CN113299502A - Quick direct current change-over switch based on vacuum fracture magnetic control oscillation - Google Patents
Quick direct current change-over switch based on vacuum fracture magnetic control oscillation Download PDFInfo
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- CN113299502A CN113299502A CN202110439972.0A CN202110439972A CN113299502A CN 113299502 A CN113299502 A CN 113299502A CN 202110439972 A CN202110439972 A CN 202110439972A CN 113299502 A CN113299502 A CN 113299502A
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- current
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- oscillation
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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
- H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
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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
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
A direct current change-over switch based on vacuum fracture magnetic control oscillation is composed of a main current branch, an oscillation transfer branch, an energy dissipation branch, a magnetic field arc blowing assembly, an online monitoring system and a control system, wherein the main current branch, the oscillation transfer branch and the energy dissipation branch are connected in parallel. In a normal through-flow state, system current flows from the main loop, and rated through-flow is borne by the high-speed mechanical switch. When rated current is switched off, the high-speed mechanical switch and the magnetic field arc blowing component thyristor T are triggered to be switched on, under the action of transverse magnetic blowing, the capacitance of the transfer branch circuit, the stray inductance and the arc voltage generate resonance, the voltage is promoted in an oscillating mode, current is forcedly transferred to the oscillation transfer branch circuit, after the oscillation transfer branch circuit switches off the current, the current is transferred to the energy dissipation branch circuit, and finally the current switching-off is completed. The novel direct current change-over switch has the characteristics of high current transfer speed, strong breaking capacity, good fracture recovery characteristic and the like.
Description
Technical Field
The invention relates to a rapid direct current change-over switch based on vacuum fracture magnetic control oscillation, which applies a magnetic field to improve arc voltage through an external magnetic field arc blowing component, so that the arc voltage and a transfer branch generate resonance, and rapid transfer of current is realized.
Background
The direct current transfer switch is used as a vital protection element in a direct current power distribution system, and is widely applied to protection removal of faults of a converter station, conversion of an operation mode, isolation of maintenance and the like. Foreign companies such as ABB and Siemens, domestic companies such as West electric group, Henan province higher level and the like have corresponding products. Wherein, a direct current transfer switch product developed by Henan Hegao has been applied to hanging a net in a flexible direct current transmission project in the Zhoushan; the ZZLW series of products developed by West electric group, including ZZLW1-50 and ZZLW2-100, have been applied to the Kudzuvine dam converter station, the Jinhua station of Zhe-xi. The DC transfer switches mentioned above all use AC SF6Circuit breaker being a main break, SF6The circuit breaker has the defects of high cost, low breaking speed, large size and the like. And SF6The strong greenhouse gas has strong greenhouse effect, and the use and the emission of the gas are both limited internationally. In order to solve the problems, the invention provides a rapid direct current change-over switch based on vacuum fracture magnetic control oscillation, which has the advantages of low cost, high breaking speed, small volume, no pollution and the like.
The novel direct current change-over switch provided by the invention has the advantages that the transverse magnetic field is applied through the magnetic field arc blowing component to improve the arc voltage, and the arc voltage and the transfer branch are in resonance to realize the rapid transfer and the disconnection of the current. After the technology of the invention is adopted, under the same parameter grade, the cost of the direct current change-over switch is reduced by about 50%, the volume is reduced by about 70%, the switching-off speed is increased by 10 times of that of the traditional scheme, and the requirements of safety, reliability and economy of the current direct current distribution network can be met.
Disclosure of Invention
In view of the above-mentioned shortcomings or drawbacks of the prior art, an object of the present invention is to provide a novel dc converter switch and a control method thereof. By controlling the action of the high-speed mechanical switch HSS, the magnetic field arc blowing component is triggered according to the magnitude of the loop current to generate magnetic blow, and the fracture voltage and the transfer branch generate resonance, the current transfer is finally completed.
The invention adopts the following technical scheme:
a rapid direct current change-over switch based on vacuum fracture magnetic control oscillation is composed of a main current branch, an oscillation transfer branch, an energy dissipation branch, a magnetic field arc blowing assembly, an online monitoring system and a control system, wherein the main current branch, the oscillation transfer branch and the energy dissipation branch are connected in parallel and then led out through outlet terminals A1 and A2. The method is characterized in that:
(1) two ends of the main current branch high-speed mechanical switch are directly connected with the outlet ends A1 and A2 of the change-over switch, the high-speed mechanical switch can adopt a repulsive force, a permanent magnet or an electromagnetic mechanism meeting the requirement of the switching-on and switching-off speed, and the fractures can be connected in series and in parallel by one or more magnetic control vacuum fractures;
(2) the oscillation transfer branch consists of one or more transfer capacitors, and two ends of the oscillation transfer branch are connected in parallel with two ends of the main loop;
the online monitoring system is characterized by comprising: the device comprises a current sensor G0 for measuring the current state of a system, a current sensor G1 for measuring the current state of a main loop, a current sensor G2 for measuring the current state of an oscillation transfer branch circuit, a current sensor G3 for measuring the current state of a magnetic field arc-blowing assembly, a voltage sensor Vhs for measuring the fracture voltage of a high-speed mechanical switch HSS, a displacement sensor Pd for measuring the motion state of the high-speed mechanical switch, and an A/D conversion module and a communication module of a corresponding signal conditioning circuit;
wherein, direct current change over switch energy dissipation branch road characterized in that: the energy dissipation branch is formed by a zinc oxide arrester (MOV), and the MOV is connected in parallel at two ends of a break of the high-speed switch.
Wherein the high-speed mechanical switch of the direct current change-over switch is characterized in that: the high-speed mechanical switch is a high-speed mechanical switch or a permanent magnet switch based on electromagnetic repulsion.
The magnetic field arc-blowing component of the direct current conversion on-off switch is characterized in that: the magnetic field arc blowing component consists of a transverse magnetic coil, a pre-charging capacitor C, a thyristor T and a diode D. The magnetic field arc blowing components are connected in parallel at two ends of the main current branch, and an external transverse magnetic field in a single direction, a plurality of directions or a rotating type can be adopted.
Drawings
FIG. 1 is a schematic diagram of a switch body;
FIG. 2 is a schematic diagram of a diverter switch control system sensor profile;
fig. 3(a) to 3(e) are schematic diagrams illustrating the operation of the transfer switch of the present invention when the rated current is cut off;
FIG. 4 is a schematic view of a configuration of the break and field blowing assembly of the present invention;
FIGS. 5(a) to 5(c) are partial drive circuit topologies of the magnetic field arcing components of the present invention;
fig. 6, 7 and 8 show three embodiments included in the present invention.
Detailed Description
The following describes an embodiment of the present invention with reference to fig. 1 to 8.
Fig. 1 is a schematic structural diagram of a transfer switch body, which includes a main current branch, an oscillation transfer branch, an energy dissipation branch, and a transverse magnetic generation branch. Fig. 2 shows the distribution of sensors in a diverter switch. Which comprises the following steps: the current sensor G0 is used for measuring the current state of the system, the current sensor G1 is used for measuring the current state of the main loop, the current sensor G2 is used for measuring the current state of the oscillation transfer branch circuit, the current sensor G3 is used for measuring the current state of the magnetic field blowing assembly, the voltage sensor Vhs is used for measuring the fracture voltage of the high-speed mechanical switch HSS, the displacement sensor Pd is used for measuring the motion state of the high-speed mechanical switch, and the temperature sensor D4 is used for measuring the environmental temperature of the change-over switch.
Fig. 3(a) to 3(e) show the current transfer process during the specific breaking of the rated current of the transfer switch:
(1) as shown in fig. 3(a), in a normal through-current state, a system current flows in from the outlet terminal a1, passes through the mechanical switch HSS, and then flows out from the outlet terminal a 2;
(2) as shown in fig. 3(b), when the control system receives the rated on/off signal, the control system sends an opening command, and the high-speed mechanical switch HSS is turned on to start arcing.
(3) As shown in fig. 3(c), after a time delay, the control system triggers the magnetic field arc blowing assembly to conduct and apply transverse magnetic blowing to the fracture, and the current of the main loop is transferred to the oscillation transfer branch.
(4) After the current is transferred to the oscillation transfer branch, energy is temporarily stored by the capacitor, as shown in fig. 3 (d).
(5) As shown in fig. 3(e), the system energy is ultimately dissipated in the MOV;
FIG. 4 illustrates a positioning structure of the fracture and magnetic field arc-blowing assembly of the present invention;
FIGS. 5(a) through 5(c) show partial drive circuit topologies for the magnetic field arcing components of the present invention, including a capacitive matched semiconductor component discharge loop, a discharge loop with diode freewheeling, and a constant current source discharge loop;
FIG. 6 shows an example of the present invention;
FIG. 7 shows an example of the present invention;
FIG. 8 shows an example of the present invention;
the above is a further detailed description of the present invention with reference to specific preferred embodiments, and it should not be considered that the specific embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that several simple deductions or replacements can be made without departing from the concept of the present invention, for example, a unidirectional dc switch based on a unidirectional oscillation transfer branch and a unidirectional oscillation branch, etc., and all such deductions should be considered as belonging to the protection scope of the present invention as determined by the appended claims.
Claims (6)
1. The utility model provides a direct current change-over switch based on vacuum fracture magnetic control oscillation, comprises main current branch road, oscillation transfer branch road, energy dissipation branch road, magnetic field blowing subassembly and on-line monitoring system control system, and wherein main current branch road, oscillation transfer branch road, energy dissipation branch road are parallelly connected after, draw forth through terminal A1 and A2, and the magnetic field blowing subassembly produces transverse magnetic field for mechanical fracture, its characterized in that:
(1) two ends of the main current branch high-speed mechanical switch fracture are directly connected with the change-over switch outlet terminals A1 and A2, the high-speed mechanical switch can adopt repulsion force, a permanent magnet or an electromagnetic mechanism meeting the requirement of the breaking speed, and the fracture can be connected in series and in parallel by one or more magnetic control vacuum fractures;
(2) the oscillation transfer branch consists of one or more transfer capacitors, and two ends of the oscillation transfer branch are connected in parallel with two ends of the main loop;
(3) the online monitoring system measures the current and the current direction flowing through the outlet terminal A1 or A2, the current flowing through the main current branch, the current flowing through the oscillation transfer branch, the current flowing through the magnetic field arc-blowing component, the voltage at two ends of the high-speed mechanical switch and the switch displacement of the high-speed mechanical switch, and when the system current direction is from A1 to A2, the thyristor action of the high-speed mechanical switch HSS and the magnetic field arc-blowing component is controlled by measuring the current amplitude of the main current branch.
2. The dc transfer switch of claim 1, wherein: preferably, the first and second liquid crystal materials are,
under the normal through-current state of the system, the system current flows through the main current branch circuit, the high-speed mechanical switch bears rated through-current, the conduction threshold of the energy dissipation branch circuit is lower than the system voltage, and no current flows through the energy dissipation branch circuit;
when the rated current is switched off, the control system sends a brake-separating action instruction to the high-speed mechanical switch HSS, the high-speed mechanical switch acts, then according to information returned by the sensor, the control system triggers the thyristor T, the magnetic field arc-blowing component pre-charges the capacitor C to discharge to generate transverse magnetic blow to the fracture arc, the arc voltage rises, part of the current is transferred to the oscillation transfer branch, the arc voltage amplitude is increased in an oscillation mode due to the fact that the capacitance, the stray inductance and the arc voltage of the transfer branch resonate, the transfer current is gradually increased, the current zero-crossing and the fracture arc-quenching are finally achieved, after the current of the main loop passes through the zero, the energy is temporarily stored in the capacitor C2 of the transfer branch, and when the capacitance voltage reaches the lightning arrester conduction voltage, the current is transferred to the energy dissipation branch, and the current breaking is completed.
3. The dc transfer switch of claim 1, wherein the on-line monitoring system comprises: the device comprises a current sensor G0 for measuring the current state of a system, a current sensor G1 for measuring the current state of a main loop, a current sensor G2 for measuring the current state of an oscillation transfer branch circuit, a current sensor G3 for measuring the current state of a magnetic field blowing assembly, a voltage sensor Vhs for measuring the fracture voltage of a high-speed mechanical switch HSS, a displacement sensor Pd for measuring the motion state of the high-speed mechanical switch, and an A/D conversion module and a communication module of a corresponding signal conditioning circuit.
4. The dc transfer switch of claim 1, wherein: the energy dissipation branch is formed by a zinc oxide arrester (MOV), and the MOV is connected in parallel at two ends of a break of the high-speed switch.
5. The dc transfer switch of claim 1, wherein: the high-speed mechanical switch is a high-speed mechanical switch or a permanent magnet switch based on electromagnetic repulsion.
6. The direct current transfer switch according to any one of claims 1 to 5, wherein: the magnetic field arc blowing component consists of a transverse magnetic coil, a pre-charging capacitor C, a thyristor T and a diode D, is connected in parallel at two ends of a main current branch, and can adopt an externally-applied transverse magnetic field in a single direction, multiple directions or in a rotating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110439972.0A CN113299502A (en) | 2021-04-22 | 2021-04-22 | Quick direct current change-over switch based on vacuum fracture magnetic control oscillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110439972.0A CN113299502A (en) | 2021-04-22 | 2021-04-22 | Quick direct current change-over switch based on vacuum fracture magnetic control oscillation |
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| CN113299502A true CN113299502A (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110439972.0A Pending CN113299502A (en) | 2021-04-22 | 2021-04-22 | Quick direct current change-over switch based on vacuum fracture magnetic control oscillation |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105594084A (en) * | 2013-08-22 | 2016-05-18 | 瓦里安半导体设备公司 | Fast switch fault current limiter |
| CN106549357A (en) * | 2016-11-11 | 2017-03-29 | 西安交通大学 | A kind of magnetic field impulse sensing transfer type dc circuit breaker and its using method |
| CN106786348A (en) * | 2016-11-11 | 2017-05-31 | 西安交通大学 | One kind is based on bridge-type sensing transfer dc circuit breaker and its application method |
| CN109935479A (en) * | 2019-04-23 | 2019-06-25 | 西安交通大学 | Dc circuit breaker and its cutoff method based on vacuum magnetic blow-out transfer |
| CN110086152A (en) * | 2019-04-02 | 2019-08-02 | 陕西秦屿电器有限公司 | A kind of fast-speed direct current switch and its control method |
| CN110460014A (en) * | 2019-08-07 | 2019-11-15 | 西安交通大学 | Two-way hybrid dc circuit breaker and cutoff method based on capacitor preliminary filling electrotransfer |
-
2021
- 2021-04-22 CN CN202110439972.0A patent/CN113299502A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105594084A (en) * | 2013-08-22 | 2016-05-18 | 瓦里安半导体设备公司 | Fast switch fault current limiter |
| CN106549357A (en) * | 2016-11-11 | 2017-03-29 | 西安交通大学 | A kind of magnetic field impulse sensing transfer type dc circuit breaker and its using method |
| CN106786348A (en) * | 2016-11-11 | 2017-05-31 | 西安交通大学 | One kind is based on bridge-type sensing transfer dc circuit breaker and its application method |
| CN110086152A (en) * | 2019-04-02 | 2019-08-02 | 陕西秦屿电器有限公司 | A kind of fast-speed direct current switch and its control method |
| CN109935479A (en) * | 2019-04-23 | 2019-06-25 | 西安交通大学 | Dc circuit breaker and its cutoff method based on vacuum magnetic blow-out transfer |
| CN110460014A (en) * | 2019-08-07 | 2019-11-15 | 西安交通大学 | Two-way hybrid dc circuit breaker and cutoff method based on capacitor preliminary filling electrotransfer |
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