CN108767839A - A kind of overvoltage protection - Google Patents
A kind of overvoltage protection Download PDFInfo
- Publication number
- CN108767839A CN108767839A CN201810527264.0A CN201810527264A CN108767839A CN 108767839 A CN108767839 A CN 108767839A CN 201810527264 A CN201810527264 A CN 201810527264A CN 108767839 A CN108767839 A CN 108767839A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- end cover
- pole
- overvoltage protection
- bottom end
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
-
- 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
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
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- Testing Relating To Insulation (AREA)
Abstract
A kind of overvoltage protection; including plexiglass cylinder; it is provided with stainless steel upper end cover at the top of plexiglass cylinder; plexiglass cylinder bottom is provided with stainless steel bottom end cover; plexiglass cylinder, stainless steel upper end cover and stainless steel bottom end cover form cylindrical seal chamber, fill SF in cylindrical seal chamber6Gas；Stainless steel pole is provided on stainless steel upper end cover; the end set of upper stainless steel pole has top electrode; stainless steel pole under being provided centrally with of stainless steel bottom end cover; the end set of lower stainless steel pole has lower electrode; top electrode and lower electrode are oppositely arranged, and top electrode and lower electrode form portable protective gaps.The invention avoids external environment influence, Stability and dependability is enhanced, and is convenient for execute-in-place.Discharge voltage can be adjusted by air pressure in the present invention, can also be adjusted by clearance distance, flexibility greatly enhances.
Description
Technical field
The invention belongs to high-voltage test techniques fields, and in particular to a kind of overvoltage protection.
Background technology
High-voltage test techniques are the research techniques by high-voltage technology, and the insulation for solving high-tension transmission engineering is asked
Topic, belongs to an important branch subject of power engineering.Power equipment production phase, scene handing-over and operating maintenance process
In, the means with high-voltage test are required to, its dielectric strength and other crucial electric properties are verified.Type including equipment
Formula experiment, delivery test, live commissioning test, preventive trial.Industrial frequency AC is pressure-resistant, lightning impulse pressure resistance, operation wave is pressure-resistant,
The dielectric(al) tests such as DC break down voltage, VFTO tests, are required in test loop be arranged in parallel portable protective gaps with test product.It is made
With being occurred in experiment power supply (testing transformer, impulse voltage generator, DC voltage generator) toning or experimentation
Resonance overvoltage, by self-discharge, plays test item when the voltage born on test item is more than that equipment presets test voltage
Protective effect can simultaneously serve as the discharging gap of operation wave wave chopping experiment.More traditional portable protective gaps are to use copper
Sphere gap, by the default copper ball clearance distance for being connected in parallel on experiment major loop, setting protection voltage range plays a protective role.
The experiment of wave wave chopping is operated using the copper ball discharging gap in parallel for introducing external trigger pulse in the loop, reaches generation specific time
The purpose of parameter wave chopping.
Invention content
The purpose of the present invention is to provide a kind of overvoltage protection, the gap and traditional copper ball portable protective gaps phase
Than, with equipment good integrity, gap discharge stability is high, controllability is good, electrode replace be easy, that environmental pollution is small is excellent
Point.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of overvoltage protection, including plexiglass cylinder, plexiglass cylinder top are provided with stainless steel upper end
Lid, plexiglass cylinder bottom is provided with stainless steel bottom end cover, plexiglass cylinder, stainless steel upper end cover and stainless steel lower end
Lid forms cylindrical seal chamber, fills SF in cylindrical seal chamber6Gas；Stainless steel pole is provided on stainless steel upper end cover
Column, the end set of upper stainless steel pole have a top electrode, stainless steel pole under being provided centrally with of stainless steel bottom end cover, under it is stainless
The end set of steel pole has lower electrode, top electrode and lower electrode to be oppositely arranged, and top electrode and lower electrode form portable protective gaps.
The present invention, which further improves, to be, the length of upper stainless steel pole or lower stainless steel pole can be adjusted, when upper
When stainless steel pole length can be adjusted, upper stainless steel pole includes the two sections of poles that are connected, and one section of pole carries internal thread, another
Duan Jizhu carries external screw thread, and two sections of poles are connected through a screw thread, and two sections of pole outer sheaths adjust sleeve equipped with clearance distance.
The present invention, which further improves, to be, it is internal thread structure that distance, which adjusts sleeve, is highly 1mm, 2mm, 3mm, 5mm
Or 10mm.
