CN112964968B - System and method for testing long-distance submarine high-voltage cable voltage resistance of high-voltage bushing - Google Patents
System and method for testing long-distance submarine high-voltage cable voltage resistance of high-voltage bushing Download PDFInfo
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- CN112964968B CN112964968B CN202110154910.5A CN202110154910A CN112964968B CN 112964968 B CN112964968 B CN 112964968B CN 202110154910 A CN202110154910 A CN 202110154910A CN 112964968 B CN112964968 B CN 112964968B
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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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
Abstract
The invention discloses a system and a method for testing the voltage resistance of a long-distance submarine high-voltage cable by a high-voltage bushing, wherein the system comprises a test equipment unit, a land GIS equipment unit and an offshore GIS equipment unit; the land GIS equipment unit comprises a high-voltage bushing, a land GIS high-voltage reactor, a first land GIS isolation disconnecting link, a second land GIS isolation disconnecting link, a third land GIS isolation disconnecting link, a first land GIS grounding disconnecting link, a second land GIS grounding disconnecting link, a third land GIS grounding disconnecting link, a land GIS high-voltage reactor, a land GIS voltage transformer and a land GIS lightning arrester; the offshore GIS equipment unit comprises a first offshore GIS isolation disconnecting link, a second offshore GIS isolation disconnecting link, a third offshore GIS isolation disconnecting link, a fourth offshore GIS isolation disconnecting link, a first offshore GIS grounding disconnecting link, a second offshore GIS grounding disconnecting link, a third offshore GIS grounding disconnecting link, an offshore GIS high-voltage reactor, an offshore GIS voltage transformer and an offshore GIS lightning arrester.
Description
Technical Field
The invention belongs to the field of high-voltage tests of power equipment, and relates to a system and a method for testing the voltage resistance of a long-distance submarine high-voltage cable by using a high-voltage bushing.
Background
Offshore wind power in China is becoming a new power for global offshore wind power development, and the supporting effect of offshore wind power on energy transformation in China will be more and more obvious. Submarine cables are an indispensable part of ocean wind power construction, and the ocean wind power is developed from shallow sea to deep sea at present, which means that the submarine cables are longer and longer, and a pressure test is taken as a key part in a cable handover test, so that the research and the discussion of pressure test schemes and specific test methods of the long-distance cables are significant.
At present, the submarine high-voltage cable is mainly a crosslinked polyethylene insulation composite material cable, and an alternating current voltage withstand test is carried out according to the requirement in GB 50150-2016 electric equipment handover test standard in a voltage withstand mode. Because the high-voltage long-distance crosslinked polyethylene submarine cable has large capacity to ground, the requirement on withstand voltage test power supply equipment is high, the field test difficulty is high, and the alternating current withstand voltage test can be performed on the submarine cable by using a series-parallel resonance test method.
Along with the increase of the length of the submarine high-voltage cable, the line loss is increased, and the capacitance effect is more and more obvious, so that high-voltage compensation reactors are connected in parallel on two sides of the submarine high-voltage cable to reduce the capacitance effect, reduce power frequency overvoltage and improve the voltage distribution of the long-distance submarine high-voltage cable.
In the past, a special high-voltage test sleeve needs to be additionally arranged in a submarine cable connection test, SF6 gas in a submarine cable GIS interval gas chamber is recovered before a pressure-resistant test, the gas chamber is opened, a connecting guide rod of a submarine cable and a GIS bus is released, a submarine cable connector is connected with the special high-voltage test sleeve after the special high-voltage test sleeve is additionally arranged, the SF6 gas is injected again, the pressure-resistant test is carried out after the gas pressure is normal and the micro-water detection is qualified, and the special high-voltage test sleeve is detached and the submarine cable GIS interval gas chamber is recovered after the pressure-resistant test is finished. The special high-voltage test sleeve with the 110kV voltage level is generally a three-phase body, the special high-voltage test sleeve with the 220kV voltage level is a single phase, the installing process needs to be repeated for three times, each test needs to spend a large amount of time and manpower, and the submarine high-voltage cable needs to be restored by opening the air chamber after being subjected to voltage resistance, so that certain operation hidden danger exists, and the safety is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for testing the pressure resistance of a long-distance submarine high-voltage cable by using a high-voltage bushing, and the system and the method can shorten the test time, save labor and have higher safety.
In order to achieve the purpose, the test system for the long-distance submarine high-voltage cable voltage resistance of the high-voltage bushing comprises a submarine high-voltage cable, a test equipment unit, a land GIS equipment unit and a marine GIS equipment unit;
the land GIS equipment unit comprises a high-voltage bushing, a land GIS high-voltage reactor, a first land GIS isolation disconnecting link, a second land GIS isolation disconnecting link, a third land GIS isolation disconnecting link, a first land GIS grounding disconnecting link, a second land GIS grounding disconnecting link, a third land GIS grounding disconnecting link, a land GIS high-voltage reactor, a land GIS voltage transformer and a land GIS lightning arrester;
the offshore GIS equipment unit comprises a first offshore GIS isolation disconnecting link, a second offshore GIS isolation disconnecting link, a third offshore GIS isolation disconnecting link, a fourth offshore GIS isolation disconnecting link, a first offshore GIS grounding disconnecting link, a second offshore GIS grounding disconnecting link, a third offshore GIS grounding disconnecting link, an offshore GIS high-voltage reactor, an offshore GIS voltage transformer and an offshore GIS lightning arrester;
the test equipment unit is connected with one end of the land GIS high-voltage reactor, one end of the first land GIS isolation disconnecting link and one end of the first land GIS grounding disconnecting link through a high-voltage sleeve and is grounded; the other end of the first onshore GIS isolation switch is connected with one end of a third onshore GIS isolation switch, one end of a second onshore GIS isolation switch, one end of a third onshore GIS grounding switch, one end of a fourth onshore GIS isolation switch and one end of a submarine high-voltage cable;
the other end of the fourth onshore GIS isolation disconnecting link is grounded through an onshore GIS voltage transformer, the other end of the second onshore GIS isolation disconnecting link is grounded through a second onshore GIS grounding disconnecting link, the other end of the onshore GIS high-voltage reactor, the other end of the first onshore GIS grounding disconnecting link and the other end of the third onshore GIS grounding disconnecting link are grounded, and the other end of the third onshore GIS isolation disconnecting link is grounded through an onshore GIS lightning arrester;
the other end of the submarine high-voltage cable is connected with one end of a third offshore GIS isolation disconnecting link, one end of a fourth offshore GIS isolation disconnecting link, one end of a first offshore GIS isolation disconnecting link, one end of a second offshore GIS isolation disconnecting link and one end of a third offshore GIS grounding disconnecting link, the other end of the fourth offshore GIS isolation disconnecting link is grounded through an offshore GIS lightning arrester, the other end of the second offshore GIS isolation disconnecting link is grounded through a second offshore GIS grounding disconnecting link, the other end of the third offshore GIS isolation disconnecting link is grounded through an offshore GIS voltage transformer, the other end of the first offshore GIS isolation disconnecting link is divided into two paths, one path is grounded through the first offshore GIS grounding disconnecting link, and the other path is grounded through an offshore GIS high-voltage reactor.
The test equipment unit comprises a frequency converter, a test transformer, a resonance reactor and a voltage divider, wherein the frequency converter is connected with the high-voltage sleeve after passing through the test transformer, the resonance reactor and the voltage divider.
The land GIS further comprises a land GIS live display, wherein the land GIS live display is connected with the connecting node of the third land GIS isolation disconnecting link and the fourth land GIS isolation disconnecting link.
The marine GIS live display is connected with a connecting node of a fourth marine GIS isolation disconnecting link and a third marine GIS isolation disconnecting link.
A method for testing the pressure resistance of a long-distance submarine high-voltage cable by using a high-voltage bushing comprises the following steps:
1) Connecting and laying equipment;
2) Carrying out nuclear phase and insulation test on the submarine high-voltage cable, and recording the insulation resistance value of each phase of the submarine high-voltage cable;
3) Disconnecting the high-voltage side of the resonance reactor from the high-voltage bushing, and grounding the high-voltage side of the resonance reactor;
4) Closing the first onshore GIS isolation switch and disconnecting the second onshore GIS isolation switch, the third onshore GIS isolation switch and the fourth onshore GIS isolation switch; disconnecting the third onshore GIS grounding disconnecting link and short-circuiting the onshore GIS live display;
5) Closing the first offshore GIS grounding disconnecting link and the second offshore GIS grounding disconnecting link, and disconnecting the first offshore GIS isolation disconnecting link, the second offshore GIS isolation disconnecting link, the third offshore GIS isolation disconnecting link and the fourth offshore GIS isolation disconnecting link; disconnecting the third offshore GIS grounding disconnecting link and short-circuiting the offshore GIS live display;
6) Calculating the ground capacitance of the submarine high-voltage cable according to the cable parameters and the length of the submarine high-voltage cable, selecting a resonance reactor, connecting a frequency converter, a test transformer and the resonance reactor in a combined manner, wiring a high-voltage test to the phase A of a high-voltage bushing, and grounding the phase B of the high-voltage bushing and the phase C of the high-voltage bushing;
7) The method comprises the steps of boosting a frequency converter to an initial voltage, keeping the voltage unchanged, adjusting the frequency, searching for a resonant frequency, continuing boosting, stopping boosting when the resonant frequency is raised to 1.7U, keeping for 60min, slowly reducing the voltage when discharging does not occur, and disconnecting a power supply of the frequency converter after the voltage is reduced to zero;
8) Fully discharging the phase A of the submarine high-voltage cable, measuring the insulation resistance value of the phase A in the submarine high-voltage cable, comparing the insulation resistance value of the phase A in the submarine high-voltage cable obtained by current measurement with the insulation resistance value of the phase A in the submarine high-voltage cable obtained in the step 2), and when the difference value between the insulation resistance value of the phase A in the submarine high-voltage cable obtained by current measurement and the insulation resistance value of the phase A in the submarine high-voltage cable obtained in the step 2) is within a preset range, indicating that the phase A in the submarine high-voltage cable is qualified in voltage resistance; then, turning to step 9), otherwise, indicating that the A phase in the submarine high-voltage cable has a voltage-withstanding fault;
9) And (5) repeating the step 7) and the step 8) for the phase B in the submarine high-voltage cable and the phase C in the submarine high-voltage cable, so as to complete the pressure resistance test of the long-distance submarine high-voltage cable by the high-voltage sleeve 6.
The specific operation of the step 1) is as follows:
after the land GIS equipment unit and the offshore GIS equipment unit are installed, SF6 gas is injected to normal pressure, micro-water monitoring is qualified, and the submarine high-voltage cable is laid and connected.
The invention has the following beneficial effects:
according to the test system and the test method for the voltage resistance of the long-distance submarine high-voltage cable by the high-voltage sleeve, when the test system and the test method are specifically operated, the high-voltage sleeve connected with the onshore GIS and the resonance reactor is used for replacing a special test sleeve to perform the voltage resistance test on the high-voltage submarine cable, only part of the isolation disconnecting link and the grounding disconnecting link are needed to be operated, the voltage resistance test of the long-distance submarine high-voltage cable can be completed, the test preparation time can be greatly shortened, the operation hidden danger that the special high-voltage test sleeve is detached after the test is finished is avoided, the time is saved for the power receiving of an offshore wind power field, and meanwhile, the manpower is saved, and the safety is higher.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
The system comprises a power supply, a transformer, a grounding GIS high-voltage reactor, a grounding GIS live display, a grounding GIS lightning arrester, a grounding GIS voltage transformer, a marine GIS live display, a marine GIS lightning arrester, a grounding GIS voltage transformer, a marine GIS high-voltage reactor and a submarine high-voltage cable, wherein the power supply is 1, the testing transformer is 2, the resonant reactor is 3, the voltage divider is 4, the grounding GIS high-voltage reactor is 5, the high-voltage sleeve is 6, the grounding GIS live display is 7, the grounding GIS lightning arrester is 8, the grounding GIS voltage transformer is 9, the marine GIS live display is 10, the marine GIS live display is 11, the marine GIS voltage transformer is 12, the marine GIS high-voltage reactor is 13, and the submarine high-voltage cable is 14.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for testing the withstand voltage of the long-distance submarine high-voltage cable by using the high-voltage bushing according to the present invention includes a submarine high-voltage cable 14, a test equipment unit, a land GIS equipment unit, and a marine GIS equipment unit; the land GIS equipment unit comprises a high-voltage bushing 6, a land GIS high-voltage reactor 5, a first land GIS isolation disconnecting link G1, a second land GIS isolation disconnecting link G2, a third land GIS isolation disconnecting link G3, a first land GIS grounding disconnecting link G11, a second land GIS grounding disconnecting link G21, a third land GIS grounding disconnecting link G22, a land GIS high-voltage reactor 5, a land GIS voltage transformer 9 and a land GIS lightning arrester 8; the offshore GIS equipment unit comprises a first offshore GIS isolation disconnecting link G5, a second offshore GIS isolation disconnecting link G6, a third offshore GIS isolation disconnecting link G7, a fourth offshore GIS isolation disconnecting link G8, a first offshore GIS grounding disconnecting link G51, a second offshore GIS grounding disconnecting link G61, a third offshore GIS grounding disconnecting link G62, an offshore GIS high-voltage reactor 13, an offshore GIS voltage transformer 12 and an offshore GIS lightning arrester 11;
the test equipment unit is connected with one end of a land GIS high-voltage reactor 5, one end of a first land GIS isolation disconnecting link G1 and one end of a first land GIS grounding disconnecting link G11 through a high-voltage sleeve 6 and is grounded; the other end of the first onshore GIS isolation switch G1 is connected with one end of a third onshore GIS isolation switch G3, one end of a second onshore GIS isolation switch G2, one end of a third onshore GIS grounding switch G22, one end of a fourth onshore GIS isolation switch G4 and one end of a submarine high-voltage cable 17;
the other end of the fourth onshore GIS isolation disconnecting link G4 is grounded through an onshore GIS voltage transformer 9, the other end of the second onshore GIS isolation disconnecting link G2 is grounded through a second onshore GIS grounding disconnecting link G21, the other end of the onshore GIS high-voltage reactor 5, the other end of the first onshore GIS grounding disconnecting link G11 and the other end of the third onshore GIS grounding disconnecting link G22 are grounded, and the other end of the third onshore GIS isolation disconnecting link G3 is grounded through an onshore GIS lightning arrester 8;
the other end of the submarine high-voltage cable 14 is connected with one end of a third offshore GIS isolation disconnecting link G7, one end of a fourth offshore GIS isolation disconnecting link G8, one end of a first offshore GIS isolation disconnecting link G5, one end of a second offshore GIS isolation disconnecting link G6 and one end of a third offshore GIS grounding disconnecting link G62, the other end of the fourth offshore GIS isolation disconnecting link G8 is grounded through an offshore GIS lightning arrester 11, the other end of the second offshore GIS isolation disconnecting link G6 is grounded through a second offshore GIS grounding disconnecting link G61, the other end of the third offshore GIS isolation disconnecting link G7 is grounded through an offshore GIS voltage transformer 12, the other end of the first offshore GIS isolation disconnecting link G5 is divided into two paths, one path is grounded through a first offshore grounding disconnecting link G51, and the other path is grounded through an offshore GIS high-voltage reactor 13.
The test equipment unit comprises a frequency converter 1, a test transformer 2, a resonant reactor 3 and a voltage divider 4, wherein the frequency converter 1 is connected with a high-voltage bushing 6 after passing through the test transformer 2, the resonant reactor 3 and the voltage divider 4.
The invention also comprises a land GIS live display 7, wherein the land GIS live display 7 is connected with the connection node of the third land GIS isolation disconnecting link G3 and the fourth land GIS isolation disconnecting link G4.
The invention further comprises an offshore GIS live display 10, wherein the offshore GIS live display 10 is connected with a connecting node of a fourth offshore GIS isolation switch G8 and a third offshore GIS isolation switch G7.
Referring to fig. 2, the method for testing the withstand voltage of the long-distance submarine high-voltage cable by using the high-voltage bushing of the invention comprises the following steps:
1) After the onshore GIS equipment unit and the offshore GIS equipment unit are installed, SF6 gas is injected to normal pressure, micro-water monitoring is qualified, and the submarine high-voltage cable 14 is laid and connected;
2) Performing nuclear phase and insulation tests on the submarine high-voltage cable 14, and recording insulation resistance values of all phases of the submarine high-voltage cable 14;
3) Disconnecting the high-voltage side of the resonance reactor 3 from the high-voltage bushing 6 and grounding the high-voltage side of the resonance reactor 3;
4) Closing the first onshore GIS isolation switch G1 and disconnecting the second onshore GIS isolation switch G2, the third onshore GIS isolation switch G3 and the fourth onshore GIS isolation switch G4; disconnecting the third onshore GIS grounding disconnecting link G22 and short-circuiting the onshore GIS live display 7;
5) Closing the first offshore GIS grounding disconnecting link G51 and the second offshore GIS grounding disconnecting link G61, and disconnecting the first offshore GIS isolation disconnecting link G5, the second offshore GIS isolation disconnecting link G6, the third offshore GIS isolation disconnecting link G7 and the fourth offshore GIS isolation disconnecting link G8; disconnecting the third marine GIS grounding disconnecting link G62 and short-circuiting the marine GIS live display 10;
6) Calculating the ground capacitance of the submarine high-voltage cable 14 according to the cable parameters and the length of the submarine high-voltage cable 14, selecting a resonant reactor 3, connecting a frequency converter 1, a test transformer 2 and the resonant reactor 3 in a combined manner, connecting a high-voltage test to the phase A of a high-voltage bushing 6, and grounding the phase B of the high-voltage bushing 6 and the phase C of the high-voltage bushing 6;
7) After the frequency converter 1 is boosted to the initial voltage, the voltage is kept unchanged, the frequency is adjusted to search for the resonant frequency, then boosting is continuously carried out, when the voltage is raised to 1.7U, boosting is stopped, the voltage is kept for 60min, when discharging does not occur, voltage is slowly reduced, and after the voltage is reduced to zero, the power supply of the frequency converter 1 is disconnected;
8) Fully discharging the phase A of the submarine high-voltage cable 14, measuring the insulation resistance value of the phase A in the submarine high-voltage cable 14, comparing the insulation resistance value of the phase A in the submarine high-voltage cable 14 obtained by current measurement with the insulation resistance value of the phase A in the submarine high-voltage cable 14 obtained in the step 2), and when the difference value between the insulation resistance value of the phase A in the submarine high-voltage cable 14 obtained by current measurement and the insulation resistance value of the phase A in the submarine high-voltage cable 14 obtained in the step 2) is within a preset range, indicating that the voltage resistance of the phase A in the submarine high-voltage cable 14 is qualified; then, turning to step 9), otherwise, indicating that the A phase in the submarine high-voltage cable 14 has a voltage-withstanding fault;
9) And (4) repeating the step (7) and the step (8) for the phase B in the submarine high-voltage cable 14 and the phase C in the submarine high-voltage cable 14), and completing the test of the long-distance submarine high-voltage cable voltage resistance of the high-voltage sleeve 6.
When power generation occurs in the pressurizing process, insulation resistance needs to be tested on the discharging submarine high-voltage cable 14, whether the submarine high-voltage cable 14 is qualified or not is judged according to the insulation resistance value, and if the insulation resistance value is unqualified, all the steps need to be carried out again after defects are eliminated.
The difference between the invention and the prior art is that the high-voltage bushing 6 connected with the onshore GIS and the resonant reactor 3, the first onshore GIS isolation disconnecting link G1 and part of the bus need to withstand voltage together with the submarine high-voltage cable 14. According to the requirements in the DL/T555 gas insulated switchgear field withstand voltage and insulation test guideline, the test voltage values of the high-voltage bushing 6, the first land GIS isolation switch G1 and a part of the bus bar should be 80% of the factory test voltage, which is far higher than the withstand voltage test value of 1.7 times of the rated voltage of the submarine high-voltage cable 14, so that the high-voltage bushing 6 connected with the resonant reactor 3 by the land GIS completely has the test condition of replacing a proprietary high-voltage test bushing.
In conclusion, the high-voltage bushing 6 connected with the high-voltage reactor through the land GIS can be used for replacing a special test bushing, the test can be completed only by operating the isolation switch and the grounding switch of the land GIS, the special test bushing is not required to be additionally arranged, the test preparation time and cost are greatly reduced, the operation risk in dismantling the special test bushing can be avoided, and the operability is high.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. A test system for carrying out long-distance submarine high-voltage cable voltage resistance by a high-voltage bushing is characterized by comprising a submarine high-voltage cable (14), a test equipment unit, a land GIS equipment unit and a marine GIS equipment unit;
the land GIS equipment unit comprises a high-voltage bushing (6), a land GIS high-voltage reactor (5), a first land GIS isolation disconnecting link (G1), a second land GIS isolation disconnecting link (G2), a third land GIS isolation disconnecting link (G3), a first land GIS grounding disconnecting link (G11), a second land GIS grounding disconnecting link (G21), a third land GIS grounding disconnecting link (G22), a land GIS high-voltage reactor (5), a land GIS voltage transformer (9) and a land GIS lightning arrester (8);
the offshore GIS equipment unit comprises a first offshore GIS isolation disconnecting link (G5), a second offshore GIS isolation disconnecting link (G6), a third offshore GIS isolation disconnecting link (G7), a fourth offshore GIS isolation disconnecting link (G8), a first offshore GIS grounding disconnecting link (G51), a second offshore GIS grounding disconnecting link (G61), a third offshore GIS grounding disconnecting link (G62), an offshore GIS high-voltage reactor (13), an offshore GIS voltage transformer (12) and an offshore GIS lightning arrester (11);
the test equipment unit is connected with one end of a land GIS high-voltage reactor (5), one end of a first land GIS isolation disconnecting link (G1) and one end of a first land GIS grounding disconnecting link (G11) through a high-voltage bushing (6) and is grounded; the other end of the first land GIS isolation switch (G1) is connected with one end of a third land GIS isolation switch (G3), one end of a second land GIS isolation switch (G2), one end of a third land GIS grounding switch (G22), one end of a fourth land GIS isolation switch (G4) and one end of a submarine high-voltage cable (14);
the other end of a fourth land GIS isolation disconnecting link (G4) is grounded through a land GIS voltage transformer (9), the other end of a second land GIS isolation disconnecting link (G2) is grounded through a second land GIS grounding disconnecting link (G21), the other end of a land GIS high-voltage reactor (5), the other end of a first land GIS grounding disconnecting link (G11) and the other end of a third land GIS grounding disconnecting link (G22) are grounded, and the other end of a third land GIS isolation disconnecting link (G3) is grounded through a land GIS lightning arrester (8);
the other end of the submarine high-voltage cable (14) is connected with one end of a third offshore GIS isolation disconnecting link (G7), one end of a fourth offshore GIS isolation disconnecting link (G8), one end of a first offshore GIS isolation disconnecting link (G5), one end of a second offshore GIS isolation disconnecting link (G6) and one end of a third offshore GIS grounding disconnecting link (G62), the other end of the fourth offshore GIS isolation disconnecting link (G8) is grounded through an offshore GIS lightning arrester (11), the other end of the second offshore GIS isolation disconnecting link (G6) is grounded through a second offshore GIS grounding disconnecting link (G61), the other end of the third offshore GIS isolation disconnecting link (G7) is grounded through an offshore GIS voltage transformer (12), the other end of the first offshore GIS isolation disconnecting link (G5) is divided into two paths, one path of the two paths is grounded through a first offshore grounding disconnecting link (G51), and the other path is grounded through an offshore GIS voltage transformer (13).
2. The system for testing the withstand voltage of the high-voltage bushing for the long-distance submarine high-voltage cable according to claim 1, wherein the test equipment unit comprises a frequency converter (1), a test transformer (2), a resonance reactor (3) and a voltage divider (4), wherein the frequency converter (1) is connected with the high-voltage bushing (6) through the test transformer (2), the resonance reactor (3) and the voltage divider (4).
3. The system for testing the withstand voltage of the high-voltage bushing for the long-distance submarine high-voltage cable according to claim 2, further comprising a land GIS live display (7), wherein the land GIS live display (7) is connected to a connection node of a third land GIS isolation switch (G3) and a fourth land GIS isolation switch (G4).
4. The system for testing the voltage resistance of the high-voltage bushing for the long-distance submarine high-voltage cable according to claim 3, further comprising an offshore GIS live display (10), wherein the offshore GIS live display (10) is connected with a connection node of a fourth offshore GIS isolation switch (G8) and a third offshore GIS isolation switch (G7).
5. A method for testing the withstand voltage of a long-distance submarine high-voltage cable by using a high-voltage bushing, which is characterized in that the system for testing the withstand voltage of the long-distance submarine high-voltage cable by using the high-voltage bushing as claimed in claim 4 comprises the following steps:
1) Connecting and laying equipment;
2) Carrying out nuclear phase and insulation test on the submarine high-voltage cable (14), and recording the insulation resistance value of each phase of the submarine high-voltage cable (14);
3) Disconnecting the high-voltage side of the resonance reactor (3) from the high-voltage bushing (6), and grounding the high-voltage side of the resonance reactor (3);
4) Closing the first land GIS isolation switch (G1), and disconnecting the second land GIS isolation switch (G2), the third land GIS isolation switch (G3) and the fourth land GIS isolation switch (G4); disconnecting the third land GIS grounding disconnecting link (G22) and short-circuiting the land GIS live display (7);
5) Closing a first offshore GIS grounding disconnecting link (G51) and a second offshore GIS grounding disconnecting link (G61), and disconnecting a first offshore GIS isolation disconnecting link (G5), a second offshore GIS isolation disconnecting link (G6), a third offshore GIS isolation disconnecting link (G7) and a fourth offshore GIS isolation disconnecting link (G8); disconnecting the third marine GIS grounding disconnecting link (G62) and short-circuiting the marine GIS live display (10);
6) Calculating the ground capacitance of the submarine high-voltage cable (14) according to the cable parameters and the length of the submarine high-voltage cable (14), selecting a resonance reactor (3), connecting a frequency converter (1), a test transformer (2) and the resonance reactor (3) in a combined manner, connecting a high-voltage test to the phase A of a high-voltage bushing (6), and grounding the phase B of the high-voltage bushing (6) and the phase C of the high-voltage bushing (6);
7) The method comprises the steps of boosting the frequency converter (1) to an initial voltage, keeping the voltage unchanged, adjusting the frequency, searching for the resonant frequency, continuing boosting, stopping boosting when the resonant frequency is raised to 1.7U, keeping for 60min, slowly reducing the voltage when the resonant frequency is not discharged, and disconnecting the power supply of the frequency converter (1) after the voltage is reduced to zero;
8) Fully discharging the phase A of the submarine high-voltage cable (14), measuring the insulation resistance value of the phase A in the submarine high-voltage cable (14), comparing the insulation resistance value of the phase A in the submarine high-voltage cable (14) obtained by current measurement with the insulation resistance value of the phase A in the submarine high-voltage cable (14) obtained in the step 2), and when the difference value between the insulation resistance value of the phase A in the submarine high-voltage cable (14) obtained by current measurement and the insulation resistance value of the phase A in the submarine high-voltage cable (14) obtained in the step 2) is within a preset range, indicating that the phase A in the submarine high-voltage cable (14) is qualified in voltage withstanding; then, turning to step 9), otherwise, indicating that the A phase in the submarine high-voltage cable (14) has a voltage-resistant fault;
9) And (4) repeating the step (7) and the step (8) for the phase B in the submarine high-voltage cable (14) and the phase C in the submarine high-voltage cable (14), and completing the pressure resistance test of the long-distance submarine high-voltage cable by the high-voltage sleeve (6).
6. The method for testing the withstand voltage of the high-voltage bushing for the long-distance submarine high-voltage cable according to claim 5, wherein the specific operation of step 1) is as follows:
after the onshore GIS equipment unit and the offshore GIS equipment unit are installed, SF6 gas is injected to normal pressure, micro-water monitoring is qualified, and the submarine high-voltage cable (14) is laid and connected.
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