CN117691497A - GIL and small GIS system for in-line and out-line of nuclear power plant and high-voltage test method - Google Patents
GIL and small GIS system for in-line and out-line of nuclear power plant and high-voltage test method Download PDFInfo
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- 238000010998 test method Methods 0.000 title abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 135
- 238000009413 insulation Methods 0.000 claims abstract description 35
- 238000002955 isolation Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 33
- 229910052802 copper Inorganic materials 0.000 claims description 32
- 239000010949 copper Substances 0.000 claims description 32
- 239000004020 conductor Substances 0.000 claims description 18
- 239000012212 insulator Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000012797 qualification Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 31
- 230000007547 defect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000023402 cell communication Effects 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The invention provides a GIL and small GIS system of an in-out line of a nuclear power plant, which comprises the following components: the small incoming line GIS is positioned at the main transformer side of the GIL and consists of three phases, and each phase of small incoming line GIS comprises a first isolation disconnecting link, a first grounding disconnecting link, a first quick grounding disconnecting link, a lightning arrester, a small test air chamber, a GIL vertical section and a grounding system which are connected through a first bus; the outgoing line small GIS consists of three phases, and each outgoing line small GIS comprises a second isolation disconnecting link, a second grounding disconnecting link, a second quick grounding disconnecting link and a voltage transformer which are connected through a second bus. The invention also provides a high-voltage test method of the nuclear power plant. According to the invention, GIL insulation resistance measurement, loop resistance measurement, voltage withstand test, partial discharge test and the like are relatively easy to carry out, so that the comprehensive evaluation of the GIL state of the operating nuclear power plant is facilitated in time, in addition, the workload can be effectively reduced, the risk of foreign matters is reduced, the operation reliability of the unit is improved, and the environmental protection benefit is improved.
Description
Technical Field
The invention relates to the technical field of high-voltage tests of nuclear power plants, in particular to a GIL and small GIS system of a line in and out of the nuclear power plant and a high-voltage test method.
Background
The main transformer outgoing line of the nuclear power plant is generally connected to a switchgear station GIS (Gas Insulated Switchgear, gas-insulated switchgear) by using a GIL (Gas Insulated Transmission Line, gas-insulated transmission line) to realize electric energy transmission. GIL is a totally enclosed busbar, typically deployed in an underground piping lane, and using SF 6 The sulfur hexafluoride gas is used as an internal insulating medium, and has the characteristics of compactness, less maintenance workload and the like. At present, a GIL connection mode is adopted between a main transformer of a most domestic reactor-type nuclear power plant including VVER, M310, hualong No. I and the like and a switching station GIS, namely a main transformer high-voltage side outgoing line is connected with the GIL through a small GIS, the GIL is connected to the switching station GIS through an isolation disconnecting link after passing through a pipe gallery of hundreds of meters under the ground, a lightning arrester is connected to the main transformer side of the GIL, a voltage transformer is connected to the switching station side of the GIS, and a main transformer side small GIS and a GIL shell are generally accessed to a main ground network nearby. The prior art has the following problems:
first, arrester and voltageThe mutual inductor is directly connected with the GIL, so that the mutual inductor cannot be directly isolated when the related high-voltage test is carried out on the mutual inductor. The transition conductors of the lightning arrester and the voltage transformer are required to be removed to realize isolation, and meanwhile SF of the air chamber where the transition conductors are positioned and the adjacent air chambers are required to be separated 6 The gas is treated. The operation opening parts are more, the risk of introducing foreign matters is high, the consumption period is long, and the requirement of the overhaul period of the nuclear power unit is generally not met.
Second, in the GIL withstand voltage test, the bushing is typically installed over the vertical section of the main transformer side of the GIL. The air chamber is usually large and the SF to be treated during operation 6 The gas is more, and the foreign matter falls into the vertical section from the vertical section top easily, leads to unable direct clearance, needs demolish this section conductor and carries out thoroughly clearance this moment.
Third, testing GIL loop resistance requires applying a current of not less than 100A. Limited by GIL length, loop resistance measurement needs to be performed using a large-capacity test instrument and a long-distance large-sectional area copper wire, and measurement data is not accurate enough. Therefore, loop resistance measurement is not performed after the nuclear power plant GIL is put into operation, so that contact defects of the main loop cannot be found in time.
Fourth, because the large-capacity main transformer of the nuclear power plant usually adopts a split-phase main transformer, the distance between phases of the main transformer side inlet small GIS and GIL is far, and the shell adopts a nearby direct grounding mode. The grounding mode can lead the large current induced by the shell to enter the main transformer area ground network when the unit operates, so that the ground potential distribution is influenced, and the adverse effects on adjacent equipment, such as protection misoperation, are further caused; in addition, the corrosion of the ground network can be accelerated, so that the grounding effect is poor, and the risk of personnel electric shock easily occurs during unit operation or high-voltage test.