The present invention, which further improves, to be, has been uniformly arranged in the circumferential direction 8 insulated tension poles on the outside of plexiglass cylinder, often
The both ends of a insulated tension pole are arranged by insulated bolt on end cap and stainless steel bottom end cover on stainless steel.
The present invention, which further improves, to be, O-ring seal sealing is provided between insulated tension pole and insulated bolt.
The present invention, which further improves, to be, stainless steel bottom end cover is mounted in supporting insulator, and stainless steel lower end
Lid is connect with supporting insulator by inner bolt.
The present invention, which further improves, to be, the stainless steel binding post with bulb is provided on stainless steel upper end cover, stainless
There are one air inflation nozzle and a deflating valves for setting on steel bottom end cover.
The present invention, which further improves, to be, plexiglass cylinder wall thickness is more than or equal to 20mm, and insulated tension pole diameter is not small
In filling SF in 20mm, cylindrical seal chamber6Gas pressure range is 0.1~0.4MPa.
The present invention, which further improves, to be, stainless steel upper end cover and stainless steel bottom end cover diameter of phi range are 280mm
The diameter of phi range of < Φ < 320mm, top electrode and lower electrode is 100mm < Φ < 120mm, and thickness d is 20mm < d <
40mm, chamfering r are 3mm < r < 5mm.
The present invention, which further improves, to be, the material of top electrode and lower electrode is stainless steel, top electrode and lower electrode
It is round plate electrode, top electrode and lower electrode are symmetrical arranged；Plexiglass cylinder material is organic glass.
Compared with prior art, the device have the advantages that：The present invention is by designing in cylindrical seal chamber
High pressure electric test protection discharging gap, compares traditional copper ball gap, and globality is stronger, easy to carry and mobile, will not
It is damaged by mechanical external force.Meanwhile traditional copper sphere gap uses air as dielectric, inevitably such as by environmental condition
The influence of humidity, height above sea level, temperature etc. needs to carry out atmospheric conditions amendment during use.The invention avoids external environment shadows
It rings, Stability and dependability is enhanced, and is convenient for execute-in-place.The SF of certain pressure is full of in cylindrical seal chamber6Gas
Body, portable protective gaps are placed in SF6In air seal cavity, SF6Gas-insulated intensity is high, belongs to " electronegativity " gas, during pressure resistance
It is not likely to produce corona, discharge dispersity is good.Discharge voltage can be adjusted by air pressure in the present invention, can also pass through clearance distance
It is adjusted, flexibility greatly enhances.
Further, since plexiglass cylinder material is organic glass, it is possible to be clearly seen electrical discharge arc.
Further, it is placed in SF6After voltage is born at round plate electrode both ends in gas, field distribution is close to therebetween
Even electric field, discharge voltage dispersibility is small, convenient for precisely adjusting.And traditional copper ball gap being placed in air, it is uniform to reach
Electric field, the purpose for reducing discharge dispersity, only by the way of increasing sphere diameter, flexibility is not high.
Further, portable protective gaps are placed in closed cavity, and corona in air is not generated in application process, when portable protective gaps are sent out
When raw electric discharge, SF6The decomposition product that gas power generation electric arc generates will not leak, and the decomposition gas after electric discharge can be carried out easily
Recycling avoids generation corona in air and gap arc during pressure resistance compared with traditional copper ball gap being placed in air
Electric discharge generates gas ionization decomposition product and pollutes environment.Therefore the present invention has environmental-friendly compared with traditional copper ball gap
The strong feature of property.
Further, this portable protective gaps has kind of a discharge voltage (protection voltage) to adjust approach, one is by adjusting sleeve
Portable protective gaps distance is adjusted, the second is by adjusting SF6Discharge voltage is adjusted in air pressure.And traditional copper ball maintenance can only pass through
It adjusts copper ball clearance distance to achieve the purpose that adjust discharge voltage, portable protective gaps of the invention have setting mode flexibly special
Point, in laboratory applications or field application, convenience is stronger.
Further, thickness of electrode is 20mm~40mm, and chamfering is 3mm~5mm, can generate electric field to avoid electrode edge
It concentrates.
Description of the drawings
Fig. 1 is high-voltage test portable protective gaps schematic diagram of the present invention；
Fig. 2 is high voltage pressure test loop diagram.
Fig. 3 is switching impulse wave chopping device.
Fig. 4 is traditional ball gap wave chopping schematic device.
Wherein, 1 is seal cavity, and 2 adjust sleeve for clearance distance, and 3 be plexiglass cylinder, and 4 be stainless steel upper end cover,
5 stainless steel bottom end covers, 6 be upper stainless steel pole, and 7 be insulated tension pole, and 8 be insulated bolt, and 9 be top electrode, and 10 be lower electrode, 11
It is stainless steel binding post for supporting insulator, 12,13 be suction nozzle, and 14 be deflating valve, and 15 be trigger pulse introduction hole, under 16 are
Stainless steel pole.
Specific implementation mode
The present invention is described in further details below in conjunction with the accompanying drawings.
The present invention is based on, proposition use filling SFs different from traditional copper ball gap protection6The seal cavity of insulating gas
Portable protective gaps.Purpose is the precision for improving the globality of portable protective gaps, the flexibility that discharge voltage is adjusted and setting valve and controlling,
Corona is discharged not into air in testing implementation process simultaneously and arc discharge decomposes gas, has the characteristics that environmental protection.
Referring to Fig. 1, the present invention includes plexiglass cylinder 3, and 3 top of plexiglass cylinder is provided with stainless steel upper end cover 4,
3 bottom of plexiglass cylinder is provided with stainless steel bottom end cover 5, under plexiglass cylinder 3, stainless steel upper end cover 4 and stainless steel
End cap 5 forms cylindrical seal chamber 1, and stainless steel pole 6, the end of upper stainless steel pole 6 are provided on stainless steel upper end cover 4
Portion is provided with top electrode 9, stainless steel pole 16 under being provided centrally with of stainless steel bottom end cover 5, the end of lower stainless steel pole 16
It is provided with lower electrode 10, top electrode 9 and lower electrode 10 are oppositely arranged, and top electrode 9 and lower electrode 10 form protection discharging gap,
Protection is arranged with discharging gap in cylindrical seal chamber 1, does not generate corona in air during pressure resistance, is not produced after arc discharge
The raw outer gas decomposition product arranged, environmental pollution are small.Its good integrity, and volume size is small.
The length of upper stainless steel pole 6 or lower stainless steel pole 16 can be adjusted, so that protection discharging gap energy
Enough to adjust, when upper 6 length of stainless steel pole can be adjusted, upper stainless steel pole 6 includes the two sections of poles that are connected, one section of pole band
There are internal thread, another section of pole to carry external screw thread, two sections of poles are connected through a screw thread, and two sections of pole outer sheaths are equipped with gap
Distance adjusts sleeve 2, clearance distance adjust sleeve 2 for fixation go up the length of stainless steel pole 6；Protection discharge gap distance
Sleeve 2 can be adjusted by distance to be adjusted, and precision height is adjusted.It is internal thread structure that distance, which adjusts sleeve 2, be highly 1mm,
2mm, 3mm, 5mm or 10mm, it is several respectively highly to adjust sleeve, can be used cooperatively.
Instantly when 16 length of stainless steel pole can be adjusted, knot when structure can be adjusted with upper 6 length of stainless steel pole
Structure is identical.Between stainless steel upper end cover 4 and stainless steel bottom end cover 5 and positioned at 3 outside of plexiglass cylinder, circumferentially uniformly set
8 insulated tension poles 7 are equipped with, end cap 4 and stainless steel on stainless steel is arranged by insulated bolt 8 in the both ends of each insulated tension pole 7
It is provided with O-ring seal sealing on bottom end cover 5, and between insulated tension pole 7 and insulated bolt 8, is sealed.Stainless steel lower end
Lid 5 is mounted in supporting insulator 11, and stainless steel bottom end cover 5 is connect with supporting insulator 11 by inner bolt.
The stainless steel binding post 12 with bulb is provided on stainless steel upper end cover 4, on stainless steel bottom end cover 5 there are one settings
Air inflation nozzle 13 and a deflating valve 14.Insulated tension pole 7 is nylon insulated tension pole.
3 wall thickness of plexiglass cylinder is more than or equal to 20mm in the present invention, and 7 diameter of insulated tension pole is not less than 20mm, cylindrical
SF is filled in seal cavity6Gas pressure range is 0.1~0.4MPa.5 diameter range of stainless steel upper end cover 4 and stainless steel bottom end cover
It is 280mm < Φ < 320mm.
Top electrode 9 and the material of lower electrode 10 are stainless steel, and the diameter of phi range of top electrode 9 and lower electrode 10 is
100mm < Φ < 120mm, thickness d are 20mm < d < 40mm, and chamfering r is 3mm < r < 5mm.
