CN101621185B - Transformer neutrality point combination electric device - Google Patents
Transformer neutrality point combination electric device Download PDFInfo
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- CN101621185B CN101621185B CN200910053076XA CN200910053076A CN101621185B CN 101621185 B CN101621185 B CN 101621185B CN 200910053076X A CN200910053076X A CN 200910053076XA CN 200910053076 A CN200910053076 A CN 200910053076A CN 101621185 B CN101621185 B CN 101621185B
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- grounding
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Abstract
The invention discloses a transformer neutrality point combination electric device comprising a base (1), wherein the base (1) is grounded and provided with an insulating support post (2), and the insulating support post (2) is provided with a horizontal high-voltage arm (8'), and the horizontal high-voltage arm (8') is connected with a transformer neutrality point (N) and provided with a fixed contact (7); the base (1) is also provided with a grounding post (5), the grounding post (5) is provided with a horizontal grounding arm (9') which is sleeved with a grounding sleeve pipe (10), an insulating bushing is arranged between the grounding arm (9') and the grounding sleeve pipe (10), and the grounding sleeve pipe (10) can slide relative to the grounding arm (9'); the high-voltage arm (8') is provided with a high-voltage electrode (8), the grounding arm (9') is provided with a grounding electrode (9), the high-voltage electrode (8) and the grounding arm (9') are coaxial, oppositely arranged and form a protection gap (J), and the grounding sleeve pipe (10) is provided with a division and combination adjusting device. The invention has simple structure and high aggregation degree.
Description
Technical field
The present invention relates to the power transmission technology category, is the transformer neutral point combined electrical apparatus device to present 110kV, the integrated equipment of required each the equipment item function combinations of 220kV transformer neutral point.
Background technology
Stipulate according to the power industry standard DL/T620-1997 of the People's Republic of China (PRC) " overvoltage protection of alternating-current electric device and insulation coordination "; 110kV, 220kV power network (hereinafter to be referred as electrical network) belong to useful earthing electric network; promptly the voltage of (greatly) over the ground of neutral point of electric network is " 0 " or approach " 0 " when actual motion; the necessary effective grounding of the neutral point of this type of electrical network, the ground connection of neutral point of electric network is to realize by the ground connection of transformer neutral point in the electrical network.Then adopt selectivity ground connection operational mode during actual motion, i.e. during operation of power networks the neutral point of part transformer through the direct ground connection of neutral point isolating switch of special use, the then earth-free operation of the neutral point of remaining transformer.
So during the design of transformation station:
1, consider direct ground connection of change grounding mode of transformer neutral-point in service or earth-free needs, transformer neutral point must be installed the neutral point isolating switch and claim earthed switch again.
2, this type of electrical network forms local ungrounded electric net work because of certain reason is accidental; and when single phase ground fault takes place; under this unusual service condition; electrical network may produce higher power-frequency overvoltage; and the safety of electric equipment in this electrical network threatened; press the regulation of DL/T620-1997, the neutral point of earth-free transformer should be installed clavate air conservation gap and claim excellent gap again for this reason.
3, in particular cases, consider the ability to bear of transformer neutral point to Lightning Over-voltage, also need install the neutral point metal oxide arrester, english abbreviation MOA is hereinafter to be referred as MOA at some.
Be commonly referred to as " neutral point equipment " at this equipment that will be installed in this type of transformer neutral point, promptly be installed in the device of transformer neutral point.
At present designing unit when the design of new transformer station or manufacturing enterprise all dispose transformer neutral point equipment when transforming by mentioned above principle at old station, general transformer neutral point must be furnished with neutral point isolating switch and protection gap, two equipment are installed in parallel, as shown in Figure 1; Special transformer then is installed in parallel by neutral point isolating switch, protection gap and three equipment of neutral point metal oxide arrester to be formed, as shown in Figure 2.Fig. 1, Fig. 2 are the Design Modes that generally adopts at present, and the left side is the neutral point isolating switch among Fig. 1, and the right side is the protection gap; The left side is the neutral point isolating switch among Fig. 2, and the centre is MOA, and the right side is the protection gap.
Neutral point isolating switch among the figure is generally GW13, and the protection gap has specialized factory to produce or self-control at the scene, the special-purpose MOA of the transformer neutral point that MOA then adopts specialized factory to produce.These devices are installed on the same channel-section steel support, and make it be in suitable height by one or two pillars, are electrically connected then.
There is following subject matter in this conventional design pattern:
1, it is not truly a Combination Design, only is that each function device is bolted together at the scene, and it is bigger to take up room, and equipment is from different manufacturing firms.
2, use the quantity of porcelain element many, as needing among Fig. 1 with three porcelain knobs; Need with four porcelain spares i.e. three porcelain knobs, the insulator of a MOA among Fig. 2.Thereby overall weight is big, and consumption porcelain resource is many.
3, whole device combination back longitudinal length is longer, is not suitable for the use at indoor and underground station such as 110kV.
4, GW13 series neutral point isolating switch is two pivoted arm opposite structures, and contact stabilization is not ideal enough.
5, reach 3.5m when above for the vertical spread length of equipment, must adopt twin props mounting structure, basis and pillar expense height.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of simple in structure, transformer neutral point combined electrical apparatus device that aggregation degree is high.
For solving the problems of the technologies described above; transformer neutral point combined electrical apparatus device of the present invention; comprise a pedestal; described pedestal ground connection; one insulation support column is set on the described pedestal; on the described insulation support column high-voltage arm is set; described high-voltage arm links to each other with described transformer neutral point; certain contact is set on the described high-voltage arm, an earthing rod also is set on the described pedestal, described earthing rod is provided with the grounding arm of a level; socket one grounding sleeve on the described grounding arm; between described grounding arm and the described grounding sleeve insulating bushing is set, described grounding sleeve can slide with respect to described grounding arm, on the described high-voltage arm high-field electrode is set; on the described grounding arm grounding electrode is set; described high-field electrode and described grounding electrode are oppositely arranged and constitute and protect the gap on same axis, and described grounding sleeve is provided with deciliter adjusting device.
Preferably, described deciliter adjusting device is a toggle, comprises the rotating shaft of a vertical direction, and the pivoted arm of a level is fixed in described rotating shaft, and described pivoted arm is hinged with tranverse connecting rod and is parallel, and described tranverse connecting rod and described grounding sleeve are hinged.
Further, described rotating shaft is arranged in the rotating shaft column jecket, and described rotating shaft is fixedlyed connected with power transmission shaft, and described power transmission shaft is driven by actuating unit, and described rotating shaft column jecket is fixed on the described pedestal.
Preferably, between described pivoted arm and the described tranverse connecting rod, between described tranverse connecting rod and the grounding sleeve and all be provided with dielectric isolation layer between rotating shaft upper and lower side and the described rotating shaft column jecket.
Preferably, a ground connection diversion column is set on the described pedestal, described ground connection diversion column links to each other with described grounding sleeve by flexible conductor.
Further, on the described ground connection diversion column switch grounded circuit current transformer is set.
Preferably, gap discharge loop current instrument transformer is set on the described earthing rod.
Preferably, describedly decide the positive integral body of contact and be plum blossom shape, describedly decide the contact inner ring and be provided with and be with flexible conductive contact film.
Preferably, described high-field electrode is detachably connected on the described high-voltage arm, and described grounding electrode is detachably connected on the described grounding arm, and described high-voltage arm links to each other with described transformer neutral point, and described grounding arm links to each other with described earthing rod.
Further, described high-field electrode and described high-voltage arm be for being threaded, and described grounding electrode and described grounding arm are for being threaded.
