CN205123273U - Mine -used flameproof high pressure reactive power automatic compensation device - Google Patents
Mine -used flameproof high pressure reactive power automatic compensation device Download PDFInfo
- Publication number
- CN205123273U CN205123273U CN201520981644.3U CN201520981644U CN205123273U CN 205123273 U CN205123273 U CN 205123273U CN 201520981644 U CN201520981644 U CN 201520981644U CN 205123273 U CN205123273 U CN 205123273U
- Authority
- CN
- China
- Prior art keywords
- reactive power
- secondary coil
- power automatic
- current transformer
- phase
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model provides a mine -used flameproof high pressure reactive power automatic compensation device, relates to flame -proof type high pressure reactive power automatic compensation technical field. In order to solve present reactive compensation product connection in series -parallel resonance taking place easily, do not have the harmonic of suppression ability, can't compensate the scheduling problem voluntarily accurate. The high pressure generating line connects gradually three -phase isolator, voltage transformer, current transformer, arrester, reactive power automatic compensation branch road no. 1 and a reactive power automatic compensation branch road no. 2, high -pressure generating line is connected to vacuum contactor's one end, and vacuum contactor establishes ties with high -tension fuse, condenser and reactor in proper order, constitutes the reactive power automatic compensation branch road. The utility model discloses having and preventing that the harmonic from enlargeing, absorbing some harmonic current's function, can restrain closes a floodgate shoves and restraines the harmonic, prevents that condenser and device from establishing ties, the parallel resonance, and controller intelligent control vacuum contactor drops into or the excision condenser. The utility model is suitable for a colliery underground power supply system's reactive power compensation.
Description
Technical field
The utility model relates to flameproof high-voltage reactive power automatic compensation technical field.
Background technology
Current China's coal-mine underground power supply system ubiquity two large problems, one be combine adopt, combine pick and transportation system's high power motor because power supply distance is far away, pressure drop is large, cause difficulty in starting, affect enterprise and normally produce.Two is that reactive loss is large, and electricity waste is quite serious, affects Business Economic Benefit.Its one of the main reasons is the reactive power that produces of inductive load and the power factor that causes reduces.Power factor in each underground low voltage power system is generally between 0.5 ~ 0.7, and make line loss large, end voltage is on the low side, terminal voltage does not reach rated value, and load is large in addition, very difficult during formation motor start-up, even cause overcurrent, under-voltage top lock accident.
How to solve the power problem such as voltage drop, line loss and protection misoperation that causes of the long distance of underground coal mine and become the common problem that each large mining listed corporations is badly in need of solving; especially the demand of some large-scale type of production mines is anxious is urgent; because original type of production mine majority is 6kV electric power system; compared with now newly-built 10kV electric power system; power supply quality is relatively poor, and it is very general that larger phenomenon falls in terminal voltage.Carrying out reactive power compensation to system end is solve voltage drop problem the most effective way, dynamically (automatically) reactive power compensator technology is very ripe for present state inner high voltage, apply widely at ground transformer substation, but be still in space state at home for the flameproof high-voltage reactive power compensation device under underground coal mine particular surroundings.
The compensation technique majority of current domestic employing is static, namely all with electromagnetic type A.C. contactor for fling-cut switch is directly extremely thrown on electrical network.Restrict owing to bearing the factors such as the ability of shoving, discharge time, useful life by capacitor, there are the following problems:
1, there is no series reactor or only have very little current limiting reactor, easily causing capacitor and Cascade System, parallel resonance, cause capacitor overcurrent or overvoltage, accident of blasting, causing total lock to trip, even burn miscellaneous equipment;
2, do not possess harmonic inhabitation ability, have in system much as the power electronic equipments such as frequency converter a large amount of harmonic currents of producing can enter in capacitor, cause capacitor over-current, overvoltage, capacitor damaged;
3, because be fix extremely to throw on electrical network, along with the frequent variations of load will inevitably produce overcompensation phenomenon, thus supply voltage is caused to raise and damage electric equipment.
Utility model content
The utility model in order to solve existing reactive power compensation product, series parallel resonance easily occurring, not having harmonic inhabitation ability, the problem such as automatic accurately cannot to compensate, also be the problem that normally cannot use under underground coal mine particular surroundings to solve like product, thus mining flame-proof type high voltage reactive power automatic compensator is provided.
A kind of mining flame-proof type high voltage reactive power automatic compensator described in the utility model, comprises three-phase isolation switch, current transformer, single-phase fuse, voltage transformer, lightning arrester, reactive power automatic compensation branch road one, reactive power automatic compensation branch road two, No. two current transformers, controller and electric capacity protectors;
High voltage bus connects three-phase isolation switch, voltage transformer, current transformer, lightning arrester, reactive power automatic compensation branch road one and a reactive power automatic compensation branch road two successively;
Three-phase isolation switch is connected on high voltage bus, the primary side of voltage transformer connects A phase and the C phase of high voltage bus respectively by single-phase fuse, the secondary side of voltage transformer comprises two coils, the line voltage sampling end of the two ends connection control device of a voltage transformer secondary side coil, the control power end of the two ends connection control device of another coil of voltage transformer secondary side, controller and electric capacity protector share one and control power end;
A current transformer comprises current transformer TA1, current transformer TA2, current transformer TA3 summation current transformer TA4,
Current transformer TA1 summation current transformer TA2 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA2 of current transformer TA1 all connect the measurement current terminal of electric capacity protector,
Current transformer TA3 summation current transformer TA4 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA4 of current transformer TA3 all connect the protective current end of electric capacity protector;
One end of lightning arrester connects high voltage bus, the other end ground connection of lightning arrester;
Reactive power automatic compensation branch road one comprises vacuum contactor, high-tension fuse, capacitor, reactor and discharge coil;
One end of vacuum contactor connects high voltage bus, and vacuum contactor, high-tension fuse, capacitor and reactor are connected successively,
Discharge coil comprises primary coil L1, primary coil L2, primary coil L3, secondary coil L4, secondary coil L5, secondary coil L6, secondary coil L7, secondary coil L8 and secondary coil L9,
Primary coil L1 is in parallel with the series arm of the capacitor be connected in high voltage bus A phase and reactor, primary coil L2 is in parallel with the series arm of the capacitor be connected in high voltage bus B phase and reactor, primary coil L3 is in parallel with the series arm of the capacitor be connected in high voltage bus C phase and reactor
Primary coil L1, secondary coil L4 and secondary coil L5 are coupling on same iron core,
Primary coil L2, secondary coil L6 and secondary coil L7 are coupling on same iron core,
Primary coil L3, secondary coil L8 and secondary coil L9 are coupling on same iron core,
The capacitor bank voltage that the two ends of secondary coil L4, the two ends of secondary coil L6 are all connected electric capacity protector with the two ends of secondary coil L8 detects 1 end,
Secondary coil L5, secondary coil L7 and secondary coil L9 connect successively, and the two ends after series connection connect residual voltage 1 end of electric capacity protector,
The structure of reactive power automatic compensation branch road two is identical with the structure of reactive power automatic compensation branch road one,
The two ends of the secondary coil L4 in reactive power automatic compensation branch road two, the two ends of secondary coil L6 and the two ends of secondary coil L8 are all connected voltage detecting 2 end of electric capacity protector;
Two ends after secondary coil L5 in reactive power automatic compensation branch road two, secondary coil L7 connect with secondary coil L9 are connected residual voltage 2 end of electric capacity protector;
Electric current in No. two current transformer induction main switch cabinets, the power network current sampling end of the output connection control device of No. two current transformers,
The control signal output of controller connects the control signal input of vacuum contactor.
The utility model is by controller real-time sampling net side power factor, vacuum contactor is as the switching device of capacitor, automatically capacitor switching is carried out according to power system reactive power and power factor requirements, self compensating system reactive power, guarantee that network system has higher power factor all the time, prevent the generation of overcompensation phenomenon; Reactor is connected with capacitor, has the function preventing Harmonics amplification, absorption portion harmonic current, can suppress inrush phenomenon and harmonic inhabitation, prevents capacitor and device series, parallel resonance; Controller is based on " instantaneous power theory " control algolithm, there is full Chinese display interface, various data are complete, clear, accurate, especially in harmonic detecting, not only can to overflow data by the total harmonic voltage distortion of detection display, and each harmonic voltage, harmonic current numerical value showing with coordinate diagram and form two kinds of modes can be detected.The running status of electric capacity protector Real-Time Monitoring capacitor, has overvoltage, under-voltage, the defencive function such as residual voltage, overcurrent and quick-break.Consider the impact that underground coal mine dispels the heat on capacitor, reactor on the particular/special requirement of flame proof and this structure, improve underground coal mine supply network power supply quality, improve supply network end voltage, alleviate the problem that down-hole long-distance transmissions pressure drop is large.Device reliability described in the utility model is high, is more suitable in underground coal mine environmental applications.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of the mining flame-proof type high voltage reactive power automatic compensator described in embodiment one.
Fig. 2 is the front view of the mining flame-proof type high voltage reactive power automatic compensator described in embodiment one.
Fig. 3 is the right view of Fig. 2.
Embodiment
Embodiment one: illustrate present embodiment referring to figs. 1 through Fig. 3, a kind of mining flame-proof type high voltage reactive power automatic compensator described in present embodiment, comprises three-phase isolation switch 1, current transformer 2, single-phase fuse 3, voltage transformer 4, lightning arrester 5, reactive power automatic compensation branch road one, reactive power automatic compensation branch road two, No. two current transformers 11, controller 12 and electric capacity protectors 13;
High voltage bus connects three-phase isolation switch 1, voltage transformer 4, current transformer 2, lightning arrester 5, reactive power automatic compensation branch road one and a reactive power automatic compensation branch road two successively;
Three-phase isolation switch 1 is connected on high voltage bus, the primary side of voltage transformer 4 connects A phase and the C phase of high voltage bus respectively by single-phase fuse 3, the secondary side of voltage transformer 4 comprises two coils, the line voltage sampling end of the two ends connection control device 12 of a voltage transformer 4 secondary side coil, the control power end of the two ends connection control device 12 of another coil of voltage transformer 4 secondary side, controller 12 shares one with electric capacity protector 13 and controls power end;
A current transformer 2 comprises current transformer TA1, current transformer TA2, current transformer TA3 summation current transformer TA4,
Current transformer TA1 summation current transformer TA2 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA2 of current transformer TA1 all connect the measurement current terminal of electric capacity protector 13,
Current transformer TA3 summation current transformer TA4 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA4 of current transformer TA3 all connect the protective current end of electric capacity protector 13;
One end of lightning arrester 5 connects high voltage bus, the other end ground connection of lightning arrester 5;
Reactive power automatic compensation branch road one comprises vacuum contactor 6, high-tension fuse 7, capacitor 8, reactor 9 and discharge coil 10;
One end of vacuum contactor 6 connects high voltage bus, and vacuum contactor 6, high-tension fuse 7, capacitor 8 and reactor 9 are connected successively,
Discharge coil 10 comprises primary coil L1, primary coil L2, primary coil L3, secondary coil L4, secondary coil L5, secondary coil L6, secondary coil L7, secondary coil L8 and secondary coil L9,
Primary coil L1 is in parallel with the series arm of the capacitor 8 be connected in high voltage bus A phase and reactor 9, primary coil L2 is in parallel with the series arm of the capacitor 8 be connected in high voltage bus B phase and reactor 9, primary coil L3 is in parallel with the series arm of the capacitor 8 be connected in high voltage bus C phase and reactor 9
Primary coil L1, secondary coil L4 and secondary coil L5 are coupling on same iron core,
Primary coil L2, secondary coil L6 and secondary coil L7 are coupling on same iron core,
Primary coil L3, secondary coil L8 and secondary coil L9 are coupling on same iron core,
The capacitor bank voltage that the two ends of secondary coil L4, the two ends of secondary coil L6 are all connected electric capacity protector 13 with the two ends of secondary coil L8 detects 1 end,
Secondary coil L5, secondary coil L7 and secondary coil L9 connect successively, and the two ends after series connection connect residual voltage 1 end of electric capacity protector 13,
The structure of reactive power automatic compensation branch road two is identical with the structure of reactive power automatic compensation branch road one,
The two ends of the secondary coil L4 in reactive power automatic compensation branch road two, the two ends of secondary coil L6 and the two ends of secondary coil L8 are all connected voltage detecting 2 end of electric capacity protector 13;
Two ends after secondary coil L5 in reactive power automatic compensation branch road two, secondary coil L7 connect with secondary coil L9 are connected residual voltage 2 end of electric capacity protector 13;
The electric current in main switch cabinet responded to by No. two current transformers 11, the power network current sampling end of the output connection control device 12 of No. two current transformers 11,
The control signal output of controller 12 connects the control signal input of vacuum contactor 6.
Voltage transformer 4 provides power supply for electric capacity protector 13 and controller 12.The current signal of No. two current transformers 11 in the line voltage of controller 12 real-time sampling high voltage bus and main switch cabinet, Based Intelligent Control vacuum contactor 6 drops into or excises capacitor 8, carries out auto-compensation to electrical network.Electric capacity protector 13 can the secondary current signal of a real-time sampling current transformer 2 and the secondary voltage signal of discharge coil 10, and the running status of monitoring capacitor 8, has overvoltage, under-voltage, the defencive function such as residual voltage, overcurrent and quick-break.
Embodiment two: present embodiment is described further a kind of mining flame-proof type high voltage reactive power automatic compensator described in embodiment one, in present embodiment, controller 12 also for sampling to the switching signal of vacuum contactor 6 and capacitor faults signal, and carries out the action of fault interlocking.
Embodiment three: present embodiment is described further a kind of mining flame-proof type high voltage reactive power automatic compensator described in embodiment one or two; in present embodiment; electric capacity protector 13 also for sampling to the switching signal of vacuum contactor 6 and smog alarm fault-signal, and carries out the action of fault interlocking.
Embodiment four: present embodiment is described further a kind of mining flame-proof type high voltage reactive power automatic compensator described in embodiment three; in present embodiment; also comprise flame-proof type housing 14, three-phase isolation switch 1, current transformer 2, single-phase fuse 3, voltage transformer 4, lightning arrester 5, reactive power automatic compensation branch road one, reactive power automatic compensation branch road two, No. two current transformers 11, controller 12 and electric capacity protectors 13 are positioned in flame-proof type housing 14.
Embodiment five: present embodiment is described further a kind of mining flame-proof type high voltage reactive power automatic compensator described in embodiment one or four, in present embodiment, the reactance Rate of reactor 9 is 0.1% ~ 1.0%, 4.5% ~ 5% or 12%.
According to standard GB/T 50227 " Code for design of installation of shunt capacitors " regulation, the reactance Rate of reactor 9 has following available: when only shoving for restriction, reactance Rate should get 0.1% ~ 1.0%; During for harmonic inhabitation, according to parallel capacitor device access electrical network place background harmonics content measured value select, when background harmonics be 5 times and above time, should 4.5% ~ 5% be got, when background harmonics be 3 times and above time, should 12% be got.
The above embodiment is only preferred embodiment of the present utility model, be not limited to the utility model, although be described in detail the utility model with reference to previous embodiment, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.All within spirit of the present utility model and principle, any amendment done, equivalent replace, improve or be directly or indirectly used in other relevant technical fields, be all in like manner included in protection range of the present utility model.
Claims (5)
1. a mining flame-proof type high voltage reactive power automatic compensator, it is characterized in that, comprise three-phase isolation switch (1), current transformer (2), single-phase fuse (3), voltage transformer (4), lightning arrester (5), reactive power automatic compensation branch road one, reactive power automatic compensation branch road two, No. two current transformers (11), controller (12) and an electric capacity protector (13);
High voltage bus connects three-phase isolation switch (1), voltage transformer (4), current transformer (2), lightning arrester (5), reactive power automatic compensation branch road one and a reactive power automatic compensation branch road two successively;
Three-phase isolation switch (1) is connected on high voltage bus, the primary side of voltage transformer (4) connects A phase and the C phase of high voltage bus respectively by single-phase fuse (3), the secondary side of voltage transformer (4) comprises two coils, the line voltage sampling end at two ends connection control device (12) of voltage transformer (4) secondary side coil, the control power end at two ends connection control device (12) of voltage transformer (4) another coil of secondary side, controller (12) shares one with electric capacity protector (13) and controls power end;
A current transformer (2) comprises current transformer TA1, current transformer TA2, current transformer TA3 summation current transformer TA4,
Current transformer TA1 summation current transformer TA2 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA2 of current transformer TA1 all connect the measurement current terminal of electric capacity protector (13),
Current transformer TA3 summation current transformer TA4 responds to the electric current of high voltage bus A phase and C phase respectively, and the two ends of the two ends summation current transformer TA4 of current transformer TA3 all connect the protective current end of electric capacity protector (13);
One end of lightning arrester (5) connects high voltage bus, the other end ground connection of lightning arrester (5);
Reactive power automatic compensation branch road one comprises vacuum contactor (6), high-tension fuse (7), capacitor (8), reactor (9) and discharge coil (10);
One end of vacuum contactor (6) connects high voltage bus, and vacuum contactor (6), high-tension fuse (7), capacitor (8) and reactor (9) are connected successively,
Discharge coil (10) comprises primary coil L1, primary coil L2, primary coil L3, secondary coil L4, secondary coil L5, secondary coil L6, secondary coil L7, secondary coil L8 and secondary coil L9,
Primary coil L1 is in parallel with the series arm of the capacitor (8) be connected in high voltage bus A phase and reactor (9), primary coil L2 is in parallel with the series arm of the capacitor (8) be connected in high voltage bus B phase and reactor (9), primary coil L3 is in parallel with the series arm of the capacitor (8) be connected in high voltage bus C phase and reactor (9)
Primary coil L1, secondary coil L4 and secondary coil L5 are coupling on same iron core,
Primary coil L2, secondary coil L6 and secondary coil L7 are coupling on same iron core,
Primary coil L3, secondary coil L8 and secondary coil L9 are coupling on same iron core,
The capacitor bank voltage that the two ends of secondary coil L4, the two ends of secondary coil L6 are all connected electric capacity protector (13) with the two ends of secondary coil L8 detects 1 end,
Secondary coil L5, secondary coil L7 and secondary coil L9 connect successively, and the two ends after series connection connect residual voltage 1 end of electric capacity protector (13),
The structure of reactive power automatic compensation branch road two is identical with the structure of reactive power automatic compensation branch road one,
The two ends of the secondary coil L4 in reactive power automatic compensation branch road two, the two ends of secondary coil L6 and the two ends of secondary coil L8 are all connected voltage detecting 2 end of electric capacity protector (13);
Two ends after secondary coil L5 in reactive power automatic compensation branch road two, secondary coil L7 connect with secondary coil L9 are connected residual voltage 2 end of electric capacity protector (13);
Electric current in No. two current transformer (11) induction main switch cabinets, the power network current sampling end of the output connection control device (12) of No. two current transformers (11),
The control signal output of controller (12) connects the control signal input of vacuum contactor (6).
2. a kind of mining flame-proof type high voltage reactive power automatic compensator according to claim 1, it is characterized in that, controller (12) also for sampling to the switching signal of vacuum contactor (6) and capacitor faults signal, and carries out the action of fault interlocking.
3. a kind of mining flame-proof type high voltage reactive power automatic compensator according to claim 1 and 2; it is characterized in that; electric capacity protector (13) also for sampling to the switching signal of vacuum contactor (6) and smog alarm fault-signal, and carries out the action of fault interlocking.
4. a kind of mining flame-proof type high voltage reactive power automatic compensator according to claim 3; it is characterized in that; also comprise flame-proof type housing (14), three-phase isolation switch (1), current transformer (2), single-phase fuse (3), voltage transformer (4), lightning arrester (5), reactive power automatic compensation branch road one, reactive power automatic compensation branch road two, No. two current transformers (11), controller (12) and an electric capacity protector (13) are positioned in flame-proof type housing (14).
5. a kind of mining flame-proof type high voltage reactive power automatic compensator according to claim 1 or 4, is characterized in that, the reactance Rate of reactor (9) is 0.1% ~ 1.0%, 4.5% ~ 5% or 12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520981644.3U CN205123273U (en) | 2015-12-01 | 2015-12-01 | Mine -used flameproof high pressure reactive power automatic compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520981644.3U CN205123273U (en) | 2015-12-01 | 2015-12-01 | Mine -used flameproof high pressure reactive power automatic compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205123273U true CN205123273U (en) | 2016-03-30 |
Family
ID=55578849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520981644.3U Expired - Fee Related CN205123273U (en) | 2015-12-01 | 2015-12-01 | Mine -used flameproof high pressure reactive power automatic compensation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205123273U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937784A (en) * | 2021-10-20 | 2022-01-14 | 广东电网有限责任公司江门供电局 | Anti-harmonic low-voltage reactive power compensation device |
-
2015
- 2015-12-01 CN CN201520981644.3U patent/CN205123273U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937784A (en) * | 2021-10-20 | 2022-01-14 | 广东电网有限责任公司江门供电局 | Anti-harmonic low-voltage reactive power compensation device |
| CN113937784B (en) * | 2021-10-20 | 2023-06-27 | 广东电网有限责任公司江门供电局 | Harmonic-proof low-voltage reactive power compensation device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208788B (en) | Intelligent Dynamic power network neutral point earthing method and the complete sets of equipment | |
| CN203942275U (en) | A kind of 35kV isolated neutral power distribution network ferro resonance restraining device | |
| CN204012678U (en) | A kind of power distribution network multimode ground protection system | |
| CN205377298U (en) | High height above sea level suppresses humorous wave mode low pressure dynamic reactive power compensation device based on TSC | |
| CN102170135A (en) | 35KV large capacity reactive compensation and harmonic suppression integrated system and control method thereof | |
| CN202474853U (en) | Combined neutral point overvoltage protection device | |
| CN204835331U (en) | Integration intelligence combination transformer substation | |
| Tugay | The resonance overvoltages in EHV network | |
| CN201478821U (en) | Overvoltage protector for indirect neutral point-grounding power system in three-phase power grid | |
| CN205123273U (en) | Mine -used flameproof high pressure reactive power automatic compensation device | |
| CN117728368A (en) | Neutral point variable resistor grounding system | |
| CN104967036A (en) | Integrated intelligent combination transformer station | |
| CN208046228U (en) | Neutral point variable resistance earthed system | |
| CN203135401U (en) | AC invasion protection device for DC system of transformer substation | |
| CN206226010U (en) | Transformer neutral point protection system to earth | |
| CN201260077Y (en) | Arc extinguishing device grounded through high frequency damp element | |
| CN209119804U (en) | Electric furnace overvoltage energy absorption protective device | |
| CN102255595A (en) | Method for suppressing the DC magnetic biasing of transformer | |
| CN201388042Y (en) | Central high-voltage switch equal-height cabinet | |
| CN203135434U (en) | Neutral point virtual grounding device | |
| LIANG et al. | Research on phase-by-phase adaptive reclosing sequence for transmission lines | |
| Dong et al. | The offline accident of the large-scale wind generator system and its protection & control scheme | |
| CN203135432U (en) | Arc-resonance extinction route-selecting over-voltage protection device | |
| CN204517401U (en) | For the AC Substation preventing DC component from sealing in AC network | |
| Yan et al. | Process and Protection Action of Commissioning Fault of Offshore Wind Farm Grid-Connected Transmission Lines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20160330 Termination date: 20171201 |