CN213401855U - Totally-enclosed controllable transformer neutral point protection discharge gap - Google Patents
Totally-enclosed controllable transformer neutral point protection discharge gap Download PDFInfo
- Publication number
- CN213401855U CN213401855U CN202022696893.1U CN202022696893U CN213401855U CN 213401855 U CN213401855 U CN 213401855U CN 202022696893 U CN202022696893 U CN 202022696893U CN 213401855 U CN213401855 U CN 213401855U
- Authority
- CN
- China
- Prior art keywords
- discharge gap
- fan
- power supply
- plasma jet
- neutral point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Plasma Technology (AREA)
Abstract
The utility model provides a totally-enclosed controllable transformer neutral point protection discharge gap, which comprises a shell, wherein the shell is filled with insulating gas, and a first wall bushing and a second wall bushing are respectively arranged at two ends of the shell; the first and second discharge gap parts are fixed at the end parts of the extending ends of the first and second wall bushing, and a discharge gap is formed between the first discharge gap part and the second discharge gap part; the plasma jet generating device is arranged at the air outlet of the fan and used for generating plasma jet; the utility model forms plasma jet flow between the discharge gaps, the transformer is subjected to overvoltage, and the discharge gaps are immediately conducted when higher voltage appears at the two ends of the discharge gaps; the two discharge gap parts are arranged in the sealed shell structure, the breakdown of the discharge gap is not influenced by external environmental factors, the dispersion of the breakdown voltage of the discharge gap is eliminated, and the discharge gap is prevented from being mistakenly operated under overvoltage and damaged by a transformer.
Description
Technical Field
The utility model belongs to the technical field of power equipment, in particular to totally closed controllable type transformer neutral point protection discharge gap.
Background
In a 110kV and 220kV voltage class power grid, in order to limit zero sequence impedance of a transformer system, a grounding mode that partial transformer neutral points are directly grounded and partial transformer neutral points are not grounded is generally adopted; because the 110kV and 220kV kilovolt transformers usually adopt graded insulation, when neutral points are not grounded, the neutral points are usually grounded in parallel with the lightning arrester through protection gaps for protecting the neutral point insulation; the cooperation principle of the two is as follows: the lightning arrester bears lightning overvoltage and operation overvoltage protection under normal operation conditions; because the ground fault forms a local ungrounded system, the gap should act under the steady state and transient overvoltage of power frequency to protect the neutral point insulation of the transformer and the lightning arrester; the system operates in an effective grounding mode to generate single-phase grounding faults, and the clearance should not act under the steady state and transient overvoltage of power frequency; the standard lightning impulse discharge voltage of the gap is lower than the lightning impulse protection level of the neutral point of the transformer, the lightning arrester cannot tolerate power frequency overvoltage exceeding the rated voltage of the lightning arrester, and the upper limit of the power frequency discharge voltage of the gap is required to be smaller than the rated voltage of the lightning arrester; the principle of the protection is that the lightning arrester is used as main protection of lightning and operation overvoltage under normal operation conditions, the gap is used as backup protection, and once abnormal conditions occur, the gap discharges to protect the lightning arrester.
In the prior art, the insulating medium of the gap is air, the breakdown voltage is influenced by air humidity, temperature, atmospheric pressure and altitude, and the dispersity is high; if the matching is not proper, gap breakdown occurs under the condition of overvoltage protected by the lightning arrester, the lightning arrester is short-circuited and does not play a protection role, and the misoperation of a protection device or the damage of a transformer is caused; in practice, the single-phase grounding transient voltage of the grounding system is often larger than the single-phase grounding steady-state voltage of the ungrounded system, and it is difficult to find a proper gap distance to match with the lightning arrester.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists among the prior art, the utility model provides a totally closed controllable type transformer neutral point protection discharge gap to the insulating medium who solves current clearance structure is the air, and breakdown voltage receives the environmental impact to influence great, and the dispersibility is great, easily causes the technical problem that protection device maloperation or transformer damaged.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a totally-enclosed controllable transformer neutral point protection discharge gap, which comprises a shell, a first discharge gap piece, a second discharge gap piece, a first wall bushing, a second wall bushing, a fan and a plasma jet generating device; the shell is of a sealed shell structure, insulating gas is filled in the shell, and the first wall bushing and the second wall bushing are respectively arranged at two ends of the shell in a penetrating mode;
the first discharge gap piece is fixedly arranged at the end part of the extending end of the first wall bushing, the second discharge gap piece is fixedly arranged at the end part of the extending end of the second wall bushing, and a discharge gap is formed between the first discharge gap piece and the second discharge gap piece; the fan is arranged in the middle of the discharge gap, and an air outlet of the fan is arranged towards one side of the discharge gap; the plasma jet generating device is arranged at the air outlet of the fan and used for generating plasma jet.
Further, the plasma jet generating device comprises a grounding electrode plate, a high-voltage electrode plate, an insulating layer and a polytetrafluoroethylene tube; the polytetrafluoroethylene tube is arranged at the air outlet of the fan, an air channel is arranged in the polytetrafluoroethylene tube, and the inlet end of the air channel is communicated with the air outlet of the fan; the grounding electrode plate and the high-voltage electrode plate are coaxially arranged and are sequentially arranged at the outlet end of the gas channel; the centers of the grounding electrode plate and the high-voltage electrode plate are both provided with jet holes, and the insulating layer is arranged between the grounding electrode plate and the high-voltage electrode plate.
Further, the system also comprises a radio frequency power supply, a fan power supply and a control module; the output end of the radio frequency power supply is connected with the plasma jet generating device, and the output end of the fan power supply is connected with the fan; the output end of the control module is respectively connected with the radio frequency power supply and the fan power supply.
Furthermore, a fan power supply is connected with the fan through a fan power line, the fan power supply is arranged on the outer side of the shell, one end of the fan power line is connected with the fan power supply, and the other end of the fan power line penetrates through a sealing hole in the shell and then is connected with the fan;
the radio frequency power supply is connected with the plasma jet generating device through a plasma jet device cable, the radio frequency power supply is arranged on the outer side of the shell, one end of the plasma jet device cable is connected with the radio frequency power supply, and the other end of the plasma jet device cable penetrates through a sealing hole in the shell and then is connected with the plasma jet generating device.
Furthermore, the shell comprises a first end cover, a second end cover and a middle straight cylinder, the first end cover and the second end cover are respectively arranged at two ends of the middle straight cylinder in a sealing manner, and the first end cover, the second end cover and the middle straight cylinder form a sealed shell structure; the first wall bushing is arranged on the first end cover in a sealing and penetrating mode, and the second wall bushing is arranged on the second end cover in a sealing and penetrating mode.
Furthermore, the exposed end of the first wall bushing is connected with the lightning arrester, and the exposed end of the second wall bushing is grounded.
Further, the first discharge gap member adopts a rod gap or a ball gap, and the second discharge gap member adopts a rod gap or a ball gap.
Further, the insulating gas is nitrogen or SF6。
Furthermore, the gas channel adopts a horn-shaped gas channel, and the inlet end of the horn-shaped gas channel is a large end, and the outlet end of the horn-shaped gas channel is a small end.
Furthermore, the plasma jet generating device has a hyperbolic structure.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a totally-enclosed controllable transformer neutral point protection discharge gap, a plasma jet generating device and a fan are arranged in the middle of the discharge gap, and plasma jet is formed between the discharge gap by the plasma jet generating device and the fan; when the transformer is subjected to overvoltage and higher voltage appears at two ends of the discharge gap, the discharge gap is immediately conducted by utilizing the conductivity of the plasma jet; the two discharge gap pieces are arranged in the sealed shell structure, so that a discharge gap formed by the two discharge gap pieces is in a sealed environment, the breakdown of the discharge gap is not influenced by external environmental factors, the dispersity of the breakdown voltage of the discharge gap due to the change of the environmental factors is eliminated, the reliability of the neutral point protection discharge gap is effectively improved, and the discharge gap is prevented from being mistakenly moved under overvoltage and damaged by a transformer.
Furthermore, high voltage is generated between the grounding electrode plate and the high voltage electrode plate to break down insulating gas, so that gas molecules can be ionized in a short time to form plasma jet; through setting up ground connection electrode slice, high-voltage electrode slice and insulating layer at the exit end of gas channel, when only switching on fan power, only produce the air current between the discharge gap, avoided the puncture to the discharge gap, effectively improved the reliability of clearance structure.
Furthermore, the control module is arranged and connected with the radio frequency power supply and the fan power supply, and the control module is used for controlling the on-off of the radio frequency power supply and the fan power supply, so that the misoperation of a discharge gap is avoided, and the safety of the discharge gap is improved.
Furthermore, the shell is combined by two end covers and a middle straight cylinder, so that the structure is simple, and the structure is convenient to replace, inspect and maintain.
Further, an insulating gasUsing nitrogen or SF6The gas channel adopts a horn-shaped gas channel, and gas passes through the horn-shaped gas channel to generate high voltage between the cathode and the anode, so that insulating gas is punctured, plasma jet is formed, and the stability of the plasma jet is improved.
Further, input signals of the control module comprise on-off states of circuit breakers on the high-voltage side of a grounding main transformer in a station and voltage amplitude signals of a main transformer neutral point; when the overvoltage is detected to exceed the preset number of cycles, the overvoltage amplitude is greater than the steady-state voltage value of a single-phase grounding neutral point, and the circuit breakers on the high-voltage side of the main grounding transformer in the station are tripped, the neutral point is judged to lose the ground, the power frequency overvoltage or the temporary overvoltage occurs in the neutral point, the control module is connected with the ventilator power supply and the radio frequency power supply, the neutral point is conducted, and the neutral point arrester and the neutral point of the transformer are protected from being insulated; under the condition of lightning overvoltage, the duration of the overvoltage does not exceed the preset cycle number; when the neutral point is not grounded, the high-voltage side circuit breakers of the main transformer which is not grounded in the station are all tripped, the control modules are not connected with a radio frequency power supply, and the discharge gap cannot be mistakenly operated.
Drawings
Fig. 1 is a schematic structural view of a transformer neutral point protection discharge gap according to the present invention;
fig. 2 is a partially enlarged schematic view of the plasma jet generator of the present invention;
fig. 3 is an application structure diagram of the transformer neutral point protection discharge gap according to the present invention.
The plasma jet generator comprises a shell 1, a first discharge gap piece 2, a second discharge gap piece 3, a first wall bushing 4, a second wall bushing 5, a fan 6, a plasma jet generating device 7, a fixing support 8, a fan power line 9, a plasma jet device cable 10, a lightning arrester 11 and an isolation disconnecting link 12, wherein the shell is provided with a first discharge gap piece and a second discharge gap piece; 100 totally-enclosed controllable protection gaps; 101 a first end cover, 102 an end cover, 103 a middle straight cylinder; 71 ground electrode sheet, 72 high voltage electrode sheet, 73 insulating layer, 74 polytetrafluoroethylene tube, 75 gas channel.
Detailed Description
In order to make the technical problem solved by the present invention, technical solution and beneficial effect are more clearly understood, and the following specific embodiments are right for the present invention to proceed further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in the accompanying drawings 1-2, the utility model provides a totally-enclosed controllable transformer neutral point protection discharge gap, which comprises a shell 1, a first discharge gap piece 2, a second discharge gap piece 3, a first wall bushing 4, a second wall bushing 5, a fan 6, a plasma jet generating device 7, a fixed bracket 8, a fan power line 9, a plasma jet device cable 10, a radio frequency power supply, a fan power supply and a control module; the shell 1 is arranged on a fixed bracket 8, and the shell 1 is fixed on a base through the fixed bracket 8; the shell 1 is a sealed shell structure, and a sealed cavity is arranged in the shell 1; the shell 1 is filled with insulating gas to ensure that a neutral point protective discharge gap is in the insulating gas atmosphere; the first wall bushing 4 and the second wall bushing 5 are respectively arranged at two ends of the shell 1 in a penetrating way; one end of the first wall bushing 4 extends into the shell 1, and the other end is exposed; the first discharge gap piece 2 is fixedly arranged at the end part of the extending end of the first wall bushing 4, and the exposed end of the first wall bushing 4 is connected with the lightning arrester 11; one end of the second wall bushing 5 extends into the shell 1, and the other end is exposed; the second discharge gap piece 3 is fixedly arranged at the end part of the extending end of the first wall bushing 4, and the exposed end of the second wall bushing 4 is grounded; a discharge gap is formed between the first discharge gap member 2 and the second discharge gap member 3; the fan 6 is arranged below the middle part of the discharge gap, and the air outlet of the fan 4 is arranged towards one side of the discharge gap; the plasma jet generating device 7 is arranged at the air outlet of the fan 6, and the plasma jet generating device 7 is used for generating plasma jet.
