CN114171344A - 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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- CN114171344A CN114171344A CN202111535239.5A CN202111535239A CN114171344A CN 114171344 A CN114171344 A CN 114171344A CN 202111535239 A CN202111535239 A CN 202111535239A CN 114171344 A CN114171344 A CN 114171344A
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- 238000000034 method Methods 0.000 title claims description 8
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 230000003068 static effect Effects 0.000 claims abstract description 6
- 230000003111 delayed effect Effects 0.000 claims description 7
- 230000002829 reductive effect Effects 0.000 description 13
- 238000010891 electric arc Methods 0.000 description 4
- 230000005291 magnetic effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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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Abstract
The vacuum contactor of the submerged arc furnace with the working current capable of being increased to more than 2000 amperes is provided, and comprises a vacuum tube; static contact; the moving contact is selectively attracted with the fixed contact and disconnected through the electromagnet; and a control circuit comprising: the rectifier bridge is connected with an input power supply; the first branch circuit is connected with the two output ends of the rectifier bridge in parallel and comprises a first relay closing solenoid; the second branch circuit is connected with the first branch circuit in parallel and comprises a first diode, an auxiliary switch, a second relay closing solenoid and a capacitor, wherein the first diode, the auxiliary switch and the second relay closing solenoid are sequentially connected in series, and the capacitor is connected with the second relay closing solenoid in parallel; the third branch circuit is connected with the auxiliary switch and the second relay closing solenoid in series in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch circuit, wherein the first switch, the electromagnetic coil unit and the fourth branch circuit 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 low-pressure compensation technology of the submerged arc furnace, the low-pressure compensation equipment of the submerged arc furnace is widely popularized and accepted and determined by the majority of submerged arc furnace user units in China. The capacitor in the product is an important component of the submerged arc furnace low-voltage compensation equipment, the submerged arc furnace is large-sized, the capacity of the single compensation equipment reaches more than 40-50 Mvar, the low-voltage capacitance compensation device comprises a capacitance cabinet, a forced ventilation system and a refrigeration cooling system, and the larger the equipment capacity is, the larger the occupied space is, and the larger the occupied space is. 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 is reduced, and the occupied area of equipment can be reduced.
The maximum capacity of a single low-voltage compensation capacitor of the existing submerged arc furnace is only 50-60 Kvar (300v), and the applicant has already provided the largest integrated capacitor with the capacity exceeding 180Kvar in the industry to the market, and the rated current reaches more than 600A. With the increase of the 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 existing vacuum contactor simply increases the current-carrying capacity of a conductive part to achieve the purpose that the working current of the existing vacuum contactor safely operates above 2000A, but still has a plurality of problems.
a) The low-voltage compensation vacuum contactor can generate impact current at the moment of attracting the moving contact and the fixed contact, and the impact current is 4-5 times of rated working current; when the rated working current is increased to 2000A, the vacuum tubes of all the existing vacuum contactors are impacted to generate vibration.
b) In the existing vacuum contactor, electromagnetic coils are divided into two groups, one group is a starting coil, and the other group is a holding coil after attraction. When the starting is carried out, the attracting coil is used for generating strong attracting force, when the moving contact and the fixed contact attract and switch into the maintaining coil, the whole attracting switching time is finished within 200 ms. When the working current of the vacuum contactor rises to 2000A, the attraction of the moving contact and the fixed contact is kept unstable, and the bounce phenomenon is generated.
c) When the existing vacuum contactor breaks a loop, the breaking speed is slow, and sometimes an arc discharge phenomenon is generated in a vacuum tube, so that the service life of the vacuum contactor is influenced.
Therefore, 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 technical problems.
Disclosure of Invention
In order 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 having an operating current that can be increased to 2000 amps or more, comprising:
a vacuum tube;
static contact;
the moving contact is selectively attracted with the fixed contact and disconnected through the electromagnet; and
a control circuit, comprising: the rectifier bridge is connected with an input power supply; the first branch circuit is connected with the two output ends of the rectifier bridge in parallel and comprises a first relay closing solenoid; the second branch circuit is connected with the first branch circuit in parallel and comprises a first diode, an auxiliary switch, a second relay closing solenoid and a capacitor, wherein the first diode, the auxiliary switch and the second relay closing solenoid are sequentially connected in series, and the capacitor is connected with the second relay closing solenoid in parallel; the third branch circuit is connected with the auxiliary switch and the second relay closing solenoid in series in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch circuit, wherein the first switch, the electromagnetic coil unit and the fourth branch circuit are sequentially connected in series, the fourth branch circuit is connected with the electromagnetic coil unit in parallel, and the fourth branch circuit comprises a direct-current switching power supply, a second switch, a second diode and a first resistor, wherein the direct-current switching power supply, the second switch and the second diode are sequentially connected in series, and the first resistor is connected with the second switch in parallel;
the electromagnetic coil unit and the electromagnet are arranged correspondingly, and when the auxiliary switch is switched off to enable the second relay closing coil to be powered off, the capacitor supplies power to the second relay closing coil in a delayed mode.
According to yet another aspect of the invention, the input power source is an alternating current power source; preferably, 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 connected with the fixed contact.
According to another aspect of the invention, the dc switching power supply is a low voltage switching power supply of 24V or less.
According to a further aspect of the invention, the first branch further comprises 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 coil unit is powered by said low voltage switching power supply during the hold phase.
According to another aspect of the present invention, the first relay closing coil is a main coil of a low current intermediate relay.
According to another aspect of the present invention, the second relay closing coil is a main coil of a high current intermediate relay.
According to another aspect of the present invention, there is also provided a method for controlling the vacuum contactor of the submerged arc furnace, which is characterized by comprising the following steps:
the rectifier bridge supplies power to a first relay closing solenoid and a second relay closing solenoid, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is electrified to work, attracts the movable contact to be jointed with the fixed contact through the electromagnet, and conducts the vacuum tube;
the auxiliary switch is switched off, the second relay closing coil loses power, the first switch is switched off, the first relay closing coil is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switch power supply supplies power to the electromagnetic coil unit to keep the vacuum tube conducted;
and (3) turning off the input power supply, stopping supplying power to the first relay closing solenoid by the rectifier bridge, disconnecting the second switch, powering off the electromagnetic coil unit, loosening the movable contact by the electromagnet and disconnecting the vacuum tube.
According to another aspect of the invention, when the second relay closing coil loses power, the capacitor supplies power to the second relay closing coil in a delayed mode; preferably, the vacuum tube is quickly disconnected by the back electromotive force generated by the solenoid unit when the solenoid unit is de-energized.
The invention can obtain one or more of the following technical effects:
the working current of the submerged arc furnace vacuum contactor can be increased to more than 2000A;
the shaking vibration of the vacuum tube caused by impact current when the vacuum contactor is started can be eliminated;
the actuation time of the moving contact and the static contact of the vacuum contactor can be reduced, and the actuation bounce phenomenon is avoided;
the breaking speed of the vacuum contactor can be accelerated, and the arc discharge phenomenon in the vacuum pipe can be reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of a control circuit of a submerged arc furnace vacuum contactor according to a preferred embodiment of the invention.
Detailed Description
The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings, wherein the detailed description is for the purpose of illustrating the invention in detail, and is not to be construed as limiting the invention, as various changes and modifications can be made therein without departing from the spirit and scope thereof, which are intended to be encompassed within the appended claims.
Example 1
According to a preferred embodiment of the present invention, referring to fig. 1, there is provided a submerged arc furnace vacuum contactor with an operating current capable of rising to more than 2000a, comprising:
a vacuum tube;
static contact;
the moving contact is selectively attracted with the fixed contact and disconnected through the electromagnet; and
a control circuit, comprising: the rectifier bridge D1 is connected with the input power supply; a first branch connected in parallel with two output terminals of the rectifier bridge D1 and including a first relay closing coil J1; the second branch circuit is connected with the first branch circuit in parallel and comprises a first diode D2, an auxiliary switch K, a second relay closing coil J2 and a capacitor C connected with the second relay closing coil J2 in parallel, 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 series in parallel and comprises a first switch K2, an electromagnetic coil unit and a fourth branch, the first switch K2, the electromagnetic coil unit and the fourth branch are sequentially connected in series, the fourth branch comprises a direct-current switching power supply CW, a second switch K1, a second diode D3 and a first resistor R4, the direct-current switching power supply CW, the second switch K1 and the second diode D3 are sequentially connected in series, and the first resistor R4 is connected with the second switch K1 in parallel;
the electromagnetic coil unit and the electromagnet are arranged correspondingly, and when the auxiliary switch K is switched off to enable the second relay closing coil J2 to be powered off, the capacitor C supplies power to the second relay closing coil J2 in a delayed mode.
Preferably, referring to fig. 1, the closing coils J1 and J2 are powered by a rectifier bridge D1, the switches K1 and K2 are switched on in an attracting mode, and the electromagnetic coils L1 and L2 work to switch on the vacuum tube through the electromagnet (the movable contact is jointed with the fixed contact); then the auxiliary switch K is switched off, the closing coil J2 loses power, the switch K2 is switched off, the closing coil J1 keeps supplying power, the switch K1 keeps conducting, and the power supply CW supplies power to the electromagnetic coils L1 and L2 to keep the vacuum tube conducting. Finally, the closing solenoid J1 is powered off, the switch K1 is disconnected, and the vacuum tube is quickly disconnected through the back electromotive force of the electromagnetic coils L1 and L2.
Preferably, when the vacuum contactor is switched on and kept in place, the auxiliary switch K is operated, the switching-on coil J2 loses power, the contact of the relay switching-off K2 (the switch K2) is disconnected, and the switching-on coils (the electromagnetic coils L1 and L2) of the vacuum contactor are kept switched on by 24V.
Advantageously, the vacuum contactor can eliminate the phenomenon of shaking of the vacuum pipe when the vacuum contactor pulls in inrush current. The phenomenon of unstable suction and bounce can be reduced when the vacuum contactor is sucked; the power consumption of the whole vacuum contactor is lower, and is reduced to 35W from the original 100W; the arc discharge phenomenon in the vacuum tube when the vacuum contactor is disconnected 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 yet another preferred embodiment of the present invention, the input power source is an alternating current 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 two output terminals of the rectifier bridge D1.
According to a further preferred embodiment of the invention, the electromagnet is a dc dual coil electromagnet. Preferably, the solenoid coil unit is powered by said low voltage switching power supply during the hold phase.
According to another preferred embodiment of the present invention, the first relay closing coil J1 is a main coil of a low current intermediate relay.
According to another preferred embodiment of the present invention, the second relay closing coil J2 is a main coil of a high current intermediate relay.
According to another preferred embodiment of the present invention, there is also provided a method of controlling the foregoing submerged arc furnace vacuum contactor, characterized by comprising the steps of:
the rectifier bridge supplies power to a first relay closing solenoid and a second relay closing solenoid, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is electrified to work, attracts the movable contact to be jointed with the fixed contact through the electromagnet, and conducts the vacuum tube;
the auxiliary switch is switched off, the second relay closing coil loses power, the first switch is switched off, the first relay closing coil is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switch power supply supplies power to the electromagnetic coil unit to keep the vacuum tube conducted;
and (3) turning off the input power supply, stopping supplying power to the first relay closing solenoid by the rectifier bridge, disconnecting the second switch, powering off the electromagnetic coil unit, loosening the movable contact by the electromagnet and disconnecting the vacuum tube.
According to another preferred embodiment of the present invention, when the second relay closing coil loses power, the capacitor provides power to the second relay closing coil in a delayed manner; preferably, the vacuum tube is quickly disconnected by the back electromotive force generated by the solenoid unit when the solenoid unit is de-energized.
It can be understood that in the existing direct current electromagnet with the single coil structure, a magnetic circuit forms a loop by air, the magnetic resistance is large, and the holding current is large after attraction.
In contrast, after the direct-current double-coil electromagnet structure is adopted, a closed ferromagnetic loop is formed in a magnetic circuit, and attraction 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 current double-coil structure direct current electromagnet is more than or equal to 320N, the on-off operation of the vacuum tube is ensured, and the contact resistance is less than or equal to 40 mu omega. Advantageously, by increasing the attracting power of the electromagnetic attracting circuit, the vacuum tube contact does not shake and damage the vacuum tube under the condition that the electromagnetic attracting circuit passes 4 times of rated large current.
Further, the existing power supply of the single-coil electromagnet has fixed current (500mA), namely, pull-in current is the same as holding current, and the power consumption of the coil is larger.
In contrast, after the double-coil structure is adopted, the voltage instantly reaches more than or equal to 120V during attracting, the ferroceptha is attracted quickly and then is converted into low voltage 24V for keeping, and the operation power consumption is greatly reduced. Advantageously, the low-voltage direct-current switching power supply is adopted to replace the original electromagnetic mechanism to keep the power supply, so that the energy is saved, the pressure of the contact of the vacuum tube is kept unchanged, and the operation is safer.
Preferably, the closing contact signal firstly attracts a large-current intermediate relay (60A), gives a rated current which is 4-5 times of the rated current and attracts for 1-2 s instantly, and then gives a small current (100mA) to enable the magnet to enter a holding state, so that the closing time is greatly reduced and reaches below 50 ms.
Advantageously, the capacitor C is connected in parallel, so that the attraction time of the electromagnetic mechanism can be prolonged, the bounce of the vacuum tube is reduced, and the switching time is safely passed.
Advantageously, a high-reliability small relay (low-current intermediate relay) is adopted, and the principle that the electromagnetic coils L1 and L2 can generate voltage with the polarity opposite to that of the original voltage at the moment of closing is utilized through innovative design, and the voltage with the opposite polarity can quickly eliminate the residual magnetism of the electromagnet, so that the delay time of an electromagnetic mechanism is prolonged, the spark generated 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 reverse current, and the iron jaw is pushed away instantly by the reaction force of electromagnetism, so that the brake opening is accelerated, the brake opening time is shortened, and the brake opening time is less than 40 ms.
Preferably, the control circuit works as follows:
in the attracting stage, a 220V alternating-current input power supply is changed into direct current through a rectifier bridge D1, R2 is a protective piezoresistor, a large-current intermediate relay main line package J2 is powered on a attracting switch K2, a small-current intermediate relay main line package J1 is powered on a attracting switch K1, an electromagnet is started through a first coil L1 and a second coil L2 to conduct a vacuum tube, an auxiliary switch K acts to break the voltage of the large-current intermediate relay main line package J2 (a closing line package), a capacitor C at two ends of the line package J2 starts to discharge, the closing of a switch of the large-current intermediate relay contact is delayed for a certain time, the switch K2 is disconnected, and the delay time is determined by the capacity of the capacitor.
And in the maintaining stage, the power is supplied by a direct current switching power supply CW instead, after a switch K2 is switched off, a second switch K1 is kept closed, 24v voltage output by the direct current switching power supply CW is added to a first coil L1 and a second coil L2 through a diode D3, and when the voltage of the first coil L1 and the voltage of the second coil L2 are lower than 24v, the 24V output of the direct current switching power supply CW is automatically connected to keep the vacuum tube closed and conducted.
The invention can obtain one or more of the following technical effects:
the working current of the submerged arc furnace vacuum contactor can be increased to more than 2000A;
the shaking vibration of the vacuum tube caused by impact current when the vacuum contactor is started can be eliminated;
the actuation time of the moving contact and the static contact of the vacuum contactor can be reduced, and the actuation bounce phenomenon is avoided;
the breaking speed of the vacuum contactor can be accelerated, and the arc discharge phenomenon in the vacuum pipe 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, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A submerged arc furnace vacuum contactor with working current capable of being increased to more than 2000 amperes is characterized by comprising:
a vacuum tube;
static contact;
the moving contact is selectively attracted with the fixed contact and disconnected through the electromagnet; and
a control circuit, comprising: the rectifier bridge is connected with an input power supply; the first branch circuit is connected with the two output ends of the rectifier bridge in parallel and comprises a first relay closing solenoid; the second branch circuit is connected with the first branch circuit in parallel and comprises a first diode, an auxiliary switch, a second relay closing solenoid and a capacitor, wherein the first diode, the auxiliary switch and the second relay closing solenoid are sequentially connected in series, and the capacitor is connected with the second relay closing solenoid in parallel; the third branch circuit is connected with the auxiliary switch and the second relay closing solenoid in series in parallel and comprises a first switch, an electromagnetic coil unit and a fourth branch circuit, wherein the first switch, the electromagnetic coil unit and the fourth branch circuit are sequentially connected in series, the fourth branch circuit is connected with the electromagnetic coil unit in parallel, and the fourth branch circuit comprises a direct-current switching power supply, a second switch, a second diode and a first resistor, wherein the direct-current switching power supply, the second switch and the second diode are sequentially connected in series, and the first resistor is connected with the second switch in parallel;
the electromagnetic coil unit and the electromagnet are arranged correspondingly, and when the auxiliary switch is switched off to enable the second relay closing coil to be powered off, the capacitor supplies power to the second relay closing coil in a delayed mode.
2. The submerged arc furnace vacuum contactor according to claim 1, characterized in that the input power source is an alternating current power source; preferably, 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 connected with the fixed contact.
3. The submerged arc furnace vacuum contactor according to claim 2, characterized in that the dc switching power supply is a low voltage switching power supply of 24V or less.
4. The submerged arc furnace vacuum contactor as claimed in claim 3, characterized in that the first branch further comprises a second resistor connected in series with the first relay closing coil.
5. The submerged arc furnace vacuum contactor as claimed in any of the claims 1-4, characterized by a third resistor connected in parallel to two output terminals of the rectifier bridge.
6. The submerged arc furnace vacuum contactor according to claim 4, characterized in that the solenoid unit is powered by the low-voltage switching power supply during the hold phase.
7. The submerged arc furnace vacuum contactor according to claim 5, characterized in that the first relay closing coil is a main coil of a low current intermediate relay.
8. The submerged arc furnace vacuum contactor according to claim 7, characterized in that 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 according to any of the claims 1-8, characterized by the steps of:
the rectifier bridge supplies power to a first relay closing solenoid and a second relay closing solenoid, and the first switch and the second switch are attracted and conducted;
the electromagnetic coil unit is electrified to work, attracts the movable contact to be jointed with the fixed contact through the electromagnet, and conducts the vacuum tube;
the auxiliary switch is switched off, the second relay closing coil loses power, the first switch is switched off, the first relay closing coil is continuously powered by the rectifier bridge, and the second switch is kept on;
the direct current switch power supply supplies power to the electromagnetic coil unit to keep the vacuum tube conducted;
and (3) turning off the input power supply, stopping supplying power to the first relay closing solenoid by the rectifier bridge, disconnecting the second switch, powering off the electromagnetic coil unit, loosening the movable contact by the electromagnet and disconnecting the vacuum tube.
10. The method of claim 9, wherein the capacitor provides a delayed supply of power to the second relay closing coil when the second relay closing coil is de-energized; preferably, the vacuum tube is quickly disconnected by the back electromotive force generated by the solenoid unit when the solenoid unit is de-energized.
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| CN202111535239.5A CN114171344B (en) | 2021-12-15 | 2021-12-15 | Submerged arc furnace vacuum contactor and control method thereof |
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| CN202111535239.5A CN114171344B (en) | 2021-12-15 | 2021-12-15 | Submerged arc furnace vacuum contactor and control method thereof |
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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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2021
- 2021-12-15 CN CN202111535239.5A patent/CN114171344B/en active Active
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| US3963967A (en) * | 1973-11-23 | 1976-06-15 | Sevcon Engineering Limited | 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 |
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| CN114171344B (en) | 2024-08-13 |
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