CN114088319A - XLPE cable core tightness detection device and evaluation method - Google Patents
XLPE cable core tightness detection device and evaluation method Download PDFInfo
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- CN114088319A CN114088319A CN202111363361.9A CN202111363361A CN114088319A CN 114088319 A CN114088319 A CN 114088319A CN 202111363361 A CN202111363361 A CN 202111363361A CN 114088319 A CN114088319 A CN 114088319A
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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
- 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
Abstract
The application discloses tightness detection device and evaluation method for a cable core of an XLPE cable, wherein the tightness detection device for the cable core of the XLPE cable comprises a cable to be detected and a sealing detection device. The first end of the cable to be tested is designed in a sealing mode, and the second end of the cable to be tested is provided with a sealing interface. The sealing detection device is connected with the sealing interface of the cable to be detected through the first conveying pipe, is designed to be capable of inflating or exhausting air in the cable to be detected, and is capable of monitoring the air pressure in the cable to be detected after the preset air pressure is inflated or exhausted. The device is simple in design structure and convenient to use, monitors the air leakage condition of the cable to be detected, realizes detection of the density and the sealing performance of the cable core, and has important significance for evaluating the sealing performance of the cable core and reducing the damp faults of a cable line. The application also provides a tightness evaluation method of the XLPE cable core, which is used for network access detection and evaluation of the quality of cable equipment and has important significance for ensuring the tightness of the cable core and reducing the damp faults of a cable line.
Description
Technical Field
The application relates to the technical field of cable detection, in particular to a device for detecting tightness of a XLPE cable core and an evaluation method.
Background
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 damp and hot climate, the defects caused by the fact that distribution network cables are affected with damp are quite common, and the risks of serious cable faults and huge economic losses exist. At present, distribution network cables are mostly laid in modes of cable trenches, soil direct burial and the like, are influenced by complex factors such as mechanical stress, temperature fields, electric fields, moisture and humidity for a long time in the operation process, and are main external factors of cable moisture. Moisture and humidity accumulated in the long-term storage and transportation process of the cable core are main internal sources of cable moisture, and the cable core is easy to enter the insulation during operation, so that defects of water trees, electric trees and the like are caused.
The tightness of the wire core is an important factor influencing the entrance and accumulation of moisture, is determined by factors such as the density of the wire core, and the like, and ensures higher density and tightness to be an important guarantee for the stable operation of the cable on the basis of ensuring the electrical performance of the wire core, but the evaluation method and the structural design applied to the tightness detection of the wire core of the cable are rare at present.
Disclosure of Invention
In view of this, the first objective of the present application is to provide a tightness detection device for a XLPE cable core, which can detect the density and the tightness of a cable core, provide a basis for evaluating the tightness of the cable core, and contribute to reducing the damp faults of a cable line.
The second purpose of the application is to provide an XLPE cable core tightness evaluation method, which can be used for network access detection and evaluation of cable equipment quality and has important significance for ensuring cable core tightness and reducing cable line damp faults.
In order to achieve the technical purpose, the application provides a tightness detection device for a cable core of an XLPE cable, comprising:
the cable to be tested is sealed at the first end and provided with a sealing interface at the second end;
the sealing detection device is connected with the sealing interface of the cable to be detected through the first conveying pipe, can be used for inflating or exhausting the cable to be detected, and can monitor the air pressure in the cable to be detected after inflating or exhausting preset air pressure.
Further, the sealing interface comprises:
and the sealing ring is sleeved and fixed at the second end of the cable to be tested and is provided with an air guide hole.
Further, the sealing detection device is a differential pressure type air tightness detector.
Further, still include:
the first end of the standard cable is also sealed, and the second end of the standard cable is also provided with a sealing interface;
a first end of the second conveying pipe is connected to the first conveying pipe, a second end of the second conveying pipe is connected with a sealing interface of the standard cable, a first control valve is arranged between a position, connected with the second conveying pipe, on the first conveying pipe and the cable to be tested, and a second control valve is arranged on the second conveying pipe;
a first end of the differential pressure sensor is connected to a position of a pipe section between the first control valve and the standard cable on the first conveying pipe, and a second section of the differential pressure sensor is connected to a position of a pipe section between the second control valve and the cable to be tested on the second conveying pipe;
and the pressure gauge is arranged between the connecting position of the first conveying pipe and the second conveying pipe and the sealing detection device.
