CN114203485A - Control circuit and control method for submerged arc furnace vacuum contactor - Google Patents
Control circuit and control method for submerged arc furnace vacuum contactor Download PDFInfo
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- CN114203485A CN114203485A CN202111535255.4A CN202111535255A CN114203485A CN 114203485 A CN114203485 A CN 114203485A CN 202111535255 A CN202111535255 A CN 202111535255A CN 114203485 A CN114203485 A CN 114203485A
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- 238000000034 method Methods 0.000 title claims description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 4
- 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
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000306 component Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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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 utility model provides a hot stove vacuum contactor control circuit in ore deposit is provided, includes: 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 is powered by the input power supply in the pull-in stage, and is powered by the low-voltage switch power supply in the holding stage.
Description
Technical Field
The invention relates to the field of vacuum contactors, in particular to a control circuit and a control method for a vacuum contactor of a submerged arc furnace.
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 ventilation system and a 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 60Kvar (300v), the applicant has already provided the largest single integrated capacitor with the capacity exceeding 180Kvar in the industry to the market, the rated current reaches more than 600A, and the single capacitor switching loop reaches more than 1800A. With the increase of the capacitor capacity, the simple increase of the conductive parts of the switching element 1600A vacuum contactor of the original capacitor circuit cannot well meet the requirements of new high-capacity capacitor products, so that it is necessary to develop a new large-current (above 2000A) capacitor switching vacuum contactor. The control circuit of the vacuum contactor belongs to a core component, and the performance of the control circuit determines the performance of the vacuum contactor, so that the control circuit of the vacuum contactor needs to be manufactured firstly when the vacuum contactor is manufactured to be more than 2000A.
The existing control circuit adopts a rectification circuit to rectify AC220V of a working power supply of the vacuum contactor into DC110V, an electromagnetic coil is electrified to be connected with a high-power starting coil of the electromagnetic coil, the coil generates strong suction force, the iron jaw is attracted by overcoming the spring force so as to push an auxiliary switch, and a contact of the auxiliary switch switches a starting coil loop of the electromagnetic coil into a holding coil with low power consumption. The whole loop control process comprises electrifying, coil generating suction force, jaw action, auxiliary switch action and switching and maintaining suction force; the actual time from power-on to completion of the operation flow is 100-200 ms. When the vacuum contactor needs to break the main loop, the working power supply is disconnected, the attraction force of the electromagnetic coil disappears, the elastic force of the spring pushes the iron jaw away, and the main electrode in the vacuum bulb is disconnected. The existing control circuit has the following disadvantages:
a) when the circuit is electrified and the action process of the vacuum contactor is finished, although the suction force of the electromagnetic coil pushes the completion of the connection of the main loop, the connection time is short, the electromagnetic coil is switched to a low-suction force coil loop with low power consumption immediately, and the high-power working time of the electromagnetic coil is too short and is less than 200 Ms. When the current of the main loop is increased to 2000A, the conductive part is increased in weight, the phenomenon of shaking caused by impact received when the conductive electrode of the vacuum tube is fit cannot be well suppressed due to the large attraction force in a short time, and the phenomenon of bounce caused by the fact that the vacuum contactor cannot be maintained after first attraction, the ferrocephalum is attracted again after falling off, and even the attraction is carried out for many times is easily caused.
b) When the existing vacuum contactor breaks a loop, a control circuit is powered off, but the attraction force on an electromagnetic coil cannot be consumed quickly, the breaking speed of the breaking time of a moving contact and a fixed contact in a vacuum bulb 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.
c) In the existing control circuit of the vacuum contactor, after the actuation of the main contact is finished, the rectifying circuit still works to provide a low-power-consumption power supply for the coil, and at the moment, the power consumption of the rectifying circuit is still relatively high and is 100W.
Therefore, there is a need to develop a control circuit and a control method for a submerged arc furnace vacuum contactor 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 vacuum contactor control circuit for a submerged arc furnace, 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 is powered by the input power supply in the pull-in stage, and is powered by the low-voltage switch power supply in the holding stage.
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 control circuit further comprises a third resistor connected in parallel with the two output ends of the rectifier bridge.
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 the other aspect of the invention, 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 another aspect of the present invention, there is also provided a method for controlling a submerged arc furnace vacuum contactor by the aforementioned control circuit, 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 a movable contact to be connected with a fixed contact through an electromagnet, and conducts the vacuum tube, and the electromagnetic coil unit consists of a first electromagnetic coil and a second electromagnetic coil;
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 yet another aspect of the present invention, the vacuum tube is rapidly disconnected by a back electromotive force generated from the solenoid unit when the solenoid unit is de-energized.
The invention can obtain one or more of the following technical effects:
the vacuum tube shaking phenomenon during the suction inrush current of the vacuum contactor can be eliminated;
the phenomenon of unstable suction and bounce can be reduced when the vacuum contactor is sucked;
the power consumption of the whole vacuum contactor can be reduced, for example, the original 100W is reduced to 35W;
the arc discharge phenomenon in the vacuum tube when the vacuum contactor is disconnected 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 submerged arc furnace vacuum contactor control circuit 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 vacuum contactor control circuit for a submerged arc furnace, 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 is powered by the input power supply in the pull-in stage, and is powered by the low-voltage switching power supply CW in the holding stage.
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 control circuit can eliminate the shaking vibration of the vacuum tube caused by the impact current when the vacuum contactor is started; 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.
According to yet another preferred embodiment of the present 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 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 control circuit further comprises a third resistor R2 connected in parallel to two output terminals of the rectifier bridge D1.
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, when the auxiliary switch is turned off to disconnect the second relay closing coil, the capacitor delays power supply to the second relay closing coil.
According to another preferred embodiment of the present invention, there is also provided a method for controlling a submerged arc furnace vacuum contactor by the aforementioned control circuit, which is 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 a movable contact to be connected with a fixed contact through an electromagnet, and conducts the vacuum tube, and the electromagnetic coil unit consists of a first electromagnetic coil and a second electromagnetic coil;
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 a further preferred embodiment of the invention, the vacuum tube is quickly disconnected by back emf 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, by using the principle that a high-reliability small relay (low-current intermediate relay) can generate a voltage with the polarity opposite to that of the original voltage at the moment of closing the electromagnetic coils L1 and L2, the residual magnetism of the electromagnet can be quickly eliminated by the voltage with the opposite polarity, so that the delay time of an electromagnetic mechanism is prolonged, the sparks of the vacuum tube caused by slow brake opening are 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.
Preferably, the main loop starting pull-in time is reduced from 120ms to 55 ms. The switching-off time is reduced to 75ms from the original 110 ms. The operation power consumption is reduced to about 35W from the original 100W.
The invention can obtain one or more of the following technical effects:
the vacuum tube shaking phenomenon during the suction inrush current of the vacuum contactor can be eliminated;
the phenomenon of unstable suction and bounce can be reduced when the vacuum contactor is sucked;
the power consumption of the whole vacuum contactor can be reduced, for example, the original 100W is reduced to 35W;
the arc discharge phenomenon in the vacuum tube when the vacuum contactor is disconnected 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. The utility model provides a hot stove vacuum contactor control circuit in ore deposit which characterized in that includes:
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; and
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 is powered by the input power supply in the pull-in stage, and is powered by the low-voltage switch power supply in the holding stage.
2. The submerged arc furnace vacuum contactor control circuit according to claim 1, characterized in that the input power supply is an alternating current power supply; 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 control circuit as claimed in 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 control circuit according to 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 control circuit according to 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 control circuit according to claim 5, characterized in that the first relay closing coil is a main coil of a low current intermediate relay.
7. The submerged arc furnace vacuum contactor control circuit according to claim 6, characterized in that the second relay closing coil is a main coil of a high-current intermediate relay.
8. The submerged arc furnace vacuum contactor control circuit according to any one of claims 1-4, characterized in that the capacitor provides a delayed supply of power to the second relay closing coil when the auxiliary switch is switched off to de-energize the second relay closing coil.
9. A method for controlling a submerged arc furnace vacuum contactor using a control circuit according to any of 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 a movable contact to be connected with a fixed contact through an electromagnet, and conducts the vacuum tube, and the electromagnetic coil unit consists of a first electromagnetic coil and a second electromagnetic coil;
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 vacuum tube is rapidly disconnected by back emf generated by the solenoid unit when the solenoid unit is de-energized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535255.4A CN114203485B (en) | 2021-12-15 | 2021-12-15 | Control circuit and control method for submerged arc furnace vacuum contactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111535255.4A CN114203485B (en) | 2021-12-15 | 2021-12-15 | Control circuit and control method for submerged arc furnace vacuum contactor |
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| CN114203485A true CN114203485A (en) | 2022-03-18 |
| CN114203485B CN114203485B (en) | 2024-08-13 |
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