CN112526299A - Mobile +/-800 kV direct-current withstand voltage test platform and using method thereof - Google Patents
Mobile +/-800 kV direct-current withstand voltage test platform and using method thereof Download PDFInfo
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- CN112526299A CN112526299A CN202011317412.XA CN202011317412A CN112526299A CN 112526299 A CN112526299 A CN 112526299A CN 202011317412 A CN202011317412 A CN 202011317412A CN 112526299 A CN112526299 A CN 112526299A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D63/00—Motor vehicles or trailers not otherwise provided for
- B62D63/06—Trailers
- B62D63/08—Component parts or accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
- B66F7/18—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by a single central jack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/22—Lifting frames, e.g. for lifting vehicles; Platform lifts with tiltable platforms
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Abstract
The invention provides a mobile +/-800 kV direct current withstand voltage test platform and a using method thereof, wherein the test platform comprises a withstand voltage test part, a supporting structure part, a lifting arrangement part and a field transfer part; the voltage withstand test part comprises a direct-current high-voltage generator, a double-layer hard equalizing ring and an operation part; the supporting structure part comprises a test platform chassis, a standing foot arranged at the bottom of the test platform chassis, a lifting lug arranged on the platform chassis and a cushion block; the arrangement lifting part adopts a hydraulic power-assisted mechanism to realize the automatic lifting and collecting functions of the test platform and complete the conversion of the platform between a test state and a transportation state; the transportation and transfer part comprises wheels arranged below the chassis of the test platform, a steering platform connected with the wheels and a traction pull rod connected with the steering platform. The invention can be pulled by a tractor to flexibly turn in the converter station, and can carry out on-site withstand voltage test on the DC equipment with the maximum +/-800 kV in a converter valve hall under the condition of no hoisting.
Description
Technical Field
The invention relates to the field of withstand voltage tests of direct current equipment, in particular to a mobile +/-800 kV direct current withstand voltage test platform and a using method thereof.
Background
A large number of +/-800 kV, +/-500 kV conventional direct current and +/-420 kV ultra/extra-high voltage flexible direct current converter stations and the like are built in China, and a large number of ultra/extra-high voltage converter station engineering is still planned and built currently. According to the standard' Q/GDW 1168-. Therefore, the requirements for the ultra/extra-high voltage direct current field test are higher for a longer period of time.
At present, a direct current device field voltage withstand test of +/-800 kV is usually performed by using a bulk direct current high voltage generator (direct current high voltage generator for short) for pressurization, and the direct current voltage divider is used for voltage measurement in bulk. The bulk equipment is usually composed of 2-3 sections of straight high voltage generators and voltage dividers, and is additionally provided with two large-diameter hard equalizing rings, current-limiting resistors and other accessory equipment. The equipment needs a large amount of hoisting, assembling and carrying work on a test site, and in a converter station with a gradually-compact design, the defects of large occupied area, long construction time and difficult risk management and control are obviously revealed. In particular, in the equipment in the converter valve hall, since the crane using fuel oil as energy is prohibited from entering the valve hall, the direct current equipment voltage withstand equipment in the valve hall is difficult to complete, and a direct current transformer voltage withstand test is not performed according to the standard due to condition limitation during annual inspection of the converter station.
Compared with a bulk test platform, the self-contained test platform has the advantages of high field unfolding speed, high automation degree, small occupied area and high safety coefficient. At present, for alternating current transformation equipment such as ultra/ultra high voltage transformers and GIS (gas insulated switchgear), a self-contained test platform or a test vehicle which can be used for transformer stations and converter station sites (including valve hall interiors) exists, and the application effect in field tests is good. However, no self-contained test platform for ultra/extra-high voltage direct current equipment exists at present.
The patent document with the bulletin number of CN204008982U (bulletin date 2014, 12, 10) discloses a positive and negative high-power direct-high voltage generator of cordwood system, and the utility model discloses a direct current high-voltage generator group of many sections of cordwood systems is spliced to form the withstand voltage test platform of direct current equipment that can use at the current conversion station scene, but does not possess the automatic function of arranging, needs to hoist and mount at the scene and arrange.
The patent with the publication number of CN103600680B (publication date is 2015, 11 and 11) provides an automatic test vehicle formed by combining a building block type withstand voltage test device and an automatic displacement device, and the test vehicle is an AC withstand voltage test vehicle for 750kV or below, and is provided with a 750kV ultrahigh voltage device AC withstand voltage test platform. However, in the arrangement process of the building block type test equipment platform, a plurality of displacement devices such as a motor, hydraulic pressure, air pressure and the like are needed, a plurality of power sources are needed, and the design complexity of the equipment far exceeds that of equipment with a single hydraulic power source; the building block type test platform disclosed by the patent can be actually arranged or collected on site for 40 minutes, is shorter than the traditional bulk equipment, but is not suitable for the ultrahigh voltage converter station with numerous direct current equipment and needing frequent arrangement and collection.
Different from the building block type automatic arrangement test platform, a pressure-resistant test platform of a turning lifting type extra-high voltage alternating current device only needing a hydraulic mechanism is provided by a patent with a publication number of CN209231458U (publication date of 2019, 8 and 9) and a patent with a publication number of CN208980252U (publication date of 2019, 6 and 14), namely an extra-high voltage GIS (gas insulated switchgear) self-loading and unloading electric power test moving platform. The platform further improves the test efficiency on the premise that the pressure-resistant test is completed by automatic arrangement without hoisting. However, such platforms have the characteristic of longer length than the building blocks, and the steering mechanism used in the above patent is difficult to meet the requirement that the longer platform is steered to 90 degrees in a road with the width less than 4m in a transformer substation and a converter station, especially when entering a converter valve hall. In practice, there are even situations where the crane is required to assist in turning in a station.
In addition, at present, no integral, movable and hoisting-free voltage withstand test platform for +/-800 kV direct current equipment exists, and particularly equipment in a converter valve hall is available.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides equipment which is based on the hydraulic mechanism turnover type lifting, is provided with a full-angle steering platform, can flexibly turn in a converter station under the traction of a tractor, can carry out on-site pressure-resistant test on the DC equipment with the maximum voltage of +/-800 kV in a converter valve hall under the condition of no lifting, can effectively improve the on-site test efficiency of the DC equipment, reduce the personnel cooperation, solve the problem that the equipment test in the valve hall is difficult to complete because a fuel test vehicle or the tractor is forbidden to enter the valve hall in the prior art, and provide a better selection scheme for the handover test of newly built DC engineering in China and the routine test and diagnostic test of the built DC engineering in a period of time in the future.
A mobile +/-800 kV direct current withstand voltage test platform comprises a withstand voltage test part, a supporting structure part, a lifting arrangement part and a field transfer part;
the voltage withstand test part comprises a direct-current high-voltage generator, a double-layer hard equalizing ring and an operation part, wherein the double-layer hard equalizing ring and the direct-current high-voltage generator are integrally arranged, and the operation part is used for controlling the direct-current high-voltage generator to generate 0-800kV negative direct-current voltage which is used as a power supply for a test of direct-current transmission equipment with the maximum voltage of +/-800 kV;
the supporting structure part comprises a test platform chassis, a standing foot arranged at the bottom of the test platform chassis 8 and a lifting lug arranged on the platform chassis, wherein the standing foot is used for stabilizing the test platform chassis during field test and road transportation, and the lifting lug is used for lifting the platform down or up to a flat car for transportation when the platform enters or leaves the station;
the arrangement lifting part adopts a hydraulic power-assisted mechanism to realize the automatic lifting and collecting functions of the test platform and complete the conversion of the platform between a test state and a transportation state;
the transportation transfer part comprises wheels arranged below a chassis of the test platform, a steering platform connected with the wheels and a traction pull rod connected with the steering platform, the steering platform can freely turn for 180 degrees, and the traction pull rod is used for being connected with a traction vehicle.
Furthermore, the withstand voltage test part also comprises a current-limiting resistor, and the current-limiting resistor is detachably mounted at the center of the double-layer hard grading ring.
Furthermore, the arrangement lifting part comprises a hydraulic station, a lifting hydraulic cylinder, a bracket, a base, a hoop hydraulic cylinder and a hydraulic controller for operating the lifting hydraulic cylinder;
the hydraulic station is used for providing power for the lifting hydraulic cylinders and the hoop hydraulic cylinders, and the pair of lifting hydraulic cylinders are positioned on two sides of the bracket and used for lifting the bracket and the reactor to be vertical for testing and falling back after the test;
the bracket is positioned at the lower part of the direct-current high-voltage generator and is directly connected with the lifting hydraulic cylinder, and the bracket is used for dispersing the stress of the direct-current high-voltage generator in the lifting and falling processes;
the base is used for supporting the direct-current high-voltage generator, and a limiting buckle is arranged on the base and used for fixing the direct-current high-voltage generator in a test state;
a position and angle sensor is arranged on the chassis of the test platform and used for detecting whether the direct-current high-voltage generator is lifted to be vertical or not and whether the direct-current high-voltage generator falls back to a lying position or not, and judging a result to be used by logic locking of the hydraulic cylinder;
the hoop and the hoop hydraulic cylinder are positioned at the top end of the bracket and used for fastening the direct-current high-voltage generator and the bracket together in the lifting and falling processes, and the opening and closing power of the hoop is provided by the hoop hydraulic cylinder.
Further, there is following protection logic shutting between staple bolt pneumatic cylinder, the hydraulic cylinder that lifts and the spacing buckle:
(1) for the hoop hydraulic cylinder:
when the lifting hydraulic cylinder acts or the direct-current high-pressure generator is in a lying state, the hoop-holding hydraulic cylinder cannot act;
when the direct-current high-voltage generator is lifted to be vertical, and the base and the chassis of the test platform are fastened through the limiting buckle, the hoop can separate the bracket from the direct-current high-voltage generator;
when the direct-current high-voltage generator is separated from the bracket, the hoop needs to be kept in a separated state, and the hoop hydraulic cylinder cannot act;
(2) for the lifting hydraulic cylinder:
when the direct-current high-voltage generator is separated from the bracket, no action limitation exists;
when the direct-current high-voltage generator is combined with the bracket, the hoop needs to be folded to tightly hold the direct-current high-voltage generator, and the holding lifting hydraulic cylinder can act;
when the direct current high voltage generator is lifted to be vertical, if the bracket and the direct current high voltage generator need to be separated, the lifting hydraulic cylinder can act only when the base is fastened with the chassis of the test platform and the anchor ear is in a separated state.
Furthermore, the standing foot uses a manual rocker or a hydraulic boosting type to operate the lifting of the chassis of the test platform.
Furthermore, the diameter of the double-layer hard grading ring is 300mm, and the requirement of no discharge under 800kV negative direct current voltage is met.
Further, the direct current high voltage generator comprises a middle transformer positioned at the bottom and a single-section voltage multiplying cylinder positioned above the middle transformer.
The use method of the mobile +/-800 kV direct-current withstand voltage test platform is characterized by comprising the following steps: the method comprises two stages of test arrangement of a test platform in a converter station and test acceptance and completeness of the test platform in the converter station; wherein
The use process of the test platform in the test arrangement stage in the converter station is as follows:
1.1) positioning and fixing of test platform
The test platform is pulled to the vicinity of the equipment to be tested by a forklift or a trailer in the convertor station, and the safety distance between the test platform and the equipment to be tested and other nearby equipment needs to be ensured; driving the traction vehicle away from the test area, tightly contacting the ground by using an operation station foot and leveling the test platform;
1.2) lifting of DC high-voltage generator
Connecting a test platform power supply, starting a hydraulic station, operating a hydraulic controller to extend a lifting hydraulic cylinder, lifting the bracket together with the direct-current high-voltage generator to be vertical, closing a limiting buckle to fix a base of the direct-current high-voltage generator and a platform chassis, operating the hydraulic controller to separate a hoop through the hoop hydraulic cylinder, then contracting the lifting hydraulic cylinder through the hydraulic controller, returning the bracket to a lying position, and finally closing the hydraulic station;
1.3) test connection
Completing test loop wiring including a test platform according to relevant standards of an extra-high voltage withstand voltage test;
the use process of the test platform in the test acceptance stage of the converter station is as follows:
2.1) removing the connection
Removing all test connection wires;
2.2) falling back of the DC high-voltage generator
Starting the hydraulic station, operating the hydraulic controller to extend the lifting hydraulic cylinder, lifting the bracket to be vertical, and then operating the hydraulic controller to close the hoop through the hoop hydraulic cylinder; separating the limiting buckle to release the fixation between the base of the direct-current high-voltage generator and the platform chassis, contracting the lifting hydraulic cylinder through the hydraulic controller, dropping the bracket together with the direct-current high-voltage generator to the lying position, and finally closing the hydraulic station;
2.3) test platform transfer
The operating station foot leaves the ground, and the test platform is pulled out of the test area by using a traction vehicle.
Further, before the step 1.2), if the load short-circuit current is large, a current-limiting resistor is installed at the center of the double-layer hard grading ring.
The invention can carry out on-site withstand voltage test on the DC equipment with the maximum voltage of +/-800 kV, the platform can be transported horizontally and can be automatically transported on the site of the converter station, and the invention is provided with the hydraulic mechanism which can be automatically unfolded and folded, can realize the on-site DC withstand voltage test without hoisting, effectively reduces the test labor cost, improves the working efficiency of personnel and improves the flexibility and maneuverability of the test work.
Drawings
FIG. 1 is a front view of a mobile + -800kV DC withstand voltage test platform of the present invention in a transportation state;
FIG. 2 is a top view of the mobile + -800kV DC withstand voltage test platform of the present invention in a transportation state;
FIG. 3 is a front view of the mobile + -800kV DC withstand voltage test platform of the present invention in a test state;
FIG. 4 is a left side view of the mobile + -800kV DC withstand voltage test platform of the present invention in a test state;
fig. 5 is a schematic structural view of a manipulation part in the present invention.
In the figure: the device comprises a direct current high-voltage generator 1, a double-layer hard equalizing ring 2, a current-limiting resistor 3, an operation part 4, an intermediate transformer 5, a pressure doubling cylinder 6, an equipment box 7, a platform chassis 8, a platform chassis 9, a standing foot 10, a lifting lug 11, a cushion block 12, a lifting hydraulic cylinder 13, a bracket 14, a base 14, a hoop 15, a hoop hydraulic cylinder 16, a wheel 17, a steering platform 18 and a traction pull rod 19.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, one embodiment of the mobile ± 800kV dc withstand voltage test platform of the present invention includes a withstand voltage test part, a supporting structure part, a layout lifting part and a field operation part.
1) Pressure test section
The withstand voltage test part comprises a direct current high voltage generator 1(800kV), a double-layer hard voltage-equalizing ring 2, a current-limiting resistor 3 and an operation part 4, and is a main part for implementing a direct current withstand voltage test.
The direct current high voltage generator 1 comprises a middle transformer 5 at the bottom and a single-stage voltage doubling drum 6 above. Through the control of the control part 4, the intermediate transformer 5 can output a linearly variable voltage, and finally a negative polarity direct current voltage of 0-800kV is generated at the direct current high voltage generator 1, so that the direct current high voltage generator can be used as a power supply for testing a direct current transmission device with the maximum voltage of +/-800 kV. The dc test voltage is obtained by measuring the output voltage of the rectifying voltage-dividing circuit, and needs to be corrected when the device is shipped. The performance index of the dc high voltage generator 1 is shown in table 1:
TABLE 1 DC HIGH-VOLTAGE GENERATOR PERFORMANCE PARAMETERS
The double-layer hard equalizing ring 2 and the direct-current high-voltage generator 1 are designed integrally, and overall lifting arrangement is facilitated. The diameter of each grading ring 2 is 300mm, and the requirement of no discharge under 800kV negative direct current voltage is met.
The current limiting resistor 3 is positioned at the center of the double-layer hard equalizing ring 2 and is designed to be detachable. The function is to limit the short-circuit current to protect the direct-current high-voltage generator 1 when the short-circuit breakdown fault occurs to the test sample. The device needs to be installed in the device test with high voltage level and large short-circuit capacity, and can be disassembled on the contrary.
The control part 4 is positioned in an equipment box 7 at the front end of the test platform, the specific structure of the control part 4 is shown in fig. 5, and the control part 4 comprises a hydraulic control part, a straight high-rise test control part and a test power supply part. The hydraulic control part comprises a hydraulic station 4-1 for various hydraulic mechanisms and a hydraulic power distribution control box 4-2 connected with the control part; the direct-high voltage transmission test control part comprises a direct-high voltage transmission control box 4-3 and has the functions of manual or automatic voltage boosting, charging current limiting, test data recording, information display, fault protection and the like; the test power supply part comprises a power distribution control panel 4-4 and a cable drum 4-5 for connecting and supplying a test power supply.
2) Supporting structure part
The supporting structure part comprises a test platform chassis 8 and a standing foot 9 arranged at the bottom of the test platform chassis 8. The chassis 8 is a main framework of the test platform and is used for mounting other three parts of equipment; the standing foot 9 is used for stabilizing the test platform chassis 8 during field test and road transportation, and the manual rocker is used for operating the lifting of the test platform chassis. The platform chassis 8 is provided with 4 lifting lugs 10 for lifting the platform down or up to a flat car for transportation when entering or leaving the station. There are 6 cushion blocks 11 on the platform chassis 8, wherein 4 cushion blocks 11 in the middle part are bracket cushion blocks for supporting bracket 13 in the state of lying down, and 2 cushion blocks 11 at the tail part are DC high voltage generator cushion blocks for supporting DC high voltage generator 1 in the vertical state.
3) Arranging lifting parts
The arrangement lifting part adopts a hydraulic power-assisted mechanism to realize the functions of automatic lifting, folding and the like of the test platform, the conversion of the platform between a test state and a transportation state is completed, and the consumed time can be controlled within 4 minutes. The part mainly comprises a hydraulic station, a lifting hydraulic cylinder 12, a bracket 13, a base 14, an anchor ear 15, an anchor ear hydraulic cylinder 16 and a hydraulic controller for operating the lifting hydraulic cylinder 12.
The hydraulic station is positioned in an equipment box 7 at the head of the test platform and used for providing power for lifting the hydraulic cylinder 12 and the hoop hydraulic cylinder 16;
the pair of lifting hydraulic cylinders 12 are positioned at two sides of the bracket 13 and used for lifting the bracket 13 and the reactor to be vertical for testing and falling back after the testing;
the bracket 13 is positioned at the lower part of the direct-current high-voltage generator 1 and is directly connected with the lifting hydraulic cylinder 12, and the bracket 13 is used for dispersing the stress of the direct-current high-voltage generator 1 in the lifting and falling processes;
the base 14 is used for supporting the direct current high voltage generator 1, and the base 14 is provided with a limiting buckle for fixing the direct current high voltage generator 1 in a test state. And a position and angle sensor is arranged on the test platform chassis 8 and used for detecting whether the direct current high voltage generator 1 is lifted to be vertical or falls back to a lying position or not, and judging a result to be used by the logic locking of the hydraulic cylinder.
The hoop 15 and the hoop hydraulic cylinder 16 are positioned at the top end of the bracket 13 and used for fastening the direct current high-voltage generator 1 and the bracket 13 together in the lifting and falling processes, and the switching power of the hoop 15 is provided by the hoop hydraulic cylinder 16.
The following protection logic locking exists among the hoop hydraulic cylinder 16, the lifting hydraulic cylinder 12 and the limit buckle:
(1) for hoop hydraulic cylinder 16:
when the lifting hydraulic cylinder 12 acts or the direct current high-voltage generator 1 is in a lying state, the hoop hydraulic cylinder 16 cannot act;
when the direct-current high-voltage generator 1 is lifted to be vertical, and the base 14 and the test platform chassis 8 are fastened through the limiting buckle, the hoop 15 can separate the bracket 13 from the direct-current high-voltage generator 1;
when the dc high voltage generator 1 is separated from the bracket 13, the hoop 15 needs to be kept separated, and the hoop hydraulic cylinder 16 cannot be actuated.
(2) For the lifting hydraulic cylinder 12:
when the direct current high voltage generator 1 is separated from the bracket 13, no action limitation exists;
when the direct current high-voltage generator 1 is combined with the bracket 13, the hoop 15 is required to be folded to tightly hold the direct current high-voltage generator 1, and the holding lifting hydraulic cylinder 12 can act;
when the dc high voltage generator 1 is lifted vertically, if the bracket 13 and the dc high voltage generator 1 need to be separated, the lifting hydraulic cylinder 12 can be operated after the base 14 and the test platform chassis 8 are fastened and the anchor ear 15 is in a separated state.
4) Onsite transport section
The on-site transfer part comprises two groups of wheels 17 arranged below the test platform chassis 8, a steering platform 18 connected with the wheels 17 and a traction pull rod 19 connected with the steering platform 18. The wheels 17 are solid rubber wheels bearing 5 tons in total, and a traction pull rod 19 in front of the steering platform 18 can be pulled by a forklift, a trailer and the like, so that the platform is convenient to transport in a station.
The pull rod 9 can be turned up to the vertical in the test state to save space. When the towing vehicle is used for towing, the pull ring at the top of the towing pull rod 19 can be hung in the bolt at the tail of the towing vehicle, so that a 2-degree-of-freedom towing system is formed between the towing vehicle, the steering platform 18 and the test platform body. The steering platform 18 can freely turn at 180 degrees, so the system can enable the test platform to steer at the maximum steering angle of 180 degrees in a transformer substation or a converter station, is convenient to drive on a narrow road surface in the station under the condition of no hoisting assistance, can steer in situ and can enter a valve hall entrance at a three-way intersection. If the used vehicle is an electric forklift, the test platform can enter a converter valve hall under the condition of not using fuel power, and the requirement that fuel waste gas cannot be discharged in the valve hall is met.
Besides the 4 parts, the test platform is also attached with accessories such as a cable coil, a high-voltage expanded-diameter conductor, a power socket, an alarm lamp, a safety isolation belt and the like.
The external maximum dimensions of the test platform when transported in the field are: 7.6 meters long, 2.1 meters wide and 2.4 meters high, and the total weight is less than 4.5 tons.
The embodiment of the invention also provides a use method of the mobile +/-800 kV direct-current withstand voltage test platform, which comprises two stages of test arrangement of the test platform in the converter station and test collection of the test platform in the converter station.
The test platform is used in the test arrangement stage in the converter station as follows:
1.1) positioning and fixing of test platform
The test platform is pulled to the vicinity of the equipment to be tested by a forklift or a trailer in the convertor station, and the safety distance between the test platform and the equipment to be tested and other nearby equipment needs to be ensured; the towing vehicle is then driven away from the test area and the 6 stand legs 9 are brought into close contact with the ground and the test platform is leveled in the manner of a manual rocker.
1.2) lifting of the direct-current high-voltage generator 1
Connect the test platform power, start the hydraulic pressure station, operation hydraulic controller extends and lifts hydraulic cylinder 12, lift bracket 13 and direct current high voltage generator 1 to the perpendicular together, it is fixed with base 14 and platform chassis 8 of direct current high voltage generator 1 to close spacing buckle, operation hydraulic controller passes through staple bolt pneumatic cylinder 16 and separates staple bolt 15, lift hydraulic cylinder 12 through hydraulic controller shrink afterwards, fall back bracket 13 to the position of lying down, close the hydraulic pressure station at last. Before this step, if the load short-circuit current is large, the current-limiting resistor 3 needs to be installed.
1.3) test connection
And completing the wiring of a test loop including a test platform according to the relevant standard of the extra-high voltage withstand voltage test.
The use process of the test platform in the test acceptance stage of the converter station is as follows:
2.1) removing the connection
Removing all test connection wires;
2.2) dropping of the DC high-voltage generator 1
Starting a hydraulic station, operating a hydraulic controller to extend the lifting hydraulic cylinder 12, lifting the bracket 13 to be vertical, and then operating the hydraulic controller to close the hoop 15 through the hoop hydraulic cylinder 16; separating the limiting buckles to release the fixation between the base 14 of the direct current high-pressure generator 1 and the platform chassis 8, contracting the lifting hydraulic cylinder 12 through the hydraulic controller, dropping the bracket 13 together with the direct current high-pressure generator 1 to the lying position, and finally closing the hydraulic station;
2.3) test platform transfer
The 6 standing feet 9 are separated from the ground in a manual rocker mode, and the test platform is pulled out of the test area by using a traction vehicle.
In the whole arrangement and collection stage, only the hydraulic system needs to be operated, and hoisting by a crane is not needed.
Under the condition that the test is carried out without entering a converter valve hall, the supporting structure part and the on-site transferring part of the platform can be replaced by a self-powered flat car, namely the platform is transformed into a test car, so that the road transportation is facilitated, and the hoisting link when the platform enters a converter station can be reduced;
in further embodiments, the 6 standing feet 9 of the support structure portion can be replaced from a manual rocker mode of operation to a hydraulically assisted type, and also using the hydraulic station of the platform head as a power source;
in another embodiment, the double-layer rigid grading ring 2 can be replaced by a double-layer or single-layer inflatable grading ring, which can reduce the transportation length of the platform, but can increase the time for on-site arrangement and collection due to on-site loading, unloading and inflation.
The invention has the following beneficial effects:
1. the invention provides a whole set of hydraulic mechanism capable of automatically lifting on a test site of a converter station, which can complete the arrangement and the collection and the arrangement of a DC withstand voltage test of 800kV at most under the condition of no hoisting by manually operating a hydraulic controller, and particularly can test equipment in a valve hall;
2. according to the invention, a protection logic lock exists between the hydraulic mechanism (namely the lifting hydraulic cylinder 12 and the hoop hydraulic cylinder 16) and the limit buckle, so that the equipment toppling possibly caused by misoperation in the arrangement and collection process of the test platform can be avoided;
3. the invention combines the field test device of the direct current high voltage generator 1 with the flat plate transfer device with the steering platform 18, so that the test platform can be conveniently steered and flexibly arranged in the converter station and the valve hall, the compilation of the test scheme of the direct current equipment is simplified, the mutual influence between the test and other operation surfaces is reduced, and the test cost is reduced.
4. The device has the characteristics of convenience in road transportation and field transportation, rapidness in test expansion, small occupied area and low maintenance frequency, and reduces the time and personnel requirements for field test and maintenance.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are 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 (9)
1. The utility model provides a portable 800kV direct current withstand voltage test platform which characterized in that: the device comprises a pressure test part, a supporting structure part, a layout lifting part and an on-site transferring part;
the voltage withstand test part comprises a direct-current high-voltage generator, a double-layer hard equalizing ring and an operation part, wherein the double-layer hard equalizing ring and the direct-current high-voltage generator are integrally arranged, and the operation part is used for controlling the direct-current high-voltage generator to generate 0-800kV negative direct-current voltage which is used as a power supply for testing a direct-current transmission device with the highest +/-800 kV;
the supporting structure part comprises a test platform chassis, a standing foot arranged at the bottom of the test platform chassis and a lifting lug arranged on the platform chassis, wherein the standing foot is used for stabilizing the test platform chassis during field test and road transportation, and the lifting lug is used for lifting the platform down or up to a flat car for transportation when the platform enters or leaves the station;
the arrangement lifting part adopts a hydraulic power-assisted mechanism to realize the automatic lifting and collecting functions of the test platform and complete the conversion of the platform between a test state and a transportation state;
the transportation transfer part comprises wheels arranged below a chassis of the test platform, a steering platform connected with the wheels and a traction pull rod connected with the steering platform, the steering platform can freely turn for 180 degrees, and the traction pull rod is used for being connected with a traction vehicle.
2. The mobile ± 800kV dc withstand voltage test platform of claim 1, wherein: the withstand voltage test part also comprises a current-limiting resistor, and the current-limiting resistor is detachably arranged at the center of the double-layer hard grading ring.
3. The mobile ± 800kV dc withstand voltage test platform of claim 1, wherein: the arrangement lifting part comprises a hydraulic station, a lifting hydraulic cylinder, a bracket, a base, a hoop hydraulic cylinder and a hydraulic controller for operating the lifting hydraulic cylinder;
the hydraulic station is used for providing power for the lifting hydraulic cylinders and the hoop hydraulic cylinders, and the pair of lifting hydraulic cylinders are positioned on two sides of the bracket and used for lifting the bracket and the reactor to be vertical for testing and falling back after the testing;
the bracket is positioned at the lower part of the direct-current high-voltage generator and is directly connected with the lifting hydraulic cylinder, and the bracket is used for dispersing the stress of the direct-current high-voltage generator in the lifting and falling processes;
the base is used for supporting the direct-current high-voltage generator, and a limiting buckle is arranged on the base and used for fixing the direct-current high-voltage generator in a test state;
the chassis of the test platform is provided with a position and angle sensor which is used for detecting whether the direct current high voltage generator is lifted to be vertical or falls back to a lying position or not and judging the result to be used by the logic locking of the hydraulic cylinder;
the hoop and the hoop hydraulic cylinder are positioned at the top end of the bracket and used for fastening the direct-current high-voltage generator and the bracket together in the lifting and falling processes, and the opening and closing power of the hoop is provided by the hoop hydraulic cylinder.
4. The mobile ± 800kV dc withstand voltage test platform of claim 3, wherein: the following protection logic locking exists among the hoop hydraulic cylinder, the lifting hydraulic cylinder and the limiting buckle:
(1) for the hoop hydraulic cylinder:
when the lifting hydraulic cylinder acts or the direct-current high-voltage generator is in a lying state, the hoop hydraulic cylinder cannot act;
when the direct-current high-voltage generator is lifted to be vertical, and the base and the chassis of the test platform are fastened through the limiting buckle, the hoop can separate the bracket from the direct-current high-voltage generator;
when the direct-current high-voltage generator is separated from the bracket, the hoop needs to be kept in a separated state, and the hoop hydraulic cylinder cannot act;
(2) for the lifting hydraulic cylinder:
when the direct-current high-voltage generator is separated from the bracket, no action limitation exists;
when the direct-current high-voltage generator is combined with the bracket, the direct-current high-voltage generator can be held tightly by closing the hoop, and the holding lifting hydraulic cylinder can act;
when the direct current high voltage generator is lifted to be vertical, if the bracket and the direct current high voltage generator need to be separated, the lifting hydraulic cylinder can act only when the base is fastened with the chassis of the test platform and the anchor ear is in a separated state.
5. The mobile ± 800kV dc withstand voltage test platform of claim 1, wherein: the stand foot uses a manual rocker or a hydraulic boosting type to operate the lifting of the chassis of the test platform.
6. The mobile ± 800kV dc withstand voltage test platform of claim 1, wherein: the diameter of the double-layer hard grading ring is 300mm, and the requirement of no discharge under 800kV negative polarity direct current voltage is met.
7. The mobile ± 800kV dc withstand voltage test platform of claim 1, wherein: the direct-current high-voltage generator comprises a middle transformer positioned at the bottom and a single-section voltage-multiplying cylinder positioned above the middle transformer.
8. A method of using the mobile ± 800kV dc withstand voltage test platform according to any of claims 1-7, wherein: the method comprises two stages of test arrangement of a test platform in a converter station and test collection of the test platform in the converter station; wherein
The use process of the test platform in the test arrangement stage in the converter station is as follows:
1.1) positioning and fixing of test platform
The test platform is pulled to the vicinity of the equipment to be tested by a forklift or a trailer in the convertor station, and the safety distance between the test platform and the equipment to be tested and other nearby equipment needs to be ensured; driving the traction vehicle away from a test area, tightly contacting the ground by using an operation station foot, and leveling the test platform;
1.2) lifting of DC high-voltage generator
Connecting a test platform power supply, starting a hydraulic station, operating a hydraulic controller to extend a lifting hydraulic cylinder, lifting a bracket together with a direct-current high-voltage generator to be vertical, closing a limiting buckle to fix a base of the direct-current high-voltage generator and a platform chassis, operating the hydraulic controller to separate a hoop through the hoop hydraulic cylinder, then contracting the lifting hydraulic cylinder through the hydraulic controller, returning the bracket to a lying position, and finally closing the hydraulic station;
1.3) test connection
Completing test loop wiring including a test platform according to relevant standards of an extra-high voltage withstand voltage test;
the use process of the test platform in the test acceptance stage of the converter station is as follows:
2.1) removing the connection
Removing all test connection wires;
2.2) falling back of the DC high-voltage generator
Starting the hydraulic station, operating the hydraulic controller to extend the lifting hydraulic cylinder, lifting the bracket to be vertical, and then operating the hydraulic controller to close the hoop through the hoop hydraulic cylinder; separating the limiting buckle to release the fixation between the base of the direct-current high-voltage generator and the platform chassis, contracting the lifting hydraulic cylinder through the hydraulic controller, dropping the bracket together with the direct-current high-voltage generator to the lying position, and finally closing the hydraulic station;
2.3) test platform transfer
The operating station foot leaves the ground, and the test platform is pulled out of the test area by using a traction vehicle.
9. The use method of the mobile ± 800kV direct current withstand voltage test platform according to claim 8, characterized in that: before step 1.2), if the load short-circuit current is large, a current-limiting resistor is arranged at the center of the double-layer hard grading ring.
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| CN114217188A (en) * | 2021-12-17 | 2022-03-22 | 江苏锦秀高压电器有限公司 | Power frequency does not have protection device for partial discharge test complete sets |
| CN116908631A (en) * | 2023-07-19 | 2023-10-20 | 苏州华电电气股份有限公司 | Integrated impact test platform |
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