The output end of the fan power supply is connected with the fan 6, and the fan power supply is connected with the fan 6 through a fan power line 9; the fan power supply is arranged on the outer side of the shell 1, one section of a fan power line 9 is connected with the fan power supply, and the other end of the fan power line penetrates through a sealing hole in the upper end of the shell 1 and then is connected with the fan 6.
The output end of the radio frequency power supply is connected with the plasma jet flow generating device 7, the radio frequency power supply is arranged on the outer side of the shell 1 and is connected with the plasma jet flow generating device 7 through a plasma jet flow device cable 10, one end of the plasma jet flow device cable 10 is connected with the radio frequency power supply, and the other end of the plasma jet flow device cable penetrates through a sealing hole in the shell 1 and is connected with the plasma jet flow generating device 7.
The output end of the control module is respectively connected with the radio frequency power supply and the fan power supply, the input end of the control module is connected with the high-voltage side circuit breaker of the in-station grounding main transformer and the main transformer neutral point, and the input signal of the control module comprises the on-off state of the high-voltage side circuit breaker of the in-station grounding main transformer and the voltage amplitude signal of the main transformer neutral point.
The shell 1 comprises a first end cover 101, a second end cover 102 and a middle straight cylinder 103, wherein the first end cover 101 and the second end cover 102 are respectively arranged at two ends of the middle straight cylinder 103 in a sealing manner, and the first end cover 101, the second end cover 102 and the middle straight cylinder 103 form a sealed shell structure; the first wall bushing 4 is hermetically arranged on the first end cover 101 in a penetrating way, and the second wall bushing 5 is hermetically arranged on the second end cover 102 in a penetrating way; the insulating gas in the housing 1 is nitrogen or SF6。
The utility model discloses in, first discharge gap spare 2 adopts stick clearance or ball clearance, and second discharge gap spare 3 adopts stick clearance or ball clearance.
The plasma jet generating device 7 comprises a grounding electrode plate 71, a high-voltage electrode plate 72, an insulating layer 73 and a polytetrafluoroethylene tube 74; the polytetrafluoroethylene tube 74 is arranged at the air outlet of the fan 6, an air channel 75 is arranged in the polytetrafluoroethylene tube 74, and the inlet end of the air channel 75 is communicated with the air outlet; the ground electrode plate 71 and the high-voltage electrode plate 72 are coaxially arranged and are sequentially arranged at the outlet end of the gas channel 75; jet holes are formed in the centers of the ground electrode plate 71 and the high-voltage electrode plate 72, and the insulating layer 73 is arranged between the ground electrode plate 71 and the high-voltage electrode plate 72; preferably, the outer shape structure of the plasma jet generating device 7 is a hyperbolic structure; the gas channel 75 is a trumpet-shaped gas channel, and the inlet end of the trumpet-shaped gas channel is a large end while the outlet end is a small end; high voltage is generated between the grounding electrode plate 71 and the high voltage electrode plate 72 through a radio frequency power supply, insulating gas is punctured, gas molecules can be ionized in a short time, and plasma jet is formed.
Working principle and using method
As shown in the attached figure 3, when the utility model is used, the totally closed controllable protection gap 100 is connected in parallel with the lightning arrester 11, and the totally closed controllable protection gap 100 is the totally closed controllable transformer neutral point protection discharge gap of the utility model; connecting a totally-enclosed protective gap 100 between the neutral point of the transformer and the ground, and arranging an isolating switch on the base and on the other side of the lightning arrester 11; the isolating switch is connected with an insulating support of the isolating switch 12, the switch of the isolating switch 12 is connected with a static contact of the isolating switch, and the top end of the lightning arrester 11 is connected with the isolating switch through a connecting bus bar so as to protect the neutral point insulation of the transformer and the neutral point lightning arrester.
The utility model discloses in, when taking in-station earthing main transformer high-voltage side circuit breaker on-off state and main transformer neutral point voltage amplitude signal as control module's input signal, when control module detects that overvoltage is long to exceed and predetermine the number cycle, and overvoltage amplitude is greater than single-phase ground neutral point steady state voltage value, and in-station earthing main transformer high-voltage side circuit breaker all jumps away, then judge to take place neutral point out of the earth, the neutral point appears power frequency overvoltage or temporary overvoltage, control module connects ventilation blower power and radio frequency power, utilize plasma jet generating device and fan to form plasma jet between the discharge gap, utilize plasma jet's electric conductivity, make the discharge gap switch on immediately, the neutral point switches on, it is insulating to protect neutral point arrester and transformer neutral point; under the condition of lightning overvoltage, the duration of the overvoltage does not meet the requirement that the overvoltage exceeds the preset number of cycles; when the neutral point is not grounded, the high-voltage side circuit breakers of the main transformer which is not grounded in the station are all tripped, the control modules are not connected with a radio frequency power supply, and the discharge gap cannot be mistakenly operated.
The utility model discloses a transformer neutral point protection discharge gap, the shell includes two end covers and a middle straight tube, the two end covers and the middle straight tube together form a sealed shell structure, and the inside of the sealed shell structure is filled with insulating gas; when the insulating gas is used, the volume of the cavity can be effectively reduced by increasing the pressure of the insulating gas; two ends of the shell are respectively provided with a wall bushing, one end of the wall bushing extends into the shell, and the other end of the wall bushing is exposed; the end part of the extending end of the wall bushing is provided with a discharge gap piece; the discharge gap parts at the two ends jointly form a discharge gap, and the discharge gap can adopt a rod-rod gap or a ball-ball gap; a fan and a plasma jet generating device are arranged below the middle of the discharge gap; the utility model discloses a set up the discharge gap in sealed shell structure, the breakdown in discharge gap does not receive external environmental factor influence, has eliminated the dispersion that protection discharge gap breakdown voltage appears because of environmental factor changes to and take place the risk of maloperation under thunder and lightning, operation overvoltage, improved the reliability in neutral point protection clearance, applicable in various complicated adverse circumstances such as plateau, sea.
Examples
The embodiment provides a totally-enclosed controllable transformer neutral point protection discharge gap, which comprises a shell 1, a first discharge gap piece 2, a second discharge gap piece 3, a first wall bushing 4, a second wall bushing 5, a fan 6, a plasma jet generating device 7, a fixed support 8, a fan power line 9, a plasma jet device power supply, a radio frequency power supply, a fan power supply and a control module.
The shell 1 comprises two end covers and a middle straight cylinder, the two end covers are respectively arranged at two ends of the middle straight cylinder in a sealing way, the end covers and the middle straight cylinder are spliced to form a sealed shell structure, and an inner cavity of the sealed shell structure is filled with insulating gas; the insulating gas is nitrogen or SF6(ii) a By increasing the pressure of the insulating gas in the housing 1, the volume of the cavity can be reduced.
The first wall bushing 4 and the second wall bushing 5 are respectively arranged on end covers at two sides of the shell 1 in a sealing and penetrating manner, a first discharge gap piece 2 is arranged at the end part of the first wall bushing 4 in the shell, and a second discharge gap piece 3 is arranged at the end part of the second wall bushing 5 in the shell; the first discharge gap member 2 and the second discharge gap member 3 form a discharge gap therebetween, and the discharge gap may be a rod-rod gap or a copper ball gap.
A fan 6 and a plasma jet generating device 7 are arranged below the middle part of the discharge gap, the fan 6 is arranged at the bottom of the inner side of the shell in the middle part of the discharge gap, and an air inlet channel is reserved between the fan 6 and the inner wall of the shell; the plasma jet generating device 7 is arranged above the fan 6, and an air outlet of the fan 6 is vertically arranged towards one side of the discharge gap; the plasma jet flow generating device 7 is arranged above the air outlet of the fan 6, and the appearance structure of the plasma jet flow generating device 7 is a hyperbolic structure, so that the strength and the stability of the structure are effectively improved.
The plasma jet generating device 7 comprises a grounding electrode plate 71, a high-voltage electrode plate 72, an insulating layer 73 and a polytetrafluoroethylene tube 74; the polytetrafluoroethylene tube 74 is arranged at the air outlet of the fan 6, an air channel 75 is arranged in the polytetrafluoroethylene tube 74, and the inlet end of the air channel 75 is communicated with the air outlet; the ground electrode plate 71 and the high-voltage electrode plate 72 are coaxially arranged and are sequentially arranged at the outlet end of the gas channel 75; preferably, the ground electrode plate 71 and the high-voltage electrode plate 72 are both metal electrode plates; jet holes are formed in the centers of the ground electrode plate 71 and the high-voltage electrode plate 72, and the insulating layer 73 is arranged between the ground electrode plate 71 and the high-voltage electrode plate 72; preferably, the outer shape structure of the plasma jet generating device 7 is a hyperbolic structure; the gas channel 75 is a trumpet-shaped gas channel, and the inlet end of the trumpet-shaped gas channel is a large end while the outlet end is a small end; high voltage is generated between the grounding electrode plate 71 and the high voltage electrode plate 72 through a radio frequency power supply, insulating gas is punctured, gas molecules can be ionized in a short time, and plasma jet is formed.
The output end of the fan power supply is connected with the fan 6, and the fan power supply is connected with the fan 6 through a fan power line 9; the fan power supply is arranged on the outer side of the shell 1, one section of a fan power line 9 is connected with the fan power supply, and the other end of the fan power line penetrates through a sealing hole in the upper end of the shell 1 and then is connected with the fan 6; the output end of the radio frequency power supply is connected with a plasma jet flow generating device 7, the radio frequency power supply is arranged on the outer side of the shell 1 and is connected with the plasma jet flow generating device 7 through a plasma jet flow device cable 10, one end of the plasma jet flow device cable 10 is connected with the radio frequency power supply, and the other end of the plasma jet flow device cable penetrates through a sealing hole in the shell 1 and is connected with the plasma jet flow generating device 7; the output end of the control module is respectively connected with a radio frequency power supply and a fan power supply, the input end of the control module is connected with a high-voltage side circuit breaker and a main transformer neutral point of an in-station grounding main transformer, and input signals of the control module comprise on-off states of the high-voltage side circuit breaker of the in-station grounding main transformer and voltage amplitude signals of the main transformer neutral point; the control module comprises a timing unit and a comparison unit.
In the embodiment, a fan power line 9 and a plasma jet device cable 10 both penetrate through a sealing hole at the bottom of the shell and are respectively connected with a fan power supply and a radio frequency power supply; the on-off of the fan power supply and the radio frequency power supply is controlled by the control module; when the control module is connected with a radio frequency power supply and a fan power supply, the insulating gas airflow passes through the gas channel at high speed after the fan is started, and the radio frequency high voltage is added between the grounding electrode plate and the high-voltage electrode plate at the same time, so that plasma jet can be ejected along with the insulating gas airflow; when the transformer is subjected to overvoltage and higher voltage appears at two ends of the discharge gap, the gap can be immediately broken down due to the conductivity of the plasma in cooperation with a proper discharge gap distance; the radio frequency power supply is switched off, only the fan power supply is switched on, only airflow is generated, and the gap cannot be punctured.
In the embodiment, the input signals of the control module comprise the on-off state of a circuit breaker on the high-voltage side of a grounding main transformer in a station and a voltage amplitude signal of a neutral point of a main transformer; when the overvoltage is detected to exceed 2 cycles, the overvoltage amplitude is larger than the steady-state voltage value of a single-phase grounding neutral point, and the circuit breakers on the high-voltage side of the main grounding transformer in the station are tripped, the neutral point is judged to lose the ground, and the power frequency overvoltage or the temporary overvoltage occurs in the neutral point; at the moment, the control module is connected with a ventilator power supply and a radio frequency power supply, the neutral point is conducted, and the neutral point lightning arrester and the neutral point of the transformer are protected from being insulated; under the condition of lightning overvoltage, the duration of the overvoltage does not meet the requirement of more than 2 cycles; when the neutral point is not grounded, the high-voltage side circuit breakers of the main transformer which is not grounded in the station are all tripped, the control modules are not connected with a radio frequency power supply, and the discharge gap cannot be mistakenly operated.