Fifth, GIL three-post insulator is a weak insulation part, but the failure to determine its position when performing partial discharge test results in inaccurate detection. Meanwhile, the three-post insulator is also a damaged part in transportation, and damage occurs when the ground post of the three-post insulator is misdirected during transportation.
In recent years, GIL defects of a nuclear power plant frequently occur, and the GIL defects are limited to the structure and the method, so that the preventive test is difficult, and therefore, the GIL is usually maintained in a state, namely, the GIL is maintained and tested after being in a problem, and the influence on a nuclear power unit is large.
Disclosure of Invention
The invention aims to provide a small GIS system for nuclear power plant GIL and inlet and outlet lines and a high-voltage test method, which solve the problems that the prior GIL high-voltage test of the nuclear power plant needs more disassembly and assembly parts, long maintenance period, long influence on power generation time and SF 6 The problems of high gas waste, equipment damage and high environmental pollution risk.
In order to achieve the above object, the present invention provides the following technical solutions:
a nuclear power plant GIL and in-out small GIS system, comprising:
the small incoming line GIS is positioned at the main transformer side of the GIL and consists of three phases, and each phase of small incoming line GIS comprises a first isolation disconnecting link, a first grounding disconnecting link, a first quick grounding disconnecting link, a lightning arrester, a small test air chamber, a GIL vertical section and a grounding system which are connected through a first bus;
the outgoing line small GIS consists of three phases, and each outgoing line small GIS comprises a second isolation disconnecting link, a second grounding disconnecting link, a second quick grounding disconnecting link and a voltage transformer which are connected through a second bus.
Further, the small test air chamber is located above the GIL vertical segment and is connected to the GIL vertical segment through an unvented basin.
Further, the lower contact of the unvented basin is provided with a tee joint after passing through the transition conductor, the lower part of the tee joint is connected with the conductor of the vertical section of the GIL, the upper part of the unvented basin is provided with a contact for installing the transition conductor, and the contact is provided with a voltage equalizing cap.
Further, a first overhaul hole and a second overhaul hole are formed in the upper side and the side face of the shell of the small test air chamber.
Further, the housing is provided with a gas communication tube which is communicated with the gas chamber of the vertical section of the GIL after passing through a gas isolation valve on the vertical section of the GIL.
Further, the second quick grounding disconnecting link is located on the GIL side of the second isolation disconnecting link, and the second grounding disconnecting link and the voltage transformer are located on the GIS side of the switching station of the second isolation disconnecting link.
In addition, the invention also provides a high-voltage test method of the nuclear power plant, which comprises the following steps:
step 1: GIL insulation resistance test;
step 2: GIL loop resistance test;
step 3: GIL withstand voltage and partial discharge test.
The step 1 specifically comprises the following steps:
step 1.1: confirming that the GIL has been isolated from power failure;
step 1.2: switching on 110JE-A and 113JE-A, and switching off 110JS-A and 113 JS-A;
step 1.3: switching on 105JE-A and switching off 114 JE-A;
step 1.4: disconnecting the 105JE-A grounding lug and the secondary aviation plug, and measuring the A-phase insulation resistance of the GIL from the 105 JE-A;
step 1.5: repeating the steps to respectively measure the insulation resistance of the GIL of the B phase and the C phase;
step 1.6: and after the test is finished, the equipment is restored to the initial state.
The step 2 specifically comprises the following steps:
step 2.1: confirming that the GIL has been isolated from power failure;
step 2.2: switching on the 110JE and 113JE three phases and switching off the 110JS and 113JS three phases;
step 2.3: switching on 105JE three phases and 114JE three phases;
step 2.4: respectively removing 105JE and 114JE three-phase grounding connection pieces and a secondary aviation plug;
step 2.5: by not less than 50mm 2 The copper cables at the positions 114JE-A and 114JE-B close to the grounding copper bar at the main loop side of the GIL;
step 2.6: connecting test wires of a loop resistance test instrument to the grounded copper bars short-circuited by the copper cables at 114JE-A and 114JE-B, applying 100A current, and measuring the resistance value R of the short-circuited copper cable and the contact surface thereof Short AB ；
Step 2.7: connecting test wires of a loop resistance test instrument to copper bars of 105JE-A and 105JE-B close to the GIL main loop at the small inlet wire GIS side, applying100A current, and the overall loop resistance R of the two phases of the GIL main loop A, B and the copper cable and the contact surface thereof AB ；
Step 2.8: the above steps are repeated to respectively measure the short circuit copper cable resistance R of the GIL main loop B, C two phases and A, C two phases Short BC And R is Short CA And an overall loop resistance R BC And R is CA The method comprises the steps of carrying out a first treatment on the surface of the The following calculation formula is obtained:
R AB ＝R A +R B +R short AB
R BC ＝R B +R C +R Short BC
R CA ＝R C +R A +R Short CA
Step 2.9: the main loop resistance R of A, B, C three phases is obtained through calculation A 、R B 、R C The formula is as follows:
comparing the measured resistance value with a design management value, and judging whether the main loop resistance is abnormal or not;
step 2.10: and after the main loop resistance measurement is finished, the equipment is restored to the initial state.
