CN116544046B - Gas-insulated neutral point grounding switch of transformer - Google Patents
Gas-insulated neutral point grounding switch of transformer Download PDFInfo
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- CN116544046B CN116544046B CN202310814871.6A CN202310814871A CN116544046B CN 116544046 B CN116544046 B CN 116544046B CN 202310814871 A CN202310814871 A CN 202310814871A CN 116544046 B CN116544046 B CN 116544046B
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 61
- 239000004020 conductor Substances 0.000 claims abstract description 55
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000012806 monitoring device Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 62
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 12
- 238000009413 insulation Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
- H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The application relates to the technical field of transformer equipment, in particular to a transformer gas-insulated neutral point grounding switch, which comprises a conductor, a base, a shell, a crank arm structure and a grounding structure, wherein the base is arranged at the top of the shell, the conductor passes through the middle of the base and is connected with the crank arm structure, the other surface of the base is connected with the grounding mechanism, and the crank arm structure is also connected with a current detection device and a displacement monitoring device. The current detection device and the displacement monitoring device are connected to the crank arm structure, whether current flows through the crank arm shaft or not is detected, and the change of surrounding magnetic fields is utilized when the crank arm shaft is electrified, and the change of the oscillating frequency and the coil impedance is caused by the change of the magnetic fields, so that the distance between the crank arm shaft and the conductor can be judged through the change of the coil inductance, and further whether the crank arm shaft and the conductor are completely separated or not can be judged, the judgment of whether the neutral point grounding switch is in place or not is facilitated, and the safety of equipment and workers is ensured.
Description
Technical Field
The application relates to the technical field of transformer equipment, in particular to a gas-insulated neutral point grounding switch of a transformer.
Background
The neutral point grounding device of the existing outdoor high-voltage transformer substation is required to be provided with a stand column beside a transformer, so that the neutral point complete device is installed on the stand column, then the neutral point complete device is connected to a neutral point sleeve of the transformer through an overhead flexible wire, and in the engineering construction process, stand column foundation manufacturing and related foundation screw embedding are required.
In addition, the overhead connection flexible wires between the neutral point complete equipment and the transformer are completely exposed in the air, so that the requirement on the insulation distance is high, and the electric discharge phenomenon is easily generated under the influence of environmental factors in certain severe rainy and snowstorm weather. Therefore, a gas-insulated neutral grounding device is needed, the neutral grounding switch is used as a component in the neutral grounding device, the rotating state of a crank arm shaft in the neutral grounding switch is generally utilized to judge the switching state of the neutral grounding switch, the neutral grounding switch can be used for grounding normally when being switched on, and when the neutral grounding switch is switched off, a power supply line can be isolated from a grounding body or the ground, and the transformer and the inside of a circuit breaker can be overhauled.
In the existing neutral point grounding switch, a worker only judges the rotating state of an internal connecting lever shaft of the transformer through an opening and closing indication board outside the transformer so as to judge whether the grounding switch is opened or closed, and can not judge whether the contact movement and rotation of the connecting lever shaft are completely in place, if the connecting lever shaft is damaged or loosened, the opening and closing indication board outside the transformer can not completely display the state of the connecting lever shaft, the situation that the opening and closing of the neutral point grounding switch are not in place can occur at the moment, and if the worker operates the neutral point grounding switch at the moment, the danger of electric shock is easy to cause, so that safety accidents are caused.
Disclosure of Invention
The application aims to solve the defects in the prior art, and provides a transformer gas-insulated neutral point grounding switch.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the transformer gas-insulated neutral point grounding switch comprises a conductor, a base, a shell, a crank arm structure and a grounding structure, wherein the base is arranged at the top of the shell, the conductor passes through the middle of the base and is connected with the crank arm structure, the other surface of the base is connected with the grounding mechanism, and the crank arm structure is also connected with a current detection device and a displacement monitoring device;
the current detection device comprises an input current Li, wherein the output end of the input current Li is respectively connected with an operational amplifier U1 and an operational amplifier U2, the positive electrode of the operational amplifier U1 is connected with a capacitor C1, the output end of the capacitor C1 is grounded, the negative electrode of the operational amplifier U1 is connected with a grounding end GND, the output end of the operational amplifier U1 is connected with a resistor R4, the output end of the resistor R4 is connected with a resistor R6, the output end of the resistor R6 is connected with a resistor R7, the output end of the resistor R7 is connected with a resistor R8, the output end of the resistor R8 is connected with a buzzer HA, the output end of the buzzer HA is connected with a diode D1, the output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U1, the output end of the resistor R1 is also connected with a resistor R2, the output end of the resistor R2 is connected with the inverting input end of the operational amplifier U2, the output end of the resistor R2 is connected with the grounding end of the resistor U2, and the output end of the resistor C2 is connected with the grounding end of the resistor U2;
the output end of the operational amplifier U2 is also connected with a resistor R5, the output end of the resistor R5 is connected with a resistor R9, the output end of the resistor R5 is also connected with an operational amplifier U3, the in-phase input end of the operational amplifier U3 is connected to the output end of a resistor R4, the positive electrode of the operational amplifier U3 is connected with a capacitor C3, the negative electrode of the capacitor C3 is grounded, the negative electrode of the operational amplifier U3 is connected with a ground end GND, the output end of the operational amplifier U3 is connected to the resistor R9, the output end of the operational amplifier U3 is also connected with a resistor R10, the output end of the resistor R10 is connected with an adjustable resistor Rp, one end of the adjustable resistor Rp 11 is connected with a resistor R11, one end of the resistor R11 is connected with a capacitor C5, the capacitor C5 and the resistor R11 form a series circuit, the output end of the series circuit is grounded, the two ends of the capacitor C5 are connected with a current detection meter, one end of the adjustable resistor Rp is also connected with the negative electrode of the resistor U4 and the ground end of the resistor U4, the negative electrode is connected with the negative electrode of the resistor R4 is connected with the resistor R4, the negative electrode of the resistor U4 is connected with the output end of the resistor U4 is connected with the resistor C4, the negative electrode is connected with the diode 4, the output end of the resistor 4 is connected with the diode 3 is connected with the resistor D12, and the output end of the diode is connected with the resistor C4.
The displacement monitoring device comprises an input voltage Ui, one end of the input voltage Ui is connected to a crank arm structure, one end of the input voltage Ui is connected with a resistor R13 and a resistor R14, the resistor R13 is connected with the resistor R14 in series, one end of the resistor R13 and one end of the resistor R14 are also connected with a triode Q1, a collector of the triode Q1 is connected with a resistor R15, one end of the resistor R15 is connected to the resistor R13, an emitter of the triode Q1 is connected with a resistor R16, one end of the resistor R16 is connected to the resistor R14, an emitter of the triode Q1 is also connected with a capacitor C7, one end of the capacitor C7 is connected to the resistor R16, and the other end of the capacitor C7 is connected with a capacitor C6;
one end of the capacitor C6 is connected with an inductance coil L1, two ends of the inductance coil L1 are connected with an LCR meter, one end of the inductance coil L1 is connected with a capacitor C10, one end of the capacitor C10 is connected to the output end of the capacitor C7, the inductance coil L1 and the capacitor C10 form a series circuit, and two ends of the series circuit are connected with a capacitor C9 in parallel;
the one end of electric capacity C6 still is connected with electric capacity C8, electric capacity C8's one end is connected with resistance R17, electric capacity R17's one end is connected on resistance R15, electric capacity C8's one end still is connected with triode Q2, triode Q2's collecting electrode is connected on resistance R17, triode Q2's projecting pole is connected with resistance R18, resistance R18's negative pole ground connection, triode Q2's projecting pole still is connected with electric capacity C11, triode Q2's collecting electrode still is connected with electric capacity C12, electric capacity C12's negative pole ground connection, electric capacity C12's one end is connected with inductor L2, inductor L2's output is connected on electric capacity C11, inductor L2 and electric capacity C10's output is connected with output voltage Uo.
Preferably, the crank arm structure comprises a sliding block, a crank arm shaft, a first bearing and a second bearing, one end of the crank arm is connected with the sliding block through a pin shaft with holes, round holes are formed in the connecting ends of the crank arm and the sliding block, a round shaft capable of rotating freely is arranged in the round holes, two ends of the round shaft are limited and fixed through spring gaskets for shafts, a hexagonal through hole is formed in the other end of the crank arm, the hexagonal through hole is matched with the hexagonal nut head-type boss of the crank arm shaft, and the crank arm shaft is connected with the two ends of the shell through the first bearing and the second bearing.
Preferably, the grounding mechanism comprises an internal grounding copper bar, an insulating grounding seat and an external grounding copper bar, one end of the internal grounding copper bar is connected with the base, the other side of the internal grounding copper bar is connected with one end of the insulating grounding seat, the insulating grounding seat is arranged on the shell, the other side of the insulating grounding seat is connected with the external grounding copper bar, and the external grounding copper bar is grounded in the running process of the equipment.
Preferably, one end of the shell is connected with the base, the conductor penetrates through the base and is connected with the sliding block, an insulating sheath I is arranged between the base and the shell, an insulating cover plate is arranged on the base, a metal pressing plate is arranged on the insulating cover plate, a connecting bolt is arranged on the metal pressing plate, and an insulating backing plate and an insulating sheath II are arranged at the joint of the conductor and the sliding block and are insulated and separated.
Preferably, two raised dots are arranged on two surfaces of the insulating base plate, two concave dots are arranged on the connecting surfaces of the conductor and the sliding block, the two surface dots of the insulating base plate are embedded into the concave dots of the conductor and the sliding block to limit, an inner hexagon screw head is arranged on one surface of the insulating sheath II, and the inner hexagon screw head for installation is protected on the height of the insulating sheath II.
Preferably, a guide ring and a spring contact finger are arranged on the contact surface of the conductor and the base, and the conductor is electrically connected with the base through the spring contact finger.
Preferably, the flange is installed to casing lower part both sides, set gradually sealing washer I, sealing washer II and sealing washer III in the flange, pass bearing I, crank and bearing II in proper order when the crank axle is installed and use apron I and apron II to cover the flange of casing both sides after accomplishing the installation, set up the installation hand hole on the base, use apron I and apron II to cover and seal after finishing the installation of casing inner conductor.
Preferably, the conductor is driven to move back and forth by rotating the crank shaft to realize connection and disconnection of the conductor and the neutral point conductor, the crank structure is connected with a control module, the control module is connected with an electric mechanism, the electric mechanism is connected with a computer processor, and the computer processor, the electric mechanism and the control module realize on-site operation and remote control of the neutral point grounding switch.
The beneficial effects of the application are as follows:
the current detection device and the displacement monitoring device are connected to the crank arm structure, whether current flows through the crank arm shaft or not is detected, when the crank arm shaft is electrified, the magnetic field around the crank arm shaft is changed, the oscillating frequency is changed due to the change of the magnetic field, and then the coil impedance is changed due to the change of the oscillating frequency, so that the distance between the crank arm shaft and the conductor can be judged through the change of the coil inductance, and further whether the crank arm shaft and the conductor are completely separated or not is judged, and the judgment of whether the neutral point grounding switch is in place or not is facilitated, and the safety of equipment and staff is ensured.
The insulating cover plate is covered on the base, the base and the shell are fixed through embedding bolt holes, the metal pressing plate is pressed on the insulating cover plate, the connecting bolts are installed on the metal pressing plate, the metal pressing plate and the insulating cover plate can be fixed, the insulating base plate and the insulating cover plate are arranged at the joint of the conductor and the sliding block in the crank arm structure, and dots on two sides of the insulating base plate are embedded into the pits of the conductor and the sliding block to limit, so that good insulating tightness of the neutral point grounding switch is ensured, the neutral point grounding switch is reliable in grounding, small in external dimension and small in occupied area.
The forward and backward movement of the conductor can be controlled by controlling the rotation movement of the crank arm shaft, so that the neutral point grounding switch structure is simpler and more convenient, the opening and closing states of the grounding switch are realized, and the insertion connection or the extraction disconnection of the grounding switch and the inner conductor of the neutral point equipment is ensured.
Drawings
Fig. 1 is a schematic diagram of the general structure of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 2 is a schematic diagram of a cross-sectional structure of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 3 is a schematic diagram of a sectional structure of a gas-insulated neutral grounding switch of a transformer according to the present application;
fig. 4 is a schematic diagram illustrating a cross-sectional structure of a transformer gas-insulated neutral point grounding switch in a closed state according to the present application;
fig. 5 is a schematic diagram of a shell structure of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 6 is a schematic diagram of a crank arm structure of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 7 is a schematic diagram of a crank shaft structure of a transformer gas-insulated neutral grounding switch according to the present application;
fig. 8 is a schematic diagram of a mounting cross-sectional structure of a crank arm shaft of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 9 is a schematic diagram of an insulation separation structure of a transformer gas-insulated neutral-point grounding switch according to the present application;
fig. 10 is a schematic diagram of connection of an electric mechanism of a transformer gas-insulated neutral point grounding switch according to the present application;
FIG. 11 is a schematic diagram of a current detecting device of a transformer gas-insulated neutral point grounding switch according to the present application;
fig. 12 is a schematic diagram of a displacement monitoring device of a transformer gas-insulated neutral point grounding switch according to the present application.
In the figure:
1. a conductor; 2. a base; 3. an insulating sheath I; 4. grounding copper bars internally; 5. an insulating grounding seat; 6. externally connected with a grounding copper bar; 7. an insulating sheath II; 8. a sliding block; 9. a pin shaft with holes; 10. a crank arm; 11. a crank arm shaft; 12. a guide ring; 13. spring contact fingers; 14. a housing; 15. an insulating backing plate; 16. a circular shaft; 17. spring washers for shafts; 18. a cover plate I; 19. a first sealing ring; 20. a first bearing; 21. a second sealing ring; 22. a cover plate II; 23. a second bearing; 24. a third sealing ring; 25. an insulating cover plate; 26. a metal pressing plate; 27. and installing a hand hole.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments.
What is not described in detail in this specification is prior art known to those skilled in the art.
Standard parts used in the application can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the details are not described.
Embodiment one: referring to fig. 1-12, a transformer gas-insulated neutral point grounding switch comprises a conductor 1, a base 2, a shell 14, a crank arm structure and a grounding structure, wherein the base 2 is arranged at the top of the shell 14, the conductor 1 passes through the middle of the base 2 and is connected with the crank arm structure, the other surface of the base 2 is connected with the grounding mechanism, and the crank arm structure is also connected with a current detection device and a displacement monitoring device;
the current detection device comprises an input current Li, wherein the output end of the input current Li is respectively connected with an operational amplifier U1 and an operational amplifier U2, the positive electrode of the operational amplifier U1 is connected with a capacitor C1, the output end of the capacitor C1 is grounded, the negative electrode of the operational amplifier U1 is connected with a grounding end GND, the output end of the operational amplifier U1 is connected with a resistor R4, the output end of the resistor R4 is connected with a resistor R6, the output end of the resistor R6 is connected with a resistor R7, the output end of the resistor R7 is connected with a resistor R8, the output end of the resistor R8 is connected with a buzzer HA, the output end of the buzzer HA is connected with a diode D1, the output end of the operational amplifier U1 is also connected with a resistor R1, the output end of the resistor R1 is connected with the inverting input end of the operational amplifier U1, the output end of the resistor R2 is connected with the inverting input end of the operational amplifier U2, the output end of the resistor R2 is also connected with a resistor R3, the output end of the resistor R3 is connected with the output end of the operational amplifier U2 is connected with the negative electrode of the capacitor C2, and the output end of the operational amplifier U2 is connected with the grounding end of the capacitor C2;
the output end of the operational amplifier U2 is also connected with a resistor R5, the output end of the resistor R5 is connected with a resistor R9, the output end of the resistor R5 is also connected with an operational amplifier U3, the non-inverting input end of the operational amplifier U3 is connected to the output end of the resistor R4, the positive electrode of the operational amplifier U3 is connected with a capacitor C3, the negative electrode of the capacitor C3 is grounded, the negative electrode of the operational amplifier U3 is connected with a grounding end GND, the output end of the operational amplifier U3 is connected to the resistor R9, the output end of the operational amplifier U3 is also connected with a resistor R10, the output end of the resistor R10 is connected with an adjustable resistor Rp, one end of the adjustable resistor Rp is connected with a resistor R11, one end of the resistor R11 is connected with a capacitor C5, one end of the capacitor C5 and the resistor R11 form a series circuit, the output end of the series circuit is grounded, the two ends of the capacitor C5 are connected with a current detection table, one end of the adjustable resistor Rp 4 is also connected with the operational amplifier U4, the inverting input end of the operational amplifier U4 is connected to the output end of the resistor R7, the output end of the operational amplifier U4 is connected to the positive electrode of the resistor R4 is grounded, the negative electrode of the resistor C4 is connected to the resistor D1 is connected to the negative electrode of the resistor D12, and the output end of the diode is connected to the resistor D1 is grounded.
The displacement monitoring device comprises an input voltage Ui, one end of the input voltage Ui is connected to a crank arm structure, one end of the input voltage Ui is connected with a resistor R13 and a resistor R14, the resistor R13 is connected with the resistor R14 in series, one end of the resistor R13 and one end of the resistor R14 are also connected with a triode Q1, the collector of the triode Q1 is connected with a resistor R15, one end of the resistor R15 is connected to the resistor R13, the emitter of the triode Q1 is connected with a resistor R16, one end of the resistor R16 is connected to the resistor R14, the emitter of the triode Q1 is also connected with a capacitor C7, one end of the capacitor C7 is connected to the resistor R16, and the other end of the capacitor C7 is connected with a capacitor C6;
one end of the capacitor C6 is connected with an inductance coil L1, two ends of the inductance coil L1 are connected with an LCR meter, one end of the inductance coil L1 is connected with a capacitor C10, one end of the capacitor C10 is connected to the output end of the capacitor C7, the inductance coil L1 and the capacitor C10 form a series circuit, and two ends of the series circuit are connected with a capacitor C9 in parallel;
one end of the capacitor C6 is further connected with a capacitor C8, one end of the capacitor C8 is connected with a resistor R17, one end of the resistor R17 is connected to a resistor R15, one end of the capacitor C8 is further connected with a triode Q2, a collector of the triode Q2 is connected to the resistor R17, an emitter of the triode Q2 is connected with a resistor R18, a negative electrode of the resistor R18 is grounded, an emitter of the triode Q2 is further connected with a capacitor C11, a collector of the triode Q2 is further connected with a capacitor C12, a negative electrode of the capacitor C12 is grounded, one end of the capacitor C12 is connected with an inductance coil L2, an output end of the inductance coil L2 is connected to the capacitor C11, and an output end of the inductance coil L2 and the capacitor C10 is connected with an output voltage Uo.
The crank arm structure comprises a sliding block 8, a crank arm 10, a crank arm shaft 11, a first bearing 20 and a second bearing 23, one end of the crank arm 10 is connected with the sliding block 8 through a pin shaft 9 with holes, round holes are formed in the connecting ends of the crank arm 10 and the sliding block 8, a round shaft 16 capable of rotating freely is arranged in the round holes, two ends of the round shaft 16 are limited and fixed through a spring gasket 17 for a shaft, a hexagonal through hole is formed in the other end of the crank arm 10 and matched with a hexagonal nut head type boss of the crank arm shaft 11, and the two ends of the crank arm shaft 11 and the shell 14 are connected with the second bearing 23 through the first bearing 20.
In this embodiment, when the neutral point grounding switch needs to be switched on, the crank shaft 11 is controlled to rotate anticlockwise, so that the neutral point grounding switch can work normally, when the neutral point grounding switch needs to be switched off, the crank shaft 11 is controlled to rotate clockwise, the switching off can be realized, and when the neutral point grounding switch is in a switching off state, a worker can overhaul the inside of the neutral point grounding switch, at the moment, whether the crank shaft 11 rotates in place is required to be judged, thereby ensuring that the neutral point grounding switch is switched on, at the moment, the crank shaft 11 is detected in real time through a current detection device and a displacement monitoring device, if the crank shaft 11 is not completely switched off, the crank shaft 11 is electrified at the moment, a transient current is obtained through measuring the potential difference between two ends of a sampling resistor R4 and a sampling resistor R5 connected to the crank shaft 11, a differential amplifier formed by a voltage follower formed by an operational amplifier U1 and a voltage follower U2 is provided with isolation impedance for an input end of a differential amplifier formed by a measured circuit U3, and a differential amplifier R2 is simultaneously required to be judged whether the crank shaft 11 rotates in place or not, and then the differential amplifier U2 is required to be equal to the differential amplifier formed by a differential amplifier, the differential amplifier is enabled to be an inverting amplifier, and the differential amplifier is enabled to be enabled to output by a small value equal to a current when the differential amplifier is enabled to be an inverting current, and a current is enabled to be an output by a small value, and a small value is enabled to be an equal to a small value, and a small value is convenient, and a stable value is enabled, and a current is enabled to be an input by a differential amplifier and HAs a small value. At the moment, the buzzer HA is electrified to make a sound, current flows to the diode D1 after flowing through the buzzer HA, the diode D1 emits light at the moment, the whole circuit becomes an alarm circuit at the moment, and the staff is prompted that the crank arm shaft 11 is electrified and is not completely disconnected;
when the displacement monitoring device is used for detecting the crank arm shaft 11, when the crank arm shaft 11 is electrified, a magnetic field is generated around the crank arm shaft 11, an eddy current is generated through the change of the magnetic field, when the eddy current flows in a closed loop, a secondary magnetic field is generated, when the inductance coils L1 and L2 are electrified, a primary magnetic field is generated, the existence of the crank arm shaft 11 close to the inductance coils L1 and L2 is induced due to the interaction of the secondary magnetic field generated by the eddy current, the change of the magnetic field around the crank arm shaft 11 can cause the change of oscillation frequency, the change of inductance of a coil can be influenced, the distance between the crank arm shaft 11 and a conductor 1 can be indirectly reflected through the change of the impedance of the coil, the influence of the output voltage distribution capacitance can be completely connected in parallel to the large capacitances C6 and C7 through the series connection of the inductance coil L1 and the capacitance C10, therefore, the influence on the resonance frequency is reduced, through LCR meters connected to two ends of the inductance coil L1, the coil inductance value L of the inductance coil L1 at the moment can be displayed in real time in the moving and rotating process of the crank shaft 11, the coil impedance Z is in direct proportion to the coil inductance L as the coil impedance Z=jωL is larger, the magnetic field around the crank shaft 11 is stronger when the coil inductance L value is larger, the crank shaft 11 is close to the conductor 1 and is not completely disconnected, the crank shaft 11 is gradually separated from the conductor 1 when the coil inductance L value is gradually reduced, the magnetic field of the crank shaft 11 is disappeared when the coil inductance L value is gradually reduced and becomes 0, and the crank shaft 11 is powered off and is completely separated from the conductor 1, so that the crank shaft 11 is completely disconnected.
Embodiment two: referring to fig. 1-9, on the basis of the first embodiment, a technical scheme of a transformer gas-insulated neutral point grounding switch is provided, the grounding mechanism comprises an internal grounding copper bar 4, an insulated grounding seat 5 and an external grounding copper bar 6, one end of the internal grounding copper bar 4 is connected with a base 2, the other side is connected with one end of the insulated grounding seat 5, the insulated grounding seat 5 is mounted on a shell 14, the other side of the insulated grounding seat 5 is connected with the external grounding copper bar 6, and the external grounding copper bar 6 is subjected to grounding treatment in the running process of equipment.
One end of the shell 14 is connected with the base 2, the conductor 1 passes through the base 2 and is connected with the sliding block 8, an insulating sheath I3 is arranged between the base 2 and the shell 14, an insulating cover plate 25 is arranged on the base 2, a metal pressing plate 26 is arranged on the insulating cover plate 25, a connecting bolt is arranged on the metal pressing plate 26, and an insulating base plate 15 and an insulating sheath II 7 are arranged at the joint of the conductor 1 and the sliding block 8 and are insulated and separated.
Two raised dots are arranged on two sides of the insulating base plate 15, two concave dots are arranged on the connecting surfaces of the conductor 1 and the sliding block 8, the two sides of the insulating base plate 15 are embedded into the concave dots of the conductor 1 and the sliding block 8 to limit, an inner hexagon screw head is arranged on one side of the insulating sheath II 7, and the inner hexagon screw head for installation is protected on the height of the insulating sheath II 7.
The contact surface of the conductor 1 and the base 2 is provided with a guide ring 12 and a spring contact finger 13, and the conductor 1 is electrically connected with the base 2 through the spring contact finger 13.
The flange is installed on both sides of the lower part of the shell 14, a first sealing ring 19, a second sealing ring 21 and a third sealing ring 24 are sequentially arranged in the flange, the first connecting lever shaft 11 sequentially penetrates through the first bearing 20, the second connecting lever 10 and the second bearing 23 when being installed, the flange on both sides of the shell 14 is covered by the first cover plate 18 and the second cover plate 22 after the installation is completed, the base 2 is provided with an installation hand hole 27, and the first cover plate 18 and the second cover plate 22 are used for covering and sealing after the installation of the conductor in the shell 14 is completed.
The conductor 1 is driven to move forwards and backwards by rotating the crank shaft 11, so that the connection and disconnection of the conductor 1 and a neutral point conductor are realized, the crank structure is connected with a control module, the control module is connected with an electric mechanism, the electric mechanism is connected with a computer processor, and the on-site operation and remote control of the neutral point grounding switch are realized through the computer processor, the electric mechanism and the control module.
In this embodiment, through setting up insulating sheath one 3 between base 2 and casing 14, then cover insulating apron 25 on base 2, then bolt hole position embedding is fixed base 2 with casing 14, then press metal clamp plate 26 on insulating apron 25 again, connecting bolt installs on metal clamp plate 26, thereby can fix metal clamp plate 26 with insulating apron 25, through setting up insulating backing plate 15 and insulating sheath two 7 in the junction of slider 8 in conductor 1 and the turning arm structure, and carry out the spacing in the recess of insulating backing plate 15 two-sided dot embedding conductor 1 and slider 8, when installing turning arm 11, pass bearing one 20 in proper order, turning arm 10 and bearing two 23, cover the flange on casing 14 both sides with apron one 18 and apron two 22 after the installation is accomplished, and set up the boss on apron one 18 and apron two 22, press bearing one 20 and bearing two 23 with the boss, cover the sealing with apron two 22 after the installation of inner conductor is accomplished, thereby the good insulating properties of casing 14 has been guaranteed, this gas insulated switch is connected with neutral point and neutral point that can realize the complete switching of gas-phase connection with the gas-filled switch, thereby can realize closing a switch with the rotary switch through the control of the neutral point and the gas-phase-filled state, the complete switching device can be connected with the rotary switch and can be opened or closed through the control of the neutral point, thereby the state has been realized.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, who is within the scope of the present application, should make equivalent substitutions or modifications according to the technical scheme of the present application and the inventive concept thereof, and should be covered by the scope of the present application.
Claims (5)
1. The gas-insulated neutral point grounding switch of the transformer is characterized by comprising a conductor (1), a base (2), a shell (14), a crank arm structure and a grounding structure, wherein the base (2) is arranged at the top of the shell (14), the conductor (1) passes through the middle of the base (2) and is connected with the crank arm structure, and the other surface of the base (2) is connected with the grounding mechanism;
wherein the crank arm structure comprises a sliding block (8), a crank arm (10), a crank arm shaft (11), a first bearing (20) and a second bearing (23), one end of the crank arm (10) is connected with the sliding block (8) through a pin shaft (9) with holes, round holes are formed in the connecting ends of the crank arm (10) and the sliding block (8), a circular shaft (16) capable of freely rotating is arranged in the round holes, two ends of the circular shaft (16) are limited and fixed by adopting a spring gasket (17) for the shaft, a hexagonal through hole is formed in the other end of the crank arm (10), the hexagonal through hole is matched with the first bearing (11) and the second bearing (23), two ends of the crank arm shaft (11) and the shell (14) are connected with the second bearing (23) through the first bearing (20), one end of the shell (14) is connected with a base (2), a conductor (1) penetrates through the base (2) and is connected with the sliding block (8), an insulating sheath (3) is arranged between the base (2) and the shell (14), a metal pressing plate (25) is arranged on the base (2), a metal pressing plate (25) is arranged on the metal pressing plate (25), an insulating base plate (15) and a second insulating sheath (7) are arranged at the joint of the conductor (1) and the sliding block (8) and are insulated and separated;
the conductor (1) is driven to move forwards and backwards by rotating the crank arm shaft (11), so that the connection and disconnection of the conductor (1) and a neutral point conductor are realized, a crank arm structure is connected with a control module, the control module is connected with an electric mechanism, the electric mechanism is connected with a computer processor, and the on-site operation and remote control of a neutral point grounding switch are realized through the computer processor, the electric mechanism and the control module;
the crank arm structure is also connected with a current detection device and a displacement monitoring device, and whether the crank arm shaft (11) and the conductor (1) are completely disconnected or not is detected through the current detection device and the displacement monitoring device;
the current detection device comprises an input current Li, wherein the output end of the input current Li is respectively connected with an operational amplifier U1 and an operational amplifier U2, the positive electrode of the operational amplifier U1 is connected with a capacitor C1, the output end of the capacitor C1 is grounded, the negative electrode of the operational amplifier U1 is connected with a grounding end GND, the output end of the operational amplifier U1 is connected with a resistor R4, the output end of the resistor R4 is connected with a resistor R6, the output end of the resistor R6 is connected with a resistor R7, the output end of the resistor R7 is connected with a resistor R8, the output end of the resistor R8 is connected with a buzzer HA, the output end of the buzzer HA is connected with a diode D1, the output end of the operational amplifier U1 is connected with an inverting input end of the operational amplifier U1, the output end of the resistor R1 is also connected with a resistor R2, the output end of the resistor R2 is connected with the inverting input end of the operational amplifier U2, the output end of the resistor R2 is connected with the grounding end of the resistor U2, and the output end of the resistor C2 is connected with the grounding end of the resistor U2;
the output end of the operational amplifier U2 is also connected with a resistor R5, the resistor R4 and the resistor R5 are connected to a crank shaft (11) so as to judge whether the state of the crank shaft (11) is completely electrified, the output end of the resistor R5 is also connected with a resistor R9, the output end of the resistor R5 is also connected with an operational amplifier U3, the non-inverting input end of the operational amplifier U3 is connected to the output end of the resistor R4, the positive electrode of the operational amplifier U3 is connected with a capacitor C3, the negative electrode of the capacitor C3 is grounded, the negative electrode of the operational amplifier U3 is connected with a ground end GND, the output end of the operational amplifier U3 is connected to the resistor R9, the output end of the operational amplifier U3 is also connected with a resistor R10, the output end of the resistor R10 is connected with an adjustable resistor Rp, one end of the adjustable resistor R11 is connected with a resistor R11, one end of the resistor R11 is connected with a capacitor C5, the capacitor C5 is connected with the output end of the resistor R11 and the resistor R4 in series, the negative electrode of the resistor U4 is connected with the negative electrode 4 is connected with the output end GND, the output end of the resistor U4 is connected with the resistor R4 is connected with the negative electrode 4 in series, the output end of the resistor U4 is connected with the resistor R4 is connected with the negative electrode 4 is connected with the resistor C4, and the output end of the resistor R4 is connected with the resistor C4;
the displacement monitoring device comprises an input voltage Ui, one end of the input voltage Ui is connected to a crank arm structure, one end of the input voltage Ui is connected with a resistor R13 and a resistor R14, the resistor R13 is connected with the resistor R14 in series, one end of the resistor R13 and one end of the resistor R14 are also connected with a triode Q1, a collector of the triode Q1 is connected with a resistor R15, one end of the resistor R15 is connected to the resistor R13, an emitter of the triode Q1 is connected with a resistor R16, one end of the resistor R16 is connected to the resistor R14, an emitter of the triode Q1 is also connected with a capacitor C7, one end of the capacitor C7 is connected to the resistor R16, and the other end of the capacitor C7 is connected with a capacitor C6;
one end of the capacitor C6 is connected with an inductance coil L1, two ends of the inductance coil L1 are connected with an LCR meter, one end of the inductance coil L1 is connected with a capacitor C10, one end of the capacitor C10 is connected to the output end of the capacitor C7, the inductance coil L1 and the capacitor C10 form a series circuit, and two ends of the series circuit are connected with a capacitor C9 in parallel;
the one end of electric capacity C6 still is connected with electric capacity C8, electric capacity C8's one end is connected with resistance R17, electric capacity R17's one end is connected on resistance R15, electric capacity C8's one end still is connected with triode Q2, triode Q2's collecting electrode is connected on resistance R17, triode Q2's projecting pole is connected with resistance R18, resistance R18's negative pole ground connection, triode Q2's projecting pole still is connected with electric capacity C11, triode Q2's collecting electrode still is connected with electric capacity C12, electric capacity C12's negative pole ground connection, electric capacity C12's one end is connected with inductor L2, inductor L2's output is connected on electric capacity C11, inductor L2 and electric capacity C10's output is connected with output voltage Uo.
2. The transformer gas-insulated neutral point grounding switch according to claim 1, characterized in that the grounding mechanism comprises an internal grounding copper bar (4), an insulating grounding seat (5) and an external grounding copper bar (6), one end of the internal grounding copper bar (4) is connected with the base (2), the other side is connected with one end of the insulating grounding seat (5), the insulating grounding seat (5) is mounted on the shell (14), the other side of the insulating grounding seat (5) is connected with the external grounding copper bar (6), and the external grounding copper bar (6) is subjected to grounding treatment in the equipment operation process.
3. The transformer gas-insulated neutral point grounding switch according to claim 1, wherein two convex dots are arranged on two sides of the insulating base plate (15), two concave dots are arranged on the connecting surfaces of the conductor (1) and the sliding block (8), the two side dots of the insulating base plate (15) are embedded into the concave dots of the conductor (1) and the sliding block (8) to limit, an inner hexagon screw head is arranged on one side of the insulating sheath II (7), and the inner hexagon screw head for installation is protected on the height of the insulating sheath II (7).
4. A transformer gas-insulated neutral point grounding switch according to claim 1, characterized in that the contact surface of the conductor (1) and the base (2) is provided with a guide ring (12) and spring contact fingers (13), and the conductor (1) is electrically connected with the base (2) through the spring contact fingers (13).
5. The transformer gas-insulated neutral point grounding switch according to claim 1, wherein flanges are installed on two sides of the lower portion of the housing (14), a first sealing ring (19), a second sealing ring (21) and a third sealing ring (24) are sequentially arranged in the flanges, a crank shaft (11) sequentially penetrates through a first bearing (20), a crank arm (10) and a second bearing (23) during installation, the flanges on two sides of the housing (14) are covered by a first cover plate (18) and a second cover plate (22) after the installation is completed, mounting hand holes (27) are formed in the base (2), and the first cover plate (18) and the second cover plate (22) are used for covering and sealing after the installation of an inner conductor of the housing (14) is completed.
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| CN202310814871.6A CN116544046B (en) | 2023-07-05 | 2023-07-05 | Gas-insulated neutral point grounding switch of transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310814871.6A CN116544046B (en) | 2023-07-05 | 2023-07-05 | Gas-insulated neutral point grounding switch of transformer |
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| CN116544046B true CN116544046B (en) | 2023-10-03 |
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| CN207338214U (en) * | 2017-11-10 | 2018-05-08 | 湖南长高电气有限公司 | A kind of high speed grounding switch of new 110kv compound combined electrical equipments |
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| CN109217250A (en) * | 2018-10-11 | 2019-01-15 | 天津择东能源科技股份有限公司 | A kind of closed intelligent protection device of 110kV and 220kV transformer neutral point and guard method |
| CN112038962A (en) * | 2020-09-09 | 2020-12-04 | 国网山东省电力公司沂南县供电公司 | Handcart grounded under handcart switch cabinet and method |
| CN214626344U (en) * | 2021-01-27 | 2021-11-05 | 西安豪特电力开关制造有限公司 | Transformer neutral point complete device |
| CN114203476A (en) * | 2021-12-15 | 2022-03-18 | 江苏安靠智能输电工程科技股份有限公司 | Isolating switch for transformer neutral point overvoltage protection gas insulation grounding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62214365A (en) * | 1986-03-17 | 1987-09-21 | Ngk Insulators Ltd | Switch |
| JPH11153628A (en) * | 1997-11-20 | 1999-06-08 | Nissin Electric Co Ltd | Received voltage detecting device for gas insulated electric equipment |
| JP2000082367A (en) * | 1999-10-12 | 2000-03-21 | Hitachi Ltd | Switch and switch gear |
| CN207743138U (en) * | 2017-11-07 | 2018-08-17 | 国家电网公司 | Reduce the personnel protection system of failure phase residual voltage |
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| CN112038962A (en) * | 2020-09-09 | 2020-12-04 | 国网山东省电力公司沂南县供电公司 | Handcart grounded under handcart switch cabinet and method |
| CN214626344U (en) * | 2021-01-27 | 2021-11-05 | 西安豪特电力开关制造有限公司 | Transformer neutral point complete device |
| CN114203476A (en) * | 2021-12-15 | 2022-03-18 | 江苏安靠智能输电工程科技股份有限公司 | Isolating switch for transformer neutral point overvoltage protection gas insulation grounding |
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| CN116544046A (en) | 2023-08-04 |
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