CN114171344B - Submerged arc furnace vacuum contactor and control method thereof - Google Patents
Submerged arc furnace vacuum contactor and control method thereof Download PDFInfo
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- CN114171344B CN114171344B CN202111535239.5A CN202111535239A CN114171344B CN 114171344 B CN114171344 B CN 114171344B CN 202111535239 A CN202111535239 A CN 202111535239A CN 114171344 B CN114171344 B CN 114171344B
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- 238000000034 method Methods 0.000 title claims description 8
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000003111 delayed effect Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
- H01H33/38—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Furnace Details (AREA)
Abstract
The vacuum contactor of the submerged arc furnace with the working current capable of being increased to more than 2000 amperes comprises a vacuum tube; a stationary contact; the moving contact is selectively attracted to and separated from the fixed contact through an electromagnet; and a control circuit including: the rectifier bridge is connected with an input power supply; the first branch is connected with two output ends of the rectifier bridge in parallel and comprises a first relay closing coil; the second branch is connected in parallel with the first branch and comprises a first diode, an auxiliary switch, a second relay closing wire package and a capacitor connected in parallel with the second relay closing wire package, wherein the first diode, the auxiliary switch and the second relay closing wire package are sequentially connected in series; the third branch is connected with the auxiliary switch and the second relay closing coil in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch connected with the electromagnetic coil unit in parallel, wherein the first switch, the electromagnetic coil unit and the fourth branch are sequentially connected in series; wherein the electromagnetic coil unit is arranged corresponding to the electromagnet.
Description
Technical Field
The invention relates to the field of vacuum contactors, in particular to a submerged arc furnace vacuum contactor and a control method thereof.
Background
With the maturity of the submerged arc furnace low pressure compensation technology, the submerged arc furnace low pressure compensation equipment is widely popularized, and the acceptance and affirmation of the domestic vast submerged arc furnace user units are obtained. The capacitor in the product is an important component of the submerged arc furnace low-voltage compensation equipment, and as the submerged arc furnace is large in size, the capacity of a single set of compensation equipment reaches more than 40-50 Mvar, and the low-voltage compensation device comprises a capacitor cabinet, a forced ventilation system and a refrigeration cooling system, so that the larger the equipment capacity is, the larger the occupied area is occupied. The low-voltage capacitance compensation belongs to a high-current operation system, so that the installed capacity in unit volume is improved, the compensation efficiency can be improved, the energy waste can be reduced, and the occupied area of equipment can be reduced.
The maximum capacity of the single low-voltage compensation capacitor of the existing submerged arc furnace is only 50-60 Kvar (300 v), and the applicant has already introduced the maximum aggregate capacitor with the single capacity exceeding 180Kvar in the industry to the market, and the rated current reaches more than 600A. With the improvement of capacitor capacity, the original 1600A vacuum contactor of the switching element of the capacitor loop can not well meet the requirements of new high-capacity capacitor products.
The current-carrying capacity of the existing vacuum contactor is improved by simply increasing the conductive component so as to achieve the safe operation of the working current of the vacuum contactor above 2000A, but a plurality of problems still exist.
A) The low-voltage compensation vacuum contactor generates impact current at the moment of the attraction of the moving contact and the fixed contact, and the impact current is 4-5 times of rated working current; when the rated operating current rises to 2000A, the vacuum tubes of all existing vacuum contactors are impacted to shake.
B) In the existing vacuum contactor, the electromagnetic coils are divided into two groups, one group is a starting coil, and the other group is a holding coil after suction. When the coil is started, a strong attraction force is generated by using the attraction coil, and when the attraction of the moving contact and the static contact is switched to the holding coil, the whole attraction switching time is completed within 200 ms. When the working current of the vacuum contactor rises to 2000A, the attraction of the moving contact and the static contact is kept unstable, and a bouncing phenomenon is generated.
C) When the existing vacuum contactor breaks a loop, the breaking speed is slow, an arc-pulling phenomenon can be generated in a vacuum tube at some time, and the service life of the vacuum contactor is influenced.
Accordingly, there is a need to develop a submerged arc furnace vacuum contactor and a control method thereof to solve one or more of the above-mentioned problems.
Disclosure of Invention
To solve at least one of the above technical problems, according to an aspect of the present invention, there is provided a submerged arc furnace vacuum contactor in which an operating current can be raised to 2000 amperes, comprising:
A vacuum tube;
A stationary contact;
the moving contact is selectively attracted to and separated from the fixed contact through an electromagnet; and
A control circuit, comprising: the rectifier bridge is connected with an input power supply; the first branch is connected with two output ends of the rectifier bridge in parallel and comprises a first relay closing coil; the second branch is connected in parallel with the first branch and comprises a first diode, an auxiliary switch, a second relay closing wire package and a capacitor connected in parallel with the second relay closing wire package, wherein the first diode, the auxiliary switch and the second relay closing wire package are sequentially connected in series; the third branch is connected with the auxiliary switch and the second relay closing coil in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch, wherein the first switch, the electromagnetic coil unit and the fourth branch are sequentially connected in series, and the fourth branch comprises a direct-current switching power supply, a second switch, a second diode and a first resistor which are sequentially connected in series;
The electromagnetic coil unit is arranged corresponding to the electromagnet, and when the auxiliary switch is disconnected to enable the second relay closing coil to be powered off, the capacitor is used for supplying power to the second relay closing coil in a delayed mode.
According to yet another aspect of the present invention, the input power source is an ac power source; preferably, the electromagnetic coil unit works when the first switch and the second switch are closed, the electromagnet attracts the moving contact, and the moving contact is engaged with the fixed contact.
According to still another aspect of the present invention, the dc switching power supply is a low-voltage switching power supply of 24V or less.
According to yet another aspect of the present invention, the first branch further includes a second resistor connected in series with the first relay closing coil.
According to another aspect of the invention, the submerged arc furnace vacuum contactor further comprises a third resistor connected in parallel with the two output ends of the rectifier bridge.
According to a further aspect of the invention, the solenoid unit is powered by said low voltage switching power supply during the hold phase.
According to still another aspect of the present invention, the first relay closing coil is a main coil of a low-current intermediate relay.
According to still another aspect of the present invention, the second relay closing coil is a main coil of a high-current intermediate relay.
According to still another aspect of the present invention, there is also provided a method of controlling the aforementioned submerged arc furnace vacuum contactor, characterized by comprising the steps of:
The rectifier bridge supplies power to the first relay closing coil and the second relay closing coil, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is powered on to attract the movable contact to be engaged with the static contact through the electromagnet, and the vacuum tube is conducted;
The auxiliary switch is disconnected, the second relay closing wire pack is powered off, the first switch is disconnected, the first relay closing wire pack is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switching power supply supplies power to the electromagnetic coil unit to keep the vacuum tube on;
And the input power supply is closed, the rectifier bridge stops supplying power to the first relay closing coil, the second switch is disconnected, the electromagnetic coil unit is deenergized, the electromagnet releases the movable contact, and the vacuum tube is disconnected.
According to another aspect of the invention, when the second relay closing coil loses power, the capacitor supplies power for the second relay closing coil in a delayed manner; preferably, the vacuum tube is rapidly disconnected by a back electromotive force generated from the electromagnetic coil unit when the electromagnetic coil unit is powered down.
The invention can obtain one or more of the following technical effects:
the working current of the submerged arc furnace vacuum contactor can be raised to more than 2000A;
the vibration of the vacuum tube caused by impact current when the vacuum contactor is started can be eliminated;
The suction time of the movable contact and the fixed contact of the vacuum contactor can be reduced, and the suction bouncing phenomenon is avoided;
the breaking speed of the vacuum contactor can be increased, and the arcing phenomenon in the vacuum tube can be reduced.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a control circuit of a submerged arc furnace vacuum contactor according to a preferred embodiment of the present invention.
Detailed Description
The present invention is described in its best mode by the following preferred embodiments with reference to the accompanying drawings, and the detailed description herein is to be construed as limiting the invention, since various changes and modifications can be made without departing from the spirit and scope of the invention.
Example 1
According to a preferred embodiment of the present invention, referring to fig. 1, there is provided a submerged arc furnace vacuum contactor in which an operating current can be raised to more than 2000 amperes, characterized by comprising:
A vacuum tube;
A stationary contact;
the moving contact is selectively attracted to and separated from the fixed contact through an electromagnet; and
A control circuit, comprising: the rectifier bridge D1 is connected with an input power supply; the first branch is connected with two output ends of the rectifier bridge D1 in parallel and comprises a first relay closing coil J1; the second branch is connected in parallel with the first branch and comprises a first diode D2, an auxiliary switch K, a second relay closing coil J2 and a capacitor C connected in parallel with the second relay closing coil J2, wherein the first diode D2, the auxiliary switch K and the second relay closing coil J2 are sequentially connected in series; the third branch is connected with the auxiliary switch K and the second relay closing coil J2 in parallel in series and comprises a first switch K2, an electromagnetic coil unit and a fourth branch connected with the electromagnetic coil unit in parallel in series in sequence, and the fourth branch comprises a direct current switching power supply CW, a second switch K1, a second diode D3 and a first resistor R4 connected with the second switch K1 in parallel in series in sequence;
the electromagnetic coil unit is arranged corresponding to the electromagnet, and when the auxiliary switch K is disconnected to enable the second relay closing coil J2 to be powered off, the capacitor C supplies power for the second relay closing coil J2 in a delayed mode.
Preferably, referring to fig. 1, the closing coils J1, J2 are powered by a rectifier bridge D1, the switches K1, K2 are attracted and turned on, and the electromagnetic coils L1, L2 work to turn on the vacuum tube (the movable contact is jointed with the stationary contact) through an electromagnet; and then the auxiliary switch K is disconnected, the closing coil J2 is deenergized, the switch K2 is disconnected, the closing coil J1 is kept powered, the switch K1 is kept on, and the electromagnetic coils L1 and L2 powered by the power supply CW are kept on. Finally, the closing coil J1 is powered off, the switch K1 is disconnected, and the vacuum tube is rapidly disconnected through counter electromotive force of the electromagnetic coils L1 and L2.
Preferably, when the vacuum contactor is closed and kept in place, the auxiliary switch K acts, the closing coil J2 is deenergized, the contact (switch K2) of the relay opening K2 is disconnected, and the vacuum contactor closing coils (electromagnetic coils L1 and L2) are kept in attraction by 24V.
Advantageously, the vacuum contactor eliminates vacuum tube chatter as the vacuum contactor draws in the surge. The phenomenon of unstable attraction and bouncing during the attraction of the vacuum contactor can be reduced; the operation power consumption of the whole vacuum contactor is lower, and the original 100W is reduced to 35W; the arcing phenomenon in the vacuum tube during breaking of the vacuum contactor can be reduced; the reliability and the service life of the product can be improved.
Preferably, the electromagnetic coil unit is composed of a first electromagnetic coil L1 and a second electromagnetic coil L2.
According to a further preferred embodiment of the invention, the input power source is an ac power source.
According to another preferred embodiment of the present invention, the dc switching power supply is a low-voltage switching power supply of 24V or less.
According to a further preferred embodiment of the invention, the first branch further comprises a second resistor R3 connected in series with the first relay closing coil J1.
According to another preferred embodiment of the present invention, the submerged arc furnace vacuum contactor further comprises a third resistor R2 connected in parallel to the two output terminals of the rectifier bridge D1.
According to a further preferred embodiment of the invention, the electromagnet is a direct current double coil electromagnet. Preferably, the solenoid unit is powered by said low voltage switching power supply during the hold phase.
According to a further preferred embodiment of the present invention, the first relay closing coil J1 is a main coil of a low-current intermediate relay.
According to a further preferred embodiment of the present invention, the second relay closing coil J2 is a main coil of a high-current intermediate relay.
According to still another preferred embodiment of the present invention, there is also provided a method of controlling the aforementioned submerged arc furnace vacuum contactor, characterized by comprising the steps of:
The rectifier bridge supplies power to the first relay closing coil and the second relay closing coil, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is powered on to attract the movable contact to be engaged with the static contact through the electromagnet, and the vacuum tube is conducted;
The auxiliary switch is disconnected, the second relay closing wire pack is powered off, the first switch is disconnected, the first relay closing wire pack is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switching power supply supplies power to the electromagnetic coil unit to keep the vacuum tube on;
And the input power supply is closed, the rectifier bridge stops supplying power to the first relay closing coil, the second switch is disconnected, the electromagnetic coil unit is deenergized, the electromagnet releases the movable contact, and the vacuum tube is disconnected.
According to another preferred embodiment of the invention, the capacitor is used for supplying power to the second relay closing coil in a time delay manner when the second relay closing coil loses power; preferably, the vacuum tube is rapidly disconnected by a back electromotive force generated from the electromagnetic coil unit when the electromagnetic coil unit is powered down.
It can be understood that the existing direct current electromagnet with a single coil structure has a magnetic circuit formed by air, has larger magnetic resistance and larger holding current after attraction.
In contrast, after the direct-current double-coil electromagnet structure is adopted, the magnetic circuit forms a closed ferromagnetic loop, and the attractive force is doubled. The attraction force of the original single-coil direct current electromagnet is more than or equal to 120N, the safe operation of the vacuum tube cannot be ensured, the existing double-coil direct current electromagnet is more than or equal to 320N, the separation and combination operation of the vacuum tube is ensured, and the contact resistance is less than or equal to 40 mu omega. Advantageously, by increasing the actuation power to the electromagnetic actuation circuit, the vacuum tube contacts do not shake and damage the vacuum tube in the case of a 4 times rated high current.
Furthermore, the existing single-coil electromagnet power supply is fixed current (500 mA), namely the attraction current is the same as the holding current, and the coil power consumption is larger.
Compared with the prior art, after the double-coil structure is adopted, the voltage reaches more than or equal to 120V instantly during suction, the iron jaw is quickly sucked, and then the iron jaw is converted into low voltage for 24V maintenance, so that the operation power consumption is greatly reduced. The low-voltage direct-current switch power supply is used for replacing the original electromagnetic mechanism to keep the power supply, so that the energy is saved, the contact pressure of the vacuum tube is kept unchanged, and the operation is safer.
Preferably, the switching-on trigger signal firstly attracts the high-current intermediate relay (60A), gives 4-5 times of rated current to attract for 1-2 s instantly, and then gives a small current (100 mA) to enable the magnet to enter a holding state, so that the switching-on time is greatly reduced, and the switching-on time is already less than 50 ms.
Advantageously, by connecting the capacitor C in parallel, the suction time of the electromagnetic mechanism can be prolonged, the bouncing of the vacuum tube can be reduced, and the switching time can be safely passed.
Advantageously, a highly reliable miniature relay (small current intermediate relay) is adopted, and by adopting the principle that voltages with polarity opposite to that of the original voltages can be generated at the closing moment of the electromagnetic coils L1 and L2 through innovative design, the residual magnetism of the electromagnet can be rapidly eliminated by the voltages with polarity opposite to the original voltages, so that the split setting time of the electromagnetic mechanism is improved, the spark pulling caused by slow switching of a vacuum tube is reduced, and the reliability of the contactor is greatly improved.
Preferably, when the brake is opened, the small-current intermediate relay (5A) acts to give out reverse current, and the iron jaw is pushed away instantly by the reaction force of the electromagnetic, so that the brake opening is accelerated, the brake opening time is shortened, and the brake opening time is already up to below 40 ms.
Preferably, the control circuit works as follows:
In the pull-in stage, a 220V alternating current input power supply is changed into direct current through a rectifier bridge D1, R2 is a protection piezoresistor, a large-current intermediate relay main wire package J2 is powered on to pull-in switch K2, a small-current intermediate relay main wire package J1 is powered on to pull-in switch K1, an electromagnet is started to conduct a vacuum tube through a first coil L1 and a second coil L2, an auxiliary switch K acts to disconnect the voltage of the large-current intermediate relay main wire package J2 (a closing wire package), a capacitor C at two ends of the closing wire package J2 starts to discharge, the large-current intermediate relay contact is delayed to be disconnected for a certain time, the switch K2 is disconnected, and the delay time is determined by the capacity of the capacitor.
In the holding stage, the direct current switching power supply CW supplies power, after the switch K2 is opened, the second switch K1 is kept closed, the voltage of 24v output by the direct current switching power supply CW is added to the first coil L1 and the second coil L2 through the diode D3, and when the voltage of the first coil L1 and the second coil L2 is lower than 24v, the 24V output of the direct current switching power supply CW is automatically connected to keep the closing and the conduction of the vacuum tube.
The invention can obtain one or more of the following technical effects:
the working current of the submerged arc furnace vacuum contactor can be raised to more than 2000A;
the vibration of the vacuum tube caused by impact current when the vacuum contactor is started can be eliminated;
The suction time of the movable contact and the fixed contact of the vacuum contactor can be reduced, and the suction bouncing phenomenon is avoided;
the breaking speed of the vacuum contactor can be increased, and the arcing phenomenon in the vacuum tube can be reduced.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a submerged arc furnace vacuum contactor that operating current can rise to 2000 amperes, characterized by includes:
A vacuum tube;
A stationary contact;
the moving contact is selectively attracted to and separated from the fixed contact through an electromagnet; and
A control circuit, comprising: the rectifier bridge is connected with an input power supply; the first branch is connected with two output ends of the rectifier bridge in parallel and comprises a first relay closing coil; the second branch is connected in parallel with the first branch and comprises a first diode, an auxiliary switch, a second relay closing wire package and a capacitor connected in parallel with the second relay closing wire package, wherein the first diode, the auxiliary switch and the second relay closing wire package are sequentially connected in series; the third branch is connected with the auxiliary switch and the second relay closing coil in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch, wherein the first switch, the electromagnetic coil unit and the fourth branch are sequentially connected in series, and the fourth branch comprises a direct-current switching power supply, a second switch, a second diode and a first resistor which are sequentially connected in series;
the electromagnetic coil unit is arranged corresponding to the electromagnet, and when the auxiliary switch is disconnected to enable the second relay closing coil to be powered off, the capacitor is used for supplying power to the second relay closing coil in a delayed mode;
The electromagnetic coil unit consists of a first electromagnetic coil and a second electromagnetic coil, and the voltage reaches 120V or more instantly when the electromagnetic coil unit is in a double-coil structure and is attracted.
2. The submerged arc furnace vacuum contactor of claim 1, wherein the input power source is an ac power source; when the first switch and the second switch are closed, the electromagnetic coil unit works, the electromagnet attracts the moving contact, and the moving contact is jointed with the fixed contact.
3. The submerged arc furnace vacuum contactor of claim 2, wherein the dc switching power supply is a low voltage switching power supply of 24V or less.
4. The submerged arc furnace vacuum contactor of claim 3, wherein the first branch further comprises a second resistor in series with the first relay closing coil.
5. The submerged arc furnace vacuum contactor of any one of claims 1-4, further comprising a third resistor connected in parallel with the two outputs of the rectifier bridge.
6. The submerged arc furnace vacuum contactor of claim 4, wherein the solenoid unit is powered by the low voltage switching power supply during the hold phase.
7. The submerged arc furnace vacuum contactor of claim 5, wherein the first relay closing coil is a main coil of a low current intermediate relay.
8. The submerged arc furnace vacuum contactor of claim 7, wherein the second relay closing coil is a main coil of a high current intermediate relay.
9. A method of controlling the submerged arc furnace vacuum contactor of any one of claims 1-8, characterized by the steps of:
The rectifier bridge supplies power to the first relay closing coil and the second relay closing coil, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is powered on to attract the movable contact to be engaged with the static contact through the electromagnet, and the vacuum tube is conducted;
The auxiliary switch is disconnected, the second relay closing wire pack is powered off, the first switch is disconnected, the first relay closing wire pack is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switching power supply supplies power to the electromagnetic coil unit to keep the vacuum tube on;
And the input power supply is closed, the rectifier bridge stops supplying power to the first relay closing coil, the second switch is disconnected, the electromagnetic coil unit is deenergized, the electromagnet releases the movable contact, and the vacuum tube is disconnected.
10. The method of claim 9, wherein the capacitor delays power to the second relay closing coil when the second relay closing coil is de-energized; when the electromagnetic coil unit is powered off, the vacuum tube is rapidly disconnected through counter electromotive force generated by the electromagnetic coil unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535239.5A CN114171344B (en) | 2021-12-15 | 2021-12-15 | Submerged arc furnace vacuum contactor and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535239.5A CN114171344B (en) | 2021-12-15 | 2021-12-15 | Submerged arc furnace vacuum contactor and control method thereof |
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| CN114171344A CN114171344A (en) | 2022-03-11 |
| CN114171344B true CN114171344B (en) | 2024-08-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN216353938U (en) * | 2021-12-15 | 2022-04-19 | 无锡北科自动化科技有限公司 | Vacuum contactor of submerged arc furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1487826A (en) * | 1973-11-23 | 1977-10-05 | Sevcon Ltd | Contactor interlock circuits |
| JP2003281958A (en) * | 2002-03-25 | 2003-10-03 | Fuji Electric Co Ltd | Power source circuit of rapid breaking coil for line breaker |
| CN101320655A (en) * | 2008-07-11 | 2008-12-10 | 洛阳源创电气有限公司 | Electronic type electromagnetic control apparatus of high voltage vacuum contactor |
| CN201345312Y (en) * | 2008-08-07 | 2009-11-11 | 叶金来 | Material-saving vacuum contactor with high breaking capacity |
| RU89781U1 (en) * | 2009-08-10 | 2009-12-10 | Леонид Абрамович Герман | INSTALLATION OF TRANSVERSE CAPACITY COMPENSATION IN THE AC TRACING NETWORK |
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| CN216353938U (en) * | 2021-12-15 | 2022-04-19 | 无锡北科自动化科技有限公司 | Vacuum contactor of submerged arc furnace |
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