CN100455967C - Simulation analogue regulator for DC electric arc furnace control and protective function - Google Patents
Simulation analogue regulator for DC electric arc furnace control and protective function Download PDFInfo
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- CN100455967C CN100455967C CNB2005100278183A CN200510027818A CN100455967C CN 100455967 C CN100455967 C CN 100455967C CN B2005100278183 A CNB2005100278183 A CN B2005100278183A CN 200510027818 A CN200510027818 A CN 200510027818A CN 100455967 C CN100455967 C CN 100455967C
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Abstract
The disclosed debugging device of analog simulation includes power circuit, DC analog signal generation circuit, artificial circuit for given current, artificial circuit for given voltage, numbers of artificial circuit of current feedback signal, numbers of artificial circuit of voltage feedback signal, and artificial circuit for simulating pressure of oil cylinder. In off line state, the invention can carry put tests of arc control and relevant protection models including arc strike, short circuit, inversed breaking off arc, insulating material, leak of hydraulic cylinder of DC electric arc furnace. The invention reduces on line debugging time effectively, and solves issues, which are difficult to carry out online simulation tests for some protection functions.
Description
Technical field
The present invention relates to a kind of simulation analogue regulator, relate in particular to a kind of device that is used for the analogue simulation debugging of DC electric arc furnace electrode lifting and the whole interlock of rectification control system.
Background technology
Fig. 1 forms for the direct current electric arc furnace fundamental circuit, smelt the dc source equipment component and mainly form, form energy supply source to stove by rectifier transformer, rectifier, reactor, water-cooled cable and contact tube (or conductive cross arm), electrode jaw, graphite electrode (negative electrode) and hearth electrode (anode).The control of smelting electrical power is arc power control, and main by regulating arc voltage---by rise fall of electrodes control (current general employing hydraulic lifting form), regulating arc current simultaneously---controlled by rectifier current and realized.
Arc current be each rectifier current and, by formula 1 expression.
I
Arc=∑ I
i(formula 1)
Wherein i ∈ 1,2 ..., n}, n are the total platform number of rectifier, I
iBe each rectifier current.
Arc voltage Uarc (V) theoretical value can be by formula 2 expressions.
U
Arc=E
p* l+V
e(formula 2)
E wherein
pBe the average potential gradient ≈ 1.0V/mm of arc column (because of the influence of the working of a furnace and slag etc., actual in the scope of 0.5～2.0V/mm); L is arc length (mm); V
eBe near other voltage drops=30～50V arc cathode pressure drop+anode drop+electrode.
But in actual applications, arc voltage calculates the general formula 3 that adopts.
U
Arc=U
j-(R*I
Arc+ r
j* I
j) (formula 3)
Wherein: U
j=min (U
i), i ∈ 1,2 ..., n}, n are the total platform number of rectifier; I
jBe corresponding rectifier current value; R is a line impedance; r
jBe the corresponding internal resistance of rectifier.
Rise fall of electrodes control and rectifier current are controlled to be the core control section of direct current electric arc furnace; it also is the control difficult point place of direct current electric arc furnace; above-mentioned arc voltage and arc stream control and not exclusively separate; there is close matching relationship, thereby formed electric arc control and relevant protection control functions such as striking, short circuit, inversed breaking off arc, insulating materials, hydraulic cylinder leakage.
The debugging of above-mentioned control and defencive function is similarly the direct current electric arc furnace technological difficulties.The direct-on-line debugging has very big risk, jumps equipment breakdowns such as electricity as causing electrode fracture, rectifier overcurrent; Simultaneously, some function---particularly the defencive function under some unit exception situations is difficult to emulation testing.
Current in the system debug process, generally adopt the off-line simulation test, but difficulty is in the simulation of voltage, electric current and rise fall of electrodes oil cylinder working-pressure feedback signal.The feedback signal simulation has two kinds of ways usually again, and a kind of is the outer signal source, and another kind is to simulate above-mentioned feedback signal by constrained variable in control system.But all there is following point in which kind of mode no matter: 1. complicated operation; 2. be difficult to the emulation dynamic process; The matching relationship of 3. more difficult emulation dynamic process.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of control of direct current electric arc furnace and the simulation analogue regulator of defencive function; this device is simple to operate; the dynamic process of energy emulation feedback signal and the relation of the dynamic fit between signal; conveniently realize the complete test of off-line of Electrical Arc in DC Electric Arc control and relevant defencive function, and effective compressibility debug time.This device solves signal imitation in traditional system debug process (external signal source or software inhouse variable force) complicated operation, feedback with given synchronously and the dynamic process that the feeds back problem that is difficult to emulation.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
The control of direct current electric arc furnace of the present invention and the simulation analogue regulator of defencive function comprise:
Power circuit, it provides dc source for circuit;
The DC simulation signal generating circuit, it provides a fixing d. c. voltage signal.
The given artificial circuit of electric current, it is connected with described DC simulation signal generating circuit, exports an adjustable voltage;
A voltage given artificial circuit, it is connected with described DC simulation signal generating circuit, exports an adjustable voltage;
Several current feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal;
Some voltage feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal;
Simulation oil cylinder pressure feedback circuit, it is connected with described power circuit, DC simulation signal generating circuit, and it exports an adjustable voltage;
Further, the present invention also comprises:
Control and holding circuit, it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current signal feedback circuits,
Signal switching circuit, it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current feedback signal artificial circuits, is used to realize the switching between actual signal and the simulate signal.
Back-up circuit, it is connected with described power circuit, DC simulation signal generating circuit, comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal; When above-mentioned voltage, when current simulations is given or break down in emulation feedback and pressure emulation feedback signal loop, available this back-up circuit is replaced.
The present invention is intended to emulation direct current furnace arc voltage and the given signal of electric current, rectifier voltage and electric current with above-mentioned step given dynamic process and rise fall of electrodes oil cylinder working-pressure signal.By the various various combination situations of above-mentioned given and feedback signal of emulation, realize the direct current furnace core control system---rise fall of electrodes control and the control model of rectification control system and the emulation testing of various control and defencive function.Adopt the present invention; under off-line state, can carry out electric arc control and the relevant tests (except voltage, the test of current PI D control characteristic) of protecting model such as direct current electric arc furnace striking, short circuit, inversed breaking off arc, insulating materials, hydraulic cylinder leakage; can compress online debug time effectively, and solve the problem that some defencive functions are difficult to the in-circuit emulation test.
Description of drawings
Fig. 1 is existing direct current electric arc furnace basic structure schematic diagram.
Fig. 2 is the circuit module structural representation of the simulation analogue regulator of control and defencive function.
Fig. 3 is a particular circuit configurations schematic diagram of the present invention.
Fig. 4 is that emulation voltage is set the step signal schematic diagram.
Fig. 5 is that simulated current is set the step signal schematic diagram.
Fig. 6 is the particular circuit configurations schematic diagram of given integrating circuit.
Fig. 7 is the input-output characteristic schematic diagram of given integrating circuit.
Fig. 8 is the schematic diagram of signal switching circuit.
Fig. 9 is the concrete structure schematic diagram of signal switching circuit.
Figure 10 is the structural representation of interlock protection circuit.
The specific embodiment
In conjunction with Fig. 2, shown in Figure 3, the control of direct current electric arc furnace of the present invention and the simulation analogue regulator of defencive function comprise:
Power circuit, its output ± 24V DC voltage:
The DC simulation signal generating circuit, it provides+the 10V d. c. voltage signal.
The given artificial circuit of electric current, it is connected with described DC simulation signal generating circuit, and 0-10V is adjustable in output; Described output is by adjustable potentiometer R among Fig. 3
2Regulate, and by voltmeter V among Fig. 3
2Indication; No matter emulation or the actual given signal of electric current all adopts voltage signal in this specific embodiment, control system inside is done conversion again, as the corresponding maximum operating currenbt 36KA of corresponding 0A, the 10V of 0V etc.
A voltage given artificial circuit, it is connected with described DC simulation signal generating circuit, adjustable voltage in the output 0-10V; Described output is by adjustable potentiometer R among Fig. 3
1Regulate, and by voltmeter V among Fig. 3
1Indication.
Several current feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and the overall transfer function of described given integrating circuit is:
G(s)＝U
o(s)/U
i(s)＝1/Ts+1
Wherein: integration time constant T=(R
4+ R
p) C, realize by adjustable potentiometer R among Fig. 3
7, R
8, R
9Or R
10The voltage signal of setting up is (by voltmeter V among Fig. 3
7, V
8, V
9Or V
10Indication) carry out integration, thus the artificial actual current feedback signal.The saturated output of its integration simultaneously is adjustable potentiometer R
7, R
8, R
9Or R
10The magnitude of voltage of setting up, thus further the emulation overcurrent is (when by adjustable potentiometer R
7, R
8, R
9Or R
10The voltage signal of setting up is greater than by adjustable potentiometer R
2The given signal of setting up of simulated current) or electric current can't reach set-point (when by adjustable potentiometer R
7, R
8, R
9Or R
10The voltage signal of setting up is less than by adjustable potentiometer R
2The given signal of setting up of simulated current) current anomaly situation such as.In addition, when regulating adjustable potentiometer R
PWhen the integration time constant T that each simulated current is fed back was inconsistent, also further analog current fed back nonsynchronous current anomaly situation.
Some voltage feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and the overall transfer function of described given integrating circuit is:
G(s)＝U
o(s)/U
i(s)＝1/Ts+1
Wherein: integration time constant T=(R
4+ R
p) C, this integrating circuit is realized by adjustable potentiometer R among Fig. 3
3, R
4, R
5Or R
6The voltage signal of setting up is (by voltmeter V among Fig. 3
3, V
4, V
5Or V
6Indication) carry out integration, thus the artificial actual voltage feedback signal.The saturated output of its integration simultaneously is adjustable potentiometer R
3, R
4, R
5Or R
6The magnitude of voltage of setting up, thus can further emulation overvoltage (when by adjustable potentiometer R
3, R
4, R
5Or R
6The voltage signal of setting up is greater than by adjustable potentiometer R
1The emulation voltage given signal of setting up) or voltage can't reach set-point (when by adjustable potentiometer R
3, R
4, R
5Or R
6The voltage signal of setting up is less than by adjustable potentiometer R
1The emulation voltage given signal of setting up) electric voltage exception situation such as.In addition, when regulating adjustable potentiometer R
PWhen the integration time constant T that each emulation voltage is fed back was inconsistent, also further aanalogvoltage fed back nonsynchronous electric voltage exception situation.
Oil cylinder working-pressure feedback artificial circuit, it is connected with described power circuit, DC simulation signal generating circuit, its output 0-10V adjustable voltage; Described voltage is by adjustable potentiometer R among Fig. 3
11Regulate, and by voltmeter V among Fig. 3
11Indication
Control and holding circuit, it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current feedback signal artificial circuits;
Signal switching circuit, it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current feedback signal artificial circuits, is used to realize the switching between actual signal and the simulate signal.
Back-up circuit, it is connected with described power circuit, DC simulation signal generating circuit, comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal; When above-mentioned voltage, when current simulations is given or break down in emulation feedback and pressure emulation feedback signal loop, available this back-up circuit is replaced (only needing to adjust accordingly in the wiring of signal switched system shown in Figure 9).
The power circuit of this device can use the alternating current 220V power supply, generally can directly draw power supply in switch board, and this alternating current 220V power supply is by breaker (Q
0, the band auxiliary contact), output ± 24V dc source behind transformer transformation and rectification circuit again.
The loop quantity of described current feedback signal artificial circuit, voltage feedback signal artificial circuit is determined: the feeder number amount depends on the quantity of the platform number and the rise fall of electrodes hydraulic cylinder of rectifier.General direct current electric arc furnace configuration 2-4 platform rectifier, every rectifier is actual to have a voltage feedback signal and a current feedback signal; Rise fall of electrodes disposes a pressure feedback signal generally by a Driven by Hydraulic Cylinder.In addition, given and given analogue simulation signal of public electric current of utility voltage of configuration.This specific embodiment disposes 12 analogue simulation signal circuits (a given artificial circuit of electric current, a voltage given artificial circuit, four current feedback signal artificial circuits, four voltage feedback signal artificial circuits, oil cylinder working-pressures feed back artificial circuit, a space signal loop) altogether by four rectifier configurations.
1, analogue simulation signal form
The general rectifier virtual voltage that is detected by PT and CT all is converted to 0-10V direct current signal (corresponding 0-100% range) with current signal and feeds back to control system; Equally, rise fall of electrodes cylinder pressure signal is converted to 0-10V direct current signal (corresponding 0-100% range) through pressure transmitter and feeds back to control system; Voltage, current setting value also adopt 0-10V direct current signal (corresponding 0-100% setting value); So this device simulation voltage, electric current, pressure feedback signal and voltage, current settings simulate signal also adopt 0-10V direct current signal (corresponding 0-100% range or setting value).
2, DC simulation signal generating circuit:
The generation circuit of 0-10V DC simulation signal is referring to Fig. 3, wherein R
0Be 1.4K Ω, potentiometer R
1-R
12Two stiff end resistance values are 12K Ω, when ignoring voltage pointer gauge (V
1-V
12) internal resistance and comprise back connection circuit input resistance (generally the being far longer than 10K Ω) influence of control system analog quantity tablet, then A point current potential:
So V among the figure
S1, I
S1, V
11-V
41, I
11-I
41, P
1And back-up circuit all can pass through potentiometer R
1-R
12In the 0-10V scope, regulate separately continuously.Each 0-10V DC voltage analog signal loop disposes a 0-10 DC voltage pointer gauge (V simultaneously
1-V
12), feed back maximum and (do not indicate dynamic process in order to rectifier voltage, the current simulations given (referring to 4 and 5) simulated of indication and voltage, current simulations, referring to Fig. 7) and rise fall of electrodes cylinder pressure emulation feedback signal value, and back-up circuit voltage analog value, corresponding 100% range of+10V or setting value.
3, voltage given artificial circuit, the given artificial circuit of electric current:
Usually control system is sent to identical voltage of rectifier and current setting value (being arc voltage and current setting value sometimes), (current setting value is inconsistent even some direct current furnace has inclined to one side arc control model, generally differ 5%), but debugging is incited somebody to action for control system, adopts identical voltage and current setting value to meet the demands fully.
The step signal form is adopted in voltage and current setting value emulation, passes through K switch
0Control (referring to Fig. 3).Work as K
0Close relay J K
0With JK
2Must be electric, voltage given V
S2With the given I of electric current
S2Jump to V by 0
S1With I
S1(rising edge shown in Fig. 4,5); Work as K
0Disconnect, then relay J K
0With JK
2Dead electricity, voltage given V
S2With the given I of electric current
S2By V
S1With I
S1Jump to 0 (trailing edge shown in Fig. 4,5).
Wherein, V
S0With I
S0For 0-10V adjustable, as shown in Figure 3, by adjustable potential meter R
1With potentiometer R
2Realize, and by voltmeter V
1, voltmeter V
2Indication.
4, current feedback signal artificial circuit, voltage feedback signal artificial circuit
In conjunction with Fig. 3, shown in Figure 6: voltage of the present invention, current feedback signal artificial circuit are mainly given integrating circuit, and described given integrating circuit is made up of following four parts: comparator, diode bridge, inverting integrator, phase inverter.
1. comparator (in-phase amplifier)
Work as R
1=R
2=R
3During=Rf, Ua=Ui+Uc
2. diode bridge
Realize voltage follow, Ub=Ua
Guarantee output violent change simultaneously ,-24V * Rp/ (R
9+ Rp)＜Ub＜+24V * Rp/ (R
9+ Rp)
3. inverting integrator
Uc＝-1/(R
4+Rp)∫Uidt
4. phase inverter
Uo＝-Uc
In sum, get Uo=1/ (R
4+ Rp) ∫ (Ui-Uo) dt is an inertial element, and its overall transfer function is:
G (s)=U
o(s)/U
i(s)=1/Ts+1 (formula 5)
Wherein: integration time constant T=(R
4+ R
p) C, can be by regulating R
p(formula 6)
Its input-output characteristic as shown in Figure 7.Key is: 1. U
oTo U
iSignal is done integration, emulation voltage process of rising or falling; 2. rising or descending slope (transitional processes time) are by potentiometer R
pAdjustable; 3. U
oMaximum is limited in U
i
5, oil cylinder working-pressure feedback artificial circuit
In conjunction with as shown in Figure 3, this circuit comprises adjustable potentiometer R
11With voltmeter V
11Electric arc furnaces is in smelting process under the normal condition; along with the rise fall of electrodes motion; oil cylinder working-pressure fluctuates within the specific limits; when pressure anomaly descends; the time span that foundation is different reaches the conditions such as corresponding relation with electric current and voltage, and distinguish of system is to have multi-form fault such as insulant or hydraulic pressure steel appearance leakage in the steel scrap and take corresponding protection to move.From pressure feedback signal emulation angle, direct regulator potentiometer R
11Can meet the demands.
6, signal switching circuit
The rectifier voltage of analogue simulation, electric current set-point and feedback signal and rise fall of electrodes cylinder pressure feedback signal are switched by relay with actual above-mentioned given and feedback signal.This circuit comprises joining K switch
1, relay J K
8-JK
19, during the system operate as normal, K switch among Fig. 3
1Open relay J K
1With Fig. 8 repeat circuit JK
8-JK
19Dead electricity, control system analog quantity tablet is by transfer relay JK
8-JK
19Normally closed contact 1-9,4-12 receive actual rectifier voltage, electric current set-point and feedback signal and rise fall of electrodes cylinder pressure feedback signal (Fig. 9); When system debug, run jointly and close K
1, relay J K
1With JK
8-JK
19Must be electric, control system analog quantity tablet is by transfer relay JK
8-JK
19Normal opened contact 5-9,8-12 receive the analogue simulation signal.
7, control and holding circuit (interlock protection)
For preventing in the normal smelting process of electric furnace, because of maloperation with emulation given with feedback signal incision control system, utilize the total input-wire circuit breaker Q
0Auxiliary contact and relay J K
1Normal opened contact 8-12 signal comes blockade system operation (parallel connection plays the dual fail-safe effect), referring to Figure 10.When carrying out simulative debugging, this is chain can to force cancellation by signal in control system, and debugging must recover after finishing immediately, is specially: as this device alternating current 220V power switch Q
0Close or Fig. 3 in working control signal and Simulation Control signal shift switch K
1After closing, switch Q
0Auxiliary contact or relay J K
1Contact with the 24V signal by digital quantity input point I
XXInput electrode lifting and rectification control PLC control system (referring to Figure 10), this analogue system of notice control system puts into operation, to realize corresponding chain and protection control (considering) in rise fall of electrodes and rectification Control System Design.
8, system mask and ground connection
Because of this analog regulator can be directly installed in the switch board, so analog feedback signal does not generally need to adopt shielded cable, then the actual feedback signal shielding line is not done the relay switching.This device power supply ground is connected with the direct corresponding earth point with control system in protection ground.
9, adopt 0-20mA or 4-20mA current signal as actual rectifier voltage, current feedback signal or rise fall of electrodes cylinder pressure, then only need to add behind given integrating circuit to join 0-10V DC signal to 0-20mA or 4-20mA current signal change-over circuit, simulate signal and actual signal relay switching part are constant.
Claims (9)
1, the simulation analogue regulator of the control of direct current electric arc furnace and defencive function is characterized in that, comprising:
Power circuit, it provides dc source for circuit;
The DC simulation signal generating circuit, it provides a fixing d. c. voltage signal;
The given artificial circuit of electric current, it is connected with described DC simulation signal generating circuit, exports an adjustable voltage;
A voltage given artificial circuit, it is connected with described DC simulation signal generating circuit, exports an adjustable voltage;
Several current feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal;
Some voltage feedback signal artificial circuits, it is connected with described power circuit, DC simulation signal generating circuit, respectively comprises a given integrating circuit, and described given integrating circuit carries out integration to the adjustable voltage signal;
Simulation oil cylinder pressure feedback circuit, it is connected with described power circuit, DC simulation signal generating circuit, and it exports an adjustable voltage.
2, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 1 and defencive function; it is characterized in that; also comprise a control and a holding circuit, it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current signal feedback circuits.
3, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 1 and defencive function; it is characterized in that; also comprise a signal switching circuit; it all is connected with described voltage given artificial circuit, the given artificial circuit of electric current, some voltage feedback signal artificial circuits, some current feedback signal artificial circuits, is used to realize the switching between actual signal and the simulate signal.
4, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 1 and defencive function, it is characterized in that, also comprise a back-up circuit, it is connected with described power circuit, DC simulation signal generating circuit, comprise a given integrating circuit, described given integrating circuit carries out integration to the adjustable voltage signal;
5, according to the control of claim 1 or 4 described direct current electric arc furnaces and the simulation analogue regulator of defencive function; it is characterized in that the given artificial circuit of described electric current, voltage given artificial circuit, several current feedback signal artificial circuits, several voltage feedback signal artificial circuits, oil cylinder working-pressure feedback artificial circuit, back-up circuit are provided with adjustable potentiometer, voltmeter, the relay that connects successively respectively.
6, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 1 and defencive function is characterized in that, described current feedback signal artificial circuit, voltage feedback signal artificial circuit are 4.
7, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 4 and defencive function; it is characterized in that the overall transfer function of described current feedback signal artificial circuit, voltage feedback signal emulation and the integrating circuit that back-up circuit adopted is:
G(s)＝U
o(s)/U
i(s)＝1/Ts+1
Wherein: integration time constant T=(R
4+ R
p) C.
8, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 3 and defencive function is characterized in that, described signal switching circuit comprises joining switch and some relays.
9, the simulation analogue regulator of the control of direct current electric arc furnace according to claim 2 and defencive function is characterized in that, described control and holding circuit comprise breaker, the relay that is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100278183A CN100455967C (en) | 2005-07-18 | 2005-07-18 | Simulation analogue regulator for DC electric arc furnace control and protective function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100278183A CN100455967C (en) | 2005-07-18 | 2005-07-18 | Simulation analogue regulator for DC electric arc furnace control and protective function |
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| CN100455967C true CN100455967C (en) | 2009-01-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8179145B2 (en) * | 2008-01-24 | 2012-05-15 | Siemens Industry, Inc. | Method and apparatus for testing AFCI device for series arc detection |
| CN101782321B (en) * | 2010-01-27 | 2012-09-05 | 上海金自天正信息技术有限公司 | Automatic regulating device of DC electric arc furnace electrode and control method thereof |
| CN102680536B (en) * | 2012-06-11 | 2013-10-09 | 西北工业大学 | Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply |
| CN114089127A (en) * | 2021-10-19 | 2022-02-25 | 广东电网有限责任公司广州供电局 | System and method for simulating arc discharge of transformer |
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|---|---|---|---|---|
| CN2365623Y (en) * | 1998-12-29 | 2000-02-23 | 乔天顺 | Automatic regulator adapted to arc furnace current |
| US6421366B1 (en) * | 1999-04-23 | 2002-07-16 | Sms Demag Ag | Method and device for supplying an electric arc melting furnace with current |
| JP2003083680A (en) * | 2001-09-10 | 2003-03-19 | Toshiba Corp | Electrode lifting apparatus for arc furnace |
| JP2004257703A (en) * | 2003-02-27 | 2004-09-16 | Takuma Co Ltd | Electric melting furnace controller |
-
2005
- 2005-07-18 CN CNB2005100278183A patent/CN100455967C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2365623Y (en) * | 1998-12-29 | 2000-02-23 | 乔天顺 | Automatic regulator adapted to arc furnace current |
| US6421366B1 (en) * | 1999-04-23 | 2002-07-16 | Sms Demag Ag | Method and device for supplying an electric arc melting furnace with current |
| JP2003083680A (en) * | 2001-09-10 | 2003-03-19 | Toshiba Corp | Electrode lifting apparatus for arc furnace |
| JP2004257703A (en) * | 2003-02-27 | 2004-09-16 | Takuma Co Ltd | Electric melting furnace controller |
Non-Patent Citations (1)
| Title |
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| 宝钢超高功率直流电弧炉控制系统改造. 周建平，袁强，安景松，张巍.宝钢技术，第3期. 2004 * |
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