CN217135149U - Transformer neutral point grounding protection device - Google Patents
Transformer neutral point grounding protection device Download PDFInfo
- Publication number
- CN217135149U CN217135149U CN202220727690.0U CN202220727690U CN217135149U CN 217135149 U CN217135149 U CN 217135149U CN 202220727690 U CN202220727690 U CN 202220727690U CN 217135149 U CN217135149 U CN 217135149U
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- rod
- discharge gap
- transformer
- 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
- 230000007935 neutral effect Effects 0.000 title claims abstract description 54
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 7
- 230000001052 transient effect Effects 0.000 description 5
- 208000025274 Lightning injury Diseases 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a transformer neutral point grounding protection device relates to power equipment technical field, which comprises a support, a plurality of earthing pole of support top left side fixedly connected with, earthing pole top fixedly connected with discharge gap component, fixedly connected with pole setting in the middle of the discharge gap component top, the first discharge gap pole of right fixedly connected with in pole setting top, first discharge gap pole right-hand member fixedly connected with guide pillar, the first current transformer of fixedly connected with in the middle of the support upper surface, first current transformer top fixedly connected with current conducting plate, current conducting plate left side fixedly connected with second discharge gap pole, second discharge gap pole left end fixedly connected with discharge pole, support upper surface right side fixedly connected with terraced platform, terraced platform top fixedly connected with triangular platform. The utility model discloses a set up discharge gap component, first current transformer and neutral point lightning rod for the high voltage influence that the transformer received alleviates to the minimum.
Description
Technical Field
The utility model relates to a power equipment technical field specifically relates to a transformer neutral point protection device that connects to ground.
Background
A power transformer is a stationary electrical device that is used to transform an ac voltage (current) of a certain value into another voltage (current) of the same frequency or different values. Stationary devices with two or more windings convert alternating voltages and currents of one system into voltages and currents of another system by electromagnetic induction at the same frequency for the transmission of electrical energy, usually with different values.
In an electric power system, two different operation modes of neutral point grounding or non-grounding need to be realized for transformers in effective grounding systems of 110kV, 220kV and 330kV, otherwise, the voltage rise of the neutral point of the transformer caused by lightning impulse and faults and the damage to the insulation of the transformer cannot be avoided, the transformer needs to be protected, and otherwise, the voltage rise of the neutral point of the transformer can cause the damage to the transformer. In order to solve the above problems, it is necessary to provide a transformer neutral grounding protection device.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the technical scheme provides a transformer neutral point grounding protection device, and solves the problems that the transformer provided in the background art needs to realize two different operation modes of neutral point grounding or ungrounded, otherwise, the transformer neutral point cannot be protected due to voltage rise caused by lightning impulse and fault and damage to transformer insulation, and otherwise, the transformer neutral point voltage rise can cause damage to the transformer.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a transformer neutral point grounding protection device comprises a support, wherein the left side of the top of the support is fixedly connected with a plurality of grounding columns, the tops of the grounding columns are fixedly connected with a discharge gap element, the middle of the top of the discharge gap element is fixedly connected with a vertical rod, the top of the vertical rod is fixedly connected with a first discharge gap rod towards the right, the right end of the first discharge gap rod is fixedly connected with a guide column, the middle of the upper surface of the support is fixedly connected with a first current transformer, the top of the first current transformer is fixedly connected with a current conducting plate, the left side of the first current transformer is fixedly connected with a second discharge gap rod, the left end of the second discharge gap rod is fixedly connected with a discharge rod, the right side of the upper surface of the support is fixedly connected with a ladder platform, the top of the ladder platform is fixedly connected with a triangular platform, the top of the triangular platform is fixedly connected with a neutral point lightning arrester, the top of the neutral point lightning arrester is fixedly connected with a neutral point, and the right side of the triangular platform is fixedly connected with a second current transformer, the upper side of the end part of the second current transformer is fixedly connected with a conducting rod, the top end of the conducting rod is fixedly connected with a single-phase isolating switch, the left side of the single-phase isolating switch is fixedly connected with a connecting rod, and the left end of the connecting rod is fixedly connected to the top end of the neutral point lightning arrester.