Plexiglass cylinder 3 is due to using organic glass material, here it is apparent that electrical discharge arc.
The electrode of portable protective gaps, using being threadedly coupled, is convenient for changing with pole, pole with upper end cover.
Top electrode 9 and lower electrode 10 are round plate electrode, and top electrode 9 and lower electrode 10 are symmetrical arranged, both ends pressurization
For electric field between electrodes close to uniform electric field, discharge dispersity is small afterwards.
Discharge voltage can be adjusted by air pressure in the present invention, can also be adjusted by clearance distance, flexibility is big
Big enhancing.
The SF of certain pressure is full of in cylindrical seal chamber 16Gas, portable protective gaps are placed in SF6 air seal cavitys,
SF6 gas-insulateds intensity is high, belongs to " electronegativity " gas, is not likely to produce corona during pressure resistance, discharge dispersity is good.
SF6Gas pressure adjusts adjustment according to experimental condition；Fig. 2 is high voltage pressure test loop diagram, and Fig. 3 is that operation is rushed
Hit wave chopping device.In Fig. 2, R1, R2 be protection current-limiting resistance, in Fig. 3, RdFor protective resistance, RfIt is wave for quay resistance, Rt
Tail resistance, C2For charging capacitor, in Fig. 4, R1、R2With C1、C2Form RC divider, R3For protective resistance.During experiment, lead to
Overtesting transformer or impulse voltage generator are applied to high pressure is tested on test item TO, and Q is protection gap or operation punching
Hit wave chopping device.By rationally adjusting the discharge voltage of Q, when the voltage high-potting voltage being applied on test product TO, the gaps Q
It discharges, plays a protective role to test product TO.
The method that discharge voltage is adjusted in traditional copper ball gap is adjustment copper ball clearance distance, is generated during pressure resistance
Corona discharge generates arc cracked product after gap breakdown, pollutes environment.Discharge voltage is adjusted by air humidity, temperature in the gap
The meteorological conditions such as degree and height above sea level influence, and precision is relatively low.
Portable protective gaps of the present invention are designed using closed cavity, do not generate corona in air during pressure resistance, after gap breakdown
The electric arc decomposition product of generation can recycle, and have the characteristics that environmental-friendly, and have the advantages that globality is strong easy to remove.
It is adjusted by adjusting air pressure, gap discharge voltage is not influenced by atmospheric conditions.The present invention is using round tablet
Electrode gap, therebetween electric field belong to uniform electric field, have discharge dispersity it is small, protective device performance stablize feature.
Net insulation distance 0.6m between portable protective gaps stainless steel upper end cover 4 and stainless steel bottom end cover 5 of the present invention, according to reservation
In the case of 20% nargin, 150kV power-frequency voltages, 160kV operating impulse voltages, 200kV or more lightning impulse electricity can be resistant to
Pressure.Under 0.1Mpa, top electrode and lower interelectrode distance setting range are 5mm~30mm, under 0.2Mpa, between top electrode and lower electrode
It is 3mm~5mm apart from setting range, under 0.3MPa, top electrode is 2mm~12mm with lower interelectrode distance setting range,
Under 0.4MPa, top electrode is 1.5mm~9mm with lower interelectrode distance setting range.
It is concentrated to avoid electrode edge from generating electric field, design thickness of electrode 20mm < d < 40mm, chamfering 3mm < r < 5mm.
The present invention opens up trigger pulse introduction hole 15 at organic glass sealing bucket stainless steel bottom end cover center, can will trigger
Pulse is introduced to lower electrode 10 by the point, realizes that the triggering of the electrode during artificially making pressure resistance by external trigger pulse is put
Electricity generates wave chopping.Fig. 4 is traditional ball gap wave chopping schematic device.
Compared with traditional ball gap wave chopping device, the present invention has the following advantages：
(1) compared with traditional copper ball portable protective gaps, portable protective gaps of the invention are not by environment temperature, humidity, air pressure etc.
Atmospheric conditions limit, and are suitable for various testing grounds.
(2) compared with traditional copper ball portable protective gaps, its discharge dispersity of portable protective gaps of the invention is small, convenient for precisely whole
It is fixed.
(3) portable protective gaps of the invention are placed in closed cavity, and corona in air is not generated in application process, works as portable protective gaps
When discharging, SF6The decomposition product that gas power generation electric arc generates can be recycled easily, between traditional copper ball protection
Gap, which is compared, has the characteristics that the feature of environmental protection.
