CN207853450U - A kind of transformer neutral point ground protection switch - Google Patents
A kind of transformer neutral point ground protection switch Download PDFInfo
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- CN207853450U CN207853450U CN201820017644.5U CN201820017644U CN207853450U CN 207853450 U CN207853450 U CN 207853450U CN 201820017644 U CN201820017644 U CN 201820017644U CN 207853450 U CN207853450 U CN 207853450U
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- copper bar
- neutral point
- transformer neutral
- connect
- point ground
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Abstract
The utility model discloses a kind of transformer neutral point ground protection switches; including inlet wire insulated terminal and outlet insulated terminal; the inlet wire insulated terminal is connect with upper copper bar; outlet insulated terminal is connect with lower copper bar; upper copper bar is respectively connected to the upper and lower side of switch core component with lower copper bar; the drive component that the switch core component includes operating mechanism, is connect with operating mechanism, the vacuum interrupter being connect with drive component, the lower copper bar are connected to the lower end of vacuum interrupter；Transformer neutral point being connect with earth conductor into and out of line insulator through this switch realizes high current effective grounding；Combined floodgate and separating brake are controlled by switch core component.
Description
Technical field
The utility model is related to high-voltage power distribution equipment fields more particularly to a kind of transformer neutral point ground protection to switch.
Background technology
The electric system of China 110kV and above belongs to effectively earthed system, a portion transformer
Neutral-point solid ground, while in order to limit single-phase-to-ground current, preventing from communicating interference to substation and meet relay protection
Demand, a part of transformer neutral point is earth-free.And the transformer neutral point generally use graded insulation knot that China is now run
Structure, its main feature is that the dielectric level of neutral point is less than the dielectric level of three-phase end line voltage grade.In some transformers
Property point ground connection power grid in, ground short circuit failure is relatively conventional failure, when system is struck by lightning or is occurred earth fault,
After the transformer tripping of neutral ground, power grid will become isolated neutral system, and the raising of power grid residual voltage causes earth-free
Transformer neutral point constitutes a threat to the insulation of neutral point by overvoltage, it is therefore necessary to which introducing protection equipment prevents failure from sending out
It is raw.
Currently, the protected mode of existing transformer neutral point protection equipment mainly has gap protection, setting to keep away in the market
Thunder device, arrester parallel connection gaps, through low reactance ground connection the methods of.But neutral protective scheme used at present all has difference
Defect：1) equipment for using gap separately protected, the horizon bar gap of electric discharge is exposed in air, is easy by humidity, dirt
The influence of the factors such as dirty, galvano-cautery or chemistry, defencive function decline or ineffective, discharge dispersity is big, and power frequency continued flow is larger,
Arc extinguishing ability is poor.2) equipment for using arrester separately protected, cannot protect power-frequency overvoltage, and in higher power frequency mistake
Itself need to protect under voltage, there are Failure risks for itself, in addition also need periodical power failure carry out preventive trial, maintenance workload compared with
Big and influence system reliability.3) gap and arrester mating protection are used, but in operation of power networks, by it is extraneous or system because
Element influences, and systematic parameter changes constantly, increases the cooperation difficulty when arrester and parallel connection gaps.It is improper to match, gap
Mistakenly hit is worn, and transformer trips, and leads to massive blackout, and gap tripping, then leads to Explosion of on Arrester and apparatus insulated damage
It is bad, it is also possible to crisis personal safety；It, can only switching transformer in the non-loaded state and because disconnecting switch is without arc extinguishing ability
Earthing mode.4) small reactor earthing mode is used, the requirement according to power grid to Zero-Sequence Impedance of Transformer is needed to set every
The reactance value of equipment, to achieve the purpose that limit single-phase short circuit current.The difficulty of design is increased, and when power grid is to transformer
When zero sequence impedance changes, former reactor complexes may not only increase workload, but also cause resource with regard to needing to change
Waste.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of can be switched and is grounded and earth-free two kinds
The transformer that the method for operation, the requirement for reducing transformer neutral point dielectric level, protection neutral point insulation preserve from is neutral
Point ground protection switch.
To achieve the goals above, the technical solution adopted in the utility model is：
A kind of transformer neutral point ground protection switch, including inlet wire insulated terminal and outlet insulated terminal, the inlet wire
Insulated terminal is connect with upper copper bar, and outlet insulated terminal is connect with lower copper bar, and upper copper bar is respectively connected to switch core with lower copper bar
The upper and lower side of heart component, the switch core component includes operating mechanism, the drive component that is connect with operating mechanism, with driving group
The vacuum interrupter of part connection, the lower copper bar are connected to the lower end of vacuum interrupter.
As being further improved for said program, drive component includes the shaft being connect with operating mechanism, and the shaft is logical
Supporting rack is crossed between fixed frame, the cam rotated coaxially is arranged in shaft, guide groove is offered on the cam, it is described
Activity is equipped with drive rod in guide groove, and the drive rod is connected with spring, and the spring is connected with connecting rod, the connecting rod and upper copper
Row's connection.
As being further improved for said program, the guide groove is arranged along the protrusion side of cam, protrusion side one end of cam
High one end is low.
As being further improved for said program, the upper copper bar, lower copper bar and drive component are sealingly mounted in gas tank,
The operating mechanism is fixed on outside gas tank.
As being further improved for said program, explosion-protection equipment is provided in the gas tank.
As being further improved for said program, the control loop of the operating mechanism is electrically connected with connecting terminal and low
Voltage electrical element, the connecting terminal and low-voltage electrical element are arranged in secondary small case.
As being further improved for said program, the secondary small case is fixed on the lower end of gas tank.
The beneficial effects of the utility model：
A kind of the utility model transformer neutral point ground protection switch, transformer neutral point through this switch into and out of line
Insulator is connect with earth conductor, realizes high current effective grounding；It is controlled and is closed a floodgate and separating brake by switch core component, when combined floodgate
Transformer neutral point ground connection operation, when singlephase earth fault occurs for system, transformer neutral point voltage will not increase, reduction pair
The production cost for wanting summation device of transformer neutral point dielectric level；Transformer neutral point, which connects, when separating brake does not run, when being
When singlephase earth fault occurs for system, single-phase-to-ground current is limited, reduces the interference to communication；By tranformer protection terminal, soon
Speed excision failure phase, non-faulting mutually still can normal operation, reduce scope of power outage.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described.Obviously, described attached drawing is a part of the embodiment of the utility model, rather than complete
Portion's embodiment, those skilled in the art without creative efforts, can also be obtained according to these attached drawings
Other design schemes and attached drawing：
Fig. 1 is the utility model preferred embodiment structural schematic diagram；
Fig. 2 is the front view of switch core component when the utility model preferred embodiment is closed a floodgate；
The front view of switch core component when Fig. 3 is the utility model preferred embodiment separating brake；
Fig. 4 is the right view of the utility model preferred embodiment switch core component.
Specific implementation mode
The technique effect of the design of the utility model, concrete structure and generation is carried out below with reference to embodiment and attached drawing
It clearly and completely describes, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
The other embodiment that art personnel are obtained without creative efforts belongs to the model of the utility model protection
It encloses.
Referring to figs. 1 to Fig. 4, a kind of transformer neutral point ground protection switch, including inlet wire insulated terminal 101 and outlet it is exhausted
Acies 102, the inlet wire insulated terminal 101 are connect with upper copper bar 104, and outlet insulated terminal 102 is connect with lower copper bar 108,
Upper copper bar 104 is respectively connected to the upper and lower side of switch core component with lower copper bar 108, and the switch core component includes operation machine
Structure 111, the drive component being connect with operating mechanism 111, the vacuum interrupter 107 being connect with drive component, the lower copper bar 108
It is connected to the lower end of vacuum interrupter 107.
The short circuit current nargin that vacuum interrupter 107 can be born is larger, even if the load of later stage transformer increases, as long as right
Earth fault electric current is no more than the rated value of the present apparatus, can work normally, and without needing to change, vacuum interrupter 107 selects epoxy glass
Fine plate is made, and is fixed by structures such as hollow out, combination-inlayings, while meeting creepage distance requirement.Vacuum interrupter 107 is to open
Break/close element, using its it is good cut-off and making capability, to cut-off/close fault current in transformer grounding circuit.It opens
The power output of core component transmission operating mechanism 111 is closed to 107 vacuum interrupters, realizes the function of closing with drop-out current.
Drive component includes the shaft 112 being connect with operating mechanism, and the shaft 112 is mounted on solid by supporting rack 113
Between determining frame 106, it is arranged with the cam 114 rotated coaxially in shaft 112, guide groove 115 is offered on the cam 114, it is described
Guide groove 115 is arranged along the protrusion side of cam 114, and the protrusion side higher end of cam 114 is low.
Activity is equipped with drive rod 116 in the guide groove 115, and the drive rod 116 is connected with spring 117, the spring
117 are connected with connecting rod 118, and the connecting rod 118 is connect with upper copper bar 104.
Operating mechanism can manually or electrically energy storage, drive rotating shaft 112 to rotate when running, shaft 112 is with moving cam 114
Rotation, lower end is moved to when the protrusion side of cam 114 is high-end so that drive rod 116 moves downward, and drives spring 117 and connecting rod
118 downwards, press copper bar 104 so that vacuum interrupter 107 closes, and realizes and closes a floodgate.When cam 114 turn to protrusion side it is low
End motion to bottom, drive rod 116 moves upwards, and drives spring 117 and connecting rod 118 upward, copper bar 104 in pulling so that
Vacuum interrupter 107 disconnects, and realizes separating brake.
The upper copper bar 104, lower copper bar 108 and drive component are sealingly mounted in gas tank 103, and gas tank 103 uses thickness not
Rust steel is welded, and meets IP67 grades, ensures that internal switch core is free from the influence of the external environment, using air insulation, no
It is only environmentally friendly, and be not easy to be influenced by outside environmental elements, non-maintaining, more reliable performance is realized within the service life time limit.Institute
It states operating mechanism 111 to be fixed on outside gas tank 103, explosion-protection equipment 109 is provided in the gas tank 103, when unit exception operation is led
When pressure abruptly increase is more than design value in cause gas tank 103, explosion-protection equipment 109 can be washed open and be oriented pressure release automatically, to ensure personnel
With the safety of equipment.
The control loop of the operating mechanism 111 is electrically connected with connecting terminal and low-voltage electrical element, the terminals
Son and low-voltage electrical element are arranged in secondary small case 110.The secondary small case 110 is fixed on the lower end of gas tank 103, secondary small
Case 110 acquires coherent signal voltage, electric current, realizes the functions such as automatic instruction, control, monitoring and protection, execute point/close a floodgate behaviour
Make.
Inlet wire insulated terminal 101, outlet insulated terminal 102 of the transformer neutral point through this switch are connect with earth conductor,
Realize high current effective grounding.This protection switch structure can be individually used in transformer neutral point earth-return circuit, without with
Other protective device cooperations, avoid the generation because of accidents such as transformer mistrip/trippings that a variety of device mismatees are brought.
When earth fault occurs for Repair of Transformer, normal operation or place system, can be controlled as desired by a distant place or on the spot
Operating mechanism carrys out the neutral grounding mode of switching transformer, and switching mode is flexible.
Controlled and closed a floodgate and separating brake by switch core component, when combined floodgate transformer neutral ground run, when system occurs
When singlephase earth fault, transformer neutral point voltage will not increase, and reduce the requirement to transformer neutral point dielectric level and set
Standby production cost；Transformer neutral point, which connects, when separating brake does not run, and when singlephase earth fault occurs for system, limitation is single-phase to be connect
Earth-current reduces the interference to communication；By tranformer protection terminal, failure phase is quickly cut off, non-faulting mutually still can be transported normally
Row reduces scope of power outage.
This protection switch also has the function of heavy separating brake, is mainly used for the transformer of isolated neutral operation.System is normal
When operation, this switch is in gate-dividing state, and when singlephase earth fault occurs for system, the present apparatus is closed a floodgate, and is closed in earth-return circuit
The fault current of generation, transformer neutral point is grounded, and is made its ground connection operation, is wanted to the dielectric level of neutral point to reduce
It asks, can be very good protection neutral point insulation and preserve from, but since single-phase short circuit current is very big, be easy to cause the master of transformer
Trip caused power failure occurs for switch, thus need to after of short duration time interval present apparatus separating brake again, cut-off the event in earth-return circuit
Hinder electric current (if having), if non-permanent earth fault, then weighs separating brake success, transformer is allowed to be in the operation of isolated neutral
State improves the reliability of system power supply；If permanent earth fault, then close a floodgate again, the action of transformer main switch, excision
Failure.Perfection inherits the advantages of earth neutral system and isolated neutral system.
It is to be illustrated to the preferred embodiment of the utility model, but the utility model creation is not limited to above
The embodiment, those skilled in the art can also make various etc. without departing from the spirit of the present invention
With modification or replacement, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (7)
1. a kind of transformer neutral point ground protection switch, it is characterised in that：It insulate including inlet wire insulated terminal (101) and outlet
Terminal (102), the inlet wire insulated terminal (101) connect with upper copper bar (104), outlet insulated terminal (102) and lower copper bar
(108) it connects, upper copper bar (104) is respectively connected to the upper and lower side of switch core component, the switch core with lower copper bar (108)
The drive component that component includes operating mechanism (111), is connect with operating mechanism (111), the vacuum extinction being connect with drive component
Room (107), the lower copper bar (108) are connected to the lower end of vacuum interrupter (107).
2. transformer neutral point ground protection switch according to claim 1, it is characterised in that：Drive component includes and behaviour
Make mechanism connection shaft (112), the shaft (112) by supporting rack (113) be mounted on fixed frame (106) between, shaft
(112) it is arranged with the cam (114) rotated coaxially on, guide groove (115), the guide groove (115) are offered on the cam (114)
Interior activity is equipped with drive rod (116), and the drive rod (116) is connected with spring (117), and the spring (117) is connected with
Bar (118), the connecting rod (118) connect with upper copper bar (104).
3. transformer neutral point ground protection switch according to claim 2, it is characterised in that：Guide groove (115) edge
The protrusion side of cam (114) is arranged, and the protrusion side higher end of cam (114) is low.
4. transformer neutral point ground protection switch according to claim 1, it is characterised in that：The upper copper bar (104),
Lower copper bar (108) is sealingly mounted at drive component in gas tank (103), and the operating mechanism (111) is fixed on gas tank (103)
Outside.
5. transformer neutral point ground protection switch according to claim 4, it is characterised in that：In the gas tank (103)
It is provided with explosion-protection equipment (109).
6. transformer neutral point ground protection switch according to claim 4, it is characterised in that：The operating mechanism
(111) control loop is electrically connected with connecting terminal and low-voltage electrical element, and the connecting terminal and low-voltage electrical element are set
It sets in secondary small case (110).
7. transformer neutral point ground protection switch according to claim 6, it is characterised in that：The secondary small case
(110) it is fixed on the lower end of gas tank (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820017644.5U CN207853450U (en) | 2018-01-03 | 2018-01-03 | A kind of transformer neutral point ground protection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820017644.5U CN207853450U (en) | 2018-01-03 | 2018-01-03 | A kind of transformer neutral point ground protection switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207853450U true CN207853450U (en) | 2018-09-11 |
Family
ID=63417246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820017644.5U Active CN207853450U (en) | 2018-01-03 | 2018-01-03 | A kind of transformer neutral point ground protection switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207853450U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599102A (en) * | 2018-01-03 | 2018-09-28 | 长园电力技术有限公司 | A kind of transformer neutral point ground protection switch |
| CN113066646A (en) * | 2021-03-09 | 2021-07-02 | 国网浙江省电力有限公司湖州供电公司 | 110kV transformer neutral point vacuum gap grounding complete equipment |
-
2018
- 2018-01-03 CN CN201820017644.5U patent/CN207853450U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599102A (en) * | 2018-01-03 | 2018-09-28 | 长园电力技术有限公司 | A kind of transformer neutral point ground protection switch |
| CN113066646A (en) * | 2021-03-09 | 2021-07-02 | 国网浙江省电力有限公司湖州供电公司 | 110kV transformer neutral point vacuum gap grounding complete equipment |
| CN113066646B (en) * | 2021-03-09 | 2023-09-29 | 国网浙江省电力有限公司湖州供电公司 | Vacuum gap grounding complete equipment for neutral point of 110kV transformer |
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