that 1 middle joint surface layer temperature sensor is installed at each sheath circulation monitoring point, the installation position is a cable joint, one middle joint surface layer temperature sensor is installed at each phase, three temperature sensors are installed in the nearest cable pipe, one middle joint surface layer temperature sensor is installed at each phase, three temperature sensors are installed at each phase, and the sensors are used for dynamic current-carrying capacity monitoring and the other 1 environment temperature sensor; 7 temperature sensors are arranged at each position;
1 cable joint fault vibration degree sensor is installed at each sheath loop monitoring point, the installation position is the cable joint, one for each phase, and three fault vibration degree sensors are all arranged;
the HFCT current sensor is arranged at the grounding wire of the cable terminal or in the cross-connection box;
the wireless sheath current collection device is arranged in an underground 1.6-meter working well and is soaked in water for a long time, so that the device electric box is designed by adopting a wall-mounted shell structure, and the protection level is up to the IP68 standard;
under normal conditions, the cable metal sheath has a certain induced potential with the cable core, and the induced potential is particularly serious under the conditions of accidents and overvoltage or lightning strike overvoltage in the system. Therefore, the cable metal sheath must be properly grounded, with the earth being used to limit the cable metal sheath to an allowable ground potential. When the power cable above 66KV is mostly a single-core cable, if the two ends of the metal sheath are directly grounded after being three-phase interconnected during laying, when the wire core passes through the current, the induction voltage generated on the metal sheath causes induction circulation on the metal sheath due to electromagnetic induction of the conductor current. The system adopts the circulation method principle, namely, under the normal condition (namely, one point is grounded), the circulation on the metal sheath is extremely small and mainly is capacitive current, and once the metal sheath is grounded at multiple points and forms a loop with the earth, the circulation is obviously increased and can reach more than 90% of main current in severe cases.
At the same time partial discharge is also a major cause of damaging the insulation of the power cable. Under the action of partial discharge, the insulator of the power cable is cracked, and the generated high temperature can burn the discharge point of the cable and the like.
The system collects the effective values of the grounding current and the main cable current, simultaneously collects the power frequency waveform and the high-frequency partial discharge signal on the cable, the cable connector and the skin temperature vibration signal, publishes and subscribes the architecture based on the MQTT protocol, remotely publishes data to a server at a certain time interval in a 5G wireless communication mode, subscribes for a background collection program, stores the data in a database and displays the data by a client software page. The on-line monitoring of the multipoint grounding fault of the single-core cable metal sheath can be realized by monitoring the metal sheath circulation and the variation, the power frequency and partial discharge signal spectrum data and the temperature vibration signal of the metal sheath in real time.
The background collection program subscribes to the data, establishes a history data file, and draws the data into various curves. The cable operation maintenance personnel can know the long-term operation state of the whole cable according to the information provided by the curves.
And meanwhile, the background acquisition program processes the acquired current data and provides a cable current abnormality alarm and an equipment state alarm.
Although the utility model has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the features of the disclosed embodiments may be combined with each other in any manner so long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of brevity and resource saving. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. The utility model provides a high tension cable sheath earth current on-line monitoring device which characterized in that: comprising the following steps:
the device comprises an outer machine case (100), wherein a processing module and a communication module are arranged in an inner cavity of the outer machine case (100), the communication module is electrically connected with the processing module, and the communication module is a 5G communication module;
the temperature vibration sensor interface (300) is arranged on the end face of the outer chassis (100), and the temperature vibration sensor interface (300) is electrically connected with the processing module;
the communication port (400) is arranged on the end face of the outer case (100) and on the side face of the temperature vibration sensor interface (300), and the communication port (400) is electrically connected with the processing module;
the grounding current sensor interface (500), the grounding current sensor interface (500) is arranged on the end face of the outer chassis (100) and on the side face of the communication port (400), and the grounding current sensor interface (500) is electrically connected with the processing module;
the high-frequency current sensor interface (600), the high-frequency current sensor interface (600) is arranged on the end face of the outer chassis (100) and on the side face of the grounding current sensor interface (500), and the high-frequency current sensor interface (600) is electrically connected with the processing module.
2. The high voltage cable sheath grounding current on-line monitoring device according to claim 1, wherein: the intelligent temperature control system is characterized by further comprising an induction electricity-taking current sensor interface (200), wherein the induction electricity-taking current sensor interface (200) is arranged on the end face of the outer case (100), and the induction electricity-taking current sensor interface (200) is arranged on one side, far away from the communication port (400), of the temperature vibration sensor interface (300).
3. The high voltage cable sheath grounding current on-line monitoring device according to claim 2, wherein: the induction power-taking current transformer is electrically connected with the induction power-taking current sensor interface (200).
4. The high voltage cable sheath grounding current on-line monitoring device according to claim 3, wherein: the device further comprises a main cable current measurement transformer, wherein the main cable current measurement transformer is electrically connected with the high-frequency current sensor interface (600).
5. The device for on-line monitoring of grounding current of high voltage cable sheath of claim 4, wherein: the device further comprises a grounding wire current measurement transformer, and the grounding wire current measurement transformer is electrically connected with the grounding current sensor interface (500).
6. The device for on-line monitoring of grounding current of high voltage cable sheath of claim 5, wherein: the high-frequency current sensor is electrically connected with the communication port (400).
7. The device for on-line monitoring of grounding current of high voltage cable sheath of claim 6, wherein: the device also comprises a temperature vibration sensor, wherein the temperature vibration sensor is electrically connected with the temperature vibration sensor interface (300).
8. The high voltage cable sheath grounding current on-line monitoring device of claim 7, wherein: the high-frequency current sensor further comprises an optical fiber interface (700), wherein the optical fiber interface (700) is arranged on the end face of the outer chassis (100) and is arranged on the side face of the high-frequency current sensor interface (600).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117192271A (en) * | 2023-10-08 | 2023-12-08 | 广州羊城电气设备有限公司 | Wire slot cable on-line monitoring system |
| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
-
2023
- 2023-02-20 CN CN202320255347.5U patent/CN219715710U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117192271A (en) * | 2023-10-08 | 2023-12-08 | 广州羊城电气设备有限公司 | Wire slot cable on-line monitoring system |
| CN117686783A (en) * | 2023-12-12 | 2024-03-12 | 武汉朗德电气有限公司 | High-voltage cable grounding current on-line monitoring device based on load dynamic management |
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