CN103855710A - Two-bus bus-tie type harmonic wave protection method of office building power distribution cabinet system - Google Patents
Two-bus bus-tie type harmonic wave protection method of office building power distribution cabinet system Download PDFInfo
- Publication number
- CN103855710A CN103855710A CN201310710855.9A CN201310710855A CN103855710A CN 103855710 A CN103855710 A CN 103855710A CN 201310710855 A CN201310710855 A CN 201310710855A CN 103855710 A CN103855710 A CN 103855710A
- Authority
- CN
- China
- Prior art keywords
- bus
- waveform
- protector
- harmonic
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a two-bus bus-tie type harmonic wave protection method of an office building power distribution cabinet system. According to the two-bus bus-tie type harmonic wave protection method, two harmonic wave protection cabinets are used, and capacitance compensation cabinets and a power distribution cabinet are arranged between the harmonic wave protection cabinets. Each harmonic wave protection cabinet is provided with a main harmonic wave protector, an auxiliary harmonic wave protector and a coordinating module. Each harmonic wave protector is internally provided with a signal collecting circuit and an inverter circuit.
Description
Technical field
The present invention relates to distribution field, be specially a kind of harmonic protection method for two sections of bus mother formula office building power distribution cabinet systems.
Background technology
In the distribution system of electric power, because power distribution cabinet is for the impact of electrical network, produce harmonic current, therefore harmonic protection device often need to be set in distribution system.These protective devices can be modulated inhibition to the harmonic current producing in distribution system.But, about the layout of the distribution system in some specific fields, do not relate in the prior art.Because the controller switching equipment in specific field arranges that situation is changeable, and the configuration state of different equipment in system changes, and all will produce a very large impact the harmonic wave modulation case of whole distribution system.For example; the height difference that equipment requires for current waveform; the position of its access point difference to some extent, and itself and the correlation of harmonic protection device and the on-position of harmonic protection device itself all will exert an influence for the harmonic performance of equipment and system.
Meanwhile, because harmonic protection device often needs the abnormal operating states such as charging, maintenance in application, these states all will exert an influence for the harmonic wave modulation of whole distribution system.Do not solve pointedly for this particular problem in the prior art.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems, and it specifically proposes solution for the problems referred to above in office building distribution field.
The technical solution used in the present invention is:
A kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems, described power distribution cabinet system comprises bus, bus is divided into left section and right section, the middle mother line that passes through is connected with bus connection switch, left end in left section of bus is connected with the first transformer, right-hand member in right section of bus is connected with the second transformer, and described the first transformer and the second transformer provide electric power to bus, in left section of bus, bus is connected with the first left capacitor compensation cabinet and the second left capacitor compensation cabinet in turn on the right side of the first transformer, left harmonic protection cabinet is arranged on the leftmost side of described system, wherein, described left harmonic protection cabinet is connected with bus by left waveform detection circuit, described left waveform detection circuit is for obtaining the electric weight waveform of current bus, the tie point of described left waveform detection circuit and bus is positioned at the right side of described two left capacitor compensation cabinets and bus tie point, described left harmonic protection cabinet is also by left waveform modulated circuit and left outside portion connection, described left outside portion link tester is crossed air switch and is connected with bus, the tie point of left outside line and bus is positioned at the tie point left side of left waveform detection circuit and bus, and be positioned at described two left capacitor compensation cabinets and bus tie point right side, described left waveform modulated circuit is for exporting the modulation waveform for bus harmonic filtration, the right side of the tie point of left waveform detection circuit and bus is connected with convertible frequency air-conditioner power distribution cabinet, is connected with lift facility power distribution cabinet on described convertible frequency air-conditioner power distribution cabinet right side, in right section of bus, right side at described bus connection switch and bus tie point is connected with computer power distribution cabinet, be connected with fluorescent lamp electricity consumption power distribution cabinet on described computer power distribution cabinet right side, be connected with the first right capacitor compensation cabinet and the second right capacitor compensation cabinet in turn on fluorescent lamp electricity consumption power distribution cabinet right side, right harmonic protection cabinet is arranged on the rightmost side of described system, wherein, described right harmonic protection cabinet is connected with bus by right waveform detection circuit, described right waveform detection circuit is for obtaining the electric weight waveform of current bus, the tie point of described right waveform detection circuit and bus is positioned at the left side of described two right capacitor compensation cabinets and bus tie point, described right harmonic protection cabinet is also by right waveform modulated circuit and right outside portion connection, described right outside portion link tester is crossed air switch and is connected with bus, the tie point of right outside line and bus is positioned at the tie point right side of right waveform detection circuit and bus, and be positioned on the left of described two right capacitor compensation cabinets and bus tie point, described right waveform modulated circuit is for exporting the modulation waveform for bus harmonic filtration, described method comprises the steps:
1,, by waveform detection circuit Real-time Collection bus current data, analyze harmonic current;
2, produce anti-phase harmonic current by waveform modulated circuit, eliminate mains by harmonics.
