CN1003626B - Power Frequency Induction Furnace Balance Power Regulating Circuit - Google Patents
Power Frequency Induction Furnace Balance Power Regulating Circuit Download PDFInfo
- Publication number
- CN1003626B CN1003626B CN85107606.8A CN85107606A CN1003626B CN 1003626 B CN1003626 B CN 1003626B CN 85107606 A CN85107606 A CN 85107606A CN 1003626 B CN1003626 B CN 1003626B
- Authority
- CN
- China
- Prior art keywords
- power
- furnace
- frequency induction
- induction furnace
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001105 regulatory effect Effects 0.000 title abstract description 8
- 230000006698 induction Effects 0.000 title abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000033228 biological regulation Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000016507 interphase Effects 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Discharge Heating (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a power supply balance power regulating circuit for a power frequency induction furnace, which is suitable for power requirements of different processes of heat preservation, furnace baking, forced smelting and the like of the power frequency induction furnace. Because the balancer adopts a star connection method, the power regulation of the electric furnace shows greater flexibility: the accident overcurrent brought to the system by the short circuit of the electric furnace and the out-of-control cos phi is limited, and the requirement on an electric system is reduced; the reliability and the accident resistance capability of the smelting equipment are improved; the starting impact is small, and the automatic adjustment is easy to realize.
Description
The present invention is a kind of circuit without voltage adjusting device adjusting line frequency furnace operate power, is particularly suitable for regulating under deposite metal and other running statuses usefulness of power.
The three-phase balancer of existing line frequency furnace is triangle and connects (referring to accompanying drawing 1).The major defect that this connection exists is: the main contactor life-span is short; It is difficult to close a floodgate; Because changing, powerfactorcos causes system's overcurrent easily; Need add voltage adjusting device and regulate power.
The power adjustments of existing line frequency furnace is to select for use general electrician's voltage adjusting device to solve.The shortcoming of induction voltage regulator is to have rotation partly, makes difficulty, the cost height; The shortcoming of tapped transformer is to consume more switchgear, needs to safeguard the range limited system of voltage-regulation; The shortcoming of autotransformer is that adjustable range is little, and contact partly often needs to safeguard.The method of these several adjusting power all makes the electric induction furnace manufacturing cost higher.
In view of the problem that prior art exists, the objective of the invention is to seek a kind of need not be special voltage adjusting device but utilize the three-phase equilibrium device of electric induction furnace own to realize the regulating circuit of furnace power balance.The technical characterictic that claim 1 provides has reached above-mentioned purpose.The present invention is a kind of power supply balance adjustment circuit that is used for line frequency furnace, it is characterized in that interphase reactor, balanced capacitor and electric furnace three connect (referring to accompanying drawing 2) with star connection, its mid point is earth-free, control the voltage that is added on the body of heater by control capacittance, remain X in the adjustment process
C=X
L
Line frequency furnace all needs to carry out temperature-power control in fusing, insulation, baker, blowing out various running statuses such as bank up a fire.Power adjustments principle of the present invention is referring to accompanying drawing 3.Electric furnace moves (voltage, current phasor figure are referring to accompanying drawing 4,5) under rated load power.X is arranged this moment
L=Xc=
Quantitative relation.Electric furnace moves under non-rated power, is by changing the parameter X of operating interphase reactor to the power adjustments in the load
LAnd the parameter X c of balanced capacitor, and keep both to equate (vector correlation is seen accompanying drawing 6,7) realized.As can be seen from Figure: the star connection mid point N ' that the floats variation of position generation in the drawings is a voltage
Variation.Voltage
, can 8 calculate acquisition with reference to the accompanying drawings.Among the figure:
Z
L=jX
L
Z
C=-jX
C
Try to achieve:
With following formula as can be seen,
With
Same-phase,
Following formula shows that the voltage that is added on the body of heater controls by regulating Xc.During three-phase equilibrium, the voltage that is added in stove end inductor is supply voltage
Doubly.In adjustment process, three-phase current is in non-equilibrium state, and unsymmetrical current △ I can 9 calculate with reference to the accompanying drawings:
△I＝I
A-I
C
The maximum of asking △ I at first is the parametric equation of finding the solution about angle α
1/2-sinα+cosαsin（150-α）＝0
Try to achieve: α=65 ° 37 '
By the uneven degree that α obtains, △ I can reach 28% of electric furnace rated value when maximum, usually in allowed band.
The influence that furnace power factor angle φ changes system can 10 be calculated as follows with reference to the accompanying drawings:
Wherein: Z=R(cos
2φ+jcos φ sin φ)
φ＝arctgR/X
The advantage that compared with the prior art the present invention has is that the furnace power adjustable range is wide, is not subjected to power limitations, is suitable for being incubated, the requirement of explained hereafter aspect such as baker, Qiang Lian, has shown greater flexibility; Because X
L, X
CExistence, limited electric furnace short circuit and the cos φ accident overcurrent of bringing to system out of control, reduced requirement to electrical system, improved the reliability and the accident defensive ability/resistance ability of smelting equipment; It is little to start impact, can directly start; Circuit has carried out suitable simplification, is easy to realize automatic adjusting.
In view of this balance power regulation circuit has above-mentioned all advantages, believe that the present invention will have good practical prospect in the field of adopting line frequency furnace.
Accompanying drawing thes contents are as follows:
Fig. 1 is the three-phase balancer schematic diagram of delta connection.
Fig. 2 is the three-phase balancer schematic diagram of star connection.
Fig. 3 is the power adjustments electrical schematic diagram.
Fig. 4 is the polar plot of each phase voltage under poised state.
Fig. 5 is the polar plot of each phase current under poised state.
Fig. 6 is electric furnace each phase voltage vector when moving under non-rated power state.
Fig. 7 is electric furnace each phase current polar plot when moving under non-rated power state.
Fig. 8 is an offset voltage
Calculating chart.
Fig. 9 is the unsymmetrical current calculating chart.
Figure 10 changes systematic influence degree calculating chart for powerfactorcos.
The embodiment of the invention is as follows:
Certain line frequency furnace important technological parameters is:
Rated capacity 3T
Inductor rated power 750KW
Inductor rated voltage 500V
Transformer capacity 1250KVA
Transformer secondary voltage 320V
Compensation condenser capacity 4520KVAr
Reactor 320V 1500A
Balanced capacitor YY0.4～10,750KVAr
The main contactor vacuum contactor
Balance pressure regulation contactor CJO40.22 level
Compensation condenser is regulated 9 groups of 2360KVAr
Electric furnace uses an automatic regulator, regulates electric furnace and power factor.Adjuster is made up of panel (comprising indicating device, mains switch, manual selection switch, button, power knob etc.) and terminal block.Terminal block will
Insert, as the test side.Adjuster has two groups of control lines, controls the automatic adjusting of the power adjustments and the power factor of electric furnace respectively.Totally 8 groups of furnace power factor compensation condensers, the adjusting of capacity below 384KVAr are partly by the geometric progression grouping.Furnace power is regulated totally 22 grades, regulates 2 capacitors for every grade, has 2 capacitors to be in and waits to drop into, and the capacitor that withdraws from enters when waiting to drop into state, formerly waits to drop into capacitor and is attempted by reactor one side immediately.So just to balanced capacitor Xc, interphase reactor X
LRegulate simultaneously, also promptly regulated furnace power.
Claims (1)
1, a kind of power supply balance power regulation circuit that is used for line frequency furnace, it is characterized in that interphase reactor, balanced capacitor and electric furnace three connect with star connection, its mid point is earth-free, controls the voltage that is added on the body of heater by control capacittance, remains X in the adjustment process
C=X
L
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107606.8A CN1003626B (en) | 1985-10-14 | 1985-10-14 | Power Frequency Induction Furnace Balance Power Regulating Circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107606.8A CN1003626B (en) | 1985-10-14 | 1985-10-14 | Power Frequency Induction Furnace Balance Power Regulating Circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85107606A CN85107606A (en) | 1987-05-06 |
| CN1003626B true CN1003626B (en) | 1989-03-15 |
Family
ID=4795693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85107606.8A Expired CN1003626B (en) | 1985-10-14 | 1985-10-14 | Power Frequency Induction Furnace Balance Power Regulating Circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003626B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109668447A (en) * | 2018-12-26 | 2019-04-23 | 河北四通新型金属材料股份有限公司 | A kind of main frequency furnace power factor balance automatic regulating apparatus |
-
1985
- 1985-10-14 CN CN85107606.8A patent/CN1003626B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85107606A (en) | 1987-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4320245A (en) | Process and apparatus for arc control in arc furnaces | |
| CN1003626B (en) | Power Frequency Induction Furnace Balance Power Regulating Circuit | |
| CA2740319A1 (en) | Current supply arrangement with a first current supply device and a second current supply device | |
| US6011381A (en) | Three-phase auto transformer with two tap changers for ratio and phase-angle control | |
| US20030098301A1 (en) | Method for electrical heating of furnaces for heat treatment of metallic workpieces | |
| CN219960126U (en) | Current balancing device of power generation system tie line | |
| US3412317A (en) | Phase balancing | |
| CN113904339A (en) | Phase-shifting transformer | |
| SU862313A1 (en) | Symmetrical device for three-phase four-wire electric network | |
| JP3938903B2 (en) | Single-phase three-wire voltage regulator | |
| CN103973126B (en) | Light the device of the thin bar being constructed from a material that be electrically conducting, especially silicon thin bar | |
| WO2019198843A1 (en) | Three-phase power compound transformer with harmonic active filter function using three-phase power autotransformer | |
| US3249850A (en) | Adjustable voltage autotransformer | |
| CN1006109B (en) | three-phase to two-phase and three-phase balance transformer | |
| SU1248859A1 (en) | Device for traction power supply of alternating current electrified railways | |
| SU1149446A1 (en) | Short network for three-phase six-electrode electric arc furnace with rectangular pot | |
| US1535595A (en) | Negative-phase-sequence balancer for polyphase furnaces | |
| SU746810A1 (en) | Device for connecting adjusted electric power transmission line to ac mains | |
| SU1132323A1 (en) | Electric power supply device | |
| DWINELL | System for automatically switching transformer coupled lines[Patent] | |
| US1723911A (en) | System of electrical distribution | |
| US1454847A (en) | Salt-bath furnace | |
| SU817853A1 (en) | Device for transverse regulating of voltage in closed electric circuit | |
| SU1505804A1 (en) | A.c. traction power supply device | |
| SU837230A1 (en) | Device for controlling a-c voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Chongqing eighteen smelting Sichuan electrical and mechanical engineering company Applicant after: Zhang Yubin Address before: Sichuan Pengxian Jianjiang Machinery Factory Applicant before: Zhang Yubin |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT ADDRESS; FROM: SICHUAN PROVINCE PENG TOWN JIANJIANG MACHINERY PLANT TO: THE EIGHTEENTH ELECTROMACHANICAL ENGINEERING CO., LTD., CHONGQING CITY, SICHUAN PROVINCE |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |