CN113777456A - On-spot insulation test device of totally enclosed gas insulation high voltage switch - Google Patents
On-spot insulation test device of totally enclosed gas insulation high voltage switch Download PDFInfo
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- CN113777456A CN113777456A CN202111170299.1A CN202111170299A CN113777456A CN 113777456 A CN113777456 A CN 113777456A CN 202111170299 A CN202111170299 A CN 202111170299A CN 113777456 A CN113777456 A CN 113777456A
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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 insulation high voltage switch on-spot insulation test device. This application is at the internal connection conductor suitable position access test bus between gas insulated high voltage switch body and interface element, sets up isolating device and earthing device in the gas insulated cavity that test bus sleeve pipe formed. In the working state, the isolating device is in a switching-off state, and the grounding device is in a switching-on state; when the field insulation test is carried out, the isolation device can be directly set to be in a closing state, and the grounding device can be directly set to be in an opening state; when a single-phase test is carried out, the switching grounding device and the transformer side grounding device corresponding to the non-test phase are in a closing state at the same time. Therefore, the insulation test can be directly carried out after the external test transformer is connected, the test bus does not need to be disassembled and assembled respectively, the insulation test can be rapidly completed, and the power supply of the transformer substation is rapidly recovered after the test.
Description
Technical Field
The application relates to an insulation test system, in particular to a field insulation test device of a totally-enclosed gas-insulated high-voltage switch.
Background
For a totally enclosed gas-insulated high-voltage switch, all high-voltage components should be placed in a gas-insulated medium, and the outside of the insulated medium should be grounded, usually, the gas-insulated medium is covered by a grounded metal casing.
In a transformer substation construction area, when the totally enclosed gas insulated high voltage switch is butted with other equipment of a transformer substation, in order to ensure the safety of the totally enclosed gas insulated high voltage switch, an insulating medium is 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 an oil transformer, and the like, so that the gas insulated medium inside the high voltage switch is separated from other equipment.
The insulation test is required 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:
the method comprises the following steps: 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, a test bus is led in by electrically connecting the connecting conductor with the element of the gas insulated high-voltage switch, 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 injected again;
step two: when the insulation test is carried out, the SF 6/air sleeve is connected with an external test transformer through an overhead line, and high-voltage electricity generated by the external test transformer can be connected into the gas-insulated high-voltage switch.
Step three: after the test, the SF6 gas between the external interface element and the SF 6/air bushing needs to be extracted, the test bus, the connecting conductor and the SF 6/air bushing need to be removed, and finally the rated-pressure SF6 gas needs to be injected again.
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 respectively extracted and reinjected in the field insulation test, and connecting conductors are respectively installed. The existing experiment mode needs to execute a large amount of preparation work, sets insulation tests which are respectively carried out on three phases of the gas-insulated high-voltage switch, and carries out the steps on the three phases in sequence. Because each test needs the dismouting test bus, consequently be unfavorable for the transformer substation of the quick recovery power supply.
Disclosure of Invention
The utility model provides a to prior art's not enough, provides a totally enclosed gas insulated high voltage switch on-spot insulation test device, this application is at the internal connection conductor suitable position access test bus between gas insulated high voltage switch body and interface element, sets up isolating device in test bus, sets up earthing device between isolating device and interface element to be connected to SF6 air sleeve with the end of test bus. This application directly triggers corresponding equipment through optimizing circuit topological structure and switches working connection state according to experimental needs to link to each other through the overhead line with SF6 air jacket pipe and test transformer when experimental can conveniently carry out every insulating test in a flexible way, guarantee test efficiency and improve experimental security. The technical scheme is specifically adopted in the application.
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 simultaneously electrically connected with the gas insulated high-voltage switch and the external interface element, and the other end of the test bus is connected with the test transformer; the isolation 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 switching-on state, and the gas-insulated high-voltage switch is prevented from being electrically connected with the test transformer in a switching-off state; and the grounding device is installed in the test bus, is arranged between the isolating device and the external interface element, and triggers the gas-insulated high-voltage switch to be grounded during switching-on.
Optionally, the field insulation test device for the totally-enclosed gas-insulated high-voltage switch is as described above, wherein the gas-insulated high-voltage switch is hermetically connected with the external interface element by a bushing, an internal connection conductor is arranged in the bushing, one end of the grounding device is connected to the internal connection conductor, and the other end of the grounding device is connected to the isolating device.
Optionally, the field insulation test device for the totally enclosed gas insulated high voltage switch is as described in any one of the above, wherein the external interface element is a cable accessory.
Optionally, the field insulation test device for the totally-enclosed gas-insulated high-voltage switch as described in any one of the above paragraphs, wherein each phase of the grounding device is connected to a corresponding phase of the substation equipment through an external interface element, each phase of the isolating device is connected to a corresponding phase of the test transformer through a test bus, and the switching-on and switching-off states of the grounding device and the isolating device connected to each phase are respectively operated separately in a single phase.
Optionally, the field insulation test device for the totally-enclosed gas-insulated high-voltage switch as described in any one of the above paragraphs, 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 to a corresponding phase of the grounding device matching 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 is as described above, wherein only one phase of SF 6/air bushing is connected between the test bus and the test transformer, the SF 6/air bushing is simultaneously connected to the isolation devices respectively matched with the phases through the test bus, and the grounding devices corresponding to the isolation devices are respectively connected to the corresponding phase on the high-voltage side of the substation equipment through the external interface element.
Optionally, the field insulation test device for the totally-enclosed gas-insulated high-voltage switch is used, wherein during operation, the isolating device is in a switching-off state, and the grounding device on the side of the high-voltage switch is in a switching-off state; during a field insulation test of the gas insulation high-voltage switch, the isolating device is in a closing state, and the grounding device on the side of the high-voltage switch is in an opening state; during single-phase test, the grounding device and the high-voltage switch side 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 the totally enclosed gas insulated high voltage switch as described in any one of the above, wherein the isolating device includes: the moving contact is connected with a conductor, the first end of the moving contact is electrically connected with the SF 6/air sleeve through a test bus, and a hollow guide supporting groove is arranged in the moving contact; the isolating device static contact is electrically connected with the high-voltage side of the substation equipment through an external interface element, is arranged on the outer side of the second end of the moving contact connecting conductor and is opposite to the open end of the hollow guide supporting groove; the moving contact of the isolating device is electrically connected with the moving contact connecting conductor and is arranged in the hollow guide supporting groove in a sliding manner; in a switching-on state, the moving contact of the isolating device slides to the second end of the moving contact connecting conductor along the hollow guide supporting groove and is electrically contacted with the fixed contact of the isolating device; and under the switching-off state, the moving contact of the isolating device is arranged in the hollow guide supporting groove and is separated from the electric contact with the fixed contact of the isolating device.
Optionally, the field insulation test device for the totally-enclosed gas-insulated high-voltage switch as described above, wherein the isolation device is sealed by an isolation device housing, two ends of the isolation device housing are respectively connected to the fixed contact of the isolation device and the moving contact connecting conductor, and the moving contact connecting conductor extends from one side end of the isolation device housing to the opposite side position close to the fixed contact of the isolation device; the isolation device further comprises: the internal transmission part is arranged at the top of the moving contact connecting conductor and is meshed with the moving contact of the isolating device; the bottom end of the insulating transmission rod is connected with the internal transmission part and synchronously rotates with the internal transmission part; the sealing coupler is arranged at the top of the isolating device and 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 the sealing coupler drives the insulating transmission rod to drive the internal transmission piece to enable the movable contact connecting conductor to slide along the empty guide supporting groove.
Optionally, the field insulation test device for the totally enclosed gas insulated high-voltage switch as described above, wherein the grounding device is sealed by a grounding device housing, an internal transmission member and a grounding moving contact are arranged in the grounding device housing, the bottom of the grounding device housing is connected with an internal conductive housing, and an external interface element and an internal conductor electrically connected to the isolation device are arranged in the internal conductive housing; a grounding static contact is arranged on the inner conductor; the grounding device comprises a grounding device shell, and is characterized in that an internal transmission part is arranged at the top of the grounding device shell, a grounding moving contact is connected to the lower side of the internal transmission part, and the grounding moving contact is driven by the internal transmission part to slide downwards to be in electrical contact with a grounding fixed contact or driven by the internal transmission part to slide upwards to be separated from the electrical contact with the grounding fixed contact.
Advantageous effects
This application inserts experimental generating line in the internal connection conductor suitable position between gas insulated high voltage switch body and the interface element, utilizes the gas insulation cavity that experimental generating line sleeve pipe formed to provide reliable insulating isolation to set up isolating device and earthing device in the gas insulation cavity. According to the power supply device, the isolation device can be set to be in an opening state and the grounding device is in a closing state in a working state so as to provide stable power supply output; when the field insulation test is carried out, the isolating device is directly set to be in a closing state, and the grounding device is directly set to be in an opening state; when a single-phase test is carried out, the switching grounding device and the transformer side grounding device corresponding to the non-test phase are in a closing state at the same time. Therefore, the insulation test can be directly carried out after the external test transformer is connected, the test buses do not need to be disassembled and assembled respectively, the insulation test can be rapidly completed, and the power supply of the transformer substation can be rapidly recovered by rapidly switching the switch state after the test is finished.
In addition, because the switching of circuit on-off state is realized directly through the switch structure in the gas insulation cavity to this application from connecting device, consequently, this application can be followed the outside and directly through trigger switch's driving medium, and drive switch structure internal contact switches its on-off state to control the electrical connection state between every looks external interface component and the test transformer, in order to make things convenient for carry out every looks insulation test in a flexible way. In this application, the switching of each looks circuit on-off state need not manual operation electrical connection pipeline and can realize, consequently, the straight connecting 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 the 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 embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:
fig. 1 is a schematic view of a field insulation test device of a totally enclosed gas insulated high voltage switch of the present application;
FIG. 2 is a circuit schematic of the apparatus of the present application in a first implementation;
FIG. 3 is a circuit schematic of the apparatus of the present application in a second implementation;
FIG. 4 is a schematic view of the internal structure of the isolation device employed in the apparatus of the present application;
FIG. 5 is a schematic view of the internal structure of the grounding device employed in the apparatus of the present application;
in the drawings, 1 denotes a gas insulated high voltage switch; 2 denotes an external interface element; 3 denotes a cable; 4 denotes a connection conductor; 5 denotes a grounding device; 6 denotes an isolation device; 8 denotes a test busbar; 9 denotes SF 6/air bushing; 10 denotes an overhead line; 11 denotes a test transformer; 51 denotes an internal transmission; 52 denotes a grounding moving contact; 53 denotes a grounded stationary contact; 54 denotes an inner conductor; 55 denotes an inner lead casing; 56 denotes a grounding device insulation chamber; 60 denotes a basin insulator; 61 denotes the isolator stationary contact; 62 denotes a sealing coupling; 63 denotes an insulating transmission rod; 64 denotes an internal transmission; 66 denotes the moving contact of the isolating device; 67 represents a moving contact connecting conductor; 68 denotes a spacer housing; and 69, an isolator insulation chamber.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application clearer, 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 should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
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 used herein is intended to include both the individual components or both.
The meaning of "inside and outside" in this application means that the direction from the transmission element of the isolating or grounding device itself towards the contacts inside the housing is inside and vice versa; and not as a specific limitation on the mechanism of the device of the present application.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
The term "up and down" as used herein means that the direction from the transmission member to the contact inside the housing is down, or vice versa, when the user is facing the isolation device or the grounding device, and is not a specific limitation on the mechanism of the device 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 field insulation test of the totally enclosed gas insulated high voltage switch. The application discloses on-spot insulation test device of totally enclosed gas insulation high voltage switch includes:
a test bus 8, one end of which is electrically connected with the gas insulated high-voltage switch 1 and the external interface element 2 at the same time, and the other end of which is connected with a test transformer 11; the gas insulated high-voltage switch 1 is hermetically connected with the external interface element 2 through a sleeve, and an internal connecting conductor 4 is arranged in the sleeve
The isolation device 6 is installed in a 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 switching-on state, and the gas insulated high-voltage switch 1 is prevented from being electrically connected with the test transformer 11 in a switching-off state;
and the grounding device 5 is installed in the test bus, is arranged between the isolation device 6 and the external interface element 2, connects one end of the grounding device 5 with the internal connecting conductor 4, and connects the other end of the grounding device 5 with the isolation device 6 so as to enable the trigger gas insulated high-voltage switch 1 to be grounded during closing.
Therefore, the circuit structure shown in fig. 2 or fig. 3 can be formed by the isolating 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 cable accessories, one end of the test bus sleeve is arranged in the SF6 air chamber through the external interface element 2 connected with the cable, and is electrically communicated with the gas-insulated high-voltage switch through the external interface element 2, so that the on-off state of the circuit is rapidly switched through the switch structure arranged in the SF6 air chamber. From this, this application only need with the access of outside test transformer can carry out insulation test through switching each switch on-off state, need insert test bus, need demolish the trouble of test bus after the experiment before avoiding under the current mode. This application can accomplish insulation test fast and resume the electric device spare normal operating that external interface component links through the switching to isolating device 6, earthing device 5 break-make state.
In the specific setting, referring to fig. 2, each phase of the grounding device 5 in the totally enclosed gas insulated high-voltage switch field insulation test device is connected with the corresponding phase of the external interface element 2, each phase of the isolation device 6 in the high-voltage switch field insulation test device is connected with the corresponding phase of the test transformer 11 through the test bus 8, and the opening and closing states of the grounding device and the isolation device connected with each phase 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 through the switch from the outside, so that each phase of insulation test can be conveniently and flexibly carried out, and the safety performance is higher.
In cooperation with the wiring structure of the single-phase independently operated high-voltage switch field insulation test device, in the implementation manner shown in fig. 2, a three-phase SF 6/air bushing 9 can be further arranged between the test bus 8 and the test transformer 11, and the three-phase SF 6/air bushing 9 is respectively connected with a test device isolation device matched with the phase; similarly, each phase of external interface element 2 is respectively connected with the corresponding phase of the grounding device matched with the phase; while the grounding device of the test apparatus for each phase is electrically connected to the external interface element 2 to which the cable matching that phase is connected. Therefore, 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 respectively correspond to each phase SF 6/air sleeve 9 in a single-phase mode, three-phase independent test is achieved through single-phase separated operation of the isolating device and the grounding device, and mutual noninterference among the phases in the test process is guaranteed.
The test bus in the three-phase independent mode can select three phases and is provided with a three-phase SF 6/air sleeve. The electrical schematic diagram can be referred to fig. 2.
In other implementations, three phases may be electrically connected by combining three phases into one phase, configuring a one-phase SF 6/air bushing, and using the electrical schematic shown in fig. 3. In this way, a three-phase common-box structure can be adopted to arrange the three-phase conductive structures in the same shell, and a three-phase box separating structure can be arranged to respectively seal the three-phase conductive structures in the respective shells.
When three phases are combined and controlled, the cable 3 externally connected with the equipment can be connected to the same group of test devices containing three phases through the external interface element 2, and the test bus of the test device is connected with the SF 6/air sleeve of the test transformer 11. In order to further simplify the internal circuit structure of each test device, in this way, 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 connected to and matched with a plurality of isolation devices of each phase through the test bus at the same time, the grounding device 5 corresponding to each isolation device 6 is connected to the corresponding phase of the cable through an oil/SF 6 bushing, and the grounding device in each test device is electrically connected with the external interface element 2 and the corresponding port of the gas insulated high voltage switch 1 at the same time, as shown in fig. 3.
Thus, the above implementation may combine the end SF 6/air bushings of each connection device into one set, simplifying the connection lines between the phases, and at the same time achieving the insulation test function.
No matter the test device adopts a three-phase common-box mechanism or a three-phase box-separating mechanism, the isolating device 6 can be constructed in a mode shown in fig. 4, so that the on-off state of the connecting conductor 4 for connecting each power device in the test bus is switched and controlled. The separator 6 is sealed by a separator case 68, and an insulating gas such as SF6 is filled in a separator insulating chamber 69 formed inside the separator case 68. The two ends of the isolation device housing 68 are respectively provided with the isolation device fixed contact 61 and the test transformer connecting conductor 671 through the basin-shaped insulator 60. Wherein the outer side of the test transformer connection conductor 671 is connected to the test transformer 11 via the test bus bar 8, the SF 6/air bushing 9 and the overhead line 10. The inner side of the test transformer connection conductor 671 is connected with the isolating device moving contact 66 through a moving contact connection conductor 67. The center conductor of the basin-type insulator 60 connected with the moving contact connecting conductor 67 is electrically connected with the test transformer, the first end of the moving contact connecting conductor 67 is electrically connected with the SF 6/air bushing 9 through the test bus bar 8, and the other end of the moving contact connecting conductor extends inwards to form a hollow guide supporting groove for accommodating the moving contact 66 of the isolating device. The open end of the hollow guide support groove faces 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 power device connected with the cable through the central conductor of the side basin insulator 60, is arranged outside the movable contact connecting conductor 67, and is horizontally aligned with the opening end of the hollow guide supporting groove.
Therefore, the moving contact connecting conductor 67 extends from one end of the isolating device shell 68 to be close to the isolating device fixed contact 61, and the isolating device moving contact 66 is electrically connected with the moving contact connecting conductor 67 through sliding connection between the moving contact connecting conductor and the hollow guiding supporting groove in the isolating device. The moving contact 66 of the isolation 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 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 isolation device can be switched. An insulating transmission rod 63, the bottom end of which is fixedly connected with the internal transmission member 64 or meshed with the internal transmission member, and rotates synchronously with the internal transmission member 64; the sealing coupling 62 can be arranged on the top of the isolation device 6 and fixedly connected with the top end of the insulating transmission rod 63 or meshed with the top end of the insulating transmission rod for synchronous transmission. Therefore, the operating mechanism arranged outside the top end of the isolating device shell 68 can be an operating handle or a power mechanism, which is butted with and drives the insulating transmission rod 63 through the sealing coupler 62, and the insulating transmission rod drives the internal transmission member 64 to make the isolating device moving contact 66 slide to one side along the hollow guiding support groove, so that the isolating device moving contact 66 slides to one end along the hollow guiding support groove and is electrically contacted with the isolating device static contact 61, and the isolating device 6 is placed in a closing state; or the moving contact connecting conductor 67 slides to the other side along the hollow guide supporting groove, so that the moving contact 66 of the isolating device slides to the other end along the hollow guide supporting groove, is separated from the electrical contact with the static contact 61 of the isolating device, and the isolating device 6 is placed in a brake-off state.
Therefore, the isolating device 6 can be set in a closing state, the grounding device 5 and the transformer side grounding device 7 are simultaneously in an opening state, the equipment connected with the cable and the gas insulated high-voltage switch 1 are conducted, and the power device is set to normally work in a working state. The isolation device 6 can be arranged in a closing state, the testing transformer 11 of the electric device and the testing end is conducted, the electric device is arranged in a field insulation testing state, and at the moment, the grounding device 5 is correspondingly arranged in a switching-off state, so that the insulation test of the electric device can be realized. During single-phase test, the grounding device 5 and the grounding device corresponding to the non-test phase are both in a closing state at the same time, so that the grounding protection of the test circuit can be realized, and the interference of the grounding protection to other phase circuits is avoided for carrying out test.
Considering that the grounding device 5 includes two states of closing grounding and opening operation, it can be realized by the switch structure shown in fig. 5. In fig. 5, the switch structure is sealed by an inner lead case 55 and a ground device case, and an insulating gas such as SF6 is filled in a ground device insulating chamber 56 formed inside the inner lead case 55. Both ends of the inner conductor housing 55 are electrically connected to the gas insulated high voltage switch and the isolating device 6 via a basin insulator 60, respectively. The top of the inner conductive housing 55 is hermetically provided with the ground moving contact 52 and the inner transmission member 51 through the switch housing. The grounding movable contact 52 can be implemented by a grounding metal rod, and the lower end of the grounding movable contact can extend downwards from the bottom of the grounding device housing into the inner conductive housing 55 to be electrically connected with the grounding fixed contact 53 arranged on the inner conductor 54. The internal transmission member 51 is disposed at the top of the grounding device housing, and the operating mechanism may be a handle or a power mechanism for 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 base through the internal transmission member 51 in a manual or electric mode, so that the lower side of the operating mechanism is connected with the top of the grounding moving contact 52, and the operating mechanism is driven by the internal transmission member 51 to slide down to be in electrical contact with the grounding fixed contact 53, thereby realizing the single-phase grounding of the electric power device connected with the external interface element 2 and the oil/SF 6 outgoing line bushing, so that other phases can carry out a high-voltage insulation test, or is driven by the internal transmission member 52 to slide up to be separated from being in electrical contact with the grounding fixed contact 53.
In other implementations, the inner conductive shell 55 of the grounding device 5 and the isolation device shell 68 of the isolation device 6 can be connected to the bushing of the test bus 8 as a whole. If the test device comprises a three-phase SF 6/air sleeve and adopts a three-phase common box structure, the other two-phase isolating device and the grounding device which are not tested are switched on during a single-phase test. After the test is finished, the SF 6/air bushing can be grounded, and the isolation device and the grounding device are separated.
In conclusion, the test bus is connected to the proper position of the internal connection conductor between the oil/SF 6 outgoing line sleeve and the gas insulation high-voltage switch, the isolation device is arranged in the test bus, the grounding device is arranged between the isolation device and the oil/SF 6 outgoing line sleeve, and the tail end of the test bus is connected with the SF 6/air sleeve, so that the SF 6/air sleeve is connected with the test transformer through the overhead line during testing, switching of the on-off state of the electric connection line of the corresponding test bus can be achieved through the isolation device and the grounding device, switching of the on-off connection state of the test circuit is correspondingly achieved according to testing needs, and the trouble of original dismounting and mounting of the connection sleeve and the electric conduction line is saved. The isolating device and the grounding device can be operated separately in a single phase, and are matched with a three-phase test bus and a three-phase SF 6/air sleeve to ensure that the phases are not interfered with each other. In the application, three phases can be combined into one phase, a one-phase SF 6/air sleeve is configured, and the same switching function of the on-off state of the circuit can be realized by adopting a three-phase common-box structure with three phases in the same shell or a three-phase split-box structure with three phases in respective shells by utilizing the electrical schematic diagram shown in FIG. 3.
Compared with the prior art, the application has the following obvious advantages:
the test device can be connected with a test bus between a gas insulated high-voltage switch and a power device, and an isolating device and a grounding device which are independently operated, an SF 6/air sleeve and other units are arranged in the test bus so as to directly realize line switching by switching on or off by driving the grounding device 5 and the isolating device 6, meet the requirements of field insulation tests of all phases, reduce the workload of field tests and improve the working efficiency;
2, the testing device of this application, the separating brake and the combined floodgate of accessible outside operating mechanism control isolating device and earthing device can realize between a plurality of power devices, or the test object conversion between each looks of same device, and the security performance is higher.
The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.
Claims (10)
1. The utility model provides a totally enclosed gas insulation high voltage switch field insulation test device which characterized in that includes:
a test bus (8), one end of which is electrically connected with the gas insulated high-voltage switch (1) and the external interface element (2) at the same time, and the other end of which is connected with a test transformer (11);
the isolation device (6) is installed in a 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 switching-on state, and the gas-insulated high-voltage switch (1) is prevented from being electrically connected with the test transformer (11) in a switching-off state;
and the grounding device (5) is installed in the test bus, is arranged between the isolating device (6) and the external interface element (2), and triggers the gas-insulated high-voltage switch (1) to be grounded during closing.
2. The insulation test device for the field of the totally enclosed gas insulated high voltage switch according to claim 1, wherein the gas insulated high voltage switch (1) is hermetically connected with the external interface element (2) by a bushing, an internal connecting conductor (4) is arranged in the bushing, 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 field insulation test device of a totally enclosed gas insulated high voltage switch according to claim 2, characterized in that the external interface element (2) is a cable accessory.
4. The insulation test device for the field of the totally enclosed gas insulated high voltage switch according to claim 2, characterized in that each phase of the grounding device (5) is connected with a corresponding phase of the substation equipment through the external interface element (2), each phase of the isolating device (6) is connected with a corresponding phase of the test transformer (11) through the test bus (8), and the opening and closing states of the grounding device (5) and the isolating device (6) connected with each phase are respectively operated separately in a single phase.
5. The field insulation test device of the totally enclosed gas insulated high voltage switch according to claim 4, characterized in that three phases SF 6/air bushing (9) are connected between the test bus (8) and the test transformer (11), and each phase SF 6/air bushing (9) is connected to the corresponding phase of the grounding device (5) matching 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 (5) matched with the phase;
each grounding device (5) 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 (1) connected with the high-voltage side.
6. The field insulation test device of the totally enclosed gas insulated high voltage switch according to claim 2, characterized in that 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 through the test bus (8) to the isolation devices (6) respectively matched to each phase, and the grounding device (5) corresponding to each isolation device (6) is connected through the external interface element (2) to the corresponding phase on the high voltage side of the substation equipment.
7. The field insulation test device of the totally enclosed gas insulated high voltage switch according to claim 2, characterized in that, during operation, the isolation device (6) is in the open state, and the high voltage switch side grounding device (5) is in the open state;
during a field insulation test of the gas insulation high-voltage switch, the isolating device (6) is in a closing state, and the high-voltage switch side grounding device (5) is in an opening state;
during single-phase test, the grounding device (5) and the high-voltage switch side 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 a totally enclosed gas insulated high voltage switch according to claim 1, characterized in that the isolation device (6) comprises:
the moving contact is connected with a conductor (67), the first end of the moving contact is electrically connected with an SF 6/air sleeve (9) through a test bus (8), and a hollow guide supporting groove is arranged in the moving contact;
the isolating device static contact (61) is electrically connected with the high-voltage side of the substation equipment through an external interface element (2), is arranged on the outer side of the second end of the moving contact connecting conductor (67), and is opposite to the open end of the hollow guide supporting groove;
the moving contact (66) of the isolating device is electrically connected with a moving contact connecting conductor (67) and is arranged in the hollow guide supporting groove in a sliding way;
in a closing state, the moving contact (66) of the isolating device slides to the second end of the moving contact connecting conductor (67) along the hollow guide supporting groove and is electrically contacted with the fixed contact (66) of the isolating device;
and under the switching-off state, the moving contact (66) of the isolating device is arranged in the hollow guide supporting groove and is separated from the electric contact with the fixed contact (61) of the isolating device.
9. The field insulation test device of the totally enclosed gas insulated high voltage switch according to claim 8, wherein the isolation device (6) is sealed by an isolation device housing (68), two ends of the isolation device housing (68) are respectively connected with the fixed contact (61) and the movable contact connecting conductor (67), and the movable contact connecting conductor (67) extends from one side end of the isolation device housing (68) to an opposite side position close to the fixed contact (61);
the isolation device (6) further comprises:
an internal transmission member (64) arranged on top of the moving contact connecting conductor (67) and engaged with the moving contact (66) of the isolating device;
the bottom end of the insulating transmission rod (63) is connected with the internal transmission piece (64) and synchronously rotates with the internal transmission piece (64);
the sealing coupling (62) is arranged at the top of the isolating device (6) and is connected with the top end of the insulating transmission rod (63);
the operating mechanism is arranged outside the top end of the isolating device shell (68), and the sealing coupler (62) drives the insulating transmission rod (63) to drive the internal transmission piece (64) to enable the movable contact connecting conductor (67) to slide along the empty guide supporting groove.
10. The field insulation test device of the totally enclosed gas insulated high voltage switch according to claim 1, characterized in that the grounding device (5) is sealed by a grounding device shell, an 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 inner conductive shell (55), and an internal conductor (54) electrically connected with the external interface element (2) and the isolating device (6) is arranged in the inner conductive shell (55);
a grounding static contact (53) is arranged on the inner conductor (54);
the top of the grounding device shell is provided with an internal transmission member (51), the lower side of the internal transmission member (51) is connected with a grounding moving contact (52), and the grounding moving contact (52) is driven by the internal transmission member (51) to slide downwards to be in electrical contact with a grounding static contact (53) or driven by the internal transmission member (52) to slide upwards to be separated from the electrical contact with the grounding static 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 CN113777456B (en) | 2023-07-04 |
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Cited By (1)
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| CN113777456B (en) | 2023-07-04 |
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