Preferably, a gap exists between the guide post and the discharge rod, and the guide post and the discharge rod are collinear.
Preferably, the lower side of the right end of the second current transformer is fixedly connected with a grounding wire, and one end of the grounding wire, which is far away from the second current transformer, is fixedly connected to the end part of the support.
Preferably, a serial line is fixedly connected at the joint of the neutral point lightning rod and the neutral point lightning arrester, and the left end of the serial line is fixedly connected to the right side of the conductive plate.
Preferably, the second current transformer is perpendicular to the side surface of the triangular table.
Preferably, the height of the top end of the vertical rod is consistent with that of the top end of the first current transformer.
Preferably, a plurality of the ground studs are arranged at equal intervals along the circumference of the discharge gap member.
Compared with the prior art, the utility model provides a transformer neutral point ground protection device possesses following beneficial effect:
the single-phase isolating switch realizes two different operation modes of neutral point grounding or ungrounded by arranging the discharge gap element, the first current transformer, the second current transformer, the single-phase isolating switch and the neutral point lightning rod, and the device utilizes the discharge time delay of gap discharge and the characteristic of no discharge time delay of the metal oxide lightning arrester, so that the neutral point lightning arrester and the neutral point lightning rod act under high-frequency transient overvoltage (lightning overvoltage and operation harmonic overvoltage), and the discharge gap element does not act; under power frequency overvoltage (single-phase grounding overvoltage), the discharge gap element acts to realize rapid protection, so that high-frequency transient overvoltage and power frequency overvoltage encountered by the transformer when in work are respectively protected, the influence of high voltage on a neutral point of the transformer is reduced to the minimum, and the transformer can operate normally for a longer time.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the figures are:
101. a first discharge gap bar; 102. erecting a rod; 103. a discharge gap element; 104. a ground post; 105. a guide post; 106. a second discharge gap rod; 107. a series line; 108. a discharge rod; 109. a conductive plate; 110. a support; 111. a first current transformer;
201. a neutral point lightning rod; 202. a connecting rod; 203. a single phase isolating switch; 204. a conductive rod; 205. a ground line; 206. a second current transformer; 207. a triangular table; 208. a landing; 209. a neutral point arrester.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, a transformer neutral point grounding protection device comprises a support 110, a plurality of grounding columns 104 are fixedly connected to the left side of the top of the support 110, a discharge gap element 103 is fixedly connected to the top of the grounding columns 104, a vertical rod 102 is fixedly connected to the middle of the top of the discharge gap element 103, a first discharge gap rod 101 is fixedly connected to the right side of the top of the vertical rod 102, a guide post 105 is fixedly connected to the right end of the first discharge gap rod 101, a first current transformer 111 is fixedly connected to the middle of the upper surface of the support 110, a conductive plate 109 is fixedly connected to the top of the first current transformer 111, a second discharge gap rod 106 is fixedly connected to the left side of the conductive plate 109, a discharge rod 108 is fixedly connected to the left end of the second discharge gap rod 106, a step 208 is fixedly connected to the right side of the upper surface of the support 110, a triangular step 207 is fixedly connected to the top of the step 208, and a neutral point lightning arrester 209 is fixedly connected to the top of the triangular step 207, the top end of the neutral point lightning arrester 209 is fixedly connected with a neutral point lightning rod 201, the right side of the triangular platform 207 is fixedly connected with a second current transformer 206, the upper side of the end part of the second current transformer 206 is fixedly connected with a conducting rod 204, the top end of the conducting rod 204 is fixedly connected with a single-phase isolating switch 203, the left side of the single-phase isolating switch 203 is fixedly connected with a connecting rod 202, and the left end of the connecting rod 202 is fixedly connected with the top end of the neutral point lightning arrester 209;
referring to fig. 1, the triangular table 207 is insulated, and the grounding performance of the device can be controlled by controlling the single-phase isolating switch 203;
when high-frequency transient overvoltage passes through the transformer, such as lightning overvoltage and the like, at the moment, the voltage of the lightning stroke enters the neutral point lightning arrester 209 from the neutral point lightning rod 201, and the neutral point lightning arrester 209 carries out lightning protection on the lightning stroke;
when power frequency overvoltage acts, namely single-phase grounding overvoltage, the power frequency overvoltage passes through the second discharge gap rod 106, is transmitted to the first discharge gap rod 101 from a gap between the second discharge gap rod 106 and the first discharge gap rod 101, and is further transmitted to the discharge gap element 103 for discharging, so that protection is realized.
Specifically, a gap exists between the guide post 105 and the discharge rod 108, and the guide post 105 and the discharge rod 108 are collinear.
A grounding wire 205 is fixedly connected to the lower side of the right end of the second current transformer 206, and one end of the grounding wire 205 far away from the second current transformer 206 is fixedly connected to the end of the support 110.
A serial line 107 is fixedly connected to a junction between the neutral point lightning rod 201 and the neutral point lightning arrester 209, and the left end of the serial line 107 is fixedly connected to the right side of the conductive plate 109.
The second current transformer 206 is perpendicular to the side of the triangular table 207.
The top height of the vertical rod 102 is the same as the top height of the first current transformer 111.
A plurality of the ground studs 104 are arranged at equal intervals along the circumference of the discharge gap element 103.
The utility model discloses a theory of operation and use flow: by arranging the discharge gap element 103, the first current transformer 111, the second current transformer 206 and the neutral point lightning rod 201, the characteristics of discharge time delay of gap discharge and no discharge time delay of a metal oxide lightning arrester are utilized, so that the neutral point lightning arrester 209 and the neutral point lightning rod 201 act under high-frequency transient overvoltage (lightning overvoltage and operation harmonic overvoltage), and the discharge gap element 103 does not act; under power frequency overvoltage (single-phase grounding overvoltage), the discharge gap element 103 acts to realize rapid protection, so that high-frequency transient overvoltage and power frequency overvoltage encountered by the transformer during working are respectively protected, the influence of the high voltage on the transformer is reduced to the minimum, and the transformer can operate normally for a longer time.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A transformer neutral point grounding protection device is characterized by comprising a support (110), wherein a plurality of grounding columns (104) are fixedly connected to the left side of the top of the support (110), a discharge gap element (103) is fixedly connected to the top of each grounding column (104), an upright rod (102) is fixedly connected to the middle of the top of the discharge gap element (103), a first discharge gap rod (101) is fixedly connected to the right side of the top of the upright rod (102), a guide pillar (105) is fixedly connected to the right end of the first discharge gap rod (101), a first current transformer (111) is fixedly connected to the middle of the upper surface of the support (110), a conductive plate (109) is fixedly connected to the top of the first current transformer (111), a second discharge gap rod (106) is fixedly connected to the left side of the conductive plate (109), a discharge rod (108) is fixedly connected to the left end of the second discharge gap rod (106), and a step table (208) is fixedly connected to the right side of the upper surface of the support (110), terraced platform (208) top fixedly connected with triangular platform (207), triangular platform (207) top fixedly connected with neutral point arrester (209), neutral point arrester (209) top fixedly connected with neutral point lightning rod (201), triangular platform (207) right side fixedly connected with second current transformer (206), second current transformer (206) tip upside fixedly connected with conducting rod (204), single isolated switch (203) of conducting rod (204) top fixedly connected with, single isolated switch (203) left side fixedly connected with connecting rod (202), connecting rod (202) left end fixed connection is on neutral point arrester (209) top.
2. A transformer neutral grounding protection device according to claim 1, wherein: a gap exists between the guide post (105) and the discharge rod (108), and the guide post (105) and the discharge rod (108) are collinear.
3. A transformer neutral grounding protection device according to claim 1, wherein: and a grounding wire (205) is fixedly connected to the lower side of the right end of the second current transformer (206), and one end, far away from the second current transformer (206), of the grounding wire (205) is fixedly connected to the end of the support (110).
4. A transformer neutral grounding protection device according to claim 1, wherein: the junction of the neutral point lightning rod (201) and the neutral point lightning arrester (209) is fixedly connected with a series connection line (107), and the left end of the series connection line (107) is fixedly connected to the right side of the conducting plate (109).
5. A transformer neutral grounding protection device according to claim 1, wherein: the second current transformer (206) is perpendicular to the side surface of the triangular table (207).
6. A transformer neutral grounding protection device according to claim 1, wherein: the top height of the vertical rod (102) is consistent with that of the first current transformer (111).
7. A transformer neutral grounding protection device according to claim 1, wherein: the plurality of ground posts (104) are arranged at equal intervals along the circumference of the discharge gap element (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727690.0U CN217135149U (en) | 2022-03-28 | 2022-03-28 | Transformer neutral point grounding protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727690.0U CN217135149U (en) | 2022-03-28 | 2022-03-28 | Transformer neutral point grounding protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217135149U true CN217135149U (en) | 2022-08-05 |
Family
ID=82645795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220727690.0U Active CN217135149U (en) | 2022-03-28 | 2022-03-28 | Transformer neutral point grounding protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217135149U (en) |
-
2022
- 2022-03-28 CN CN202220727690.0U patent/CN217135149U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bucher et al. | Comparison of fault currents in multiterminal HVDC grids with different grounding schemes | |
| CN108493634B (en) | A Grounding Device for Suppressing Electromagnetic Disturbance | |
| CN102684127B (en) | Mobile alternating-current ice melting device for power transmission line | |
| CN201608508U (en) | Transformer neutral point rod gap protection device | |
| CN203180518U (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN217135149U (en) | Transformer neutral point grounding protection device | |
| CN112364539B (en) | Current limiter for high-coupling split reactor and its structural layout design method and device | |
| CN104868461A (en) | Intelligent switch arc-extinguishing and overvoltage-protecting device | |
| CN110535089A (en) | Laying method and device for indirect grounding of lightning protection wires in distribution network | |
| CN103490384B (en) | Multi-generator ship intermediate voltage electric power system protection method and device | |
| CN102570482A (en) | High voltage parallel capacitor device based on neutral point direct grounding mode | |
| CN105186434A (en) | Multifunctional intelligent comprehensive lightning protection system for distribution network | |
| CN106921152A (en) | A kind of induction reactance earthing or grounding means high of the generator neutral point with secondary induction reactance shorting switch | |
| CN205304172U (en) | Room outer door type high voltage power distribution device | |
| Khademlahashy et al. | Impact of using current limiting reactor on the existing circuit breakers in micro-grids | |
| CN107241084A (en) | A kind of wide heavy current pulse power source device of long pulse of the equal current transformer of band | |
| CN101593974A (en) | Compound overvoltage protection device and the application in the semiconductor variable flow device thereof | |
| CN201465687U (en) | Composite over-voltage protector and device thereof | |
| CN220138085U (en) | Three-phase double-winding transformer inlet wire arrangement structure | |
| CN209881406U (en) | Improved transformer neutral point complete device | |
| RU2767312C1 (en) | Universal device for protection against internal overvoltages and partial compensation of reactive power (extinguisher-compensator) | |
| CN205945048U (en) | Three -phase combined type over -voltage protector | |
| CN221508770U (en) | Insulating tube female mounting structure | |
| Rudse et al. | Protection oi rotating AC machines against traveling wave voltages | |
| CN219477255U (en) | Connection mode of grounding transformer and neutral point resistor cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |