CN118010279A - Impact explosion detection method and system for cable joint - Google Patents
Impact explosion detection method and system for cable joint Download PDFInfo
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- CN118010279A CN118010279A CN202311628232.7A CN202311628232A CN118010279A CN 118010279 A CN118010279 A CN 118010279A CN 202311628232 A CN202311628232 A CN 202311628232A CN 118010279 A CN118010279 A CN 118010279A
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- 238000004880 explosion Methods 0.000 title claims abstract description 88
- 238000001514 detection method Methods 0.000 title claims description 39
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- 238000004088 simulation Methods 0.000 claims abstract description 42
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- 238000004146 energy storage Methods 0.000 claims description 47
- 230000015556 catabolic process Effects 0.000 claims description 22
- 238000012545 processing Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 15
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- 238000007599 discharging Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000002360 explosive Substances 0.000 claims description 8
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- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
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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
- G01R31/1209—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 using acoustic measurements
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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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- 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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Abstract
A method and apparatus for detecting an impact explosion of a cable joint, the method comprising the steps of: simultaneously connecting an impact simulation power supply and a power frequency power supply to two sides of the cable joint to simulate a fault line with impact voltage, and assembling an explosion-proof shell outside the cable joint; feeding back the working state of the cable connector by using a voltage and current sensor, and adjusting the output parameters of the impact simulation power supply based on the working state; the explosion impact force of the explosion-proof housing is monitored by a piezoelectric sensor. The invention accurately simulates the rules and limit parameters between the impact force born by the high-voltage cable insulating shell under the combined action of lightning impact, adjustable impact voltage and power frequency current of the high-voltage cable intermediate joint, and provides support for the material selection and structural design of the high-voltage intermediate joint explosion-proof shell.
Description
Technical Field
The invention relates to the field of power systems, in particular to an impact explosion detection method and an impact explosion detection system for a cable joint.
Background
The power cable is an important device for electric energy transmission in the transmission line, is usually laid in a tunnel, calandria and bent frame mode, and causes electric field distortion and insulation performance degradation of a high-voltage cable joint due to factors such as rough installation, long-distance transportation, long-term load and the like, and finally, connection between a high-voltage cable core wire and an outer shielding layer/grounding side occurs, so that power frequency arc discharge, explosion or fire disaster is caused.
In order to prevent fire disaster and other secondary accidents caused by explosion due to short-circuit faults of the high-voltage cable, many research institutions and enterprises begin to research and design the middle joint of the high-voltage cable with the explosion-proof shell, and the impact resistance of the explosion-proof shell is usually tested by adopting a certain equivalent of explosive. With the development of computer simulation technology, the explosion-proof characteristic of the middle joint of the high-voltage cable with the explosion-proof shell under the action of the power frequency current arc can be obtained through simulation calculation, but the research literature on the aspect is not much disclosed. Importantly, no comprehensive consideration is given to the electromagnetic environment in which the high-voltage cable actually operates in the explosive explosion test or the computer simulation calculation, so that the feasibility verification of exact explosion impact force data and design schemes cannot be provided for the explosion-proof structure design of the middle joint of the high-voltage cable with the explosion-proof shell.
In view of the foregoing, there is a need for a method and system for impact explosion detection for cable joints.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method and a system for detecting the explosion of a cable joint, which are used for simulating a fault line with impulse voltage through an impulse simulation power supply and a power frequency power supply and monitoring the explosion impact force of an explosion-proof shell through a piezoelectric sensor.
The invention adopts the following technical scheme.
The first aspect of the invention relates to a method for detecting impact explosion of a cable joint, comprising the following steps: simultaneously connecting an impact simulation power supply and a power frequency power supply to two sides of a cable joint to simulate a fault line with impact voltage, and assembling an explosion-proof shell outside the cable joint; feeding back the working state of the cable connector by using a voltage sensor and a current sensor, and adjusting the output parameters of the impact simulation power supply based on the working state; the explosion impact force of the explosion-proof housing is monitored by a piezoelectric sensor.
Preferably, the impulse analog power supply is a pulse voltage source with controllable signal intensity and adjustable time parameter; the power frequency power supply is a power frequency current source with controllable signal intensity.
Preferably, the impact simulation power supply comprises a first adjustable high-voltage charging unit DC1, an energy storage capacitor C11, a discharging switch G11 and a voltage stabilizing unit; the first adjustable high-voltage charging unit DC1 is connected in parallel with two sides of the energy storage capacitor C11 through a resistor RC 1; the energy storage capacitor C11 discharges to the voltage stabilizing unit through the discharging switch G1, and the voltage stabilizing unit is connected to two sides of the cable joint in parallel.
Preferably, the power frequency power supply comprises a second adjustable high-voltage charging unit DC2, an energy storage capacitor C2, a discharging switch G2 and a steady-flow capacitor L; the second adjustable high-voltage charging unit DC2 is connected in parallel with the two sides of the energy storage capacitor C2 through a resistor RC 2; the energy storage capacitor C2 is connected in parallel to the two sides of the cable joint through the discharging switch G2 and the steady-flow capacitor L.
Preferably, the energy storage capacitor C2 is connected to two sides of the cable connector in parallel through the discharging switch G2 and the stabilizing capacitor L, and further includes: the energy storage capacitor C2, the discharge switch G2, the steady-flow capacitor L and the loop where the cable joint is located are also sleeved with a current sensor.
Preferably, the impact simulation power supply and the power frequency power supply are simultaneously connected to two sides of the cable joint, and the cable joint further comprises: two sides of the cable joint respectively form an injection end and a reflux end, and one sides of the injection end and the reflux end are positioned in the explosion-proof shell; the other sides of the injection end and the reflux end are respectively fixed with a metal connecting plate, and an impact simulation power supply, a power frequency power supply and a voltage sensor are connected in parallel at two sides of the cable joint through the metal connecting plates.
Preferably, the cable joint and the piezoelectric sensor are arranged on an explosion detection test platform; and moreover, the cable connector is provided with an impact explosive force detection end, and the impact explosive force detection end penetrates through the shielding shell through the transmission rod to be in contact connection with the piezoelectric sensor.
Preferably, the breakdown voltage of the cable joint is tested in advance, and the rated voltage of the impact simulation power supply is set above the breakdown voltage; the voltage regulation range of the adjustable high-voltage charging unit DC1 is 30% to 100% of the rated voltage of the impulse analog power supply.
Preferably, the high voltage charging unit DC1 is adjustable for simulating a lightning impulse voltage waveform of 1.2V/50 μs and a power equipment operation impulse voltage waveform of 250V/2500 μs.
Preferably, the voltage and current sensor is used for feeding back the working state of the cable joint, and adjusting the output parameter of the impact simulation power supply based on the working state, and the method further comprises the following steps: the energy storage capacitor C11 and the energy storage capacitor C2 are respectively charged through a first adjustable high-voltage charging unit DC1 and a second adjustable high-voltage charging unit DC 2; and measuring the voltages of the energy storage capacitor C11 and the energy storage capacitor C2, and controlling the on-off states of the discharge switch G11 and the discharge switch G2 through discharge pulses when the energy storage capacitor C11 and the energy storage capacitor C2 reach preset voltages so as to realize the output of impulse analog voltage and power frequency current.
Preferably, output of impulse analog voltage and power frequency current is realized, and the method further comprises: presetting a voltage stage of the first adjustable high-voltage charging unit DC 1; on an initial stage, output of impulse analog voltage and power frequency current is realized, and working states of the cable connectors fed back by the voltage and current sensors are collected; if the working state is that the cable connector is normally conducted, the voltage stage is increased, impulse analog voltage and power frequency current are continuously output on the increased voltage stage, and the working state is collected until the working state is that the cable connector breaks down; and recording a critical voltage value when the cable connector breaks down.
Preferably, the explosion impact force of the explosion-proof housing is monitored by a piezoelectric sensor, and the method further comprises: after the cable joint breaks down, gradually increasing the power frequency current amplitude of the second adjustable high-voltage charging unit DC2, and recording the impact force recorded by the piezoelectric sensor; and drawing a trend curve based on the power frequency current amplitude and the impact force, and extracting explosion critical current and explosion critical impact force when the cable joint explodes.
The second aspect of the invention relates to an impact explosion detection device for a cable joint by using the method in the first aspect of the invention, wherein the device comprises an impact simulation power supply, a power frequency power supply, a cable joint provided with an explosion-proof shell, a voltage and current sensor, a piezoelectric sensor and a computer control and data acquisition, analysis and processing unit; the impulse simulation power supply and the power frequency power supply are used for being connected to two sides of the cable joint to simulate a fault line with impulse voltage; the voltage and current sensor is used for feeding back the working state of the cable joint; the piezoelectric sensor is used for monitoring the explosion impact force of the explosion-proof shell; the computer control and data acquisition analysis processing unit is used for receiving the feedback of the voltage and current sensors, adjusting the output parameters of the impact simulation power supply based on the fed back working state, and acquiring the explosion impact force and explosion limit parameters.
Compared with the prior art, the impact explosion detection method and system for the cable joint have the beneficial effects that the impact explosion detection method and system for the cable joint simulate a fault line with impact voltage through an impact simulation power supply and a power frequency power supply, and monitor the explosion impact force of the explosion-proof shell through the piezoelectric sensor. The invention accurately simulates the rules and limit parameters between the impact force born by the high-voltage cable insulating shell under the combined action of lightning impact, adjustable impact voltage and power frequency current of the high-voltage cable intermediate joint, and provides support for the material selection and structural design of the high-voltage intermediate joint explosion-proof shell.
The beneficial effects of the invention also include:
1. According to the design test scheme of the actual running environment of the high-voltage cable intermediate joint with the explosion-proof shell, the situation that the high-voltage cable intermediate joint with the explosion-proof shell bears power frequency overcurrent, overvoltage or direct-current overvoltage is fully considered, the scene that the high-voltage cable intermediate joint bears lightning overvoltage and lightning surge voltage of the natural environment of the atmosphere is considered, and the situation that switching equipment (such as a breaker and the like) in a power transmission line is frequently switched on and off to generate operation overvoltage is examined. The simulation scheme integrates the scenes, and ensures the consistency of the explosion initiation reasons and conditions of the explosion test and the actual high-voltage cable intermediate joint.
2. The impulse voltage time parameter of the impulse simulation power supply can cover the wave front time and duration of the lightning impulse voltage wave and the operation impulse voltage wave of the power equipment, and ensure that the test can obtain the combined voltage of the high-voltage cable intermediate connector with the explosion-proof shell under the conditions of lightning impulse, adjustable impulse voltage and power frequency current.
3. The internal relation between the impact force born by the insulating shell of the middle joint of the high-voltage cable with the explosion-proof shell and the amplitude of the injected power frequency current is obtained through accurate simulation, and the technical blank in the field is filled.
4. The method reduces the whole explosion process, firstly simulates the breakdown arc, and secondly provides sufficient power frequency current on the basis of the breakdown arc, thereby accurately simulating the whole fault process of the cable joint before explosion, ensuring traceability of the explosion cause, charging the impact force of the cable joint and the destructive power of the breakdown arc in each time period before explosion, and being applicable to the design, detection and improvement of various cable joints and explosion-proof shells, the experimental data has high test practicability and high result confidence.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a method for detecting an impact explosion of a cable joint according to the present invention;
FIG. 2 is a schematic diagram of a power supply access mode in an impact explosion detection method for a cable joint according to the present invention;
FIG. 3 is a schematic view showing the construction of a voltage source used in the impact explosion detection method of the cable joint according to the present invention;
FIG. 4 is a schematic view showing the construction of a current source used in the impact explosion detection method of the cable joint according to the present invention;
FIG. 5 is a schematic view showing the construction of a piezoelectric transducer connected to a cable joint in an impact explosion detection method for a cable joint according to the present invention;
FIG. 6 is a schematic flow chart of a method for detecting a cable connector explosion by breakdown according to the present invention;
FIG. 7 is a schematic diagram of a process for carrying out an explosion in an impact explosion detection method for a cable joint according to the present invention;
Reference numerals:
1 an impulse analog power supply, 1-1 a first adjustable high-voltage charging unit, 1-2 a first direct-current voltage divider and 1-3 a voltage generating unit;
2 power frequency power supply, 2-1 second adjustable high voltage charging unit, 2-2 second direct current voltage divider and 2-3 current generating unit;
3 cable connector, 3-1 injection end, 3-2 reflux end;
a4 voltage sensor, a 5 current sensor and a6 piezoelectric sensor;
the system comprises a computer control and data acquisition analysis processing unit, a 7-1 control unit, a 7-2 oscilloscope and a 7-3 computer;
8-1, 8-2 injection end metal connection plates, 9-1, 9-2 return end metal connection plates, 10 transfer bars.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments of the invention are only some, but not all, embodiments of the invention. All other embodiments of the invention not described herein, which are obtained from the embodiments described herein, should be within the scope of the invention by those of ordinary skill in the art without undue effort based on the spirit of the present invention.
Fig. 1 is a schematic diagram of an embodiment of an impact explosion detection method for a cable joint according to the present invention. As shown in fig. 1, the first aspect of the present invention relates to an impact explosion detection method for a cable joint, the method comprising steps 1 to 3.
And step 1, connecting an impact simulation power supply and a power frequency power supply to two sides of the cable joint simultaneously to simulate a fault line with impact voltage, and assembling an explosion-proof shell outside the cable joint.
In order to simulate the impact explosion scene of the cable joint, the invention provides a measuring method and a testing device based on the combined action of the impact voltage and the power frequency current with adjustable time parameters. The power frequency current power supply with controllable intensity comprises an impact analog power supply with controllable intensity and adjustable time parameters.
Preferably, the impulse analog power supply is a pulse voltage source with controllable signal intensity and adjustable time parameter; the power frequency power supply is a power frequency current source with controllable signal intensity.
Fig. 3 is a schematic view showing the construction of a voltage source in an impact explosion detection method for a cable joint according to the present invention. As shown in fig. 1 and 3, the impulse simulation power supply comprises a first adjustable high-voltage charging unit DC1, a current-limiting resistor RC1 and a lightning impulse voltage generating unit (1-3) unit, wherein the lightning impulse voltage generating unit comprises an energy storage capacitor C11, a discharge switch G11, forming resistors RF1 and RT1 thereof and a forming capacitor C12; the first adjustable high-voltage charging unit DC1 is connected in parallel with two sides of the energy storage capacitor C11 of the lightning impulse voltage generating unit through a current limiting resistor RC 1; the energy storage capacitor C11 is discharged through the discharge switch G1 and the formation resistors RF1, RT1 and the formation capacitor C12, and the lightning impulse voltage generating unit is connected in parallel to both sides of the cable joint.
The adjustable high-voltage charging unit DC1 comprises a high-voltage direct-current charging power supply (1-1) and a current-limiting protection resistor RC1, and charging voltages at two ends of an energy storage capacitor C11 in the lightning impulse voltage generating unit are measured by a direct-current voltage divider (1-2); .
In the working process, the first adjustable high-voltage charging unit DC1 is an adjustable high-voltage direct-current charging power supply, and charges the energy storage capacitor element C11 in the voltage generation loop after outputting voltage, and outputs a shock voltage wave with adjustable amplitude and adjustable time parameter so as to meet the test requirements of different levels of high-voltage cable joints.
Preferably, the high voltage charging unit DC1 is adjustable for simulating a lightning impulse voltage waveform of 1.2V/50 μs and a power equipment operation impulse voltage waveform of 250V/2500 μs.
To simulate the above environment, the parameters of the components in the power supply should satisfy:
3.24×RF1×C12＝1.2(±30％)
0.69×[RT1×C12+(RF1+RT1)×C11]＝50(±20％)
C11>>C12
In the above formula, the resistors RF1 and RT1 have the unit Ω and the capacitors C11 and C12 have the unit μf.
Preferably, the breakdown voltage of the cable joint is tested in advance, and the rated voltage of the impact simulation power supply is set above the breakdown voltage; the voltage regulation range of the adjustable high-voltage charging unit DC1 is 30% to 100% of the rated voltage of the impulse analog power supply.
The output voltage of the impact power supply should be greater than the breakdown voltage of the cable joint during testing, and in one embodiment, the maximum value of the output voltage can be set to be between 1.3 and 2 times the breakdown voltage. In addition, the voltage amplitude is adjustable to ensure that the test can be implemented.
The time parameter and duration of the impulse voltage waveform are adjustable, the optimal rising time and duration of the impulse voltage waveform can be obtained through a combined test with a power frequency current power supply, and the criterion of the optimal time parameter is that after the impulse voltage pulse is applied, a stable power frequency current arc can be formed subsequently. The output current of the power frequency current power supply can be adjusted through the discharge voltage of the oscillation loop after the parameters of the voltage source are determined.
Fig. 4 is a schematic view showing the construction of a current source used in the impact explosion detection method of the cable joint according to the present invention. As shown in fig. 4, preferably, the power frequency power supply includes a second adjustable high-voltage charging unit DC2, an energy storage capacitor C2, a discharging switch G2, and a steady-flow capacitor L; the second adjustable high-voltage charging unit DC2 is connected in parallel with the two sides of the energy storage capacitor C2 through a resistor RC 2; the energy storage capacitor C2 is connected in parallel to the two sides of the cable joint through the discharging switch G2 and the steady-flow capacitor L.
With the above arrangement, the time parameters of the output impulse voltage waveform can cover the wave front time and half-peak time parameter ranges of the output voltage waveform of the lightning impulse voltage power supply of 1.2/50 mu s and the operation impulse voltage waveform of 250/2500 mu s.
The resistor RC2 is a charging current-limiting resistor, the energy storage capacitor C2 and the inductor L work in a resonance state, and the resonance frequency is 50-60Hz.
In the working process, the output voltage of the adjustable high-voltage direct-current charging power supply DC2 is continuously adjusted to charge the energy storage capacitor element C2 in the power frequency current generation loop, and the power frequency current with the amplitude and the frequency of 50-60Hz is output, so that the explosion impact force test requirements of different levels of high-voltage cable joints are met.
The parameters of the power frequency current generation loop are controlled to be that the parameters of the power frequency current generation loop with the frequency of 50-60Hz are satisfied:
In order to achieve the highest possible output efficiency of the tank circuit shown in fig. 4, the circuit impedance can be as low as possible, i.e. Can be selected between 10-50mΩ. In one embodiment, the output power frequency current amplitude is ensured to be between 1 and 5kA under a certain value of the discharge voltage of the power frequency current power supply.
Fig. 2 is a schematic diagram of a power supply access mode in an impact explosion detection method for a cable joint according to the present invention. As shown in fig. 2, preferably, the impact simulation power supply and the power frequency power supply are simultaneously connected to two sides of the cable joint, and the method further includes: two sides of the cable joint respectively form an injection end and a reflux end, and one sides of the injection end and the reflux end are positioned in the explosion-proof shell; the other sides of the injection end and the reflux end are respectively fixed with a metal connecting plate, and an impact simulation power supply, a power frequency power supply and a voltage sensor are connected in parallel at two sides of the cable joint through the metal connecting plates.
The impact simulation power supply with adjustable controllable intensity and time parameter and the power frequency current power supply with controllable intensity are connected in parallel with the core wire of the tested high-voltage cable middle joint with the explosion-proof shell and the two ends of the outer shielding layer/grounding wire. Specifically, the high-voltage output end of the impact simulation power supply and the power frequency current power supply is connected with the core wire of the tested cable joint (namely the injection end) through the metal connecting plate, and the low-voltage output end is also connected with the outer shielding layer of the tested middle joint of the high-voltage cable with the explosion-proof shell (namely the reflux end) through the metal connecting plate.
The core and the high-voltage shield/ground layer of the intermediate connector of the high-voltage cable with the explosion-proof housing to be tested are mounted on the insulating housing of the cable connector, and the structure of the connector, which is connected with the core and the outer shield of the cable, is led to the insulating housing in the manner of a cable or a copper conductor. The high voltage shield/ground layer may be a high voltage shield or an insulating shield of the cable.
The method is characterized in that the high-voltage end and the low-voltage end of a lightning impulse voltage power supply and a power frequency current power supply with controllable intensity are respectively connected through bolted electric connection terminals, such as a metal connection plate.
Fig. 5 is a schematic view showing the construction of a piezoelectric sensor connected cable joint in the impact explosion detection method for cable joint according to the present invention. As shown in fig. 5, preferably, the cable connector and the piezoelectric sensor are fixedly mounted on the explosion detection test platform; and moreover, the cable connector is provided with an impact explosive force detection end, and the impact explosive force detection end penetrates through the shielding shell through the transmission rod to be in contact connection with the piezoelectric sensor.
The piezoelectric sensor is closely contacted with the insulating shell through a cylindrical transmission rod, and the lower end face of the cylindrical transmission rod is closely contacted with the surface of the piezoelectric sensor.
Preferably, the energy storage capacitor C2 is connected to two sides of the cable connector in parallel through the discharging switch G2 and the stabilizing capacitor L, and further includes: the energy storage capacitor C2, the discharge switch G2, the steady-flow capacitor L and the loop where the cable joint is located are also sleeved with the current sensor.
In addition, the voltage and current sensor and the recording device such as oscilloscope connected with the voltage and current sensor are also connected to the corresponding access system. The voltage sensor is connected in parallel with the two ends of the core wire and the shielding layer/grounding layer of the middle joint of the high-voltage cable with the explosion-proof shell and is used for measuring the output voltage of the middle joint of the high-voltage cable. And a power frequency current sensor is sleeved on an electric connecting wire between the high-voltage cable intermediate connector and the reflux end of the power supply and used for recording the power frequency follow-up arc current injected after the insulation breakdown of the high-voltage cable intermediate connector with the explosion-proof shell.
Fig. 6 is a schematic flow chart of breakdown implementation in an impact explosion detection method for a cable joint according to the present invention. As shown in fig. 6, preferably, the voltage and current sensors are used to feed back the working state of the cable connector, and the output parameters of the impact simulation power supply are adjusted based on the working state, and the method further comprises: charging the energy storage capacitor C11 and the energy storage capacitor C2 respectively through a first adjustable high-voltage charging unit DC1 and a second adjustable high-voltage charging unit DC 2; and measuring the voltages of the energy storage capacitor C11 and the energy storage capacitor C2, and controlling the on-off states of the discharge switch G11 and the discharge switch G2 through discharge pulses when the energy storage capacitor C11 and the energy storage capacitor C2 reach preset voltages so as to realize the output of impulse analog voltage and power frequency current.
The computer control and data acquisition analysis processing unit is used for monitoring and controlling the test process, detecting, recording and processing the output voltage and the output current and the explosion impact force detected by the explosion impact force detecting device.
The computer control and data management unit controls the combined impact discharge of the voltage source and the current source. In addition, the power frequency current parameters and the impact force formed by the power frequency arc, which act on the middle joint of the high-voltage cable with the explosion-proof housing, are respectively extracted by the current sensor, the voltage sensor and the piezoelectric sensor and then are sent to the computer measurement and control and data management unit, and the rule between the impact force of the arc born by the middle joint of the high-voltage cable with the explosion-proof housing and the power frequency current parameters flowing through the middle joint of the high-voltage cable with the explosion-proof housing is obtained through processing and analysis.
And 2, feeding back the working state of the cable connector by using a voltage and current sensor, and adjusting the output parameters of the impact simulation power supply based on the working state.
As shown in fig. 6, in order to obtain a breakdown arc, the method controls the impulse voltage parameters output by the impulse voltage power supply with controllable intensity and adjustable time parameters through a computer control and data acquisition, analysis and processing unit.
Preferably, output of impulse analog voltage and power frequency current is realized, and the method further comprises: presetting a voltage stage of a first adjustable high-voltage charging unit DC 1; on the initial stage, output of impulse analog voltage and power frequency current is realized, and working states of the cable connectors fed back by voltage and current sensors are collected; if the working state is that the cable connector is normally conducted, the voltage stage is increased, impulse analog voltage and power frequency current are continuously output on the increased voltage stage, and the working state is collected until the working state is that the cable connector breaks down; and recording a critical voltage value when the cable connector breaks down.
The method comprises the steps of setting a discharge voltage value of a surge voltage power supply with controllable strength and time parameters on a computer human-computer interactive display interface of a computer control and data processing analysis processing unit, wherein the discharge voltage value is at least greater than a critical surge voltage breakdown amplitude of an explosion-proof shell injection end of a middle joint of a tested high-voltage cable obtained through an experimental method. The high-voltage cable middle connector can be ensured to be broken down between the injection end and the reflux end, and the power frequency current arc can be reliably initiated.
In particular, if the breakdown voltage value of the cable joint is known, it can be directly input. If not known, the charge voltage, waveform forming resistance and load capacitance parameters of the storage capacitor C11 can be adjusted by a computer, for example.
And gradually increasing the discharge voltage of the impulse voltage power supply with adjustable time parameter until the time parameter and the amplitude parameter of the impulse voltage waveform can stably trigger the subsequent power frequency current value, wherein the peak value of the impulse voltage corresponding to the condition is defined as the critical impulse voltage breakdown of the middle joint of the tested high-voltage cable.
The amplitude of the output voltage of the adjustable high-voltage direct-current charging power supply can also realize the regulation and control of the computer on the output voltage of the high-voltage direct-current charging power supply in a communication mode, so that the discharge voltage of the power frequency current power supply is gradually increased according to the test requirements of lightning impulse voltage output with different amplitudes, a group of power frequency current output values corresponding to the discharge voltage can be obtained, and the method can record the rule and realize analysis.
The amplitude of the output voltage of the adjustable high-voltage direct-current charging power supply can also be regulated and controlled by a computer in a communication mode, so that the test requirements of different power frequency current outputs are met.
And 3, monitoring the explosion impact force of the explosion-proof shell through a piezoelectric sensor.
Fig. 7 is a schematic flow chart of an explosion implementation in an impact explosion detection method for a cable joint according to the present invention. As shown in fig. 7, preferably, the explosion impact force of the explosion-proof housing is monitored by a piezoelectric sensor, further comprising: after the cable joint breaks down, gradually increasing the power frequency current amplitude of the second adjustable high-voltage charging unit DC2, and recording the impact force recorded by the piezoelectric sensor; and drawing a trend curve based on the amplitude of the power frequency current and the impact force, and extracting explosion critical current and explosion critical impact force when the cable joint explodes.
When the breakdown discharge of the injection end and the reflux end of the middle joint of the high-voltage cable under the action of the impact voltage with adjustable time parameters is ensured, the stable breakdown discharge between the injection end and the reflux end is ensured, and the output current of the power frequency current power supply with controllable intensity is controlled by the control unit.
The computer control and data processing and analyzing unit obtains signals from the voltage sensor, the current sensor and the piezoelectric sensor through a communication interface of the oscilloscope, processes and analyzes the received signals to obtain an array of impact force and power frequency current intensity born by the explosion-proof shell of the middle joint of the high-voltage cable, and the limit threshold value of the impact force born by the explosion-proof shell of the middle joint of the high-voltage cable can be obtained through the analysis processing of the computer control and data processing and analyzing unit.
Specifically, the computer control and data acquisition analysis processing unit adjusts the amplitude of the power frequency current output by the controllable power frequency current power supply, detects the corresponding explosion impact force which is generated on the bottom surface of the insulating shell of the middle joint of the high-voltage cable with the explosion-proof shell and is measured by the explosion impact force detection device, and forms a group of power frequency current amplitude and impact force which acts on the bottom panel of the insulating shell of the middle joint of the high-voltage cable with the explosion-proof shell. And gradually increasing the amplitude of the power frequency current output by the controllable power frequency current power supply, and finally obtaining the critical explosion impact force of the tested high-voltage cable middle joint insulating shell material with the explosion-proof shell.
In addition, the data extracted and collected by the oscilloscope are processed and analyzed, and the relation rule between the explosion impact force born by the explosion-proof shell of the middle joint of the high-voltage cable and the power frequency current amplitude is obtained.
The second aspect of the invention relates to an impact explosion detection device for a cable joint by utilizing the method of the first aspect of the invention, wherein the device comprises an impact simulation power supply, a power frequency power supply, a cable joint provided with an explosion-proof shell, a voltage and current sensor, a piezoelectric sensor and a computer control and data acquisition, analysis and processing unit; the impulse simulation power supply and the power frequency power supply are used for being connected to two sides of the cable joint to simulate a fault line with impulse voltage; the voltage and current sensor is used for feeding back the working state of the cable joint; the piezoelectric sensor is used for monitoring the explosion impact force of the explosion-proof shell; the computer control and data acquisition analysis processing unit is used for receiving the feedback of the voltage and current sensors, adjusting the output parameters of the impact simulation power supply based on the fed back working state, and acquiring the explosion impact force and explosion limit parameters.
The impulse voltage output by the voltage power supply with adjustable controllable intensity and time parameter and the power frequency current output by the controllable power frequency current power supply are controlled by an industrial control computer through a programmable controller. The impulse voltage and the power frequency current are sampled by a voltage sensor and a current sensor detection unit, the impulse force acting on the insulating shell of the middle joint of the high-voltage cable with the explosion-proof shell is sampled by a piezoelectric sensor, the sampling signal of the sensor is transmitted to a computer control and data acquisition analysis processing unit after being acquired and recorded by an oscilloscope, and the relation rule between the impulse force born by the insulating shell of the middle joint of the high-voltage cable with the explosion-proof shell and the injected power frequency current amplitude is obtained.
In one embodiment, the method supports the regular deployment of a plurality of flexible piezoelectric ultrasonic sensors in an array on the surface of the cable joint and ensures that the plurality of flexible piezoelectric ultrasonic sensors are located inside an explosion proof enclosure outside the cable joint. Collecting a plurality of piezoelectric ultrasonic signals of the plurality of flexible piezoelectric ultrasonic sensors, monitoring and analyzing the partial discharge state of the cable joint based on the plurality of piezoelectric ultrasonic signals, and judging breakdown arc according to the partial discharge state.
The control module inside the explosion-proof housing and the special data box outside the explosion-proof housing are also used for realizing local or remote data noise reduction and data analysis. The data noise reduction adopts one or more of pre-amplification, band-pass filtering and buffer amplification modes to realize the noise reduction of the piezoelectric ultrasonic signals acquired by the plurality of flexible piezoelectric ultrasonic sensors. Judging whether the amplitude of any one of the piezoelectric ultrasonic signals exceeds a partial discharge threshold, and if so, judging that the cable joint is subjected to partial discharge.
Associating a position of each sensor of the plurality of flexible piezoelectric ultrasonic sensors with a piezoelectric ultrasonic signal to determine a partial discharge position when partial discharge is detected to occur; and the signal amplitude and the discharge quantity of the piezoelectric ultrasonic signals in the cable joints of different types are associated, so that the discharge quantity is estimated when the occurrence of partial discharge is detected.
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, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (13)
1. A method for detecting an impact explosion of a cable joint, the method comprising the steps of:
Simultaneously connecting an impact simulation power supply and a power frequency power supply to two sides of the cable joint to simulate a fault line with impact voltage, and assembling an explosion-proof shell outside the cable joint;
feeding back the working state of the cable connector by using a voltage and current sensor, and adjusting the output parameters of the impact simulation power supply based on the working state;
The explosion impact force of the explosion-proof housing is monitored by a piezoelectric sensor.
2. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
the impact simulation power supply is a pulse voltage source with controllable signal intensity and adjustable time parameters;
the power frequency power supply is a power frequency current source with controllable signal intensity.
3. A method for impact explosion detection for a cable joint according to claim 2, wherein:
The impact simulation power supply comprises a first adjustable high-voltage charging unit DC1, an energy storage capacitor C11, a discharging switch G11 and a voltage stabilizing unit; wherein,
The first adjustable high-voltage charging unit DC1 is connected in parallel with two sides of the energy storage capacitor C11 through a resistor RC 1;
the energy storage capacitor C11 discharges to the voltage stabilizing unit through the discharge switch G1, and the voltage stabilizing unit is connected to two sides of the cable joint in parallel.
4. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
the power frequency power supply comprises a second adjustable high-voltage charging unit DC2, an energy storage capacitor C2, a discharging switch G2 and a steady-flow capacitor L; wherein,
The second adjustable high-voltage charging unit DC2 is connected in parallel with the two sides of the energy storage capacitor C2 through a resistor RC 2;
The energy storage capacitor C2 is connected in parallel to two sides of the cable connector through the discharging switch G2 and the steady-flow capacitor L.
5. A method for impact explosion detection for a cable joint according to claim 4, wherein:
The energy storage capacitor C2 is connected to two sides of the cable joint in parallel through the discharging switch G2 and the steady-flow capacitor L, and the energy storage capacitor C further comprises:
The energy storage capacitor C2, the discharge switch G2, the steady-flow capacitor L and the loop where the cable joint is located are also sleeved with the current sensor.
6. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
The impact simulation power supply and the power frequency power supply are simultaneously connected to two sides of the cable joint, and the cable joint further comprises:
Two sides of the cable joint respectively form an injection end and a reflux end, and one sides of the injection end and the reflux end are positioned in the explosion-proof shell;
the other sides of the injection end and the reflux end are respectively fixed with a metal connecting plate, and the impact simulation power supply, the power frequency power supply and the voltage sensor are connected in parallel at two sides of the cable joint through the metal connecting plates.
7. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
The cable connector and the piezoelectric sensor are arranged on an explosion detection test platform; and
The cable connector is provided with an impact explosive force detection end, and the impact explosive force detection end penetrates through the shielding shell through the transmission rod to be in contact connection with the piezoelectric sensor.
8. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
Testing the breakdown voltage of the cable joint in advance, and setting the rated voltage of the impact simulation power supply above the breakdown voltage;
the voltage regulation range of the adjustable high-voltage charging unit DC1 is 30% to 100% of the rated voltage of the impulse simulation power supply.
9. A method for impact explosion detection for a cable joint according to claim 8, wherein:
The adjustable high-voltage charging unit DC1 is used for simulating a lightning impulse voltage waveform of 1.2V/50 mu s and an electric equipment operation impulse voltage waveform of 250V/2500 mu s.
10. A method of detecting an impact explosion for a cable joint according to claim 1, wherein:
The said utilization voltage, current sensor feedback the working condition of the said cable joint, and adjust the output parameter of the said impact simulation power based on the said working condition, further include:
The energy storage capacitor C11 and the energy storage capacitor C2 are respectively charged through a first adjustable high-voltage charging unit DC1 and a second adjustable high-voltage charging unit DC 2;
And measuring the voltages of the energy storage capacitor C11 and the energy storage capacitor C2, and controlling the on-off states of the discharge switch G11 and the discharge switch G2 through discharge pulses when the energy storage capacitor C11 and the energy storage capacitor C2 reach preset voltages so as to realize the output of impulse analog voltage and power frequency current.
11. A method of detecting an impact explosion for a cable joint according to claim 10, wherein:
the output of realization impact analog voltage, power frequency current still includes:
Presetting a voltage stage of the first adjustable high-voltage charging unit DC 1;
On an initial stage, output of impulse analog voltage and power frequency current is realized, and working states of the cable connectors fed back by the voltage and current sensors are collected;
If the working state is that the cable connector is normally conducted, the voltage stage is increased, impulse analog voltage and power frequency current are continuously output on the increased voltage stage, and the working state is collected until the working state is that the cable connector breaks down;
And recording a critical voltage value when the cable connector breaks down.
12. A method for impact explosion detection for a cable joint according to claim 11, wherein:
the explosion impact force of explosion-proof shell is monitored through piezoelectric sensor, still includes:
After the cable joint breaks down, gradually increasing the power frequency current amplitude of the second adjustable high-voltage charging unit DC2, and recording the impact force recorded by the piezoelectric sensor;
And drawing a trend curve based on the power frequency current amplitude and the impact force, and extracting explosion critical current and explosion critical impact force when the cable joint explodes.
13. An impact explosion detection device for a cable joint using the method of any one of claims 1-12, characterized in that:
The device comprises an impact simulation power supply, a power frequency power supply, a cable joint provided with an explosion-proof shell, a voltage and current sensor, a piezoelectric sensor and a computer control and data acquisition, analysis and processing unit;
the impact simulation power supply and the power frequency power supply are used for being connected to two sides of the cable joint to simulate a fault line with impact voltage;
The voltage and current sensor is used for feeding back the working state of the cable joint;
The piezoelectric sensor is used for monitoring the explosion impact force of the explosion-proof shell;
and the computer control and data acquisition analysis processing unit is used for receiving the feedback of the voltage and current sensors, adjusting the output parameters of the impact simulation power supply based on the fed back working state, and acquiring the explosion impact force and explosion limit parameters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311628232.7A CN118010279A (en) | 2023-11-30 | 2023-11-30 | Impact explosion detection method and system for cable joint |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311628232.7A CN118010279A (en) | 2023-11-30 | 2023-11-30 | Impact explosion detection method and system for cable joint |
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