The step 3 specifically comprises the following steps:
step 3.1: confirming that the GIL has been isolated from power failure;
step 3.2: closing the isolation valve of the small test air chamber to enable the air chamber SF adjacent to the small test air chamber to be closed 6 Reduced to half pressure and tested for SF in a small chamber 6 Recycling the gas;
step 3.3: opening a manhole of the small test air chamber and removing the shielding cover;
step 3.4: connecting the test sleeve with the small test air chamber, and making a clean manhole blocking plate for sealing the small test air chamber;
step 3.5: vacuumizing through the inflation port of the small test air chamber, and filling qualified SF (sulfur hexafluoride) into the air chamber and the adjacent air chambers after the vacuumizing is qualified 6 The gas is at rated pressure, the isolating valve is opened slowly, and after standing for 24 hours, the gas of each independent air chamber is measured to confirm qualification;
step 3.6: confirming that the small GIS side of the incoming line is required to be grounded, parts, test equipment and a grounding system are grounded;
step 3.7: breaking 110JS-A, 113JS-A, 105JE-A and 114 JE-A;
step 3.8: closing 110JE-A and 113 JE-A;
step 3.9: the insulation resistance of the A phase GIL is measured to be qualified through a test sleeve terminal;
step 3.10: connecting a high-voltage output line of the pressure-resistant test instrument to a test sleeve terminal;
step 3.11: applying voltage to the test sleeve and the A-phase GIL, measuring partial discharge, and measuring a probe on a three-post insulator mark of the GIL shell when the partial discharge is measured by adopting an ultrasonic principle;
step 3.12: removing related test wiring after the withstand voltage and the partial discharge are qualified, and measuring insulation resistance according to the step 3.9;
step 3.13: carrying out gas treatment;
step 3.14: dismantling the test sleeve and recovering the shielding cover and the manhole plugging plate of the small test air chamber;
step 3.15: SF of recovery test small air chamber and adjacent air chamber 6 Gas, and standing and detecting;
step 3.16: repeating the steps to respectively carry out the withstand voltage test and the partial discharge test of the phase B and the phase C;
step 3.17: and after the GIL withstand voltage and partial discharge test is finished, the equipment is restored to the initial state.
Compared with the prior art, the nuclear power plant GIL and small GIS system for in-line and out-line and the high-voltage test method have the following beneficial effects:
according to the invention, GIL insulation resistance measurement, loop resistance measurement, voltage withstand test, partial discharge test and the like are easier to carry out, so that the comprehensive evaluation of the GIL state of the operating nuclear power plant is facilitated in time, in addition, the workload can be effectively reduced, the risk of foreign matters is reduced, the operation reliability of the unit is improved, and the environmental protection benefit is improved.
The invention realizes GIL alternating current withstand voltage and partial discharge test without detaching transition conductors of the lightning arrester and the voltage transformer.
The invention realizes that SF is not destroyed 6 The gas chamber can conveniently measure the insulation resistance of the GIL main loop.
The invention realizes that SF is not destroyed 6 The gas chamber can conveniently measure the resistance of the GIL loop.
The invention reduces a large amount of SF 6 The gas waste, the GIL pressure resistance and partial discharge test by adopting the method only need to deal with a small amount of SF 6 The gas can be used, and a large amount of greenhouse gas emission is avoided.
The invention effectively reduces the workload of GIL alternating current withstand voltage and partial discharge test, and saves a great amount of overhaul period.
The invention realizes the positioning of the three-post insulator, improves the accuracy of discharge signal detection in partial discharge test and the accuracy in GIL transportation, and improves the operation reliability of the three-post insulator.
The invention effectively reduces the risk of magnetic saturation of the electromagnetic voltage transformer at the small GIS side of outgoing line caused by adopting the variable frequency power supply in GIL alternating current withstand voltage and partial discharge test. The invention also realizes that the tail end of the primary winding of the small GIS side voltage transformer is not required to be dismantled for grounding when relevant insulation test projects of the main transformer high-voltage winding are carried out.
The invention realizes the work of GIL insulation resistance and loop resistance measurement during annual overhaul of the unit, and improves the accuracy of measurement data.
According to the invention, the grounding reliability of the small GIS side shell of the incoming line is increased, the current of the small GIS side shell of the incoming line to the ground during operation is reduced, and the risk of potential lifting of the main ground network is reduced.
The present invention reduces the risk of foreign matter entering the interior of the GIL.
The invention can realize the completion of the GIL related high-voltage test during the overhaul main transformer outage period of the nuclear power unit, discover the potential safety hazard existing in the GIL in advance, and avoid the non-outage event caused by the problem of the GIL during the unit operation.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are used in the technical description will be briefly described below.
FIG. 1 is a schematic diagram of a small GIS structure of an incoming line provided by the invention;
FIG. 2 is an enlarged view at A of FIG. 1;
FIG. 3 is a schematic diagram of a small GIS structure with outgoing lines provided by the invention;
FIG. 4 is a schematic diagram of GIL and a small GIS with in-out line provided by the present invention;
FIG. 5 is a schematic diagram of GIL loop resistance measurement provided by the present invention;
FIG. 6 is a schematic view of the installation position of the sleeve for GIL withstand voltage test and partial discharge test provided by the invention.
Reference numerals illustrate:
1-a first busbar; 2-a first isolation knife switch; 3-a first grounding disconnecting link; 4-a first quick grounding disconnecting link; 5-lightning arresters; 6-testing a small air chamber; 7-GIL vertical segments; 8-a grounding system; 9-a main transformer; 10-high voltage side outgoing line; 11-a transition conductor; 12-tee joint; 13-conductors; 14-a grounding material; 15-a second bus, 16-a second isolation disconnecting link, 17-a second grounding disconnecting link, 18-a second quick grounding disconnecting link and 19-a voltage transformer;
101-transformer side bus bars; 102-GIL side bus bar;
601-unvented basin; 602-lower contacts; 603-contacts; 604-a pressure equalizing cap; 605-a housing; 606-a first manhole; 607-a second manhole; 608-a gas communication tube; 609-a gas isolation valve;
1401-a lightning arrester ground wire; 1402-GIL ground line;
1501-GIL side bus bar; 1502-GIS side bus.
Detailed Description
Further details are provided below with reference to the specific embodiments.
The GIL in-out line system of the nuclear power plant comprises a small GIS (i.e. an incoming small GIS) connected with the high-voltage outgoing line of the main transformer, and a small GIS (outgoing small GIS) connected with the GIS of the switching station. The GIL shell is provided with position marks for the sliding three-post insulator and the fixed three-post insulator, and the position and the orientation marks of the grounding block on the grounding post are marked by obvious mark classification.
The invention provides a GIL and small GIS system for in-line and out-line of a nuclear power plant, which comprises a small GIS for in-line and a small GIS for out-line.
(1) Inlet wire small GIS
As shown in fig. 1 and 2, the incoming small GIS consists of three phases, namely a phase, B phase and C phase. Taking phase A as an example, the main transformer high-voltage side small GIS comprises a first bus 1, a first isolation disconnecting link 2, a first grounding disconnecting link 3, a first quick grounding disconnecting link 4, a lightning arrester 5, a small test air chamber 6, a GIL vertical section 7 and a grounding system 8.
The first isolating disconnecting link 2, the first grounding disconnecting link 3, the first quick grounding disconnecting link 4, the lightning arrester 5, the small test air chamber 6 and the GIL vertical section 7 are connected through the first bus 1, and the first bus 1 is connected with the high-voltage side outgoing line 10 of the main transformer 9 and the GIL main loop.
The small test air chamber 6 is located above the GIL vertical section 7 and is connected to the GIL vertical section 7 through a non-aerated basin 601. The lower contact 602 of the non-ventilation basin 601 is provided with a tee joint 12 after passing through the transition conductor 11, and the lower part of the tee joint 12 is connected with the conductor 13 of the GIL vertical section 7. Above the unvented basin 601 of the test chamber 6, a contact 603 is provided for mounting the transition conductor 11, the contact 603 being provided with a pressure equalizing cap 604.
A first manhole 606 and a second manhole 607 are arranged above and on the side surface of the shell 605 of the small test air chamber 6, and are plugged by a plugging plate. Housing 605 is provided with SF 6 Gas communication tube 608, gas communication tube 608 is in gas cell communication with GIL vertical section 7 via gas isolation valve 609 on GIL vertical section 7. The small test air chamber 6 is provided with an air charging port.
The quick grounding disconnecting link 4 is positioned on the first bus 1, one side is connected with the main loop of the GIL vertical section 7 and the test small air chamber 6 through a tee joint 12, and the other side is connected with the isolating disconnecting link 2.
The first isolating switch 2 is positioned on the first bus 1, one side of the first isolating switch is connected with the first quick grounding switch 4, and the other side of the first isolating switch is connected with the grounding switch 3. The other side of the grounding disconnecting link 3 is connected with a high-voltage side outgoing line 10 of the main transformer through a bus 101. The lightning arrester 5 is connected to the bus bar 101. The relative positions of the first earthing knife-switch 3 and the lightning arrester 5 are not required.
The first grounding disconnecting link 3 is isolated from the shell by insulation, and can withstand 10kV alternating current withstand voltage for 1min, and a grounding connecting piece is arranged between the conductor and the shell. The first quick grounding disconnecting link 4 is isolated from the shell by insulation, and can withstand 10kV alternating current withstand voltage for 1min, and a grounding connecting piece is arranged between the conductor and the shell. The bus 1 shell is insulated from the main transformer 9 box.
The three-phase incoming small GIS housing is connected to the ground system 8 via the ground material 14. The grounding system 8 is buried underground and consists of an annular copper cable. The ground material 14 and the ground system 8 are provided with an insulating layer. The grounding system 8 is connected to the main grounding net at different positions by adopting bare copper cables at two different positions, and the grounding material 14 and the grounding system 8 are connected by adopting a welding mode and are subjected to insulation and corrosion prevention treatment.
(2) Small GIS of being qualified for next round of competitions
As shown in FIG. 3, the small GIS is located at the switchyard side of the GIL and is composed of three phases, namely A phase, B phase and C phase. Taking phase a as an example, the small outlet GIS comprises a second busbar 15, a second isolation switch 16, a second grounding switch 17, a second quick grounding switch 18 and a voltage transformer 19. One side of the isolation disconnecting link 16 is connected with the GIL through a bus 1501, the other side is connected with the quick ground disconnecting link 18 and the isolation disconnecting link 16, the other side of the isolation disconnecting link 16 is connected with the ground disconnecting link 17 and the bus 1502, and the other side of the bus 1502 is connected with the switchyard GIS. The voltage transformer 19 is connected to the bus bar 1502.
The second quick ground knife 18 is located on the GIL side of the second isolation knife 16. The second earthing knife-switch 17 and the voltage transformer 19 are located on the switchyard GIS side of the second isolation knife-switch 16. The relative positions of the second earthing knife-switch 17 and the voltage transformer 19 are not required.
The second earthing knife-switch 17 and the second quick earthing knife-switch 18 are isolated from the shell by insulation, and can withstand 10kV alternating current withstand voltage for 1min.
(3) GIL high-voltage test method
The invention also provides a high-voltage test method of the nuclear power plant, which comprises the following steps:
step 1: GIL insulation resistance test.
Step 2: GIL loop resistance test.
Step 3: GIL withstand voltage and partial discharge test.
As shown in fig. 4, the main transformer of the nuclear power plant is provided with three 500kV single-phase transformers to form a three-phase transformer, and the main transformer is connected to a switching station GIS by using GIL. Taking phase A as an example for illustration, up>A main loop of up>A phase A GI of the main transformer 9 side is sequentially provided with up>A lightning arrester 110PW-A, up>A grounding disconnecting link 110JE-A, an isolating disconnecting link 110JS-A and up>A quick grounding disconnecting link 105JE-A from up>A transformer high-voltage outlet 10. The main loop of the switch station side GI enters the switch station factory building and sequentially passes through the quick grounding switch 114JE-A, the isolation switch 113JS-A, the grounding switch 113JE-A and the voltage transformer 101TU-A to be connected into the switch station GIS system. Phase B and phase C are the same as phase A.
As shown in fig. 4, the GIL insulation resistance test method is as follows:
step 1.1: confirming that the GIL has been isolated from power failure;
step 1.2: closing the grounding disconnecting link 110JE-A and the grounding disconnecting link 113JE-A, and opening the isolating disconnecting link 110JS-A and the isolating disconnecting link 113 JS-A;
step 1.3: switching on the quick grounding switch 105JE-A, and switching off the quick grounding switch 114 JE-A;
step 1.4: disconnecting the quick grounding disconnecting link 105JE-A grounding connecting piece and the secondary aviation plug, and measuring the A-phase insulation resistance of the GIL from the quick grounding disconnecting link 105 JE-A; GIL insulation resistance may also be measured from fast ground knife switch 114JE-A with reference to step three and step four;
step 1.5: repeating the steps to respectively measure the insulation resistance of the GIL of the B phase and the C phase;
step 1.6: and after the test is finished, the equipment is restored to the initial state.
As shown in fig. 5, the GIL loop resistance test method is as follows:
step 2.1: confirming that the GIL has been isolated from power failure;
step 2.2: switching on the grounding disconnecting link 110JE and the grounding disconnecting link 113JE in three phases, and switching off the isolation disconnecting link 110JS and the isolation disconnecting link 113JS in three phases;
step 2.3: switching on the fast grounding disconnecting link 105JE three phases, and switching on the fast grounding disconnecting link 114JE three phases;
step 2.4: respectively removing the three-phase grounding connection pieces of the quick grounding disconnecting link 105JE and the quick grounding disconnecting link 114JE and the secondary aviation plug;
step 2.5: by not less than 50mm 2 The copper cable short circuit quick grounding knife switch 114JE-A and the quick grounding knife switch 114JE-B are close to the grounding copper bar of the GIL main loop side;
step 2.6: connecting a loop resistance test instrument test wire to a quick grounding disconnecting link 114JE-A and a grounding copper bar short-circuited by a copper cable at the quick grounding disconnecting link 114JE-B, applying 100A current, and measuring the resistance value R of the short-circuited copper cable and the contact surface thereof Short AB ；
Step 2.7: connecting a loop resistance test instrument test wire to a quick grounding switch 105JE-A and a copper bar of the quick grounding switch 105JE-B close to the GIL main loop at the small inlet wire GIS side, applying 100A current to measure the overall loop resistance R of the two phases of the GIL main loop A, B and the copper cable and the contact surface thereof AB ；
Step 2.8: the short-circuit copper cable resistances R of the two phases B, C and A, C of the GIL main loop are respectively measured by referring to the steps Short BC And R is Short CA And an overall loop resistance R BC And R is CA The method comprises the steps of carrying out a first treatment on the surface of the The following calculation formula is obtained:
R AB ＝R A +R B +R short AB
R BC ＝R B +R C +R Short BC
R CA ＝R C +R A +R Short CA
Step 2.9: the main loop resistance R of A, B, C three phases is obtained through calculation A 、R B 、R C The formula is as follows. And comparing the measured resistance value with the design management value to judge whether the main loop resistance is abnormal.
Step 2.10: and after the main loop resistance measurement is finished, the equipment is restored to the initial state.
As shown in fig. 6, GIL withstand voltage and partial discharge test are as follows:
step 3.1: confirming that the GIL has been isolated from power failure;
step 3.2: closing the pilot cell 6 isolation valve 609 will place the cell SF adjacent to the pilot cell 6 6 Reduced to half pressure and tested for SF for small chamber 6 6 Recycling the gas;
step 3.3: opening the access holes 606 and 607 of the small test air chamber 6, and removing the shielding cover 604;
step 3.4: connecting the test sleeve with the small test air chamber 6, and closing the overhaul holes 606 and 607 of the small test air chamber 6 after cleaning;
step 3.5: vacuumizing through an inflation inlet of the small test air chamber 6, and filling qualified SF (sulfur hexafluoride) into the air chamber and the adjacent air chambers after the vacuumizing is qualified 6 The gas is allowed to reach rated pressure, the isolation valve 609 is slowly opened, and after standing for 24 hours, the gas of each independent air chamber is measured to confirm that the gas is qualified;
step 3.6: the equipment, the components, the test equipment and the grounding system 8 which are needed to be grounded on the small GIS side of the incoming line are well grounded;
step 3.7: separating the isolating switch 110JS-A, the isolating switch 113JS-A, the quick grounding switch 105JE-A and the quick grounding switch 114 JE-A;
step 3.8: switching on the grounding switch 110JE-A and the grounding switch 113 JE-A;
step 3.9: the insulation resistance of the A phase GIL is measured to be qualified through a test sleeve terminal;
step 3.10: connecting a high-voltage output line of the prepared pressure-resistant test instrument to a test sleeve terminal;
step 3.11: applying voltage to the test sleeve and the A-phase GIL according to the related standard, and measuring partial discharge; when the ultrasonic principle is adopted to measure partial discharge, the probe is measured on the three-post insulator mark of the GIL shell, and the ground block side of the three-post insulator is measured in an important way;
step 3.12: removing related test wiring after the withstand voltage and the partial discharge are qualified, and measuring insulation resistance according to the step nine;
step 3.13: repeating the step 2 for gas treatment;
step 3.14: removing the test sleeve and recovering the shielding cover 604 and the access holes 606 and 607 plugging plates of the small test air chamber 6;
step 3.15: recovery test of SF of small air cell 6 and adjacent air cells 6 Gas, standing for 24 hours, and detecting to be qualified;
step 3.16: repeating the steps to respectively carry out the withstand voltage test and the partial discharge test of the phase B and the phase C;
step 3.17: and after the GIL withstand voltage and partial discharge test is finished, the equipment is restored to the initial state.
In a word, the GIL high voltage test method provided by the invention mainly comprises insulation resistance measurement, loop resistance measurement, alternating current withstand voltage test and partial discharge test.
The insulation resistance measurement can be performed by a quick grounding disconnecting link close to the small GIS side of the incoming line. And switching off the two isolating switches, and switching on the fast grounding disconnecting link at the small GIS side of the incoming line and the fast grounding disconnecting link at the small GIS side of the outgoing line. And (3) disconnecting the grounding connection piece and the secondary control plug of the quick grounding disconnecting link at the small GIS side of the incoming line, and selecting a proper megameter to measure the insulation resistance at the quick grounding disconnecting link.
When GIL loop resistance measurement is carried out, two grounding disconnecting switches are switched on, two isolating disconnecting switches are switched off, and two quick grounding disconnecting switches are switched on; respectively disassembling the grounding connection pieces of the two quick grounding knife switches and the aviation plug; a short copper cable is used for shorting A, B two-phase copper bars of a switch station side quick grounding disconnecting link close to the GIL main loop; connecting a test wire of a loop resistance test instrument to a short-circuit point of the A, B two-phase short-circuit copper cable, and measuring the resistance values of the short-circuit copper cable and the contact surface thereof; connecting a loop resistance test instrument test wire to a A, B two-phase copper bar of a transformer side quick grounding disconnecting link close to a GIL main loop at a small GIS (gas insulated switchgear) at a wire inlet side, and measuring the overall loop resistance of the GIL main loop A, B two phases, a copper cable and a contact surface thereof; repeating the method to respectively measure the overall loop resistances of the two phases B, C and A, C of the GIL main loop; respectively obtaining A, B, C three-phase main loop resistances through calculation; and comparing the measured resistance value with the design management value to judge whether the main loop resistance is abnormal.
When a withstand voltage test and a partial discharge test are carried out, removing a pressure equalizing cap in the small test air chamber, and installing a high-voltage test sleeve through a transition conductor; switching on two grounding disconnecting switches of the small incoming line GIS and the small outgoing line GIS, switching off two isolating disconnecting switches and switching off two quick grounding disconnecting switches; when the insulation resistance is measured, the insulation resistance can be measured through a grounding disconnecting link, and a megameter can be connected to the outgoing line position of the high-voltage test sleeve to measure the insulation resistance; in the voltage withstand test and the partial discharge test, after a high-voltage output line of a test instrument is connected to a high-voltage test sleeve terminal, voltage is applied according to relevant standards, and partial discharge measurement is carried out; performing partial discharge signal detection by adopting an ultrasonic method, and selecting detection positions of three post insulators according to the marks on the GIL; judging whether the GIL has insulation defects according to the test result.
And judging whether the GIL main loop and the insulation thereof have defects according to the test result.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A nuclear power plant GIL and in-out small GIS system, comprising:
the small incoming line GIS is positioned at the high-voltage side of the main transformer and consists of three phases, and each phase of small incoming line GIS comprises a first isolation disconnecting link (2), a first grounding disconnecting link (3), a first quick grounding disconnecting link (4), a lightning arrester (5), a small test air chamber (6), a GIL vertical section (7) and a grounding system (8) which are connected through a first bus (1);
the outgoing line small GIS consists of three phases, and each phase of outgoing line small GIS comprises a second isolation disconnecting link (16), a second grounding disconnecting link (17), a second quick grounding disconnecting link (18) and a voltage transformer (19) which are connected through a second bus (15).
2. The nuclear power plant GIL and in-out small GIS system according to claim 1, wherein the test small plenum (6) is located above the GIL vertical section (7) and is connected to the GIL vertical section (7) by means of a non-ventilated basin (601).
3. The nuclear power plant GIL and inlet and outlet small GIS system according to claim 2, wherein a tee joint (12) is arranged behind a transition conductor (11) of a lower contact (602) of the unvented basin (601), the lower part of the tee joint (12) is connected with a conductor (13) of the GIL vertical section (7), a contact (603) for installing the transition conductor (11) is arranged above the unvented basin (601), and a pressure equalizing cap (604) is arranged on the contact (603).
4. The nuclear power plant GIL and in-out small GIS system according to claim 1, wherein a first manhole (606) and a second manhole (607) are provided above and sideways of the housing (605) of the test small air chamber (6).
5. The nuclear power plant GIL and in-out small GIS system according to claim 4, wherein the housing (605) is provided with a gas communication tube (608), and the gas communication tube (608) is communicated with the gas chamber of the GIL vertical section (7) through a gas isolation valve (609) on the GIL vertical section (7).
6. The nuclear power plant GIL and in-out small GIS system according to claim 1, wherein the second fast ground knife (18) is located at the GIL side of the second isolation knife (16), the second ground knife (17) and the voltage transformer (19) are located at the switchyard GIS side of the second isolation knife (16).
7. A method for high voltage testing of a nuclear power plant, comprising:
step 1: GIL insulation resistance test;
step 2: GIL loop resistance test;
step 3: GIL withstand voltage and partial discharge test.
8. The GIL and in-out small GIS system of nuclear power plant of claim 7, wherein step 1 specifically comprises:
step 1.1: confirming that the GIL has been isolated from power failure;
step 1.2: switching on 110JE-A and 113JE-A, and switching off 110JS-A and 113 JS-A;
step 1.3: switching on 105JE-A and switching off 114 JE-A;
step 1.4: disconnecting the 105JE-A grounding lug and the secondary aviation plug, and measuring the A-phase insulation resistance of the GIL from the 105 JE-A;
step 1.5: repeating the steps to respectively measure the insulation resistance of the GIL of the B phase and the C phase;
step 1.6: and after the test is finished, the equipment is restored to the initial state.
9. The GIL and in-out small GIS system of nuclear power plant of claim 7, wherein step 2 specifically comprises:
step 2.1: confirming that the GIL has been isolated from power failure;
step 2.2: switching on the 110JE and 113JE three phases and switching off the 110JS and 113JS three phases;
step 2.3: switching on 105JE three phases and 114JE three phases;
step 2.4: respectively removing 105JE and 114JE three-phase grounding connection pieces and a secondary aviation plug;
step 2.5: by not less than 50mm 2 The copper cables at the positions 114JE-A and 114JE-B close to the grounding copper bar at the main loop side of the GIL;
step 2.6: connecting test wires of a loop resistance test instrument to the grounded copper bars short-circuited by the copper cables at 114JE-A and 114JE-B, applying 100A current, and measuring the resistance value R of the short-circuited copper cable and the contact surface thereof Short AB ；
Step 2.7: connecting test wires of a loop resistance test instrument to copper bars of 105JE-A and 105JE-B close to the GIL main loop at the small inlet wire GIS side, applying 100A current, and measuring the overall loop resistance R of the two phases of the GIL main loop A, B and the copper cable and the contact surface thereof AB ；
Step 2.8: the above steps are repeated to respectively measure the short circuit copper cable resistance R of the GIL main loop B, C two phases and A, C two phases Short BC And R is Short CA And an overall loop resistance R BC And R is CA The method comprises the steps of carrying out a first treatment on the surface of the The following calculation formula is obtained:
R AB ＝R A +R B +R short AB
R BC ＝R B +R C +R Short BC
R CA ＝R C +R A +R Short CA
Step 2.9: the main loop resistance R of A, B, C three phases is obtained through calculation A 、R B 、R C The formula is as follows:
comparing the measured resistance value with a design management value, and judging whether the main loop resistance is abnormal or not;
step 2.10: and after the main loop resistance measurement is finished, the equipment is restored to the initial state.
10. The GIL and in-out small GIS system of nuclear power plant of claim 7, wherein step 3 specifically comprises:
step 3.1: confirming that the GIL has been isolated from power failure;
step 3.2: closing the isolation valve of the small test air chamber to enable the air chamber SF adjacent to the small test air chamber to be closed 6 Reduced to half pressure and tested for SF in a small chamber 6 Recycling the gas;
step 3.3: opening a manhole of the small test air chamber and removing the shielding cover;
step 3.4: connecting the test sleeve with the small test air chamber, and making a clean manhole blocking plate for sealing the small test air chamber;
step 3.5: vacuumizing through the inflation port of the small test air chamber, and filling qualified SF (sulfur hexafluoride) into the air chamber and the adjacent air chambers after the vacuumizing is qualified 6 The gas is at rated pressure, the isolating valve is opened slowly, and after standing for 24 hours, the gas of each independent air chamber is measured to confirm qualification;
step 3.6: confirming that the small GIS side of the incoming line is required to be grounded, parts, test equipment and a grounding system are grounded;
step 3.7: breaking 110JS-A, 113JS-A, 105JE-A and 114 JE-A;
step 3.8: closing 110JE-A and 113 JE-A;
step 3.9: the insulation resistance of the A phase GIL is measured to be qualified through a test sleeve terminal;
step 3.10: connecting a high-voltage output line of the pressure-resistant test instrument to a test sleeve terminal;
step 3.11: applying voltage to the test sleeve and the A-phase GIL, measuring partial discharge, and measuring a probe on a three-post insulator mark of the GIL shell when the partial discharge is measured by adopting an ultrasonic principle;
step 3.12: removing related test wiring after the withstand voltage and the partial discharge are qualified, and measuring insulation resistance according to the step 3.9;
step 3.13: carrying out gas treatment;
step 3.14: dismantling the test sleeve and recovering the shielding cover and the manhole plugging plate of the small test air chamber;
step 3.15: SF of recovery test small air chamber and adjacent air chamber 6 Gas, and standing and detecting;
step 3.16: repeating the steps to respectively carry out the withstand voltage test and the partial discharge test of the phase B and the phase C;
step 3.17: and after the GIL withstand voltage and partial discharge test is finished, the equipment is restored to the initial state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311587442.6A CN117691497A (en) | 2023-11-27 | 2023-11-27 | GIL and small GIS system for in-line and out-line of nuclear power plant and high-voltage test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311587442.6A CN117691497A (en) | 2023-11-27 | 2023-11-27 | GIL and small GIS system for in-line and out-line of nuclear power plant and high-voltage test method |
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| CN117691497A true CN117691497A (en) | 2024-03-12 |
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| CN202311587442.6A Pending CN117691497A (en) | 2023-11-27 | 2023-11-27 | GIL and small GIS system for in-line and out-line of nuclear power plant and high-voltage test method |
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