CN1136596C - Very fast transient overvoltage suppressing method for completely enclosed combined electrical appliance - Google Patents
Very fast transient overvoltage suppressing method for completely enclosed combined electrical appliance Download PDFInfo
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- CN1136596C CN1136596C CNB001005529A CN00100552A CN1136596C CN 1136596 C CN1136596 C CN 1136596C CN B001005529 A CNB001005529 A CN B001005529A CN 00100552 A CN00100552 A CN 00100552A CN 1136596 C CN1136596 C CN 1136596C
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001052 transient effect Effects 0.000 title claims description 23
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 17
- 238000013016 damping Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 5
- 230000005764 inhibitory process Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 14
- 238000011160 research Methods 0.000 abstract description 3
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 2
- 229910000889 permalloy Inorganic materials 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 12
- 239000011324 bead Substances 0.000 description 9
- 238000009413 insulation Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000004020 conductor Substances 0.000 description 5
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- 230000004044 response Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 229910018503 SF6 Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 3
- 229960000909 sulfur hexafluoride Drugs 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
- Circuit Breakers (AREA)
- Gas-Insulated Switchgears (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention relates to a very fast transience over voltage suppressing method for a completely enclosed combined electric appliance, which belongs to the field of the research of the very fast transience over voltage of the completely enclosed combined electric appliance. In the very fast transience over voltage suppressing method for a completely enclosed combined electric appliance, a magnetic loop or a magnetic loop group composed of a plurality of magnetic loops are sheathed on one or a plurality of positions of a conductive rod passed by a traveling wave in the completely enclosed combined electric appliance for changing and damping the transmission of the traveling wave. The better materials of the magnetic loop are ferrite, and the materials of the magnetic loop can also comprise silicon steel, permalloy, etc. The very fast transience over voltage suppressing method for a completely enclosed combined electric appliance has simple implementation and can effectively reduce the amplitude value and the gradient of the very fast transience over voltage.
Description
Technical field the invention belongs to the research field of the very fast transient overvoltage of fully closed combined electric unit, particularly suppresses the method for very fast transient overvoltage.
The English name of background technology fully closed combined electric unit is Gas Insulated Substation, is called for short GIS, to call GIS in the following text.
GIS is a large-scale substation equipment.Its basic structure is: power equipments such as substation bus bar, circuit breaker, isolating switch, lightning arrester, instrument transformer are sealed in the metallic conduit of ground connection, fill sulfur hexafluoride gas with high insulation resistance, significantly reducing insulation distance, thereby reduce the volume of power equipment and the institute of transformer station takes up space.The metallic conduit of GIS is a cylindrical shape, and two kinds of structures of three-phase branch mailbox and three-phase combined type are arranged.The three-phase branch mailbox as shown in Figure 1, A, B, C three-phase high-voltage conductor 11 are sealed in respectively in separately the pipeline 12, fill the sulfur hexafluoride gas 13 with high insulation resistance in the metallic conduit, high-pressure conductor and ground conduit are coaxial configuration.Three-phase combined type as shown in Figure 2, A, B, C three-phase high-voltage conductor 21 are sealed in the same pipeline 22, fill the sulfur hexafluoride gas 23 with high insulation resistance in the metallic conduit, A, B, C three-phase are triangular arrangement.The higher GIS of electric pressure generally adopts the structure of three-phase branch mailbox.
The English name of the very fast transient overvoltage of GIS is Very Fast Transient Overvoltage, is called for short VFTO or VFT, to call VFTO in the following text.
The mechanism of production of VFTO is: when the isolating switch among the GIS or circuit breaker suit unloaded bus (or nonloaded line), (be continuous puncture, extinguish, puncture, extinguish) will take place repeatedly to puncture in the fracture of isolating switch or circuit breaker in suiting process, puncture each time and all produce a very steep capable ripple, on unloaded bus or nonloaded line, propagate and catadioptric back and forth, form very fast transient voltage.Puncture voltage when the switch fracture punctures is high more, and the row wave amplitude is then big more, and the amplitude of very fast transient voltage is also big more.Because therefore the rated voltage the when amplitude of above-mentioned very fast transient voltage is normally moved above GIS usually is called very fast transient overvoltage.For the GIS of three-phase branch mailbox and three-phase combined type, the mechanism of production of VFTO is identical with process.
In some occasions, the VFTO of GIS can reach very high amplitude and steepness, and for example, amplitude can reach the several times of GIS working voltage.The VFTO of GIS has constituted serious threat to GIS self with insulation neighboring device.Especially the higher transformer station of electric pressure (for example 500kV and more than), apparatus insulated nargin is relatively low, and the harm of VFTO is bigger.
The size of VFTO under the different application occasion of measurements and calculations GIS, amplitude and the steepness of inhibition VFTO are the major issues that relates generally in GIS research, manufacturing and the use.
Aspect the amplitude and steepness that suppress VFTO, following method is arranged at present:
1, uses lightning arrester, the amplitude of restriction VFTO.Lightning arrester can arrive certain level to the amplitude limitation of VFTO, but can not limit its steepness effectively, and the certain protection scope is arranged.The cost of lightning arrester is higher.
2, use the quick acting isolating switch, the time that suits of isolating switch is reduced in several power frequency cycles, thus the number of times that reduces to puncture repeatedly.The method can not be eliminated the threat of VFTO fully.
3, in isolating switch deciliter process, series resistance in the fracture of switch.Series resistance can reduce the amplitude of row ripple, increases the loss of row wave energy, thereby effectively reduces very fast transient overvoltage.Sealing in by the motion of switch movable contact of series resistance, when switch closes fashionablely fully, series resistance is not influenced the switch conduction running current by short circuit.The deficiency of the method is: series resistance is between the switch fracture, has increased clearance between open contacts, has increased the difficulty of switch insulation structure and Design of Mechanical Structure.
4, in isolating switch deciliter process, series inductance in the fracture of switch.Series inductance can reduce row wave steepness and amplitude, thereby reduces very fast transient overvoltage.Sealing in of series inductance also is motion by switch movable contact, and when switch closes fashionablely fully, series inductance is not influenced the switch conduction running current by short circuit.The deficiency of the method is: series inductance is between the switch fracture, has increased clearance between open contacts, has increased the difficulty of switch insulation structure and Design of Mechanical Structure; In addition, the space between the switch fracture is limited, is difficult to obtain enough big inductance.
Summary of the invention the objective of the invention is to propose a kind of method that suppresses the fully closed combined electric unit very fast transient overvoltage for overcoming the existing methods weak point, and this method is not only implemented simply, and can reduce amplitude and the steepness of VFTO effectively.
A kind of method that suppresses the fully closed combined electric unit very fast transient overvoltage that the present invention proposes, it is characterized in that, in fully closed combined electric unit, a place or plurality of positions around the conducting rod beyond the switch fracture, row ripple process, the magnet ring group that puts a magnet ring or constitute by a plurality of magnet rings, in order to the wave impedance of change conducting rod, thus the wave propagation of damping row.
Implementation method is to put one group of magnet ring on the conducting rod near isolating switch or circuit breaker preferably.This magnet ring is preferably selected the magnetic material that high frequency response characteristic is better, magnetic permeability is higher and full magnetic flux density is higher, and magnetic material comprises ferrite, silicon steel, permalloy etc., and the magnet ring material is a ferrite preferably.
Ferrite has high frequency characteristics preferably, is widely used in high-frequency circuit.Ferrite Material has the parameters such as magnetic field intensity of different magnetic permeabilitys, frequency response characteristic and saturated starting point, has the Ferrite Material of ready-made various characteristics parameter selective.
Fig. 3 is the circuit of an analogue test of demonstration effect of the present invention.Dividing bus and the shell of box GIS, the interior diameter D that wherein simulates shell 31 with one 3.5 meters long coaxial conductors simulation three-phase is that 46 millimeters, the diameter d of analog bus 32 are 14 millimeters.Intend the puncture of switch fracture in the GIS with the pass matched moulds of mercury combustion switch 33, mercury combustion switch has than the pass of similar puncture faster and closes characteristic, can produce steep capable ripple.Power supply with a capacitor C simulation GIS.Electric capacity is filled with behind the positive direct voltage, close and close mercury combustion switch, then produce a positive capable ripple and propagate to bus bar terminal B from bus head end A.At bus bar terminal B, bus is opened a way over the ground, and the wave impedance infinity produces positive total reflection to the row ripple, passes bus head end A thereby produce a positive capable ripple back from bus bar terminal B, and is superimposed upon on the existing capable ripple.At bus head end A, the high-frequency resistance of electric capacity is zero, and the capable ripple of passing back is produced negative total reflection, from and produce a negative capable ripple and pass to bus bar terminal B from bus head end A, this is born and goes ripple and also be superimposed upon on the existing capable ripple.According to this repeatedly, produce the very fast transient voltage of a vibration on bus, its maximum amplitude is the twice of electric capacity charging voltage.
When Figure 4 shows that above-mentioned analogue test without any magnet ring, the oscillogram of the very fast transient voltage at the B place, bus bar terminal position that test records, among the figure, voltage: 10V/div; Time: 20ns/div.Because the catadioptric back and forth of row ripple, very fast transient voltage is an oscillatory process, and its frequency of oscillation depends on capable velocity of wave propagation (the row velocity of wave propagation is the light velocity in the air dielectric) and propagates a distance back and forth; The amplitude of oscillating voltage approaches the twice of electric capacity charging voltage.
Further test is to lay ferrite bead 34 at bus head end position A, and magnet ring is of a size of 20 millimeters of interior diameters, 35 millimeters of overall diameters, 80 millimeters of axial lengths, and the relative permeability of magnet ring material is 1000, and the response frequency is higher than 10 megahertzes.Shown in Figure 5 is the oscillogram of the very fast transient voltage that measures at B place, bus bar terminal position when magnet ring is arranged, and this moment, the vibration of voltage almost disappeared, and voltage max approaches the charging voltage of electric capacity.This shows that ferrite bead has limited effectively with damping very fast transient voltage.The production process of the VFTO of GIS is identical with above-mentioned analogue test, adopts ferrite bead that the effect of similar inhibition VFTO also can be arranged in GIS.
The mechanism that magnet ring suppresses VFTO has the following aspects:
1, magnet ring is enclosed within on the conducting rod, has increased the inductance of local conducting rod, has limited the amplitude and the steepness of capable wave-wave head, thereby has reduced VFTO.
2, magnet ring can change the wave impedance of the conducting rod of the position of putting, and the row ripple is when propagating into this position, because catadioptric will take place in the change of wave impedance.Therefore, magnet ring can influence the Energy distribution of capable ripple and the additive process of row ripple, thereby influences VFTO.
3, the magnet ring energy of capable ripple that can be coupled, and produce loss, thus can reduce the energy of row ripple, damping VFTO.
It is relevant that magnet ring suppresses the physical dimension of the material of riding position, magnet ring of effect and magnet ring of VFTO of GIS and magnet ring, below is the explanation to these problems.
1, the riding position of magnet ring.Magnet ring is laid in place in any capable ripple process, and the effect that suppresses VFTO is all arranged.Yet different riding positions has different inhibition effects.Make magnet ring as far as possible near the switch fracture, can suppress capable wave amplitude and steepness on the whole bus, have best inhibition effect.
2, the selection of magnet ring material.The magnet ring material has frequency response characteristic, magnetic permeability and the isoparametric difference of saturated starting point magnetic field intensity.Suppress the VFTO of GIS with magnet ring, should select as far as possible that high frequency response characteristic is better, magnetic permeability is higher and the higher material of saturated starting point magnetic field intensity.In actual applications, can select ready-made Ferrite Material.
3, the physical dimension of magnet ring.In actual applications, the size of magnet ring is subjected to the restriction of space and insulation, and that can not design is very big, is advisable can effectively suppressing VFTO.The physical dimension of magnet ring can be selected as follows: (1) magnet ring can be in high potential position, closely is enclosed within on the conducting rod of GIS, and promptly the radius of the inside radius of magnet ring and conducting rod is identical.(2) magnet ring can also be on the earth potential, and promptly the inside radius of the metallic conduit of the outer radius of magnet ring and GIS is identical.(3) poor, the selection of the wall thickness of magnet ring just of the interior outer radius of magnet ring are advisable can obtain reasonably to realize insulating Design as far as possible.(4) axial dimension of single magnet ring is programmable smaller, is chosen in tens millimeter and gets final product.Select magnet ring to stack number according to concrete needs, can change the axial length of magnet ring neatly.(5) the magnet ring material is generally conductor, and the edge designs of magnet ring should be in the arc-shaped, helps uniform electric field.
The conducting rod of GIS needs long-term by big power current.Magnet ring is very little to the power frequency impedance influence of conducting rod, does not influence the characteristic of the big electric current of conducting rod conduction power frequency.
When the big electric current of power frequency, whether magnet ring can be owing to magnetic hysteresis and eddy current loss and temperature is too high at conducting rod, has carried out analogue test for this reason.Use the ferrite bead in the above-mentioned analogue test, by 1000 amperes of power currents (magnitude of GIS actual motion electric current), 10 minutes function of current time, significant temperature rise does not appear in magnet ring on the magnet ring inner wire.This test shows that under the big current conditions of power frequency, ferrite bead does not have serious loss and heating problem.
Description of drawings
The GIS structural representation that Fig. 1 is box for three-phase divides.
Fig. 2 is the GIS structural representation of Threephase common-box.
Fig. 3 suppresses the simulation experiment circuit schematic diagram of the VFTO of GIS for ferrite bead.
Fig. 4 is the very fast transient voltage oscillogram at B place, position when not laying magnet ring in the analogue test.
The very fast transient voltage oscillogram of Fig. 5 for when position A lays ferrite bead, measuring in the analogue test at B place, bus bar terminal position.
Fig. 6 is the embodiment that ferrite bead is installed in the isolating switch of actual GIS
Embodiment a kind of embodiment of the present invention as shown in Figure 6.Be the isolating switch 61 that the three-phase of a kind of 110kV divides box GIS shown in the figure, the miscellaneous part by flange 62 and GIS links to each other.Isolating switch has a fracture 63 and a built-in contact 64, controls the axial motion of built-in contact by operating mechanism, realizes the He Guanhe that cut-offs of fracture.The diameter d of conducting rod 65 is 80 millimeters, and the interior diameter D of GIS shell 66 is 300 millimeters.On the conducting rod 65 of isolating switch one end, put one group of ferrite bead 67.The selection of magnet ring material characteristic parameter can also can be determined the more characterisitic parameter of optimization by test with reference to the used magnet ring material of above-mentioned analogue test.The radial thickness T of magnet ring is chosen as tens millimeter, and the length H of single magnet ring is chosen as 50 millimeter, and the number of magnet ring can be determined flexibly, reaches desirable effect and gets final product.
Magnet ring makes the diameter of high-voltage part of isolating switch increase, and insulation distance reduces, and can suitably increase the housing diameter of one section of GIS isolating switch for this reason, is easy to realize insulating Design by electric Field Calculation.
Claims (2)
1, a kind of method that suppresses the fully closed combined electric unit very fast transient overvoltage, it is characterized in that, in fully closed combined electric unit, a place or plurality of positions around the conducting rod beyond the switch fracture, row ripple process, the magnet ring group that puts a magnet ring or constitute by a plurality of magnet rings, in order to change the wave impedance of conducting rod, the wave propagation of damping row.
