CN201091054Y - Closed loop type system intelligent electricity-saving device - Google Patents
Closed loop type system intelligent electricity-saving device Download PDFInfo
- Publication number
- CN201091054Y CN201091054Y CNU2007201191340U CN200720119134U CN201091054Y CN 201091054 Y CN201091054 Y CN 201091054Y CN U2007201191340 U CNU2007201191340 U CN U2007201191340U CN 200720119134 U CN200720119134 U CN 200720119134U CN 201091054 Y CN201091054 Y CN 201091054Y
- Authority
- CN
- China
- Prior art keywords
- electricity
- output
- bypass
- grades
- voltage
- 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
Images
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
Abstract
A closed-loop system smart power saver relates to a power-saving device for an AC electrical equipment system, particularly a smart system power-saving device of an AC electrical equipment, which can save active electrical quantity, improve the power factor, reduce the surge and restrain the harmonic interference. The structure comprises a core part, a filter part, a control part, a protection part and a communications part; the internal structure of the core part is equivalent to a group of series reactors which are connected with a surge throttling non-phase control electromagnetic transformer, attached with a group of Z-type windings; the filter part comprises an LC filter circuit; the control part comprises a detecting unit, a central processing unit, an implementing mechanism, a setting unit, a display unit and a monitoring unit; the protection part comprises a setting which is provided with a fault automatic bypass, an overflow bypass, another overflow bypass, an overheating bypass and an over-rated load bypass; the communications part comprises a communications interface. The utility model has the advantages of better energy-saving effect and safer running of internal bypasses.
Description
Technical field
The utility model relates to the battery saving arrangement to the AC electric equipment system, particularly relates to the meritorious electric weight of a kind of intelligence saving of alternating current lighting apparatus and improves power factor and the system electric power saver of minimizing surge and inhibition Harmonic Interference.
Background technology
Take a broad view of China's operation of power networks present situation, electric equipment only is operated under the good electric power environmental, its maximum operating efficiency of competence exertion.Because the development that China recent years is advanced by leaps and bounds, power consumption constantly increases, also constantly increase and complicated of power consumption equipment, and the quality of electricity consumption is also constantly paid attention to.The output voltage of power transformer generally all is higher than rated value about 10%.Can produce extra heating phenomenon when the electric power of surplus supply makes power consumption equipment, it not only causes power wastage, also can directly shorten the life-span of machine itself.Also has because the power factor of electric network that power consumption equipment itself causes is low the electric weight waste that reactive power increases; Owing to the electric current and voltage distortion that surge, high order harmonic component produce, make the efficient of power consumption equipment reduce, be exactly that the electricity charge have increased the but not increase of device fabrication value.These several reasons have not only wasted electric energy, shorten the life-span but also cause the power consumption equipment electric current to increase institute's equipment heating that is directed at, even burn, and this also is fund waste.And for example: light fixture electrical equipment generally is in rated voltage or the running of superpressure scope of peak times of power consumption.With the street lamp is example, and at the electricity consumption low peak period of the time after midnight, street lamp rises along with voltage and is in running under the superpressure environment, has both increased unnecessary electric energy loss, can shorten the street lamp life-span again.
The utility model content
For solving the above-mentioned deficiency of prior art, the utility model is according to the actual conditions of China's electric power, reduce waste of power resources to greatest extent and try one's best the raising electricity quality, real-time dynamic precision detects and the deviation of monitoring controlled volume and set-point is controlled the rational voltage magnitude of output by being undertaken by microprocessor, realize large power uninterrupted little current switching technology, and mode such as optional according to actual needs control mode at times, remote computer centralized control, really realize system intelligent.Control program is once setting, and equipment will and improve power factor according to voltage, electric current and the power of the Automatic Program regulating load of data of taking and setting, reach the purpose of electrical energy saving.
In order to arrive above-mentioned purpose, finish above-mentioned task, the utility model closed loop system intelligence electricity-saving appliance is realized like this.
Structure the utility model closed loop system intelligence electricity-saving appliance comprises core section, filtering part, control section, protection part, communications portion.
The internal structure of core section is equivalent to, and one group of series reactor connects the non-phase control type electromagnetism of a pressure regulation throttling transformer, acts on the absorption compensation loop of subduing surge on the electrical network, high order harmonic component and the Z type winding of Voltage unbalance compensation with one group;
Filtering partly comprises can reduce electromagnetic interference that load the produces LC filter circuit to the power supply influence;
Control section comprises detecting unit, CPU, actuator, setting, display unit, monitoring unit; The output of detecting unit is connected with CPU, setting, display unit input respectively; The output of setting is connected with the input of CPU, display unit respectively; The output of CPU is connected with the input of actuator, display unit respectively; The output of actuator is connected with the input of display unit, monitoring unit respectively; The output of monitoring unit is connected with the input of CPU, display unit respectively;
Protection part comprises having the fault auto by pass, over-current side path, over-current side path, cross the setting that thermal bypass, load surpass bypass when specified;
Communications portion comprises having communication interface.
Described control section has manual control and controls two kinds of program controlled modes automatically, and described two kinds of program mode (PM)s can be changed by the button on the man-computer interface.
Manually be controlled at man-computer interface and be provided with bypass with outage memory function, economize on electricity 1, economize on electricity 2,3 four driving switch that economize on electricity are pressed respective switch, terminal driving switch signal of control of corresponding output.
Automatically control has the setting of 1 grade of return value, 1 grade of operating value, 2 grades of return values, 2 grades of operating values, 3 grades of return values, 3 grades of operating values, comes automatic detection of grid power consumption parameter to control the output of each gear according to the voltage range of described each gear of setting.
1 grade of return value is that voltage is lower than this value and returns the bypass shelves;
1 grade of operating value is that voltage surpasses this value and enters 1 grade;
2 grades of return values are that voltage is lower than this value and returns 1 grade;
2 grades of operating values are that voltage surpasses this value and enters 2 grades;
3 grades of return values are that voltage is lower than this value and returns 2 grades;
3 grades of operating values are that voltage surpasses this value and enters 3 grades.
Thereby CPU is the deviation of carrying out real-time dynamic precision detection, monitoring controlled volume and set-point exports the microprocessor that rational voltage magnitude is realized large power uninterrupted little current switching technology with control.
Described microprocessor comprises sampling arithmetic element and procedure control unit:
The input of described sampling arithmetic element is connected with incoming power R, S, T through master switch QF; Another road of incoming power R, S, T process master switch QF enters La1, Lb1, the Lc1 inductance coil is held output toward U, V, W, the Na3 of coil La2, Lb2, Lc2, Nb3, Nc3 end are connected respectively with power supply output U, V, W end by bypass contactor KM1, KM2, KM3, KM4 are the gear contactor, three groups of coils form wye connection, form an electromotive force closed-loop path that makes iron core produce magnetic flux output;
Described procedure control unit output switching signal is to promote to carry out bypass contactor KM1, economize on electricity 1 contactor KM2, economize on electricity 2 contactor KM3, economize on electricity 3 contactor KM4 respectively; KM5 is that tool is guaranteed the impregnable capacitor switching contactor of terminal electricity consumption with protection output, and the one end connects ground wire, and the other end connects KA2, KA3, KA4; KA1, KA2, KA3, KA4 are the auxiliary relays of corresponding KM1, KM2, KM3, KM4.
Described procedure control unit output switching signal is to promote to carry out bypass indication H1, economize on electricity indication H2, faulty indication H3 respectively.
Compared with prior art, the utlity model has following characteristics:
1, energy-saving effect is better: movement is partly with one group of Z type compensation winding, act on and subdue surge on the electrical network, the absorption compensation loop of high order harmonic component (3,5,7 times) and the compensation of Voltage unbalance, the magnetic flux that is produced in the time of on the winding meets on the iron core of same integral body, make the mutual balance of electromagnetic potential on the three-phase core limb, induced electromotive force mean allocation after the balance makes the voltage of output obtain balance to three phase windings.The phase difference of the surge on this external power grid, high order harmonic component and electric current and voltage is interacted by coil and iron core, after handle in the absorption compensation loop, and the quality of the electricity consumption electrical network reactive loss that is greatly improved.
2, internal by-pass: when the electricity-saving appliance bypass, the Na3 of coil La2, Lb2, Lc2, Nb3, Nc3 end are connected (KM1 closure) respectively with power supply output U, V, W end, effect is can not produce the magnetic flux electromotive force when electric current during by iron core, can regard it as coil and be in open-circuit condition, so this moment, iron core can not worked.Because the internal resistance of coil La1, Lb1, Lc1 is very little, can regard bypass as, has guaranteed the continuity of output current again, end does not cut off the power supply when guaranteeing to change.
3, operation is safer: the utility model has been taked omnibearing safeguard measure, once system can auto by pass when fault is arranged, and can not make end that the outage phenomenon is arranged.
Description of drawings
Fig. 1 is the block diagram of control section of the present utility model;
Fig. 2 is the circuit diagram of the utility model core section;
Fig. 3 is the circuit diagram of the utility model filtering part;
Fig. 4 is the sampling arithmetic element of microprocessor and the circuit connection diagram of relevant elements;
Fig. 5 is the procedure control unit of microprocessor and the circuit connection diagram of relevant elements.
Embodiment
Among the figure:
The RST incoming power, the UVW power output end, the QF master switch,
La1, Lb1, Lc1, La2, Lb2, Lc2, La3, Lb3, Lc3 inductance coil,
Na1, Nb1, Nc1, Na2, Nb2, Nc2, Na3, Nb3, Nc3 contact terminal,
The KM1 bypass contactor, KM2, KM3, KM4 switching contactor (gear contactor),
The KM5 capacitor switching contactor,
KA1, KA2, KA3, KA4 auxiliary relay, H1 bypass indication, the H2 indication of economizing on electricity,
The H3 faulty indication, C1, C2, C3 capacitor.
Below, in conjunction with the accompanying drawings, introduce embodiment of the present utility model.
Core section as shown in Figure 2, the movement internal structure is equivalent to, one group of series reactor connects the non-phase control type electromagnetism of a pressure regulation throttling transformer, act on and subdue surge on the electrical network, the absorption compensation loop of high order harmonic component (3,5,7 times) and the compensation of Voltage unbalance with one group of Z type winding, the magnetic flux that is produced in the time of on the winding meets on the iron core of same integral body, make the mutual balance of electromagnetic potential on the three-phase core limb, induced electromotive force mean allocation after the balance makes the voltage of output obtain balance to three phase windings.The phase difference of the surge on this external power grid, high order harmonic component and electric current and voltage is interacted by coil and iron core, and after handled in the absorption compensation loop, the quality of electricity consumption electrical network was greatly improved.Because the electricity-saving appliance movement adopted special material of import and manufacture craft, no-load loss is less than 0.05%, class of insulation H rank.
The filtering part as shown in Figure 3, inductance L and capacitor C are formed and are equivalent to a LC filter circuit, according to EMC filter principle, it can subdue surge and harmonic component on the electrical network effectively, its reason is to have reduced or weakened that surge harmonious wavestrip exists and the reactive power consumption that causes reaches the purpose of economize on electricity from face, because be the front end that is contained in system power supply (or circuit), therefore can reduce of the influence of the electromagnetic interference of load generation, thereby reduce the transmission of system's reactive power power supply.
As shown in Figure 1, control section mainly partly is made up of electrical network electric weight detecting unit, CPU, actuator and monitoring unit and display unit.With the power consumption test section detect electrical network and loading condition be transformed into data deliver to CPU through accurate calculate and the benchmark contrast after send instruction make actuator receive instruction after moment make a response, remove to control the very desirable high-quality electric current and voltage of output and satisfy power consumption equipment.
Program control has dual mode: 1 manually control, 2 controls automatically can be changed by the button on the man-computer interface.Requirement realizes all control on man-computer interface.Having the outage memory function, at first is bypass condition behind the outage incoming call, through just entering the preceding running status of outage behind the delay time of one section setting, needs input password confirming earlier before the control operation, and auto-idled under the manual mode is manually invalid under the automated manner.
Manually control: four driving switch are arranged on the man-computer interface: bypass, economize on electricity 1, economize on electricity 2, economize on electricity 3, directly by respective switch, switching signal of corresponding output is controlled terminal gear under manual mode.
Automatic control: according to the voltage range of each gear of setting, the detection of grid power consumption parameter is controlled the output of each gear automatically, and advances shelves at every turn and could move after shelves all will be delayed time by the regular hour with moving back, and this time can be set arbitrarily.
1 grade of return value: voltage is lower than this value and returns the bypass shelves
1 grade of operating value: voltage surpasses this value and enters 1 grade
2 grades of return values: voltage is lower than this value and returns 1 grade
2 grades of operating values: voltage surpasses this value and enters 2 grades
3 grades of return values: voltage is lower than this value and returns 2 grades
3 grades of operating values: voltage surpasses this value and enters 3 grades
It is primary line control that the sampling arithmetic element that Figure 4 shows that microprocessor is connected with the circuit of relevant elements, incoming power R, S, T process master switch QF enter La1, Lb1, the Lc1 inductance coil is held output toward U, V, W, when the electricity-saving appliance bypass, the Na3 of coil La2, Lb2, Lc2, Nb3, Nc3 end are connected (KM1 closure) respectively with power supply output U, V, W end, act on when electric current and can not produce the magnetic flux electromotive force during by iron core, can regard it as coil and be in open-circuit condition, so this moment, iron core can not worked.Because the internal resistance of coil La1, Lb1, Lc1 is very little, can regard bypass as, has guaranteed the continuity of output current again, end does not cut off the power supply when guaranteeing to change.Bypass contactor KM1 disconnects when electricity-saving appliance economizes on electricity, and gear contactor KM2, KM3, KM4 follow according to setting closed respectively, and three groups of coils form wye connection, forms a closed-loop path and makes iron core produce the magnetic flux output potential.KM2, KM3, KM4 are switching contactor, and by the Kirchhoff current law as can be known, electric current is much smaller than load current when KM2, KM3, KM4 switching.
It is secondary line control that the procedure control unit that Figure 5 shows that microprocessor is connected with the circuit of relevant elements: export one group of switching signal by procedure control unit and go to promote to carry out contactor, contactor KM1, KM2, KM3, KM4 are respectively: bypass, economize on electricity 1, economize on electricity 2, economize on electricity 3.KM5 is a capacitor switching contactor, and KA1, KA2, KA3, KA4 are the auxiliary relays of corresponding KM1, KM2, KM3, KM4.KM5 guarantees that electricity-saving appliance is in the bypass shape for protection output after the gear contactor breaks down disconnection.H1, H2, H3 are respectively: bypass indication, economize on electricity indication, faulty indication.
The protection part:
Fault auto by pass: under electricity-saving state, if the operation contactor breaks down when disconnecting the auto by pass after 3 seconds of delaying time; Over-current side path: auto by pass when electric current has reached set point; Cross thermal bypass: bypass when the movement temperature reaches the temperature of setting; Load surpasses bypass when specified.
Man-computer interface shows: 1) show running status, 2) three-phase phase voltage, 3) three-phase line voltage, 4) three-phase current, 5) zero-sequence current, 6) total active power, 7) total reactive power, 8) apparent power, 9) average power factor, 10) frequency, 11) 1-31 order harmonic components, 12) active energy, 13) reactive energy, 14) record 24 hours electric current and voltage, 15 failure monitorings.
Communications portion:
The communication interface of electricity-saving appliance is the RS-485 pattern, and communications protocol is adopted the MODBUS agreement of international standard, and Data Structures meets the universal standard.Communication speed has 300,1200,2400,4800,9600,19200bps, supports networking to connect, can be by the monitoring of wireless communication networks such as wired or GPRS, CDMA.
Claims (8)
1. closed loop system intelligence electricity-saving appliance comprises core section, filtering part, control section, protection part, communications portion, it is characterized in that:
The internal structure of core section is equivalent to, and one group of series reactor connects the non-phase control type electromagnetism of a pressure regulation throttling transformer, acts on the absorption compensation loop of subduing surge on the electrical network, high order harmonic component and the Z type winding of Voltage unbalance compensation with one group;
Filtering partly comprises can reduce electromagnetic interference that load the produces LC filter circuit to the power supply influence;
Control section comprises detecting unit, CPU, actuator, setting, display unit, monitoring unit; The output of detecting unit is connected with CPU, setting, display unit input respectively; The output of setting is connected with the input of CPU, display unit respectively; The output of CPU is connected with the input of actuator, display unit respectively; The output of actuator is connected with the input of display unit, monitoring unit respectively; The output of monitoring unit is connected with the input of CPU, display unit respectively;
Protection part comprises having the fault auto by pass, over-current side path, over-current side path, cross the setting that thermal bypass, load surpass bypass when specified;
Communications portion comprises having communication interface.
2. closed loop system intelligence electricity-saving appliance according to claim 1 is characterized in that: control section has manual control and controls two kinds of program controlled modes automatically, and described two kinds of program mode (PM)s can be changed by the button on the man-computer interface.
3. closed loop system intelligence electricity-saving appliance according to claim 2 is characterized in that:
Manually be controlled at the machine interface and be provided with bypass with outage memory function, economize on electricity 1, economize on electricity 2,3 four driving switch that economize on electricity are pressed respective switch, terminal driving switch signal of control of corresponding output;
Automatically control has the setting of 1 grade of return value, 1 grade of operating value, 2 grades of return values, 2 grades of operating values, 3 grades of return values, 3 grades of operating values, comes automatic detection of grid power consumption parameter to control the output of each gear according to the voltage range of described each gear of setting.
4. closed loop system intelligence electricity-saving appliance according to claim 3 is characterized in that:
1 grade of return value is that voltage is lower than this value and returns the bypass shelves;
1 grade of operating value is that voltage surpasses this value and enters 1 grade;
2 grades of return values are that voltage is lower than this value and returns 1 grade;
2 grades of operating values are that voltage surpasses this value and enters 2 grades;
3 grades of return values are that voltage is lower than this value and returns 2 grades;
3 grades of operating values are that voltage surpasses this value and enters 3 grades.
5. closed loop system intelligence electricity-saving appliance according to claim 1 is characterized in that: export the microprocessor that rational voltage magnitude is realized large power uninterrupted little current switching technology thereby CPU is the deviation of carrying out real-time dynamic precision detection, monitoring controlled volume and set-point with control.
6. closed loop system intelligence electricity-saving appliance according to claim 5 is characterized in that: microprocessor comprises sampling arithmetic element and procedure control unit.
7. closed loop system intelligence electricity-saving appliance according to claim 6 is characterized in that:
The input of described sampling arithmetic element is connected with incoming power R, S, T through master switch QF; Another road of incoming power R, S, T process master switch QF enters La1, Lb1, the Lc1 inductance coil is held output toward U, V, W, the Na3 of coil La2, Lb2, Lc2, Nb3, Nc3 end are connected respectively with power supply output U, V, W end by bypass contactor KM1, KM2, KM3, KM4 are the gear contactor, three groups of coils form wye connection, form an electromotive force closed-loop path that makes iron core produce magnetic flux output;
Described procedure control unit output switching signal is to promote to carry out bypass contactor KM1, economize on electricity 1 contactor KM2, economize on electricity 2 contactor KM3, economize on electricity 3 contactor KM4 respectively; KM5 guarantees the impregnable capacitor switching contactor of terminal electricity consumption for having protection output, and the one end connects ground wire, and the other end connects KA2, KA3, KA4; KA1, KA2, KA3, KA4 are the auxiliary relays of corresponding KM1, KM2, KM3, KM4.
8. closed loop system intelligence electricity-saving appliance according to claim 6 is characterized in that: described procedure control unit output switching signal is to promote to carry out bypass indication H1, economize on electricity indication H2, faulty indication H3 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201191340U CN201091054Y (en) | 2007-03-27 | 2007-03-27 | Closed loop type system intelligent electricity-saving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201191340U CN201091054Y (en) | 2007-03-27 | 2007-03-27 | Closed loop type system intelligent electricity-saving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201091054Y true CN201091054Y (en) | 2008-07-23 |
Family
ID=39862809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201191340U Expired - Fee Related CN201091054Y (en) | 2007-03-27 | 2007-03-27 | Closed loop type system intelligent electricity-saving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201091054Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841953A (en) * | 2009-03-18 | 2010-09-22 | 三垦电气株式会社 | Current balancing device, LED ligthing paraphernalia, LCD B/L module |
| CN101925231A (en) * | 2010-07-30 | 2010-12-22 | 李钢 | Intelligent device for tracking, controlling and managing energy efficiency of illumination |
| CN105429142A (en) * | 2015-12-25 | 2016-03-23 | 山西乐普节能技术有限公司 | High voltage power-saving system with seamless connection function |
-
2007
- 2007-03-27 CN CNU2007201191340U patent/CN201091054Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841953A (en) * | 2009-03-18 | 2010-09-22 | 三垦电气株式会社 | Current balancing device, LED ligthing paraphernalia, LCD B/L module |
| CN101925231A (en) * | 2010-07-30 | 2010-12-22 | 李钢 | Intelligent device for tracking, controlling and managing energy efficiency of illumination |
| CN105429142A (en) * | 2015-12-25 | 2016-03-23 | 山西乐普节能技术有限公司 | High voltage power-saving system with seamless connection function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103501058B (en) | Based on the energy efficiency management system of Intelligent platform zone | |
| CN103647458B (en) | Frequency conversion system and carry out the method and apparatus of precharge to the high voltage converter in it | |
| CN105242118A (en) | Inductance detection method for power factor correction PFC circuit and device | |
| CN201312283Y (en) | High-power intelligent electricity economizer start control device | |
| CN201091054Y (en) | Closed loop type system intelligent electricity-saving device | |
| CN111942206A (en) | Charging station electric power automation measurement and control energy-saving control system and method thereof | |
| CN104539197A (en) | Soft start and voltage reduction power saving comprehensive control device and method for asynchronous motor | |
| CN203278710U (en) | Novel magnetic control device of motor-type microcomputer | |
| CN103094845B (en) | Intelligent power-saving inlet wire main cabinet | |
| CN103532445B (en) | A kind of startup control device of heavy load start of motor and control method thereof | |
| CN103490484A (en) | Fuzzy controller for charger for electric vehicle | |
| CN207442725U (en) | A kind of drive electric appliance with adjusting zero point type isolating transformer | |
| CN201910624U (en) | Electrical energy optimizing device | |
| CN202797977U (en) | Power electronic system combining voltage support with fault current limiting | |
| CN202840292U (en) | Intelligent power saving incoming line main cabinet | |
| CN204205605U (en) | Intelligent low-pressure electricity-saving cabinet | |
| CN203243119U (en) | Combined intelligent amorphous-alloy transformer | |
| CN207994636U (en) | A kind of energy-saving inversion boosting complexes for solar power generation | |
| CN207053186U (en) | Power quality comprehensive treatment device | |
| CN2905297Y (en) | Automatic energy saver for arc welder | |
| CN201467040U (en) | Auto-coupling voltage-reduction starting control device | |
| CN201066828Y (en) | Electromotive intelligent power-saving starter | |
| CN207603237U (en) | A kind of charge protection device of DC charging unit | |
| CN201860114U (en) | Comprehensive automatic tracking energy-saving device | |
| CN204131130U (en) | A kind of battery saving arrangement based on intelligent AC electrical network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080723 |