CN113777456B - Full-closed gas-insulated high-voltage switch field insulation test device - Google Patents
Full-closed gas-insulated high-voltage switch field insulation test device Download PDFInfo
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- CN113777456B CN113777456B CN202111170299.1A CN202111170299A CN113777456B CN 113777456 B CN113777456 B CN 113777456B CN 202111170299 A CN202111170299 A CN 202111170299A CN 113777456 B CN113777456 B CN 113777456B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The application provides a totally enclosed gas-insulated high-voltage switch field insulation test device. According to the method, the test bus is connected to the proper position of the internal connection conductor between the gas-insulated high-voltage switch body and the interface element, and the isolation device and the grounding device are arranged in the gas-insulated cavity formed by the test bus sleeve. In the working state, the isolating device is in a brake-separating state, and the grounding device is in a brake-closing state; when the field insulation test is carried out, the isolation device can be directly arranged in a closing state, and the grounding device is in a separating state; when single-phase test is carried out, the switching grounding device and the transformer grounding device corresponding to the non-test phase are simultaneously in a closing state. From this, this application can directly carry out insulation test after inserting outside test transformer, and need not dismouting test busbar respectively, can accomplish insulation test fast to resume the transformer substation power supply fast after the test.
Description
Technical Field
The application relates to an insulation test system, in particular to a field insulation test device for a totally-enclosed gas-insulated high-voltage switch.
Background
For a fully enclosed gas-insulated high-voltage switch, all the high-voltage components should be placed in a gas-insulated medium, and the outside of the insulating medium should be grounded, and in general, the gas-insulated medium is covered by a grounded metal shell.
In the construction area of the transformer substation, when the totally enclosed gas-insulated high-voltage switch is in butt joint with other equipment of the transformer substation, in order to ensure the safety of the totally enclosed gas-insulated high-voltage switch, an insulating medium should be selected as an interface element, for example, a basin insulator between the gas-insulated high-voltage switch and a rigid gas-insulated transmission line, a cable accessory between the gas-insulated high-voltage switch and a cable, an oil/SF 6 sleeve between the gas-insulated high-voltage switch and or an oil transformer, and the like, so that the gas-insulated medium inside the high-voltage switch is isolated from other equipment.
The insulation test is needed after the field installation or maintenance of the totally enclosed gas insulated high voltage switch, and the field insulation test is generally carried out according to the following three steps:
step one: before the test, SF6 gas between the interface element and the gas-insulated high-voltage switch is firstly extracted to be communicated with the outside air, then a connecting conductor is replaced and installed at a proper position at the top end of the sleeve, the connecting conductor is electrically connected with the element of the gas-insulated high-voltage switch to introduce a test bus, and the tail end of the test bus is electrically connected with the SF 6/air sleeve. Finally, air between the external interface element and the SF 6/air sleeve is extracted, and SF6 gas with rated pressure is refilled;
step two: when the insulation test is carried out, the SF 6/air sleeve is connected with an external test transformer through an overhead wire, and high-voltage power generated by the external test transformer can be connected into the gas insulation high-voltage switch.
Step three: after the test, SF6 gas between the external interface element and the SF 6/air bushing is extracted, the test bus, the connection conductor and the SF 6/air bushing are removed, and finally SF6 gas with rated pressure is refilled.
In the existing field insulation test mode, when the gas insulation high-voltage switch is directly connected with an external interface element, SF6 gas needs to be extracted and re-injected in the field insulation test, and connection conductors are installed respectively. The existing experimental mode needs to execute a large amount of preparation work, set insulation tests respectively carried out on three phases of the gas-insulated high-voltage switch, and sequentially carry out the steps on each corresponding phase. The test bus is required to be disassembled and assembled in each test, so that the transformer substation capable of quickly recovering power supply is not facilitated.
Disclosure of Invention
The utility model provides a to the not enough of prior art, provides a totally enclosed gas-insulated high-voltage switch field insulation test device, this application inserts test busbar at the suitable position of internal connection conductor between gas-insulated high-voltage switch body and the interface element, sets up isolating device in test busbar, sets up earthing device between isolating device and interface element to with the end-to-end connection of test busbar to SF6 air sleeve. The utility model discloses a through optimizing circuit topology structure and directly trigger corresponding equipment through each switch and switch the operational connection state according to test needs to link to each other SF 6/air sleeve pipe and test transformer through the overhead line when experimental can conveniently carry out every looks insulation test in a flexible way, guarantee test efficiency and improve test security. The application specifically adopts the following technical scheme.
