CN116500356A - Non-electric quantity on-line detection device and detection method for 220kV power high-voltage insulated cable fault - Google Patents
Non-electric quantity on-line detection device and detection method for 220kV power high-voltage insulated cable fault Download PDFInfo
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- CN116500356A CN116500356A CN202310289813.6A CN202310289813A CN116500356A CN 116500356 A CN116500356 A CN 116500356A CN 202310289813 A CN202310289813 A CN 202310289813A CN 116500356 A CN116500356 A CN 116500356A
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- 238000001514 detection method Methods 0.000 title claims abstract description 67
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 122
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 55
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 35
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 31
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 31
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 31
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 31
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 31
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000001257 hydrogen Substances 0.000 claims abstract description 30
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 30
- 239000010410 layer Substances 0.000 claims abstract description 14
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 9
- -1 palladium hydrogen Chemical class 0.000 claims abstract description 8
- 239000011241 protective layer Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 44
- 238000005485 electric heating Methods 0.000 claims description 18
- 239000011229 interlayer Substances 0.000 claims description 18
- 150000002431 hydrogen Chemical class 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- G01R31/003—Environmental or reliability tests
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a non-electric quantity on-line detection device and a detection method for a 220kV power high-voltage insulated cable fault, wherein the non-electric quantity on-line detection device comprises a high-voltage insulated cable, a high-purity nitrogen gas inlet module and a non-electric quantity on-line detection module which are arranged at two ends of the high-voltage insulated cable, and an air inlet connector and an air outlet connector are respectively connected with outermost protective layers at two ends of the high-voltage insulated cable; the nitrogen gas inlet module is connected with the air inlet joint; the non-electric quantity on-line detection module comprises an air outlet pipe connected with an air outlet joint, and a low-molecular hydrocarbon gas sensor, a carbon dioxide sensor, a carbon monoxide sensor and a palladium hydrogen sensor are sequentially arranged on the air outlet pipe along the gas flow direction. The high-voltage insulating cable fault detection device has the advantages that the characteristic that fault characteristic gas can be generated when the high-voltage insulating cable breaks down is utilized, the fault characteristic gas filled in the multi-layer gap space of the high-voltage insulating cable is subjected to targeted non-electric quantity detection, whether the high-voltage insulating cable breaks down or has hidden danger is judged, and then the high-voltage insulating cable in electrified operation can be timely detected online.
Description
Technical field:
the invention belongs to the technical field of high-voltage insulated cable detection in the power industry, and particularly relates to a non-electric quantity on-line detection device and a detection method for a 220kV power high-voltage insulated cable fault.
The background technology is as follows:
in recent years, with the continuous increase of the requirements of the transmission capacity and the power supply quality of the urban power grid, high-voltage insulated cables have become a necessary choice for constructing a reliable urban power grid. The high-voltage insulated cable is of a multilayer protection wrapping structure, the innermost part of the high-voltage insulated cable is a conductor inner core, and the outer wrapping section interlayer is generally divided into: conductor shielding, insulation, insulating shielding, water-blocking buffer layer, aluminum sheath, outer sheath, etc., as shown in fig. 1; besides the conductors at two ends of the whole high-voltage insulated cable are strictly kept in sealing connection through the cable heads, other outer surface parts and the outside are sealed, and gas between interlayer layers in the cable can mutually permeate.
Because the high-voltage insulated cable is of an armor-wrapped multilayer structure and is mostly buried in the ground deeply, if the middle barrier of the armor of the high-voltage insulated cable is wetted or damaged during operation, the middle barrier is difficult to discover in time, and faults generally need to be developed to a certain extent when the middle barrier of the armor of the high-voltage insulated cable is wetted and damaged, the faults can be detected by special electrical measuring instruments through obvious electric quantity change signals, or the high-voltage insulated cable is powered off, and defects are discovered by insulating, withstand voltage or leakage current test detection, so that the faults are often seriously delayed from the discovery and development of the faults. Therefore, there is a need to design a device and a method for detecting a high-voltage insulated cable in live operation in a timely and online manner.
The invention comprises the following steps:
the invention aims at improving the problems existing in the prior art, namely the technical problem to be solved by the invention is to provide the non-electric quantity on-line detection device and the detection method for the faults of the 220kV power high-voltage insulated cable, which are reasonable in design and can be used for on-line non-electric quantity detection of the incoming line of the high-voltage insulated cable.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a non-electric quantity on-line measuring device of 220kV electric power high voltage insulation cable trouble, includes high voltage insulation cable, locates high-purity nitrogen gas air inlet module and the non-electric quantity on-line measuring module at high voltage insulation cable both ends respectively, the both ends protective layer of high voltage insulation cable is connected with air inlet joint and air outlet joint respectively; the output end of the nitrogen gas inlet module is connected with an air inlet joint; the non-electric quantity on-line detection module comprises an air outlet pipe connected with an air outlet joint, and a low-molecular hydrocarbon gas sensor, a carbon dioxide sensor, a carbon monoxide sensor and a palladium hydrogen sensor are sequentially arranged on the air outlet pipe along the gas flow direction.
Further, the high-purity nitrogen gas inlet module comprises a nitrogen gas inlet pipe with an electric heating sleeve sleeved on the outer side, one end of the nitrogen gas inlet pipe is connected with a stop valve of the output end of the high-purity nitrogen gas cylinder, and the other end of the nitrogen gas inlet pipe is connected with an air inlet joint.
Further, the nitrogen gas inlet pipe is sequentially provided with a pressure reducing valve, a pressure stabilizing valve, a pressure sensor and a temperature sensor along the conveying direction of nitrogen gas, and the pressure sensor and the temperature sensor are respectively positioned at two sides of the electric heating sleeve.
Further, the air inlet connector is connected with a first three-way pipe, one end of the first three-way pipe is connected with the nitrogen air inlet pipe through a first electromagnetic valve, and the other end of the first three-way pipe is connected with a first emptying pipe through a first emptying electromagnetic valve.
Further, the air outlet joint is connected with a second three-way pipe through a connecting pipeline, and a humidity sensor is arranged on the connecting pipeline; one end of the second three-way pipe is connected with the air outlet pipe through a second electromagnetic valve, and the other end of the second three-way pipe is connected with the second emptying pipe through a second emptying electromagnetic valve.
Further, the device also comprises a control module, wherein the input end of the control module is electrically connected with the output ends of the palladium-grid hydrogen sensor, the carbon monoxide sensor, the carbon dioxide sensor, the low-molecular hydrocarbon gas sensor, the humidity sensor, the temperature sensor and the pressure sensor respectively, and the output end of the control module is electrically connected with the pressure stabilizing valve, the first electromagnetic valve, the second electromagnetic valve, the first emptying electromagnetic valve, the second emptying electromagnetic valve, the electric heating sleeve and the alarm respectively.
Furthermore, joint connection holes are formed in the outermost protective layers at the two ends of the high-voltage insulated cable.
Further, both ends of the high-voltage insulated cable are connected with high-voltage insulated cable terminals, and a vertically arranged cable supporting rod is fixed between the high-voltage insulated cable terminals and the ground.
The other technical scheme adopted by the invention is as follows: a non-electric quantity on-line detection method for a 220kV power high-voltage insulated cable fault comprises the following steps:
(1) The control module presets an exceeding alarm value of humidity, hydrogen, carbon monoxide, carbon dioxide and low-molecular hydrocarbon gas and a setting range of stable temperature and pressure of high-purity nitrogen;
(2) Firstly, starting a temperature sensor and a pressure sensor of a high-purity nitrogen gas inlet module;
(3) Opening a first emptying electromagnetic valve;
(4) The pressure reducing valve is regulated to set output pressure, then the stop valve, the pressure stabilizing valve and the electric heating sleeve on the high-purity nitrogen cylinder are sequentially opened, and the high-purity nitrogen subjected to pressure stabilization and heating is discharged through the first emptying electromagnetic valve;
(5) When the temperature and the pressure of the high-purity nitrogen reach the set values stably, opening a first electromagnetic valve, closing a first emptying electromagnetic valve, and enabling the high-purity nitrogen with stable temperature and pressure to enter an interlayer gap inside the high-voltage insulated cable through an air inlet connector and fill the high-voltage insulated cable along the path until the other end of the high-voltage insulated cable is connected with an air outlet connector;
(6) When the pressure of the pressure sensor reaches a preset value, starting a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor;
(7) Opening a second electromagnetic valve of the non-electric quantity online detection module;
(8) The high-purity nitrogen carries various gases contained between the internal layers of the high-voltage insulated cable, and sequentially flows through a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor together to respectively detect the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low-molecular hydrocarbon gas content, and the detected gases flow out to the atmosphere;
(9) When one or more detection values of the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low molecular hydrocarbon gas content exceed preset standards, an alarm alarms to inform related personnel of further inspection and treatment before;
(10) And after the detection test is finished, sequentially closing: a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor;
(11) Opening a second emptying electromagnetic valve, closing the second electromagnetic valve, and discharging interlayer gap gas inside the high-voltage insulated cable into the atmosphere;
(12) If only the humidity 1 index exceeds the standard, continuing to start the humidity sensor and introducing hot high-purity nitrogen except for alarming by an alarm, heating and drying the inter-layer gaps in the damped high-voltage insulated cable until the humidity reaches the requirement, and then closing the humidity sensor;
(13) Closing the electric heating sleeve and the temperature sensor;
(14) Closing the stop valve, the pressure stabilizing valve and the first electromagnetic valve of the high-purity nitrogen cylinder for the next time, and continuously keeping the pressure reducing valve at a set pressure reducing position so as to be convenient for detection and use for the next time;
(15) When the pressure is reduced to normal pressure, closing the pressure sensor, and closing the second emptying electromagnetic valve;
(16) And ending the non-electric quantity detection test of the high-voltage insulated cable, and waiting for detection of the next period.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, utilizes the characteristic that the high-voltage insulated cable can generate fault characteristic gas when faults occur, carries out targeted non-electric quantity detection aiming at the fault characteristic gas filled in the multi-layer clearance space of the high-voltage insulated cable to judge whether the high-voltage insulated cable has faults or hidden danger, further can timely detect the high-voltage insulated cable in electrified operation on line, powerfully ensures the safe operation of the high-voltage insulated cable, and can well overcome the defect that the electric high-voltage insulated cable cannot quickly detect faults on line in the traditional electrified operation.
Description of the drawings:
FIG. 1 is a schematic view of the internal multilayer laminate structure of a high voltage insulated cable;
FIG. 2 is a schematic view of the construction of an embodiment of the present invention;
FIG. 3 is a view showing the construction of a high purity nitrogen inlet module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a non-electricity online detection module according to an embodiment of the present invention;
fig. 5 is a control schematic block diagram of an embodiment of the present invention.
In the figure:
1-a high voltage insulated cable termination; 2-a high voltage insulated cable head; 3-high voltage insulated cable; 301-conductors; 302-a conductor shield layer; 303 an insulating layer; 304-an insulating shield layer; 305-a water-blocking buffer layer; 306-an aluminum sheath; 307-an outer sheath; 4-a cable support rod; 5-an air inlet joint; 6-a high-purity nitrogen gas inlet module; 7-a high-purity nitrogen bottle; 8-opposite side high voltage insulated cable termination; 9-an air outlet joint; 10-a non-electric quantity on-line detection module; 11-a first tee; 12-a first solenoid valve; 13-a first drain solenoid valve; 14-a temperature sensor; 15-an electric heating sleeve; 16-a pressure sensor; 17-a pressure stabilizing valve; 18-a pressure reducing valve; 19-a stop valve; 20-opening a supporting seal protector; a 21-palladium hydrogen sensor; a 22-carbon monoxide sensor; a 23-carbon dioxide sensor; a 24-low molecular hydrocarbon gas sensor; 25-humidity sensor; 26-a second solenoid valve; 27-a second drain solenoid valve; 28-a first evacuation tube; 29-a second evacuation tube; 30-an air outlet pipe; 31-a second tee; 32-nitrogen inlet pipe.
The specific embodiment is as follows:
the invention will be described in further detail with reference to the drawings and the detailed description.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 2 to 4, the non-electric quantity on-line detection device for the faults of the 220kV power high-voltage insulated cable, according to the invention, when the high-voltage insulated cable is in fault, various materials such as insulation, water resistance, shielding, protection and the like wrapped by the high-voltage insulated cable are pyrolyzed or chemically reacted to generate the characteristics of fault characteristic gas, and the specific non-electric quantity detection is carried out aiming at the fault characteristic gas filled in the multi-layer gap space of the high-voltage insulated cable to judge whether the high-voltage insulated cable is in fault or has hidden danger, so that the high-voltage insulated cable in electrified operation can be detected timely and online, and the specific structure of the detection device is as follows: the high-voltage insulating cable comprises a high-voltage insulating cable 3, a high-purity nitrogen gas inlet module 6 and a non-electric quantity on-line detection module 10 which are respectively arranged at two ends of the high-voltage insulating cable 3, wherein the outermost protective layers at two ends of the high-voltage insulating cable 3 are respectively connected with an inlet joint 5 and an outlet joint 9; the output end of the nitrogen gas inlet module 6 is connected with an air inlet connector 5, and the nitrogen gas inlet module 6 is used for introducing high-purity nitrogen gas into the high-voltage insulating cable 3 through the air inlet connector 5 so as to provide carrier gas for the work of the non-electric quantity on-line detection module; the non-electric quantity on-line detection module 10 comprises an air outlet pipe 30 connected with an air outlet joint 9, fault characteristic gas and high-purity nitrogen in the high-voltage insulated cable 3 are output to the air outlet pipe 30 through the air outlet joint 9, and a low-molecular hydrocarbon gas sensor 24, a carbon dioxide sensor 23, a carbon monoxide sensor 22 and a palladium hydrogen sensor 21 are sequentially arranged on the air outlet pipe 60 along the gas flow direction, wherein the low-molecular hydrocarbon gas sensor 24, the carbon dioxide sensor 23, the carbon monoxide sensor 22 and the palladium hydrogen sensor 21 respectively detect the low-molecular hydrocarbon gas content, the carbon dioxide content, the carbon monoxide content and the hydrogen content.
In this embodiment, the high-purity nitrogen gas inlet module 6 includes a nitrogen gas inlet pipe 32 with an electric heating sleeve 15 sleeved on the outer side, one end of the nitrogen gas inlet pipe 32 is connected with a stop valve 19 provided at the output end of the high-purity nitrogen gas cylinder 7, and the other end of the nitrogen gas inlet pipe 32 is connected with the air inlet joint 5. The high-purity nitrogen output by the high-purity nitrogen cylinder is conveyed to the air inlet joint through the nitrogen air inlet pipe, and the inner diameter of the heating sleeve is in anastomotic contact with the inner diameter of the pipeline so as to heat the high-purity nitrogen in the interlayer gap inside the high-voltage insulated cable in the nitrogen air inlet pipe to a set value.
In this embodiment, the nitrogen inlet pipe 32 is sequentially provided with a pressure reducing valve 18, a pressure stabilizing valve 17, a pressure sensor 16 and a temperature sensor 14 along the conveying direction of nitrogen, and the pressure sensor 16 and the temperature sensor 14 are respectively located at two sides of the electric heating sleeve 15. The temperature sensor measures the temperature of the high-purity nitrogen entering the interlayer gap in the high-voltage insulated cable; the pressure sensor is used for detecting the pressure of the high-purity nitrogen entering the interlayer gap inside the high-voltage insulated cable, and the pressure stabilizing valve controls the pressure of the high-purity nitrogen entering the interlayer gap inside the high-voltage insulated cable according to a preset pressure value.
In this embodiment, the air inlet joint 5 is connected with a first three-way pipe 11, one end of the first three-way pipe 11 is connected with a nitrogen air inlet pipe 32 through a first electromagnetic valve 12, and the other end of the first three-way pipe 11 is connected with a first emptying pipe 28 through a first emptying electromagnetic valve 13.
In this embodiment, the air outlet connector 9 is connected to a second tee 31 through a connecting pipe, and the connecting pipe is provided with a humidity sensor 25, and a humidity detection probe of the humidity sensor is inserted into the pipe; one end of the second three-way pipe 31 is connected with the air outlet pipe 30 through the second electromagnetic valve 26, and the other end of the second three-way pipe 31 is connected with the second emptying pipe 29 through the second emptying electromagnetic valve 27.
In this embodiment, the device further includes a control module, where an input end of the control module is electrically connected to output ends of the palladium hydrogen sensor, the carbon monoxide sensor, the carbon dioxide sensor, the low-molecular hydrocarbon gas sensor, the humidity sensor, the temperature sensor and the pressure sensor, and an output end of the control module is electrically connected to the pressure stabilizing valve, the first electromagnetic valve, the second electromagnetic valve, the first emptying electromagnetic valve, the second emptying electromagnetic valve, the electric heating sleeve and the alarm. It should be noted that the control module is pre-designed and programmed with: the control program for controlling the temperature and pressure stability of high-purity nitrogen and controlling the opening and stopping of each electromagnetic valve and electric heating sleeve.
In this embodiment, the outermost protection layers at two ends of the high-voltage insulated cable are provided with joint connection holes. It should be noted that the joint connection hole is provided with a reinforced protection seal and a support.
In this embodiment, both ends of the high-voltage insulated cable 3 are connected with high-voltage insulated cable terminals, and a vertically arranged cable supporting rod 4 is fixed between the high-voltage insulated cable terminals and the ground.
In this embodiment, the on-line detection device works as follows: the non-electric quantity on-line detection module is used for detecting gas contained in inter-layer gaps in the high-voltage insulated cable by taking high-purity nitrogen output by a high-purity nitrogen inlet module arranged at the other end of the high-voltage insulated cable as carrier gas, wherein a humidity sensor is used for detecting moisture, a palladium-grid hydrogen sensor is used for detecting hydrogen, a carbon monoxide sensor is used for detecting carbon monoxide, a carbon dioxide sensor is used for detecting carbon dioxide, and a low-molecular hydrocarbon gas sensor is used for detecting low-molecular hydrocarbon gas; when one or more detection values of the indexes exceed preset standards, an alarm gives an alarm to inform related personnel of further checking and processing as soon as possible.
In this embodiment, a non-electric quantity online detection method for a fault of a 220kV power high-voltage insulated cable includes the following steps:
(1) The control module presets the exceeding alarm value of humidity, hydrogen, carbon monoxide, carbon dioxide and low molecular hydrocarbon gas, the setting range of temperature and pressure stability of high-purity nitrogen, and the control program for controlling the opening and stopping of each electromagnetic valve and the electric heating sleeve;
(2) Firstly, starting a temperature sensor 14 and a pressure sensor 16 of the high-purity nitrogen gas inlet module 6;
(3) Opening the first drain solenoid valve 13;
(4) The pressure reducing valve 18 is adjusted to set output pressure, then the stop valve 9, the pressure stabilizing valve 17 and the electric heating sleeve 15 on the high-purity nitrogen cylinder 7 are sequentially opened, and the high-purity nitrogen which is stabilized and heated at the moment is discharged through the first emptying electromagnetic valve 13;
(5) When the temperature and the pressure of the high-purity nitrogen reach the set values stably, the first electromagnetic valve 12 is opened, the first emptying electromagnetic valve 13 is closed, the high-purity nitrogen with stable temperature and pressure enters an interlayer gap inside the high-voltage insulated cable through the air inlet joint 5 and fills the high-voltage insulated cable along the way until the other end of the high-voltage insulated cable is connected with the air outlet joint 9;
(6) When the pressure of the pressure sensor 16 reaches a preset value, starting the humidity sensor 20, the palladium-grid hydrogen sensor 21, the carbon monoxide sensor 22, the carbon dioxide sensor 23 and the low-molecular hydrocarbon gas sensor 24;
(7) Opening the second electromagnetic valve 26 of the non-electric quantity on-line detection module 10;
(8) The high-purity nitrogen carries various gases contained between the internal layers of the high-voltage insulated cable, and sequentially flows through a humidity sensor 25, a palladium-grid hydrogen sensor 21, a carbon monoxide sensor 22, a carbon dioxide sensor 23 and a low-molecular hydrocarbon gas sensor 24 together to respectively detect the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low-molecular hydrocarbon gas content, and the detected gases flow out to the atmosphere;
(9) When one or more detection values of the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low molecular hydrocarbon gas content exceed preset standards, an alarm alarms to inform related personnel of further inspection and treatment before;
(10) And after the detection test is finished, sequentially closing: a humidity sensor 25, a palladium-gate hydrogen sensor 21, a carbon monoxide sensor 22, a carbon dioxide sensor 23, a low-molecular hydrocarbon gas sensor 24;
(11) Opening a second emptying electromagnetic valve 27, closing a second electromagnetic valve 26, and discharging interlayer gap gas inside the high-voltage insulated cable into the atmosphere;
(12) If only the 1 index of humidity exceeds the standard, continuing to start the humidity sensor 25 and introducing hot high-purity nitrogen except for alarming by an alarm, heating and drying the inter-layer gaps in the damped high-voltage insulated cable until the humidity reaches the requirement, and then closing the humidity sensor 25;
(13) Closing the electric heating sleeve 15 and the temperature sensor 14;
(14) Closing the stop valve 19, the pressure stabilizing valve 17 and the first electromagnetic valve 12 of the high-purity nitrogen cylinder for the next time, and continuously keeping the pressure reducing valve 18 at a set pressure reducing position so as to be convenient for the next detection and use;
(15) When the pressure drops to normal pressure, the pressure sensor 16 is closed, and the second emptying electromagnetic valve 27 is closed;
(16) And ending the non-electric quantity detection test of the high-voltage insulated cable, and waiting for detection of the next period.
The invention has the advantages that: (1) When the high-voltage insulated cable breaks down, various materials such as insulation, water resistance, shielding and protection are wrapped by the high-voltage insulated cable, and the materials can be pyrolyzed or chemically reacted to generate fault characteristic gas, and the specific non-electric quantity detection is carried out on the fault characteristic gas filled in the multi-layer gap space of the high-voltage insulated cable, so that the non-electric quantity detection on the high-voltage insulated cable can be realized on line in the operation of the high-voltage insulated cable, the damp, overheat and discharge faults of the armoured interlayer of the high-voltage insulated cable can be found in time, the defect that the electric high-voltage insulated cable cannot be rapidly subjected to the on-line detection in the traditional live operation can be well overcome, and the method contributes to the safe operation of a power grid; (2) The high-purity nitrogen gas inlet module with stable heating temperature and stable voltage range provides carrier gas for the work of the non-electric quantity on-line detection module, and can provide heating, drying and moisture removal for the inter-layer interval part of the high-voltage insulated cable, thereby effectively ensuring the safe operation of the high-voltage insulated cable.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (9)
1. The utility model provides a 220kV electric power high voltage insulation cable trouble's non-electric quantity on-line measuring device which characterized in that: the high-voltage insulating cable comprises a high-voltage insulating cable, a high-purity nitrogen gas inlet module and a non-electric quantity on-line detection module which are respectively arranged at two ends of the high-voltage insulating cable, wherein the outermost protective layers at two ends of the high-voltage insulating cable are respectively connected with an air inlet joint and an air outlet joint; the output end of the nitrogen gas inlet module is connected with an air inlet joint; the non-electric quantity on-line detection module comprises an air outlet pipe connected with an air outlet joint, and a low-molecular hydrocarbon gas sensor, a carbon dioxide sensor, a carbon monoxide sensor and a palladium hydrogen sensor are sequentially arranged on the air outlet pipe along the gas flow direction.
2. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables according to claim 1, characterized in that: the high-purity nitrogen gas inlet module comprises a nitrogen gas inlet pipe, wherein an electric heating sleeve is sleeved on the outer side of the nitrogen gas inlet pipe, one end of the nitrogen gas inlet pipe is connected with a stop valve at the output end of the high-purity nitrogen gas cylinder, and the other end of the nitrogen gas inlet pipe is connected with an air inlet joint.
3. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables according to claim 2, characterized in that: the nitrogen gas inlet pipe is sequentially provided with a pressure reducing valve, a pressure stabilizing valve, a pressure sensor and a temperature sensor along the conveying direction of nitrogen gas, and the pressure sensor and the temperature sensor are respectively positioned at two sides of the electric heating sleeve.
4. A non-electrical on-line detection device for faults of 220kV power high voltage insulated cables according to claim 3, characterized in that: the air inlet connector is connected with a first three-way pipe, one end of the first three-way pipe is connected with a nitrogen air inlet pipe through a first electromagnetic valve, and the other end of the first three-way pipe is connected with a first emptying pipe through a first emptying electromagnetic valve.
5. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables of claim 4, wherein: the air outlet joint is connected with a second three-way pipe through a connecting pipeline, and a humidity sensor is arranged on the connecting pipeline; one end of the second three-way pipe is connected with the air outlet pipe through a second electromagnetic valve, and the other end of the second three-way pipe is connected with the second emptying pipe through a second emptying electromagnetic valve.
6. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables of claim 5, wherein: the device comprises a palladium grid, a carbon monoxide sensor, a carbon dioxide sensor, a low-molecular hydrocarbon gas sensor, a humidity sensor, a temperature sensor and a pressure sensor, and is characterized by further comprising a control module, wherein the input end of the control module is electrically connected with the output ends of the palladium grid hydrogen sensor, the carbon monoxide sensor, the carbon dioxide sensor, the low-molecular hydrocarbon gas sensor, the humidity sensor, the temperature sensor and the pressure sensor respectively, and the output end of the control module is electrically connected with a pressure stabilizing valve, a first electromagnetic valve, a second electromagnetic valve, a first emptying electromagnetic valve, a second emptying electromagnetic valve, an electric heating sleeve and an alarm respectively.
7. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables according to claim 1, characterized in that: and joint connecting holes are formed in the outermost protective layers at the two ends of the high-voltage insulated cable.
8. The non-electrical on-line detection device for faults of 220kV power high voltage insulated cables according to claim 1, characterized in that: the high-voltage insulated cable is characterized in that two ends of the high-voltage insulated cable are connected with high-voltage insulated cable terminals, and a vertically arranged cable supporting rod is fixed between the high-voltage insulated cable terminals and the ground.
9. A non-electric quantity on-line detection method for a 220kV power high-voltage insulated cable fault is characterized by comprising the following steps of: a non-electrical on-line detection device comprising a fault employing the 220kV power high voltage insulated cable of claim 6, comprising the steps of:
(1) The control module presets an exceeding alarm value of humidity, hydrogen, carbon monoxide, carbon dioxide and low-molecular hydrocarbon gas and a setting range of stable temperature and pressure of high-purity nitrogen;
(2) Firstly, starting a temperature sensor and a pressure sensor of a high-purity nitrogen gas inlet module;
(3) Opening a first emptying electromagnetic valve;
(4) The pressure reducing valve is regulated to set output pressure, then the stop valve, the pressure stabilizing valve and the electric heating sleeve on the high-purity nitrogen cylinder are sequentially opened, and the high-purity nitrogen subjected to pressure stabilization and heating is discharged through the first emptying electromagnetic valve;
(5) When the temperature and the pressure of the high-purity nitrogen reach the set values stably, opening a first electromagnetic valve, closing a first emptying electromagnetic valve, and enabling the high-purity nitrogen with stable temperature and pressure to enter an interlayer gap inside the high-voltage insulated cable through an air inlet connector and fill the high-voltage insulated cable along the path until the other end of the high-voltage insulated cable is connected with an air outlet connector;
(6) When the pressure of the pressure sensor reaches a preset value, starting a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor;
(7) Opening a second electromagnetic valve of the non-electric quantity online detection module;
(8) The high-purity nitrogen carries various gases contained between the internal layers of the high-voltage insulated cable, and sequentially flows through a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor together to respectively detect the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low-molecular hydrocarbon gas content, and the detected gases flow out to the atmosphere;
(9) When one or more detection values of the moisture content, the hydrogen content, the carbon monoxide content, the carbon dioxide content and the low molecular hydrocarbon gas content exceed preset standards, an alarm alarms to inform related personnel of further inspection and treatment before;
(10) And after the detection test is finished, sequentially closing: a humidity sensor, a palladium-grid hydrogen sensor, a carbon monoxide sensor, a carbon dioxide sensor and a low-molecular hydrocarbon gas sensor;
(11) Opening a second emptying electromagnetic valve, closing the second electromagnetic valve, and discharging interlayer gap gas inside the high-voltage insulated cable into the atmosphere;
(12) If only the humidity 1 index exceeds the standard, continuing to start the humidity sensor and introducing hot high-purity nitrogen except for alarming by an alarm, heating and drying the inter-layer gaps in the damped high-voltage insulated cable until the humidity reaches the requirement, and then closing the humidity sensor;
(13) Closing the electric heating sleeve and the temperature sensor;
(14) Closing the stop valve, the pressure stabilizing valve and the first electromagnetic valve of the high-purity nitrogen cylinder for the next time, and continuously keeping the pressure reducing valve at a set pressure reducing position so as to be convenient for detection and use for the next time;
(15) When the pressure is reduced to normal pressure, closing the pressure sensor, and closing the second emptying electromagnetic valve;
(16) And ending the non-electric quantity detection test of the high-voltage insulated cable, and waiting for detection of the next period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310289813.6A CN116500356A (en) | 2023-03-23 | 2023-03-23 | Non-electric quantity on-line detection device and detection method for 220kV power high-voltage insulated cable fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310289813.6A CN116500356A (en) | 2023-03-23 | 2023-03-23 | Non-electric quantity on-line detection device and detection method for 220kV power high-voltage insulated cable fault |
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| Publication Number | Publication Date |
|---|---|
| CN116500356A true CN116500356A (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310289813.6A Pending CN116500356A (en) | 2023-03-23 | 2023-03-23 | Non-electric quantity on-line detection device and detection method for 220kV power high-voltage insulated cable fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116500356A (en) |
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- 2023-03-23 CN CN202310289813.6A patent/CN116500356A/en active Pending
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