CN113658815B - Interlocking control circuit for three-phase-sequence phase-change switch - Google Patents
Interlocking control circuit for three-phase-sequence phase-change switch Download PDFInfo
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- CN113658815B CN113658815B CN202110903004.0A CN202110903004A CN113658815B CN 113658815 B CN113658815 B CN 113658815B CN 202110903004 A CN202110903004 A CN 202110903004A CN 113658815 B CN113658815 B CN 113658815B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The utility model provides an interlocking control circuit for three same phase sequence phase change switches, including exchanging end and DC terminal, connect through the rectifier bridge between exchanging end and the DC terminal, exchange the end and including the first AC input portion that connects gradually, second AC input portion and third AC input portion, the both ends of first AC input portion, second AC input portion and third AC input portion link on 220V alternating current, the DC terminal includes the first DC output portion that connects gradually, second DC output portion and third DC output portion, the both ends of first DC output portion, second DC output portion and third DC output portion link on the positive and negative two of DC terminal output. The alternating current end and the direct current end are connected through the rectifier bridge, the rectifier bridge rectifies alternating current of the alternating current end into direct current of the direct current end, and the first interlocking circuit, the second interlocking circuit and the third interlocking circuit can be controlled in an interlocking way, so that only one interlocking circuit is in a conducting state in the same time, and the safety performance of the phase change switch is improved.
Description
Technical Field
The invention relates to the technical field of switch control devices, in particular to an interlocking control circuit for a three-phase-sequence phase-change switch.
Background
The phase change switch is a common switch device in a power grid and is usually used for solving the problem of three-phase unbalance, in the use process, the phase change switch is used for connecting user ends on two sides, in the use of the existing power grid, power supply processed by a transformer is generally three-phase power, but the user ends are usually single-phase power in daily use, and partial users also use the three-phase power, so that one end of each power transmission end in power use is three-phase power, the other end of each power transmission end is single-phase power, and at the moment, the phase change switch plays a role in switching balance of currents of each phase among the users, and the utilization rate and applicability of power of the power grid can be improved.
Most of the current phase change switches are used for switching single-phase electricity, so that phase sequence is required to be accurately connected during installation, when the phase sequence position is out of correspondence, the integral phase change switch cannot be used normally, three-phase electricity is required to be used in more places with the development of a power grid, a plurality of one-way phase change switches are required to be arranged at the switch positions when the three-phase electricity is switched by the existing phase change switches, different one-way phase change switches are controlled according to the use requirement of a user side, and accordingly the effect of controlling current balance of the user side is achieved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an interlocking control circuit capable of switching three-phase power through interlocking reaction.
The invention solves the technical problems by adopting the following technical scheme:
the interlocking control circuit for the three-phase-sequence phase-change switch comprises an alternating current end and a direct current end, wherein the alternating current end is connected with the direct current end through a rectifier bridge, and the rectifier bridge is used for rectifying alternating current input by the alternating current end into direct current output by the direct current end;
the alternating current end comprises a first alternating current input part, a second alternating current input part and a third alternating current input part which are sequentially connected, and two ends of the first alternating current input part, the second alternating current input part and the third alternating current input part are connected to 220V alternating current;
the direct current end comprises a first direct current output part, a second direct current output part and a third direct current output part which are sequentially connected, and two ends of the first direct current output part, the second direct current output part and the third direct current output part are connected to positive and negative poles output by the direct current end;
the first alternating current input part and the first direct current output part are combined to form a first interlocking circuit, the second alternating current input part and the second direct current output part form a second interlocking circuit, the third alternating current input part and the third direct current output part form a third interlocking circuit, the first interlocking circuit, the second interlocking circuit and the third interlocking circuit are used for performing phase-change operation, and when any one of the first interlocking circuit, the second interlocking circuit and the third interlocking circuit is conducted, the other two circuits are in an off state.
Preferably, the first ac input part includes a button N1 connected to the 220V ac, a coil of the relay J1, a normally closed contact of the relay J2, and a normally closed contact of the relay J3 are connected to a branch of the button N1, two ends of the button N1 are connected in parallel with a normally open contact of the button N2, the button N3, and the relay J1, and the button N1 is in an open state, and the button N2 and the button N3 are in a closed state.
Preferably, the first dc output unit includes a normally closed contact of the contactor K2 and a normally closed contact of the contactor K3 connected to the dc terminal, the normally closed contact of the contactor K3 is connected to a contact group of the relay J1 through an inductor L1-1, a normally open contact of the contact group of the relay J1 is connected to the inductor L1-1, the normally closed contact of the contact group of the relay J1 is connected to a resistor R1 through an inductor L1-2, the contact group of the relay J1 is connected to a capacitor C1, the capacitor C1 and the resistor R1 are connected to the dc terminal, when the button N1 is pressed, a branch where the button N1 is located is energized, a coil of the relay J1 is energized, the normally open contact of the relay J1 is closed, the contact group of the relay J1 is operated, the branch where the inductor L1-1 is located is turned on, and at this time, the button N1 is turned off, and the button N2 and the button N3 of the first ac input unit 1 is in a closed state.
Preferably, the second ac input part includes a button N2 connected to the 220V ac, a coil of the relay J2, a normally closed contact of the relay J1, and a normally closed contact of the relay J3 are connected to a branch of the button N2, two ends of the button N2 are connected in parallel with normally open contacts of the button N1, the button N3, and the relay J2, the button N2 is in an open state, and the button N1 and the button N3 are in a closed state.
Preferably, the second dc output unit includes a normally closed contact of the contactor K1 and a normally closed contact of the contactor K3 connected to the dc terminal, the normally closed contact of the contactor K3 is connected to a contact group of the relay J2 through an inductor L2-1, a normally open contact of the contact group of the relay J2 is connected to the inductor L2-1, the normally closed contact of the contact group of the relay J2 is connected to a resistor R2 through the inductor L2-2, the contact group of the relay J2 is connected to a capacitor C2, the capacitor C2 and the resistor R2 are connected to the dc terminal, when the button N2 is pressed, a branch where the button N2 is located is electrified, a coil of the relay J2 is electrified, the normally open contact of the relay J2 is closed, the contact group of the relay J2 is operated, the branch where the inductor L2-1 is located is turned on, and at this time, the button N2 is turned off, and the button N1 and the button N3 of the second ac input unit 2 is located in a closed state.
Preferably, the third ac input part includes a button N3 connected to the 220V ac, a coil of the relay J3, a normally closed contact of the relay J1, and a normally closed contact of the relay J2 are connected to a branch of the button N3, two ends of the button N3 are connected in parallel with normally open contacts of the button N1, the button N2, and the relay J3, the button N3 is in an open state, and the button N1 and the button N2 are in a closed state.
Preferably, the third dc output unit includes a normally closed contact of the contactor K1 and a normally closed contact of the contactor K2 connected to the dc terminal, the normally closed contact of the contactor K2 is connected to a contact group of the relay J3 through an inductor L3-1, a normally open contact of the contact group of the relay J3 is connected to the inductor L3-1, the normally closed contact of the contact group of the relay J3 is connected to a resistor R3 through an inductor L3-2, the contact group of the relay J3 is connected to a capacitor C3, the capacitor C3 and the resistor R3 are connected to the dc terminal, when the button N3 is pressed, a branch where the button N3 is located is energized, a coil of the relay J3 is energized, the normally open contact of the relay J3 is closed, the contact group of the relay J3 is operated, the branch where the inductor L3-1 is located is turned on, and at this time, the button N3 is turned off, and the button N1 and the button N2 of the third ac input unit 3 is in a closed state.
The invention has the advantages and positive effects that:
the alternating current end and the direct current end are connected through the rectifier bridge, the rectifier bridge rectifies alternating current of the alternating current end into direct current of the direct current end, and the first interlocking circuit, the second interlocking circuit and the third interlocking circuit can be controlled in an interlocking way, so that only one interlocking circuit is in a conducting state in the same time, and the working safety performance of the phase change switch is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a control circuit of the present invention.
In the figure: 1. a first ac input unit; 2. a second ac input unit; 3. a third ac input unit; 4. a first DC output unit; 5. a second DC output unit; 6. a third DC output unit; 7. a rectifier bridge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the interlocking control circuit for a three-phase-sequence phase-change switch of the invention comprises an alternating current end and a direct current end, wherein the alternating current end and the direct current end are connected through a rectifier bridge 7, the rectifier bridge 7 is used for rectifying alternating current input by the alternating current end into direct current output by the direct current end, and the rectifier bridge 7 only needs to adopt the structure of the interconnection of four diodes commonly used in the prior art.
The alternating current end comprises a first alternating current input part 1, a second alternating current input part 2 and a third alternating current input part 3 which are sequentially connected, and two ends of the first alternating current input part 1, the second alternating current input part 2 and the third alternating current input part 3 are connected to 220V alternating current.
The direct current end comprises a first direct current output part 4, a second direct current output part 5 and a third direct current output part 6 which are sequentially connected, and two ends of the first direct current output part 4, the second direct current output part 5 and the third direct current output part 6 are connected with positive and negative poles of the direct current end output.
The first alternating current input part 1 and the first direct current output part 4 are combined into a first interlocking circuit, the second alternating current input part 2 and the second direct current output part 5 are combined into a second interlocking circuit, the third alternating current input part 3 and the third direct current output part 6 are combined into a third interlocking circuit, and the first interlocking circuit, the second interlocking circuit and the third interlocking circuit are used for performing phase-change operation.
The first alternating current input part 1 comprises a button N1 connected to 220V alternating current, a coil of a relay J1, a normally-closed contact of a relay J2 and a normally-closed contact of a relay J3 are connected to a branch of the button N1, two ends of the button N1 are connected with the button N2, the button N3 and a normally-open contact of the relay J1 in parallel, the button N1 is in an open state, and the button N2 and the button N3 are in a closed state.
The first direct current output part 4 comprises a normally closed contact of a contactor K2 and a normally closed contact of a contactor K3 which are connected to a direct current end, the normally closed contact of the contactor K3 is connected with a contact group of a relay J1 through an inductor L1-1, a normally open contact of the contact group of the relay J1 is connected with the inductor L1-1, the normally closed contact of the contact group of the relay J1 is connected with a resistor R1 through the inductor L1-2, the contact group of the relay J1 is connected with a capacitor C1, and the capacitor C1 and the resistor R1 are connected to the direct current end.
The interlocking reaction of the first interlocking circuit is as follows: when the button N1 is pressed, the branch where the button N1 is located is electrified, the coil of the relay J1 is electrified, the normally open contact of the relay J1 is closed, the contact group of the relay J1 acts, the branch where the inductor L1-1 is located is conducted, the branch where the inductor L1-2 is located is disconnected, at this time, the button N1 is disconnected, and the button N2 and the button N3 of the first alternating current input part 1 are in a closed state, so that the branch where the first alternating current input part 1 is located is still in a conducting state.
The second alternating current input part 2 comprises a button N2 connected to 220V alternating current, a coil of a relay J2, a normally-closed contact of a relay J1 and a normally-closed contact of a relay J3 are connected to a branch of the button N2, two ends of the button N2 are connected with normally-open contacts of the button N1, the button N3 and the relay J2 in parallel, the button N2 is in an open state, and the button N1 and the button N3 are in a closed state.
The second direct current output part 5 comprises a normally closed contact of a contactor K1 and a normally closed contact of a contactor K3 which are connected to a direct current end, the normally closed contact of the contactor K3 is connected with a contact group of a relay J2 through an inductor L2-1, a normally open contact of the contact group of the relay J2 is connected with the inductor L2-1, the normally closed contact of the contact group of the relay J2 is connected with a resistor R2 through the inductor L2-2, the contact group of the relay J2 is connected with a capacitor C2, and the capacitor C2 and the resistor R2 are connected to the direct current end.
The interlocking reaction of the second interlock circuit is as follows: when the button N2 is pressed, the branch where the button N2 is located is electrified, the coil of the relay J2 is electrified, the normally open contact of the relay J2 is closed, the contact group of the relay J2 acts, the branch where the inductor L2-1 is located is conducted, the branch where the inductor L2-2 is located is disconnected, at the moment, the button N2 is disconnected, and the branch where the second alternating current input part 2 is located is still in a conducting state because the button N1 and the button N3 of the second alternating current input part 2 are in a closing state.
The third alternating current input part 3 comprises a button N3 connected to 220V alternating current, a coil of a relay J3, a normally-closed contact of a relay J1 and a normally-closed contact of a relay J2 are connected to a branch of the button N3, two ends of the button N3 are connected with a normally-open contact of the button N1, the button N2 and the relay J3 in parallel, the button N3 is in an open state, and the button N1 and the button N2 are in a closed state.
The third direct current output part 6 comprises a normally closed contact of a contactor K1 and a normally closed contact of a contactor K2 which are connected to a direct current end, the normally closed contact of the contactor K2 is connected with a contact group of a relay J3 through an inductor L3-1, a normally open contact of the contact group of the relay J3 is connected with the inductor L3-1, the normally closed contact of the contact group of the relay J3 is connected with a resistor R3 through the inductor L3-2, the contact group of the relay J3 is connected with a capacitor C3, and the capacitor C3 and the resistor R3 are connected to the direct current end.
The interlocking reaction of the third interlock circuit is as follows: when the button N3 is pressed, the branch where the button N3 is located is electrified, the coil of the relay J3 is electrified, the normally open contact of the relay J3 is closed, the contact group of the relay J3 acts, the branch where the inductor L3-1 is located is conducted, the branch where the inductor L3-2 is located is disconnected, at this time, the button N3 is disconnected, and the branch where the third alternating current input part 3 is located is still in a conducting state because the button N1 and the button N2 of the third alternating current input part 3 are in a closing state.
In particular, when any one of the first interlock circuit, the second interlock circuit, and the third interlock circuit is turned on, the other two circuits are in an off state, so that the safety of the entire circuit structure is ensured, that is, when any one of the first ac input unit 1, the second ac input unit 2, and the third ac input unit 3 is turned on, the other two branches are in an off state, for example, when the branch where the first ac input unit 1 is located is turned on, the coil of the relay J1 is energized, so that the normally closed contacts of the relay J1 in the second ac input unit 2 and the third ac input unit 3 are opened, and the branches of the second ac input unit 2 and the third ac input unit 3 are opened, and the contact sets of the relay J2 and the relay J3 in the second dc output unit 5 and the third dc output unit 6 are not operated because the second ac input unit 2 and the third ac input unit 3 are in the off state.
When any one of the first interlock circuit, the second interlock circuit and the third interlock circuit is conducted, and when the commutation switching is to be performed, the circuit after the commutation is conducted, and simultaneously, the circuit before the commutation is disconnected, for example, when the commutation from the first interlock circuit to the second interlock circuit is desired, the state before the commutation is: the first alternating current input part 1 is in a conducting state, the second alternating current input part 2 and the third alternating current input part 3 are in a disconnecting state, the phase change operation is carried out at the moment, the button N2 is pressed, the coil of the relay J2 is electrified, the normally open contact of the relay J2 is closed, the normally closed contact of the relay J2 in the first alternating current input part 1 is disconnected, the branch circuit where the first alternating current input part 1 is located is powered off, and only one interlocking circuit is guaranteed to be in a conducting working state at the same time.
The alternating current end and the direct current end are connected through the rectifier bridge, the rectifier bridge rectifies alternating current of the alternating current end into direct current of the direct current end, and the first interlocking circuit, the second interlocking circuit and the third interlocking circuit can be controlled in an interlocking way, so that only one interlocking circuit is in a conducting state in the same time, and the working safety performance of the phase change switch is improved.
It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the invention is not limited to the examples described in the detailed description, but rather falls within the scope of the invention as defined by other embodiments derived from the technical solutions of the invention by those skilled in the art.
Claims (7)
1. An interlocking control circuit for a three-phase-sequence phase change switch, which is characterized in that: the alternating current end is connected with the direct current end through a rectifier bridge (7), and the rectifier bridge (7) is used for rectifying alternating current input by the alternating current end into direct current output by the direct current end;
the alternating current end comprises a first alternating current input part (1), a second alternating current input part (2) and a third alternating current input part (3) which are sequentially connected, and two ends of the first alternating current input part (1), the second alternating current input part (2) and the third alternating current input part (3) are connected to 220V alternating current;
the direct current end comprises a first direct current output part (4), a second direct current output part (5) and a third direct current output part (6) which are sequentially connected, and two ends of the first direct current output part (4), the second direct current output part (5) and the third direct current output part (6) are connected to positive and negative poles output by the direct current end;
the first alternating current input part (1) and the first direct current output part (4) are combined to form a first interlocking circuit, the second alternating current input part (2) and the second direct current output part (5) form a second interlocking circuit, the third alternating current input part (3) and the third direct current output part (6) form a third interlocking circuit, the first interlocking circuit, the second interlocking circuit and the third interlocking circuit are used for performing phase change operation, and when any one of the first interlocking circuit, the second interlocking circuit and the third interlocking circuit is conducted, the other two circuits are in an off state.
2. An interlock control circuit for a three phase sequence commutation switch of claim 1, wherein: the first alternating current input part (1) comprises a button N1 connected to 220V alternating current, a coil of a relay J1, a normally-closed contact of a relay J2 and a normally-closed contact of a relay J3 are connected to a branch of the button N1, two ends of the button N1 are connected with normally-open contacts of the button N2, the button N3 and the relay J1 in parallel, the button N1 is in an open state, and the button N2 and the button N3 are in a closed state.
3. An interlock control circuit for a three phase sequence commutation switch of claim 2, wherein: the first direct current output part (4) comprises a normally closed contact of a contactor K2 and a normally closed contact of a contactor K3 which are connected to the direct current end, the normally closed contact of the contactor K3 is connected with a contact group of a relay J1 through an inductor L1-1, a normally open contact of the contact group of the relay J1 is connected with the inductor L1-1, the normally closed contact of the contact group of the relay J1 is connected with a resistor R1 through the inductor L1-2, the contact group of the relay J1 is connected with a capacitor C1, the capacitor C1 and the resistor R1 are connected to the direct current end, when the button N1 is pressed down, the contact group of the relay J1 acts, a branch where the inductor L1-1 is located is conducted, and a branch where the inductor L1-2 is located is disconnected.
4. An interlock control circuit for a three phase sequence commutation switch of claim 1, wherein: the second alternating current input part (2) comprises a button N2 connected to 220V alternating current, a coil of a relay J2, a normally-closed contact of a relay J1 and a normally-closed contact of a relay J3 are connected to a branch of the button N2, normally-open contacts of the button N1, the button N3 and the relay J2 are connected in parallel at two ends of the button N2, the button N2 is in an open state, and the button N1 and the button N3 are in a closed state.
5. An interlock control circuit for a three phase sequence commutation switch of claim 4, wherein: the second direct current output part (5) comprises a normally closed contact of a contactor K1 and a normally closed contact of a contactor K3 which are connected to the direct current end, the normally closed contact of the contactor K3 is connected with a contact group of a relay J2 through an inductor L2-1, a normally open contact of the contact group of the relay J2 is connected with the inductor L2-1, the normally closed contact of the contact group of the relay J2 is connected with a resistor R2 through the inductor L2-2, the contact group of the relay J2 is connected with a capacitor C2, the capacitor C2 and the resistor R2 are connected to the direct current end, when the button N2 is pressed down, the contact group of the relay J2 acts, a branch where the inductor L2-1 is located is conducted, and a branch where the inductor L2-2 is located is disconnected.
6. An interlock control circuit for a three phase sequence commutation switch of claim 1, wherein: the third alternating current input part (3) comprises a button N3 connected to 220V alternating current, a coil of a relay J3, a normally-closed contact of a relay J1 and a normally-closed contact of a relay J2 are connected to a branch of the button N3, normally-open contacts of the button N1, the button N2 and the relay J3 are connected in parallel at two ends of the button N3, the button N3 is in an open state, and the button N1 and the button N2 are in a closed state.
7. An interlock control circuit for a three phase sequence commutation switch of claim 6, wherein: the third direct current output part (6) comprises a normally closed contact of a contactor K1 and a normally closed contact of a contactor K2 which are connected to the direct current end, the normally closed contact of the contactor K2 is connected with a contact group of a relay J3 through an inductor L3-1, a normally open contact of the contact group of the relay J3 is connected with the inductor L3-1, the normally closed contact of the contact group of the relay J3 is connected with a resistor R3 through the inductor L3-2, the contact group of the relay J3 is connected with a capacitor C3, the capacitor C3 and the resistor R3 are connected to the direct current end, when the button N3 is pressed down, the contact group of the relay J3 acts, a branch where the inductor L3-1 is located is conducted, and a branch where the inductor L3-2 is located is disconnected.
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| CN202110903004.0A CN113658815B (en) | 2021-08-06 | 2021-08-06 | Interlocking control circuit for three-phase-sequence phase-change switch |
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| CN202110903004.0A CN113658815B (en) | 2021-08-06 | 2021-08-06 | Interlocking control circuit for three-phase-sequence phase-change switch |
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| CN113658815B true CN113658815B (en) | 2023-10-13 |
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| CN2042837U (en) * | 1988-06-15 | 1989-08-16 | 王兴茂 | Semi-conductor-relay iogical control device for elevator |
| CN2663293Y (en) * | 2003-11-07 | 2004-12-15 | 上海船厂 | Ship-borne 110V power supply electric shock protection device |
| CN201958576U (en) * | 2011-01-25 | 2011-09-07 | 安徽工程大学 | Automatic curtain control device |
| CN202854241U (en) * | 2012-07-25 | 2013-04-03 | 中铁十局集团电务工程有限公司 | Portable DC turnout switch machine test device |
| CN103296903A (en) * | 2013-05-29 | 2013-09-11 | 西安建筑科技大学 | Direct-current silicon commutating power supply |
| CN104716736A (en) * | 2015-04-04 | 2015-06-17 | 佛山蓝途科技有限公司 | Control circuit of double-power-supply changeover device |
| CN109278800A (en) * | 2018-09-05 | 2019-01-29 | 交控科技股份有限公司 | A kind of direct-current point machine control system and control method |
| CN112952760A (en) * | 2021-02-07 | 2021-06-11 | 浙江众合科技股份有限公司 | Point switch driving system with open-phase protection |
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