CN209472398U - A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC - Google Patents
A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC Download PDFInfo
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- CN209472398U CN209472398U CN201920286868.0U CN201920286868U CN209472398U CN 209472398 U CN209472398 U CN 209472398U CN 201920286868 U CN201920286868 U CN 201920286868U CN 209472398 U CN209472398 U CN 209472398U
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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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Abstract
The utility model discloses the devices that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC a kind of, including power supply unit and the display unit connected with device internal calculation unit, input unit, control output unit；The power supply unit to the present apparatus to be powered；The display unit data derive from device internal calculation unit；The input unit will input or the data of acquisition are transferred to the device internal calculation unit；The device internal calculation unit combines the data of acquisition input, calculates the reactive compensation Qc that should be put into after AC/AC (alternating current) variable-frequency rolling line SVC damage；The model that the device internal calculation unit exports is reached external device controller by the control output unit.The characteristics of compared with prior art with no investment, Rolling production recovery is fast, does not influence the power system reactive power factor and quality of voltage.
Description
Technical field
The utility model relates to power supply and distribution field, especially a kind of AC/AC (alternating current) variable-frequency rolling line jettisoning static reactive power compensator
The device quickly to resume production.
Background technique
Equipment of Hot Strip Mill AC-AC frequency conversion system power factor is low, and voltage drop is big, spread of voltage, needs mating static benefit
It repays device SVC and carries out voltage compensation, power factor compensation, so that system voltage when steel rolling be kept to stablize.Due to existing SVC device
Control system is complicated, and power electronic devices and live hardware are easily damaged, and since cost is high, general hot rolling mill will not be to SVC
The important control device and current-limiting reactor of system carry out spare part preparation, lead to hot rolling mill after above controller part and hardware damage
It stops production for a long time.General current-limiting reactor damage, can stop production more than ten days in the case where no spare part, brought economic loss
Number is huge.
Static reactive power compensator (SVC) is the electric system for maintaining network voltage to ensure production, as shown in Figure 1, SVC connects
Enter in rolling line network system, filter group (FC) provides fixed capacitive reactive power (QC), SVC control system acquire rolling line electric current and
The electric current for flowing through compensation reactor after voltage by thyristor triggering device control, provides inductive reactive power Q for systemTCR.Work as QN=
QV-QC+QTCR=constant is (in formula: QNFor System Reactive Power, QVFor reactive load), power factor of electric network=constant, network voltage is several
It does not fluctuate.Once any damage occur in SVC control system and series compensation reactor, and production scene is without the deposit part
Replacement, inductive reactive power QTCR=0, System Reactive Power Q when steel rollingN=QV-QC, i.e., in the capacitive reactive power Qc whole of filter group (FC)
Net, network system voltage significantly increase, and seriously jeopardize the electrical equipments such as transformer, AC-AC frequency converter.
There is no guarantor's shipping unit of jettisoning static reactive power compensator in current above-mentioned rolling line electric system, when SVC accident, because
No expensive SVC controller and reactor spare part will lead to stop production for a long time；And by searching for historical data and after theoretical calculation, then
The system main transformer gear and filter group are manually adjusted, because national equipment of Hot Strip Mill proficiency is different, calculates and tests repeatedly
Demonstrate,prove that difficulty is big, risk is high, AC/AC (alternating current) variable-frequency milling train time of temporarily resuming production is longer, or even the damage other user power utilization demands of power grid
It contributes with electric network active is reduced.
Utility model content
The technical assignment of the utility model is to provide a kind of AC/AC (alternating current) variable-frequency rolling line jettisoning for the above the deficiencies in the prior art
The device that quickly resumes production of SVC, control system of the AC/AC (alternating current) variable-frequency rolling line in the high static reactive power compensator of cost (SVC)
Or after series compensation reactor (one group in general 6 groups) damage, transported by a kind of guarantor of jettisoning static reactive power compensator (SVC)
Device ensures that equipment of Hot Strip Mill production restores in time in time, and does not influence the normal electricity consumption of the other electricity consumption departments of the bus-bar system,
Network Voltage Stability is kept simultaneously.
The technical scheme in the invention for solving the technical problem is: a kind of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC's is quick extensive
Multiple process units, it is characterised in that: including power supply unit and the display unit connected with device internal calculation unit, input list
Member, control output unit；The power supply unit to the present apparatus to be powered；The display unit data are from dress
Set internal calculation unit；The input unit will input or the data of acquisition are transferred to the device internal calculation list
Member；The device internal calculation unit combines the data of acquisition input, should put into after calculating AC/AC (alternating current) variable-frequency rolling line SVC damage
Reactive compensation Qc；The model that the device internal calculation unit exports is reached external equipment control by the control output unit
Device processed.
Above-mentioned display unit and input unit is liquid crystal control panels.
The signal that device internal calculation unit exports is reached external device controller by above-mentioned control output unit, packet
It includes and each filter is put into/exited control signal exports to the control device of each group filter, and export the system main transformer
Gear control signal is to control device for transformer.
It further include manual correction unit in prioritization scheme, for the setting modification of device intrinsic parameter.
Above-mentioned manual correction unit can be directly connected to the device internal calculation unit and carry out parameter modification.
Above-mentioned manual correction unit also can connect the input unit and then realize to device internal calculation unit
Parameter modification.
Compared with prior art, the utility model have it is following prominent the utility model has the advantages that
1, in the AC/AC (alternating current) variable-frequency band steel rolled-wire electric system with static reactive power compensator (SVC), newly-increased one kind can
Guarantor's shipping unit of jettisoning SVC, the device can acquire or input in advance the acquisition of SVC during normal production active/idle/highest and
The parameters such as minimum voltage can automatically control filter FC group number after accident as needed and adjust fixed capacitive reactive power Qc, automatic to control
Make the system transformer gear；
2, the utility model does not damage the other power consumer power demands of the power grid and reduces electric network active power output, protects simultaneously
Hold Network Voltage Stability；Without investment, Rolling production restores fast, does not influence the power system reactive power factor and quality of voltage；
3, the utility model has small investment, and Rolling production restores fast, before damage spare part arrival restores completely, the power grid without
Function power factor and quality of voltage influence small feature；
4, the steel rolling alternating-current-alternating-current frequency conversion system of the current several hundred sets of national equipment of Hot Strip Mill and outfit static reactive power compensator
It can quickly be resumed production with utility model device, not the millions of control device of stand-by storage and reactor spare part, the whole nation
Metallurgical system promotion potential is huge, can create huge economic benefit to enterprise.
Detailed description of the invention
Fig. 1 is prior art SVC system composition schematic diagram.
Fig. 2 is the system connection schematic diagram of the utility model.
Fig. 3 is the functional relationship block diagram of the utility model.
Fig. 4 is the functional relationship block diagram of the utility model embodiment 2.
Fig. 5 is transformer nameplate parameter reference picture in the utility model embodiment.
Fig. 6 is the utility model rolling line power supply system schematic diagram.
Fig. 7 is the flow chart of the utility model embodiment 2.
Specific embodiment
The present invention will be further described with specific embodiment with reference to the accompanying drawings of the specification.The utility model is one
The device that quickly resumes production of kind AC/AC (alternating current) variable-frequency rolling line jettisoning SVC, is described below in detail the embodiments of the present invention, the reality
The example for applying example is intended for explaining the utility model, and should not be understood as limiting the present invention.It is not infused in embodiment
Bright particular technique or condition person, according to the literature in the art described technology or conditions or according to product description into
Row.Production firm person is not specified in instrument, and being can be with conventional products that are commercially available, and application method and inherence are former
Reason is not stated again tired.
Utility model device control function is shown according to rolling line minimax load and grid power parameter, is calculated
The existing transformer gear and filter FC group number that SVC failure should be put into after stopping transport, can either manually or automatically control transformation
Device gear and filter FC group number.
The utility model quickly resumes production, and device is mountable on filter FC high-voltage switch cabinet door panel, and outside connects
Relationship is connect as shown in Fig. 2, acquiring grid line voltage and phase voltage from main transformer T low-pressure side 35kV PT cabinet；From main transformer T low-pressure side
35kV outlet switch cabinet current transformer acquires electric current.Each filter (FC), which is exported, by control output unit puts into/exit control
Signal processed to each group filter control device, and export the system main transformer gear control signal to transformer control fill
It sets.When the TCR device failure such as SVC control system or bidirectional thyristor, it can in emergency circumstances pass through this device manual confirmation
Or automatic calculating, complete the output action of filter FC group number and transformer gear selection investment.
Utility model device composition: including power supply unit and the display unit connected with device internal calculation unit,
Input unit, control output unit.
The power supply unit, its object is to which 220V alternating current is converted into low pressure 24 or 12V power supply, to this dress
It sets and is powered, specific element can be transformer.Because the specific implementation of this Elementary Function is numerous, this field
Technical staff can be according to its function unrestricted choice to be achieved corresponding hardware in the prior art, therefore hardware components do not do and have
Body description and restriction, each functional unit narrating mode is similar below.
The display unit can show the numerical value such as input, the numerical value of output or parameter by display unit, display
Data source is in device internal calculation unit.Liquid crystal control panels can be used, it can be using conventional display board card module, wiring
Terminal etc., hardware components are not specifically described and are limited.
The input unit: its object is to be required by the requirement of system voltage stability bandwidth, reactive factor and now
The requirement of alternating-current-alternating-current frequency conversion system to voltage, in advance input or automatic collection during normal production SVC acquisition it is active/idle/
The real time datas such as highest and lowest voltage, and the data of input or acquisition are transferred to the device internal calculation unit.
Can be using conventional input analog input card module, connecting terminal etc., hardware components are not specifically described and are limited.Prioritization scheme
In, the display unit and input unit are using the liquid crystal control panels for showing that input function is integrated.
The device internal calculation unit: by the example, in hardware including CPU element, in conjunction with the input unit
The parameters such as rolling line main transformer and the network transformer route of input are acquired, should be put into after calculating AC/AC (alternating current) variable-frequency rolling line SVC damage
Reactive compensation Qc.Input data and calculation method include: main transformer high pressure in the case of two kinds of the highest and lowest load of rolling line
Side voltage drop；According to main transformer high side voltage when minimum load and the requirement of rolling line ceiling voltage, transformer voltage ratio is calculated；According to most
Main transformer high side voltage and the requirement of rolling line minimum voltage, are calculated the filter Qc that should be put into when big load；Choose close Qc
Filter after verify, and according to the fine-tuning transformer voltage ratio such as voltage ripple of power network.The device internal calculation unit
In calculate the method being related in detail, process is seen below, but this method and process are only a kind of way of realization, and others may be implemented
The method for the reactive compensation Qc function that this unit acquisition parameter, calculating should be put into can be used.Can use can be realized
Chip modules, the hardware components such as the conventional single-chip microcontroller of function are stated not specifically describe and limit.
The control output unit: the signal that the device internal calculation unit exports is reached into peripheral equipment control
Device exports to the control device of each group filter including putting into/exiting control signal for each filter (FC), and exports this and be
Main transformer gear control signal unite to control device for transformer.To realize adjustment main shift and filter group number (scene
Main shift 0,1-17 grades, tetra- groups of filter group number H3/H5/H7/H11).It can be using conventional output module, connecting terminal
Deng hardware components are not specifically described and limited.
It can also include manual correction unit in prioritization scheme, function is modified in the setting of realization device intrinsic parameter, such as can
It is manually entered active/idle/highest and lowest voltage of SVC acquisition during normal production, power network equipment electricity can be manually entered
Force parameter.It can be after voltage ripple of power network situation when actually looking at Rolling production and power factor change situation according to practical feelings
Condition is to main transformer gear and can correct manually in device panel.Specific data connection relationship, can be as shown in figure 3, for hand
Dynamic amending unit is directly connected to the device internal calculation unit and carries out parameter modification, can also be as shown in figure 4, manual correction
The parameter modification of the unit connection input unit and then realization to device internal calculation unit.
When the power electronic control system of hot rolling mill SVC system and series compensation reactor failure, TCR and reactor stop
Fortune, rolling line milling train are forced tripping grinder, produce new equipment using the guarantor in the application at this time, automatically control filter FC group number tune
Capacitive reactive power Qc is determined in solidating, and automatically controlling the system transformer gear, (when non-on-load regulator transformer, need to show should adjust shelves
Position).After electric system matches again, AC/AC (alternating current) variable-frequency milling train can put into operation, and the fast quick-recovery of rolling line temporarily produces.
Calculation method, process involved in device internal calculation unit described in the utility model, specially hot-strip are raw
By the method for theoretical calculation jettisoning static reactive power compensator SVC in producing line milling train alternating-current-alternating-current frequency conversion system urgency situation, specifically by
Following steps are constituted:
S1: minimum voltage and ceiling voltage when determining the alternating-current-alternating-current frequency conversion system steel rolling of the side 35kV: alternating-current-alternating-current frequency conversion system requires to roll
Minimum voltage when steel produces under peak load is not less than 0.95 times of voltage rating 35kV, and ceiling voltage when minimum load is not
More than 1.1 times of voltage rating 35kV.It acts as basic conditions.In the present embodiment, voltage rating 35KV, then according to transformation
Device no-load voltage ratio calculates high side voltage, and minimum voltage is not less than 33.25KV, and ceiling voltage is no more than 38.5KV.
S2: maximum voltage when 110kV bus whole load zero load is determined: by the comprehensive 110kV for protecting background query of high pressure
Ceiling voltage is 117kV in the historical record of side.It acts as basic calculation conditions.
S3: it calculates the voltage value determined in the minimum and maximum situation of 110kV bus institute's on-load: calculating steel rolling maximum most
Voltage value when Smaller load.It acts as basic calculation conditions, calculate step to be crucial.
(1) Qmax, Qmin and Uk% are determined
As shown in fig. 6, according to 35KV original Design cooling load (the automatically controlled charter content that designing institute is given when Hot Line is built)
Directly acquire maximum active Pmax, minimum idle Qmax, by the minimum active Pmin of historical experience value, minimum idle Qmin, and
Uk%, and the design of rolling line load system apparent energy Smax and Smin is calculated.
(2) power supply system line resistance R is calculatedT
RT: substation's GIS switch outlet to the sum of the line and transformer resistance for loading high-voltage switch gear.Line is ignored in this calculating
Road resistance value；
Δ Ps: kW is lost in three-phase shortcircuit；Being looked into transformer nameplate parameter list (Fig. 5) is 234.1kW；
UN: transformer rated line voltage kV；
SN: Three-Phase Transformer rated capacity kVA, data source is transformer nameplate parameter list.
(3) power supply system line reactance X is calculatedT:
Us%: the short-circuit voltage percentage value of transformer (takes Us%=Uk%, 11.9) being looked into transformer nameplate parameter list is；
Transformer impedance X=R is released by (1) (2)T+jXT；
(4) when calculating minimum and maximum load, low-pressure side bus reduction to the minimum and maximum voltage value in high-pressure side
U1: main transformer high-side system voltage passes through ceiling voltage in the comprehensive side the 110kV historical record for protecting background query of high pressure
For 117kV；
△ Umax: pressure drop of the busy hour reduction to main transformer high-pressure side route and main transformer；
△ Umin: pressure drop of the reduction to main transformer high-pressure side route and main transformer when minimum load；
Pmax and Pmin is minimum and maximum bearing power；
Qmax and Qmin is that minimum and maximum load is idle, and numerical value is shown in step S3 (1)；
R=R in formulaT, X=XT。
S4: the equipment minimum safe voltages such as the main transformer low-pressure side bus institute band rectifier transformer and highest safety electricity are determined
Pressure: it is shown in the case where SVC investment according to background monitoring acquisition and recording, determines bus ceiling voltage and minimum voltage；It is made
With for basic design conditions, it is necessary to meet the requirement of step S1.In the present embodiment, 35KV bus ceiling voltage is when minimum load
37.79KV, busy hour minimum voltage are 33.98KV.
S5: calculating the reasonable gear for determining upper level main transformer: being required according to pressure regulation, when by the inside S1 minimum load
Ceiling voltage U2NCalculate gained.
Low-pressure side bus voltage (U when pressing minimum load2Nmin, 35KV bus ceiling voltage 37.79kV is taken by S4 step), really
Determine tap voltage U1T.Formula is as follows:
Immediate tap (looked into transformer nameplate parameter list, calculated value close to 2 grades of voltage values of transformer) is selected, really
Determine high voltage side of transformer voltage UT, as 2 grades of voltage value 119625V, the practical no-load voltage ratio of transformer after selection:
After gear selection, according to above-mentioned no-load voltage ratio formula, U ' is recalculated1min, verify whether that meeting voltage ripple of power network wants
It asks.
In the present embodiment, according to transformer nameplate parameter, the final gear that calculates is 2 grades (former specified gear is 6 grades), is made
Prepared with to need the S6 of compensation capacity to do calculating for Rolling production busy hour.
S6: it calculates and determines the capacitive reactive power Qc for needing the fixation compensated: according in the minimum voltage requirement and S5 inside S1
The gear and no-load voltage ratio K in faceT, calculate and go out in conjunction with the active and idle data inside S3；By busy hour pressure regulation requirement, determine
Condenser capacity.
No-load voltage ratio KTTo timing, QcFilter compensation capacity formula are as follows:
U2max: it is chosen according to S4 step after compensating preceding busy hour low-pressure side voltage value 33.98kV, is become multiplied by transformer
Than voltage of the reduction to the on high-tension side side 110kV；
Xε: route and transformer induction reactance (after ignoring line impedance, transformer impedance X=Xε)；
U′2max: 35kV voltage side requires the voltage kept after compensation, takes 35kV；Busy hour high voltage side of transformer electricity
Pressure value；
KT: transformer voltage ratio.
It acts as the capacity for determining capacitive reactive power fixed inside the SVC static compensator for needing to put into and group number are (existing
There are tetra- groups of fixations of H3, H5, H7, H11 to make compensation capacitor).
S7: it determines the filter FC group number of investment: being determined according to the capacitive reactive power Qc of S6 fixation calculated in such spy
Very in emergency circumstances, specific selection determines the filter for needing specifically to put into according to live practical filter configuring condition
FC group number and title.22.08- is filtered according to the practical reactive compensation capacity configuration of filter apparatus, such as H3 when selection
10.42MVar takes 10.42MVar to be calculated.
S8: whether effect investment filter FC group number and capacity Q meet network voltage requirement: counter to push away effect with formula in S6
Test the voltage in the case of the capacitive reactive power Qc of fixation input by S7 whether meet inside S4 listed by voltage requirement (be more than or equal to
33.98, it is less than or equal to 33.79kV, worst condition does not allow more than voltage limit in S1 step).It is such as unsatisfactory for, then returns to S3
Step is confirmed and is calculated to supplemental characteristics such as power supply system Qmax, Qmin and Uk% again.
Pass through above-mentioned S1~S8 step and calculation process, the power electronic control system in SVC system of the utility model
Above equipment is cast aside in time after there is any damage with 6 series compensation reactors, utilizes fixed capacitive reactive power Qc and upper one
Grade main shift, the requirement of system voltage stability bandwidth, reactive factor requires and live alternating-current-alternating-current frequency conversion system wants voltage
It asks；Reactive power matching (the switching group number and capacity of fixed capacitive reactive power Qc) is carried out after COMPREHENSIVE CALCULATING, transformer gear
To match, the matching of system power factor and steel rolling alternating-current-alternating-current frequency conversion system voltage matches are not raised and lowered to both meet network voltage,
Power system reactive power factor does not reduce, the requirement of alternating-current-alternating-current frequency conversion system voltage, and not damaging the other power consumer electricity consumptions of the power grid need to
Summation reduces electric network active power output.
In actual production because there is the transformer gear design comparison of individual models narrow, there can also be Optimization Steps,
The calculated results for being exactly above-mentioned S1~S8 from practice carry out further correcting fine tuning in actual needs, most
Meet live Rolling production requirement eventually.In such a case, it is possible to using the method for embodiment 2.As shown in fig. 7, embodiment 2
In, further include S9~S11 other than above-mentioned S1~S8 step:
S9: scene whole load restoration power transmission production；
S10: voltage ripple of power network situation and power factor change situation when actually looking at Rolling production: pass through background monitoring
Real-time display, sees whether voltage fluctuation meets the busbar voltage fluctuation section having in the case of SVC investment in S4 step, power factor
Whether situation of change is in 0~1.
S11: situation is fluctuated according to S10 virtual voltage, adjustment is modified to upper level main transformer gear: and then realize
The normal Rolling production of alternating-current-alternating-current frequency conversion system.Concrete operations are as follows: if voltage fluctuation is unsatisfactory in the case of having SVC to put into S4 step
Busbar voltage fluctuation section, then the adjustment of virtual voltage gear meets high toward low-key, it is low toward it is high fall principle carry out, such as: it is real
It is on the contrary by gear tune if border ceiling voltage needs to turn down upper level transformer gear beyond the 37.79KV in S4 step
It is high.
The utility model calculation method effectively passes through in hot-rolled strip production line milling train alternating-current-alternating-current frequency conversion system urgency situation
Theoretical calculation jettisoning static reactive power compensator SVC.In production operation, after hot-strip rolling line SVC damage, pass through above method
After calculating, selecting transformer gear is 2 grades, selects filter H3, H5. smoothly to put into production, does not cause non-programmed halt.
It should be noted that the specific embodiment of the utility model is described in detail the utility model,
For those skilled in the art, it is carried out without departing substantially from the spirit and scope of the utility model various
Obvious change is within the protection scope of the utility model.
Claims (6)
1. a kind of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC's quickly resumes production device, it is characterised in that: including power supply unit and and
Display unit, input unit, the control output unit of device internal calculation unit connection；The power supply unit is to this dress
It sets and is powered；The display unit data derive from device internal calculation unit；The input unit will input or
The data of acquisition are transferred to the device internal calculation unit；The device internal calculation unit combines the number of acquisition input
According to the reactive compensation Qc that should be put into after calculating AC/AC (alternating current) variable-frequency rolling line SVC damage；The control output unit is by the device
The model of internal calculation unit output reaches external device controller.
2. the device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC according to claim 1, it is characterised in that: institute
The display unit and input unit stated are liquid crystal control panels.
3. the device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC according to claim 1, it is characterised in that: institute
The signal that device internal calculation unit exports is reached external device controller by the control output unit stated, including by each filtering
Device puts into/exits control signal and exports to the control device of each group filter, and exports system main transformer gear control letter
Number arrive control device for transformer.
4. the device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC according to claim 1, it is characterised in that: also
Including manual correction unit, for the setting modification of device intrinsic parameter.
5. the device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC according to claim 4, it is characterised in that: institute
The manual correction unit stated is directly connected to the device internal calculation unit and carries out parameter modification.
6. the device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC according to claim 4, it is characterised in that: institute
The parameter modification of the manual correction unit connection the stated input unit and then realization to device internal calculation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920286868.0U CN209472398U (en) | 2019-03-07 | 2019-03-07 | A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920286868.0U CN209472398U (en) | 2019-03-07 | 2019-03-07 | A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC |
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| Publication Number | Publication Date |
|---|---|
| CN209472398U true CN209472398U (en) | 2019-10-08 |
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| CN201920286868.0U Expired - Fee Related CN209472398U (en) | 2019-03-07 | 2019-03-07 | A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176774A (en) * | 2019-03-07 | 2019-08-27 | 日照钢铁控股集团有限公司 | A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC |
-
2019
- 2019-03-07 CN CN201920286868.0U patent/CN209472398U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176774A (en) * | 2019-03-07 | 2019-08-27 | 日照钢铁控股集团有限公司 | A kind of device that quickly resumes production of AC/AC (alternating current) variable-frequency rolling line jettisoning SVC |
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