CN201733106U - Vacuum consumable electric arc furnace power compensation and harmonic suppression device - Google Patents
Vacuum consumable electric arc furnace power compensation and harmonic suppression device Download PDFInfo
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- CN201733106U CN201733106U CN2010202807686U CN201020280768U CN201733106U CN 201733106 U CN201733106 U CN 201733106U CN 2010202807686 U CN2010202807686 U CN 2010202807686U CN 201020280768 U CN201020280768 U CN 201020280768U CN 201733106 U CN201733106 U CN 201733106U
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- 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
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- 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
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Abstract
The utility model discloses a vacuum consumable electric arc furnace power compensation and harmonic suppression device, which comprises a transformer, a vacuum consumable electric arc furnace and a twelve-pulse rectification power device. The vacuum consumable electric arc furnace power compensation and harmonic suppression device is characterized by further including a control system, a changeover switch and a compensation suppression system. The control system is connected with a short web, the changeover switch is connected with the control system, and the compensation suppression system is respectively connected with the changeover switch and the short web. The control system includes a main controller circuit, a power circuit, a signal regulating circuit, a current transformer, a voltage transformer and a relay power amplifier input circuit. The compensation suppression system consists of a main compensation suppression cabinet and an auxiliary compensation suppression cabinet in parallel connection, the main compensation suppression cabinet and the auxiliary compensation suppression cabinet are connected with the short web respectively via a circuit breaker Q1 and a circuit breaker Q2, and two fifth harmonic filter sets, two seventh harmonic filter sets and four eleventh harmonic filter sets are connected in parallel into both the main compensation suppression cabinet and the auxiliary compensation suppression cabinet. The vacuum consumable electric arc furnace power compensation and suppression device has the advantages of simple structure, reasonable design, high intelligent level, energy source economization and convenient popularization and utilization.
Description
Technical field
The utility model belongs to power back-off and harmonic wave suppresses technical field, especially relates to a kind of vacuum consumable electrode arc furnace power back-off and harmonic suppression apparatus.
Background technology
Vacuum consumable electrode arc furnace is a kind of vacuum melting equipment of complexity, is mainly used in steel alloys such as high-melting-point active metals such as melting titanium, tungsten, molybdenum, tantalum, niobium and heat resisting steel, stainless steel.The supporting power-supply system of vacuum consumable electrode arc furnace is made up of rectifier transformer, interphase reactor, current limiting reactor etc., and nonlinear-load is big, electric current and voltage aberration rate height, and power factor is low; In addition, the smelting technology of vacuum consumable electrode arc furnace is different from the general industrial stove, and the arc short circuit phenomenon often takes place in whole fusion process, causes the short-circuit impact electric current, also can reduce power factor, and the harmonic distortion amount is strengthened.These reasons cause the electrical network energy loss, influence factory's benefit, and the serious harm power supply grid quality of power supply, and, if power factor does not reach the index of national regulation, often meeting with the fine of power supply department, power factor is low more, imposes a fine many more.Therefore vacuum consumable electrode arc furnace is carried out power back-off and harmonic wave suppresses to have crucial meaning.
In order to improve the power factor of vacuum consumable electrode arc furnace, suppress harmonic wave, voltage flicker, improve the effect and the fail safe of vacuum consumable electrode arc furnace, in the last few years, with German ALD company is that the arc furnace manufacturer of representative begins to adopt thyristor voltage regulation, the novel power supply system of two anti-star braid interphase reactor diode rectifications, whole power-supply system is formed 12 pulse wave circuit, its degree of regulation height by two cover rectifier power source parallel runnings, response speed is fast, current-sharing is effective, and stability is high, has improved power factor to a certain extent, grid supply quality and user's instructions for use have been satisfied, but, how on the basis of using this power supply, further improve power factor, suppress harmonic wave, be emphasis and the difficult point that the insider studies always.
Some power compensating devices are also arranged in the market, but the idle compensating control that most of power compensating device adopted all is a simple type, be that switching is carried out in simple computation power or measuring voltage and current waveform phase shift on the one hand, shortage is to the further investigation of network load character, particularly understand very few to the harmonic wave enlarge-effect to electrical network high order harmonic component and electric capacity, be simple on the other hand with the basis for estimation of power factor as switched capacitor, can not satisfy the actual motion needs, often there is throw in-of oscillation to take place, have a strong impact on the safe operating life of equipment, and do not consider the enlarge-effect of capacitor to harmonic wave yet, itself does not also prevent the ability of harmonious anti-Harmonic Interference, cause the user that the imaginary power automatic compensation controller is installed can not normally carry out capacitor switching, sort controller can not satisfy the needs of vacuum consumable electrode arc furnace reactive power compensation and harmonic wave inhibition.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of vacuum consumable electrode arc furnace power back-off and harmonic suppression apparatus at above-mentioned deficiency of the prior art, and it is simple in structure, reasonable in design, intelligent degree height, cost is low, and energy savings is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of vacuum consumable electrode arc furnace power back-off and harmonic suppression apparatus, the vacuum consumable electrode arc furnace that comprises transformer, joins by short net and transformer and be connected on the rectifier power source equipment of powering to vacuum consumable electrode arc furnace between short net and the vacuum consumable electrode arc furnace, described rectifier power source equipment is the equivalent 12 pulsating wave rectification circuit of being made up of two rectifier cabinet parallel runnings; It is characterized in that: also comprise reversing switch that the control system of joining with short net and control system are joined and the compensation inhibition system of joining respectively with reversing switch and short net; Described control system comprises main controller circuit and the power circuit of powering to control system, the input termination signal conditioning circuit of main controller circuit, the secondary side of the input termination current transformer of signal conditioning circuit and the secondary side of voltage transformer, the short net of a side joint of current transformer is also gathered short online electric current, the short net of a side joint of voltage transformer is also gathered short online voltage, export to after the voltage signal that current signal that signal conditioning circuit is gathered current transformer and voltage transformer are gathered is nursed one's health signal is compared, the main controller circuit of analyzing and calculating, the output contact of main controller circuit is sent out the switching group and the relay power amplifier input circuit that feeds back to main controller circuit is exported in the contact, and the output of described relay power amplifier input circuit taps into capable manual switching, stop the reversing switch that switching and automatic switching are selected; Described compensation suppresses system and suppresses cabinet and auxilliary compensation by the main compensation that is connected in parallel and suppress cabinet and constitute, and described main compensation suppresses cabinet and joins by circuit breaker Q 1 and short net, and described auxilliary compensation suppresses cabinet and joins by circuit breaker Q 2 and short net; Described main compensation suppresses cabinet and auxilliary compensation suppresses all to be connected in parallel to four groups of passive filters in the cabinet, and described four groups of passive filters are made of two groups of quintuple harmonics filters, one group of the seventh harmonic filter and one group of ten first harmonic filter.
Described quintuple harmonics filter is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L5 and capacitor C5.
Described the seventh harmonic filter is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L7 and capacitor C7.
Described ten first harmonic filters are made of the circuit breaker Q that is connected in series successively, contactor K, reactor L11 and capacitor C11.
Described control system also comprises key circuit that is connected on the main controller circuit input and the reference power factor is provided with and the display circuit that is connected on the main controller circuit output and voltage, electric current, active power and reactive power parameter are shown.
Described main controller circuit is the controller circuitry that is integrated with the RS-232 telecommunication circuit.
The controller circuitry of described main controller circuit for constituting by single-chip microcomputer.
Described single-chip microcomputer is chip 80C196.
The utility model compared with prior art has the following advantages:
1, adopts two groups of compensation of major-minor to suppress cabinet and realized the switching that becomes more meticulous.The utility model is primarily aimed at vacuum consumable electrode arc furnace power supply characteristics and smelting technology design, main compensation inhibition cabinet that employing is connected in parallel and auxilliary compensation suppress cabinet formation compensation inhibition system, each compensation suppresses all to be connected in parallel to 4 groups of passive filters in the cabinet, totally 8 groups of passive filters, when concrete switching, can opening the arc phase according to fusion process, the smelting technology of normal smelting phase and feeding phase is set passive filter switching group number for the 4-8 group to the different requirements of electric current, realization becomes more meticulous the switching compensation to reach best compensation effect, also can avoid the throw in-of oscillation that is produced because of quick switching simultaneously.In addition, because five times, the seventh harmonic content are little in vacuum consumable electrode arc furnace 12 pulsating wave rectifier power source, ten first harmonic content are higher relatively, but the capacitor in the compensation inhibition system all has amplification to harmonic wave, therefore five times all are necessary to suppress with the seventh harmonic, also will suppress ten higher first harmonics of content in addition.So quintuple harmonics and the seventh harmonic are respectively designed two groups of filtering systems, suppress five times and the seventh harmonic, capacity is fit to; Than ten higher first harmonics, design four groups of filtering systems for content, can effectively eliminate ten first harmonics.
2, adopt the passive filtering method, administered the high-load harmonic wave specific time.The utility model adopts the passive filter of circuit breaker, contactor, reactor and capacitor composition as filtering system.Cardinal principle is to utilize the impedance characteristic relevant with frequency of reactor and capacitor, the topological form of suitable selective filter and reactor, capacitor parameters, make filter be Low ESR for the harmonic current of some characteristic frequency, the harmonic current of this characteristic frequency is with a large amount of inflow filters, thereby reduce to flow into the harmonic current of this characteristic frequency of public network electrical network, played the effect of filtering.In addition, the passive filtering system cost is lower, and is economical and practical applicable in the hicap.
3, adopt high-performance computer technical intelligence control system to realize the control that intelligent degree is high.The intelligent controller that the utility model adopted is to develop according to arc furnace power-supply system and smelting technology process and the pluses and minuses of summing up traditional controller.Intelligent controller adopts power factor to set and actual reactive requirement combines as the basis for estimation of capacitor switching; fundamentally avoided the generation of throw in-of oscillation and sent idle to electrical network; and have overvoltage and low-voltage limit value set-up function; help the adjustment of line voltage; also have fundamental voltage and electric current and harmonic voltage and electric current implementation effective monitoring and out-of-limit defencive function to electrical network and capacitor; can write down the capacitor switching number of times in addition; failure logging and blocking function are for guaranteeing equipment safety operation and preventing that the harmonic wave amplification from providing effective means.
In sum, the utility model degree height reasonable in design, intelligent, result of use is good, realized that not only the switching that becomes more meticulous compensates, reached best compensation effect, also avoided the throw in-of oscillation that is produced because of quick switching simultaneously, administered the high-load harmonic wave specific time, cost is low, and energy savings is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural representation that the utility model master (assisting) compensation suppresses cabinet.
Description of reference numerals:
The 1-transformer; The 2-vacuum consumable electrode arc furnace; 3-rectifier power source equipment;
The 4-control system; The 4-1-main controller circuit; The 4-2-power circuit;
The 4-3-signal conditioning circuit; The 4-4-current transformer; The 4-5-voltage transformer;
4-6-relay power amplifier input 4-7-key circuit; The 4-8-display circuit;
Circuit;
The 5-reversing switch; 6-compensation inhibition system; 6-1-master compensates the inhibition cabinet;
The auxilliary compensation of 6-2-suppresses cabinet; The filtering of 6-11-quintuple harmonics filtering 6-12-the seventh harmonic
Device; Device;
6-13-ten first harmonic filtering
Device.
Embodiment
As depicted in figs. 1 and 2, the vacuum consumable electrode arc furnace 2 that the utility model comprises transformer 1, join by short net and transformer 1 and be connected on short net with vacuum consumable electrode arc furnace 2 between the rectifier power source equipment 3 of powering to vacuum consumable electrode arc furnace 2, described rectifier power source equipment 3 is the equivalent 12 pulsating wave rectification circuit of being made up of two rectifier cabinet parallel runnings; It is characterized in that: the reversing switch 5 that also comprise the control system 4 of joining, joins with control system and suppress system 6 with compensation that reversing switch 5 and short net join respectively with short net; Described control system 4 comprises main controller circuit 4-1 and gives the power circuit 4-2 of control system 4 power supplies, the input termination signal conditioning circuit 4-3 of main controller circuit 4-1, the secondary side of the input termination current transformer 4-4 of signal conditioning circuit 4-3 and the secondary side of voltage transformer 4-5, the short net of the side joint of current transformer 4-4 is also gathered short online electric current, the short net of the side joint of voltage transformer 4-5 is also gathered short online voltage, export to after the voltage signal that current signal that signal conditioning circuit 4-3 is gathered current transformer 4-4 and voltage transformer 4-5 are gathered is nursed one's health signal is compared, the main controller circuit 4-1 that analyzes and calculate, the output contact of main controller circuit 4-1 is sent out the switching group and the relay power amplifier input circuit 4-6 that feeds back to main controller circuit 4-1 is exported in the contact, and the output of described relay power amplifier input circuit 4-6 taps into capable manual switching, stop the reversing switch 5 that switching and automatic switching are selected; Described compensation suppresses system 6 and suppresses cabinet 6-1 and auxilliary compensation by the main compensation that is connected in parallel and suppress cabinet 6-2 and constitute, and described main compensation suppresses cabinet 6-1 and joins by circuit breaker Q 1 and short net, and described auxilliary compensation suppresses cabinet 6-2 and joins by circuit breaker Q 2 and short net; Described main compensation suppresses cabinet 6-1 and auxilliary compensation suppresses all to be connected in parallel to four groups of passive filters in the cabinet 6-2, and described four groups of passive filters are made of one group of quintuple harmonics filter 6-11, one group of the seventh harmonic filter 6-12 and two group of ten first harmonic filter 6-13.
In the present embodiment, described quintuple harmonics filter 6-11 is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L5 and capacitor C5.Described the seventh harmonic filter 6-12 is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L7 and capacitor C7.Described ten first harmonic filter 6-13 are made of the circuit breaker Q that is connected in series successively, contactor K, reactor L11 and capacitor C11.Described control system 4 also comprises key circuit 4-7 that is connected on main controller circuit 4-1 input and the reference power factor is provided with and the display circuit 4-8 that is connected on main controller circuit 4-1 output and voltage, electric current, active power and reactive power parameter are shown.Described main controller circuit 4-1 is the controller circuitry that is integrated with the RS-232 telecommunication circuit.The controller circuitry of described main controller circuit 4-1 for constituting by single-chip microcomputer.Described single-chip microcomputer is chip 80C196.
The course of work of the present utility model is: when reversing switch 5 is selected the mode of automatic switching, after system starts working, by key circuit 4-7 the reference power factor is set, the current signal of current transformer 4-4 acquisition system, the voltage signal of voltage transformer 4-5 acquisition system, after signal conditioning circuit 4-3 conditioning, be sent to main controller circuit 4-1, main controller circuit 4-1 is with electric current, voltage signal compares, calculate active power, the reactive power parameter, and result of calculation analyzed, the power demand that calculates and the reference power factor of setting are compared, the output corresponding control signal is given relay power amplifier input circuit 4-6, relay power amplifier input circuit 4-6 triggers main compensation inhibition cabinet 6-1 and auxilliary compensation suppresses quintuple harmonics filter 6-11 among the cabinet 6-2, the switching group number of the seventh harmonic filter 6-12 and ten first harmonic filter 6-13, make load or burden without work remain on floor level, and effectively prevent throw in-of oscillation, avoid sending reactive energy and the harmonic wave that system produces being amplified to system, simultaneously, relay power amplifier input circuit 4-6 feeds back to main controller circuit 4-1 with contact output, form close loop control circuit, realize intelligent control, main controller circuit 4-1 output display control signal is given display circuit 4-8, display circuit 4-8 is to voltage, electric current, active power and reactive power parameter show in real time, integrated RS-232 telecommunication circuit among the main controller circuit 4-1, can realize the system remote communication, the utility model links to each other with the equipment with telecommunications functions, can carry out remote parameter setting and remote monitoring.
In addition, according to the difference of load, the difference of power factor change when the utility model is used for power factor and relatively changes less load, also can select to receive the manual switching modes by reversing switch 5; Reversing switch 5 can also select to stop the mode of switching, by manual switching, stop the selection of switching and three kinds of modes of automatic switching, can suppress harmonic wave to greatest extent.
After tested, test used vacuum consumable electrode arc furnace, before using the utility model, the power factor of electrical network is between 0.3-0.6, and harmonic distortion is serious, and wherein 11 subharmonic content surpass 10% of first-harmonic, after using the utility model, its power factor of time in the whole fusion process more than 80% surpasses 0.98, and has the part-time power factor to reach 1, the real purpose that realizes full compensation.The harmonic wave part is also effectively suppressed, and the harmonic distortion amount is administered 2.3%, and wherein the 11 subharmonic content that content is the highest also have only 1.8% of first-harmonic.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection range of technical solutions of the utility model according to the utility model technical spirit.
Claims (8)
1. vacuum consumable electrode arc furnace power back-off and harmonic suppression apparatus, the vacuum consumable electrode arc furnace (2) that comprises transformer (1), joins by short net and transformer (1) and be connected on short net and vacuum consumable electrode arc furnace (2) between the rectifier power source equipment (3) of powering to vacuum consumable electrode arc furnace (2), described rectifier power source equipment (3) is the equivalent 12 pulsating wave rectification circuit of being made up of two rectifier cabinet parallel runnings; It is characterized in that: also comprise the control system (4) of joining, the reversing switch (5) that joins with control system and the compensation inhibition system (6) of joining respectively with reversing switch (5) and short net with short net; Described control system (4) comprises main controller circuit (4-1) and gives the power circuit (4-2) of control system (4) power supply, the input termination signal conditioning circuit (4-3) of main controller circuit (4-1), the secondary side of the input termination current transformer (4-4) of signal conditioning circuit (4-3) and the secondary side of voltage transformer (4-5), the short net of a side joint of current transformer (4-4) is also gathered short online electric current, the short net of a side joint of voltage transformer (4-5) is also gathered short online voltage, export to after the voltage signal that current signal that signal conditioning circuit (4-3) is gathered current transformer (4-4) and voltage transformer (4-5) are gathered is nursed one's health signal is compared, the main controller circuit (4-1) of analyzing and calculating, the output contact of main controller circuit (4-1) is sent out the switching group and the relay power amplifier input circuit (4-6) that feeds back to main controller circuit (4-1) is exported in the contact, and the output of described relay power amplifier input circuit (4-6) taps into capable manual switching, stop the reversing switch (5) that switching and automatic switching are selected; Described compensation suppresses system (6) and is suppressed cabinet (6-1) and assist compensation inhibition cabinet (6-2) to constitute by the master's compensation that is connected in parallel, described main compensation suppresses cabinet (6-1) and joins by circuit breaker Q 1 and short net, and described auxilliary compensation suppresses cabinet (6-2) and joins by circuit breaker Q 2 and short net; Described main compensation suppresses cabinet (6-1) and auxilliary compensation suppresses all to be connected in parallel to four groups of passive filters in the cabinet (6-2), and described four groups of passive filters are made of one group of quintuple harmonics filter (6-11), one group of the seventh harmonic filter (6-12) and two group of ten first harmonic filter (6-13).
2. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: described quintuple harmonics filter (6-11) is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L5 and capacitor C5.
3. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: described the seventh harmonic filter (6-12) is made of the circuit breaker Q that is connected in series successively, contactor K, reactor L7 and capacitor C7.
4. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: described ten first harmonic filters (6-13) are made of the circuit breaker Q that is connected in series successively, contactor K, reactor L11 and capacitor C11.
5. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: the display circuit (4-8) that described control system (4) also comprises the key circuit (4-7) that is connected on main controller circuit (4-1) input and the reference power factor is provided with and is connected on main controller circuit (4-1) output and voltage, electric current, active power and reactive power parameter are shown.
6. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: described main controller circuit (4-1) is for being integrated with the controller circuitry of RS-232 telecommunication circuit.
7. according to described vacuum consumable electrode arc furnace power back-off of claim 1 and harmonic suppression apparatus, it is characterized in that: the controller circuitry of described main controller circuit (4-1) for constituting by single-chip microcomputer.
8. according to described vacuum consumable electrode arc furnace power back-off of claim 7 and harmonic suppression apparatus, it is characterized in that: described single-chip microcomputer is chip 80C196.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202807686U CN201733106U (en) | 2010-08-02 | 2010-08-02 | Vacuum consumable electric arc furnace power compensation and harmonic suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202807686U CN201733106U (en) | 2010-08-02 | 2010-08-02 | Vacuum consumable electric arc furnace power compensation and harmonic suppression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201733106U true CN201733106U (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202807686U Expired - Fee Related CN201733106U (en) | 2010-08-02 | 2010-08-02 | Vacuum consumable electric arc furnace power compensation and harmonic suppression device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201733106U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326557A (en) * | 2013-06-29 | 2013-09-25 | 孙崇山 | Capacitance compensation energy saving system on valve side of rectifier unit |
| CN105515015A (en) * | 2016-01-27 | 2016-04-20 | 蚌埠市徽泰电气自动化有限公司 | Low-voltage circuit dynamic reactive power compensation device and low-voltage circuit reactive power compensation method |
| CN109286193A (en) * | 2018-11-01 | 2019-01-29 | 乌海市创新技术应用研究所 | A kind of electric arc furnace low-pressure reactive compensation and filter and its voltage control method |
-
2010
- 2010-08-02 CN CN2010202807686U patent/CN201733106U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326557A (en) * | 2013-06-29 | 2013-09-25 | 孙崇山 | Capacitance compensation energy saving system on valve side of rectifier unit |
| CN105515015A (en) * | 2016-01-27 | 2016-04-20 | 蚌埠市徽泰电气自动化有限公司 | Low-voltage circuit dynamic reactive power compensation device and low-voltage circuit reactive power compensation method |
| CN109286193A (en) * | 2018-11-01 | 2019-01-29 | 乌海市创新技术应用研究所 | A kind of electric arc furnace low-pressure reactive compensation and filter and its voltage control method |
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| 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: 20110202 Termination date: 20130802 |