CN110940895A - Cable joint explosion-proof fire-extinguishing and temperature, partial discharge comprehensive on-line monitoring device - Google Patents
Cable joint explosion-proof fire-extinguishing and temperature, partial discharge comprehensive on-line monitoring device Download PDFInfo
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- CN110940895A CN110940895A CN201911301105.XA CN201911301105A CN110940895A CN 110940895 A CN110940895 A CN 110940895A CN 201911301105 A CN201911301105 A CN 201911301105A CN 110940895 A CN110940895 A CN 110940895A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The application discloses cable joint explosion-proof fire extinguishing and temperature, office are put and are synthesized on-line monitoring device includes and closes the sealed parcel of cable joint who will wait to detect and fixed explosion-proof casing through last lower cover, explosion-proof casing outside can dismantle fixed mounting have the control unit as information processing center, the control unit electricity respectively is connected with level sensor, displacement sensor, temperature sensing unit and temperature control unit to and extinguishing device, the sensor is put in the office to and the monitoring information who gathers the control unit sends regularly to the surveillance center through the NB communication antenna of being connected with the control unit, and the built-in battery that is used for the power supply. The invention collects the information of the environment where the cable joint is located by the timer timing wake-up control unit and sends the information at a timing, and can greatly save the loss of the electric energy of the battery on the premise of monitoring the working condition of the cable joint, so that one lithium thionyl chloride battery can be normally used for about 5 years.
Description
Technical Field
The invention relates to the field of transmission line detection and protection devices or equipment, in particular to the field of transmission cable joint fault monitoring, and particularly relates to a cable joint explosion-proof fire extinguishing and temperature and partial discharge comprehensive online monitoring device.
Background
The traditional power grid is erected in the air to form a power transmission network by supporting power transmission lines through countless telegraph poles, but with the modern development of cities, the erected power grid in the air is not consistent with the current urban normative layout, and meanwhile, the power utilization safety is difficult to guarantee. In the existing cities, underground power transmission networks are basically adopted uniformly, however, the number of cables in underground passages is increased rapidly, which causes the operation failure of the cables to happen, particularly at the joint position between the cables. Research shows that the cable joint is the weakest link in the whole cable line, more than 90% of cable operation faults occur at the joint part between the cables, the cable joint is grounded or short-circuit electric arcs are likely to explode, or open fire is generated to ignite other combustibles in a channel while the cable joint is close to the cable to catch fire, so that fire hazard is greatly increased. Meanwhile, due to the structural particularity of the cable channel, once the cable channel is ignited, the cable channel can be rapidly transmitted in the channel, large-area power failure occurs, and huge economic loss is caused. Therefore, the omnibearing on-line monitoring of the running state of the cable joint has important significance for the safe running of the underground power grid.
In recent years, accidents of thermal breakdown of cables caused by loads exceeding the actual current carrying capacity of the cables during cable transportation occur many times at home and abroad, which proves the urgency and importance of carrying out online monitoring of cable temperature and partial discharge.
At present, the troubleshooting of cable faults is also a difficulty, the general acousto-optic-magnetic synchronous positioning method is used for searching the approximate position of a fault point, but the positioning is not accurate enough, and meanwhile, the cable fault is easily interfered by the surrounding environment, the fault is difficult to be cleared at the first time, and the further development of accidents is often caused. At present, passive fire prevention is generally used for cable channel fire prevention, and a method for coating fire-proof paint and placing a fire retardant bag in a stainless steel groove box and a glass fiber groove box is adopted, but the effect is limited, fault location alarm and fire extinguishment can not be carried out, the fire can be controlled in the section of cable within a certain time, adjacent cables are not affected, meanwhile, the fire-resistant time and the temperature of the device are limited, after the temperature exceeds 1000 ℃, the fire can be possibly transmitted to adjacent cables, the cable and the cable middle joint which are generated due to interphase short circuit at the current cable middle joint explode, and the explosion impact force and the high temperature which are generated instantly cause great damage.
In addition to the above, there are many related detection techniques for cable joints, and after the applicant reads the related techniques, it is concluded that:
1. the cable can form larger circulation current on the shielding layer, and can reach 50% -90% of the main current when the cable is serious, namely tens of amperes or even hundreds of amperes, the loss is very large, cable explosion can even occur, the safe operation of a power system is influenced, and the conventional cable head detection device is relatively deficient in the technology for evaluating the cable shielding layer.
2. The grounding cable and the grounding box have higher values, so that the theft of lawless persons is caused. Underground passage can not dispatch personnel at any time and patrol and examine, must increase the management degree of difficulty of electric power department like this, though some equipment can judge whether take place the action of stealing through monitoring earth cable, grounding box and monitoring facilities self vibrations and displacement condition now, and equipment is not necessarily because suffer to steal into just produces vibrations or displacement, and what probably had is because self vibration or monitoring devices trouble, consequently and the condition of taking place the false positive.
3. Along with urban inland inundation, corrosive liquids such as various acids, alkalis, salts and the like are poured into a cable channel to corrode a cable joint, and the cable joint is easy to break down or even explode due to the fact that the cable joint is mixed with water and gas in construction in humid weather. The traditional power cable explosion-proof box also has the problem of insufficient equipment intellectualization, cannot monitor the condition of harmful gas near the cable in real time, and cannot prevent and quickly position accidents.
Therefore, it is very important to ensure the safe operation of the power grid and improve the management efficiency of the power department, but the existing cable monitoring technology is not mature enough, the monitoring range is limited, a plurality of important data cannot be monitored together through one system, the monitoring data is incomplete, and the most real working condition of the cable operation cannot be reflected; the parameter analysis method is incomplete, the most real working condition of the cable operation cannot be reflected, and false alarm is possibly generated. Therefore, the cable joint explosion-proof fire extinguishing and on-line temperature and partial discharge monitoring device is urgently needed to solve the problems of safety protection monitoring, early warning and automatic fire extinguishing of the cable joint, realize the functions of explosion prevention, fire extinguishing, water level, temperature measurement, partial discharge, harmful gas, burglary prevention, fault location and the like of the cable joint, and has important significance for guaranteeing power supply and power safety production.
Disclosure of Invention
In order to solve the incomplete problem that exists in the aspect of explosion-proof, putting out a fire and partial discharge monitoring to cable joint among the prior art, the application provides a be used for cable joint explosion-proof fire-extinguishing and temperature, partial discharge to synthesize on-line monitoring device specially, adopt NB-iot communication mode to include information such as temperature, partial discharge with regularly gathering cable joint through built-in communication module, for timely maintenance to trouble cable joint provides the guarantee, also can in time get rid of the hidden danger simultaneously, the accident that prevention cable electric leakage, explosion lead to.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
the cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device comprises an explosion-proof shell which is used for hermetically wrapping and fixing a cable joint to be detected through an upper cover and a lower cover, a control unit which is used as an information processing center is detachably and fixedly arranged outside the explosion-proof shell, the control unit is respectively and electrically connected with a water level sensor which is arranged outside the explosion-proof shell and used for detecting the environmental water level of the cable joint, and a displacement sensor which is arranged at the head of a cable well and used for detecting the opening and closing of the well cover; and the temperature sensing unit is arranged in the explosion-proof shell and is tightly attached to the surface of the cable joint, the temperature sensing unit is used for detecting the temperature change, the temperature control unit works and is respectively connected with the control unit to be used for extinguishing and cooling the fire extinguishing device in the explosion-proof shell, the local discharge sensor used for detecting local discharge is sleeved on the circumference of the outer side of the cable joint, monitoring information collected by the control unit is sent to a monitoring center through an NB communication antenna connected with the control unit at regular time, and a battery used for supplying power is arranged in the monitoring center.
Working principle and function explanation:
the advantage of integrating above-mentioned on-line monitoring device on explosion-proof housing lies in can guaranteeing to install the leakproofness of the component in explosion-proof housing to and not influenced by external world, can provide better operational environment, avoid the environmental reason to lead to components and parts trouble. Because the existing cables are buried underground, the manpower cost investment for power grid maintenance can be greatly saved by reducing the overhaul caused by non-cable faults as much as possible. All the detection information is stored and calculated through the control unit, the control unit is a collection center and a processing center of all the information of the online monitoring device, and the control unit can match with a proper MCU according to specific models selected by the water level sensor, the partial discharge sensor and the temperature sensing unit. Indeed, although there are many types of sensors and control units that meet the monitoring requirements, the selection principle should be based on low energy consumption, because the fault monitoring of the cable joint generally requires a service life of several years for one-time installation, and therefore, the problem of energy consumption supply of the built-in battery needs to be considered, and the use of low-power components is beneficial to prolonging the service life. In order to further realize low energy consumption, a control logic in the control unit is realized through a timer, wherein the set time t is a sleep period of the control unit, the control unit is awakened once every time t, meanwhile, all sensors including a displacement sensor, a water level sensor and a temperature sensor forming a temperature sensing unit start working and collect corresponding displacement data, water level data and temperature data once and are stored in the control unit, and after the sensors are collected for n times, the controller sends all the data collected for-n times to a background monitoring center through an NB communication antenna, so that the background monitoring center can obtain the real-time state of the corresponding cable joint in n time periods t. Meanwhile, the control unit has the important function that the actual environmental condition is compared with the preset condition of the fire extinguishing device, when the preset condition is reached, the control unit sends a trigger electric signal to the fire extinguishing device to trigger the fire extinguishing device to extinguish the fire, and accidents such as explosion caused by the ignition of the cable joint are achieved.
Preferably, the control unit comprises a controller, and a communication module, a partial discharge module and a fire extinguishing module which are electrically connected with the controller, wherein the communication module is used for collecting monitoring information sent by the controller at regular time and sending the monitoring information through the NB communication antenna; the partial discharge module converts an analog signal acquired by the partial discharge sensor into a digital signal and sends the digital signal to the controller; the fire extinguishing module is used for sending the command sent by the controller and triggering the fire extinguishing device.
Preferably, the temperature control unit comprises a first temperature control switch, a second temperature control switch and a third temperature control switch which are conducted according to different temperatures and are respectively installed at two ends and the middle part of the cable joint; the controller works, the controller compares a preset threshold value with a temperature value corresponding to the closed temperature control switch through comparison, and when the actual temperature value exceeds the preset threshold value, the controller sends a starting instruction to the fire extinguishing module, and the fire extinguishing module starts the fire extinguishing device. Temperature detect switch adopts the thermal energy switch of physical structure, set for the temperature detect switch that different temperature values switched on according to actual cable joint operating conditions, because the cable joint outside has the armor, consequently if the cable joint is inside to take place unusually, the heat-conduction has the inhomogeneous condition that probably exists extremely, consequently, set for three temperature detect switch and can avoid leading to untimely controller work of starting out because of cable joint local fault generates heat at cable joint's both ends head and middle part, in time gather and send the monitoring center with the alarm information of gathering.
Preferably, the temperature sensing unit includes a first temperature sensor, a second temperature sensor and a third temperature sensor respectively installed at two ends and a middle portion of the cable connector. The purpose of providing a plurality of temperature sensors and the purpose of providing a plurality of temperature controlled switches have similar effects, one of which is that having an armor based on the cable joint surface will result in dissipation of heat, while also causing a reduction in the rate of heat transfer. Because the cable joint has certain length, generally more than thirty centimeters, the temperature of the heating point can not be timely detected by arranging a single temperature sensor. Both ends and the middle part of the cable joint are provided with temperature sensors, so that blind areas of temperature measurement can be effectively avoided, and the accuracy of temperature detection is improved.
Preferably, a vibration sensor for detecting the vibration of the cable joint and a gas detection sensor for detecting abnormal gas in the explosion-proof shell are further mounted on the inner side wall of the explosion-proof shell. The effect of gaseous detection sensor is that the unusual gas that produces in the detection explosion-proof housing, because temperature sensor installs at the cable joint armor outside, and under the condition of unusual serious electric leakage, there is the hysteresis in the temperature detection through the cable joint surface, but the outside plastics armor of cable joint that is heated can produce unusual gas, the unusual gas that produces according to the material difference of surface insulation armor has some differences, gaseous detection sensor's effect is exactly through whether there is unusual gas from another dimension monitoring cable joint be in normal condition.
Preferably, the battery comprises a lithium thionyl chloride battery and a super capacitor connected in parallel with the lithium thionyl chloride battery. The fire extinguishing device adopts a superfine dry powder fire extinguisher or an aerosol fire extinguisher. The existing small-sized superfine dry powder fire extinguisher or aerosol fire extinguisher has excellent fire extinguishing performance for a closed space and mature technology, and the lithium thionyl chloride battery can ensure longer power supply endurance so as to ensure the service life of the monitoring device under the condition of not replacing the battery; meanwhile, the super capacitor is connected in parallel to the lithium thionyl chloride battery, so that power guarantee can be provided when large power is needed for supplying in a short time, and unstable current and voltage output is avoided. If the fire extinguishing apparatus is at the moment of departure, the stability of the super capacitor and the lithium thionyl chloride battery which are connected in parallel is much higher than that of the single lithium thionyl chloride battery. Meanwhile, the parallel super capacitor can protect the lithium thionyl chloride battery, and the service life of the battery is prolonged. The partial discharge sensor is arranged in an annular mode and is installed on the radial circumference of the cable connector in clearance fit with the cable connector. The partial discharge sensor works in combination with the event mode and the timing mode of the existing partial discharge sensor. When the partial discharge sensor does not detect that the cable joint has abnormal discharge, the partial discharge sensor always works according to the dormancy and awakening rules set by the timer in the control unit, so that the power consumption can be reduced to be extremely low. And when abnormal discharge exists, activating the partial discharge sensor based on the event mode to immediately activate and collect, judging with a preset threshold value, and simultaneously sending a signal to wake up the control unit to work if the preset threshold value is exceeded. Similarly, if other sensing units, such as a temperature sensor, activate the control unit due to the fact that the temperature of the collected environment is too high, the control unit can also activate the partial discharge sensor, so that complementation can be formed, low power consumption is achieved, a blind area is avoided, interval detection is avoided, compared with the combination of the existing real-time mode and the existing practice mode or energy is saved, and the problem that the power equipment online monitoring device is short in service life due to the fact that the energy consumption of a built-in battery is insufficient is solved. Further, this application the sensor is put in office possesses dormancy/activation and sets for the function, and the extremely low power consumption standby during the dormancy is activated and begins to gather after receiving the host computer instruction, possesses threshold value signal decision function, partial discharge eigenvalue calculation and automatic extraction function, can be with the threshold value parameter of crossing of extracting in real time save board carry RAM and upload according to the host computer instruction. The working frequency band of the partial discharge sensor is 3MHz-200 MHz; it should be noted that the operating frequency band of the partial discharge sensor can be narrowed in the frequency band range according to the actual operating environment, so as to increase the stability and accuracy of the partial discharge sensor. The partial discharge signal conditioning component comprises a filter, 3MHz-30MHz, 30MHz-60MHz and 60MHz-200 MHz. The amplifier has a bandwidth of 3MHz-200MHz and gains of 10dB, 20dB, 30dB and 40dB switched in four steps. The detector is used for active high-sensitivity detection, and the input signal is a pulse signal. Of course, although no substantial improvement is made in the principle of partial discharge detection, the detection logic is changed after the flat plate is arranged in a ring shape in the existing partial discharge sensor, so that more comprehensive detection effect can be satisfied with extremely low power consumption compared with the prior art. Indeed, the above arrangement is not the only way to achieve the idea of the present invention, and other numerical parameters or ranges can be set within the range according to the actual cable joint, without the need of creating a labor by those skilled in the art, or the range can be enlarged or reduced based on the above parameter range, so as to satisfy the coordination among the sensors, the controller and the power source, which is not limited in the present application.
Has the advantages that: the invention collects the information of the environment where the cable joint is located by the timer timing wake-up control unit and sends the information at a timing, and can greatly save the loss of the electric energy of the battery on the premise of monitoring the working condition of the cable joint, so that one lithium thionyl chloride battery can be normally used for about 5 years. Meanwhile, the cost input of communication flow can be reduced by sending information at fixed time, and the loss of the NB communication antenna to electric energy can also be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic diagram of the control unit for information collection and transmission;
FIG. 3 is a block diagram of the architecture of the present invention;
fig. 4 is a schematic cross-sectional view of the installation of the present invention in a wireline well.
In the figure: 1-an explosion-proof shell; 2-partial discharge sensor; 3-cable joint; 4-a first temperature control switch; 5-a second temperature control switch; 6-a third temperature control switch; 7-a first temperature sensor; 8-a second temperature sensor; 9-a third temperature sensor; 10-a fire extinguishing device; 11-a water level sensor; 12-a control unit; a 13-NB communication antenna; 14-a cable; 15-a displacement sensor; 16-a vibration sensor; 17-gas detection sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The preferred embodiment:
this embodiment will be described and explained in detail with reference to the accompanying drawings 1-4. The cable joint explosion-proof fire extinguishing and temperature and partial discharge comprehensive online monitoring device comprises an explosion-proof shell 1 which hermetically wraps and fixes a cable joint 3 to be detected through upper and lower covers, a control unit 12 serving as an information processing center is detachably and fixedly mounted outside the explosion-proof shell 1, the control unit 12 is respectively and electrically connected with a water level sensor 11 which is mounted on the outer side of the explosion-proof shell 1 and used for detecting the environmental water level of the cable joint 3, and a displacement sensor 15 which is mounted at the cable wellhead part and used for detecting the opening and closing of a well cover; and the temperature sensing unit is arranged in the explosion-proof shell 1 and is tightly attached to the surface of the cable joint 3 for detection, and the temperature sensing unit comprises a first temperature sensor 7, a second temperature sensor 8 and a third temperature sensor 9 which are respectively arranged at two ends and the middle part of the cable joint 13. The purpose of providing a plurality of temperature sensors and the purpose of providing a plurality of temperature controlled switches have similar effects, one of which is that the dissipation of heat is caused by the armouring of the surface of the cable joint 3, and the speed of heat transfer is reduced. Because the cable joint 3 has a certain length, generally more than thirty centimeters, the temperature of the heating point cannot be timely detected by arranging a single temperature sensor. Both ends and the middle part of the cable joint 3 are provided with temperature sensors, so that blind areas of temperature measurement can be effectively avoided, and the accuracy of temperature detection is improved. The temperature control unit of the work of the control unit 12 is triggered through the change of the temperature, and respectively with the control unit 12 is electrically connected with the fire extinguishing device 10 for extinguishing fire and reducing the temperature in the explosion-proof shell 1, the partial discharge sensor 2 for detecting partial discharge is sleeved on the circumference of the outer side of the cable joint 3, monitoring information collected by the control unit 12 is sent to a monitoring center through the NB communication antenna 13 connected with the control unit 12 at regular time, and a battery for supplying power is arranged in the monitoring center. The control unit 12 comprises a controller, and a communication module, a partial discharge module and a fire extinguishing module which are electrically connected with the controller, wherein the communication module is used for collecting monitoring information sent by the controller at regular time and sending the monitoring information through the NB communication antenna 13; the partial discharge module converts an analog signal acquired by the partial discharge sensor 2 into a digital signal and sends the digital signal to the controller; the fire extinguishing module is used for sending the command sent by the controller and triggering the fire extinguishing device 10. The temperature control unit comprises a first temperature control switch 4, a second temperature control switch 5 and a third temperature control switch 6 which are conducted according to different temperatures and are respectively arranged at two ends and the middle part of the cable joint 13; any one or more of the temperature control switches are closed and can trigger the controller to work, the controller compares the preset threshold value with the temperature value corresponding to the closed temperature control switch, and when the actual temperature value exceeds the preset threshold value, the controller sends a starting instruction to the fire extinguishing module, and the fire extinguishing module starts the fire extinguishing device 10. Temperature detect switch adopts the thermal energy switch of physical structure, set for the temperature detect switch that different temperature values switched on according to actual cable joint operating conditions, because 3 outsides of cable joint have the armor, consequently if 3 inside emergence abnormalities of cable joint, the heat-conduction has the inhomogeneous condition very probably, consequently, set for three temperature detect switch and can avoid leading to untimely controller work of starting out because of 3 local faults of cable joint generate heat at the both ends head of cable joint 3 and middle part, in time gather and send the alarm information of gathering to the surveillance center.
Working principle and function explanation:
the advantage of integrating the above-mentioned on-line monitoring device on the explosion-proof housing 1 lies in that the leakproofness of the component installed in the explosion-proof housing 1 can be guaranteed to and not influenced by the external world, better operational environment can be provided, avoid environmental reasons to lead to components and parts trouble. Because the existing cables are buried underground, the manpower cost investment for power grid maintenance can be greatly saved by reducing the overhaul caused by non-cable faults as much as possible. All the detection information is stored and calculated through the control unit 12, which is a collection center and a processing center of all the information of the online monitoring device, and the control unit 12 can match with a proper MCU according to the specific models selected by the water level sensor 11, the partial discharge sensor 2 and the temperature sensing unit. Indeed, although there are many types of sensors and types of the control unit 12 that meet the monitoring requirements, the selection principle should be selected according to low energy consumption, because the fault monitoring of the cable connector 3 generally requires a service life of several years for one-time installation, and therefore, the problem of energy consumption supply of the built-in battery should be considered, and therefore, the use of low-power components is beneficial to prolonging the service life. In order to further realize low energy consumption, the control logic in the control unit 12 is realized by a timer, wherein the set time t is 60min, which is a sleep cycle of the control unit 12, the control unit 12 wakes up once every 60min, and simultaneously all sensors, including the displacement sensor 15, the water level sensor 11 and the temperature sensor forming the temperature sensing unit, start to work and collect corresponding displacement data, water level data and temperature data once, and store the displacement data, water level data and temperature data in the control unit 12, and when the collection time n is 12 times, the controller sends all data collected for 1 to 12 times to a background monitoring center through an NB communication antenna, so that the background monitoring center can obtain the real-time states of the corresponding cable joints 3 within 12 60 min. Meanwhile, the control unit 12 also has an important function of comparing the actual environmental conditions with the preset conditions of triggering the fire extinguishing apparatus 10, and when the preset conditions are reached, the control unit 12 sends a triggering electric signal to the fire extinguishing apparatus 10 to trigger the fire extinguishing apparatus 10 to extinguish the fire, so as to achieve accidents such as explosion caused by the fire of the cable joint 3.
And (4) normal monitoring state: the working flow of this embodiment is specifically shown in fig. 2, where the ordinate T represents time, h represents hours, and the time T is set to 60min, that is, information is collected once per hour, the monitoring information collected 12 times is once cleared up by the communication module through the controller every 12 hours, and then is sent to the monitoring center through the NB communication antenna, so that the monitoring center can archive all the monitored information, and the actual conditions of all the cable connectors 3 installed with the monitoring device in the whole power grid are integrally controlled. The non-acquisition time node controller and all the sensors are in a dormant state, so that the consumption of power can be greatly saved. It is worth to be noted that each on-line detection device has an independent number, and the monitoring center knows the actual condition of each cable joint 3 through the position information corresponding to each number, and when an abnormal fault occurs, the monitoring center can timely, accurately and quickly manually arrive at the site to perform fault removal. Meanwhile, the collection time period t may also be set to be a time period of 2 hours or 3 hours or longer or shorter, and similarly, the period for sending information may be 1 time a day, 2 times a day, or 1 time a day. The actual setting can be set according to the environment where the actual cable joint is located, but because the capacity of the battery is fixed, the higher the frequency of collecting or transmitting information is, the greater the power consumption is, and the shorter the service life of the battery is; meanwhile, the more frequently the information is collected, the higher the updating frequency is, and the better the accuracy is.
An abnormal monitoring state: the abnormal monitoring is not limited to the regular work of normal monitoring collection. The monitored conditions are reported in real time in case of emergency, for example, the alarm temperature is preset to be three levels by the controller, the alarm temperature is respectively collected by the first temperature sensor 7, the second temperature sensor 8 and the third temperature sensor 9, and meanwhile, the controller is triggered to release the dormant state corresponding to the first temperature control switch 4, the second temperature control switch 5 and the third temperature control switch 6. The closed temperatures of the first temperature control switch 4, the second temperature control switch 5 and the third temperature control switch 6 are set in a ladder mode and are respectively 70 ℃, 90 ℃ and 120 ℃, if the temperature rises very slowly, the first temperature control switch 4 is closed when the temperature exceeds 70 ℃, the controller is triggered at the moment, after the controller is in a sleep state, the sensors connected with the controller and including the first temperature sensor 7, the second temperature sensor 8 and the third temperature sensor 9 timely acquire information and send the information to the controller, and finally the information is sent to a monitoring center through an NB communication antenna 12. If the temperature rise speed is very fast, two or three temperature control switches are closed in a very short time, for example, 1 minute, then the controller can send out a signal for triggering the fire extinguishing device 10 to extinguish fire in time while triggering the controller to collect and send information; meanwhile, no matter how fast the temperature rises, if the temperature collected by the third temperature sensor 9 exceeds 120 ℃, the controller still enables the fire extinguishing device 10 to trigger fire extinguishing. In an abnormal state, once the temperature control switch triggers the controller, information is immediately collected once and sent to the monitoring center, so that the condition of the fault is timely mastered, and the follow-up fault is prevented from occurring and even causing larger fault and loss. The mode that normal monitoring state and abnormal monitoring state are combined mutually is adopted, energy conservation and monitoring timeliness can be greatly realized, fault solving time cannot be omitted or delayed, more battery power cannot be consumed in the normal working state, and effective monitoring time is long. In this embodiment the sensor 2 is put in office and adopts cyclic annular setting to install in the outer circumference of cable joint 3, and the beneficial effect who sets up like this is put the sensor sensitivity higher than current cubic office, avoids the problem that partial discharge can not accurately detect.
In this embodiment, a vibration sensor 16 for detecting vibration of the cable connector 3 and a gas detection sensor 17 for detecting abnormal gas in the explosion-proof housing 1 are further mounted on the inner side wall of the explosion-proof housing 1. The gas detection sensor 17 is used for detecting abnormal gas generated in the explosion-proof shell 1, because the temperature sensor is arranged outside the armor of the cable connector 3, and under the condition of non-abnormal serious leakage, the temperature detection on the surface of the cable connector 3 has hysteresis, but the plastic armor outside the heated cable connector 3 can generate abnormal gas, the abnormal gas generated according to the material difference of the surface insulation armor is different, and the gas detection sensor 17 is used for detecting whether the abnormal gas exists or not and monitoring whether the cable connector 3 is in a normal state or not from another dimension. The battery comprises a lithium thionyl chloride battery and a super capacitor connected with the lithium thionyl chloride battery in parallel. The fire extinguishing device 10 adopts a superfine dry powder fire extinguisher or an aerosol fire extinguisher. The existing small-sized superfine dry powder fire extinguisher or aerosol fire extinguisher has excellent fire extinguishing performance for a closed space and mature technology, and the lithium thionyl chloride battery can ensure longer power supply endurance so as to ensure the service life of the monitoring device under the condition of not replacing the battery; meanwhile, the super capacitor is connected in parallel to the lithium thionyl chloride battery, so that power guarantee can be provided when large power is needed for supplying in a short time, and unstable current and voltage output is avoided. For example, at the starting moment of the fire extinguishing apparatus 10, the stability of the super capacitor connected in parallel with the lithium thionyl chloride battery is much higher than that of the single lithium thionyl chloride battery. Meanwhile, the parallel super capacitor can protect the lithium thionyl chloride battery, and the service life of the battery is prolonged.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. Cable joint explosion-proof fire extinguishing and temperature, partial discharge comprehensive on-line monitoring device includes and closes cable joint (3) sealed parcel that will wait to detect and explosion-proof casing (1) fixed through upper and lower lid, its characterized in that: a control unit (12) serving as an information processing center is detachably and fixedly mounted on the outer portion of the explosion-proof shell (1), the control unit (12) is electrically connected with a water level sensor (11) which is mounted on the outer side of the explosion-proof shell (1) and used for detecting the environmental water level of the cable joint (3), and a displacement sensor (15) which is mounted at a cable well mouth portion and used for detecting the opening and closing of a well cover is electrically connected with the control unit (12); and the temperature sensing unit is arranged in the explosion-proof shell (1) and is tightly attached to the surface of the cable joint (3) for detection, the temperature control unit works through the change of the temperature, and the fire extinguishing device (10) is electrically connected with the control unit (12) and is used for extinguishing fire and reducing the temperature in the explosion-proof shell (1), the local discharge sensor (2) used for detecting local discharge is sleeved on the circumference of the outer side of the cable joint (3), the monitoring information collected by the control unit (12) is sent to a monitoring center through an NB communication antenna (13) connected with the control unit (12) at regular time, and a battery used for supplying power is arranged in the monitoring center.
2. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 1, characterized in that: the control unit (12) comprises a controller, and a communication module, a partial discharge module and a fire extinguishing module which are electrically connected with the controller, wherein the communication module is used for acquiring monitoring information sent by the controller at regular time and sending the monitoring information through the NB communication antenna (13); the partial discharge module converts analog signals collected by the partial discharge sensor (2) into digital signals and sends the digital signals to the controller; the fire extinguishing module is used for sending the command sent by the controller and triggering the fire extinguishing device (10).
3. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 2, characterized in that: the temperature control unit comprises a first temperature control switch (4), a second temperature control switch (5) and a third temperature control switch (6), which are conducted according to different temperatures and are respectively arranged at the two ends and the middle part of the cable joint (13); the controller works, the controller compares a preset threshold value with a temperature value corresponding to the closed temperature control switch through comparison, and when the actual temperature value exceeds the preset threshold value, the controller sends a starting instruction to the fire extinguishing module, and the fire extinguishing module starts the fire extinguishing device (10).
4. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 3, characterized in that: the temperature sensing unit comprises a first temperature sensor (7), a second temperature sensor (8) and a third temperature sensor (9) which are respectively arranged at two ends and the middle part of the cable joint (13).
5. The cable joint explosion-proof fire-extinguishing and temperature and partial discharge integrated online monitoring device according to any one of claims 2 to 4, characterized in that: and a vibration sensor (16) for detecting the vibration of the cable joint (3) and a gas detection sensor (17) for detecting abnormal gas in the explosion-proof shell (1) are further installed on the inner side wall of the explosion-proof shell (1).
6. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 1, characterized in that: the battery comprises a lithium thionyl chloride battery and a super capacitor connected with the lithium thionyl chloride battery in parallel.
7. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 1, characterized in that: the fire extinguishing device (10) adopts an ultrafine dry powder fire extinguisher or an aerosol fire extinguisher.
8. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 1, characterized in that: the partial discharge sensor (2) is arranged in an annular mode and is arranged on the radial circumference of the cable connector (3) in clearance fit with the cable connector (3).
9. The cable joint explosion-proof fire extinguishing and temperature and partial discharge integrated online monitoring device according to claim 8, characterized in that: the partial discharge sensor (2) is also connected with a partial discharge signal conditioning component, the partial discharge signal conditioning component comprises a filter, and the filtering range of the filter is any one of 3MHz-30MHz, 30MHz-60MHz and 60MHz-200 MHz; the bandwidth is 3MHz-200MHz, the amplifier and detector with gain of 10dB, 20dB, 30dB, 40dB are selected alternatively.
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| CN111551285A (en) * | 2020-06-24 | 2020-08-18 | 郑州师范学院 | Cable tunnel temperature monitoring alarm system |
| CN111750928A (en) * | 2020-06-16 | 2020-10-09 | 国网上海市电力公司 | Cable channel comprehensive monitoring device |
| CN112152182A (en) * | 2020-10-15 | 2020-12-29 | 深圳供电局有限公司 | Fire-resistant protection device for cable intermediate joint, manufacturing and using method |
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| CN112462204A (en) * | 2020-10-19 | 2021-03-09 | 深圳供电局有限公司 | Cable middle head partial discharge detection device and online monitoring system |
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| CN112485382A (en) * | 2020-12-06 | 2021-03-12 | 四川大学 | High-voltage cable intermediate joint operation state detection device and method based on characteristic gas monitoring |
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| CN114069842A (en) * | 2021-10-26 | 2022-02-18 | 广西电网有限责任公司崇左供电局 | Intelligent monitoring device for explosion-proof box of cable intermediate joint and implementation method |
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| CN115400369A (en) * | 2022-08-03 | 2022-11-29 | 国网湖北省电力有限公司黄石供电公司 | Cable fire-fighting linkage system based on multi-sensor fusion |
| CN115389855A (en) * | 2022-10-26 | 2022-11-25 | 高勘(广州)技术有限公司 | Method and system for monitoring cable equipment |
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