A method for evaluating tightness of a XLPE cable core is applied to a tightness detection device of the XLPE cable core and comprises the following steps:
s1, inflating the cable to be detected to a preset air pressure through the sealing detection device;
s2, monitoring the gas pressure value in the cable to be detected in real time through the sealing detection device, and drawing a gas leakage curve in a monitoring time domain according to the gas pressure value obtained through monitoring;
s3, calculating the gas mass leakage rate and the volume difference of the closed system in a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula;
and S4, evaluating the cable to be tested according to the calculated gas mass leakage rate and the volume difference of the closed system based on a preset evaluation rule.
Further, the gas mass leakage rate in a certain time period is calculated by the formula:
where Δ t is a certain time period, QΔtIs the gas mass leakage rate over a time period Δ t, M is the gas molar mass, V0The equivalent internal volume of the XLPE cable core tightness detection device is shown, T is the thermodynamic temperature of gas, R is a gas constant, and delta P is the gas pressure change rate in a time period delta T;
the calculation formula of the volume difference of the closed system in a certain time period is as follows:
where Δ t is a certain time period, SΔtIs the volume difference of the closed system in the time period delta t, V is the gas volume, delta P is the gas pressure change rate in the time period delta t, PsIs at standard atmospheric pressure.
Further, the gas mass leakage rate at a certain moment is calculated by the formula:
wherein t' is a certain time period, QtWhen isThe mass leakage rate of gas in the notch t', M being the molar mass of the gas, V0The equivalent internal volume of the tightness detection device of the XLPE cable core is shown, T is the thermodynamic temperature of gas, R is a gas constant, and P 'is the gas pressure change rate at the moment T';
the calculation formula of the volume difference of the closed system at a certain moment is as follows:
wherein t' is a certain time, StThe volume difference of the closed system at time t ', V is the gas volume, P ' is the gas pressure change rate at time t ', PsIs at standard atmospheric pressure.
A method for evaluating tightness of a cable core of an XLPE cable is applied to a tightness detection device of the cable core of the XLPE cable, and comprises the following steps:
s10, inflating the cable to be detected and the standard cable to a preset air pressure through the sealing detection device;
s20, closing the first control valve and the second control valve, monitoring the gas pressure value in the cable to be detected in real time through the differential pressure sensor, and drawing a gas leakage curve in a monitoring time domain according to the gas pressure value obtained through monitoring;
s30, calculating to obtain the gas mass leakage rate and the volume difference of the closed system in a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula;
and S40, evaluating the cable to be tested according to the calculated gas mass leakage rate and the sealed system volume difference based on a preset evaluation rule.
Further, the gas mass leakage rate in a certain time period is calculated by the formula:
where Δ t is a certain time period, QΔtIs the gas mass in the time interval Δ tAmount leakage rate, M is gas molar mass, V0The equivalent internal volume of the XLPE cable core tightness detection device is shown, T is the thermodynamic temperature of gas, R is a gas constant, and delta P is the gas pressure change rate in a time period delta T;
the calculation formula of the volume difference of the closed system in a certain time period is as follows:
where Δ t is a certain time period, SΔtIs the volume difference of the closed system in the time period delta t, V is the gas volume, delta P is the gas pressure change rate in the time period delta t, PsIs at standard atmospheric pressure.
Further, the gas mass leakage rate at a certain moment is calculated by the formula:
wherein t' is a certain time period, QtThe gas mass leakage rate at time t', M is the gas molar mass, V0The equivalent internal volume of the XLPE cable core tightness detection device is shown, T is the gas thermodynamic temperature, R is a gas constant, and P 'is the gas pressure variation rate at the moment T';
the calculation formula of the volume difference of the closed system at a certain moment is as follows:
wherein t' is a certain time, StThe volume difference of the closed system at time t ', V is the gas volume, P ' is the gas pressure change rate at time t ', PsIs at standard atmospheric pressure.
According to the technical scheme, the tightness detection device for the XLPE cable core comprises a cable to be detected and a sealing detection device, wherein the first end of the cable to be detected is designed in a sealing mode, and the second end of the cable to be detected is provided with a sealing interface. The sealing detection device is connected with the sealing interface of the cable to be detected through the first conveying pipe, is designed to be capable of inflating or exhausting air in the cable to be detected, and is capable of monitoring the air pressure in the cable to be detected after the preset air pressure is inflated or exhausted. This device design simple structure, convenient to use can monitor the gas leakage condition of the cable that awaits measuring, realize detecting the density and the leakproofness of cable core, to aassessment cable core leakproofness, reduce cable line fault of weing significant.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a first structure of a tightness detection device for XLPE cable cores provided in the present application;
fig. 2 is a second structural schematic diagram of a tightness detection device for a cable core of an XLPE cable provided in the present application;
fig. 3 is a schematic diagram of a structure of a to-be-tested cable of the XLPE cable core tightness detection device provided in the present application;
fig. 4 is a schematic flow chart of a first method for evaluating tightness of XLPE cable cores provided in the present application;
fig. 5 is a schematic flow chart of a second method for evaluating tightness of XLPE cable cores provided in the present application;
FIG. 6 is a gas leakage curve diagram of a method for evaluating tightness of XLPE cable cores provided by the application;
in the figure: 1. a seal detection device; 21. a first delivery pipe; 22. a second delivery pipe; 3. a cable to be tested; 31. sealing the interface; 311. a seal ring; 312. an air vent; 4. a standard cable; 5. a differential pressure sensor; 6. a pressure gauge; 71. a first control valve; 72. a second control valve.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The embodiment of the application discloses a device and an evaluation method for detecting tightness of a XLPE cable core.
Referring to fig. 1 and fig. 3, an embodiment of a tightness detection apparatus and an evaluation method for XLPE cable cores provided in an embodiment of the present application includes:
a cable to be tested 3 and a seal detection device 1.
The first end of the cable 3 to be detected is sealed, the second end is provided with the sealing interface 31, the length of the cable 3 to be detected can be selected according to actual detection needs without limitation, and the cable 3 structure to be detected comprises a cable core, an inner shielding layer and an XLPE main insulation, wherein the main insulation is complete and is not damaged. The sealing detection device 1 is connected with the sealing interface 31 of the cable 3 to be detected through the first conveying pipe 21, and can be used for inflating or exhausting the cable 3 to be detected, and monitoring the air pressure in the cable 3 to be detected after the preset air pressure is inflated or exhausted. This device design simple structure, convenient to use can monitor the gas leakage condition of cable 3 that awaits measuring, realize detecting the density and the leakproofness of cable core, have the significance to aassessment cable core leakproofness, reduction cable line trouble of weing.
The above is a first embodiment of the tightness detection device for XLPE cable cores provided in this application, and the following is a second embodiment of the tightness detection device for XLPE cable cores provided in this application, and please refer to fig. 1 to fig. 3 specifically.
The scheme based on the first embodiment is as follows:
further, as shown in fig. 3, the sealing interface 31 includes a sealing ring 311. The sealing ring 311 is fixedly sleeved on the second end of the cable 3 to be tested and is provided with an air guide hole 312.
Further, the sealing detection device 1 may be a differential pressure type air tightness detector, and rapidly inflates the cable 3 to be detected to a constant air pressure during the test, and monitors the air pressure value in the sealed cavity of the cable 3 to be detected in real time after the inflation is stopped.
Further, as shown in fig. 2, a standard cable 4, a second delivery pipe 22, and a differential pressure sensor 5 may be additionally provided.
Wherein the first end of the standard cable 4 is also sealed and the second end is also provided with a sealing interface 31. The first end of the second delivery pipe 22 is connected to the first delivery pipe 21, the second end of the second delivery pipe 22 is connected to the sealing interface 31 of the standard cable 4, a first control valve 71 is arranged between the position, connected with the second delivery pipe 22, on the first delivery pipe 21 and the cable 3 to be tested, and a second control valve 72 is arranged on the second delivery pipe 22. A first end of the differential pressure sensor 5 is connected to a position of a pipe section between the first control valve 71 and the standard cable on the first conveying pipe 21, and a second end of the differential pressure sensor 5 is connected to a position of a pipe section between the second control valve 72 and the cable 3 to be measured on the second conveying pipe 22. After the standard cable 4 and the cable 3 to be detected are filled with certain gas through the sealing detection device 1, the first control valve 71 and the second control valve 72 are closed, so that the pressure data of the cable 3 to be detected relative to the standard cable 4 can be detected through the differential pressure sensor 5, the sealing detection of the cable 3 to be detected is realized, the interference of factors such as temperature change and the like is eliminated, and the detection precision is higher. In order to control the inflation pressure more conveniently, a pressure gauge 6 is arranged between the position of the first delivery pipe 21 connected with the second delivery pipe 22 and the sealing detection device 1.
As shown in fig. 4 and 6, the present application further provides a first method for evaluating tightness of a XLPE cable core, which is applied to the device for detecting tightness of an XLPE cable core in the first embodiment, and includes:
and S1, inflating the cable to be detected to a preset air pressure through the sealing detection device. It should be noted that, the cable to be detected is inflated by controlling the sealing detection device until the preset air pressure requirement is met, that is, the cable is inflated by a certain amount.
S2, monitoring the gas pressure value in the cable to be detected in real time through the sealing detection device, and drawing a gas leakage curve in the monitoring time domain according to the gas pressure value obtained through monitoring.
And S3, calculating to obtain the gas mass leakage rate and the volume difference of the closed system within a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula.
And S4, evaluating the cable to be tested according to the calculated gas mass leakage rate and the volume difference of the closed system based on a preset evaluation rule. It should be noted that the preset evaluation rule may be obtained based on a summary of historical test data; the gas mass leakage rate and the volume difference of the closed system respectively represent the gas leakage condition in a certain time period or moment from two aspects of gas mass and volume, the tightness of the cable core can be explained and evaluated in all aspects and in multiple dimensions, two important indexes for evaluating the tightness of the cable core are provided, and when multiple groups of data are compared and evaluated, the gas leakage parameters in the same time period and moment need to be contrasted and analyzed.
As shown in fig. 5 and 6, the present application further provides a second method for evaluating tightness of XLPE cable core, which is applied to the device for detecting tightness of XLPE cable core in the second embodiment, and includes:
and S10, inflating the cables to be detected and the standard cables to a preset air pressure through the sealing detection device. The step S10 is the same as the step S1, and is not described in detail.
And S20, closing the first control valve and the second control valve, monitoring the gas pressure value in the cable to be detected in real time through the differential pressure sensor, and drawing a gas leakage curve in a monitoring time domain according to the gas pressure value obtained through monitoring.
And S30, calculating to obtain the gas mass leakage rate and the volume difference of the closed system within a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula. The step S30 is the same as the step S3, and is not described in detail.
And S40, evaluating the cable to be tested according to the calculated gas mass leakage rate and the sealed system volume difference based on a preset evaluation rule. The step S40 is the same as the step S4, and is not described in detail.
Further, the gas mass leakage rate in a certain time period is calculated by the formula:
where Δ t is a certain time period, QΔtIs the gas mass leakage rate over a time period Δ t, M is the gas molar mass, V0The equivalent internal volume of the XLPE cable core tightness detection device is shown, T is the gas thermodynamic temperature, R is a gas constant, and delta P is the gas pressure change rate in a time period delta T;
the calculation formula of the volume difference of the closed system in a certain time period is as follows:
where Δ t is a certain time period, SΔtIs the volume difference of the closed system in the time period delta t, V is the gas volume, delta P is the gas pressure change rate in the time period delta t, PsIs at standard atmospheric pressure.