Valuably, wherein, described harmonic protection cabinet is identical, includes modulation Coordination module, main harmonic protector and subharmonic protector, and wherein, main harmonic protector, for producing anti-phase harmonic current under normal conditions, is modulated bus waveform; Subharmonic protector, for produce anti-phase harmonic current in the time that main harmonic protector cannot normally be worked, is modulated bus waveform; Modulation Coordination module is used for the operating state of Real-Time Monitoring main harmonic protector and in the time that main harmonic protector cannot normally be worked, enables subharmonic protector; Wherein, in the time that modulation Coordination module detects main harmonic protector cisco unity malfunction, the waveform modulated being provided by main harmonic protector is provided modulation Coordination module gradually, and correspondingly increases gradually the waveform modulated being provided by subharmonic protector, thereby guarantees the steady of switching; In the time that main harmonic protector need to return to normal operating conditions, the waveform modulated being provided by subharmonic protector is provided modulation Coordination module gradually, and correspondingly increases gradually the waveform modulated being provided by main harmonic protector, thereby guarantees the steady of switching.
Valuably, wherein, described main harmonic protector and subharmonic protector include protector signals collecting circuit, Detecting Power Harmonics module, processing module, driver module, IGBT inverter circuit module, charging capacitor module, capacitor charging resistance, reactor and protector modulation circuit, wherein, Detecting Power Harmonics module is for by protector signals collecting circuit, modulation Coordination module given bus waveform being monitored, processor module for to Detecting Power Harmonics module monitors to signal carry out Treatment Analysis; Driver module is used for the control signal of receiving processor module and drives IGBT inverter circuit module, and IGBT inverter circuit module is for being used for the modulation waveform of bus by reactor and the output of protector modulation lines road direction modulation Coordination module; Described modulation Coordination module has the described waveform modulated circuit and the waveform detection circuit that are connected with bus; Described charging capacitor module is also the inner member power supply of harmonic protection device for stored electric energy, and capacitor charging resistance for avoiding described charging capacitor module impacted by super-high-current in the time that described charging capacitor module is charged.
It should be noted that not actual direction meaning of the term " left side " that adopts in the present invention, " right side ", it is only at the relative position relation of the various piece shown in indicator diagram.
Pass through such scheme, owing in distribution system, the power consumption equipments such as convertible frequency air-conditioner power distribution cabinet, lift facility power distribution cabinet, computer power distribution cabinet all having been carried out to reasonable setting, and harmonic protection device is connected into distribution system suitably, make each power consumption equipment in whole system all obtain good current waveform, avoided the potential safety hazard of the equipment such as elevator, computer; Use major-minor harmonic protection device simultaneously, made each harmonic protection cabinet there is double shield, for example charging, under the situation such as inefficacy, can guarantee inhibition and modulation to harmonic wave, improved stability and the reliability of system operation.
Accompanying drawing explanation
Fig. 1 is distribution system structural representation of the present invention;
Fig. 2 is the structural representation of harmonic protection of the present invention;
Fig. 3 is the structural representation of the harmonic protection circuit of the harmonic protection in Fig. 2 of the present invention.
Embodiment
With reference to Fig. 1-3, the present invention is described in detail.
A kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems, described power distribution cabinet system comprises bus 10, bus 10 is divided into left section and right section, the middle mother line 9 that passes through is connected with bus connection switch, left end in left section of bus is connected with the first transformer 1, right-hand member in right section of bus is connected with the second transformer 2, and described the first transformer 1 and the second transformer 2 provide electric power to bus 10, in left section of bus, bus is connected with the first left capacitor compensation cabinet 3 and the second left capacitor compensation cabinet 4 in turn on the right side of the first transformer 1, left harmonic protection cabinet 7 is arranged on the leftmost side of described system, wherein, described left harmonic protection cabinet 7 is connected with bus by left waveform detection circuit 72, described left waveform detection circuit 72 is for obtaining the electric weight waveform of current bus, described left waveform detection circuit 72 is positioned at described two left capacitor compensation cabinets 3 with the tie point of bus, 4 with the right side of bus tie point, described left harmonic protection cabinet 7 is also connected with left outside line 73 by left waveform modulated circuit 71, described left outside line 73 is connected with bus by air switch, left outside line 73 is positioned on the left of the tie point of left waveform detection circuit 72 and bus with the tie point of bus, and be positioned at described two left capacitor compensation cabinets 3, 4 with bus tie point right side, described left waveform modulated circuit 71 is for exporting the modulation waveform for bus harmonic filtration, left waveform detection circuit 72 is connected with convertible frequency air-conditioner power distribution cabinet with the right side of the tie point of bus, is connected with lift facility power distribution cabinet on described convertible frequency air-conditioner power distribution cabinet right side, in right section of bus, right side at described bus connection switch and bus tie point is connected with computer power distribution cabinet, be connected with fluorescent lamp electricity consumption power distribution cabinet on described computer power distribution cabinet right side, be connected with the first right capacitor compensation cabinet 5 and the second right capacitor compensation cabinet 6 in turn on fluorescent lamp electricity consumption power distribution cabinet right side, right harmonic protection cabinet 8 is arranged on the rightmost side of described system, , wherein, described right harmonic protection cabinet 8 is connected with bus by right waveform detection circuit 82, described right waveform detection circuit 82 is for obtaining the electric weight waveform of current bus, described right waveform detection circuit 82 is positioned at described two right capacitor compensation cabinets 3 with the tie point of bus, 4 with the left side of bus tie point, described right harmonic protection cabinet 8 is also connected with right outside line 83 by right waveform modulated circuit 81, described right outside line 83 is connected with bus by air switch, the tie point of right outside line 83 and bus is positioned at the tie point right side of right waveform detection circuit 82 and bus, and be positioned at described two right capacitor compensation cabinets 3, 4 with bus tie point left side, described right waveform modulated circuit 81 is for exporting the modulation waveform for bus harmonic filtration, described method comprises the steps:
1,, by waveform detection circuit 72,82 Real-time Collection bus current data, analyze harmonic current;
2, produce anti-phase harmonic current by waveform modulated circuit 71,81, eliminate mains by harmonics.
Valuably, wherein, described harmonic protection cabinet 7,8 structures are identical, include modulation Coordination module 73, main harmonic protector 74 and subharmonic protector 75, wherein, main harmonic protector 74, for producing under normal conditions anti-phase harmonic current, is modulated bus waveform; Subharmonic protector 75, for produce anti-phase harmonic current in the time that main harmonic protector 74 cannot normally be worked, is modulated bus waveform; Modulation Coordination module 73 is enabled subharmonic protector 75 for the operating state of Real-Time Monitoring main harmonic protector 74 and in the time that main harmonic protector 74 cannot normally be worked; Wherein, in the time that modulation Coordination module 73 detects main harmonic protector 74 cisco unity malfunction, the waveform modulated being provided by main harmonic protector 74 is provided modulation Coordination module 73 gradually, and correspondingly increases gradually the waveform modulated being provided by subharmonic protector 75, thereby guarantees the steady of switching; In the time that main harmonic protector 74 need to return to normal operating conditions, the waveform modulated being provided by subharmonic protector 75 is provided modulation Coordination module 73 gradually, and correspondingly increases gradually the waveform modulated being provided by main harmonic protector 74, thereby guarantees the steady of switching.
Valuably, wherein, described main harmonic protector 74 and subharmonic protector 75 include protector signals collecting circuit 741, Detecting Power Harmonics module 744, processing module 745, driver module 746, IGBT inverter circuit module 747, charging capacitor module 748, capacitor charging resistance 749, reactor 743 and protector modulation circuit 742, wherein, Detecting Power Harmonics module 744 is for monitoring the given bus waveform of modulation Coordination module 73 by protector signals collecting circuit 741, processor module 745 carries out Treatment Analysis for the signal that Detecting Power Harmonics module 744 is monitored, driver module 746 is for the control signal of receiving processor module 745 and drive IGBT inverter circuit module 747, IGBT inverter circuit module 747 for by reactor 743 and protector modulation circuit 742 to 73 outputs of modulation Coordination module the modulation waveform for bus, described modulation Coordination module 73 has the described waveform modulated circuit 71 and the waveform detection circuit 72 that are connected with bus, described charging capacitor module 748 is also the inner member power supply of harmonic protection device 74,75 for stored electric energy, and capacitor charging resistance 749 for avoiding described charging capacitor module 748 impacted by super-high-current in the time that described charging capacitor module 748 is charged.
Claims (3)
1. the harmonic protection method of one kind two sections bus mother formula office building power distribution cabinet systems, described power distribution cabinet system comprises bus (10), bus (10) is divided into left section and right section, the middle mother line (9) that passes through is connected with bus connection switch, left end in left section of bus is connected with the first transformer (1), right-hand member in right section of bus is connected with the second transformer (2), and described the first transformer (1) and the second transformer (2) provide electric power to bus (10), in left section of bus, bus is connected with the first left capacitor compensation cabinet (3) and the second left capacitor compensation cabinet (4) in turn on the right side of the first transformer (1), left harmonic protection cabinet (7) is arranged on the leftmost side of described system, wherein, described left harmonic protection cabinet (7) is connected with bus by left waveform detection circuit (72), described left waveform detection circuit (72) is for obtaining the electric weight waveform of current bus, described left waveform detection circuit (72) is positioned at described two left capacitor compensation cabinets (3 with the tie point of bus, 4) with the right side of bus tie point, described left harmonic protection cabinet (7) is also connected with left outside line (73) by left waveform modulated circuit (71), described left outside line (73) is connected with bus by air switch, left outside line (73) is positioned on the left of the tie point of left waveform detection circuit (72) and bus with the tie point of bus, and be positioned at described two left capacitor compensation cabinets (3, 4) with bus tie point right side, described left waveform modulated circuit (71) is for exporting the modulation waveform for bus harmonic filtration, left waveform detection circuit (72) is connected with convertible frequency air-conditioner power distribution cabinet with the right side of the tie point of bus, is connected with lift facility power distribution cabinet on described convertible frequency air-conditioner power distribution cabinet right side, in right section of bus, right side at described bus connection switch and bus tie point is connected with computer power distribution cabinet, be connected with fluorescent lamp electricity consumption power distribution cabinet on described computer power distribution cabinet right side, be connected with the first right capacitor compensation cabinet (5) and the second right capacitor compensation cabinet (6) in turn on fluorescent lamp electricity consumption power distribution cabinet right side, right harmonic protection cabinet (8) is arranged on the rightmost side of described system, wherein, described right harmonic protection cabinet (8) is connected with bus by right waveform detection circuit (82), described right waveform detection circuit (82) is for obtaining the electric weight waveform of current bus, described right waveform detection circuit (82) is positioned at described two right capacitor compensation cabinets (3 with the tie point of bus, 4) with the left side of bus tie point, described right harmonic protection cabinet (8) is also connected with right outside line (83) by right waveform modulated circuit (81), described right outside line (83) is connected with bus by air switch, the tie point of right outside line (83) and bus is positioned at the tie point right side of right waveform detection circuit (82) and bus, and be positioned at described two right capacitor compensation cabinets (3, 4) with bus tie point left side, described right waveform modulated circuit (81) is for exporting the modulation waveform for bus harmonic filtration, described method comprises the steps:
1), pass through waveform detection circuit (72,82) Real-time Collection bus current data, analysis harmonic current;
2), produce anti-phase harmonic current by waveform modulated circuit (71,81), elimination mains by harmonics.
2. the harmonic protection method of a kind of two sections of bus mother formula office building power distribution cabinet systems as claimed in claim 1, wherein, described harmonic protection cabinet (7,8) structure is identical, include modulation Coordination module (73), main harmonic protector (74) and subharmonic protector (75), wherein, main harmonic protector (74), for producing under normal conditions anti-phase harmonic current, is modulated bus waveform; Subharmonic protector (75), for produce anti-phase harmonic current in the time that main harmonic protector (74) cannot normally be worked, is modulated bus waveform; Modulation Coordination module (73) is enabled subharmonic protector (75) for the operating state of Real-Time Monitoring main harmonic protector (74) and in the time that main harmonic protector (74) cannot normally be worked; Wherein, in the time that modulation Coordination module (73) detects main harmonic protector (74) cisco unity malfunction, the waveform modulated being provided by main harmonic protector (74) is provided modulation Coordination module (73) gradually, and correspondingly increase gradually the waveform modulated being provided by subharmonic protector (75), thereby guarantee the steady of switching; In the time that main harmonic protector (74) need to return to normal operating conditions; the waveform modulated being provided by subharmonic protector (75) is provided modulation Coordination module (73) gradually; and correspondingly increase gradually the waveform modulated being provided by main harmonic protector (74), thereby guarantee the steady of switching.
3. the harmonic protection method of a kind of two sections of bus mother formula office building power distribution cabinet systems as claimed in claim 2, wherein, described main harmonic protector (74) and subharmonic protector (75) include protector signals collecting circuit (741), Detecting Power Harmonics module (744), processing module (745), driver module (746), IGBT inverter circuit module (747), charging capacitor module (748), capacitor charging resistance (749), reactor (743) and protector modulation circuit (742), wherein, Detecting Power Harmonics module (744) is for monitoring the given bus waveform of modulation Coordination module (73) by protector signals collecting circuit (741), processor module (745) carries out Treatment Analysis for the signal that Detecting Power Harmonics module (744) is monitored, driver module (746) is for the control signal of receiving processor module (745) and drive IGBT inverter circuit module (747), and IGBT inverter circuit module (747) is for being used for the modulation waveform of bus to modulation Coordination module (73) output by reactor (743) and protector modulation circuit (742), described modulation Coordination module (73) has the described waveform modulated circuit (71) and the waveform detection circuit (72) that are connected with bus, described charging capacitor module (748) is also the inner member power supply of harmonic protection device (74,75) for stored electric energy, and capacitor charging resistance (749) for avoiding described charging capacitor module (748) impacted by super-high-current in the time that described charging capacitor module (748) is charged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710855.9A CN103855710B (en) | 2013-12-16 | 2013-12-16 | A kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710855.9A CN103855710B (en) | 2013-12-16 | 2013-12-16 | A kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103855710A true CN103855710A (en) | 2014-06-11 |
| CN103855710B CN103855710B (en) | 2016-08-10 |
Family
ID=50863041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310710855.9A Active CN103855710B (en) | 2013-12-16 | 2013-12-16 | A kind of harmonic protection method of two sections of bus mother formula office building power distribution cabinet systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103855710B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040193329A1 (en) * | 1994-12-30 | 2004-09-30 | Ransom Douglas S. | System and method for securing energy management systems |
| CN1819400A (en) * | 2006-02-15 | 2006-08-16 | 贵阳铝镁设计研究院 | Continuous power supplier and power supply method with single-trunk segmental wiring |
| CN201498992U (en) * | 2009-09-28 | 2010-06-02 | 中国电力科学研究院 | Filter connection circuit for connecting buses |
| CN102004191A (en) * | 2010-09-29 | 2011-04-06 | 思源电气股份有限公司 | Method for calculating line capacitance in arc suppression coil parallel running system |
| CN202142859U (en) * | 2011-11-03 | 2012-02-08 | 刘明日 | Active filtering processing system with automatic voltage regulating function |
| CN202159977U (en) * | 2011-07-25 | 2012-03-07 | 山东蓝天电能科技有限公司 | Modularized active filtering device based on multi-DSP control |
-
2013
- 2013-12-16 CN CN201310710855.9A patent/CN103855710B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040193329A1 (en) * | 1994-12-30 | 2004-09-30 | Ransom Douglas S. | System and method for securing energy management systems |
| CN1819400A (en) * | 2006-02-15 | 2006-08-16 | 贵阳铝镁设计研究院 | Continuous power supplier and power supply method with single-trunk segmental wiring |
| CN201498992U (en) * | 2009-09-28 | 2010-06-02 | 中国电力科学研究院 | Filter connection circuit for connecting buses |
| CN102004191A (en) * | 2010-09-29 | 2011-04-06 | 思源电气股份有限公司 | Method for calculating line capacitance in arc suppression coil parallel running system |
| CN202159977U (en) * | 2011-07-25 | 2012-03-07 | 山东蓝天电能科技有限公司 | Modularized active filtering device based on multi-DSP control |
| CN202142859U (en) * | 2011-11-03 | 2012-02-08 | 刘明日 | Active filtering processing system with automatic voltage regulating function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103855710B (en) | 2016-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204882720U (en) | Intelligent computer direct current system monitoring facilities | |
| CN107479439B (en) | A kind of SVG control circuit based on motherboard structure | |
| CN205067643U (en) | Direct current system's of transformer substation distributed insulation monitoring and warning device | |
| EP2607912B1 (en) | Low-voltage testing device for high-voltage frequency converter of serial superposition voltage type | |
| CN204347118U (en) | Electrification in high voltage numerical monitor and blocking device | |
| CN103199530A (en) | Active power filter with method for processing harmonic waves in energy-saving and consumption-reducing mode | |
| CN102843060A (en) | Two-level two-direction current transformer and control method thereof | |
| CN103091524A (en) | Cable oscillatory wave partial discharge detection system shielding device | |
| CN203352454U (en) | Voltage-type high-frequency constant current source | |
| CN204068723U (en) | A kind of three-phase voltage sag generating means | |
| CN103580271A (en) | Modularized pluggable emergency power supply and working method thereof | |
| CN202856353U (en) | Software-embedded active filtering apparatus capable of rapidly responding | |
| CN104678756A (en) | Novel intelligent comprehensive power transformation and distribution monitoring system | |
| CN203773313U (en) | Door machine controller of metro shielding door | |
| CN103855710A (en) | Two-bus bus-tie type harmonic wave protection method of office building power distribution cabinet system | |
| CN103048502B (en) | Control protection system of valve steady-state operation test device of shutoff device | |
| CN103840463A (en) | Harmonic wave protection method of mine power distribution cabinet system | |
| CN205283408U (en) | Motor test electrical power generating system | |
| CN103840462A (en) | Harmonic protection method of garage power distribution system | |
| CN103840460A (en) | Harmonic wave protection method of two-stage bus type UPS machine room power distribution system | |
| CN103840459A (en) | Harmonic protection method for power distribution system of shopping mall | |
| CN103840461A (en) | Harmonic protection method of steel plant power distribution cabinet system with protection cabinets arranged at outer end | |
| CN103840458A (en) | Two-stage harmonic protection method for single-transformer power distribution system of hospital | |
| CN203911481U (en) | Building block heat overlap type active electric power filtering device | |
| CN203632247U (en) | Two-segment busbar coupling type harmonic protection system for power distribution of office building |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |