CN117277062A - Quick clearing method for triggering gap switch and preventing detonation of converter transformer - Google Patents
Quick clearing method for triggering gap switch and preventing detonation of converter transformer Download PDFInfo
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- CN117277062A CN117277062A CN202311172848.8A CN202311172848A CN117277062A CN 117277062 A CN117277062 A CN 117277062A CN 202311172848 A CN202311172848 A CN 202311172848A CN 117277062 A CN117277062 A CN 117277062A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005474 detonation Methods 0.000 title claims description 17
- 238000004880 explosion Methods 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 53
- 230000009471 action Effects 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims description 50
- 230000007704 transition Effects 0.000 claims description 32
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000005684 electric field Effects 0.000 claims description 10
- 238000010891 electric arc Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 6
- 239000012212 insulator Substances 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 238000004200 deflagration Methods 0.000 abstract description 4
- 210000002381 plasma Anatomy 0.000 description 14
- 238000002679 ablation Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T2/00—Spark gaps comprising auxiliary triggering means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/20—Means for starting arc or facilitating ignition of spark gap
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The application discloses trigger clearance switch and prevent quick clear method of converter transformer deflagration, trigger clearance switch includes trigger clearance body and trigger control unit. The triggering gap body comprises a high-voltage electrode, a low-voltage electrode and a metal wire electric explosion device, a gap is reserved between the high-voltage electrode and the metal wire electric explosion device, the metal wire electric explosion device is arranged on the high-voltage electrode and the metal wire electric explosion device generates plasma under the action of electric pulse, and the metal wire electric explosion device penetrates through the gap, so that the high-voltage electrode and the metal wire electric explosion device are in touch connection. The trigger control unit comprises a trigger and a controller, wherein the trigger provides electric pulses for the wire electric explosion device, and the controller controls the trigger to work. The trigger gap switch can quickly clear the fault when the extra-high voltage converter transformer has a short-circuit fault, and greatly shortens the fault clearing time.
Description
Technical Field
The application relates to the field of high-voltage electric appliances of power systems, in particular to a quick clearing method for triggering a gap switch and preventing detonation of a converter transformer.
Background
The extra-high voltage converter transformer is core equipment for realizing energy conversion and transmission in extra-high voltage engineering, and the reliability of the extra-high voltage converter transformer directly influences the safe and stable operation of an extra-high voltage transmission system. When the extra-high voltage converter transformer has an internal short circuit fault, an electric arc in high-energy oil can be generated, a large mechanical impact force is generated, a large amount of high-temperature high-pressure oil gas is generated, and cracking and explosion of a converter transformer shell are easily caused. The fault current on-off time of the conventional SF6 circuit breaker is 40-50ms, so that the arc deflagration prevention in oil is difficult to clean quickly in time.
Disclosure of Invention
The application provides a trigger gap switch and a quick clearing method for preventing detonation of a converter transformer, which can quickly clear faults and greatly shorten fault clearing time when a short circuit fault occurs to the extra-high voltage converter transformer.
The embodiment of the application provides a trigger gap switch, which comprises a trigger gap body and a trigger control unit. The triggering gap body comprises a high-voltage electrode, a low-voltage electrode and a metal wire electric explosion device, a gap is reserved between the high-voltage electrode and the metal wire electric explosion device, the metal wire electric explosion device is arranged on the high-voltage electrode and the metal wire electric explosion device generates plasma under the action of electric pulse, and the metal wire electric explosion device penetrates through the gap, so that the high-voltage electrode and the metal wire electric explosion device are in touch connection. The trigger control unit comprises a trigger and a controller, wherein the trigger provides electric pulses for the wire electric explosion device, and the controller controls the trigger to work.
In some of these embodiments, the high voltage electrode has a high voltage electrode cavity for housing the wire electric explosion device, and the wall of the high voltage electrode cavity has a high voltage electrode nozzle for the plasma generated by the wire electric explosion device to be ejected into the gap space between the high voltage electrode and the high voltage electrode. The low-voltage electrode is provided with a low-voltage electrode inner cavity, the low-voltage electrode inner cavity is used for accommodating the metal wire electric explosion device, the wall surface of the low-voltage electrode inner cavity is provided with a low-voltage electrode nozzle, the low-voltage electrode nozzle and the high-voltage electrode nozzle are oppositely arranged, and the low-voltage electrode nozzle is used for emitting plasma generated by the metal wire electric explosion device.
In some of these embodiments, the trigger gap body further comprises a composite sleeve, an outlet cover plate, a lower conductive rod, a lower fixed support plate, an upper fixed support plate, an insulating support, a contact block, a grading ring, an upper cover plate, and an upper conductive rod. The composite sleeve is vertically arranged, and the inner cavity of the composite sleeve is filled with insulating gas. The outlet cover plate is arranged at the lower part of the composite sleeve, and the outlet cover plate is used for connecting a low-voltage lead of the power system. The lower conducting rod is vertically connected to the upper part of the outlet cover plate, and the upper part of the lower conducting rod is connected with the voltage electrode. The lower fixed support plate is vertically connected to the upper part of the lower conducting rod, and the upper part of the lower fixed support plate is provided with a voltage electrode. The upper fixed support plate is arranged above the lower fixed support plate in parallel, and the lower high-voltage electrode of the upper fixed support plate is arranged. The insulating support is vertically connected with the lower fixed support plate and the upper fixed support plate, and is used for guaranteeing neutrality of the low-voltage electrode arranged on the lower fixed support plate and the high-voltage electrode arranged on the upper fixed support plate. The contact seat is connected with the upper part of the upper fixed supporting plate, and the contact seat is connected with the high-voltage electrode. The grading ring surrounds the upper portion periphery at compound sleeve pipe, and the grading ring is used for improving compound sleeve pipe outside electric field intensity, prevents to take place the flashover. The upper cover plate is covered on the upper part of the composite sleeve, and the upper cover plate is used for connecting high-voltage leads of the power system. The upper conducting rod is vertically connected to the lower part of the upper cover plate, and the lower part of the upper conducting rod is connected with the contact seat.
In some of these embodiments, the trigger gap body further comprises an upper shield grading ring and a lower shield grading ring. The upper shielding equalizing ring surrounds the periphery of the high-voltage electrode, the upper shielding equalizing ring is connected to the upper fixed supporting plate, and the upper shielding equalizing ring is used for enabling an electric field at the gap to be uniform. The lower shielding equalizing ring surrounds the periphery of the low-voltage electrode, and is connected to the lower fixed support plate, and the lower shielding equalizing ring is used for enabling the electric field at the gap to be uniform.
In some of these embodiments, the trigger gap body further comprises an arc shield. The arc-proof cover surrounds the periphery of the high-voltage electrode and the low-voltage electrode, the upper part of the arc-proof cover is connected to the upper fixed supporting plate, the lower part of the arc-proof cover is connected to the lower fixed connecting plate, the arc-proof cover is arranged on one side, close to the high-voltage electrode and the low-voltage electrode, of the insulating support, the upper shielding equalizing ring and the lower shielding equalizing ring, and the protective cover is used for preventing arcs generated by the high-voltage electrode and the low-voltage electrode from ablating the wall of the composite sleeve in the moving process.
In some embodiments, the lower fixed support plate is arranged in an insulating manner with the low-voltage electrode, the lower fixed support plate, the upper fixed support plate and the upper shielding equalizing ring form a primary capacitor, and the lower fixed support plate is connected with a secondary capacitor to form a capacitor voltage divider, so that instantaneous voltages at two ends of the trigger gap are detected.
In some of these embodiments, the firing gap body further comprises a metal transition barrel, a density relay, a lower cover plate, and a transition composite sleeve. The metal transition cylinder is vertically arranged, the cylinder wall of the metal transition cylinder is provided with an inflation inlet, insulating gas is inflated into the inflation inlet, and an explosion-proof membrane is arranged at the inflation inlet. The density relay is connected to the wall of the metal transition cylinder and is used for detecting the density of the insulating gas. The lower cover plate is covered at the lower part of the metal transition cylinder. The upper part of the metal transition cylinder is communicated with the lower part of the composite sleeve by the transition composite sleeve, and the transition composite sleeve is used for preventing the metal transition cylinder filled with insulating gas from flowing through the composite sleeve.
In some of these embodiments, the trigger includes a capacitor, a thyristor assembly, and a charger. The capacitor is connected with the wire electric explosion device and is used for providing electric pulse for the wire electric explosion device. The thyristor component is connected with the controller and the capacitor, receives the instruction of the controller and controls the capacitor to provide electric pulse for the wire electric explosion device. The charger is connected with the capacitor and charges the capacitor.
The embodiment of the application also provides a quick clearing device for preventing detonation of converter transformer, which comprises a bracket, a trigger gap switch, an energy supply transformer, a low-voltage side trigger box, a high-voltage side trigger box, a box equalizing ring and an optical fiber insulator. The trigger gap switch comprises two groups of trigger control units which are in communication connection. The trigger clearance body is arranged on the bracket. The energy supply transformer is arranged on the bracket. The low pressure side trigger case sets up at the support, and sets up in the clearance body below that triggers. The low-voltage side trigger box is provided with a group of trigger control units. The high-pressure side trigger box is arranged on the support and above the trigger gap body, and the high-pressure side trigger box is used for setting another group of trigger control units. The box equalizing ring is arranged at the upper part of the high-pressure side trigger box. The optical fiber insulator is connected with two groups of trigger control units in the low-voltage side trigger box and the high-voltage side trigger box.
The embodiment of the application also provides a quick clearing method for preventing detonation of the converter transformer by triggering the clearance switch in the embodiment or the quick clearing equipment in the embodiment, which comprises the following steps: the trigger gap switch is connected between the converter transformer and the network side power supply, and the converter valve is connected between the converter transformer and the direct current power supply, so that when a short circuit fault occurs in the converter transformer, the converter valve is blocked, the trigger gap switch conducts the high-voltage electrode and the low-voltage electrode to form a low-resistance channel, and an arc in oil caused by the short circuit fault is transferred and extinguished.
The embodiment of the application also provides a quick clearing system for preventing the detonation of the converter transformer, which comprises the converter transformer, a network side power supply, a direct current power supply and the quick clearing device for preventing the converter transformer, wherein the quick clearing device is used for triggering the gap switch or the quick clearing device. The trigger gap switch is connected between the converter transformer and the grid-side power supply, the converter valve is connected between the converter transformer and the direct current power supply, when a short circuit fault occurs in the converter transformer, the converter valve is blocked, the metal wire electric explosion device generates plasma under the action of electric pulse to conduct the high-voltage electrode and the low-resistance electrode to form a low-resistance channel, and the electric arc in oil caused by the short circuit fault is transferred and extinguished.
According to the embodiment of the application, the trigger gap switch comprises a trigger gap body and a trigger control unit. The triggering gap body comprises a high-voltage electrode, a low-voltage electrode and a metal wire electric explosion device, a gap is reserved between the high-voltage electrode and the metal wire electric explosion device, the metal wire electric explosion device is arranged on the high-voltage electrode and the metal wire electric explosion device generates plasma under the action of electric pulse, and the metal wire electric explosion device penetrates through the gap, so that the high-voltage electrode and the metal wire electric explosion device are in touch connection. The trigger control unit comprises a trigger and a controller, wherein the trigger provides electric pulses for the wire electric explosion device, and the controller controls the trigger to work. When the short circuit fault occurs in the converter transformer, the controller controls the trigger to generate electric pulses, so that the metal wire electric explosion device generates plasmas under the action of the electric pulses, through gaps are formed, the high-voltage electrode and the low-voltage electrode are communicated to form a low-resistance channel, and the arc in oil caused by the short circuit fault is transferred to be extinguished, so that the fault can be rapidly cleared when the short circuit fault occurs in the extra-high voltage converter transformer, the fault clearing time is greatly shortened, the operation reliability and the safety of the converter transformer are improved, and the safe and stable operation level of an extra-high voltage transmission system in China is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a trigger gap switch according to an embodiment of the present application;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a front view of a quick purge device for preventing detonation of converter transformer in an embodiment of the present application;
FIG. 4 is a side view of a quick clearance apparatus for preventing detonation of converter transformer in an embodiment of the present application;
FIG. 5 is a partial top view of a quick-clean-up apparatus for preventing detonation of converter transformer in an embodiment of the present application;
fig. 6 is a schematic diagram of the connection of the trigger gap switch in the fast purge system for preventing detonation of the converter transformer according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Referring to fig. 1-2, embodiments of the present application provide a trigger gap switch, including a trigger gap body 1 and a trigger control unit.
The triggering gap body 1 comprises a composite sleeve 103, an outgoing line cover plate 112, a lower conductive rod 111, a lower fixed support plate 120, a low-voltage electrode 110, an upper fixed support plate 122, a high-voltage electrode 108, an insulating support 107, a contact base 105, a grading ring 101, an upper cover plate 102, an upper conductive rod 104, a low-voltage electrode 110, a wire electric explosion device, an upper shielding grading ring 106, a lower shielding grading ring 119, an arc-proof cover 109, a metal transition cylinder 114, a density relay 118, a lower cover plate 116 and a transition composite sleeve 113.
The composite sleeve 103 is vertically disposed. The inner cavity of the composite sleeve 103 is filled with SF6 insulating gas with specified pressure, so that the insulating requirement is met.
The outlet cover plate 112 is sealed and arranged at the lower part of the composite sleeve 103. The outlet cover 112 is connected to the power system low voltage leads. The outlet cover 112 is provided with a low-voltage side connection terminal 123, and the low-voltage side connection terminal 123 is connected to a low-voltage lead of the power system.
The lower conductive rod 111 is vertically connected to an upper portion of the outlet cover plate 112. The lower conductive rod 111 is disposed on the centerline of the composite sleeve 103.
The lower fixing support plate 120 is vertically connected to an upper portion of the lower conductive rod 111. The center of the lower stationary support plate 120 is disposed on the center line of the composite sleeve 103.
The low voltage electrode 110 is disposed at an upper portion of the lower fixed support plate 120. The low voltage electrode 110 is disposed on the centerline of the composite sleeve 103. The low voltage electrode 110 is connected to an upper portion of the lower conductive rod 111.
The low voltage electrode 110 has a low voltage electrode lumen. The inner cavity of the low-voltage electrode is used for accommodating a plurality of wire electric explosion devices. The upper wall surface of the inner cavity of the low-voltage electrode is provided with a low-voltage electrode nozzle. The low-voltage electrode nozzle is arranged on the centerline of the composite sleeve 103. The electrode nozzle is used for emitting plasma generated by the wire electric explosion device.
The low-voltage electrode 108 is a transverse magnetic self-magnetic field arc rotating electrode, an ablation-resistant CuW70 or CuW80 material is adopted, when large current flows, the arc rotates around the high-voltage electrode, the partial ablation of the arc to the electrode is reduced, the ablation resistance of the electrode is enhanced, the service life of the electrode after the clearance current is triggered is prolonged, and the large current and the rapid insulation recovery after the current flow are realized.
The upper fixed support plate 122 is disposed in parallel above the lower fixed support plate 120. The center of the upper stationary support plate 122 is disposed on the center line of the composite sleeve 103.
The high voltage electrode 108 is disposed at a lower portion of the upper fixed support plate 122. The high voltage electrode 108 is disposed on the centerline of the composite sleeve 103. The high-voltage electrode 108 is disposed opposite to the low-voltage electrode 110 in the vertical direction. There is a gap between the low voltage electrode 110 and the high voltage electrode 108.
The high voltage electrode 108 has a high voltage electrode lumen. The high-voltage electrode inner cavity is used for accommodating a plurality of metal wire electric explosion devices. The lower wall surface of the high-voltage electrode inner cavity is provided with a high-voltage electrode nozzle. The high voltage electrode jets are disposed on the centerline of the composite sleeve 103. The high-voltage electrode nozzle is used for emitting plasma generated by the wire electric explosion device into a gap space between the high-voltage electrode and the high-voltage electrode. The high-voltage electrode nozzle and the high-voltage electrode nozzle are arranged oppositely in the vertical direction.
The high-voltage electrode 108 is a transverse magnetic self-magnetic field arc rotating electrode, an ablation-resistant CuW70 or CuW80 material is adopted, when large current flows, the arc rotates around the high-voltage electrode, the partial ablation of the arc to the electrode is reduced, the ablation resistance of the electrode is enhanced, the service life of the electrode after the clearance current is triggered is prolonged, and the large current and the rapid insulation recovery after the current flow are realized.
The insulating support 107 vertically connects the outer ring of the lower fixing support plate 120 and the outer ring of the upper fixing support plate 122. The number of insulating supports 107 is at least two, the insulating supports 107 being arranged around the centre line of the composite sleeve 103. The above-described insulating support serves to ensure neutrality of the low voltage electrode 110 disposed on the lower fixed support plate 120 and the high voltage electrode 108 disposed on the upper fixed support plate 122. Specifically, in view of the fact that the trigger gap switch is used for the ultra-high voltage level and the ultra-high voltage level, the trigger gap switch is high in overall height, the high-voltage electrode 108 and the low-voltage electrode 110 affect the trigger performance in centering, and in order to fully ensure centering of the high-voltage electrode 108 and the low-voltage electrode 110, the upper fixed support plate 122, the lower fixed support plate 120 and the insulating support 107 are arranged, so that centering of the high-voltage electrode 108 and the low-voltage electrode 110 is ensured.
The contact base 105 is connected to an upper portion of the upper fixed support plate 122. The contact block 105 is disposed on the centerline of the composite sleeve 103. The contact base 105 is connected to the high-voltage electrode 108.
The grading ring 101 surrounds the upper periphery of the composite sleeve 103. The equalizing ring is used for improving the electric field intensity outside the composite sleeve and preventing flashover.
An upper cover plate 102 is sealed and arranged at the upper part of the composite sleeve 103. The upper cover plate 102 is connected to the power system high voltage leads. The upper cover plate 102 is provided with a high-voltage side terminal 121, and the high-voltage side terminal 121 is connected to a high-voltage lead of the power system.
The upper conductive rod 104 is vertically connected to the lower portion of the upper cover plate 102. The upper conductive rod 104 is disposed on the centerline of the composite sleeve 103. The lower part of the upper conductive rod 104 is connected with the contact base 105. Specifically, as the upper cover plate 102 is covered on the upper portion of the composite sleeve 103, the lower portion of the upper conductive rod 104 is extended into the inner cavity of the composite sleeve 103 and then connected to the contact base 105.
The wire electric explosion device is arranged in the high-voltage electrode inner cavity and the low-voltage electrode inner cavity. The wire electric explosion device generates plasma under the action of high-voltage pulse, and the plasma is respectively sprayed to the gap from the high-voltage electrode nozzle and the low-voltage electrode nozzle to cause electric field distortion and penetrate through the gap so that the high-voltage electrode 108 and the low-voltage electrode 110 are in contact. The two-stage opposite spraying mode is adopted in the arrangement, so that the through triggering performance of a long gap is met.
An upper shield grading ring 106 surrounds the outer periphery of the high voltage electrode 108. The upper shield grading ring 106 is attached to an upper stationary support plate 122. The upper shielding equalizing ring is used for making the electric field at the gap uniform.
Based on the above arrangement, the lower fixed support plate 120 is arranged in an insulating manner with the low-voltage electrode 110, the lower fixed support plate 120, the upper fixed support plate 122 and the upper shielding equalizing ring 106 form a primary PF-stage capacitor, and the lower fixed support plate 120 is connected with the secondary capacitor to form a capacitive voltage divider for rapidly detecting the instantaneous voltage at two ends of the trigger gap.
The lower shield grading ring 119 surrounds the outer circumference of the low voltage electrode 110. The lower shield grading ring 119 is attached to the lower stationary support plate 120. The lower shielding equalizing ring is used for making the electric field at the gap uniform.
The arc shield 109 surrounds the outer circumferences of the high voltage electrode 108 and the low voltage electrode 110. The upper portion of the arc prevention cover 109 is inserted into the locking groove of the upper fixing support plate 122, and the lower portion is inserted into the locking groove of the lower fixing connection plate. The arc shield 109 is provided on one side of the insulating support 107, the upper shield grading ring 106, and the lower shield grading ring 119 near the high voltage electrode 108 and the low voltage electrode 110. The shield is used to prevent the arc generated by the high voltage electrode 108 and the voltage electrode 110 from ablating the wall of the composite sleeve 103 during movement. The material of the protective cover is an anti-ablation insulating material, such as polytetrafluoroethylene.
The metal transition cylinder 114 is vertically arranged, the cylinder wall of the metal transition cylinder 114 is provided with an inflation inlet, insulating gas is inflated into the inflation inlet, and an explosion-proof membrane is arranged at the inflation inlet.
A density relay 118 is attached to the wall of the metal transition piece 114. The density relay 118 is used to detect the density of the insulating gas.
A lower cover plate 116 seals the lower portion of the metal transition piece 114. The lower cover plate 116 is provided with an outlet terminal 117, and the outlet terminal 117 is connected with the lower fixed support plate 120 and also connected with the secondary capacitor, so that the lower fixed support plate 120 is connected with the secondary capacitor.
The transition composite sleeve 113 is vertically disposed. The transition composite sleeve 113 communicates the upper portion of the metal transition barrel 114 with the lower portion of the composite sleeve 103. Specifically, the upper portion of the transition composite sleeve 113 is sealingly abutted against the lower portion of the outlet cover plate 112, and the lower portion of the transition composite sleeve 113 is sealingly abutted against the upper portion of the metal transition barrel 114. The transition composite sleeve is used to prevent through-flow of the metal transition cylinder 114 that fills the composite sleeve 103 with insulating gas.
Based on the above arrangement, the composite sleeve 103, the transition composite sleeve 113, and the metal transition barrel 114 form a closed cavity.
The number of trigger control units is at least one group. The trigger control unit includes a trigger and a controller.
A trigger provides the electrical pulse to the wire electric discharge device. The trigger comprises a capacitor, a thyristor assembly and a charger.
The capacitor is connected with the wire electric explosion device and is used for providing electric pulse for the wire electric explosion device.
The thyristor component is connected with the controller and the capacitor, receives the instruction of the controller and controls the capacitor to provide electric pulse for the wire electric explosion device.
The charger is connected with the capacitor and charges the capacitor.
The controller controls the operation of the trigger.
Under the above conditions, when the controller receives the action instruction, the action instruction is sent out, the thyristor component acts, the capacitor enables the trigger cavity of the wire electric explosion device to be in short circuit discharge, the wire detonates, the insulating material is ablated to generate high-density plasma, and the trigger gap is penetrated, so that quick touch-through is realized.
Referring to fig. 3-5, the trigger gap switch of the application is based on a high-performance wire explosion plasma injection trigger mechanism, realizes quick conduction under extremely low working coefficient, can conduct in a sub-millisecond ultra-quick mode, meets the requirements of reliable insulation, high-performance triggering, and quick insulation recovery through large short-circuit current, realizes electric arc in conversion oil in an extra-high voltage converter transformer for 1ms, and improves the operation reliability and safety of converter transformer equipment.
The embodiment of the application also provides a quick clearing device for preventing detonation of converter transformer, and the device is used when triggering gap switch engineering application. The device comprises a bracket 2, a trigger gap switch in the embodiment, an energy supply transformer 3, a low-voltage side trigger box 6, a high-voltage side trigger box 5, a box equalizing ring 7 and an optical fiber insulator 4.
The trigger gap switch has two sets of trigger control units. The two groups of trigger control units are in communication connection. The trigger gap body 1 is arranged on the bracket 2. The high-voltage lead of the trigger gap body 1 is led in through a wiring terminal on the upper cover plate 102, and the grounding wire is led out through a wiring terminal on the lower cover plate 116 to be connected with the grounding grid nearby.
The power supply transformer 3 is arranged on the bracket 2.
The low-pressure side trigger box 6 is arranged on the bracket 2 and below the trigger gap body 1. The low-pressure side trigger box 6 is provided for a set of trigger control units. In the group of trigger control units, the number of the trigger control units is two. The group of trigger control units is a master control system.
The high-pressure side trigger box 5 is arranged on the bracket 2 and above the trigger gap body 1, and the high-pressure side trigger box 5 is provided for another group of trigger control units. In the group of trigger control units, the number of the trigger control units is two.
The tank equalizing ring 7 is arranged at the upper part of the high-pressure side trigger tank 5.
The optical fiber insulator 4 is connected with two groups of trigger control units in the low-voltage side trigger box 6 and the high-voltage side trigger box 5, so that signal communication is realized.
In the arrangement, the upper and lower sets of trigger control units realize double redundancy design.
The device can realize rapid removal of deflagration.
Referring to fig. 6, an embodiment of the present application further provides a method for quickly clearing the detonation of the converter transformer by using the trigger gap switch in the above embodiment or the quick clearing device in the above embodiment, including the following steps:
the trigger gap switch is connected between the converter transformer and the network side power supply, that is, the trigger gap switch is arranged on the converter transformer side to the ground, the converter valve is connected between the converter transformer and the direct current power supply, so that serious faults occur in the converter transformer, for example, when a short circuit occurs, a protection system of the converter transformer detects the change of fault characteristic quantity, the quick response starts to send out relevant action signals, the converter valve is quickly locked, the trigger gap switch triggers and conducts the high-voltage electrode 108 and the low-voltage electrode 110 to form a low-resistance channel within 1ms, electric arcs in oil caused by the short circuit faults are quickly transferred and extinguished, and the explosion is simply and effectively prevented. The trigger gap switch current is disconnected by the SF6 circuit breaker, thereby effectively reducing the risk of converter transformer ignition deflagration.
The embodiment of the application also provides a quick clearing system for preventing the detonation of the converter transformer, which comprises the converter transformer, a network side power supply, a direct current power supply and the quick clearing device for preventing the converter transformer, wherein the quick clearing device is used for triggering the gap switch or the quick clearing device. The trigger gap switch is connected between the converter transformer and the grid-side power supply, the converter valve is connected between the converter transformer and the direct current power supply, when a short circuit fault occurs in the converter transformer, the converter valve is blocked, the metal wire electric explosion device generates plasma under the action of electric pulse to conduct the high-voltage electrode and the low-resistance electrode to form a low-resistance channel, and the electric arc in oil caused by the short circuit fault is transferred and extinguished.
In summary, when the short circuit fault occurs in the converter transformer, the controller controls the trigger to generate electric pulse, so that the metal wire electric explosion device generates plasma under the action of the electric pulse, the through gap enables the high-voltage electrode and the low-voltage electrode to be communicated to form a low-resistance channel, and the electric arc in oil caused by the short circuit fault is transferred to be extinguished, so that the fault can be rapidly cleared when the short circuit fault occurs in the extra-high voltage converter transformer, the fault clearing time is greatly shortened, the operation reliability and the safety of the converter transformer are improved, and the safe and stable operation level of an extra-high voltage transmission system in China is effectively improved.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, this is for convenience of description and simplification of the description, but does not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely used for illustration and are not to be construed as limitations of the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to the specific circumstances.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (11)
1. A trigger gap switch, comprising: a trigger gap body and a trigger control unit;
the triggering gap body comprises a high-voltage electrode, a low-voltage electrode and a metal wire electric explosion device, a gap is formed between the high-voltage electrode and the low-voltage electrode, the metal wire electric explosion device is arranged on the high-voltage electrode and the low-voltage electrode, and the metal wire electric explosion device generates plasma under the action of electric pulse and penetrates through the gap so that the high-voltage electrode and the low-voltage electrode are in contact;
the trigger control unit comprises a trigger and a controller, wherein the trigger provides the electric pulse for the wire electric explosion device, and the controller controls the trigger to work.
2. The triggered gap switch of claim 1,
the high-voltage electrode is provided with a high-voltage electrode inner cavity, the high-voltage electrode inner cavity is used for accommodating the metal wire electric explosion device, the wall surface of the high-voltage electrode inner cavity is provided with a high-voltage electrode nozzle, and the high-voltage electrode nozzle is used for emitting plasma generated by the metal wire electric explosion device into a gap space between the high-voltage electrode and the low-voltage electrode;
the low-voltage electrode is provided with a low-voltage electrode inner cavity, the low-voltage electrode inner cavity is used for accommodating the metal wire electric explosion device, the wall surface of the low-voltage electrode inner cavity is provided with a low-voltage electrode nozzle, the low-voltage electrode nozzle and the high-voltage electrode nozzle are oppositely arranged, and the low-voltage electrode nozzle is used for emitting plasma generated by the metal wire electric explosion device.
3. The trigger gap switch of claim 1, wherein the trigger gap body further comprises:
the composite sleeve is vertically arranged, and an inner cavity of the composite sleeve is filled with insulating gas;
the outlet cover plate is covered on the lower part of the composite sleeve, and the outlet cover plate is used for connecting a low-voltage lead of a power system;
the lower conducting rod is vertically connected to the upper part of the outlet cover plate, and the upper part of the lower conducting rod is used for connecting the low-voltage electrodes;
the lower fixed support plate is vertically connected to the upper part of the lower conducting rod, and the upper part of the lower fixed support plate is provided for the low-voltage electrode;
the upper fixed support plate is arranged above the lower fixed support plate in parallel, and the lower part of the upper fixed support plate is provided with the high-voltage electrode;
an insulation support vertically connecting the lower and upper fixed support plates, the insulation support for securing centering of the low voltage electrode provided at the lower fixed support plate and the high voltage electrode provided at the upper fixed support plate;
the contact seat is connected to the upper part of the upper fixed supporting plate and is connected with the high-voltage electrode;
the grading ring surrounds the periphery of the upper part of the composite sleeve and is used for improving the electric field intensity outside the composite sleeve and preventing flashover;
the upper cover plate is covered on the upper part of the composite sleeve and is used for connecting a high-voltage lead of a power system;
and the upper conducting rod is vertically connected to the lower part of the upper cover plate, and the lower part of the upper conducting rod is connected with the contact seat.
4. The trigger gap switch of claim 3, wherein the trigger gap body further comprises:
the upper shielding equalizing ring is wound around the periphery of the high-voltage electrode and connected with the upper fixed supporting plate, and the upper shielding equalizing ring is used for enabling an electric field at the gap to be uniform;
the lower shielding equalizing ring surrounds the periphery of the low-voltage electrode, the lower shielding equalizing ring is connected with the lower fixed supporting plate, and the lower shielding equalizing ring is used for enabling an electric field at the gap to be uniform.