Further, the gas mass leakage rate at a certain moment is calculated by the formula:
wherein t' is a certain time, QtThe gas mass leakage rate at time t', M being the gas molar mass, V0The equivalent internal volume of the tightness detection device of the XLPE cable core is shown, T is the thermodynamic temperature of gas, R is a gas constant, and P 'is the gas pressure change rate at the moment T';
the calculation formula of the volume difference of the closed system at a certain moment is as follows:
wherein t' is a certain time, StThe volume difference of the closed system at time t ', V is the gas volume, P ' is the gas pressure change rate at time t ', PsIs at standard atmospheric pressure.
The tightness detection device for the XLPE cable core is designed, the tightness and the air tightness of the cable core can be detected, and compared with methods such as a water permeability test and the like, the tightness detection device has the characteristics of low consumption, high precision, short time, simplicity in operation and the like. The evaluation method can be used for network access detection and evaluation of the quality of cable equipment, and has important significance for ensuring the sealing performance of cable cores and reducing the damp faults of cable lines.
The device and the method for detecting tightness of XLPE cable core provided by the present application are described in detail above, and those skilled in the art may change the specific implementation manner and the application scope according to the idea of the embodiment of the present application.
Claims (10)
1. The utility model provides a XLPE cable core leakproofness detection device which characterized in that includes:
the cable to be tested is sealed at the first end and provided with a sealing interface at the second end;
the sealing detection device is connected with the sealing interface of the cable to be detected through the first conveying pipe, can be used for inflating or exhausting the cable to be detected, and can monitor the air pressure in the cable to be detected after inflating or exhausting preset air pressure.
2. The device for detecting the tightness of the XLPE cable core according to claim 1, wherein the sealing interface comprises:
and the sealing ring is sleeved and fixed at the second end of the cable to be tested and is provided with an air guide hole.
3. The device for detecting the tightness of the XLPE cable core according to claim 1, wherein the sealing detection device is a differential pressure type air tightness detector.
4. The device for detecting the tightness of the XLPE cable core according to claim 1, further comprising:
the first end of the standard cable is also sealed, and the second end of the standard cable is also provided with a sealing interface;
a first end of the second conveying pipe is connected to the first conveying pipe, a second end of the second conveying pipe is connected with a sealing interface of the standard cable, a first control valve is arranged between a position, connected with the second conveying pipe, on the first conveying pipe and the cable to be tested, and a second control valve is arranged on the second conveying pipe;
a first end of the differential pressure sensor is connected to a position of a pipe section between the first control valve and the standard cable on the first conveying pipe, and a second section of the differential pressure sensor is connected to a position of a pipe section between the second control valve and the cable to be tested on the second conveying pipe;
and the pressure gauge is arranged between the connecting position of the first conveying pipe and the second conveying pipe and the sealing detection device.
5. An evaluation method for cable core tightness of XLPE cables is characterized in that the evaluation method is applied to the device for detecting cable core tightness of XLPE cables in any one of claims 1 to 3, and comprises the following steps:
s1, inflating the cable to be detected to a preset air pressure through the sealing detection device;
s2, monitoring the gas pressure value in the cable to be detected in real time through the sealing detection device, and drawing a gas leakage curve in a monitoring time domain according to the gas pressure value obtained through monitoring;
s3, calculating to obtain the gas mass leakage rate and the volume difference of the closed system in a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula;
and S4, evaluating the cable to be tested according to the calculated gas mass leakage rate and the sealed system volume difference based on a preset evaluation rule.
6. The method for evaluating the tightness of the XLPE cable core according to claim 5, wherein the calculation formula of the gas mass leakage rate in a certain time period is as follows:
where Δ t is a certain time period, QΔtIs the gas mass leakage rate over a time period Δ t, M is the gas molar mass, V0Equivalent of a tightness detection device for XLPE cable coresThe internal volume, T is the thermodynamic temperature of the gas, R is the gas constant, and Δ P is the rate of change of the gas pressure within a time period Δ T;
the calculation formula of the volume difference of the closed system in a certain time period is as follows:
where Δ t is a certain time period, SΔtIs the volume difference of the closed system in the time period delta t, V is the gas volume, delta P is the gas pressure change rate in the time period delta t, PsIs at standard atmospheric pressure.
7. The method for evaluating the tightness of the XLPE cable core according to claim 5, wherein the calculation formula of the gas mass leakage rate at a certain moment is as follows:
wherein t' is a certain time period, QtThe gas mass leakage rate at time t', M being the gas molar mass, V0The equivalent internal volume of the tightness detection device of the XLPE cable core is shown, T is the thermodynamic temperature of gas, R is a gas constant, and P 'is the gas pressure change rate at the moment T';
the calculation formula of the volume difference of the closed system at a certain moment is as follows:
wherein t' is a certain time, StThe volume difference of the closed system at time t ', V is the gas volume, P ' is the gas pressure change rate at time t ', PsIs at standard atmospheric pressure.
8. An XLPE cable core tightness evaluation method is characterized by being applied to the XLPE cable core tightness detection device of claim 4, and comprises the following steps:
s10, inflating the cables to be detected and the standard cables to a preset air pressure through the sealing detection device;
s20, closing the first control valve and the second control valve, monitoring the gas pressure value in the cable to be detected in real time through the differential pressure sensor, and drawing a gas leakage curve in a monitoring time domain according to the gas pressure value obtained through monitoring;
s30, calculating to obtain the gas mass leakage rate and the volume difference of the closed system in a certain time period or at a certain moment according to the drawn gas leakage curve in the monitoring time domain and a preset calculation formula;
and S40, evaluating the cable to be tested according to the calculated gas mass leakage rate and the sealed system volume difference based on a preset evaluation rule.
9. The method for evaluating the tightness of the XLPE cable core according to claim 8, wherein the calculation formula of the gas mass leakage rate in a certain time period is as follows:
where Δ t is a certain time period, QΔtIs the gas mass leakage rate over a time period Δ t, M is the gas molar mass, V0The equivalent internal volume of the XLPE cable core tightness detection device is shown, T is the thermodynamic temperature of gas, R is a gas constant, and delta P is the gas pressure change rate in a time period delta T;
the calculation formula of the volume difference of the closed system in a certain time period is as follows:
where Δ t is a certain time period, SΔtVolume difference of the closed system within a time period delta t, V is gasProduct, Δ P, is the rate of change of gas pressure over a time period Δ t, PsIs at standard atmospheric pressure.
10. The method for evaluating the tightness of the XLPE cable core according to claim 8, wherein the calculation formula of the gas mass leakage rate at a certain moment is as follows:
wherein t' is a certain time, QtThe gas mass leakage rate at time t', M is the gas molar mass, V0The equivalent internal volume of the tightness detection device of the XLPE cable core is shown, T is the thermodynamic temperature of gas, R is a gas constant, and P 'is the gas pressure change rate at the moment T';
the calculation formula of the volume difference of the closed system at a certain moment is as follows:
wherein t' is a certain time, StThe volume difference of the closed system at time t ', V is the gas volume, P ' is the gas pressure change rate at time t ', PsIs at standard atmospheric pressure.
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| RU2380669C1 (en) * | 2008-09-15 | 2010-01-27 | Государственное образовательное учреждение высшего профессионального образования "Поволжский государственный университет телекоммуникаций и информатики" | Method of monitoring channel air tightness of intercity cable-conduit line of fibre-optic transmission line |
| CN104535278A (en) * | 2014-12-31 | 2015-04-22 | 珠海凌达压缩机有限公司 | Detecting method and device for work-piece air tightness |
| CN213748924U (en) * | 2020-12-28 | 2021-07-20 | 宝胜高压电缆有限公司 | Rapid sealing device for cable sheath detection |
| CN112834136A (en) * | 2020-12-30 | 2021-05-25 | 武汉智迅创源科技发展股份有限公司 | Method for detecting leakage and blockage of finished precision infusion apparatus by using differential pressure gas path |
| CN113029466A (en) * | 2021-03-05 | 2021-06-25 | 师大瑞利光电科技(清远)有限公司 | Detection method and device for air-tight equipment and electronic equipment |
| CN113607351A (en) * | 2021-07-07 | 2021-11-05 | 广东电网有限责任公司广州供电局 | Cable tightness testing device, method, computer equipment and storage medium |
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