CN210803634U - Cable buffer layer testing arrangement - Google Patents
Cable buffer layer testing arrangement Download PDFInfo
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- CN210803634U CN210803634U CN201920293654.6U CN201920293654U CN210803634U CN 210803634 U CN210803634 U CN 210803634U CN 201920293654 U CN201920293654 U CN 201920293654U CN 210803634 U CN210803634 U CN 210803634U
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- 238000012360 testing method Methods 0.000 title claims abstract description 149
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000013522 software testing Methods 0.000 description 1
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Abstract
The utility model discloses a cable buffer layer testing device, which comprises a voltage testing unit for simulating a testing loop of voltage in a cable system; the current testing unit is used for simulating a testing loop of current in the cable system; the change-over switch is used for converting the voltage test loop and the current test loop; and an interface at one end of the change-over switch is connected with the voltage test unit or the current test unit, and the other end of the change-over switch is connected with one end of the cable core. The utility model discloses a set up the built-up connection of voltage test unit and current test unit, develop the test of cable buffer layer insulating state under the various operating mode conditions, through setting up open-close type adapter, realize the fast switch-over in voltage return circuit and current return circuit, can effectively shorten test time, improve cable buffer layer test efficiency.
Description
Technical Field
The utility model relates to a high voltage power equipment insulation test technical field, concretely relates to cable buffer layer testing arrangement.
Background
The cable plays an increasingly important role in accelerating the development of a power grid and enhancing the urban power supply guarantee. In recent years, dozens of high-voltage crosslinked polyethylene insulated cable faults caused by buffer layer defects occur in Zhejiang, Guangzhou, Fujian, Beijing, Shanghai, Xinjiang and other areas, similar reports are also reported in foreign Singapore and Australia, and even when the faults are serious, the insulation shielding layer completely penetrates, so that the insulation breakdown of the cable is caused, and the power failure accident is caused, so that the significance of ensuring the safe and stable operation of the cable is very important.
In the prior art, the detection and evaluation indexes of the cable buffer layer are not specified relatively, the laboratory evaluation technology for detecting the performance of the cable buffer layer is not mature, and the quantitative measurement and evaluation standard of the material performance is lacked.
Disclosure of Invention
For solving the problem that proposes in the above-mentioned background art, the utility model provides a cable buffer layer testing arrangement through the built-up connection who sets up voltage test unit and current test unit, realizes the detection of indexes such as voltage, electric current, examines test platform simultaneously and sets up change over switch, can effectively shorten test time, improves cable buffer layer efficiency of software testing.
The utility model provides a cable buffer layer testing device, which comprises a voltage testing unit, a voltage testing unit and a testing unit, wherein the voltage testing unit is used for simulating a testing loop of voltage in a cable system; the current testing unit is used for simulating a testing loop of current in the cable system; the change-over switch is used for converting the voltage test loop and the current test loop; and an interface at one end of the change-over switch is connected with the voltage test unit or the current test unit, and the other end of the change-over switch is connected with one end of the cable core.
As an alternative, the voltage test unit includes: the voltage generator, the voltage divider, the conducting rod and the connecting wire; the voltage divider is connected with the voltage generator through the conducting rod, and the voltage divider is connected with a first interface at one end of the change-over switch through the connecting wire.
As an alternative, the voltage generator comprises a waveform selector, a measurement control system and a voltage output system; the waveform selector is connected with one end of the measurement control system; and the other end of the measurement control system is connected with the voltage output system.
As an alternative, the current testing unit comprises a rigid connecting rod, one end of the rigid connecting rod is connected with the second interface at one end of the change-over switch, and the other end of the rigid connecting rod is electrically connected with the cable terminal; the other end of the cable core is electrically connected with the cable terminal through a cable.
As an alternative, the cable core and the other end are provided with a metal flange, and the cable core is connected with the cable through the metal flange; the metal flange is also connected with a grounding wire.
As an alternative, the testing device further comprises a state detection module, an offline testing module, a current booster and a sensor; the current booster is arranged on the cable; the sensor is arranged on the grounding wire; the state monitoring module is connected with the sensor; the offline test module is connected with the voltage divider; the state detection module comprises partial discharge test data, cable conductor temperature test data, leakage current test data and dielectric loss test data; the off-line test module comprises partial discharge test data, insulation resistance test data and dielectric loss test data.
As an alternative, the testing device further comprises a metal shielding case, and the switch is arranged in the metal shielding case.
As an alternative, the change-over switch is an open-close type adapter, and the open-close type adapter comprises a fixing piece, a rotating shaft body, a cylindrical interface, a square interface, a cable interface and a bolt hole; the fixed piece is movably connected with the rotating piece through a rotating shaft body; and the fixing piece and the rotating piece are tightly connected through a bolt matched with the bolt hole.
The utility model provides a cable buffer layer test method in the second aspect, determine the test type; setting the cable buffer layer testing device according to the testing type; and recording test data and obtaining a test result according to the test data.
As an alternative, the test types include a voltage test or/and a current test, an off-line test or/and an on-line status test.
The utility model has the advantages that: the utility model discloses a set up the built-up connection of voltage test unit and current test unit, develop the test of cable buffer layer insulating state under the various operating mode conditions, through setting up open-close type adapter, realize the fast switch-over in voltage return circuit and current return circuit, can effectively shorten test time, improve cable buffer layer test efficiency.
Drawings
Fig. 1 is a schematic overall structure diagram of a cable buffer layer testing device according to an embodiment of the present invention;
the device comprises a voltage generator 1, a voltage divider 2, a conductive rod 3, a connecting wire 4, a rigid connecting rod 5, a metal shielding cover 6, an open-close type adapter 7A, an open-close type adapter 7B, a cable core 8, a metal flange 9, a cable 10, a cable terminal 11, a current booster 12, a grounding wire 13, a state detection platform 14, a sensor 15 and an offline test platform 16, wherein the state detection platform comprises a first state detection platform, a second state detection platform and a third state detection platform;
fig. 2 is a schematic diagram of a voltage generator assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an opening/closing adapter according to an embodiment of the present invention;
the connector comprises 71-an open-close type adapter fixing piece, 72-an open-close type adapter rotating piece, 73-a rotating shaft body, 74-a cylindrical interface, 75-a square interface, 76-a cable interface and 77-a bolt hole;
fig. 4 is a schematic view of the cable structure of the present invention;
wherein, 17-cable buffer layer, 18-corrugated aluminum sheath, and 19-cable sheath
Fig. 5 is a flow chart of a method for testing the performance of a cable buffer layer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings in conjunction with specific embodiments.
Example one
Please refer to fig. 1, an embodiment of the present invention provides a cable buffer layer testing apparatus, which includes a voltage generator 1, a voltage divider 2, a conductive rod 3, a connecting wire 4, a rigid connecting rod 5, a metal shielding cover 6, an open-close type adapter 7A, a cable core 8, a metal flange 9, a cable 10, a cable terminal 11, a current rising device 12, a grounding wire 13, a state detection platform 14, a sensor 15, and an offline test platform 16, wherein the rigid connecting rod 5 is connected with the cable terminal 11 through the open-close type adapter 7B.
Different test modes of the cable system are realized through the connection mode of the setting device, wherein the test loop device for simulating the voltage in the cable system is connected as follows:
the conducting rod 3 is respectively connected with the voltage generator 1 and the voltage divider 2, the voltage divider 2 is connected with the open-close type adapter 7 through the connecting wire 4, the other end of the open-close type adapter 7A is rigidly and electrically connected with the cable core 8, and a complete voltage test loop is formed by the metal flange 9, the grounding wire 13 connected with the metal flange, the cable 10 and the cable terminal 11.
Referring to fig. 2, the voltage generator is composed of a waveform selector, a measurement control system and a voltage output system, and can output a power frequency voltage, an oscillation wave voltage, a lightning wave voltage and an operation wave voltage according to a test requirement. Wherein the frequency of the power frequency voltage is 49-61 Hz, and the waveform is basically sine wave; the wave front time of the lightning wave is 1' 5 microseconds, and the half-wave peak time is 50 +/-10 microseconds.
Preferably, the testing device is connected with a cable buffer layer offline detection module, and the cable buffer layer offline detection module comprises partial discharge test data, insulation resistance test data and dielectric loss test data.
Preferably, the testing device is connected with a cable buffer layer insulation state detection module, and the cable buffer layer insulation state detection module comprises test data for detecting partial discharge, test data for cable conductor temperature, test data for leakage current and test data for dielectric loss.
Preferably, the open-close type adapter 7A and the open-close type adapter 7B are arranged in the metal shielding cover, so that corona interference in the voltage test process is prevented.
When the voltage testing loop is communicated, the opening-closing type adapter fixing piece 71 and the opening-closing type adapter rotating piece 72 are opened through the bolt hole 77 and the rotating shaft body 73, the connecting wire 4 is installed in the square interface 75, the cable interface 76 is communicated with the cable core 8, then the opening-closing type adapter fixing piece 71 and the opening-closing type adapter rotating piece 72 are closed, and the bolts are used for fixing.
The test loop device for simulating the current in the cable system is connected as follows:
the rigid connecting rod 5 is respectively connected with an opening-closing type adapter 7A and an opening-closing type adapter 7B at two ends of a tested cable loop, the other end of the opening-closing type adapter 7A is connected with a cable core 8, the other end of the opening-closing type adapter 7B is rigidly and electrically connected with a cable terminal 11, and a complete current test loop is formed by a metal flange 9 and a grounding wire 13 and a cable 10 which are connected with the metal flange.
When the current test loop is communicated, the opening-closing type adapter fixing piece 71 and the opening-closing type adapter rotating piece 72 are opened through the bolt hole 77 and the rotating shaft body 73, the cable interface 76 is kept to be communicated with the cable core 8, the connecting wire 4 is detached, the rigid connecting rod 5 is installed in the cylindrical interface 74, and then the opening-closing type adapter fixing piece 71 and the opening-closing type adapter rotating piece 72 are closed and fixed through bolts.
Referring to fig. 4, a typical structure of the cable 10 used in the present embodiment is shown, wherein a cable buffer layer 17 is located between the cable core 8 and the corrugated aluminum sheath 18, and a cable sheath 19 is wrapped outside the corrugated aluminum sheath 18.
Example two
The cable buffer layer testing device is applied, and the concrete working steps are as follows: (1) determining the type of the cable buffer layer test, including a voltage test or/and a current test, an off-line test or/and a live test; (2) formulating a cable buffer layer test scheme, including test voltage/current values, offline/electrified test time, a wiring method and the like; (3) the test loop is connected with the test platform; (4) starting the test work of the cable buffer layer; (5) evaluating test results including effectiveness, accuracy and reliability; (6) all test jobs are ended.
Taking a partial discharge test for measuring power frequency voltages at different temperatures as an example, the test method comprises the following steps: the off-line detection equipment selects a pulse current method partial discharge tester, firstly, a current test loop is formed by a rigid connecting rod 5, a metal shielding cover 6, an open-close type adapter 7, a cable core 8, a metal flange 9, a cable 10, a cable terminal 11, a current booster 12 and a grounding wire 13, the current in a cable system is simulated, so that the temperature of the cable core reaches the preset temperature, then, the rigid connecting rod 5 is rapidly dismantled through the open-close type adapter 7 to be connected with the connecting wire 4, a voltage testing loop is formed through the voltage generator 1, the voltage divider 2, the conducting rod 3, the connecting wire 4, the metal shielding cover 6, the open-close type adapter 7A, the cable core 8, the metal flange 9, the cable 10, the cable terminal 11 and the grounding wire 13, the power frequency voltage is selected and output through the voltage generator 1, and detecting the partial discharge amount of the buffer layer of the tested cable through a partial discharge tester under corresponding voltage.
Further, in the off-line partial discharge test, the test voltage should be gradually increased to 1.75U0And remained for 10s, then slowly decreasedTo 1.5U0At 1.5U0Next, the partial discharge amount detected in the cable to be tested was less than 10 pC.
Furthermore, the combination state detection module collects the test data and waveforms of charged partial discharge, leakage current and dielectric loss when an offline partial discharge test is carried out, and the insulation state of the tested cable buffer layer is analyzed in a multi-angle mode.
Furthermore, the off-line testing method using the testing device can be replaced by an insulation resistance test and a dielectric loss test. The insulation resistance test can adopt insulation resistance test equipment such as a power analyzer and a multimeter, and the dielectric loss test can adopt an insulation diagnosis analyzer IDAX-300D or other equipment with the same function.
The cable buffer layer testing method provided by the embodiment is an offline partial discharge testing scene. Other off-line and status testing processes are as described above and will not be described herein.
The above technical solution and the accompanying drawings provided in the embodiments of the present invention are used for further explanation but not limitation of the present invention, and it should be noted that, as one skilled in the art should know, the technical solution described in the foregoing embodiments can still be modified, or some or all of the technical features therein can be equivalently replaced, and these modifications or replacements do not make the essence of the corresponding technical solution depart from the scope of the technical solution of the present invention.
The above description is only exemplary of the invention and is not intended to limit the invention, and any modifications, equivalent alterations, improvements and the like which are made within the spirit and principle of the invention are all included in the scope of the claims which are appended hereto.
Claims (7)
1. A cable buffer layer testing device, the testing device comprising:
the voltage testing unit is used for simulating a testing loop of voltage in the cable system;
the current testing unit is used for simulating a testing loop of current in the cable system;
the change-over switch is used for converting the voltage test loop and the current test loop;
an interface at one end of the change-over switch is connected with the voltage testing unit or the current testing unit, and the other end of the change-over switch is connected with one end of the cable core;
the voltage test unit includes:
the voltage generator, the voltage divider, the conducting rod and the connecting wire;
the voltage divider is connected with the voltage generator through the conducting rod, and the voltage divider is connected with a first interface at one end of the change-over switch through the connecting wire.
2. The cable buffer testing device of claim 1,
the voltage generator comprises a waveform selector, a measurement control system and a voltage output system;
the waveform selector is connected with one end of the measurement control system;
and the other end of the measurement control system is connected with the voltage output system.
3. The cable buffer layer testing device of claim 1 or 2, wherein the current testing unit comprises a rigid connecting rod, one end of the rigid connecting rod is connected with the second interface at one end of the switch, and the other end of the rigid connecting rod is electrically connected with a cable terminal;
the other end of the cable core is electrically connected with the cable terminal through a cable.
4. The cable buffer layer testing device according to claim 3, wherein a metal flange is provided at the other end of the cable core, and the cable core is connected with the cable through the metal flange;
the metal flange is also connected with a grounding wire.
5. The cable buffer layer testing device of claim 4, wherein the testing device further comprises a state detection module, an offline testing module, a current booster and a sensor;
the current booster is arranged on the cable;
the sensor is arranged on the grounding wire;
the state monitoring module is connected with the sensor;
the offline test module is connected with the voltage divider;
the state detection module comprises partial discharge test data, cable conductor temperature test data, leakage current test data and dielectric loss test data;
the off-line test module comprises partial discharge test data, insulation resistance test data and dielectric loss test data.
6. The cable buffer layer testing device according to claim 1 or 2, wherein the testing device further comprises a metal shielding case, and the switch is disposed in the metal shielding case.
7. The cable buffer layer testing device of claim 1 or 2, wherein the switch is an open-close type adapter, and the open-close type adapter comprises a fixing member, a rotating shaft body, a cylindrical interface, a square interface, a cable interface and a bolt hole;
the fixed piece is movably connected with the rotating piece through a rotating shaft body;
and the fixing piece and the rotating piece are tightly connected through a bolt matched with the bolt hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920293654.6U CN210803634U (en) | 2019-03-08 | 2019-03-08 | Cable buffer layer testing arrangement |
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| CN201920293654.6U CN210803634U (en) | 2019-03-08 | 2019-03-08 | Cable buffer layer testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738764A (en) * | 2019-03-08 | 2019-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of cable slack layer test device and test method |
| CN113552455A (en) * | 2021-07-26 | 2021-10-26 | 广东电网有限责任公司广州供电局 | Online testing method for divided voltage of power cable buffer layer |
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2019
- 2019-03-08 CN CN201920293654.6U patent/CN210803634U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738764A (en) * | 2019-03-08 | 2019-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of cable slack layer test device and test method |
| CN113552455A (en) * | 2021-07-26 | 2021-10-26 | 广东电网有限责任公司广州供电局 | Online testing method for divided voltage of power cable buffer layer |
| CN113552455B (en) * | 2021-07-26 | 2023-11-17 | 广东电网有限责任公司广州供电局 | Online testing method for voltage division of buffer layer of power cable |
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