CN203747436U - Distributed photovoltaic power generation access system - Google Patents
Distributed photovoltaic power generation access system Download PDFInfo
- Publication number
- CN203747436U CN203747436U CN201420129361.1U CN201420129361U CN203747436U CN 203747436 U CN203747436 U CN 203747436U CN 201420129361 U CN201420129361 U CN 201420129361U CN 203747436 U CN203747436 U CN 203747436U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- power generation
- distributed photovoltaic
- photovoltaic power
- 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 - Lifetime
Links
- 238000010248 power generation Methods 0.000 title claims abstract description 42
- 230000003111 delayed effect Effects 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000001143 conditioned effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract 2
- 230000007123 defense Effects 0.000 abstract 1
- 238000007689 inspection Methods 0.000 description 12
- 230000006837 decompression Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model relates to a distributed photovoltaic power generation access system. The distributed photovoltaic power generation access system is characterized in that the system includes a low-voltage main protection switch, a low-voltage anti-islanding device, a user main switch and a grid-connection low-voltage circuit breaker; and a power distribution transformer, the low-voltage main protection switch, the low-voltage anti-islanding device, the user main switch and the grid-connection low-voltage circuit breaker are connected with one another sequentially. With the distributed photovoltaic power generation access system of the utility model adopted, three lines of defense can be provided for the guarantee of power distribution grid and distributed photovoltaic grid-connected operation and the safety of maintenance personnel. The distributed photovoltaic power generation access system has anti-islanding protection, low-voltage lockout, voltage existence detection and automatic grid connection, voltage existence detection switching on and voltage loss tripping functions, and can assist in ensuring the safety of maintenance personal.
Description
Technical field
The utility model belongs to photovoltaic power generation grid-connecting technology, specifically will relate to a kind of distributed photovoltaic power generation connecting system.
Background technology
China is one of the abundantest country of solar energy in the world, and radiation amount is between 3.3103-8.4106kJ/m2.More than 2/3 area of a national total area year sunshine time is greater than 2000 hours.Photovoltaic generation development of resources, to optimizing China's energy resource structure, tackling and preserve the ecological environment, promote the sustainable development of socio-economy, has a very important role.Region, western China is wide, is convenient to the exploitation of centralized photovoltaic; At central and east wide geographic area, be subject to environmental condition restriction, distributed photovoltaic power generation will become the emphasis of future development, and distributed photovoltaic power generation refers in particular to employing photovoltaic module, solar energy is directly converted to the distributed generation system of electric energy.It is a kind of novel, tool generating with broad prospects for development and comprehensive utilization of energy mode, it advocates generating nearby/grid-connected/conversion nearby/principle of use nearby nearby, not only can effectively improve the energy output of same size photovoltaic plant, also efficiently solve the loss problem of electric power in boosting and transporting for long-distance simultaneously.
China's distributed photovoltaic power generation is also in the early stage of development, and relevant policies and standard also do not match, imperfection, builds and complex management, therefore furthers investigate distributed photovoltaic power generation significant.After distributed photovoltaic power generation access power distribution network, change the power supply access distributed architecture of current electrical network, power distribution network becomes the multidirectional trend structure of multiport from pure load radiativity structure, and the access of generating equipments, grid-connected, brings security risk certainly will to normal operation of power networks, Maintenance and Repair in a large number.
The most of power failure operation mode that adopts of current 380 volts of controller switching equipments maintenance, existing apparatus and operational method, lack effective means and stop user's generating equipment to the reverse power transmission situation of power failure equipments, power failure equipments is charged to cause part, and then jeopardizes operating personnel's personal safety.Meanwhile, user is inner to install after photovoltaic power generation equipment, because large multi-user lacks generating equipment operational management experience, may personal electric shock event occur because mistake drops into generating equipment.
