CN107607847A - 110kV high-tension cable detection methods based on polarization depolarization current method - Google Patents
110kV high-tension cable detection methods based on polarization depolarization current method Download PDFInfo
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- CN107607847A CN107607847A CN201711016335.2A CN201711016335A CN107607847A CN 107607847 A CN107607847 A CN 107607847A CN 201711016335 A CN201711016335 A CN 201711016335A CN 107607847 A CN107607847 A CN 107607847A
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Abstract
The invention discloses a kind of 110kV high-tension cable detection methods based on polarization depolarization current method, it is related to high voltage and insulation technology field.The 110kV high-tension cable detection methods based on polarization depolarization current method, cable polarization current and depolarization current are gathered by PDC test systems, so as to obtain the DC conductivity of cable, the state of insulation of cable is judged further according to state of insulation table, predicts the service life of cable；The detection method of the present invention is without destructiveness, high sensitivity, simple to operate, the testing time is short, improves the detection efficiency of high-tension cable.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to a 110kV high-voltage cable detection method based on a polarization depolarization current method.
Background
Aiming at the problem of diagnosing the insulation aging of the crosslinked polyethylene power cable, a Polarization depolarisation Current method (PDC) based on a medium response principle is widely applied to capacitive insulation equipment such as cables and transformers. The insulation test method has the characteristics of non-destructiveness, high sensitivity, simple test method (low requirement on field testers) and short test time (quick measurement is about 10 minutes), is particularly suitable for developing large-scale cable insulation tests, overcomes many defects of the traditional detection technology, and brings new vitality for the cable detection technology. Therefore, experts at home and abroad strongly advocate the method, and a plurality of power grid companies have vigorously developed the research of the PDC technology in the cable detection, and have obtained certain achievements.
The basic principle of the polarization depolarization current method is to collect current data in the polarization and depolarization processes of the dielectric medium, analyze and acquire the response function of the cable, and judge the insulation performance of the cable. The aging form of the cable is mostly water tree. When the cable insulation has three conditions of moisture, electric field and defect (generated under the conditions of external force and the like in the manufacturing process), the moisture can invade into the insulation, and the microstructure of the insulation is changed under the action of the stress of the electric field, so that the insulation fails.
The invention provides a method for detecting a 110kV high-voltage cable based on a polarization depolarization current method.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a 110kV high-voltage cable detection method based on a polarization depolarization current method.
The invention solves the technical problems through the following technical scheme: a110 kV high-voltage cable detection method based on a polarization depolarization current method comprises the following steps:
(1) Removing the outer sheath, the steel armor and the waterproof layer of the cable, exposing the cable core at two ends, then cutting off the outer semi-conducting layers at two ends, wrapping the remaining outer semi-conducting layers of the cable with copper layers, connecting the cable core into a high-voltage output end of a PDC testing system, and connecting the copper layers with a current testing module of the PDC testing system;
(2) The PDC testing system is divided into two processes of polarization and depolarization under the control of a Labview program, and the polarization current and the depolarization current of the cable are respectively collected;
(3) Analyzing and processing the polarization current and depolarization current collected in the step (2) to obtain the cable conductivity;
(4) And comparing the insulation state table to judge the insulation state of the cable.
Further, in the step (1), cable cores of 5cm are exposed at two ends of the cable, and the outer semi-conducting layers at the two ends are respectively cut by 5cm.
Further, the PDC testing system comprises a direct-current power supply module, a single-pole double-throw vacuum relay module, a current testing module, a current limiting resistor and an upper computer; the output end of the single-pole double-throw vacuum relay module is connected with a cable core of a cable to be tested through a current-limiting resistor, and a copper layer of the cable to be tested is connected with the input end of the current testing module; the input end of the single-pole double-throw vacuum relay module is connected with the output end of the direct-current power supply module; the upper computer is respectively connected with an RS232 serial port of the single-pole double-throw vacuum relay module and an RS232 serial port of the current testing module, and is respectively used for controlling the switching of the switches S1 and S2 of the single-pole double-throw vacuum relay module and receiving the current collected by the current testing module; the direct current power supply module, the single-pole double-throw vacuum relay module and the current testing module are grounded together.
Compared with the prior art, the 110kV high-voltage cable detection method based on the polarization and depolarization current method provided by the invention has the advantages that the PDC test system is used for collecting the polarization current and the depolarization current of the cable, so that the direct current conductivity of the cable is obtained, the insulation state of the cable is judged according to the insulation state table, and the service life of the cable is predicted; the detection method has the advantages of no destructiveness, high sensitivity, simple operation and short test time, and improves the detection efficiency of the high-voltage cable; the PDC testing system is integrally boxed, is convenient to carry, integrates testing and analysis, is easy to operate and has high reliability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of the testing of the PDC testing system of the present invention;
wherein: the device comprises a direct current power supply module, a single-pole double-throw vacuum relay module, a current limiting resistor, a cable to be tested, a current testing module and an upper computer, wherein the direct current power supply module is 1, the single-pole double-throw vacuum relay module is 2, the current limiting resistor is 3, the cable to be tested is 4, the current testing module is 5, and the upper computer is 6.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a 110kV high-voltage cable detection method based on a polarization depolarization current method, which comprises the following steps:
(1) And removing the outer sheath, the steel armor and the waterproof layer of the cable, exposing the cable core at two ends by 5cm respectively, then cutting off the outer semi-conducting layers at two ends by 5cm respectively, wrapping the remaining outer semi-conducting layers of the cable with copper layers, connecting the cable core to a high-voltage output end of a PDC testing system, and connecting the copper layers to a current testing module of the PDC testing system.
(2) The PDC testing system is divided into two processes of polarization and depolarization under the control of a Labview program, and the polarization current and the depolarization current of the cable are respectively collected;
as shown in fig. 1, the PDC test system includes a dc power supply module 1, a single-pole double-throw vacuum relay module 2, a current test module 5, a current limiting resistor 3, and an upper computer 6; the output end of the single-pole double-throw vacuum relay module 2 is connected with the cable core of a cable 4 to be tested through a current limiting resistor 3, and the copper layer of the cable 4 to be tested is connected with the input end of a current testing module 5; the input end of the single-pole double-throw vacuum relay module 2 is connected with the output end of the direct-current power supply module 1; the upper computer 6 is respectively connected with an RS232 serial port of the single-pole double-throw vacuum relay module 2 and an RS232 serial port of the current testing module 5, and is respectively used for controlling the switches S1 and S2 of the single-pole double-throw vacuum relay module to be switched and receiving the current collected by the current testing module 5; the direct current power supply module 1, the single-pole double-throw vacuum relay module 2 and the current testing module 5 are grounded together.
The direct current power supply module 1 adopts a ZGF-120 type direct current high-voltage generator, can provide 0-10kV direct current voltage and provides direct current voltage for the polarization and depolarization process; the current testing module 5 adopts a programmable picoammeter; the current limiting resistor 3 is used for avoiding the instrument from being damaged by overlarge current; and a measurement control system based on LabVIEW is deployed on the upper computer 6.
The single-pole double-throw vacuum relay module 2 is connected with the upper computer 6 through an RS232 serial port, and switches S1 and S2 are switched according to a control instruction of the upper computer 6; bidirectional communication is carried out through an RS232 communication protocol, and each data frame comprises 8 bytes which are respectively a data head (fixed as 0x 55), an address, a function code, data (four bytes) and a checksum. When the measurement is started and the preset depolarization time is reached, the upper computer 6 sends a corresponding switch switching command to the single-pole double-throw vacuum relay module 2 to instruct the switch to be switched. After the single-pole double-throw vacuum relay module 2 verifies that the data is correct through the checksum, the corresponding switch closing action is executed, the arc extinguishing switch switching contact is driven, and then a data frame is returned to indicate that the switch action is completed smoothly. The upper computer 6 receives the data returned by the single-pole double-throw vacuum relay module 2, checks the data and transfers the program to the subsequent link after confirming no error.
The polarization depolarization process is as follows: at t 0 When =0, the upper computer 6 sends an instruction to control the switch S1 of the single-pole double-throw vacuum relay module 2 to be closed, the voltage is applied to the cable 4 to be tested through the direct-current power supply module 1, and the polarization stage is entered, wherein the polarization current is Ipol. After a period of polarization time t 1 Then, switching the switch S1 to S2, discharging through the current limiting resistor 3, and entering a depolarization stage, wherein the depolarization current is Idepol; the current test module 5 at the low-voltage end measures the polarization-depolarization current, and then sends the collected current to the upper computer 6 for analysis. Note that, in order to avoid an impact (mechanical jitter of the switch) due to switching, a small piece of data, typically 1s, from which the depolarization current starts is ignored.
(3) And (3) analyzing and processing the polarization current and the depolarization current collected in the step (2) to obtain the cable conductivity.
According to polarization theory and dielectric response time domain theory, assuming an ideal cable is a very large flat plate electrode and filled with a dielectric constant epsilon (neglecting the transitional inner semi-conducting layer and assuming the cable XLPE insulation is isotropic), when an electric field is appliedThe electric displacement is:
according to Maxwell's equation, the total current density in an ideal cable XLPE insulation layer satisfies:
in the formula, epsilon 0 Is the dielectric constant (. Epsilon.) in vacuum 0 ＝8.842×10 -12 F/m)，σ 0 Is the dc conductivity of the XLPE insulation. The first term on the right in the equation is the induced current, the second term is the vacuum displacement current, and the third term is the polarization current, wherein the polarization process is divided into fast polarization and slow polarization. Meanwhile, the polarization intensity is:
in the formula, epsilon ∞ Is the high frequency component of the dielectric constant of the XLPE insulation, and the value is equal to the square of the optical refractive index of the XLPE material. The first term on the right of the equation is the transient displacement component and the second term is the relaxation polarization component. The function f (t) is a response function reflecting slow polarization behavior. Since f (t) =0 (t) before the insulating medium is applied with the electric field<, 0), therefore:
substituting the formula (4) into the formula (2), and finishing to obtain a full current expression:
when the applied voltage is U (t), the full current i (t) can be expressed as:
in the formula, the applied voltage U (t) = E (t) · d, d is XLPE insulation thickness (8.7/10 kV cable XLPE insulation thickness is 4.5 mm).
If the cable 4 to be tested is completely discharged before charging, the direct current power supply Uc is externally connected at the time t =0, and the polarization current passing through the cable insulation layer of the cable 4 to be tested at this time can be expressed as:
in the formula, σ 0 Is the direct current conductivity of the XLPE insulating layer, δ (t) is the impulse function, since the impulse change of the current amplitude in the fast polarization process cannot be measured in practice, it is generally ignored, and there are:
when t = tc (tc is the charging time), the cable 4 to be tested is short-circuited to the ground, and the current flowing through the insulating layer is the depolarization current. According to the superposition theorem, voltage-Uc can be equivalently applied to XLPE insulation from the time t = tc, and a depolarization current expression can be obtained:
i depol ＝-C 0 U 0 [f(t)-f(t+t c )] (9)
since f (t) is a monotonically decreasing function, when tc is large, the second term on the right in the above equation can be ignored, and the approximation assumes that the depolarization current is proportional to the dielectric response function, namely:
therefore, when the test time is long enough, the dc conductivity of the XLPE insulation of the cable can be calculated by the joint (8) and (9):
in the formula, C 0 Insulating vacuum capacitor (or geometric capacitor) for electric cable)，U 0 Is a polarization voltage,. Epsilon 0 Is a vacuum dielectric constant (. Epsilon.) 0 ＝8.842×10 -12 F/m)，i pol For the polarisation current through the cable insulation, i depol Is a depolarizing current through the cable insulation.
For the specific polarization depolarization experiment of a certain tested cable, the polarization voltage U 0 May be set to a constant value. Thus, the DC conductivity σ of the cable 0 With average value of the polarization depolarization current only and cable capacitance C 0 It is relevant. For a particular cable under test, due to ε 0 、U 0 、C 0 The difference between the average values of the polarization depolarization currents, which is a constant value, is directly proportional to the difference between the average values of the polarization depolarization currents, and the difference between the average values of the polarization depolarization currents directly determines the magnitude of the electrical conductivity, which reflects the insulation performance of the cable, and the greater the difference or the greater the electrical conductivity, the more the insulation of the cable is aged.
(4) And comparing the insulation state table to judge the insulation state of the cable.
The diagnostic criteria for the insulation state table are:
sigma of the cable 0 &10E-16S/m, good insulation and no aging phenomenon;
sigma of the cable 0 >10E-16S/m，&10E-12, insulation is of concern, and aging is already present;
sigma of the cable 0 >, 10E-12S/m, serious defects exist in insulation, such as bridge water trees, a large number of micropores, integral aging, concentrated defects and the like.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (8)
1. A110 kV high-voltage cable detection method based on a polarization depolarization current method is characterized by comprising the following steps:
(1) Removing the outer sheath, the steel armor and the waterproof layer of the cable, exposing the cable core at two ends, then cutting off the outer semi-conducting layers at two ends, wrapping the remaining outer semi-conducting layers of the cable with copper layers, connecting the cable core into a high-voltage output end of a PDC testing system, and connecting the copper layers with a current testing module of the PDC testing system;
(2) The PDC testing system is divided into two processes of polarization and depolarization under the control of a Labview program, and the polarization current and the depolarization current of the cable are respectively collected;
(3) Analyzing and processing the polarization current and depolarization current collected in the step (2) to obtain the conductivity of the cable;
(4) And comparing the insulation state table to judge the insulation state of the cable.
2. The method for detecting the 110kV high-voltage cable based on the polarized and depolarized current method according to claim 1, wherein in step (1), 5cm of cable core is exposed from both ends of the cable, and 5cm of outer semi-conducting layer is cut from each end.
3. The method for detecting the 110kV high-voltage cable based on the polarized depolarization current method as claimed in claim 1, wherein the PDC testing system comprises a direct-current power supply module, a single-pole double-throw vacuum relay module, a current testing module, a current limiting resistor and an upper computer; the output end of the single-pole double-throw vacuum relay module is connected with a cable core of a cable to be tested through a current-limiting resistor, and a copper layer of the cable to be tested is connected with the input end of the current testing module; the input end of the single-pole double-throw vacuum relay module is connected with the output end of the direct-current power supply module; the upper computer is respectively connected with an RS232 serial port of the single-pole double-throw vacuum relay module and an RS232 serial port of the current testing module, and is respectively used for controlling the switching of the switches S1 and S2 of the single-pole double-throw vacuum relay module and receiving the current collected by the current testing module; the direct current power supply module, the single-pole double-throw vacuum relay module and the current testing module are grounded together.
4. The method for detecting the 110kV high-voltage cable based on the polarization depolarization current method according to claim 3, wherein the direct-current power supply module is a ZGF-120 type direct-current high-voltage generator which can provide 0-10kV direct-current voltage for the polarization depolarization process.
5. The method for detecting the 110kV high-voltage cable based on the polarized depolarized current method according to claim 3, wherein the single-pole double-throw vacuum relay module is in connection communication with an upper computer through an RS232 serial port.
6. The method for detecting the 110kV high-voltage cable based on the polarized depolarizing current method according to claim 3, wherein the current testing module adopts a programmable picoammeter.
7. The method for detecting the 110kV high-voltage cable based on the polarized depolarization current method as claimed in claim 1, wherein the cable conductivity in the step (3) is calculated by the following formula:
in the formula, C 0 Insulating vacuum capacitors, U, for cables 0 Is a polarization voltage,. Epsilon 0 Is a vacuum dielectric constant, i pol For the polarisation current passing through the cable insulation, i depol Is a depolarizing current through the cable insulation.
8. The method for detecting a 110kV high-voltage cable based on the polarized depolarization current method as claimed in claim 1, wherein the insulation state table is diagnosed according to the following steps:
sigma of the cable 0 &10E-16S/m, good insulation and no aging phenomenon;
sigma of the cable 0 >10E-16S/m，&10E-12, insulation is of concern, and aging is already present;
sigma of the cable 0 >, 10E-12S/m, serious insulation defects.
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| CN108627747A (en) * | 2018-08-23 | 2018-10-09 | 武汉脉源电气有限公司 | A kind of diagnostic model and its diagnostic method of the XLPE cable insulated water tree aging based on PDC methods |
| CN110231511A (en) * | 2019-07-05 | 2019-09-13 | 上海交通大学 | Isothermal relaxation current detection means based on separating and measuring loop method |
| CN110736905A (en) * | 2019-11-08 | 2020-01-31 | 国网重庆市电力公司江北供电分公司 | Insulation aging evaluation method for 110kV XLPE high-voltage cable |
| CN113295978A (en) * | 2021-06-09 | 2021-08-24 | 广东电网有限责任公司 | Cable detection device, method, terminal device and computer readable storage medium |
| CN113419147A (en) * | 2021-06-29 | 2021-09-21 | 广西电网有限责任公司电力科学研究院 | Radar spectrum diagram based visualized cable insulation state diagnosis and evaluation method |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627747A (en) * | 2018-08-23 | 2018-10-09 | 武汉脉源电气有限公司 | A kind of diagnostic model and its diagnostic method of the XLPE cable insulated water tree aging based on PDC methods |
| CN110231511A (en) * | 2019-07-05 | 2019-09-13 | 上海交通大学 | Isothermal relaxation current detection means based on separating and measuring loop method |
| CN110231511B (en) * | 2019-07-05 | 2021-06-29 | 上海交通大学 | Isothermal relaxation current detection device based on separation measurement loop method |
| CN110736905A (en) * | 2019-11-08 | 2020-01-31 | 国网重庆市电力公司江北供电分公司 | Insulation aging evaluation method for 110kV XLPE high-voltage cable |
| CN113295978A (en) * | 2021-06-09 | 2021-08-24 | 广东电网有限责任公司 | Cable detection device, method, terminal device and computer readable storage medium |
| CN113419147A (en) * | 2021-06-29 | 2021-09-21 | 广西电网有限责任公司电力科学研究院 | Radar spectrum diagram based visualized cable insulation state diagnosis and evaluation method |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
| CN114184905B (en) * | 2021-11-08 | 2022-07-08 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
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