CN1250217A - Electric distribution transformer and distribution connection method - Google Patents
Electric distribution transformer and distribution connection method Download PDFInfo
- Publication number
- CN1250217A CN1250217A CN 98120080 CN98120080A CN1250217A CN 1250217 A CN1250217 A CN 1250217A CN 98120080 CN98120080 CN 98120080 CN 98120080 A CN98120080 A CN 98120080A CN 1250217 A CN1250217 A CN 1250217A
- Authority
- CN
- China
- Prior art keywords
- phase
- high pressure
- voltage
- exit
- distribution transformer
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title description 2
- 238000004804 winding Methods 0.000 claims abstract description 41
- 230000007935 neutral effect Effects 0.000 claims description 4
- 101710148027 Ribulose bisphosphate carboxylase/oxygenase activase 1, chloroplastic Proteins 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 63
- 230000004907 flux Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 101710201629 Ribulose bisphosphate carboxylase/oxygenase activase 2, chloroplastic Proteins 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000008384 inner phase Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Landscapes
- Housings And Mounting Of Transformers (AREA)
Abstract
The electric distribution transformer is one three-phase five-column structure and has three high-voltage windings with six leading out terminals altogether. In the high-voltage side, each high-voltage winding has serial air-insulated high-voltage fuse to constitute the "high-voltage phase arm", which is used as connection unit of D-shaped connection mode.The low-voltage side adopts three-phase four-line yn connection mode to power consumers. The present invention has the advantages of no mutual interference among the three phases of voltage; maximum unbalanced three-phase load tolerance; self-inhibiting capacity to zero-sequence harmonics in power network; and adaptability to various electric power systems with different earthing modes.
Description
The invention belongs to the electric power facility class, relate to a kind of distribution transformer and distribution mode of connection.
At present; in some countries; particularly in China; city and rural power distribution net mostly are the not directly grounded overhead wire network of neutral point; the distribution transformer that uses adopts the winding coupling group of three-phase three-column magnetic circuit mostly to be D in a large number, yn or Y, distribution transformer on the post of yn; be equipped with fuse switch in the high-pressure side, as error protection.
The distribution transformer of above-mentioned routine and the shortcoming of power distribution network are: hinder for some reason, and when a phase (as the A phase) fusing takes place in high fuse,＜1〉at D, in the network of yn, the fault phase voltage of low pressure is
U
φ H=0.5U
φ HUb=U
φ HAt Y, in the network of yn, fault phase Ua=0,
U
φ H=0.87 U
φ H(U
φ HRepresent specified phase voltage)＜2 at Y, in the network of yn,, can cause the low-pressure side phase voltage obviously to raise when serious because of neutral point drifting takes place in the asymmetric meeting of loading, in a word, obvious reduction of the voltage of low-pressure side or obvious rising all can damage even burn user's electric equipment.
People are seeking result of the above problems always: a kind of way is by the IEC-420 standard-required; fuse switch is clashed into the on-load switch release with striker; pass through the disjunction simultaneously of on-load switch three-phase when making one the fault fuse blows is arranged mutually; though can protect load effectively; but artificially enlarged the power failure scope; particularly increase the more expensive equipment of prices such as on-load switch and occupied the space; this only could carry out in high-tension switch cabinet; and still unreasonable, and this way out of doors pole type transformer be equipped with in the operational mode of high-voltage explosion fuse protection and can't adopt.Someone proposes another kind of way is to adopt the method protection load of low pressure automatic air-break switch under voltage protection in the distribution transformer low-pressure side; because high pressure or superhigh pressure reclosing system are at recoverable transient fault in the high-pressure system; high side switch tripping operation is through once even after twice reclosing recover to send electricity again; the distribution system low-pressure side is because the existence of under voltage protection; make automatic air-break switch disconnect already; can't recover automatically to send; power supply department must send someone to close a floodgate one by one, and is obviously unrealistic.If solve the problem that this user's power supply can not recover automatically with long delay under voltage protection scheme; because reclosure time long (0.3-0.5 second for the first time; be generally for the second time 180 seconds promptly 3 minutes); exist the setting of secondary power supply and the harsh requirement that long delay is kept constant voltage; be difficult to technically realize, both made realization also extremely uneconomical.
At present, most of city transmission and distribution network and vast rural power grids still send with the protected mode that distribution transformer on traditional post is equipped with fuse switch.Above-mentioned inherent shortcoming never solves.
Purpose of the present invention, no matter provide is in neutral ground or earth-free electric power system, can both one mutually or two-phase break down and cause one mutually or during the fusing of two-phase high-tension fuse, guarantee that the two-phase or that other is sound still keeps specified phase voltage normal power supply mutually; The assurance three-phase is still kept the rated voltage operation under the extremely asymmetric situation of load; Can absorb a kind of distribution transformer and the distribution mode of connection of the harmonic wave of all zero sequence character in the electrical network.
Technical scheme of the present invention: comprise a kind of new distribution transformer structure and be connected into the distribution mode of connection that a kind of three-phase voltage is not interfered with or disturb each other mutually with it and air-insulated high-tension fuse.
Its distribution transformer has the three-phase and five-pole magnetic structure, is wound with three-phase high-voltage winding WA1, WB1, WC1 and low pressure winding WA2, WB2, WC2 on the three post magnetic circuits therein; The WA2-x of low pressure winding, WB2-y, three tail ends of WC2-z are connected, and draw from exit n; WA2-a
, WB2-b
, WC2-c
Three head ends are drawn from exit a, b, c, three head end WA1-A of high pressure winding
, WB1-B
, WC1-C
Be to draw from A1, B1, C1 exit, three tail end WA1-X, WB1-Y, the WC1-Z of its high pressure winding are also drawn by bushing A ', B ', C ' exit respectively.
Its distribution mode of connection, comprise distribution transformer and air-insulated high-tension fuse, its distribution transformer is the above-mentioned distribution transformer with five post magnetic structures and six exits of high pressure winding, its low-pressure side is connected to user Za, Zb, Zc from four exit a, b, c, n of distribution transformer, and promptly low-pressure side is the distribution system of the three-phase and four-line of yn connection.Its high-pressure side wiring is the end RA-1 with high-tension fuse, RB-1, RC-1 respectively with three exit A of distribution transformer high pressure winding, B, C is connected, the other end RA-2 of high-tension fuse and another exit of distribution transformer high pressure winding C ' link, RB-2 and another exit of high pressure winding A ' link, RC-2 and another exit of distribution transformer high pressure winding B ' link, promptly constitute three high pressure winding WA1 of distribution transformer, WB1, WC1 and three high-tension fuse RA, RB, RC constitutes three ' high pressure phase arms ' respectively, and is that the unit is connected into the D shape mode of connection with ' high pressure phase arm '.Three-phase high voltage UA, UB, UC are connected on RA-2, RB-2, RC-2 end respectively.
Advantage of the present invention:
(1) has the advantage that three-phase voltage is not interfered with or disturb each other.Promptly owing to fault, fault phase high-tension fuse one phase or two-phase fuse, and the non-fault of low pressure still can keep the rated voltage operation mutually.
Theory analysis is as follows:
When a phase high-tension fuse RA1 hindered fusing for some reason, A phase magnetic post lost exciting current, and it no longer is zero that B post, C post magnetic flux synthesize.Because the three-phase and five-pole magnetic structure can circulate the zero sequence magnetic flux, the triangle loop that constitutes owing to the high pressure winding is opened simultaneously, zero-sequence current can't circulate and lose demagnetizing effect, so residual voltage exists, this moment, the zero sequence magnetic flux mainly became the loop by two side columns, if not fusing of low-tension fuse, at this moment fault phase load electric current is degaussing, thereby the magnetic flux of fault phase magnetic circuit A post is very little, and the voltage that induces is very low, and measured result only is about 5% of a rated voltage.If during low-tension fuse fusing, fault phase (A phase) becomes zero load, owing to there is not the demagnetizing effect of load current, thereby fault phase magnetic circuit A post can be shunted the zero sequence magnetic flux, because the existence of two side columns, the zero sequence magnetic flux of A post shunting is very limited, and the voltage U a that is induced is far below rated voltage, owing to be unloaded, thus to load without any harm.No matter whether fault phase low-tension fuse fuses, and perfects the phase magnetic flux and still keeps specified running status.Low-pressure side Ub, Uc still can export with load voltage value, have three characteristics of not interfering with or disturb each other mutually.
When high-tension fuse RA1 and RB1 hinder when fusing simultaneously for some reason, A mutually with B mutually the magnetic post lose exciting current, C post magnetic flux is non-vanishing, because the three-phase and five-pole magnetic structure can circulate the zero sequence magnetic flux, the triangle loop that constitutes owing to the high pressure winding is opened simultaneously, zero-sequence current can't circulate and lose demagnetizing effect, so residual voltage exists, this moment, the zero sequence magnetic flux mainly became the loop by two side columns, if low-tension fuse is fusing not, at this moment fault phase load electric current is degaussing, thereby the magnetic flux of fault phase magnetic circuit A post and B post is very little, the voltage that induces is very low, and real side result only is about 5% of a rated voltage.If low-tension fuse fuses, fault phase (A mutually and B mutually) becomes zero load, because the existence of two side columns, the A post is very limited with the zero sequence magnetic flux of B post shunting, and voltage U a that is responded to and Ub be far below rated voltage, owing to being zero load, to load without any harm.No matter whether fault phase low-tension fuse fuses, and perfects the phase magnetic flux and still keeps specified running status.Low-pressure side Uc still can export with load voltage value, has the advantages that three-phase voltage is not interfered with or disturb each other mutually.
(2), can farthest tolerate three-phase imbalance load.
Because of the existence in D shape loop, high-pressure side, wherein can pass through zero-sequence current, guarantee that low-pressure side yn mid point can displacement, even a phase load electric current is arranged near under zero the uncompensated load operating mode, the low-pressure side three-phase is all still kept under the rated voltage and is moved.
(3), mains by harmonics is had from the inhibition ability.
Because of the high-pressure side is the wiring of D shape, can eliminate all zero sequence character influence of harmonic in the electrical network.
(4), be applicable to the electric power system of various earthing modes, can both have above-mentioned advantage.
Description of drawings:
Fig. 1, a kind of principle assumption diagram of distribution transformer
Fig. 2, a kind of key wiring diagram of power distribution network
Fig. 3, the power distribution network key wiring diagram of embodiment 2
Fig. 4, the power distribution network key wiring diagram of embodiment 3
Fig. 5, the power distribution network key wiring diagram of embodiment 4
Among the figure: 1---the exit of high pressure winding head end
2---the exit of high pressure winding tail end
3---the post magnetic structure
4---insulation, shell
5---the exit of low pressure winding
6---insulator pin
7---support
←---the high pressure inlet wire
Below the invention will be further described with embodiment.
Has distribution transformer on the post of five post core constructions and six exits of high pressure winding with above-mentioned oil immersed type, be equipped with three outdoor drop-out type high-tension fuse RA, RB, RC, press the key wiring diagram wiring of Fig. 2, promptly become the power distribution network that a kind of three-phase voltage is not interfered with or disturb each other mutually.Its low-pressure side is that four exit a, b, c, n from distribution transformer are connected to user Za, Zb, Zc, and promptly low-pressure side is the distribution system of the three-phase and four-line of Yn connection.Its high-pressure side wiring is that an end RA-1 of high-tension fuse, RB-1, RC-1 are linked with three exit A, B, C of distribution transformer high pressure winding respectively, the other end RA-2 of high-tension fuse and another exit of distribution transformer high pressure winding C ' link, RB-2 and another exit of high pressure winding A ' link, RC-2 and another exit of distribution transformer high pressure winding B ' link, and three-phase high voltage UA, UB, UC are connected on RA-2, RB-2, RC-2 end respectively.Three high pressure winding WA1, WB1, WC1 and three high-tension fuse RA, RB, RC of promptly constituting distribution transformer constitute three ' high pressure phase arms ' respectively, and are that the unit is connected into the D shape mode of connection with ' high pressure phase arm '.The voltage U A of high pressure inlet wire, UB, UC are connected on RA-2, RB-2, RC-2 place respectively.
Above mode of connection promptly is D, and yn11 is present most preferred connection deck label.
More present embodiment is applied in to have and locates than long user idle time because of the no-load loss of amorphous alloy distribution transformer is very little.
Embodiment 4, are the principle modes of connection of a kind of power distribution network shown in Fig. 5, and it is that every phase is furnished with 2 high-voltage explosion fuse RA1 and RA2 at least with five posts volume dry type (or oil immersion) distribution transformer unshakable in one's determination; RB1 and RB2; RC1 and RC2; Wherein RA1, RB1, RC1 have overload time-delay operating chacteristics, and they are serially connected in the exit of high pressure winding WA1, WB1, WC1 respectively, that is: RA1-1 is connected with A; RA2-1 with; RB1-1 is connected with B; RC1-1 is connected with C, also forms A high pressure phase arm mutually with regard to RA1 and WA1; RB1 forms B high pressure phase arm mutually with WB1; RC1 forms C high pressure phase arm mutually with WC1; Again RC1-2 is connected with B '; RB1-2 is connected with A '; RA1-2 is connected with C '; Constitute the D form height and press side joint line mode.Again RA2-1 is connected with RA1-2; RB2-1 is connected with RB1-2; RC2-1 is connected with RC1-2, and the high voltage UA of high pressure inlet wire is connected to RA2-2; UB is connected to RB2-2; UC is connected to RC2-2.This connection helps the protection of the inner phase fault of distribution transformer.Its low-pressure side and previous embodiment are identical.
Claims (5)
1. a distribution transformer is wound with three high pressure winding WA1, WB1, WC1 and low pressure winding WA2, WB2, WC2 respectively on its three-phase magnetic circuit; Three tail end WA2-x, WB2-y, WC2-z of low pressure winding are connected to each other, and draw WA2-a from the n exit
, WB2-b
, WC2-c
Three head ends are drawn from a, b, c exit respectively, three head end WA1-A of high pressure winding
, WB1-B
, WC1-C
Be to draw from A, B, C exit, it is characterized in that: it has the three-phase and five-pole magnetic structure, and three tail end WA1-X, WB1-Y, the WC1-Z of its high pressure winding also draw from A ', B ', C ' exit respectively.
2. distribution mode of connection, it comprises distribution transformer and air-insulated high-tension fuse, its low-pressure side is from four exit a of distribution transformer, b, c, the n place is connected to the user, it is characterized in that: its distribution transformer is the described distribution transformer of claim 1, its high-pressure side wiring is the end RA-1 with high-tension fuse, RB-1, RC-1 respectively with three exit A of distribution transformer high pressure winding, B, C links, constitute three " high pressure phase arms ", and be the unit with " high pressure phase arm ", be connected into the D shape mode of connection, high, low-pressure side can be formed the optimum joint group label D that is equivalent to transformer, the mode of connection of yn11.
3. a kind of distribution mode of connection as claimed in claim 2, it is characterized in that: have 2 air-insulated high-tension fuse RA1 and RA2, RB1 and RB2, RC1 and RC2 in each " high pressure phase arm " at least, they are serially connected in respectively on two exits of high pressure winding WA1, WB1, WC1.
4. a kind of distribution mode of connection as claimed in claim 2, it is characterized in that: have 2 air-insulated high-tension fuse RA1 and RA2, RB1 and RB2, RC1 and RC2 at least in mutually every, wherein RA1, RB1, RC1 are connected in series with the exit of high pressure winding WA1, WB1, WC1, constitute three " high pressure phase arms " and be that the unit is connected into D shape loop with it, another high-tension fuse RA2, RB2 and RC2 are serially connected in respectively between three tops and three-phase high-voltage end of incoming cables in D shape loop.
What 5. as claim 2 or 3 or 4 described a kind of distribution mode of connections, it is characterized in that: can take in the system of neutral grounding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98120080 CN1124625C (en) | 1998-10-06 | 1998-10-06 | Electric distribution transformer and distribution connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98120080 CN1124625C (en) | 1998-10-06 | 1998-10-06 | Electric distribution transformer and distribution connection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1250217A true CN1250217A (en) | 2000-04-12 |
| CN1124625C CN1124625C (en) | 2003-10-15 |
Family
ID=5226591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98120080 Expired - Fee Related CN1124625C (en) | 1998-10-06 | 1998-10-06 | Electric distribution transformer and distribution connection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1124625C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169749A (en) * | 2011-01-26 | 2011-08-31 | 中电电气(江苏)股份有限公司 | Low-zero-sequence-resistance slow-harmonic energy-saving transformer |
| CN103178451A (en) * | 2013-04-23 | 2013-06-26 | 山东中奥电力设备有限公司 | Miniature power grid terminal transformation and distribution system |
| CN103968777A (en) * | 2013-01-31 | 2014-08-06 | 奥林巴斯株式会社 | Inner surface shape measuring apparatus |
| CN105896542A (en) * | 2016-06-12 | 2016-08-24 | 山西济达变压器有限公司 | 35kV/10kV pre-assembled integrated intelligent substation |
| CN105958354A (en) * | 2016-06-12 | 2016-09-21 | 山西济达变压器有限公司 | 110kV/10kV and 110kV/35kV two pre-installed integrated intelligent substations |
| CN110794226A (en) * | 2019-10-08 | 2020-02-14 | 云南电力技术有限责任公司 | Method and device for judging fused phase in three-phase three-column type distribution transformer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101667485A (en) * | 2008-09-02 | 2010-03-10 | 上海市电力公司 | Buried distribution transformer |
-
1998
- 1998-10-06 CN CN 98120080 patent/CN1124625C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169749A (en) * | 2011-01-26 | 2011-08-31 | 中电电气(江苏)股份有限公司 | Low-zero-sequence-resistance slow-harmonic energy-saving transformer |
| CN102169749B (en) * | 2011-01-26 | 2013-02-13 | 中电电气(江苏)股份有限公司 | Low-zero-sequence-resistance slow-harmonic energy-saving transformer |
| CN103968777A (en) * | 2013-01-31 | 2014-08-06 | 奥林巴斯株式会社 | Inner surface shape measuring apparatus |
| CN103178451A (en) * | 2013-04-23 | 2013-06-26 | 山东中奥电力设备有限公司 | Miniature power grid terminal transformation and distribution system |
| CN103178451B (en) * | 2013-04-23 | 2016-07-20 | 山东中奥电力设备有限公司 | A kind of small-sized transformation and distribution system of electric network terminal |
| CN105896542A (en) * | 2016-06-12 | 2016-08-24 | 山西济达变压器有限公司 | 35kV/10kV pre-assembled integrated intelligent substation |
| CN105958354A (en) * | 2016-06-12 | 2016-09-21 | 山西济达变压器有限公司 | 110kV/10kV and 110kV/35kV two pre-installed integrated intelligent substations |
| CN105958354B (en) * | 2016-06-12 | 2018-08-31 | 山西济达变压器有限公司 | Two kinds of prepackage type integrated intelligent substations of 110kV/10kV and 110kV/35kV |
| CN105896542B (en) * | 2016-06-12 | 2019-04-26 | 山西济达变压器有限公司 | A kind of 35kV/10kV prepackage type integrated intelligent substation |
| CN110794226A (en) * | 2019-10-08 | 2020-02-14 | 云南电力技术有限责任公司 | Method and device for judging fused phase in three-phase three-column type distribution transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1124625C (en) | 2003-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7193338B2 (en) | Method for tapping a high voltage transmission line and substation using the same | |
| CN103004047B (en) | For distributed power generation power supply provides the system and method for arc fault and/or earth fault protection | |
| CN101888070B (en) | 10KV bypass cable operation method | |
| CN110544580A (en) | Main transformer and boosting system of offshore wind power plant boosting station | |
| CN1250217A (en) | Electric distribution transformer and distribution connection method | |
| CN1200585A (en) | Three phase non-disturbed type distribution transformer and switching combination arrangement | |
| CN204835331U (en) | Integration intelligence combination transformer substation | |
| CN208890339U (en) | A kind of medium-voltage distribution circuit short trouble self-healing cabinet | |
| Habashi et al. | The design of a 200 MW interphase power controller prototype | |
| CN206976140U (en) | Minimize outdoor three-phase anti-ferromagnetic resonance voltage transformer | |
| IEEE Power Systems Relaying Committee | Automatic reclosing of transmission lines | |
| CN101796702B (en) | Method and system for limiting a current in an alternating current generator | |
| CN211089136U (en) | 6kV house service power interconnection device | |
| Sporn et al. | Five years' experience with ultrahigh-speed reclosing of high-voltage transmission lines | |
| CN206421907U (en) | A kind of combination transformer voltage cell machine body structure | |
| Cunningham | AC network centennial: Years of distribution networks [History] | |
| Milton et al. | Tennessee Valley Authority's 500-kY System-Step-Down Substation Design | |
| CN220138085U (en) | Three-phase double-winding transformer inlet wire arrangement structure | |
| CN2567839Y (en) | Prize mobile box type electric drilling machine power supply device | |
| CN217134187U (en) | Novel full-self-protection three-phase power balance transformer | |
| CN2280376Y (en) | Distribution transformer and switch combination arrangement with its three phases not of interference | |
| CN2314497Y (en) | Transformer switch assembly | |
| CN1051373C (en) | Distribution and changing high voltage meter without high voltage mutual inductor | |
| CN2727946Y (en) | An electric leakage switch | |
| Huang et al. | Sishui No. 2 Main Transformer Winding Fault Analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20000412 Assignee: Shandong ZhongAo Electricity Equipment Co., Ltd. Assignor: Shanghai Mingyu Science & Technology Development Co., Ltd. Contract record no.: 2013370000161 Denomination of invention: Remote monitoring device and remote monitoring method of distribution transformer Granted publication date: 20031015 License type: Exclusive License Record date: 20130711 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Shanghai Mingyu Science & Technology Development Co., Ltd. Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Shanghai Mingyu Science & Technology Development Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031015 Termination date: 20161006 |