CN113607351A - Cable tightness testing device, method, computer equipment and storage medium - Google Patents
Cable tightness testing device, method, computer equipment and storage medium Download PDFInfo
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- CN113607351A CN113607351A CN202110769112.3A CN202110769112A CN113607351A CN 113607351 A CN113607351 A CN 113607351A CN 202110769112 A CN202110769112 A CN 202110769112A CN 113607351 A CN113607351 A CN 113607351A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2838—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for cables
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Abstract
The application relates to a cable tightness testing device, a cable tightness testing method, computer equipment and a storage medium. The device comprises a first sealing interface and a second sealing interface; the first sealing interface comprises an inflation hole; the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested; and inflating the cable to be tested through the inflation hole until the inside of the cable to be tested reaches a constant pressure state, acquiring a first pressure inside the cable to be tested in the constant pressure state, acquiring a second pressure inside the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure. In the method, the sealing interfaces are arranged at the two ends of the cable to be tested, the sealing performance of the cable to be tested is detected by adopting an internal pressure type detection principle, and compared with methods such as a water penetration test and the like, the method has the characteristics of low consumption, high precision, short time, simplicity in operation and the like.
Description
Technical Field
The present application relates to the field of power technologies, and in particular, to a cable tightness testing apparatus, a cable tightness testing method, a computer device, and a storage medium.
Background
The cable is affected by complex factors such as mechanical stress, temperature field, electric field, moisture and the like in the operation process, so that the cable is affected by moisture to form defects, and serious cable faults and huge economic losses are caused.
In the prior art, the overall water blocking performance of the cable is generally tested and evaluated by a water penetration test method. However, the internal structure of the cable is complex, and the cable accessory has a more complex structure and more interfaces between layers than the cable body, and the cable accessory can more easily receive and store moisture or humidity, resulting in defects and failures such as metal corrosion, insulation deterioration, interface creepage, and the like.
The water permeability test method has the advantages of non-recoverability, lack of pertinence to the accessory structure of the cable, and inaccurate test result of the water resistance performance of the obtained cable.
Disclosure of Invention
In view of the above, it is desirable to provide a cable tightness testing apparatus, a method, a computer device, and a storage medium capable of accurately obtaining the water blocking performance of a cable.
In a first aspect, a cable tightness testing device is provided, which comprises a first sealing interface and a second sealing interface; the first sealing interface comprises an inflation hole;
the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested;
the cable tightness testing device is used for inflating the cable to be tested through the inflation hole until the interior of the cable to be tested reaches a constant pressure state, acquiring a first pressure intensity in the cable to be tested in the constant pressure state, acquiring a second pressure intensity in the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure intensity and the second pressure intensity.
In a second aspect, a cable tightness testing method is provided, which is applied to the cable tightness testing device provided in the first aspect; the method comprises the following steps:
acquiring a first pressure when the interior of a cable to be tested reaches a constant pressure state;
after a preset time period, acquiring a second pressure intensity inside the cable to be measured;
and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
In one optional embodiment, determining the sealing performance of the cable based on the first pressure and the second pressure comprises:
and calculating the gas mass leakage rate of the cable to be measured according to the first pressure intensity and the second pressure intensity.
In one optional embodiment, calculating the gas mass leakage rate of the cable to be tested according to the first pressure and the second pressure comprises:
acquiring the internal volume of the cable to be tested and the gas temperature inside the cable to be tested;
calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure;
and calculating the gas mass leakage rate of the cable to be measured according to the pressure difference, the internal volume, the gas temperature, the duration of a preset time period, the gas molar mass and the gas constant.
In one optional embodiment, determining the sealing performance of the cable to be tested according to the first pressure and the second pressure comprises:
and calculating the internal volume difference of the cable to be measured according to the first pressure intensity and the second pressure intensity.
In one optional embodiment, calculating the difference of the internal volumes of the cables to be measured according to the first pressure and the second pressure comprises:
calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure;
acquiring the internal volume of a cable to be tested;
and calculating the internal volume difference of the cable to be measured according to the pressure difference, the internal volume, the duration of the preset time period and the standard atmospheric pressure.
In one optional embodiment, the method further comprises:
inflating the cable to be tested through an inflation hole of the cable tightness testing device, and acquiring the internal pressure of the cable to be tested according to a preset sampling frequency;
and if the difference value between the internal pressure intensity at the current sampling moment and the internal pressure intensity at the previous sampling moment is smaller than a preset difference threshold value, determining that the inside of the cable to be tested reaches a constant voltage state.
In a third aspect, a cable tightness testing device is provided, which comprises:
the acquisition module is used for acquiring a first pressure when the interior of the cable to be detected reaches a constant pressure state;
the acquisition module is further used for acquiring a second pressure intensity inside the cable to be detected after a preset time period;
and the calculation module is used for determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
In a fourth aspect, there is provided a computer device comprising a memory storing a computer program and a processor implementing the method of any of the second aspects when the processor executes the computer program.
In a fifth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of the second aspects described above.
The cable tightness testing device comprises a first sealing interface and a second sealing interface; the first sealing interface comprises an inflation hole; the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested; and inflating the cable to be tested through the inflation hole until the inside of the cable to be tested reaches a constant pressure state, acquiring a first pressure inside the cable to be tested in the constant pressure state, acquiring a second pressure inside the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure. In the method, the sealing interfaces are arranged at the two ends of the cable to be tested, the sealing performance of the cable to be tested is detected by adopting an internal pressure type detection principle, and compared with methods such as a water penetration test and the like, the method has the characteristics of low consumption, high precision, short time, simplicity in operation and the like. The method provides a detection method and an evaluation index for the sealing performance of the XLPE cable, can be used for network access detection and evaluation of the cable, and has important significance for ensuring the sealing performance of the cable structure and reducing the damp faults of the cable line.
Drawings
FIG. 1 is a schematic structural diagram of a cable tightness testing device according to an embodiment;
FIG. 2 is a schematic flow chart of a cable integrity test method according to one embodiment;
FIG. 3 is a schematic flow chart of a cable integrity test method according to one embodiment;
FIG. 4 is a schematic flow chart of a cable integrity test method according to one embodiment;
FIG. 5 is a schematic flow chart of a cable integrity test method according to one embodiment;
FIG. 6 is a schematic flow chart of a cable integrity test method according to one embodiment;
FIG. 7 is a block diagram of a cable tightness testing device according to an embodiment;
FIG. 8 is a block diagram of a cable tightness testing device according to an embodiment;
FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In an electric power system, a cross-linked polyethylene (XLPE) cable is widely applied by virtue of the advantages of stable insulating property, simple structure and process, small occupied space and the like, and is a neural network of a power transmission and distribution system. In regions with humid and hot climate such as provinces in the south of China, distribution cables are mostly laid in cable trenches, soil direct burial and other modes, and are affected by complex factors such as mechanical stress, temperature fields, electric fields, moisture and moisture in the running process for a long time, so that defects caused by the fact that the distribution cables are affected by water inflow and dampness are very common, and serious cable faults and huge economic losses are caused.
The cable comprises a cable accessory, wherein the cable accessory comprises a cable main insulation layer, an accessory insulation layer, a protective layer and other multilayer structures, compared with a cable body, the cable accessory has a more complex structure and more interlayer interfaces, the interfaces consist of air gaps of a real contact part and a non-contact part of materials, and moisture or humidity easily enters and is stored in the operation process, so that defects and faults such as metal corrosion, insulation degradation, interface creepage and the like are caused. A composite insulation interface formed by main insulation of the cable and accessory insulation runs under a strong electric field parallel component and a strong electric field vertical component, and faults such as interface creepage, interface breakdown and the like are easily caused after moisture enters the composite insulation interface, so that the composite insulation interface is a concentrated part of the faults of the cable accessories.
In order to prevent the cable accessory from being failed due to water inflow of the cable accessory, ensuring the tightness of a composite insulation interface and other structures is an important means for inhibiting the water from entering the composite insulation interface to cause related failures, and how to accurately evaluate the tightness of the cable accessory structure is a key challenge. In the prior art, the water resistance performance of the cable is evaluated by a water penetration test method, but the structure in the cable accessory is lack of pertinence, and the water penetration test method is high in consumption, long in time, difficult to recover and difficult to quantitatively evaluate.
In this embodiment, a cable tightness testing device, a cable tightness testing method, a computer device, and a storage medium based on an air tightness detection principle are provided, which have the outstanding characteristics of low consumption, high precision, short time, simple operation, and the like, and achieve layer-by-layer sealing performance detection of a multilayer structure of a cable accessory, and are of great significance in evaluating the cable accessory tightness and reducing cable line damp faults.
In one embodiment, as shown in fig. 1, a cable hermeticity testing apparatus is provided, the apparatus comprising a first sealing interface 100 and a second sealing interface 200; the first sealing interface 100 includes an inflation port 101 thereon; the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested.
The cable tightness testing device is used for inflating the cable to be tested through the inflation hole until the interior of the cable to be tested reaches a constant pressure state, acquiring a first pressure intensity in the cable to be tested in the constant pressure state, acquiring a second pressure intensity in the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure intensity and the second pressure intensity.
The cable to be tested at least comprises a cable core, an inner shielding layer, an XLPE main insulation and other structures, the cable to be tested in the embodiment is required to be complete and not damaged, as shown in fig. 1, two ends of the cable to be tested are sealed by sealing rings to form a sealing interface, and an inflation hole 101 is formed in a first sealing interface 100 for inflation operation. Optionally, the device for performing inflation may be any sealing detection device, and for example, the sealing detection device may adopt a differential pressure type air tightness detector, which has functions of inflation, balance, pressure real-time monitoring, and the like.
In this embodiment, a cable to be tested in the cable tightness testing device is tested by the sealing detection device, the cable to be tested is rapidly inflated to a constant air pressure in the testing process, and the air pressure value in the sealed cavity is monitored in real time after the inflation is stopped, so that the sealing performance of the cable to be tested can be determined by the computer device based on the air pressure value. Optionally, the sealing detection device may further obtain a gas leakage curve of the cable to be tested in the time domain based on the gas pressure value, so that the computer device may determine a gas leakage speed in a specified time period or a gas leakage speed at a specified time based on the gas leakage curve, thereby determining the sealing performance of the cable to be tested.
Specifically, two sections of XLPE cables to be tested with certain lengths are taken, structures such as an outer protective layer, a shielding layer, a main insulation layer and the like are stripped at one end of each cable to be tested according to a cable joint manufacturing process, and a wire core at one end of each two sections of cables to be tested is exposed; according to the cable joint manufacturing process, two sections of exposed cable cores of the cable to be detected are butted, are crimped through a crimping pipe, are sleeved with cable accessories and are used for detecting the tightness of a composite interface between cable insulation and accessory insulation; customizing a first sealing interface 100 and a second sealing interface 200 according to the radial dimension of a cable to be detected, and arranging the first sealing interface 100 and the second sealing interface at two ends of the cable to be detected, wherein an inflation hole 101 is formed in the first sealing interface 100 and is connected with sealing detection equipment; connecting a cable to be tested with sealing detection equipment, setting an internal air pressure value (mostly 10-100kPa), sequentially carrying out an inflation process, a balance process and a detection process, monitoring the internal pressure of the cable to be tested in real time, and acquiring an internal gas leakage curve of the cable to be tested; and calculating the gas leakage speed at different moments and time periods by the computer equipment according to the gas leakage curve to serve as the sealing performance evaluation index of the cable to be tested. Optionally, if the overall sealing effect of the multi-layer sealing structure of the cable accessory needs to be detected, other structures can be added to the outer layer of the accessory of the cable to be detected, and in this case, the sealing evaluation index reflects the sealing performance of the whole accessory system.
In the embodiment, the sealing performance of the XLPE cable accessory to be detected is detected by adopting an internal pressure type detection principle, wherein the internal pressure type detection means that a detection object is externally sealed in the detection process to form an internal cavity and is inflated or exhausted to a certain air pressure, and the sealing performance is evaluated by monitoring the change of the air pressure of the cavity in real time.
The cable tightness testing device comprises a first sealing interface and a second sealing interface; the first sealing interface comprises an inflation hole; the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested; and inflating the cable to be tested through the inflation hole until the inside of the cable to be tested reaches a constant pressure state, acquiring a first pressure inside the cable to be tested in the constant pressure state, acquiring a second pressure inside the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure. In the method, the sealing interfaces are arranged at the two ends of the cable to be tested, the sealing performance of the cable to be tested is detected by adopting an internal pressure type detection principle, and compared with methods such as a water penetration test and the like, the method has the characteristics of low consumption, high precision, short time, simplicity in operation and the like. The method provides a detection method and an evaluation index for the sealing performance of the XLPE cable, can be used for network access detection and evaluation of the cable, and has important significance for ensuring the sealing performance of the cable structure and reducing the damp faults of the cable line.
The cable tightness testing method provided by the application can be applied to a cable tightness testing device shown in figure 1. The following describes in detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems by embodiments and with reference to the drawings. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. It should be noted that, in the cable tightness testing method provided in the embodiments of fig. 2 to fig. 6 of the present application, an execution main body is a computer device, and may also be a cable tightness testing apparatus, and the cable tightness testing apparatus may be a part or all of the computer device by software, hardware, or a combination of software and hardware. In the following method embodiments, the execution subject is a computer device as an example.
In an embodiment, as shown in fig. 2, a method for testing cable tightness is provided, which relates to a process that a computer device obtains a first pressure when an inside of a cable to be tested reaches a constant pressure state, obtains a second pressure after a preset time period, and determines a sealing performance of the cable to be tested according to the first pressure and the second pressure, and includes the following steps:
s201, obtaining a first pressure when the interior of the cable to be tested reaches a constant pressure state.
The constant pressure state refers to that the gas pressure inside the cable to be tested does not change or changes little within a period of time, for example, the change rate of the gas pressure inside the cable to be tested is smaller than a preset threshold value within a period of time.
In this embodiment, the computer device may obtain the first pressure of the internal air pressure of the cable to be tested in the constant pressure state from the sealing test device. Optionally, the sealing test equipment is configured to inflate the inside of the cable to be tested through the inflation hole of the cable to be tested, and obtain the gas pressure inside the cable to be tested in real time, where the computer equipment may obtain the gas pressure inside the cable to be tested in real time from the sealing test equipment, or obtain a data analysis result generated by the sealing test equipment based on the collected gas pressure inside the cable to be tested, and for example, the data analysis result of the gas pressure inside the cable to be tested may be an internal gas leakage curve of the cable to be tested, and the like. The computer device obtains the gas leakage curve diagram, and obtains the first pressure of the cable to be tested in the constant pressure state based on the gas leakage curve diagram, which is not limited in this embodiment.
S202, after a preset time period, obtaining a second pressure inside the cable to be measured.
The preset time period may be a designated time period, for example, 5 minutes, 10 minutes, 30 minutes, and the like.
In this embodiment, similar to step 201, the computer device may obtain, according to a preset time period, after the preset time period, a second pressure of the gas inside the cable to be tested to the sealing test device; or, based on the gas leakage graph, after a specified time period corresponding to the sampling time corresponding to the first pressure is obtained, the second pressure at the corresponding sampling time may be obtained, which is not limited in this embodiment.
S203, determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
The evaluation index of the sealing performance of the cable to be tested can include a gas mass leakage rate inside the cable to be tested, a gas volume difference inside the cable to be tested and the like, and the gas mass leakage rate and the sealed system volume difference respectively represent the gas leakage condition in a certain time period or moment from two aspects of gas mass and volume.
In this embodiment, after obtaining the first pressure and the second pressure, the computer device may determine, based on the first pressure and the second pressure, a gas mass leakage rate of the cable to be measured according to a preset calculation formula of the gas mass leakage rate; according to a preset calculation formula of the gas volume difference, the gas volume difference of the cable to be tested can be determined, and therefore the sealing performance of the cable to be tested is determined based on the determined gas mass leakage rate and the determined gas volume difference. Exemplarily, if the calculated gas mass leakage rate of the cable to be tested is smaller than a preset first threshold value and/or the calculated gas volume difference of the cable to be tested is smaller than a preset second threshold value, it is determined that the sealing performance of the cable to be tested is good; if the calculated gas mass leakage rate of the cable to be tested is larger than a preset first threshold value and/or the calculated gas volume difference of the cable to be tested is larger than a preset second threshold value, the poor sealing performance of the cable to be tested is determined, and the sealing performance of the cable to be tested is determined based on the gas mass leakage rate and the gas volume difference, so that the quantitative evaluation of the sealing performance of the cable to be tested can be comprehensively and multidimensional.
According to the cable tightness testing method, the sealing interfaces are arranged at the two ends of the cable to be tested, the sealing performance of the cable to be tested is detected by adopting an internal pressure type detection principle, and after the internal pressure of the cable to be tested reaches a constant pressure, the change of the pressure after a preset time period is tested, so that the sealing performance of the cable to be tested is determined. Compared with methods such as a water permeability test and the like, the method has the characteristics of low consumption, high precision, short time, simplicity in operation and the like. The method provides a detection method and an evaluation index for the sealing performance of the XLPE cable, can be used for network access detection and evaluation of the cable, and has important significance for ensuring the sealing performance of the cable structure and reducing the damp faults of the cable line.
The evaluation index of the sealing performance of the cable to be tested comprises a gas mass leakage rate, and the computer can calculate the gas mass leakage rate of the cable to be tested according to the following embodiments, in one optional embodiment, the determining the sealing performance of the cable according to the first pressure and the second pressure comprises:
and calculating the gas mass leakage rate of the cable to be measured according to the first pressure intensity and the second pressure intensity.
Optionally, as shown in fig. 3, calculating a gas mass leakage rate of the cable to be measured according to the first pressure and the second pressure includes:
s301, obtaining the internal volume of the cable to be tested and the gas temperature inside the cable to be tested.
The gas temperature inside the cable to be measured refers to the thermodynamic temperature of the gas, that is, the absolute temperature of the gas.
In this embodiment, the computer device may determine the internal volume of the cable to be tested according to the size of the cable to be tested; the computer device may obtain the gas thermodynamic temperature inside the cable to be tested from the sealing test device, or the computer device may also obtain the gas thermodynamic temperature inside the cable through another temperature sensor, which is not limited in this embodiment.
S302, calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure.
In the present embodiment, the first pressure is P1The first pressure is P2And the computer device calculates the difference between the first pressure and the second pressure, the computer device then changes Δ P to P1-P2And determining the pressure difference corresponding to the preset time period.
S303, calculating the gas mass leakage rate of the cable to be measured according to the pressure difference, the internal volume, the gas temperature, the duration of the preset time period, the gas molar mass and the gas constant.
In the present embodiment, the calculation formula of the known gas mass m is as follows:
m＝nM
wherein n is the amount of substance; m is the gas molar mass.
The gas pressure calculation formula is as follows:
PV＝nRT
wherein P is the gas pressure; v is the gas volume; n is the amount of substance; t is the thermodynamic temperature of the gas; r is a gas constant.
Based on the known calculation formula, the whole test is set to be carried out under a constant temperature state, and then the gas mass leakage rate Q corresponding to the preset time period delta tΔtThe calculation formula of (c) can be expressed as:
wherein, Δ m is the gas mass variation within a preset time period Δ t; Δ P is a gas pressure change rate within a preset time period Δ t; v0The inner volume of the sealing detection system is equivalent to the inner volume of the cable to be detected.
Optionally, the computer device is configured to determine, based on the gas leakage profile obtained from the seal testing apparatus,calculating the gas mass leakage rate Q at a certain time ttThe calculation formula of (c) can be expressed as:
wherein, the ratio of P 'to t' is the pressure change rate at time t in the gas leakage curve.
In this embodiment, the computer device may calculate the gas mass leakage rate Q corresponding to the preset time period Δ t based on the known parameters and a preset calculation formulaΔtAnd a gas mass leakage rate Q at a certain time ttThe method can simply and effectively obtain the gas quality leakage rate evaluation index of the cable to be tested, and provides data support for determining the sealing performance of the cable to be tested.
The evaluation index of the sealing performance of the cable to be tested includes an internal volume difference, and the computer may calculate the internal volume difference of the cable to be tested according to the following embodiments, and in another scenario, in one optional embodiment, the determining the sealing performance of the cable to be tested according to the first pressure and the second pressure includes:
and calculating the internal volume difference of the cable to be measured according to the first pressure intensity and the second pressure intensity.
Optionally, as shown in fig. 4, calculating the difference of the internal volumes of the cables to be measured according to the first pressure and the second pressure includes:
s401, calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure.
In the present embodiment, the first pressure is P1The first pressure is P2And the computer device calculates the difference between the first pressure and the second pressure, the computer device then changes Δ P to P1-P2And determining the pressure difference corresponding to the preset time period.
S402, obtaining the internal volume of the cable to be measured.
In this embodiment, the computer device may determine the internal volume of the cable to be tested according to the size of the cable to be tested, which is not limited by this embodiment.
And S403, calculating the internal volume difference of the cable to be measured according to the pressure difference, the internal volume, the duration of the preset time period and the standard atmospheric pressure.
In this embodiment, based on the known information given in step 303, the whole test is set to be performed in a constant temperature state, and then the internal volume difference S corresponding to the preset time period Δ t is setΔtThe calculation formula of (c) can be expressed as:
wherein V is the gas volume; Δ P is a gas pressure change rate within a preset time period Δ t; pSIs at standard atmospheric pressure.
Optionally, the computer device calculates the internal volume difference S at a time t based on a gas leakage profile obtained from the seal testing devicetThe calculation formula of (c) can be expressed as:
wherein, the ratio of P 'to t' is the pressure change rate at time t in the gas leakage curve.
In this embodiment, the computer device may calculate the internal volume difference S corresponding to the preset time period Δ t based on the known parameters and a preset calculation formulaΔtAnd the internal volume difference S at a certain time ttThe method can simply and effectively obtain the evaluation index of the gas internal volume difference of the cable to be tested, and provides data support for determining the sealing performance of the cable to be tested.
The condition that the computer device obtains the first pressure is that the internal air pressure of the cable to be measured reaches a constant pressure state, wherein the determination of whether the constant pressure state is reached may be obtained through the following embodiments. In one optional embodiment, as shown in fig. 5, the method further includes:
s501, inflating the cable to be tested through an inflation hole of the cable tightness testing device, and acquiring the internal pressure of the cable to be tested according to a preset sampling frequency.
In this embodiment, the computer device may perform an inflation operation on an inflation hole at one end of a cable to be tested in the cable tightness testing device through the sealing testing device, and obtain the internal pressure of the cable to be tested at each sampling time according to a preset sampling frequency.
S502, if the difference value between the internal pressure at the current sampling moment and the internal pressure at the previous sampling moment is smaller than a preset difference threshold value, determining that the inside of the cable to be tested reaches a constant-pressure state.
In this embodiment, after obtaining the internal pressures of the cable to be tested at the at least two sampling times, the computer device calculates a difference between the internal pressure at the current sampling time and the internal pressure at the previous sampling time, and determines that the inside of the cable to be tested reaches a constant-pressure state when it is determined that the difference between the internal pressure at the previous sampling time and the internal pressure at the previous sampling time is smaller than a preset difference threshold. Illustratively, the internal pressure at the last sampling time is PS1The internal pressure at the current sampling time is PS2Calculating Δ PS＝PS1-PS2At Δ PSLess than a predetermined difference threshold value DeltaPSSIn this embodiment, it is determined that the inside of the cable to be tested reaches a constant voltage state.
In this embodiment, the computer device determines whether the internal pressure of the cable to be measured reaches the constant pressure state according to the internal pressure of the cable to be measured at the previous sampling time and the internal pressure of the cable to be measured at the current sampling time, and the method is simple and effective.
To better explain the above method, as shown in fig. 6, the present embodiment provides a method for testing cable tightness, which specifically includes:
s101, inflating a cable to be tested through an inflation hole of a cable tightness testing device, and acquiring the internal pressure of the cable to be tested according to a preset sampling frequency;
s102, if the difference value between the internal pressure at the current sampling moment and the internal pressure at the last sampling moment is smaller than a preset difference threshold value, determining that the inside of the cable to be tested reaches a constant-pressure state;
s103, acquiring a first pressure when the interior of the cable to be detected reaches a constant pressure state;
s104, after a preset time period, acquiring a second pressure inside the cable to be measured;
s105, acquiring the internal volume of the cable to be tested, the gas temperature inside the cable to be tested and the internal volume of the cable to be tested;
s106, calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure;
s107, calculating the gas mass leakage rate of the cable to be measured according to the pressure difference, the internal volume, the gas temperature, the duration of a preset time period, the gas molar mass and the gas constant;
s108, calculating the internal volume difference of the cable to be measured according to the pressure difference, the internal volume, the duration of a preset time period and the standard atmospheric pressure;
s109, determining the sealing performance of the cable to be tested according to the gas mass leakage rate and the internal volume difference of the cable to be tested.
In this embodiment, the two ends of the cable to be tested are provided with the sealing interfaces, the sealing performance of the cable to be tested is detected by adopting an internal pressure type detection principle, and compared with methods such as a water penetration test, the method has the characteristics of low consumption, high precision, short time, simplicity in operation and the like. The method provides a detection method and an evaluation index for the sealing performance of the XLPE cable, can be used for network access detection and evaluation of the cable, and has important significance for ensuring the sealing performance of the cable structure and reducing the damp faults of the cable line.
The implementation principle and technical effect of the cable tightness testing method provided by the above embodiment are similar to those of the above method embodiment, and are not described herein again.
It should be understood that although the various steps in the flow charts of fig. 2-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 7, there is provided a cable tightness testing device, including:
the acquisition module 01 is used for acquiring a first pressure when the interior of the cable to be detected reaches a constant pressure state;
the obtaining module 01 is further configured to obtain a second pressure inside the cable to be tested after a preset time period;
and the calculating module 02 is used for determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
In one optional embodiment, the calculation module 02 is configured to calculate a gas mass leakage rate of the cable to be tested according to the first pressure and the second pressure.
In one optional embodiment, the calculation module 02 is configured to obtain an internal volume of the cable to be tested and a gas temperature inside the cable to be tested; calculating a pressure difference corresponding to a preset time period according to the first pressure and the second pressure; and calculating the gas mass leakage rate of the cable to be measured according to the pressure difference, the internal volume, the gas temperature, the duration of a preset time period, the gas molar mass and the gas constant.
In one optional embodiment, the calculating module 02 is configured to calculate an internal volume difference of the cable to be measured according to the first pressure and the second pressure.
In one optional embodiment, the calculating module 02 is configured to calculate a pressure difference corresponding to a preset time period according to the first pressure and the second pressure; acquiring the internal volume of a cable to be tested; and calculating the internal volume difference of the cable to be measured according to the pressure difference, the internal volume, the duration of the preset time period and the standard atmospheric pressure.
In one alternative embodiment, as shown in fig. 8, the apparatus further includes a determining module 03;
the determining module 03 is used for inflating the cable to be tested through an inflation hole of the cable tightness testing device, and acquiring the internal pressure of the cable to be tested according to a preset sampling frequency; and if the difference value between the internal pressure intensity at the current sampling moment and the internal pressure intensity at the previous sampling moment is smaller than a preset difference threshold value, determining that the inside of the cable to be tested reaches a constant voltage state.
For specific definition of the cable tightness testing device, reference may be made to the above definition of the cable tightness testing method, which is not described herein again. All or part of each module in the cable tightness testing device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 9. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a cable tightness testing method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring a first pressure when the interior of a cable to be tested reaches a constant pressure state;
after a preset time period, acquiring a second pressure intensity inside the cable to be measured;
and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
The implementation principle and technical effect of the computer device provided by the above embodiment are similar to those of the above method embodiment, and are not described herein again.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a first pressure when the interior of a cable to be tested reaches a constant pressure state;
after a preset time period, acquiring a second pressure intensity inside the cable to be measured;
and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
The implementation principle and technical effect of the computer-readable storage medium provided by the above embodiments are similar to those of the above method embodiments, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A cable tightness testing device is characterized by comprising a first sealing interface and a second sealing interface; the first sealing interface comprises an inflation hole;
the first sealing interface is arranged at the first end of the cable to be tested; the second sealing interface is arranged at the second end of the cable to be tested;
the cable tightness testing device is used for inflating the cable to be tested through the inflation hole until the interior of the cable to be tested reaches a constant pressure state, acquiring a first pressure intensity in the cable to be tested in the constant pressure state, acquiring a second pressure intensity in the cable to be tested after a preset time period, and determining the sealing performance of the cable to be tested according to the first pressure intensity and the second pressure intensity.
2. A cable tightness test method is characterized by being applied to the cable tightness test device provided by claim 1; the method comprises the following steps:
acquiring a first pressure when the interior of a cable to be tested reaches a constant pressure state;
after a preset time period, acquiring a second pressure intensity in the cable to be tested;
and determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
3. The method of claim 2, wherein determining the sealing performance of the cable based on the first pressure and the second pressure comprises:
and calculating the gas mass leakage rate of the cable to be tested according to the first pressure and the second pressure.
4. The method of claim 3, wherein calculating the gas mass leakage rate of the cable under test from the first pressure and the second pressure comprises:
acquiring the internal volume of the cable to be tested and the gas temperature inside the cable to be tested;
calculating a pressure difference corresponding to the preset time period according to the first pressure and the second pressure;
and calculating the gas mass leakage rate of the cable to be tested according to the pressure difference, the internal volume, the gas temperature, the duration of the preset time period, the gas molar mass and the gas constant.
5. The method of claim 2, wherein determining the sealing performance of the cable under test based on the first pressure and the second pressure comprises:
and calculating the internal volume difference of the cable to be measured according to the first pressure intensity and the second pressure intensity.
6. The method of claim 5, wherein calculating the difference in internal volume of the cable under test from the first pressure and the second pressure comprises:
calculating a pressure difference corresponding to the preset time period according to the first pressure and the second pressure;
acquiring the internal volume of the cable to be tested;
and calculating the internal volume difference of the cable to be measured according to the pressure difference, the internal volume, the duration of the preset time period and the standard atmospheric pressure.
7. The method according to any one of claims 2-6, further comprising:
inflating the cable to be tested through an inflation hole of the cable tightness testing device, and acquiring the internal pressure of the cable to be tested according to a preset sampling frequency;
and if the difference value between the internal pressure intensity at the current sampling moment and the internal pressure intensity at the previous sampling moment is smaller than a preset difference threshold value, determining that the interior of the cable to be tested reaches a constant-pressure state.
8. A cable closure testing device, the device comprising:
the acquisition module is used for acquiring a first pressure when the interior of the cable to be detected reaches a constant pressure state;
the acquisition module is used for acquiring a second pressure intensity in the cable to be detected after a preset time period;
and the calculation module is used for determining the sealing performance of the cable to be tested according to the first pressure and the second pressure.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 2 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 2 to 7.
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Application publication date: 20211105 |