The utility model can overcome the influence of climate and environment factors on the gap discharge voltage, and can intelligently control the breakdown of the transformer neutral point protection gap according to the type of system overvoltage; the discharge gap is arranged in the shell, the breakdown of the neutral point protection gap of the transformer is not influenced by environmental factors, the dispersion of the breakdown voltage of the protection gap due to the change of the environmental factors and the risk of maloperation under lightning and over-voltage operation are eliminated, the reliability of the neutral point protection gap is improved, and the transformer is suitable for various complicated and severe environments such as plateaus, seas and the like.
The above embodiment is only one of the embodiments that can realize the technical solution of the present invention, and the scope of the present invention is not limited only by the embodiment, but also includes any variations, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. A totally-enclosed controllable transformer neutral point protection discharge gap is characterized by comprising a shell (1), a first discharge gap part (2), a second discharge gap part (3), a first wall bushing (4), a second wall bushing (5), a fan (6) and a plasma jet generating device (7); the shell (1) is of a sealed shell structure, insulating gas is filled in the shell (1), and a first wall bushing (4) and a second wall bushing (5) are respectively arranged at two ends of the shell (1) in a penetrating mode;
the first discharge gap piece (2) is fixedly arranged at the end part of the extending end of the first wall bushing (4), the second discharge gap piece (3) is fixedly arranged at the end part of the extending end of the second wall bushing (5), and a discharge gap is formed between the first discharge gap piece (2) and the second discharge gap piece (3); the fan (6) is arranged in the middle of the discharge gap, and an air outlet of the fan (6) is arranged towards one side of the discharge gap; the plasma jet generating device (7) is arranged at the air outlet of the fan (6), and the plasma jet generating device (7) is used for generating plasma jet.
2. A fully closed controllable transformer neutral point protection discharge gap according to claim 1, characterized in that the plasma jet generating device (7) comprises a grounding electrode plate (71), a high voltage electrode plate (72), an insulating layer (73) and a polytetrafluoroethylene tube (74); the polytetrafluoroethylene tube (74) is arranged at an air outlet of the fan (6), an air channel (75) is arranged in the polytetrafluoroethylene tube (74), and the inlet end of the air channel (75) is communicated with an air outlet of the fan (6); the grounding electrode plate (71) and the high-voltage electrode plate (72) are coaxially arranged and are sequentially arranged at the outlet end of the gas channel (75); jet holes are formed in the centers of the ground electrode plate (71) and the high-voltage electrode plate (72), and the insulating layer (73) is arranged between the ground electrode plate (71) and the high-voltage electrode plate (72).
3. The fully-closed controllable transformer neutral point protection discharge gap according to claim 2, further comprising a radio frequency power supply, a fan power supply and a control module; the output end of the radio frequency power supply is connected with the plasma jet generating device (7), and the output end of the fan power supply is connected with the fan (6); the output end of the control module is respectively connected with the radio frequency power supply and the fan power supply.
4. A fully-closed controllable transformer neutral point protection discharge gap according to claim 3, characterized in that a fan power supply is connected with the fan (6) through a fan power supply line (9), the fan power supply is arranged outside the casing (1), one end of the fan power supply line (9) is connected with the fan power supply, and the other end of the fan power supply line penetrates through a sealing hole on the casing (1) and then is connected with the fan (6);
the radio frequency power supply is connected with the plasma jet generating device (7) through a plasma jet device cable (10), the radio frequency power supply is arranged on the outer side of the shell (1), one end of the plasma jet device cable (10) is connected with the radio frequency power supply, and the other end of the plasma jet device cable penetrates through a sealing hole in the shell (1) and then is connected with the plasma jet generating device (7).
5. The fully-closed controllable transformer neutral point protection discharge gap according to claim 1, wherein the housing (1) comprises a first end cover (101), a second end cover (102) and a middle straight cylinder (103), the first end cover (101) and the second end cover (102) are respectively arranged at two ends of the middle straight cylinder (103) in a sealing manner, and the first end cover (101), the second end cover (102) and the middle straight cylinder (103) form a sealed shell structure; the first wall bushing (4) is arranged on the first end cover (101) in a sealing mode in a penetrating mode, and the second wall bushing (5) is arranged on the second end cover (102) in a sealing mode in a penetrating mode.
6. A fully closed controllable transformer neutral point protection discharge gap according to claim 1, characterized in that the exposed end of the first wall bushing (4) is connected to the lightning arrester (11) and the exposed end of the second wall bushing (5) is grounded.
7. A fully closed controllable transformer neutral point protection discharge gap according to claim 1, characterized in that the first discharge gap member (2) is rod gap or ball gap, and the second discharge gap member (3) is rod gap or ball gap.
8. A fully closed controllable transformer neutral point protective discharge gap as claimed in claim 1 wherein the insulating gas is nitrogen or SF6。
9. A fully closed controllable transformer neutral point protection discharge gap according to claim 2, characterized in that the gas channel (75) is a trumpet-shaped gas channel, the inlet end of which is the large end and the outlet end of which is the small end.
10. A fully closed controllable transformer neutral point protection discharge gap according to claim 3, characterized in that the plasma jet generating device (7) has a hyperbolic structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022696893.1U CN213401855U (en) | 2020-11-19 | 2020-11-19 | Totally-enclosed controllable transformer neutral point protection discharge gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022696893.1U CN213401855U (en) | 2020-11-19 | 2020-11-19 | Totally-enclosed controllable transformer neutral point protection discharge gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213401855U true CN213401855U (en) | 2021-06-08 |
Family
ID=76194775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022696893.1U Active CN213401855U (en) | 2020-11-19 | 2020-11-19 | Totally-enclosed controllable transformer neutral point protection discharge gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213401855U (en) |
-
2020
- 2020-11-19 CN CN202022696893.1U patent/CN213401855U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102486954B (en) | Multi-interspace self-expanding strong-airflow arc extinguishing lightning protection device | |
| CN101159368B (en) | Air blast arc-quenching lightning protection inter space device | |
| CN201478816U (en) | Air blowing and variable gap arc extinguishing lightning protection gap device | |
| CN102263376A (en) | Gas arc extinguishing apparatus | |
| CN112310814A (en) | Totally-enclosed controllable transformer neutral point protection discharge gap | |
| CN110829183A (en) | Lightning arrester for power transmission line | |
| Carsimamovic et al. | Very fast electromagnetic transients in air insulated substations and gas insulated substations due to disconnector switching | |
| CN101964520B (en) | Gas-blast arc extinction lightning protection gap for power equipment | |
| CN213401855U (en) | Totally-enclosed controllable transformer neutral point protection discharge gap | |
| CN210780092U (en) | Arc and harmonic elimination device | |
| CN201163703Y (en) | Strong gas flow arc extinguishing lightning protection clearance apparatus | |
| CN104868461A (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN102592757B (en) | Constraint space jet-stream wind arc extinguishing lightning protection clearance apparatus | |
| CN201018279Y (en) | Arc extinguishing and over-voltage protection device | |
| CN201066670Y (en) | Over-voltage protection device for neutral point of transformer | |
| CN116073274A (en) | Air type environment-friendly breaker cabinet | |
| CN102486956B (en) | Lightning protection device with combination of multigap driven arc extinguishing and driving arc extinguishing by multipoint strong airflow | |
| CN108521077A (en) | A kind of Penetrative lightning arrester | |
| CN204131115U (en) | Multifunctional comprehensive circuit protection device | |
| CN201733083U (en) | Gas blast arc-quenching lightning protection gap for electrical devices | |
| CA2778712C (en) | Surge arrester and gas-insulated electric apparatus | |
| CN108051675B (en) | High-altitude area 35kV and below live-line switching no-load line research method | |
| Niu et al. | Reliability Analysis of Pre-insertion Resistors for EHV/UHV SF6 Circuit Breakers | |
| CN213692671U (en) | High-voltage switch cabinet with high safety performance | |
| CN205945048U (en) | Three -phase combined type over -voltage protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |