CN107329061B - Submarine cable high-voltage insulation performance test system and determination method - Google Patents
Submarine cable high-voltage insulation performance test system and determination method Download PDFInfo
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- CN107329061B CN107329061B CN201710600354.3A CN201710600354A CN107329061B CN 107329061 B CN107329061 B CN 107329061B CN 201710600354 A CN201710600354 A CN 201710600354A CN 107329061 B CN107329061 B CN 107329061B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention discloses a submarine cable high-voltage insulation performance test system and a determination method, wherein the system comprises a voltage generating device, a voltage generating device and a submarine cable test device, wherein the voltage generating device outputs voltage meeting test requirements to the submarine cable, and the submarine cable is subjected to insulation assessment; the measuring device is used for measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking process of the submarine cable; the oil chromatography on-line monitor is used for measuring chromatographic data in the self insulating oil of the submarine cable after the insulation assessment of the submarine cable is completed; the data analysis device is connected with the measuring device and the oil chromatography on-line monitor and is used for receiving the measuring data transmitted by the measuring device and the oil chromatography on-line monitor and detecting whether the submarine cable has the electrified condition or not. By using the system, the insulation problem possibly occurring in the submarine cable operation can be found in advance, and the problem that the insulation performance of the submarine cable cannot be effectively checked due to the fact that the traditional insulation resistance is low in test voltage is solved.
Description
Technical Field
The invention relates to a submarine cable detection technology, in particular to a submarine cable high-voltage insulation performance test system and a submarine cable high-voltage insulation performance determination method.
Background
The sea area of 300 thousands square kilometers and the coastline of 18000 kilometers are owned in China, and 6000 islands are distributed along the coast. At present, the development and utilization of ocean resources in China are more and more important, and the development and utilization of national defense construction, sea island development, offshore wind power plants, ocean oil and gas resources and the like all need electric power support. The submarine power transmission cable engineering construction is an important component for promoting economic integration, adapting to national energy strategy planning, optimizing energy configuration and reducing environmental impact.
The 500kV submarine power cable crossing the straddling the strait of the Jongzhou is the first 500kV submarine cable in China by networking the south main network and the Hainan electric network. The cable adopts self-contained oil-filled cable, and its structural feature is that low-viscosity insulating oil is filled into the cable insulation, and oil supply equipment supplies a certain pressure to eliminate the possibility of air gap in the insulation. Before the alternating-current 500kV submarine cable is put into operation, insulation performance test needs to be carried out, the insulation performance of the submarine cable cannot be effectively checked due to low test voltage in the traditional insulation resistance, when the alternating-current withstand voltage mode is adopted for carrying out the handover test, the number of reactors to be compensated is large when the alternating-current withstand voltage is carried out due to large capacitance of the long-distance 500kV submarine cable, and the on-site alternating-current withstand voltage test is difficult to carry out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a test system and a test method for determining the high-voltage insulation performance of a bottom cable.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a submarine cable high-voltage insulation performance test system comprises
The voltage generating device comprises a voltage source, a transformer and a rectifying booster, wherein the positive electrode and the negative electrode of the voltage source are respectively connected with two ends of the primary side of the transformer, the rectifying booster is connected with two ends of the secondary side of the transformer in parallel, the output end of the rectifying booster is electrically connected with a submarine cable so as to output voltage meeting test requirements to the submarine cable, and the submarine cable is subjected to insulation assessment;
the measuring device is connected with the submarine cable and is used for measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking and examining process of the submarine cable;
the oil chromatography on-line monitor is connected with the submarine cable and is used for measuring chromatographic data in the insulating oil of the submarine cable after the insulativity test of the submarine cable is completed;
the data analysis device is connected with the measuring device and the oil chromatography on-line monitor and is used for receiving the measured data transmitted by the measuring device and the oil chromatography on-line monitor, and analyzing and comparing the received measured data with preset data so as to detect whether the submarine cable has the electrified condition.
The measuring device comprises a first resistor, a second resistor, a third resistor, a voltage measurer, a current measurer and a partial discharge measurer; the first resistor, the second resistor and the third resistor are sequentially connected in series, the input end of the first resistor is connected with the submarine cable, and the output end of the third resistor is grounded so as to reduce the voltage of the submarine cable to a voltage meeting the measurement requirement; the voltage measurer, the current measurer and the partial discharge measurer are respectively connected between the second resistor and the third resistor to respectively measure the voltage, the current and the partial discharge of the submarine cable in the insulation checking and examining process of the submarine cable.
The rectifying booster is formed by connecting a plurality of rectifying units in series, and the rectifying units are composed of two capacitors and loops formed by the two rectifiers.
The chromatographic data include methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide, carbon dioxide.
A method of determining the high voltage insulation properties of a submarine cable, the method comprising the steps of:
the voltage generating device applies voltage meeting the test requirement to the submarine cable according to the set time so as to check the insulation pressure resistance of the submarine cable;
the measuring device is used for measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking process of the submarine cable;
the oil chromatography on-line monitor measures chromatographic data in the oil of the submarine cable after the insulation assessment of the submarine cable is completed;
judging whether the submarine cable has the electrified condition according to the voltage, the current, the partial discharge and the chromatographic data measured by the measuring device and the oil chromatographic online monitor.
The voltage generating device is used for continuously pressurizing the submarine cable, the initial stage of pressurizing is regulated slowly, the middle stage is regulated rapidly and uniformly, and when the voltage value of the submarine cable exceeds 75% of the test required voltage value, the voltage regulating speed is not lower than 2%/second of the test required voltage value.
The condition for evaluating whether the submarine cable has electrification is as follows:
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the voltage value change range measured by the measuring device is +/-3%, the submarine cable is kept for 1 hour, and no destructive discharge and external flashover occur;
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the current value measured by the measuring device changes by +/-5%, and the time is kept for 1 hour;
the number of discharge pulses exceeding 2000PC measured by the measuring device is not more than 10 in the last 10 minutes of the insulation checking of the submarine cable;
after the submarine cable is subjected to insulation assessment, the total sum of methane, ethane, ethylene and acetylene in chromatographic data measured by an oil chromatography on-line monitor is less than 150uL/L, acetylene is less than 0.1uL/L, and hydrogen is less than 150uL/L;
if all the submarine cables satisfy the above conditions, it means that the submarine cables have the charged condition.
Compared with the prior art, the invention has the beneficial effects that:
the submarine cable high-voltage insulation performance test system can be used for finding out insulation problems possibly occurring in submarine cable operation in advance, solving the problem that the insulation performance of the submarine cable cannot be effectively checked due to low test voltage in the traditional insulation resistance, solving the problems that the long-distance 500kV submarine cable is large in capacitance, more in-situ alternating current voltage withstanding devices and difficult to work, and having important significance for effectively checking the high-voltage insulation performance of the 500kV submarine cable, reducing the in-situ test difficulty of the submarine cable and ensuring safe and stable operation of a power system.
Drawings
FIG. 1 is a schematic structural diagram of a submarine cable high-voltage insulation performance test system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a voltage generating device;
FIG. 3 is a schematic diagram of the structure of the measuring device;
FIG. 4 is a graph of voltage variation during a submarine cable test;
in the figure: 1. a voltage generating device; 2. a measuring device; 3. an oil chromatography on-line monitor; 4. a data analysis device; 5. a submarine cable; 21. a voltage measurer; 22. a current measurer; 23. and a partial discharge measurer.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Example 1
Referring to fig. 1, a schematic structural diagram of a submarine cable high-voltage insulation performance test system provided in this embodiment is shown, the system includes a voltage generating device 1, specifically, as shown in fig. 2, the voltage generating device includes a 380V dc voltage source, a transformer and a rectifying booster, wherein the positive pole and the negative pole of the dc voltage source are respectively connected with two ends of the primary side of the transformer, the rectifying booster is connected in parallel with two ends of the secondary side of the transformer, that is, a voltage value U1 output by the transformer will become an input voltage of the rectifying booster, the rectifying booster is formed by connecting a plurality of rectifying units in series, the number of rectifying units connected in series can be specifically set according to the requirement of boosting, in this embodiment, the rectifying booster is formed by connecting 50 rectifying units in series, and the rectifying unit is formed by a loop composed of 2 capacitors C and 2 rectifiers D, that is, the whole rectifying booster has 100 capacitors and 100 voltages, so that the voltage U1 output by the transformer is rectified into 100U1, thereby the voltage U1 output by the rectifying booster is in accordance with the insulation performance test requirement of the submarine cable in this embodiment, the voltage is not tested in the conventional submarine cable voltage test case, and the insulation performance test can be effectively solved. Meanwhile, the voltage generating device can achieve the following performance indexes: input power: AC380V + -10%, 50Hz + -1%; output voltage indication accuracy: stage 1; output current indication accuracy: stage 1; ripple coefficient: less than or equal to 0.5 percent; output voltage indication accuracy 0.75 times: < stage 1, with latch.
Specifically, in this embodiment, the transformer is a transformer of model S11-M-30/10 of henna, and the capacitor is a SE-2R5 capacitor of henna, and the rectifier is a CBRHDSH1-40L or CBRHDSH2-40 rectifier of Central Semiconductor.
Returning to fig. 1, a measuring device 2 is further connected to the submarine cable 5, and the measuring device 2 is used for measuring the voltage, current and partial discharge of the submarine cable 5 during the insulation test. The submarine cable is also connected with an oil chromatography on-line monitor 3, and the oil chromatography on-line monitor 3 adopts a ZF800-11 oil chromatography on-line monitor unit of Henan middle instruments Limited company, and is used for measuring chromatographic data in insulating oil of the submarine cable 5 after the submarine cable is subjected to insulation assessment (namely, the voltage generating device does not output voltage to the submarine cable any more), wherein the chromatographic data comprises methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide and carbon dioxide. The measuring device 2 and the oil chromatograph on-line monitor 3 are also connected to a data analysis device 4, respectively, and the data analysis device 4 is configured to receive the measurement data transmitted from the measuring device 2 and the oil chromatograph on-line monitor 3, and analyze and compare the received measurement data with the preset data to detect whether the submarine cable 5 has the charging condition (for a specific detection method, see example 2).
Therefore, the submarine cable high-voltage insulation performance test system can be used for finding out insulation problems possibly occurring in submarine cable operation in advance, solving the problem that the insulation performance of the submarine cable cannot be effectively checked due to low test voltage in the traditional insulation resistance, solving the problems that the long-distance 500kV submarine cable is large in capacitance, more in-situ alternating current voltage withstanding devices and difficult to work, and having important significance for effectively checking the high-voltage insulation performance of the 500kV submarine cable, reducing the in-situ test difficulty of the submarine cable and ensuring safe and stable operation of a power system.
Specifically, as shown in fig. 3, the measuring device 2 includes a first resistor R1, a second resistor R2, a third resistor R3, a voltage measurer 21, a current measurer 22, and a partial discharge measurer 23; the first resistor R1, the second resistor 42, and the third resistor R3 are sequentially connected in series, the input end of the first resistor R1 is connected with the submarine cable 5, the output end of the third resistor R3 is grounded, and the voltage measurer 21, the current measurer 22, and the partial discharge measurer 23 are respectively connected between the second resistor 42 and the third resistor R3, so as to respectively measure the voltage, the current, and the partial discharge of the submarine cable 5 in the insulation checking process. In this way, after the first resistor R1, the second resistor R2, and the third resistor R3 are sequentially reduced, the voltage of 600kv can be reduced to a measurement range of 5v or less, and the voltage measuring device 21, the current measuring device 22, and the partial discharge measuring device 23 can correspondingly measure the voltage, the current, and the change in the partial discharge amount of the submarine cable 5 during the insulation test and the assessment. In this embodiment, the first resistor R1 and the second resistor R2 are both of the BZ9/1 high-resistance standard resistor type of the Shanghai Chengyang instruments and meters, the third resistor R3 is of the BZ3 direct-current standard resistor of the Shanghai Chengyang instruments and meters, the voltage measurer 21 is of the JDZ1-1/JDZ2-1/JDZ3-1 voltage transformer of the josf company, the current measurer 22 is of the LYM-0.5 current transformer of the josf company, and the partial discharge measurer 23 is of the TWPD-2F partial discharge fault diagnosis and comprehensive analyzer of the baoding new domain technology development company.
Example 2
A method of determining the high voltage insulation properties of a submarine cable, the method comprising the steps of:
s1, applying a positive voltage of 600kv to the submarine cable according to a set time by a voltage generating device so as to check the insulation and voltage resistance of the submarine cable; specifically, the voltage generating device is the voltage generating device described in embodiment 1, and is continuously pressurized to a withstand voltage value (600 kv), the regulation in the initial stage of voltage regulation should be mild so as to prevent the charging current of the submarine cable from over-tripping the output current of the device, the voltage regulation in the middle stage should be fast and uniform, and when the voltage exceeds 75% of the test voltage 600kv, the voltage regulation speed should not be lower than 2%/second of 600kv, so as to avoid excessively long withstand voltage time of the submarine cable when approaching the test voltage. The specific test pressurization curve is shown in fig. 4, wherein t1 is the time taken by the voltage on the submarine cable from zero to the test voltage, the time is not more than 2 minutes, and t2 is the withstand voltage time of the tested equipment for 1 hour, namely 60 minutes.
S2, measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking process by using the measuring device, wherein the measuring device is specifically the measuring device described in the embodiment 1.
S3, measuring chromatographic data in the submarine cable oil by using an oil chromatography on-line monitor after the insulation check of the submarine cable is completed, wherein the oil chromatography on-line monitor is specifically the oil chromatography on-line monitor described in the embodiment 1.
S4, judging whether the submarine cable has the electrification condition according to the voltage, the current, the partial discharge and the chromatographic data measured in the steps S2 and S3, wherein the method specifically comprises the following steps:
when the voltage value of the submarine cable reaches the voltage value (namely 600 kv) meeting the test requirement, the voltage value measured by the voltage measurer changes in a range of +/-3 percent, and the submarine cable is kept for 1 hour continuously, so that destructive discharge and external flashover do not occur;
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the current value measured by the current measurer changes in a range of +/-5%, and the time is kept for 1 hour;
the number of discharge pulses exceeding 2000PC measured by the partial discharge measurer is not more than 10 in the last 10 minutes of the insulation checking of the submarine cable;
after the submarine cable is subjected to insulation assessment, the total sum of methane, ethane, ethylene and acetylene in chromatographic data measured by an oil chromatography on-line monitor is less than 150uL/L, acetylene is less than 0.1uL/L, and hydrogen is less than 150uL/L;
if all the submarine cables meet the conditions, the submarine cables are provided with charged conditions; otherwise the submarine cable is not particularly charged.
Therefore, the insulation problem possibly occurring in the submarine cable operation can be found in advance by applying the method, the problem that the insulation performance of the submarine cable cannot be effectively checked due to low test voltage in the traditional insulation resistance is solved, the problems that the capacitance of the long-distance 500kV submarine cable is large, the field alternating current voltage withstanding device is more and the working is difficult are solved, and the method has important significance for effectively checking the high-voltage insulation performance of the 500kV submarine cable, reducing the field test difficulty of the submarine cable and ensuring safe and stable operation of a power system.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A submarine cable high-voltage insulation performance test system is characterized by comprising
The voltage generating device comprises a voltage source, a transformer and a rectifying booster, wherein the positive electrode and the negative electrode of the voltage source are respectively connected with two ends of the primary side of the transformer, the rectifying booster is connected with two ends of the secondary side of the transformer in parallel, the output end of the rectifying booster is electrically connected with a submarine cable so as to output voltage meeting test requirements to the submarine cable, and the submarine cable is subjected to insulation assessment;
the measuring device is connected with the submarine cable and is used for measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking and examining process of the submarine cable;
the oil chromatography on-line monitor is connected with the submarine cable and is used for measuring chromatographic data in the insulating oil of the submarine cable after the insulativity test of the submarine cable is completed;
the data analysis device is connected with the measuring device and the oil chromatography on-line monitor and is used for receiving the measuring data transmitted by the measuring device and the oil chromatography on-line monitor, and analyzing and comparing the received measuring data with preset data so as to detect whether the submarine cable has an electrified condition;
the voltage generating device is used for continuously pressurizing the submarine cable, the initial stage of pressurizing is regulated slowly, the middle stage is regulated rapidly and uniformly, and when the voltage value of the submarine cable exceeds 75% of the test required voltage value, the voltage regulating speed is not lower than 2%/second of the test required voltage value;
the condition for judging whether the submarine cable has electrification is as follows:
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the voltage value change range measured by the measuring device is +/-3%, the submarine cable is kept for 1 hour, and no destructive discharge and external flashover occur;
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the current value measured by the measuring device changes by +/-5%, and the time is kept for 1 hour;
the number of discharge pulses exceeding 2000PC measured by the measuring device is not more than 10 in the last 10 minutes of the insulation checking of the submarine cable;
after the submarine cable is subjected to insulation assessment, the total sum of methane, ethane, ethylene and acetylene in chromatographic data measured by an oil chromatography on-line monitor is less than 150uL/L, acetylene is less than 0.1uL/L, and hydrogen is less than 150uL/L;
if all the submarine cables satisfy the above conditions, it means that the submarine cables have the charged condition.
2. The submarine cable high-voltage insulation performance test system according to claim 1, wherein the measuring device comprises a first resistor, a second resistor, a third resistor, a voltage measurer, a current measurer and a partial discharge measurer; the first resistor, the second resistor and the third resistor are sequentially connected in series, the input end of the first resistor is connected with the submarine cable, and the output end of the third resistor is grounded so as to reduce the voltage of the submarine cable to a voltage meeting the measurement requirement; the voltage measurer, the current measurer and the partial discharge measurer are respectively connected between the second resistor and the third resistor to respectively measure the voltage, the current and the partial discharge of the submarine cable in the insulation checking and examining process of the submarine cable.
3. The submarine cable high-voltage insulation performance test system according to claim 1, wherein the rectifying booster is formed by connecting a plurality of rectifying units in series, and the rectifying units are composed of loops formed by two capacitors and two rectifiers.
4. The submarine cable high-voltage insulation performance test system according to claim 1, wherein the chromatographic data comprises methane, ethane, ethylene, acetylene, hydrogen, carbon monoxide, carbon dioxide.
5. A method of determining the high voltage insulation properties of a submarine cable, the method comprising the steps of:
the voltage generating device applies voltage meeting the test requirement to the submarine cable according to the set time so as to check the insulation pressure resistance of the submarine cable;
the measuring device is used for measuring the voltage, the current and the partial discharge of the submarine cable in the insulation checking process of the submarine cable;
the oil chromatography on-line monitor measures chromatographic data in the oil of the submarine cable after the insulation assessment of the submarine cable is completed;
judging whether the submarine cable has charged conditions according to the voltage, the current, the partial discharge and the chromatographic data measured by the measuring device and the oil chromatographic online monitor;
the voltage generating device is used for continuously pressurizing the submarine cable, the initial stage of pressurizing is regulated slowly, the middle stage is regulated rapidly and uniformly, and when the voltage value of the submarine cable exceeds 75% of the test required voltage value, the voltage regulating speed is not lower than 2%/second of the test required voltage value;
the condition for evaluating whether the submarine cable has electrification is as follows:
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the voltage value change range measured by the measuring device is +/-3%, the submarine cable is kept for 1 hour, and no destructive discharge and external flashover occur;
when the voltage value of the submarine cable reaches the voltage value meeting the test requirement, the current value measured by the measuring device changes by +/-5%, and the time is kept for 1 hour;
the number of discharge pulses exceeding 2000PC measured by the measuring device is not more than 10 in the last 10 minutes of the insulation checking of the submarine cable;
after the submarine cable is subjected to insulation assessment, the total sum of methane, ethane, ethylene and acetylene in chromatographic data measured by an oil chromatography on-line monitor is less than 150uL/L, acetylene is less than 0.1uL/L, and hydrogen is less than 150uL/L;
if all the submarine cables satisfy the above conditions, it means that the submarine cables have the charged condition.
6. The method of determining the high voltage insulation performance of a submarine cable according to claim 5, wherein the measuring device comprises a first resistor, a second resistor, a third resistor, a voltage measurer, a current measurer and a partial discharge measurer; the first resistor, the second resistor and the third resistor are sequentially connected in series, the input end of the first resistor is connected with the submarine cable, and the output end of the third resistor is grounded so as to reduce the voltage of the submarine cable to a voltage meeting the measurement requirement; the voltage measurer, the current measurer and the partial discharge measurer are respectively connected between the second resistor and the third resistor to respectively measure the voltage, the current and the partial discharge of the submarine cable in the insulation checking and examining process of the submarine cable.
7. The method for determining the high-voltage insulation performance of the submarine cable according to claim 5, wherein the voltage generating device comprises a voltage source, a transformer and a rectification booster, wherein the positive electrode and the negative electrode of the voltage source are respectively connected with two ends of the primary side of the transformer, the rectification booster is connected with two ends of the secondary side of the transformer in parallel, the output end of the rectification booster is electrically connected with the submarine cable so as to output voltage meeting test requirements to the submarine cable, and the submarine cable is subjected to insulation assessment;
8. the method for determining high voltage insulation performance of submarine cable according to claim 6, wherein the rectifying booster is formed by connecting a plurality of rectifying units in series, and the rectifying units are composed of loops formed by two capacitors and two rectifiers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207081804U (en) * | 2017-07-21 | 2018-03-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of submarine cable high-voltage isulation performance test system |
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