First, in order to achieve the above object, a field insulation test device for a totally enclosed gas-insulated high-voltage switch is provided, which includes: one end of the test bus is electrically connected with the gas-insulated high-voltage switch and the external interface element at the same time, and the other end of the test bus is connected with the test transformer; the isolating device is arranged in the test bus and connected between the gas-insulated high-voltage switch and the test transformer, a conductive path is formed between the gas-insulated high-voltage switch and the test transformer in a closing state, and the gas-insulated high-voltage switch and the test transformer are isolated from being electrically connected in a separating state; the grounding device is arranged in the test bus and arranged between the isolating device and the external interface element, and triggers the gas-insulated high-voltage switch to be grounded during closing.
Optionally, the field insulation test device for a totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein the gas-insulated high-voltage switch is connected with an external interface element in a sealing manner by a sleeve, an internal connection conductor is arranged in the sleeve, one end of the grounding device is connected with the internal connection conductor, and the other end of the grounding device is connected with the isolation device.
Optionally, the fully enclosed gas-insulated high-voltage switch field insulation test apparatus according to any one of the preceding claims, wherein the external interface element is a cable attachment.
Optionally, the field insulation test device for a totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein each phase of the grounding device is connected with a corresponding phase of the substation equipment through an external interface element, each phase of the isolation device is connected with a corresponding phase of the test transformer through a test bus, and the opening and closing states of the device connected with each phase and the isolation device are respectively operated separately in a single phase.
Optionally, the fully-enclosed gas-insulated high-voltage switch field insulation test device according to any one of the above claims, wherein three-phase SF 6/air bushings are respectively connected between the test bus and the test transformer, and each phase SF 6/air bushing is respectively connected with a corresponding phase of the grounding device matched with the phase; the transformer substation equipment is respectively connected with three-phase cable accessories, and each phase of cable accessory is respectively connected with a corresponding phase of the grounding device matched with the phase; each grounding device is respectively connected between the high-voltage side of the corresponding phase of the transformer substation equipment and the corresponding port of the gas-insulated high-voltage switch connected with the high-voltage side.
Optionally, the field insulation test device for the totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein only one phase of SF 6/air sleeve is connected between the test bus and the test transformer, the SF 6/air sleeve is simultaneously connected with the isolation devices respectively matched with each phase through the test bus, and the grounding devices corresponding to the isolation devices are respectively connected to the corresponding phase of the high-voltage side in the transformer substation equipment through the external interface element.
Optionally, the fully-enclosed gas-insulated high-voltage switch field insulation test device according to any one of the above, wherein, when in operation, the isolation device is in a brake-off state, and the high-voltage switch grounding device is in a brake-off state; when the gas-insulated high-voltage switch is subjected to field insulation test, the isolation device is in a closing state, and the high-voltage switch grounding device is in a breaking state; during single-phase test, the grounding device and the high-voltage switch grounding device corresponding to the non-test phase are both in a closing state at the same time.
Optionally, the field insulation test device for a totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein the isolation device comprises: the first end of the moving contact connecting conductor is electrically connected with the SF 6/air sleeve through a test bus, and a hollow guide supporting groove is formed in the moving contact connecting conductor; the isolating device fixed contact is electrically connected with the high-voltage side of the transformer substation equipment through an external interface element, is arranged at the outer side of the second end of the movable contact connecting conductor and is opposite to the opening end of the hollow guide supporting groove; the isolating device moving contact is electrically connected with the moving contact connecting conductor and is arranged in the hollow guide supporting groove in a sliding manner; in a closing state, the moving contact of the isolating device slides to the second end of the connecting conductor of the moving contact along the hollow guide supporting groove, and is in electrical contact with the static contact of the isolating device; in the opening state, the moving contact of the isolating device is arranged in the hollow guide supporting groove and is separated from electrical contact with the static contact of the isolating device.
Optionally, the field insulation test device for the totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein the isolating device is sealed by an isolating device shell, two ends of the isolating device shell are respectively connected with the fixed contact of the isolating device and a moving contact connecting conductor, and the moving contact connecting conductor extends from one side end of the isolating device shell to a position close to the opposite side of the fixed contact of the isolating device; the isolation device further includes: the first internal transmission piece is arranged at the top of the movable contact connecting conductor and meshed with the movable contact of the isolation device; the bottom end of the insulating transmission rod is connected with the first internal transmission piece and synchronously rotates with the first internal transmission piece; the sealing coupler is arranged at the top of the isolation device and is connected with the top end of the insulating transmission rod; the operating mechanism is arranged outside the top end of the isolating device shell, and drives the insulating transmission rod to drive the first internal transmission piece through the sealing coupler so that the moving contact connecting conductor slides along the hollow guide supporting groove.
Optionally, the field insulation test device for the totally enclosed gas-insulated high-voltage switch according to any one of the above claims, wherein the grounding device is sealed by a grounding device shell, a second internal transmission member and a grounding moving contact are arranged in the grounding device shell, the bottom of the grounding device shell is connected with an internal conductive shell, and an external interface element and an internal conductor electrically connected with the isolation device are arranged inside the internal conductive shell; the inner conductor is provided with a grounding static contact; the top of the grounding device shell is provided with a second internal transmission part, the lower side of the second internal transmission part is connected with a grounding movable contact, and the grounding movable contact is driven by the second internal transmission part to slide downwards to be in electrical contact with the grounding fixed contact or driven by the second internal transmission part to slide upwards to be separated from electrical contact with the grounding fixed contact.
Advantageous effects
The test bus is connected to the proper position of the internal connection conductor between the gas-insulated high-voltage switch body and the interface element, reliable insulation isolation is provided by utilizing the gas-insulated cavity formed by the test bus sleeve, and the isolation device and the grounding device are arranged in the gas-insulated cavity. According to the power supply device, under the working state, the isolation device is arranged in the opening state, and the grounding device is arranged in the closing state so as to provide stable power supply output; when in field insulation test, the isolation device is directly arranged in a closing state, and the grounding device is in a separating state; when single-phase test is carried out, the switching grounding device and the transformer grounding device corresponding to the non-test phase are simultaneously in a closing state. From this, this application can directly carry out insulation test after inserting outside test transformer, and need not dismouting test busbar respectively, can accomplish insulation test fast to thereby the power supply of recovery transformer substation rapidly is fast to the switching state after the test is accomplished.
In addition, the self-connecting device of the application directly realizes the switching of the on-off state of the circuit through the switch structure in the gas insulation cavity, so that the self-connecting device can directly drive the internal contact of the switch structure to switch the on-off state of the internal contact through the transmission piece of the trigger switch from the outside, thereby controlling the electric connection state between each phase of external interface element and the test transformer, and conveniently and flexibly carrying out each phase of insulation test. In this application, the switching of each phase circuit break-make state need not manual operation electric connection pipeline can be realized, consequently, the direct connection device security performance of this application is higher.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and explain the application and do not limit it. In the drawings:
FIG. 1 is a schematic diagram of a fully enclosed gas insulated high voltage switch field insulation test apparatus of the present application;
FIG. 2 is a schematic circuit diagram of the apparatus of the present application in a first implementation;
FIG. 3 is a schematic circuit diagram of the apparatus of the present application in a second implementation;
FIG. 4 is a schematic view of the internal structure of an isolation device used in the apparatus of the present application;
FIG. 5 is a schematic view of the internal structure of a grounding device employed in the device of the present application;
in the figure, 1 denotes a gas-insulated high-voltage switch; 2 represents an external interface element; 3 represents a cable; 4 represents a connection conductor; 5 denotes a grounding device; 6 represents an isolation device; 8 represents a test busbar; 9 denotes an SF 6/air bushing; 10 denotes an overhead line; 11 denotes a test transformer; 51 denotes a second internal transmission member; 52 denotes a ground moving contact; 53 denotes a ground fixed contact; 54 denotes an inner conductor; 55 denotes an inner guide housing; 56 denotes an insulating chamber of the earthing device; 60 denotes a basin-type insulator; 61 denotes an isolation device stationary contact; 62 denotes a seal coupling; 63 denotes an insulating transmission rod; 64 denotes a first internal transmission; 66 denotes an isolation device moving contact; 67 denotes a moving contact connecting conductor; 68 represents an isolator housing; 69 represents an insulating chamber of the isolation device.
Detailed Description
In order to make the objects and technical solutions of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as referred to in this application means that each exists alone or both.
The meaning of "inner and outer" in this application means that the direction from the transmission member to the contact inside the housing is inner and vice versa with respect to the isolating device or the grounding device itself; and not as a specific limitation on the device mechanisms of the present application.
As used herein, "connected" means either a direct connection between elements or an indirect connection between elements via other elements.
The meaning of "up and down" as used herein refers to the direction from the driving member to the contact inside the housing being down when the user is facing the isolation device or the grounding device, and vice versa, rather than specifically limiting the device mechanism of the present application.
Fig. 1 is a field insulation test device for a totally enclosed gas insulated high voltage switch according to the present application, which is used in the case of performing a field insulation test on a totally enclosed gas insulated high voltage switch. The utility model provides a totally enclosed gas-insulated high tension switchgear field insulation test device includes:
a test bus 8 having one end electrically connected to the gas-insulated high-voltage switch 1 and the external interface element 2 at the same time and the other end connected to the test transformer 11; the gas-insulated high-voltage switch 1 is connected with the external interface element 2 in a sealing way by a sleeve, and an internal connecting conductor 4 is arranged in the sleeve
The isolating device 6 is arranged in the test bus and connected between the gas-insulated high-voltage switch 1 and the test transformer 11, a conductive path is formed between the gas-insulated high-voltage switch 1 and the test transformer 11 in a closing state, and the gas-insulated high-voltage switch 1 and the test transformer 11 are isolated from being electrically connected in a separating state;
and the grounding device 5 is arranged in the test bus and is arranged between the isolating device 6 and the external interface element 2, one end of the grounding device 5 is connected with the internal connecting conductor 4, and the other end of the grounding device 5 is connected with the isolating device 6, so that the gas-insulated high-voltage switch 1 is triggered to be grounded when the switch is closed.
Therefore, the circuit structure of fig. 2 or 3 can be formed through the isolation device 6 and the grounding device, the high-voltage power devices such as a power transformer and the like are directly connected through the cable 3 and the external interface element 2 realized by the cable accessory, one end of the test bus sleeve is arranged in the SF6 air chamber through the external interface element 2, and the electrical communication is realized through the external interface element 2 and the gas-insulated high-voltage switch, so that the quick switching of the on-off state of the circuit is realized through the switch structure arranged in the SF6 air chamber. Therefore, the insulation test can be carried out by switching on and off states of the switches only by connecting the external test transformer, and the trouble that the test bus needs to be connected before the test and the test bus needs to be removed after the test in the existing mode is avoided. The insulation test can be rapidly completed and the normal operation of the electric power device connected with the external interface element can be recovered through switching the on-off states of the isolation device 6 and the grounding device 5.
In a specific setting, as shown in fig. 2, each phase of the grounding device 5 in the fully-enclosed gas-insulated high-voltage switch field insulation test device is connected with a corresponding phase set by the external interface element 2, each phase of the isolation device 6 in the high-voltage switch field insulation test device is connected with a corresponding phase of the test transformer 11 through the test bus 8, and the switching-on and switching-off states of the device connected with each phase and the isolation device are set to be single-phase separated operation respectively. Therefore, when the insulation test is carried out, the electric connection state between each phase of oil/SF 6 sleeve and the test transformer can be controlled from the outside through the switch, so that each phase of insulation test can be conveniently and flexibly carried out, and the safety performance is higher.
The wiring structure of the high-voltage switch field insulation test device matched with the single-phase independent operation can further arrange three-phase SF 6/air bushings 9 between the test bus 8 and the test transformer 11 in the implementation mode of FIG. 2, and the three-phase SF 6/air bushings 9 are respectively connected with a test device isolation device matched with the phase; and likewise, each phase of external interface element 2 is respectively connected with a corresponding phase of the grounding device matched with the phase; while the test device is electrically connected with the external interface element 2 to which the cable matching the phase is connected, with the grounding device matching the phase. The test buses among the isolating device, the grounding device and the interface element are all set to be three phases, the isolating device, the grounding device, the external interface element and the gas-insulated high-voltage switch are respectively and singly corresponding to each phase SF 6/air sleeve 9, and three-phase independent test is realized through single-phase separated operation of the isolating device and the grounding device, so that mutual noninterference among each phase in the test process is ensured.
The test bus in the three-phase independent mode can select three phases and is provided with a three-phase SF 6/air sleeve. Reference is made to fig. 2 for an electrical schematic.
In other implementations, three-phase electrical connections may also be made by combining the three phases into one phase, configuring a one-phase SF 6/air bushing, through the electrical schematic shown in fig. 3. In this way, the three-phase common box structure can be adopted to arrange the three-phase conductive structures in the same shell, or the three-phase sub-box structure can be arranged to seal the three-phase conductive structures in the respective shells.