2, the method for inhibition fully closed combined electric unit very fast transient overvoltage as claimed in claim is characterized in that, said magnet ring adopts ferrite.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001005529A CN1136596C (en) | 2000-01-25 | 2000-01-25 | Very fast transient overvoltage suppressing method for completely enclosed combined electrical appliance |
| JP2001016389A JP2001251713A (en) | 2000-01-25 | 2001-01-24 | Gas insulated substation, and method for suppressing steep wave surge in gas insulated substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001005529A CN1136596C (en) | 2000-01-25 | 2000-01-25 | Very fast transient overvoltage suppressing method for completely enclosed combined electrical appliance |
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| Publication Number | Publication Date |
|---|---|
| CN1258923A CN1258923A (en) | 2000-07-05 |
| CN1136596C true CN1136596C (en) | 2004-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB001005529A Expired - Fee Related CN1136596C (en) | 2000-01-25 | 2000-01-25 | Very fast transient overvoltage suppressing method for completely enclosed combined electrical appliance |
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| JP (1) | JP2001251713A (en) |
| CN (1) | CN1136596C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102832562A (en) * | 2012-08-23 | 2012-12-19 | 云南电力试验研究院（集团）有限公司电力研究院 | Leak resistance for eliminating GIS VFTO (Gas Insulated Switchgear Very Fast Transient Overvoltage) residual charge |
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| CN101799488B (en) * | 2010-02-23 | 2011-12-21 | 清华大学 | Device and method for generating nominal voltage |
| CN101865939B (en) * | 2010-06-17 | 2012-04-11 | 中国电力科学研究院 | Generation device for very fast transient overvoltage |
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| HUE034238T2 (en) | 2012-11-16 | 2018-02-28 | Abb Schweiz Ag | Method and system for suppressing very fast transients |
| CN103105521A (en) * | 2013-01-29 | 2013-05-15 | 华北电力大学 | Very fast transient overvoltage (VFTO) remote measurement system and method |
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| CN103969486B (en) * | 2014-04-30 | 2017-02-22 | 国家电网公司 | Grading ring for limiting transient voltage and current of capacitor voltage transformer |
| CN106972396A (en) * | 2017-03-20 | 2017-07-21 | 平高集团有限公司 | VFTO restraining devices, damping bus unit, bus and GIS |
| CN107068457B (en) * | 2017-05-12 | 2019-08-13 | 平高集团有限公司 | A kind of included VFTO inhibits the switch of function |
| CN106992510B (en) * | 2017-05-25 | 2019-10-15 | 云南电网有限责任公司电力科学研究院 | Inhibit the magnetic ring device of very fast transient overvoltage in gas-insulated switchgear |
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| CN110911214B (en) * | 2018-09-14 | 2021-12-10 | 平高集团有限公司 | Isolating switch capable of inhibiting VFTO and moving contact thereof |
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| CN113471947B (en) * | 2021-07-27 | 2023-06-13 | 中国电力工程顾问集团西北电力设计院有限公司 | Active suppression method and system for GIS (gas insulated switchgear) ultra-fast transient overvoltage |
| CN115688661B (en) * | 2022-12-30 | 2023-03-31 | 华中科技大学 | Modeling method for full circuit parameters of spiral tube type damping bus for VFTO (very fast transient overvoltage) suppression |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61254011A (en) * | 1985-05-02 | 1986-11-11 | 株式会社日立製作所 | Gas insulated switchgear |
| JPH027810A (en) * | 1988-06-24 | 1990-01-11 | Nissin Electric Co Ltd | Compressed-gas-insulated switchgear |
| JP2762654B2 (en) * | 1990-02-13 | 1998-06-04 | 日新電機株式会社 | Gas insulated switchgear |
| JPH0950907A (en) * | 1995-08-04 | 1997-02-18 | Hitachi Metals Ltd | Magnetic core for gas-insulated switch |
| JPH0970115A (en) * | 1995-08-31 | 1997-03-11 | Mitsubishi Electric Corp | Bushing for transformer |
| JP2000021275A (en) * | 1998-06-30 | 2000-01-21 | Hitachi Ltd | Gas insulated appliance |
-
2000
- 2000-01-25 CN CNB001005529A patent/CN1136596C/en not_active Expired - Fee Related
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- 2001-01-24 JP JP2001016389A patent/JP2001251713A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832562A (en) * | 2012-08-23 | 2012-12-19 | 云南电力试验研究院（集团）有限公司电力研究院 | Leak resistance for eliminating GIS VFTO (Gas Insulated Switchgear Very Fast Transient Overvoltage) residual charge |
| CN102832562B (en) * | 2012-08-23 | 2015-10-28 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of bleeder resistance system eliminating GISVFTO residual charge |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001251713A (en) | 2001-09-14 |
| CN1258923A (en) | 2000-07-05 |
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