(4) discharge voltage of the invention (protection voltage) adjusts approach, one is adjusting portable protective gaps by adjusting sleeve
Distance, the second is by adjusting SF6Discharge voltage is adjusted in air pressure.It traditional copper ball gap only can be by adjusting copper ball clearance gap
From achieving the purpose that adjust discharge voltage, this portable protective gaps has the characteristics that setting mode is flexible, at laboratory applications or scene
Using convenience is stronger.
Claims (10)
1. a kind of overvoltage protection, which is characterized in that including plexiglass cylinder (3), set at the top of plexiglass cylinder (3)
It is equipped with stainless steel upper end cover (4), plexiglass cylinder (3) bottom is provided with stainless steel bottom end cover (5), plexiglass cylinder (3),
Stainless steel upper end cover (4) and stainless steel bottom end cover (5) composition cylindrical seal chamber (1), cylindrical seal chamber (1) is interior to fill
SF6Gas；Stainless steel pole (6) is provided on stainless steel upper end cover (4), on the end set of upper stainless steel pole (6) has
Electrode (9), stainless steel pole (16) under being provided centrally with of stainless steel bottom end cover (5), the end of lower stainless steel pole (16) is set
It is equipped with lower electrode (10), top electrode (9) and lower electrode (10) are oppositely arranged, and top electrode (9) and lower electrode (10) are formed between protection
Gap.
2. a kind of overvoltage protection according to claim 1, which is characterized in that upper stainless steel pole (6) or under not
The length of rust steel pole (16) can be adjusted, when upper stainless steel pole (6) length can be adjusted, upper stainless steel pole (6) packet
Connected two sections of poles are included, one section of pole carries internal thread, and another section of pole carries external screw thread, and two sections of poles are connected through a screw thread,
And two sections of pole outer sheaths adjust sleeve (2) equipped with clearance distance.
3. a kind of overvoltage protection according to claim 2, which is characterized in that it is interior spiral shell that distance, which adjusts sleeve (2),
Line structure is highly 1mm, 2mm, 3mm, 5mm or 10mm.
4. a kind of overvoltage protection according to claim 1, which is characterized in that edge on the outside of plexiglass cylinder (3)
8 insulated tension poles (7) are circumferentially evenly arranged with, the both ends of each insulated tension pole (7) are arranged by insulated bolt (8) in stainless steel
On upper end cover (4) and stainless steel bottom end cover (5).
5. a kind of overvoltage protection according to claim 4, which is characterized in that insulated tension pole (7) and insulated bolt
(8) O-ring seal sealing is provided between.
6. a kind of overvoltage protection according to claim 1, which is characterized in that stainless steel bottom end cover (5) is mounted on
In supporting insulator (11), and stainless steel bottom end cover (5) is connect with supporting insulator (11) by inner bolt.
7. a kind of overvoltage protection according to claim 1, which is characterized in that stainless steel upper end cover is arranged on (4)
There is a stainless steel binding post (12) with bulb, there are one air inflation nozzle (13) and a deflating valves for setting on stainless steel bottom end cover (5)
(14)。
8. a kind of overvoltage protection according to claim 1, which is characterized in that plexiglass cylinder (3) wall thickness is big
In equal to 20mm, insulated tension pole (7) diameter is not less than 20mm, fills SF in cylindrical seal chamber6Gas pressure range be 0.1~
0.4MPa。
9. a kind of overvoltage protection according to claim 1, which is characterized in that stainless steel upper end cover (4) and stainless
Steel bottom end cover (5) diameter of phi range is 280mm < Φ < 320mm, and the diameter of phi range of top electrode (9) and lower electrode (10) is equal
For 100mm < Φ < 120mm, thickness d is 20mm < d < 40mm, and chamfering r is 3mm < r < 5mm.
10. a kind of overvoltage protection according to claim 1, which is characterized in that top electrode (9) and lower electrode (10)
Material be stainless steel, top electrode (9) and lower electrode (10) are round plate electrode, top electrode (9) and lower electrode (10)
It is symmetrical arranged；Plexiglass cylinder (3) material is organic glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810527264.0A CN108767839A (en) | 2018-05-29 | 2018-05-29 | A kind of overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810527264.0A CN108767839A (en) | 2018-05-29 | 2018-05-29 | A kind of overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108767839A true CN108767839A (en) | 2018-11-06 |
Family
ID=64003231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810527264.0A Pending CN108767839A (en) | 2018-05-29 | 2018-05-29 | A kind of overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108767839A (en) |
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