CN107356824B - Submarine cable direct-current withstand voltage test charge accumulation measurement system and measurement method - Google Patents
Submarine cable direct-current withstand voltage test charge accumulation measurement system and measurement method Download PDFInfo
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- CN107356824B CN107356824B CN201710601574.8A CN201710601574A CN107356824B CN 107356824 B CN107356824 B CN 107356824B CN 201710601574 A CN201710601574 A CN 201710601574A CN 107356824 B CN107356824 B CN 107356824B
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Abstract
The invention discloses a submarine cable direct-current withstand voltage test charge accumulation measurement system and a measurement method, wherein the system comprises a voltage generating device, a voltage measuring device and a voltage measuring device, wherein the voltage generating device outputs positive-polarity voltage meeting test requirements to a submarine cable; the voltage measuring device is electrically connected with the submarine cable and is used for measuring the voltage value change of the submarine cable; the submarine cable insulation paper conductivity measuring device is connected with the submarine cable insulation paper sample and is used for measuring the conductivity of submarine cable insulation paper; a submarine cable insulating oil conductivity measuring device for measuring the conductivity of submarine cable insulating oil; and an arithmetic processing device for calculating the accumulated charge of the submarine cable according to the conductivity of the submarine cable insulating paper and the conductivity of the submarine cable insulating oil. The system can solve 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, and can also solve the calculation problem of charge accumulation after the test of the submarine cable with the long-distance 500 kV.
Description
Technical Field
The invention relates to the field of submarine cable testing, in particular to a submarine cable direct-current withstand voltage test charge accumulation measurement system and a measurement 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 the self-contained oil-filled cable, and its structural feature is that the cable insulation is filled with low-viscosity insulating oil, and the cable insulation is also provided with insulating paper. And a certain pressure is supplied by the oil supply device to eliminate the possibility of air gaps generated inside 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. At present, an effective method for calculating charge accumulation caused by a test process exists after the field insulation voltage withstand test, so that blindness exists in the discharging work after the submarine cable voltage withstand test is finished, and damage to test personnel and equipment is likely to occur.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a system and a method for testing the insulation performance of a direct current withstand voltage test of a submarine cable and measuring the charge accumulation of the submarine cable after the test.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a submarine cable DC withstand voltage test charge accumulation measurement system comprises
The voltage generating device comprises a direct-current voltage source, a transformer and a rectification booster, wherein the positive electrode and the negative electrode of the direct-current 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, and the output end of the rectification booster is electrically connected with a submarine cable so as to output positive voltage meeting test requirements to the submarine cable;
the voltage measuring device is electrically connected with the submarine cable and is used for measuring the voltage value change of the submarine cable;
the submarine cable insulation paper conductivity measuring device is connected with the submarine cable insulation paper sample and is used for measuring the conductivity of submarine cable insulation paper;
a submarine cable insulating oil conductivity measuring device for measuring the conductivity of submarine cable insulating oil;
and an arithmetic processing device for calculating the accumulated charge of the submarine cable according to the conductivity of the submarine cable insulating paper and the conductivity of the submarine cable insulating oil.
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 voltage measuring device comprises a first resistor, a second resistor, a third resistor and a voltage 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 is connected between the second resistor and the third resistor to measure the voltage value change of the submarine cable.
The submarine cable insulation paper conductivity measuring device comprises a direct current power supply, an ammeter, a protected electrode, a protection electrode, an unprotected electrode and an insulation paper sample; one surface of the insulating paper sample is contacted with the unprotected electrode, the other surface of the insulating paper sample is contacted with the protected electrode and the protected electrode, and the protected electrodes are arranged on two sides of the protected electrode; the positive electrode of the direct current power supply is electrically connected with the unprotected electrode, the negative electrode is electrically connected with the protected electrode, and the ammeter is connected and installed between the positive electrode of the direct current power supply and the protected electrode; wherein, a protection electrode and a negative electrode of the direct current power supply are grounded.
The submarine cable insulating oil conductivity measurement device comprises a cylindrical outer electrode, an inner electrode arranged in the outer electrode, and an insulating oil filling channel formed by a gap between the outer electrode and the inner electrode, wherein an exhaust hole is formed in the inner electrode so as to prevent pressure formed by insulating oil gas generated in the insulating oil filling channel to the inside of the insulating oil filling channel; a temperature measuring hole is formed in the inner electrode for measuring the temperature of the insulating oil; an insulating plate is connected and installed between the upper ends of the inner electrode and the outer electrode so as to electrically insulate the inner electrode and the outer electrode; a shielding ring is arranged on the lower surface of the insulating plate so as to lead the electric field at the ends of the inner electrode and the outer electrode to be uniform; a shielding cap is installed on the upper surface of the insulating plate to shield external electromagnetic interference; the external electrode and the internal electrode are respectively and electrically connected with the positive electrode and the negative electrode of the direct current power supply, and an ammeter is connected and installed between the negative electrode and the internal electrode of the direct current power supply.
The arithmetic processing device calculates the accumulated charge Q of the bottom cable by the following formula:
Q＝J×A×D
wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time when the voltage generating device applies positive polarity voltage meeting the test requirement to the submarine cable; γ1 is the conductivity of the submarine cable insulation paper; γ2 is the conductivity of the submarine cable insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the length of the submarine cable.
A method of measuring charge accumulation in a direct current withstand voltage test of a submarine cable, the method comprising the steps of:
measuring the insulation paper conductivity gamma 1 of the submarine cable and the insulation oil conductivity gamma 2 of the submarine cable respectively by using a submarine cable insulation paper conductivity measuring device and a submarine cable insulation oil conductivity measuring device;
the voltage generating device applies positive 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;
obtaining the accumulated charge Q of the submarine cable according to the following formula
Q＝J×A×D
Wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time when the voltage generating device applies positive polarity voltage meeting the test requirement to the submarine cable;γ1 is the conductivity of the insulating paper; γ2 is the conductivity of the insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the length of the submarine cable.
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.
Compared with the prior art, the invention has the beneficial effects that:
the submarine cable direct-current withstand voltage test charge accumulation measurement system can effectively check the high-voltage insulation performance of alternating-current 500kV submarine cables, overcome the problem that the insulation performance of the submarine cables cannot be effectively checked due to low test voltage in the traditional insulation resistance, and solve the calculation problem of charge accumulation after a long-distance 500kV submarine cable is tested, so that the submarine cable insulation withstand voltage discharging operation can be effectively guided, the system has important significance for safe and stable operation of a power system, has important technical support for power supply guarantee, and brings great economic benefit.
Drawings
FIG. 1 is a schematic diagram of a charge accumulation measurement system for a DC withstand voltage test of a submarine cable 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 a voltage measurement device;
FIG. 4 is a schematic structural view of a submarine cable insulation paper conductivity measuring device;
FIG. 5 is a schematic structural view of a submarine cable insulating oil conductivity measuring device;
FIG. 6 is a graph of voltage variation during a submarine cable test;
in the figure: 1. a voltage generating device; 2. a voltage measuring device; 3. submarine cable insulation paper conductivity measuring device; 4. submarine cable insulating oil conductivity measuring device; 5. an arithmetic processing device; 6. a submarine cable; 21. a voltage measurer; 31. an insulating paper sample; 32. the electrode is not protected; 33. a protected electrode; 34. protecting the electrode; 51. an external electrode; 52. an inner electrode; 53. insulating oil fills the channels; 54. an exhaust hole; 55. an insulating plate; 56. a shielding ring; 57. a shielding cap.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description.
Examples:
example 1
As shown in fig. 1, the charge accumulation measurement system for direct-current withstand voltage test of a submarine cable provided in this embodiment includes a voltage generating device 1, specifically, as shown in fig. 2, the voltage generating device includes a 380V direct-current voltage source, a transformer and a rectifying booster, wherein the positive pole and the negative pole of the direct-current 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, the voltage value U1 output by the transformer will become the 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 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 connecting 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 outputting a voltage meeting the insulation test requirement for the submarine cable, in this embodiment, the voltage can not be effectively tested in the insulation test of the submarine cable, and the insulation test can be effectively lowered in the submarine cable 600. 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.
In addition, in order to effectively solve the problem of charge accumulation calculation caused by the submarine cable in the test process of insulation performance assessment, the submarine cable 6 is electrically connected with a voltage measuring device 2 for measuring the voltage change in the test process of the submarine cable 6, and as the submarine cable is connected with a voltage of up to 600kV, a common voltage measuring instrument cannot measure the voltage change of the submarine cable, and as shown in fig. 3, the voltage measuring device 2 of the application consists of a first resistor R1, a second resistor R2, a third resistor R3 and a voltage measurer 21; the first resistor R1, the second resistor R2 and the third resistor R3 are sequentially connected in series, the input end of the first resistor R1 is connected with the submarine cable, the output end of the third resistor R2 is grounded, the input end of the voltage measurer 21 is connected between the second resistor R2 and the third resistor R3, and the output end of the voltage measurer is grounded, so that after the voltage of the first resistor R1, the second resistor R2 and the third resistor R3 is sequentially reduced, the voltage of 600kV can be reduced to a measuring range below 5v, the voltage measurer 21 can measure the voltage change of the submarine cable in the insulation test withstand voltage checking process, and then the actual voltage change value of the submarine cable can be calculated in a back-pushing manner according to the resistance values of the first resistor R1, the second resistor R2 and the third resistor R2. Specifically, the first resistor R1 and the second resistor R2 are both of the type BZ9/1 high-resistance standard resistor of Shanghai Chengyang instruments and meters, the third resistor R3 is of the type BZ3 direct-current standard resistor of Shanghai Chengyang instruments and meters, and the voltage measurer 21 is of the type JDZ1-1/JDZ2-1/JDZ3-1 voltage transformer of josf. The submarine cable direct-current withstand voltage test charge accumulation measurement system also comprises a submarine cable insulation paper conductivity measurement device 3 which is connected with the submarine cable insulation paper sample and is used for measuring the conductivity gamma 1 of the submarine cable insulation paper; the submarine cable insulating oil conductivity measuring device 4 is used for measuring the conductivity gamma 2 of the submarine cable insulating oil, so that the operation processing device 5 can calculate accumulated charges of the submarine cable according to the conductivity of the submarine cable insulating paper and the conductivity of the submarine cable insulating oil, and accordingly can effectively guide the insulated and pressure-resistant discharging work of the submarine cable, prevent blind discharging, reduce the possibility of damage to testers and equipment, and have important significance for safe and stable operation of a power system.
Specifically, as shown in fig. 4, the above-mentioned submarine cable insulation paper conductivity measuring device 3 includes a dc power supply, an ammeter, a protected electrode 33, a protected electrode 34, an unprotected electrode 32, and an insulation paper sample 31; the insulating paper sample 31 is made of the same material as the insulating paper in the submarine cable, the insulating paper sample 31 and the insulating paper sample have the same conductivity, one surface of the insulating paper sample 31 is contacted with the unprotected electrode 32, the other surface of the insulating paper sample is contacted with the protected electrode 33 and the protected electrode 34, and the protected electrode 34 is arranged on two sides of the protected electrode 33 so as to prevent the protected electrode 33 from being damaged due to breakdown of the insulating paper sample 31 in the test process; the positive electrode of the direct current power supply is electrically connected with the unprotected electrode 32, the negative electrode is electrically connected with the protected electrode 33, the ammeter is connected and installed between the positive electrode of the direct current power supply and the protected electrode 33, and both the protected electrode 34 and the negative electrode of the direct current power supply are grounded, so that the current value in the test process of an insulation paper sample can be accurately measured by applying the device, the current I1 on the current I32 is recorded, and the conductivity gamma 1 of the insulation paper of the submarine cable can be calculated by the following formula:
γ1＝I1*h/(U1*A)
wherein: h is the thickness of the insulating paper sample; u1 is the voltage of the direct current power supply; a is the cross-sectional area of the insulating paper sample.
As shown in fig. 5, the above-mentioned submarine cable insulating oil conductivity measuring device 5 includes an outer electrode 51 having a cylindrical shape, an inner electrode 52 disposed in the outer electrode 51, an insulating oil filling channel 53 formed by a gap between the outer electrode 51 and the inner electrode 52, and an exhaust hole 54 disposed in the inner electrode 52 to prevent the insulating oil gas generated in the insulating oil filling channel 53 from forming pressure inside the insulating oil filling channel 53; a temperature measuring hole 54 for measuring the temperature of the insulating oil is formed in the inner electrode 52; an insulating plate 55 is installed to be connected between upper ends of the inner electrode 52 and the outer electrode 51 so as to electrically insulate the inner electrode 52 and the outer electrode 51; a shielding ring 56 is provided on the lower surface of the insulating plate 55 to make the electric field at the ends of the inner electrode 52 and the outer electrode 51 uniform; a shielding cap 57 is mounted on an upper surface of the insulating plate 55 to shield external electromagnetic interference; the external electrode 51 and the internal electrode 52 are respectively and electrically connected with the positive electrode and the negative electrode of the direct current power supply, and an ammeter is connected and installed between the negative electrode and the internal electrode of the direct current power supply, so that the current value in the insulating oil test process can be accurately measured by applying the device, the conductivity gamma 2 of the submarine cable insulating oil can be calculated by recording the current I2 on the ammeter through the following formula:
γ2＝I2/(U2*11.3*18)
wherein: u2 is the voltage of the direct current power supply; 11.3 is a form factor; 18 is a form factor.
Finally, the operation processing device can calculate the accumulated charge of the submarine cable according to the following formula:
Q＝J×A×D
wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time when the voltage generating device applies positive polarity voltage meeting the test requirement to the submarine cable; γ1 is the conductivity of the insulating paper; γ2 is the conductivity of the insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the seabedThe length of the cable.
Therefore, the submarine cable direct-current withstand voltage test charge accumulation measurement system can effectively check the high-voltage insulation performance of alternating-current 500kV submarine cables, overcome the problem that the insulation performance of the submarine cables cannot be effectively checked due to low test voltage in the traditional insulation resistance, and also can solve the calculation problem of charge accumulation after the test of the long-distance 500kV submarine cables, so that the submarine cable insulation withstand voltage discharging operation can be effectively guided, the system has important significance for safe and stable operation of an electric power system, has important technical support for power supply guarantee, and brings great economic benefit.
Example 2
The method for measuring the charge accumulation of the direct current withstand voltage test of the submarine cable specifically comprises the following steps:
s1, respectively measuring the insulation paper conductivity gamma 1 of the submarine cable and the insulation oil conductivity gamma 2 of the submarine cable by utilizing a submarine cable insulation paper conductivity measuring device and a submarine cable insulation oil conductivity measuring device; specifically, the submarine cable insulation paper conductivity measuring device and the submarine cable insulation oil conductivity measuring device described in example 1 were used.
S2, applying a positive voltage of 600kV to the submarine cable according to a set time by the 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 (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 the voltage regulation speed should not be lower than 2%/second when the voltage exceeds 75% of the test voltage (600 kV), so as to prevent the withstand voltage time of the submarine cable from being excessively long when the voltage approaches the test voltage. The specific test pressurization curve is shown in fig. 6, 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.
S3, calculating accumulated charge Q of the submarine cable according to the following formula
Q＝J×A×D
Wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time for the voltage generating device to apply positive voltage meeting the test requirement to the submarine cable, namely 60 minutes; γ1 is the conductivity of the insulating paper; γ2 is the conductivity of the insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the length of the submarine cable.
It can be seen that by calculating the accumulated charge Q of the submarine cable, a voltage of negative polarity, such as-900 kV, is input to the submarine cable, i.e., by changing the formula S3
The range of the medium time t is calculated until the error between the calculated value of the charge accumulation J in the step and the accumulated charge value J in the insulation and withstand voltage step S3 is less than 2%, so that the time for dissipating the charge after the insulation and withstand voltage of the submarine cable can be calculated, and a tester can purposely discharge (when the voltage value of the submarine cable is reduced to a safe value (such as 10 kV), the tester can ground the submarine cable) to avoid injury to the tester and damage to equipment.
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.
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 (9)
1. The charge accumulation measurement system for the direct-current withstand voltage test of the submarine cable is characterized by comprising
The voltage generating device comprises a direct-current voltage source, a transformer and a rectification booster, wherein the positive electrode and the negative electrode of the direct-current 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, and the output end of the rectification booster is electrically connected with a submarine cable so as to output positive voltage meeting test requirements to the submarine cable;
the voltage measuring device is electrically connected with the submarine cable and is used for measuring the voltage value change of the submarine cable;
the submarine cable insulation paper conductivity measuring device is connected with the submarine cable insulation paper sample and is used for measuring the conductivity of submarine cable insulation paper;
a submarine cable insulating oil conductivity measuring device for measuring the conductivity of submarine cable insulating oil;
an arithmetic processing device for calculating and processing accumulated charges of the submarine cable according to the conductivity of the submarine cable insulating paper and the conductivity of the submarine cable insulating oil;
the arithmetic processing device calculates and processes the accumulated charge Q of the submarine cable according to the following formula:
Q＝J×A×D
wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time when the voltage generating device applies positive polarity voltage meeting the test requirement to the submarine cable; γ1 is the conductivity of the submarine cable insulation paper; γ2 is the conductivity of the submarine cable insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the length of the submarine cable.
2. The submarine cable direct-current withstand voltage test charge accumulation measurement system according to claim 1, wherein the rectification booster is formed by connecting a plurality of rectification units in series, and the rectification units are composed of loops formed by two capacitors and two rectifiers.
3. The submarine cable direct-current withstand voltage test charge accumulation measurement system according to claim 1, wherein the voltage measurement device comprises a first resistor, a second resistor, a third resistor, and a voltage 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 is connected between the second resistor and the third resistor to measure the voltage value change of the submarine cable.
4. The submarine cable direct-current withstand voltage test charge accumulation measurement system according to claim 1, wherein the submarine cable insulation paper conductivity measurement device comprises a direct-current power supply, an ammeter, a protected electrode, an unprotected electrode and an insulation paper sample; one surface of the insulating paper sample is contacted with the unprotected electrode, the other surface of the insulating paper sample is contacted with the protected electrode and the protected electrode, and the protected electrodes are arranged on two sides of the protected electrode; the positive electrode of the direct current power supply is electrically connected with the unprotected electrode, the negative electrode is electrically connected with the protected electrode, and the ammeter is connected and installed between the positive electrode of the direct current power supply and the protected electrode; wherein, a protection electrode and a negative electrode of the direct current power supply are grounded.
5. The submarine cable direct-current withstand voltage test charge accumulation measurement system according to claim 1, wherein the submarine cable insulating oil conductivity measurement device comprises a cylindrical outer electrode, an inner electrode arranged in the outer electrode, an insulating oil filling channel formed by a gap between the outer electrode and the inner electrode, and an exhaust hole arranged in the inner electrode for preventing pressure of insulating oil gas generated in the insulating oil filling channel to the inside of the insulating oil filling channel; a temperature measuring hole is formed in the inner electrode for measuring the temperature of the insulating oil; an insulating plate is connected and installed between the upper ends of the inner electrode and the outer electrode so as to electrically insulate the inner electrode and the outer electrode; a shielding ring is arranged on the lower surface of the insulating plate so as to lead the electric field at the ends of the inner electrode and the outer electrode to be uniform; a shielding cap is installed on the upper surface of the insulating plate to shield external electromagnetic interference; the external electrode and the internal electrode are respectively and electrically connected with the positive electrode and the negative electrode of the direct current power supply, and an ammeter is connected and installed between the negative electrode and the internal electrode of the direct current power supply.
6. A method of measuring charge accumulation in a direct current withstand voltage test of a submarine cable, the method comprising the steps of:
measuring the insulation paper conductivity gamma 1 of the submarine cable and the insulation oil conductivity gamma 2 of the submarine cable respectively by using a submarine cable insulation paper conductivity measuring device and a submarine cable insulation oil conductivity measuring device;
the voltage generating device applies positive 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;
obtaining the accumulated charge Q of the submarine cable according to the following formula
Q＝J×A×D
Wherein: j is accumulated charge of a submarine cable unit cross section; v is positive voltage generated by the voltage generating device, e is the base number of natural logarithm; t is the time when the voltage generating device applies positive polarity voltage meeting the test requirement to the submarine cable; γ1 is the conductivity of the insulating paper; γ2 is the conductivity of the insulating oil; d1 is the thickness of submarine cable insulation paper; d2 is the thickness of the submarine cable insulating oil; the values of epsilon 0, epsilon 1 and epsilon 2 are 8.85X10 respectively -12 4.1,2.3; a is the cross-sectional area of the submarine cable; d is the length of the submarine cable.
7. The method for measuring the charge accumulation of the direct-current withstand voltage test of the submarine cable according to claim 6, wherein the voltage generating device is used for continuously pressurizing the submarine cable, the initial pressurizing stage is regulated slowly, the middle stage is regulated quickly and uniformly, and when the voltage value of the submarine cable exceeds 75% of the test requirement voltage value, the voltage regulating speed is not lower than 2%/second of the test requirement voltage value.
8. The method for measuring the charge accumulation of the direct-current withstand voltage test of the submarine cable according to claim 6, wherein the voltage generating device comprises a direct-current voltage source, a transformer and a rectifying booster, wherein the positive pole and the negative pole of the direct-current 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, and the output end of the rectifying booster is electrically connected with 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.
9. The method for measuring the charge accumulation of the direct-current withstand voltage test of the submarine cable according to claim 6, wherein the submarine cable insulation paper conductivity measuring device comprises a direct-current power supply, an ammeter, a protected electrode, an unprotected electrode and an insulation paper sample; one surface of the insulating paper sample is contacted with the unprotected electrode, the other surface of the insulating paper sample is contacted with the protected electrode and the protected electrode, and the protected electrodes are arranged on two sides of the protected electrode; the positive electrode of the direct current power supply is electrically connected with the unprotected electrode, the negative electrode is electrically connected with the protected electrode, and the ammeter is connected and installed between the positive electrode of the direct current power supply and the protected electrode; wherein, a protection electrode and a negative electrode of the direct current power supply are grounded; the submarine cable insulating oil conductivity measurement device comprises a cylindrical outer electrode, an inner electrode arranged in the outer electrode, and an insulating oil filling channel formed by a gap between the outer electrode and the inner electrode, wherein an exhaust hole is formed in the inner electrode so as to prevent pressure formed by insulating oil gas generated in the insulating oil filling channel to the inside of the insulating oil filling channel; a temperature measuring hole is formed in the inner electrode for measuring the temperature of the insulating oil; an insulating plate is connected and installed between the upper ends of the inner electrode and the outer electrode so as to electrically insulate the inner electrode and the outer electrode; a shielding ring is arranged on the lower surface of the insulating plate so as to lead the electric field at the ends of the inner electrode and the outer electrode to be uniform; a shielding cap is installed on the upper surface of the insulating plate to shield external electromagnetic interference; the external electrode and the internal electrode are respectively and electrically connected with the positive electrode and the negative electrode of the direct current power supply, and an ammeter is connected and installed between the negative electrode and the internal electrode of the direct current power supply.
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| CN103472369A (en) * | 2013-08-19 | 2013-12-25 | 广东电网公司电力科学研究院 | Prequalification test system and evaluating method for evaluating long-term electric property of direct-current extruded dielectric submarine cable system |
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