Utility model content
For the deficiencies in the prior art, the utility model provides a kind of distributed photovoltaic power generation connecting system, can guarantee grid side generation permanent fault time, distributed photovoltaic power generation can correctly disconnect and being connected of grid side, proceed to from Running State, having solved distributed photovoltaic can not the correct problem that may jeopardize distribution O&M maintainer personal safety from net; Meanwhile, can guarantee grid side generation temporary fault time, distributed photovoltaic power generation keeps and net state waiting system recovers normal, has solved the frequent off-grid of distributed photovoltaic when voltage disturbance appears in net side and affects the problem of distributed photovoltaic power generation.The utility model system comprises low pressure general protection switch, the anti-isolated island device of low pressure, consumer main switch and grid-connected low-voltage circuit breaker.Wherein, low pressure general protection switch is positioned at distribution transformer lower end; The anti-isolated island device of low pressure is positioned at low pressure general protection switch lower end, and its lower end connects consumer main switch; Consumer main switch lower end connects grid-connected low-voltage circuit breaker, and grid-connected low-voltage circuit breaker has inspection tripping operation with no pressure, inspection has pressing lock and with no pressure/decompression long delay trip avoidance function.Grid-connected low-voltage circuit breaker in native system has inspection tripping operation with no pressure, inspection has pressing lock and with no pressure/decompression long delay trip avoidance function, and while guaranteeing system generation permanent fault, the correct disconnection of distributed photovoltaic power generation is connected with system, proceeds to from Running State; While guaranteeing system generation temporary fault, distributed photovoltaic power generation keeps and net state waiting system recovers normal.
The purpose of this utility model is to adopt following technical proposals to realize:
A kind of distributed photovoltaic power generation connecting system, its improvements are, described system comprises low pressure general protection switch, the anti-isolated island device of low pressure, consumer main switch and grid-connected low-voltage circuit breaker;
Distribution transformer, described low pressure general protection switch, the anti-isolated island device of described low pressure, described consumer main switch are connected successively with grid-connected low-voltage circuit breaker.
Preferably, described grid-connected low-voltage circuit breaker comprises breaker body, device for under-voltage releasing equipment and under-voltage time delay module.
Preferably, described device for under-voltage releasing equipment is positioned at breaker body inside; Described under-voltage time delay module is in circuit breaker outside, and its input connects detected power supply, and output connects undervoltage trip coil.
Further, described under-voltage time delay module comprises rectification circuit, voltage stabilizing circuit, capacitor energy, secondary reduction voltage circuit, voltage acquisition judging circuit, RC delay circuit, time delay rearrangeable switch and driver output circuit.
Further, described RC delay circuit is time delay conditioned circuit, and described under-voltage time delay module panel is provided with delay adjustment device.
Further, described delay adjustment device is the stepless adjustment of adjusting that can carry out any different delayed time time.
Further, described RC delay circuit can carry out the delayed setting of ultra-long time, and delay time can reach the RC delay circuit of 10s.
Compared with the prior art, the beneficial effects of the utility model are:
A kind of distributed photovoltaic power generation connecting system that the utility model provides, from guaranteeing that power distribution network and distributed photovoltaic are incorporated into the power networks and the angle of O&M maintainer safety provides three lines of defence.The first line of defence is inverter, and inverter should meet country, industry Its Relevant Technology Standards, possesses anti-island protect, low-voltage lockout, inspection and has the auto-parallel of pressure function.Second security perimeter is grid-connected professional low-voltage circuit breaker, has inspection and has pressing lock and decompression trip avoidance function.Inspection has pressing lock to recommend definite value 85%UN, and the necessary manual operation of closing a floodgate, and guarantees that generating equipment just allows and net operation under public electric wire net normal operation, and while effectively preventing controller switching equipment interruption maintenance, user misoperation is to the anti-power transmission of system.Decompression trips and recommends definite value 30%UN, and when guaranteeing public electric wire net maintenance or permanent fault occurring, the correct disconnection of distributed photovoltaic is connected with electrical network.Three lines of defence is the anti-isolated island device of the low pressure of distribution transformer low-pressure side, can change the power-balance of distributed photovoltaic power generation islanded system, destroys the condition of distributed photovoltaic power generation islet operation, realizes anti-isolated island function, guarantees upkeep operation personal safety.
Brief description of the drawings
The distributed photovoltaic power generation connecting system schematic diagram that Fig. 1 provides for the utility model;
The grid-connected low-voltage circuit breaker schematic diagram that Fig. 2 provides for the utility model;
The circuit of the under-voltage time delay module system that Fig. 3 provides for the utility model connects block diagram;
The panel of the under-voltage time delay module that Fig. 4 provides for the utility model is set schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The utility model provides a kind of distributed photovoltaic power generation connecting system; grid-connected low-voltage circuit breaker in system is realized with no pressure/decompression long delay trip avoidance function by the under-voltage time delay module of ultra-delay function; while guaranteeing system generation temporary fault; distributed photovoltaic power generation keeps and net state waiting system recovers normal; solve existing device for under-voltage releasing equipment not compared with long delay or time delay is non-adjustable can not match with system protection, cause the problem of main circuit power supply circuit breaker misoperation.Concrete technical scheme is as follows:
A kind of distributed photovoltaic power generation connecting system, comprises low pressure general protection switch, the anti-isolated island device of low pressure, consumer main switch and grid-connected low-voltage circuit breaker.