5. The trigger gap switch of claim 4, wherein the trigger gap body further comprises:
the arc-proof cover surrounds the periphery of the high-voltage electrode and the low-voltage electrode, the upper part of the arc-proof cover is connected to the upper fixed supporting plate, the lower part of the arc-proof cover is connected to the lower fixed connecting plate, the arc-proof cover is arranged on one side, close to the high-voltage electrode and the low-voltage electrode, of the insulating support, the upper shielding equalizing ring and the lower shielding equalizing ring, and the protective cover is used for preventing electric arcs generated by the high-voltage electrode and the low-voltage electrode from ablating the pipe wall of the composite sleeve in the moving process.
6. The triggered gap switch of claim 5,
the lower fixed support plate is arranged in an insulating way with the low-voltage electrode, the lower fixed support plate, the upper fixed support plate and the upper shielding equalizing ring form a primary capacitor, and the lower fixed support plate is connected with a secondary capacitor to form a capacitive voltage divider, so that the instantaneous voltage at two ends of the trigger gap is detected.
7. The trigger gap switch of claim 1, wherein the trigger gap body further comprises:
the metal transition cylinder is vertically arranged, the cylinder wall of the metal transition cylinder is provided with an inflation inlet, the inflation inlet is used for filling the insulating gas, and an explosion-proof membrane is arranged at the inflation inlet;
the density relay is connected to the wall of the metal transition cylinder and is used for detecting the density of the insulating gas;
the lower cover plate is covered at the lower part of the metal transition cylinder;
and the transition composite sleeve is used for preventing the through flow of the metal transition cylinder filled with the insulating gas into the composite sleeve.
8. The triggered gap switch of claim 1, wherein the trigger comprises:
a capacitor connected to the wire electric discharge device, the capacitor being configured to provide the electrical pulse to the wire electric discharge device;
the thyristor assembly is connected with the controller and the capacitor, receives the instruction of the controller and controls the capacitor to provide the electric pulse for the wire electric explosion device;
and the charger is connected with the capacitor and charges the capacitor.
9. A rapid purge apparatus for preventing detonation of converter transformer, comprising:
a bracket;
the trigger gap switch of any one of claims 1-8, said trigger gap switch comprising two sets of trigger control units, said two sets of trigger control units being communicatively connected; the triggering gap body is arranged on the bracket;
the energy supply transformer is arranged on the bracket;
the low-pressure side trigger box is arranged on the bracket and below the trigger gap body; the low-voltage side trigger box is provided with a group of trigger control units;
the high-voltage side trigger box is arranged on the bracket and above the trigger gap body, and is used for being arranged by another group of trigger control units;
the box equalizing ring is arranged at the upper part of the high-pressure side trigger box;
and the optical fiber insulator is connected with the low-voltage side trigger box and the two groups of trigger control units in the high-voltage side trigger box.
10. A quick clearing method for preventing detonation of a converter transformer using the triggered gap switch of any one of claims 1-8 or the quick clearing apparatus of claim 9, comprising the steps of:
the trigger gap switch is connected between the converter transformer and the network side power supply, and the converter valve is connected between the converter transformer and the direct current power supply, so that when a short circuit fault occurs in the converter transformer, the converter valve is blocked, the trigger gap switch conducts the high-voltage electrode and the low-voltage electrode to form a low-resistance channel, and an electric arc in oil caused by the short circuit fault is transferred and extinguished.
11. A quick clearing system for preventing detonation of converter transformer, which is characterized by comprising a converter transformer, a network side power supply, a direct current power supply and the quick clearing device for preventing converter transformer of the trigger gap switch of any one of claims 1-8 or the quick clearing device of claim 9;
the trigger gap switch is connected between the converter transformer and the grid-side power supply, the converter valve is connected between the converter transformer and the direct current power supply, when a short circuit fault occurs in the converter transformer, the converter valve is locked, and the wire electric explosion device generates plasma under the action of electric pulse so as to conduct the high-voltage electrode and the voltage electrode to form a low-resistance channel, and transfer and extinguish an arc in oil caused by the short circuit fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311172848.8A CN117277062A (en) | 2023-09-12 | 2023-09-12 | Quick clearing method for triggering gap switch and preventing detonation of converter transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311172848.8A CN117277062A (en) | 2023-09-12 | 2023-09-12 | Quick clearing method for triggering gap switch and preventing detonation of converter transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117277062A true CN117277062A (en) | 2023-12-22 |
Family
ID=89218816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311172848.8A Pending CN117277062A (en) | 2023-09-12 | 2023-09-12 | Quick clearing method for triggering gap switch and preventing detonation of converter transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117277062A (en) |
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2023
- 2023-09-12 CN CN202311172848.8A patent/CN117277062A/en active Pending
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