The present invention compares with existing transformer neutral point protective device, has the following advantages:
1, adopt grounding sleeve to be placed in outside the grounding arm, left and right sides straight line moves " branch " of realizing switch, the structural design of " closing " function has changed " branch ", " closing " structure of former GW13 class earthed switch opposite, have simple in structurely, moving component is few, advantages such as stable action;
2, will protect gap and neutral point isolating switch closely to combine together, accomplish " branch ", " closing " accurate positioning and occupied horizontal space little;
3, adopt circular moving contact, decide structure of contact terminal and can carry out centralized positioning automatically, the action good reproducibility is difficult for displacement, the reliability height, the transition contact resistance is little;
No matter 4 is neutral point isolating switch and the combination of protecting the gap, or the neutral point isolating switch, protection gap and MOA three's combination, this combined electrical apparatus device only need reduce device cost with a porcelain spare, has reduced overall weight;
5, all functions part is assemblied on the same pedestal, the aggregation degree height, and globality is strong, and the on-site installation work amount is little;
6, combined electrical apparatus device longitudinal size is little, and on-the-spot only the need adopted the single-column mounting means, and floor space is little, has reduced the capital construction cost, is specially adapted to the indoor substation of limited space system or is arranged in underground transformer station.
Description of drawings
Fig. 1 is existing transformer neutral point neutral point isolating switch-protection gap on-site consolidation structural representation commonly used.
Fig. 2 is existing transformer neutral point neutral point isolating switch-protection gap-MOA on-site consolidation structural representation commonly used.
Fig. 3 is the structural representation that neutral point isolating switch of the present invention is in off-state.
Fig. 4 is the structural representation that neutral point isolating switch of the present invention is in closure state.
Reference numeral is as follows:
1, pedestal 18, power transmission shaft
2, insulation support column 19, high-voltage connection
3, ground connection diversion column 20, mounting column
4, rotating shaft column jecket 21, ground connection band iron
5, earthing rod 22, switch grounded circuit current transformer CT
D
6, high-voltage connection plate 23, gap discharge loop current instrument transformer CT
J
7, decide contact N, transformer neutral point
8, high-field electrode J, protection gap
8 ', high-voltage arm E, ground network
9, grounding electrode Z, decide contact conductive contact film and moving contact contact point
9 ', grounding arm I
KE, when the neutral point isolating switch is closed by transformer neutrality
10, the earth current of grounding sleeve point N outflow
11, insulating bushing I
J, flow through gap and the last earth mat that flows into during gap discharge
12, flexible conductor discharging current
13, the center line of rotating shaft O-O high-field electrode and grounding electrode
14, pivoted arm O
1-rotating shaft pivot
15, pivoted arm end pin O
2The hinged center of-pivoted arm end pin and tranverse connecting rod
16, tranverse connecting rod O
3The hinged center of-sleeve end pin and tranverse connecting rod
17, sleeve end pin
Embodiment
Hereinafter with reference to the accompanying drawings transformer neutral point combined electrical apparatus device of the present invention is described in detail.
Problem at existing transformer neutral point equipment existence; and the functional characteristics of each equipment; the present invention proposes a kind of new transformer neutral point combined electrical apparatus device; core of the present invention is that the neutral point isolating switch is combined together with protection gap J; and all devices are installed on the same pedestal 1, as shown in Figure 3, Figure 4.
The present invention includes pedestal 1, insulation support column 2, high-field electrode 8, grounding electrode 9, decide contact 7, grounding sleeve 10, earthing rod 5, rotating shaft 13, ground connection diversion column 3 etc.
On pedestal 1 from left to right respectively vertical fixing insulation support column 2, ground connection diversion column 3, rotating shaft column jecket 4 and earthing rod 5 are arranged.Insulation support column 2 can be porcelain knob, also can be metal oxide arrester MOA.
Top at porcelain knob (or MOA) 2, be fixed with high-voltage connection plate 6, high-voltage connection plate 6 left ends link to each other with transformer neutral point N by high-voltage connection 19, the right-hand member of high-voltage connection plate 6 connect the high-voltage arm 8 of a tubulose ', connect high-field electrode 8 at high-voltage arm 8 ' right-hand member, high-field electrode 8 and high-voltage arm 8 ' between for being threaded.High-voltage connection 19 is fixed on the high-voltage connection plate 6 by screw.High-voltage connection plate 6 is fixed on the porcelain knob 2 by screw.High-voltage arm 8 ' on be provided with and decide contact 7.
Above-mentionedly decide contact 7 positive integral body and be the plum blossom shape, decide contact 7 inner ring settings and be with flexible conductive contact film.
Be oppositely arranged at high-field electrode 8 and grounding electrode 9 coaxial lines, grounding arm 9 ' horizontal fixed is in the upper end of earthing rod 5.Grounding arm 9 ' on be with grounding sleeve 10, grounding sleeve 10 and grounding arm 9 ' between be provided with insulating bushing 11, make grounding arm 9 ' and grounding sleeve 10 between realize that electricity isolates, and have and go up kilovolt dielectric strength of level.Insulating bushing 11 and grounding arm 9 ' between be matched in clearance, grounding sleeve 10 concerns for interference fit with insulating bushing 11, thus grounding sleeve 10 with insulating bushing 11, can along grounding arm 9 ' axially horizontally slip.
Wherein form the neutral point isolating switch by deciding contact 7, grounding sleeve 10, flexible conductor 12, ground connection diversion column 3.Deciding contact 7 promptly is the high compression set contact of neutral point isolating switch; Grounding sleeve 10 promptly is the moving contact of neutral point isolating switch; Form protective gap of neutral point J by high-field electrode 8, grounding electrode 9, earthing rod 5.
Grounding sleeve 10 is in low order end in Fig. 3, and at this moment the right-hand member of high-field electrode 8 is coaxial relative with the left end of grounding electrode 9, and keeps certain space length, promptly forms protection gap J.
Because high-field electrode 8 protrudes to the right and decides contact 7; the left end of grounding electrode 9 protrudes from the termination of grounding sleeve 10 left; so to be high pressure extreme and the minimum spacing of ground connection between extremely for protection gap J; if this moment, the high voltage of certain amplitude appearred in transformer neutral point N; gap J is with breakdown in protection, the disruptive discharge electric current I
JWill be successively through grounding electrode 9-grounding arm 9 '-earthing rod 5-pedestal 1-ground connection band iron 21-ground network E, thereby flow into the earth.At this moment be placed in the gap discharge loop current instrument transformer CT outside the earthing rod 5
J23 secondary side will have current signal output.Because grounding electrode 9 insulate with grounding sleeve 10, thereby the gap discharge electric current I
JCan not be successively through flexible conductor 12-ground connection diversion column 3-ground network E, thus flow into the earth, so switch grounded circuit current transformer CT
D22 secondary side does not have electric current output.Disconnect so Fig. 3 is a neutral point isolating switch of the present invention, transformer neutral point N is earth-free, and transformer neutral point N is in the operating state under the gap protection.
When grounding sleeve 10 along the axes O of grounding electrode 9 and high-field electrode 8-when the O right-to-left slides into left end, the left end head of grounding sleeve 10 will insert to be decided in the contact 7, the conductive contact film of deciding contact 7 inner rings relies on elastic force that the insertion portion of grounding sleeve 10 is tightly embraced, and forms the favorable conductive contact relation at contact point Z place.This moment transformer neutral point N successively through high-voltage connection 19-high-voltage connection plate 6-high-voltage arm 8 '-Ding contact 7-contact point Z-grounding sleeve 10-flexible conductor 12-ground connection diversion column 3-pedestal 1-ground connection band iron 21-ground network E, realize the direct ground connection of transformer neutral point N, as shown in Figure 4.If electrical network generation this moment single phase ground fault, then the fault current I of platform transformer neutral point N output thus
KETo flow into the earth through above-mentioned approach, be enclosed within the switch grounded circuit current transformer CT outside the ground connection diversion column 3 this moment
D22 secondary side has corresponding electric current output.Since very little from the resistance value between the N-E, so the pressure drop over the ground of N point is also little, add the effect I of insulating bushing 11
KECan not flow through earthing rod 5, so gap discharge loop current instrument transformer CT
J23 secondary side can not have electric current output.
As from the foregoing, in the said structure, except high-field electrode 8, grounding electrode 9, all the other structures can be formed the transformer neutral point isolating switch.Grounding sleeve 10 inserts the state of deciding in the contact 7 is in " closure " for the neutral point isolating switch state.Grounding sleeve 10 is in the state of " disconnection " for the neutral point isolating switch away from the state of deciding contact 7.
Ground connection pipe box 10 grounding arm 9 ' on to horizontally slip be to be that the driving of toggle realizes by deciliter adjusting device.Toggle comprises the pivoted arm 14 and the tranverse connecting rod 16 of vertical rotating shaft 13, level, and pivoted arm 14 is vertically fixed in the rotating shaft 13, and pivoted arm 14 is hinged with an end of the tranverse connecting rod 16 of level by pivoted arm end pin 15.The other end of tranverse connecting rod 16 by sleeve end pin 17 be hinged on grounding sleeve 10 below.
The power transmission shaft 18 of rotating shaft 13 below it links to each other, and power transmission shaft 18 is driven by actuating unit, along power transmission shaft 18 self axes O
1Rotation.Actuating unit does not draw in the drawings.Rotating shaft 13 is limited in rotating in the rotating shaft column jecket 4, and rotating shaft column jecket 4 is fixed on the pedestal 1.
When a deciliter adjusting device is in " branch " position when being neutral point isolating switch open position, pivoted arm 14 and pivoted arm end pin 15 are in low order end, through tranverse connecting rod 16 and sleeve end pin 17 grounding sleeve 10 are locked in low order end simultaneously, as shown in Figure 3.
After a deciliter adjusting device obtains " closing " instruction, rotating shaft 13 drive pivoted arms 14 and pivoted arm end pin 15 are rotated in the horizontal plane direction by power transmission shaft 18.Pivoted arm end pin 15 drives tranverse connecting rod 16 simultaneously and is moved to the left, under the drive of tranverse connecting rod 16, slide left by the axis direction of sleeve end pin 17 promotion grounding sleeves 10 along grounding electrode 9, left end insertion until grounding sleeve 10 is decided in the contact 7, and closely contact, and keep good electrical contact at the Z point with the conductive contact film of deciding contact 7.At this moment operating mechanism stops operating, this moment transformer neutral point N successively through high-voltage connection 19-high-voltage connection plate 6-high-voltage arm 8 '-the contact 7-contact point Z-grounding sleeve 10-flexible conductor 12-ground connection diversion column 3-pedestal 1-ground connection band iron 21 of Dinging directly is connected with earth mat E, as shown in Figure 4.Protect gap J to be in the tube chamber of grounding sleeve 10 this moment, and by short circuit, cut little ice.
Between sleeve end pin 17 and tranverse connecting rod 16 left-hand end cover; Between tranverse connecting rod 16 right-hand ends cover and the pivoted arm end pin 15; And all be provided with dielectric isolation layer (do not give among the figure and marking) between rotating shaft 13 upper and lower sides and the rotating shaft column jecket 4, make insulation between whole toggle and the grounding sleeve 10, so when neutral point isolating switch closure, the direct ground connection operation of transformer neutral point N, during electrical network generation single phase ground fault, fault current I
KECan not produce shunting from toggle, this insulating barrier has also played the effect that reduces toggle frictional resistance simultaneously.
When the present invention is in state shown in Figure 4, when operating mechanism obtains " branch " instruction, rotating shaft 13 rotations; lead agency moves in the other direction; at first grounding sleeve 10 is pulled out from decide contact 7, continue pulling grounding sleeve 10 then, slide to the right; get back to position shown in Figure 3 until grounding sleeve 10; actuating unit stops operating, and grounding sleeve 10 is locked in position shown in Figure 3 once more, and the neutral point isolating switch disconnects; transformer neutral point N is ground connection no longer, and protection gap J comes into operation automatically.
More than be the structure and the operation principle of transformer neutral point combined electrical apparatus device of the present invention.
When the equipment that is installed in 2 positions is porcelain knob, be neutral point isolating switch and the combination of protecting gap J;
When the equipment that is installed in 2 positions is MOA, be neutral point isolating switch, protection gap J and MOA three's combination.
So the difference of two kinds of combinations only is to support the selected device difference of high-pressure side parts in the left side, no matter but which kind of combination all only need with a support porcelain part---the outer insulator of porcelain knob or MOA.
Because the compact conformation longitudinal size is less, only needs during on-the-spot the installation that pedestal 1 is fixed in mounting column 20 upper ends and get final product.
High-field electrode 8 be detachably connected on described high-voltage arm 8 ' on, described grounding electrode 9 be detachably connected on described grounding arm 9 ' on, described high-voltage arm 8 ' link to each other described grounding arm 9 ' link to each other with described transformer neutral point N with high-voltage connection 19 with described earthing rod 5 by high-voltage connection plate 6.When removing high-field electrode 8 and grounding electrode 9, the present invention can be used as the transformer neutral point isolating switch of a platform independent.
Particularly, described high-field electrode 8 and described high-voltage arm 8 ' for being threaded, described grounding electrode 9 and described grounding arm 9 ' for being threaded.Be set to be threaded; realize that on the one hand high-field electrode 8 and grounding electrode 9 can pull down from the present invention, on the other hand, rotation high-field electrode 8 or grounding electrode 9; can regulate the distance of the protection gap J between two electrodes 8,9, thereby set up the discharge voltage value of protection gap J.
Above-mentioned design example only is used for that the present invention will be described, does not constitute the restriction to the claim scope, and other substantial equivalence means that it may occur to persons skilled in the art that are all in claim scope of the present invention.
Claims (10)
1. transformer neutral point combined electrical apparatus device; comprise a pedestal (1); described pedestal (1) ground connection; one insulation support column (2) is set on the described pedestal (1); high-voltage arm (8 ') is set on the described insulation support column (2); described high-voltage arm (8 ') links to each other with described transformer neutral point (N); it is characterized in that: certain contact (7) is set on the described high-voltage arm (8 '); one earthing rod (5) also is set on the described pedestal (1); described earthing rod (5) is provided with grounding arm (9 '); described grounding arm (9 ') is gone up socket one grounding sleeve (10); between described grounding arm (9 ') and the described grounding sleeve (10) insulating bushing is set; described grounding sleeve (10) can slide with respect to described grounding arm (9 '); high-field electrode (8) is set on the described high-voltage arm (8 '); grounding electrode (9) is set on the described grounding arm (9 '); described high-field electrode (8) and described grounding electrode (9) are on same axis; be oppositely arranged and constitute and protect gap (J), described grounding sleeve (10) is provided with deciliter adjusting device.
2. transformer neutral point combined electrical apparatus device according to claim 1, it is characterized in that: described deciliter adjusting device is a toggle, comprise the rotating shaft (13) of a vertical direction, the pivoted arm (14) of a level is fixed in described rotating shaft (13), described pivoted arm (14) is hinged with tranverse connecting rod (16) and is parallel, and described tranverse connecting rod (16) is hinged with described grounding sleeve (10).
3. transformer neutral point combined electrical apparatus device according to claim 2, it is characterized in that: described rotating shaft (13) is arranged in the rotating shaft column jecket (4), described rotating shaft (13) is fixedlyed connected with power transmission shaft (18), described power transmission shaft is driven by actuating unit, and described rotating shaft column jecket (4) is fixed on the described pedestal (1).
4. transformer neutral point combined electrical apparatus device according to claim 3 is characterized in that: between described pivoted arm (14) and the described tranverse connecting rod (16), between described tranverse connecting rod (16) and the grounding sleeve (10) and all be provided with dielectric isolation layer between rotating shaft (13) upper and lower side and the described rotating shaft column jecket (4).
5. transformer neutral point combined electrical apparatus device according to claim 1 is characterized in that: a ground connection diversion column (3) is set on the described pedestal (1), and described ground connection diversion column (3) links to each other with described grounding sleeve (10) by flexible conductor (12).
6. transformer neutral point combined electrical apparatus device according to claim 5 is characterized in that: switch grounded circuit current transformer (22) is set on the described ground connection diversion column (3).
7. transformer neutral point combined electrical apparatus device according to claim 1 is characterized in that: gap discharge loop current instrument transformer (23) is set on the described earthing rod (5).
8. transformer neutral point combined electrical apparatus device according to claim 1 is characterized in that: describedly decide the positive integral body of contact (7) and be plum blossom shape, describedly decide contact (7) inner ring setting and be with flexible conductive contact film.
9. transformer neutral point combined electrical apparatus device according to claim 1, it is characterized in that: described high-field electrode (8) is detachably connected on the described high-voltage arm (8 '), described grounding electrode (9) is detachably connected on the described grounding arm (9 '), described high-voltage arm (8 ') links to each other with described transformer neutral point (N), and described grounding arm (9 ') links to each other with described earthing rod (5).
10. transformer neutral point combined electrical apparatus device according to claim 9 is characterized in that: described high-field electrode (8) and described high-voltage arm (8 ') be for being threaded, and described grounding electrode (9) and described grounding arm (9 ') are for being threaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910053076XA CN101621185B (en) | 2009-06-15 | 2009-06-15 | Transformer neutrality point combination electric device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910053076XA CN101621185B (en) | 2009-06-15 | 2009-06-15 | Transformer neutrality point combination electric device |
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| Publication Number | Publication Date |
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| CN101621185A CN101621185A (en) | 2010-01-06 |
| CN101621185B true CN101621185B (en) | 2011-07-20 |
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| CN200910053076XA Expired - Fee Related CN101621185B (en) | 2009-06-15 | 2009-06-15 | Transformer neutrality point combination electric device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104218451B (en) * | 2014-09-17 | 2017-09-01 | 国家电网公司 | A kind of compound electrode of discharging gap apparatus |
| CN104764411B (en) * | 2015-04-01 | 2018-04-10 | 华北电力大学 | Portable protective gaps measurement apparatus and method |
| CN106505521A (en) * | 2016-11-28 | 2017-03-15 | 国家电网公司 | A kind of earthing or grounding means of transformer neutral point Integrated Protection System |
| WO2018188058A1 (en) * | 2017-04-14 | 2018-10-18 | 深圳市方鹏科技有限公司 | Energy control and utilization system for intelligent robot |
| CN107240903B (en) * | 2017-05-23 | 2019-02-22 | 辽宁恒电高压开关有限公司 | Totally enclosed type neutral point gap earth protective device |
| CN107863754B (en) * | 2017-11-09 | 2019-08-02 | 南通盛洋电气有限公司 | A kind of transformer leakage stream automatic earthing electric installation |
| CN109254233A (en) * | 2018-10-24 | 2019-01-22 | 国网山东省电力公司电力科学研究院 | A kind of transformer electric fault gas simulator |
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| CN2888710Y (en) * | 2006-03-06 | 2007-04-11 | 新乡市电业局电力修试安装公司 | Neutral point protector for 110KV or 220KV transformer |
| CN201134670Y (en) * | 2007-12-14 | 2008-10-15 | 西安盟创电器有限公司 | Grounding protecting equipment for controllable current limiting neutral point |
| CN201426015Y (en) * | 2009-06-15 | 2010-03-17 | 上海安越电气工程技术有限公司 | Transformer neutral point composite apparatus device |
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2009
- 2009-06-15 CN CN200910053076XA patent/CN101621185B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2888710Y (en) * | 2006-03-06 | 2007-04-11 | 新乡市电业局电力修试安装公司 | Neutral point protector for 110KV or 220KV transformer |
| CN201134670Y (en) * | 2007-12-14 | 2008-10-15 | 西安盟创电器有限公司 | Grounding protecting equipment for controllable current limiting neutral point |
| CN201426015Y (en) * | 2009-06-15 | 2010-03-17 | 上海安越电气工程技术有限公司 | Transformer neutral point composite apparatus device |
Non-Patent Citations (1)
| Title |
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| JP平3-107313A 1991.05.07 |
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