In the case of three-phase combined control, the cable 3 external to the device can be connected to the same set of test equipment containing three phases via the external interface element 2, and the test bus of the test equipment can be connected to the SF 6/air bushing of the test transformer 11. In order to further simplify the internal circuit structure of each test device, in this way, in the manner shown in fig. 3, only one phase SF 6/air bushing 9 is connected between the test busbar 8 and the test transformer 11, the SF 6/air bushing 9 is simultaneously connected to a plurality of isolation devices matched with each phase through the test busbar, the grounding device 5 corresponding to each isolation device 6 is respectively connected to the corresponding phase of the cable through the oil/SF 6 bushing, and the grounding device provided in each test device is simultaneously electrically connected to the external interface element 2 and the corresponding port of the gas-insulated high-voltage switch 1.
Therefore, the terminal SF 6/air sleeve of each connecting device can be combined into a set, so that connecting pipelines among phases are simplified, and an insulation test function is realized.
Whether the test device adopts a three-phase common box mechanism or a three-phase box structure, the isolation device 6 can be constructed in the mode shown in fig. 4, so that the switching and control of the on-off state of the connecting conductor 4 for connecting each power device in the test bus can be realized. The insulator 6 is sealed by an insulator housing 68, and an insulator insulation chamber 69 formed inside the insulator housing 68 is filled with an insulating gas such as SF 6. The two ends of the isolating device shell 68 are respectively provided with the isolating device static contact 61 and the test transformer connecting conductor 671 through the basin-type insulator 60. Wherein the outside of the test transformer connection conductor 671 is connected to the test transformer 11 via the test bus 8, the SF 6/air bushing 9 and the overhead line 10. The inner side of the test transformer connection conductor 671 is connected to the isolation device moving contact 66 through a moving contact connection conductor 67. The center conductor of the basin insulator 60 connected with the moving contact connecting conductor 67 is electrically connected with the test transformer, a first end of the moving contact connecting conductor 67 is electrically connected with the SF 6/air sleeve 9 through the test bus 8, and the other end of the moving contact connecting conductor extends inwards to form a hollow guide supporting groove to accommodate the moving contact 66 of the isolation device. The open end of the hollow guide supporting groove is opposite to the fixed contact 61 of the isolating device. The fixed contact 61 of the isolating device is electrically connected with the external interface element 2 and the high-voltage side of the electric device connected with the cable through the central conductor of the side basin insulator 60, is arranged on the outer side of the movable contact connecting conductor 67, and is horizontally aligned with the opening end of the hollow guide supporting groove.
Thereby, the moving contact connecting conductor 67 extends from one end of the isolating device housing 68 to be close to the isolating device stationary contact 61, and the isolating device moving contact 66 is electrically connected by sliding connection with the hollow guiding support groove inside the moving contact connecting conductor 67. The moving contact 66 of the isolating device can be driven by the insulating transmission rod 63 arranged at the top of the moving contact connecting conductor 67 through the meshing transmission of the first internal transmission member 64 arranged at the top of the moving contact connecting conductor 67, so that the connection position of the moving contact 66 of the isolating device can be switched. An insulating transmission rod 63 whose bottom end is fixedly connected with the first internal transmission member 64 or engaged with the internal transmission member, and rotates in synchronization with the first internal transmission member 64; the sealing coupling 62 may be arranged on the top of the isolation device 6 and fixedly connected with the top end of the insulating transmission rod 63 or engaged with the top end of the insulating transmission rod for synchronous transmission. Thus, the operating mechanism disposed outside the top end of the isolating device housing 68 may be configured as an operating handle or a power mechanism, which interfaces with and drives the insulating transmission rod 63 through the sealing coupling 62, and the insulating transmission rod drives the first internal transmission member 64 to slide the isolating device moving contact 66 to one side along the hollow guiding and supporting slot, so that the isolating device moving contact 66 slides to one end along the hollow guiding and supporting slot, is in electrical contact with the isolating device fixed contact 61, and places the isolating device 6 in a closing state; or the movable contact connecting conductor 67 slides to the other side along the hollow guide supporting groove, so that the movable contact 66 of the isolation device slides to the other end along the hollow guide supporting groove, and is separated from electrical contact with the fixed contact 61 of the isolation device, and the isolation device 6 is placed in a brake-separating state.
Therefore, the isolation device 6 is arranged in a closing state, the grounding device 5 and the transformer grounding device 7 are simultaneously in a separating state, and the equipment connected with the conductive cable and the gas-insulated high-voltage switch 1 are connected, so that the electric device can be normally operated in an operating state. The utility model provides a still accessible sets up isolating device 6 in the combined floodgate state, and switches on the test transformer 11 of power device and test end, sets up power device under the scene insulation test state, and at this moment, correspondingly is in the brake-separating state with earthing device 5, can realize the insulation test to power device. During single-phase test, the grounding device 5 and the grounding device corresponding to the non-test phase are directly in a closing state at the same time, so that the grounding protection of the test circuit can be realized, and meanwhile, the circuit is prevented from interfering with other phase circuits to perform test.
Considering that the grounding device 5 comprises two states of switching-on grounding and switching-off operation, it can be realized by the switch structure shown in fig. 5. In fig. 5, the switch structure is sealed by an inner conductive case 55 and a grounding device case, and an insulating chamber 56 of the grounding device formed inside the inner conductive case 55 is filled with an insulating gas such as SF 6. Both ends of the inner conductive housing 55 are electrically connected to the gas-insulated high-voltage switch and the isolation device 6 through basin insulators 60, respectively. The top of the inner conductive housing 55 is provided with a ground moving contact 52 and a second internal transmission member 51 by a switch housing seal. The grounding moving contact 52 can be realized by a grounding metal rod, and the lower end of the grounding moving contact can extend downwards into the inner guide shell 55 from the bottom of the grounding device shell and is electrically connected with the grounding fixed contact 53 arranged on the inner conductor 54. The second internal transmission member 51 is disposed at the top of the grounding device housing, and the operating mechanism may be an operating handle or a power mechanism for realizing the docking, and the operating mechanism may be directly disposed outside the grounding device housing. The operating mechanism drives the moving contact 52 to slide up and down along the contact seat in a manual or electric mode through the second internal transmission piece 51, so that the lower side of the moving contact is connected with the top of the grounding moving contact 52, and the moving contact is driven by the second internal transmission piece 51 to slide downwards to be in electric contact with the grounding fixed contact 53, so that the single-phase grounding of the electric power device connected with the external interface element 2 and the oil/SF 6 outlet sleeve is realized, the other phases can be subjected to high-voltage insulation test, or the moving contact is driven by the second internal transmission piece 51 to slide upwards and be separated from the electric contact with the grounding fixed contact 53.
In other implementations, the inner conductive housing 55 of the grounding device 5 and the isolation device housing 68 of the isolation device 6 may be integrally connected with the bushing of the test busbar 8. If the test device comprises a three-phase SF 6/air sleeve and adopts a three-phase common box structure, the other two-phase isolation device which is not tested and the grounding device are switched on during single-phase test. After the test is completed, the SF 6/air sleeve may be grounded and the isolation device and the grounding device may be disconnected.
In summary, this application is through inserting the test busbar at the suitable position of the internal connection conductor between oil/SF 6 wire outlet sleeve and the gas-insulated high-voltage switch, set up isolating device in the test busbar, and set up earthing device between isolating device and oil/SF 6 wire outlet sleeve, set up the end-to-end connection SF6 air sleeve of test busbar, thereby link to each other SF6 air sleeve and test transformer through the overhead line when experimental, can realize the switching to the on-off state of corresponding test busbar electric connection circuit through isolating device, earthing device, thereby correspondingly switch to the test circuit on-off connection state according to experimental needs, in order to save the trouble of original dismouting junction sleeve and conductive line. The isolation device and the grounding device can be operated separately in a single phase, and are matched with the three-phase test bus and the three-phase SF 6/air sleeve to ensure that all phases are not interfered with each other. The three phases can be combined into one phase, the SF 6/air sleeve with one phase is configured, and the same circuit on-off state switching function is realized by utilizing the electric schematic diagram shown in fig. 3 and adopting a three-phase common box structure, wherein the three phases are in the same shell, or a three-phase box structure, wherein the three phases are in respective shells.
Compared with the prior art, the application has the following obvious advantages:
the test device can be connected into a test bus between the gas-insulated high-voltage switch and the electric power device, and units such as an isolation device and a grounding device which are independently operated, an SF 6/air sleeve and the like are arranged in the test bus, so that line switching is realized by directly switching on or off by driving the grounding device 5 and the isolation device 6, the field insulation test requirements of each phase are met, the workload of field test is reduced, and the working efficiency is improved;
2, the test device of the application can control the opening and closing of the isolating device and the grounding device through the external operating mechanism, so that the test object conversion among a plurality of electric devices or among the phases of the same device can be realized, and the safety performance is higher.
The foregoing is merely exemplary of embodiments of the present application and is thus not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.
Claims (8)
1. The utility model provides a totally enclosed gas-insulated high tension switchgear field insulation test device which characterized in that includes:
a test bus (8) having one end electrically connected to the gas-insulated high-voltage switch (1) and the external interface element (2) at the same time and the other end connected to the test transformer (11);
the isolating device (6) is arranged in the test bus and connected between the gas-insulated high-voltage switch (1) and the test transformer (11), a conductive path is formed between the gas-insulated high-voltage switch (1) and the test transformer (11) in a closing state, and the gas-insulated high-voltage switch (1) is blocked from being electrically connected with the test transformer (11) in a separating state;
the grounding device (5) is arranged in the test bus and is arranged between the isolating device (6) and the external interface element (2), and the gas-insulated high-voltage switch (1) is triggered to be grounded during closing;
wherein the isolation device (6) comprises:
a moving contact connecting conductor (67), the first end of which is electrically connected with the SF 6/air sleeve (9) through a test bus (8), and the inside of which is provided with a hollow guide supporting groove;
the isolating device fixed contact (61) is electrically connected with the high-voltage side of the transformer substation equipment through an external interface element (2), is arranged outside the second end of the moving contact connecting conductor (67), and is opposite to the opening end of the hollow guide supporting groove;
an isolating device moving contact (66) which is electrically connected with the moving contact connecting conductor (67) and is arranged in the hollow guide supporting groove in a sliding way;
a first internal transmission member (64) provided on the top of the moving contact connection conductor (67) and engaged with the isolating device moving contact (66);
the bottom end of the insulating transmission rod (63) is connected with the first internal transmission member (64) and synchronously rotates with the first internal transmission member (64);
a sealing coupling (62) which is arranged at the top of the isolation device (6) and is connected with the top end of the insulating transmission rod (63);
the isolating device (6) is sealed by an isolating device shell (68), two ends of the isolating device shell (68) are respectively connected with the isolating device fixed contact (61) and a moving contact connecting conductor (67), and the moving contact connecting conductor (67) extends to a position close to the opposite side of the isolating device fixed contact (61) from one side end of the isolating device shell (68);
the isolation device (6) also comprises
The operating mechanism is arranged outside the top end of the isolating device shell (68), and drives the insulating transmission rod (63) through the sealing coupler (62) to drive the first internal transmission piece (64) so that the moving contact connecting conductor (67) slides along the hollow guide supporting groove;
in a closing state, the moving contact (66) of the isolating device slides to the second end of the connecting conductor (67) of the moving contact along the hollow guide supporting groove, and is in electrical contact with the fixed contact (61) of the isolating device;
in the opening state, the moving contact (66) of the isolating device is arranged in the hollow guide supporting groove and is separated from electrical contact with the static contact (61) of the isolating device.
2. The field insulation test device for the totally enclosed gas-insulated high-voltage switch according to claim 1, wherein the gas-insulated high-voltage switch (1) is connected with an external interface element (2) in a sealing way through a sleeve, an internal connecting conductor (4) is arranged in the sleeve, one end of the grounding device (5) is connected with the internal connecting conductor (4), and the other end of the grounding device (5) is connected with the isolating device (6).
3. The fully enclosed gas-insulated high-voltage switch field insulation test apparatus according to claim 2, wherein the external interface element (2) is a cable accessory.
4. The field insulation test device for the totally enclosed gas-insulated high-voltage switch according to claim 2, wherein each phase of the grounding device (5) is connected with a corresponding phase of substation equipment through an external interface element (2), each phase of the isolation device (6) is connected with a corresponding phase of the test transformer (11) through a test bus (8), and the switching-on and switching-off states of the isolation device (6) and the connected grounding device (5) of each phase are respectively operated in a single phase.
5. The field insulation test device of the totally enclosed gas-insulated high-voltage switch according to claim 4, wherein three phases of SF 6/air bushings (9) are respectively connected between the test bus (8) and the test transformer (11), and each phase of SF 6/air bushing (9) is respectively connected with a corresponding phase of the grounding device (5) matched with the phase;
the transformer substation equipment is respectively connected with three-phase cable accessories, and each phase of cable accessory is respectively connected with a corresponding phase of a grounding device (5) matched with the phase;
each grounding device (5) is respectively connected between the high-voltage side of the corresponding phase of the substation equipment and the corresponding port of the gas-insulated high-voltage switch (1) connected with the high-voltage side.
6. The field insulation test device for the totally enclosed gas-insulated high-voltage switch according to claim 2, wherein only one phase of SF 6/air bushing (9) is connected between the test bus (8) and the test transformer (11), the SF 6/air bushing (9) is simultaneously connected with the isolation devices (6) respectively matched with each phase through the test bus (8), and the grounding device (5) corresponding to each isolation device (6) is respectively connected with the corresponding phase on the high-voltage side in the transformer substation equipment through the external interface element (2).
7. The field insulation test device of the totally enclosed gas-insulated high-voltage switch according to claim 2, wherein, in operation, the isolation device (6) is in a switching-off state, and the high-voltage switch grounding device (5) is in a switching-off state;
when in field insulation test of the gas-insulated high-voltage switch, the isolation device (6) is in a closing state, and the high-voltage switch grounding device (5) is in a breaking state;
during single-phase test, the grounding device (5) and the high-voltage switch grounding device (5) corresponding to the non-test phase are both in a closing state at the same time.
8. The field insulation test device of the totally enclosed gas-insulated high-voltage switch according to claim 1, wherein the grounding device (5) is sealed by a grounding device shell, a second internal transmission member (51) and a grounding moving contact (52) are arranged in the grounding device shell, the bottom of the grounding device shell is connected with an internal conductive shell (55), and an external interface element (2) and an internal conductor (54) electrically connected with the isolation device (6) are arranged in the internal conductive shell (55);
the inner conductor (54) is provided with a grounding static contact (53);
the top of the grounding device shell is provided with a second internal transmission part (51), the lower side of the second internal transmission part (51) is connected with a grounding moving contact (52), and the grounding moving contact (52) is driven by the second internal transmission part (51) to slide downwards to be in electrical contact with a grounding fixed contact (53), or is driven by the second internal transmission part (51) to slide upwards to be separated from electrical contact with the grounding fixed contact (53).
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| CN202111170299.1A CN113777456B (en) | 2021-10-08 | 2021-10-08 | Full-closed gas-insulated high-voltage switch field insulation test device |
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| CN202111170299.1A CN113777456B (en) | 2021-10-08 | 2021-10-08 | Full-closed gas-insulated high-voltage switch field insulation test device |
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| CN113777456B true CN113777456B (en) | 2023-07-04 |
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| CN116593845B (en) * | 2023-07-06 | 2023-12-05 | 江苏安靠智能输电工程科技股份有限公司 | Transformer and GIS equipment test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2936946B2 (en) * | 1993-03-12 | 1999-08-23 | 三菱電機株式会社 | Insulation test equipment |
| JP2001177932A (en) * | 1999-12-17 | 2001-06-29 | Mitsubishi Electric Corp | Gas-insulation switching device and withstand voltage testing method therefor |
| CN101521360A (en) * | 2009-02-18 | 2009-09-02 | 江苏精科互感器股份有限公司 | Insulation mode for metal closed combined electrical appliance |
| CN201886882U (en) * | 2010-11-25 | 2011-06-29 | 中国西电电气股份有限公司 | Outlet structure of SF6 insulation test transformer |
| CN102074906B (en) * | 2010-12-13 | 2012-11-28 | 上海安越电气工程技术有限公司 | Transformer neutral point combination electric equipment |
| CN202404212U (en) * | 2012-01-09 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Complete set of gas insulated switchgear (GIS) test section device for electric power |
| CN203287475U (en) * | 2013-05-06 | 2013-11-13 | 特变电工（上海）中发依帕超高压电器有限公司 | Transition device for 252 kV enclosed electric appliance and power-frequency test transformer |
| CN204118468U (en) * | 2014-11-12 | 2015-01-21 | 青岛特锐德电气股份有限公司 | Open combined electri cappliance and transformer station |
| CN104865505B (en) * | 2015-04-30 | 2018-03-06 | 广州白云电器设备股份有限公司 | A kind of industrial frequency withstand voltage experimental rig for three-phase combined type type high pressure GIS |
| CN205139311U (en) * | 2015-11-27 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | SF6 high -Voltage electrical appliances are with insulating pull rod insulation test device |
| CN106374380B9 (en) * | 2016-11-17 | 2023-09-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Uninterrupted power extension function module and extension method for GIS bus standby interval |
| CN112731210B (en) * | 2020-12-09 | 2021-12-17 | 江苏核电有限公司 | Main transformer electrical preventive test method without dismantling high-voltage side GIS |
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