Its mesolow general protection switch is positioned at distribution transformer lower end, quick acting excision faulty line while breaking down for low-voltage circuit, and distribution transforming, low-voltage circuit interruption maintenance insulating power supply; The anti-isolated island device of low pressure comprises console switch and perturbation load, and the anti-isolated island device of low pressure is positioned at low pressure general protection switch lower end, by destroying islet operation condition, forces photovoltaic power generation equipment correctly from net, guarantees upkeep operation personal safety.The anti-isolated island device of low pressure lower end connects consumer main switch, for guaranteeing correctly to excise short trouble.Consumer main switch lower end connects grid-connected low-voltage circuit breaker, has inspection tripping operation with no pressure, inspection has pressing lock and a with no pressure/decompression long delay trip avoidance function.
Wherein, grid-connected low-voltage circuit breaker is made up of breaker body, device for under-voltage releasing equipment and under-voltage time delay module; When the trip rating of device for under-voltage releasing equipment is guaranteed system generation permanent fault, the correct disconnection of distributed photovoltaic power generation is connected with system, proceeds to from Running State; The under-voltage time delay definite value time is greater than local system prepared auto restart, reclosing and full-automatic feeder automation action maximum duration, and while guaranteeing system generation temporary fault, distributed photovoltaic power generation keeps and net state waiting system recovers normal;
Wherein, device for under-voltage releasing equipment is positioned at breaker body inside, and under-voltage time delay module is in circuit breaker outside, and its input connects detected power supply, and output connects undervoltage trip coil;
Under-voltage time delay module is by rectification circuit, voltage stabilizing circuit, capacitor energy, secondary pressure circuit, voltage acquisition judging circuit, RC delay circuit, time delay rearrangeable switch and driver output the electric circuit constitute.After voltage acquisition decision circuitry detects that input supply voltage is lower than under-voltage set point, do not close immediately the power supply output of out-put supply end by driver output circuit, carry out time delay and start RC delay circuit, if continue under-voltagely in the delay time of setting, export to setting the power supply of closing immediately output port after time delay; If voltage recovers normal value in the delay time of setting, power supply output that can powered-down output port.Can avoid frequent switch unstable due to input power and output port power supply.
Delay adjustment device is stepless adjustment, can carry out interior the adjusting of different delayed time time arbitrarily of maximum setting range; RC delay circuit can carry out the delayed setting of ultra-long time, and delay time can reach 10s.
Embodiment
As shown in Figure 1, a kind of distributed photovoltaic power generation connecting system that the utility model provides, comprises low pressure general protection switch, the anti-isolated island device of low pressure, consumer main switch and grid-connected low-voltage circuit breaker.Wherein grid-connected low-voltage circuit breaker comprises breaker body, device for under-voltage releasing equipment and under-voltage time delay module three parts.
As shown in Figure 2, grid-connected low-voltage circuit breaker possesses inspection tripping operation with no pressure and inspection has pressure closing function, trip rating 30%Un, delay time is greater than local system prepared auto restart, reclosing and full-automatic feeder automation action maximum duration, and in technical solutions of the utility model, the long delay time is 10s.When 30%Un examines definite value with no pressure and guarantees system generation permanent fault, the correct disconnection of distributed photovoltaic power generation is connected with system, proceeds to from Running State; When 10s time delay definite value can be guaranteed system generation temporary fault (comprising level power supply prepared auto restart, line fault successful reclosing etc.), distributed photovoltaic power generation keeps and net state waiting system recovers normal, improves the operational reliability of distributed photovoltaic power generation.It is 85%Un that inspection has pressing lock definite value, and is necessary for manual operation, guarantees that generating equipment just allows under system normal operation grid-connected, and while effectively preventing controller switching equipment interruption maintenance, user misoperation is to the anti-power transmission of system.
As shown in Figure 3, the embodiment of under-voltage time delay module, wherein, 1, rectification circuit, 2, voltage stabilizing circuit, 3, capacitor energy, 4, secondary reduction voltage circuit, 5, voltage acquisition judging circuit, 6, RC delay circuit, 7, time delay rearrangeable switch, 8, driver output circuit.
Be specially: rectification circuit 1 and voltage stabilizing circuit 2, the input of rectification circuit is connected to input power port, and the output V1 of electric current is connected to voltage stabilizing circuit 2; The output V2 of voltage stabilizing circuit is connected to system stored energy circuit 3, by generating V3 by secondary reduction voltage circuit after accumulator 3; V1 and V2 respectively by diode D1 and D2 phase or after be connected to driver output circuit 8; The output V1 of rectification circuit is also connected to and gathers judging circuit 5, and the output that gathers decision circuitry 5 is connected to RC delay circuit 6, and RC delay circuit 6 one end are also connected to rearrangeable switch 7; The output of RC delay circuit is connected to driver output circuit 8, and driver output circuit connects output port of power source, in order to connect the under-voltage coil of rear end.Its delay time is set by the rearrangeable switch on panel, as described in Figure 4, under-voltage delay time is adjusted by the configuration switch 10 on panel 9, can carry out interior the adjusting of different delayed time time arbitrarily of maximum setting range, and setting time can be 0.1s to the arbitrary value between 10s.
In the time that power supply input port is connected normal power source, input power is controlled power supply output by rectification circuit 1, collection decision circuitry, RC delay circuit and driving power output, can ensure the reliable adhesive of under-voltage coil to rear end, now major loop circuit breaker can reliably close a floodgate.In the time that the voltage drop of input power arrives at under-voltage, gather instantaneous the changing of output of decision circuitry 5, due to the capacitance-resistance time delay of RC delay circuit, the signal of delay circuit output can not instantaneously be changed, after the delay time of setting to rearrangeable switch, the output of RC delay circuit changes, thereby control the output of driver output circuit powered-down, but when in the under-voltage delay time of setting, input supply voltage returns on under-voltage some, can powered-down output.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not depart from any amendment of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (7)
1. a distributed photovoltaic power generation connecting system, is characterized in that, described system comprises low pressure general protection switch, the anti-isolated island device of low pressure, consumer main switch and grid-connected low-voltage circuit breaker;
Distribution transformer, described low pressure general protection switch, the anti-isolated island device of described low pressure, described consumer main switch are connected successively with grid-connected low-voltage circuit breaker.
2. a kind of distributed photovoltaic power generation connecting system as claimed in claim 1, is characterized in that, described grid-connected low-voltage circuit breaker comprises breaker body, device for under-voltage releasing equipment and under-voltage time delay module.
3. a kind of distributed photovoltaic power generation connecting system as claimed in claim 1, is characterized in that, described device for under-voltage releasing equipment is positioned at breaker body inside; Described under-voltage time delay module is in circuit breaker outside, and its input connects detected power supply, and output connects undervoltage trip coil.
4. a kind of distributed photovoltaic power generation connecting system as claimed in claim 2, it is characterized in that, described under-voltage time delay module comprises rectification circuit, voltage stabilizing circuit, capacitor energy, secondary reduction voltage circuit, voltage acquisition judging circuit, RC delay circuit, time delay rearrangeable switch and driver output circuit.
5. a kind of distributed photovoltaic power generation connecting system as claimed in claim 4, is characterized in that, described RC delay circuit is time delay conditioned circuit, and described under-voltage time delay module panel is provided with delay adjustment device.
6. a kind of distributed photovoltaic power generation connecting system as claimed in claim 5, is characterized in that, described delay adjustment device is the stepless adjustment of adjusting that can carry out any different delayed time time.
7. a kind of distributed photovoltaic power generation connecting system as claimed in claim 5, is characterized in that, described RC delay circuit can carry out the delayed setting of ultra-long time, and delay time can reach the RC delay circuit of 10s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420129361.1U CN203747436U (en) | 2014-03-21 | 2014-03-21 | Distributed photovoltaic power generation access system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420129361.1U CN203747436U (en) | 2014-03-21 | 2014-03-21 | Distributed photovoltaic power generation access system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747436U true CN203747436U (en) | 2014-07-30 |
Family
ID=51347194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420129361.1U Expired - Lifetime CN203747436U (en) | 2014-03-21 | 2014-03-21 | Distributed photovoltaic power generation access system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747436U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071439A (en) * | 2015-08-14 | 2015-11-18 | 国家电网公司 | Photovoltaic inversion single-phase AC grid-connected box |
| CN105140965A (en) * | 2015-10-10 | 2015-12-09 | 国家电网公司 | Distributed power supply integration equipment supporting hot plug |
| CN107834591A (en) * | 2017-10-24 | 2018-03-23 | 国家电网公司 | Public line distributed power supply smart management system |
| CN107834607A (en) * | 2017-12-17 | 2018-03-23 | 无锡优耐特能源科技有限公司 | A kind of distribution box for photovoltaic plant |
| CN108832893A (en) * | 2018-06-20 | 2018-11-16 | 阳光电源股份有限公司 | Photovoltaic module cutoff device, shutdown control method and intelligent assembly |
| CN110033966A (en) * | 2019-04-20 | 2019-07-19 | 国网湖北省电力有限公司咸宁供电公司 | Decompression suspension blocking device |
| CN110165786A (en) * | 2019-06-12 | 2019-08-23 | 国网安徽省电力有限公司合肥供电公司 | A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system |
-
2014
- 2014-03-21 CN CN201420129361.1U patent/CN203747436U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071439A (en) * | 2015-08-14 | 2015-11-18 | 国家电网公司 | Photovoltaic inversion single-phase AC grid-connected box |
| CN105071439B (en) * | 2015-08-14 | 2017-08-15 | 国家电网公司 | Photovoltaic inversion single phase ac grid connection box |
| CN105140965A (en) * | 2015-10-10 | 2015-12-09 | 国家电网公司 | Distributed power supply integration equipment supporting hot plug |
| CN107834591A (en) * | 2017-10-24 | 2018-03-23 | 国家电网公司 | Public line distributed power supply smart management system |
| CN107834607A (en) * | 2017-12-17 | 2018-03-23 | 无锡优耐特能源科技有限公司 | A kind of distribution box for photovoltaic plant |
| CN108832893A (en) * | 2018-06-20 | 2018-11-16 | 阳光电源股份有限公司 | Photovoltaic module cutoff device, shutdown control method and intelligent assembly |
| CN108832893B (en) * | 2018-06-20 | 2021-12-10 | 阳光电源股份有限公司 | Photovoltaic module turn-off device, turn-off control method and intelligent module |
| CN110033966A (en) * | 2019-04-20 | 2019-07-19 | 国网湖北省电力有限公司咸宁供电公司 | Decompression suspension blocking device |
| CN110165786A (en) * | 2019-06-12 | 2019-08-23 | 国网安徽省电力有限公司合肥供电公司 | A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203747436U (en) | Distributed photovoltaic power generation access system | |
| CN103124068B (en) | A kind of anti-island protect system of distributed power generation grid-connected system and guard method thereof | |
| CN102055368A (en) | 100-KVA micro-grid energy storage bidirectional converter | |
| CN203312781U (en) | Integrated anti-islanding protection system for distributed power generation | |
| CN112366809B (en) | Pilot plant spare power automatic switching device with new forms of energy | |
| CN210780230U (en) | Switch device for switching high power from off-grid to grid-connected | |
| KR101336042B1 (en) | Emergency power system with the solar system | |
| CN103825363B (en) | A kind of wind-light storage low pressure micro-capacitance sensor group protection coordination controller | |
| CN113241844A (en) | 10kV bus sectional spare power automatic switching method and device | |
| CN103296696A (en) | Inverter and method for controlling same | |
| CN202127283U (en) | Circuit backup power automatic switching protection device | |
| CN103532221A (en) | Spare-power automatic switching implementation method of lines under wiring and operating modes of self-adaptive 330kV substation | |
| CN205429890U (en) | It goes up switch FTU controller to adapt to net post that joins in marriage that little power supply circuit reclosed | |
| CN203522212U (en) | Photovoltaic power station system possessing low voltage ride through and anti-island protection functions | |
| CN203312829U (en) | Inverter capable of smoothly switching between grid-off mode and grid-connected mode | |
| Glassmire et al. | Using Virtual Synchronous Generators to Resolve Microgrid Protection Challenges | |
| CN202026071U (en) | Circuit breaker malfunction protective system with automatic reclosing function | |
| CN203553882U (en) | Transformer low-voltage tripping automatic reclosing device | |
| CN206533188U (en) | A kind of FTU power source specials | |
| CN204349424U (en) | Microcomputer transformer backup protection loop | |
| CN204408004U (en) | Double loop power supply inlet wire switching device shifter | |
| CN203951255U (en) | Two the filling of the two electricity of a kind of DC power supply put | |
| CN103138383B (en) | Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method | |
| CN206542181U (en) | Intelligent non-pressure release coil controller | |
| CN104065064A (en) | Control method for a 110 kilovolt transformer substation micro-grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |