CN211125488U - Quick change-over switch device and system - Google Patents
Quick change-over switch device and system Download PDFInfo
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- CN211125488U CN211125488U CN201922086497.4U CN201922086497U CN211125488U CN 211125488 U CN211125488 U CN 211125488U CN 201922086497 U CN201922086497 U CN 201922086497U CN 211125488 U CN211125488 U CN 211125488U
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Abstract
The utility model discloses a fast switching switch device, which comprises a switch unit, wherein the switch unit comprises a moving contact and a static contact, the switch device comprises a vacuum arc extinguish chamber, and the moving contact and the static contact are arranged in the vacuum arc extinguish chamber; the switch device comprises a quick action unit, wherein the quick action unit is connected with the moving contact and is used for providing the force for the moving contact to move relative to the fixed contact. The utility model provides a fast switch over switching device compares with traditional electromagnetism operating mechanism, and is obviously different in principle, compares with the electromagnetic switch principle, because the decay of magnetic field on the space is very fast, and electromagnetic switch's effort is by little to big, and power is little when starting promptly, and power is big when the action is ended (actuation mode), and the vortex dish effect is then power is big when starting down, and power is little when the action is ended (apart from the grow), does benefit to the quick start.
Description
Technical Field
The utility model belongs to the technical field of heavy current switch control in the electric wire netting, relate to the super fast circuit switching scheme of heavy current, concretely relates to non-solid-state realization fast switch over switching device, fast switch over system and realize fast switch over control method.
Background
In most important load scenes with continuous power supply requirements, an active fast switching control technology aiming at voltage sag and short-time voltage interruption is a key technology for the operation safety and stability of important loads.
And when the standby power supply is rapidly switched, the residual voltage support of the distributed power supply is utilized to improve the electric energy quality of the sensitive load. The method for matching the energy storage battery with the rapid switching is adopted for a passive user, the rapid switch is required to be rapidly switched on and switched off within 20ms, the energy storage battery car is used for carrying out power supply support on a 380V bus of an important load during the period, and the bus coupler switch is closed within 20ms, so that continuous power supply of the important load is realized.
In the treatment of voltage sag and short-time interruption by rapid switching, the duration of the voltage sag or short-time interruption on the bus is shortened. Currently, based on solid state switches, existing products in the industry can ensure that switching is completed within 13 ms. However, the switching scheme using solid-state switches also has some inherent drawbacks:
(1) due to conduction voltage drop of power electronic devices, power loss is large under the condition of large current, and special cooling equipment is needed to prevent the solid-state switch from overheating;
(2) the switching-off of the short-circuit current is divided into two types, namely forced switching and zero-crossing switching, the forced switching has the danger that the main power source side thyristor is not judged accurately, so that the main power source and the standby power source run in parallel, the zero-crossing switching needs to wait for the main power source side thyristor to naturally cross zero, and the switching time is greatly prolonged under some conditions.
(3) Due to the limitations of voltage endurance and capacity, in order to avoid the damage of the switch by overvoltage or overcurrent, a multi-stage semiconductor device series-parallel structure is often adopted, and the increase of the number of elements can reduce the overall reliability of the switch, so the voltage class of the current product is mainly limited to low voltage 400V, which also causes that the fast switching of the solid-state switch is difficult to be listed in a network-side solution.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of long action/switching time of a non-solid-state switch and solid-state quick switch-over in the prior art, a solution for realizing quick action based on the non-solid-state switch is provided.
According to one aspect of the present invention, there is provided a fast switching device comprising a switching unit including a moving contact and a stationary contact, wherein,
the switch device comprises a vacuum arc extinguish chamber, and the moving contact and the static contact are arranged in the vacuum arc extinguish chamber;
the switch device comprises a quick action unit, wherein the quick action unit is connected with the moving contact and is used for providing the force for the moving contact to move relative to the fixed contact.
As one of the alternatives, the switching device includes an insulator, both ends of the insulator are connected with the moving contact and the fast acting unit respectively, and the transmission of the force from the fast acting unit to the moving contact can be realized.
As one of the alternatives of the present invention, the fast acting unit includes a switching-off coil, a switching-on coil and an eddy current disc;
the switching-off coil, the switching-on coil and the vortex disc are coaxially arranged, and the vortex disc is arranged between the switching-off coil and the switching-on coil.
As one of the alternatives of the present invention, the quick action unit includes a transmission shaft, and the transmission shaft is connected to the vortex disc;
one end of the transmission shaft is arranged as a power output end of the quick action unit and can provide a moment for driving the moving contact to act when the quick action unit acts;
the axis of the transmission shaft is coincident with the axis of the vortex disc.
As one of the alternatives, the transmission shaft is connected with a bistable assembly, the bistable assembly is used for maintaining the position of the moving contact under the non-working state of the opening coil and the closing coil.
As an alternative of the present invention, a fast change-over switch system is characterized in that,
the opening coil is connected with an opening loop, and the opening loop comprises a first energy storage unit, a charging unit and a first control switch;
the first energy storage unit is used for storing and supplying working electric energy to the opening coil;
the first control switch is connected with the opening coil in series, is connected with the first energy storage unit and is used for controlling the on-off state of the first energy storage unit to the discharging loop of the opening coil;
and the electrode of the charging unit is connected with the electrode corresponding to the first energy storage unit and is used for charging the first energy storage unit.
As one of the alternatives of the present invention, the closing coil is connected to a closing loop, and the closing loop includes a second energy storage unit, a charging unit, and a second control switch;
the second energy storage unit is used for storing and supplying working electric energy for the closing coil;
the second control switch is connected with the closing coil in series, is connected with the second energy storage unit and is used for controlling the on-off state of a discharging loop of the closing coil by the second energy storage unit;
and the electrode of the charging unit is connected with the electrode corresponding to the second energy storage unit and is used for charging the second energy storage unit.
As an alternative of the present invention, the first energy storage unit and/or the second energy storage unit is/are a capacitor.
As one of the alternatives of the present invention, the first control switch and/or the second control switch is a thyristor switch circuit.
As an alternative of the present invention, a fast switching method of a fast transfer switching device, comprising the steps of:
a. starting the system, wherein the charging unit is a first energy storage unit and/or a second energy storage unit and is charged to a standby state;
b. and sending a signal to the first control switch or the second control switch to enable the first control switch or the second control switch to be conducted.
As one of the alternatives, the first control switch or the second control switch is turned on, and the charging unit continuously charges the first energy storage unit and/or the second energy storage unit.
The utility model provides a fast switch over switching device, system and fast switch over method are applicable to the voltage sag of active fast switch over and the short-term voltage interruption's short-term rapid detection and switching. By carrying out simulation test and comparison on the detection method, the detection of voltage sag and identification of faults inside and outside the area can be completed within 2 ms; then, through analysis of the transition process of the synchronous machine type distributed energy after fault isolation, an approximate solution of the residual voltage supporting characteristic of the synchronous machine type distributed energy after fault isolation is obtained, and verification is carried out through simulation; finally, the feasibility of active support fast switching governing voltage sag and short-time voltage interruption is verified through a physical dynamic simulation experiment. Such a switch solves the following problems of solid state fast transfer switches: due to the conduction voltage drop of the power electronic device, the power loss is large under the condition of large current, and special cooling equipment is needed to prevent the solid-state switch from overheating; the switching-off of the short-circuit current is divided into two types, namely forced switching and zero-crossing switching, the forced switching has the danger that the main power source side thyristor is not judged accurately, so that the main power source and the standby power source run in parallel, the zero-crossing switching needs to wait for the main power source side thyristor to naturally cross zero, and the switching time is greatly prolonged under some conditions. Due to the limitations of voltage endurance and capacity, in order to avoid the switch from being damaged by overvoltage or overcurrent, a multi-level semiconductor device series-parallel structure is often adopted, and the increase of the number of elements can reduce the overall reliability of the switch, so the voltage class of the current product is mainly limited to low voltage 400V. Compared with the traditional electromagnetic operating mechanism, the operating mechanism of the scheme has the advantages of obvious difference in principle, simple structure, high transmission efficiency and great improvement on the reliability and the action speed of the switch. The main principle of realizing rapid opening and closing is that a magnetic field which is extremely strong and changes rapidly at the moment is formed by instantaneously discharging a bisection/closing coil at a high speed through a capacitor, the magnetic field can act on the vortex disc and induce vortex on the vortex disc, and the vortex forms an induction magnetic field to interact with the coil magnetic field to form repulsive force. Compared with the electromagnetic switch principle, the attenuation of the magnetic field in space is fast, the acting force of the electromagnetic switch is from small to large, namely, the force is small when the electromagnetic switch is started, the force is large when the electromagnetic switch is operated (a suction mode), the force is large when the electromagnetic switch is started, and the force is small when the electromagnetic switch is operated (the distance is increased), so that the electromagnetic switch is favorable for quick start.
Drawings
Fig. 1 is a schematic diagram of an eddy current driven fast switch according to an embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in conjunction with the drawings and the accompanying drawings to further illustrate the technical means adopted to achieve the objects of the present invention.
As shown in fig. 1, in an optional embodiment of the present invention, a fast switching switch device is provided, which includes a switch unit, the switch unit includes a moving contact and a static contact, the switch device includes a vacuum interrupter, and the moving contact and the static contact are disposed in the vacuum interrupter; the switch device comprises a quick action unit, wherein the quick action unit is connected with the moving contact and is used for providing the force for the moving contact to move relative to the fixed contact. By using a switching mode of the movable and static contacts, voltage drop hardly exists in switching access of the switch, power is hardly instantaneous under the condition of large current, the heating phenomenon of corresponding switch points is weak, and the applicable scene is obviously enhanced.
As one of the optional embodiments of the present invention, the switching device includes an insulator, both end portions of the insulator are connected with the moving contact and the fast acting unit respectively, and the transmission of the force from the fast acting unit to the moving contact can be realized. The insulator is used for ensuring that the structural member and the control circuit of the quick action unit are insulated from the primary circuit controlled by the moving contact and the static contact, and the safe operation of the equipment is ensured. The transmission structure can be directly connected linear motion transmission, and can also realize diversified design of the device through mechanical transmission schemes such as levers, and the like, and can realize the schemes of miniaturization (nonlinear installation, changeable installation positions of all functional units), low-power starting (labor-saving levers realize low-power starting) and the like of equipment.
As one of the optional embodiments of the present invention, the fast acting unit includes a switching-off coil, a switching-on coil and an eddy current disc; the switching-off coil, the switching-on coil and the vortex disc are coaxially arranged, and the vortex disc is arranged between the switching-off coil and the switching-on coil. The main principle of realizing rapid opening and closing is that a magnetic field which is extremely strong and changes rapidly at the moment is formed by instantaneously discharging a bisection/closing coil at a high speed through a capacitor, the magnetic field can act on the vortex disc and induce vortex on the vortex disc, and the vortex forms an induction magnetic field to interact with the coil magnetic field to form repulsive force. Compared with the electromagnetic switch principle, the attenuation of the magnetic field in space is fast, the acting force of the electromagnetic switch is from small to large, namely, the force is small when the electromagnetic switch is started, the force is large when the electromagnetic switch is operated (a suction mode), the force is large when the electromagnetic switch is started, and the force is small when the electromagnetic switch is operated (the distance is increased), so that the electromagnetic switch is favorable for quick start.
As one of the optional embodiments of the present invention, the quick action unit includes a transmission shaft, and the transmission shaft is connected to the vortex disc; one end of the transmission shaft is arranged as a power output end of the quick action unit and can provide a moment for driving the moving contact to act when the quick action unit acts; the axis of the transmission shaft is coincident with the axis of the vortex disc.
As an alternative embodiment of the utility model discloses one of the scheme, the transmission shaft is connected with bistable subassembly, bistable subassembly is used for under separating brake coil and the combined floodgate coil non-operating condition, maintain the position of moving contact is unchangeable. The bistable component can be a bistable device based on a permanent magnet, and an electromagnet can also be used for providing stable torque of each stable state. For example, a movable suction cup and an electromagnet are arranged, and the electromagnet provides two positions for being connected with the movable washing cup through electromagnetic attraction. The two positions correspond to the two steady states of the system. The movable sucker is connected with the transmission shaft. In the motion process of the transmission shaft, the electromagnet of the bistable component does not provide steady-state current, and when the motion is finished, the electromagnet works to provide stable torque of the movable sucker. The control switch of the electromagnet can be controlled in combination with the system control process, so that the stable state of the switch and the smoothness of the action process are realized.
As one of the optional embodiments of the present invention, in a fast transfer switch system, the opening coil is connected to an opening circuit, and the opening circuit includes a first energy storage unit, a charging unit and a first control switch; the first energy storage unit is used for storing and supplying working electric energy to the opening coil; the first control switch is connected with the opening coil in series, is connected with the first energy storage unit and is used for controlling the on-off state of the first energy storage unit to the discharging loop of the opening coil; and the electrode of the charging unit is connected with the electrode corresponding to the first energy storage unit and is used for charging the first energy storage unit.
As one of the optional embodiments of the present invention, the closing coil is connected to a closing loop, and the closing loop includes a second energy storage unit, a charging unit, and a second control switch; the second energy storage unit is used for storing and supplying working electric energy for the closing coil; the second control switch is connected with the closing coil in series, is connected with the second energy storage unit and is used for controlling the on-off state of a discharging loop of the closing coil by the second energy storage unit; and the electrode of the charging unit is connected with the electrode corresponding to the second energy storage unit and is used for charging the second energy storage unit.
As an alternative embodiment of the present invention, the first energy storage unit and/or the second energy storage unit is/are a capacitor. The capacitor and the coil realize rapid and unimpeded discharge and can form strong variable current, and the current intensity and the change speed of the coil in the charging process are the key factors influencing the action speed of the switch.
As an alternative embodiment of the present invention, the first control switch and/or the second control switch is a thyristor switch circuit. Thyristors are used for this switching, so that the control phase time is very short.
The utility model provides a fast switch over switching device, system and fast switch over method are applicable to the voltage sag of active fast switch over and the short-term voltage interruption's short-term rapid detection and switching. By carrying out simulation test and comparison on the detection method, the detection of voltage sag and identification of faults inside and outside the area can be completed within 2 ms; then, through analysis of the transition process of the synchronous machine type distributed energy after fault isolation, an approximate solution of the residual voltage supporting characteristic of the synchronous machine type distributed energy after fault isolation is obtained, and verification is carried out through simulation; finally, the feasibility of active support fast switching governing voltage sag and short-time voltage interruption is verified through a physical dynamic simulation experiment. Such a switch solves the following problems of solid state fast transfer switches: due to the conduction voltage drop of the power electronic device, the power loss is large under the condition of large current, and special cooling equipment is needed to prevent the solid-state switch from overheating; the switching-off of the short-circuit current is divided into two types, namely forced switching and zero-crossing switching, the forced switching has the danger that the main power source side thyristor is not judged accurately, so that the main power source and the standby power source run in parallel, the zero-crossing switching needs to wait for the main power source side thyristor to naturally cross zero, and the switching time is greatly prolonged under some conditions. Due to the limitations of voltage endurance and capacity, in order to avoid the switch from being damaged by overvoltage or overcurrent, a multi-level semiconductor device series-parallel structure is often adopted, and the increase of the number of elements can reduce the overall reliability of the switch, so the voltage class of the current product is mainly limited to low voltage 400V. Compared with the traditional electromagnetic operating mechanism, the operating mechanism of the scheme has the advantages of obvious difference in principle, simple structure, high transmission efficiency and great improvement on the reliability and the action speed of the switch. The main principle of realizing rapid opening and closing is that a magnetic field which is extremely strong and changes rapidly at the moment is formed by instantaneously discharging a bisection/closing coil at a high speed through a capacitor, the magnetic field can act on the vortex disc and induce vortex on the vortex disc, and the vortex forms an induction magnetic field to interact with the coil magnetic field to form repulsive force. Compared with the electromagnetic switch principle, the attenuation of the magnetic field in space is fast, the acting force of the electromagnetic switch is from small to large, namely, the force is small when the electromagnetic switch is started, the force is large when the electromagnetic switch is operated (a suction mode), the force is large when the electromagnetic switch is started, and the force is small when the electromagnetic switch is operated (the distance is increased), so that the electromagnetic switch is favorable for quick start.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with the preferred embodiment, but not limited to the present invention, any skilled person in the art can make some modifications or equivalent changes to the technical content disclosed above without departing from the technical scope of the present invention, but all the technical matters of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A fast switching switch device comprises a switch unit, the switch unit comprises a moving contact and a static contact, and is characterized in that,
the switch device comprises a vacuum arc extinguish chamber, and the moving contact and the static contact are arranged in the vacuum arc extinguish chamber;
the switch device comprises a quick action unit, wherein the quick action unit is connected with the moving contact and is used for providing the force for the moving contact to move relative to the fixed contact.
2. A fast change-over switch device according to claim 1,
the switch device comprises an insulator, wherein two insulated end parts of the insulator are respectively connected with the moving contact and the quick action unit, and the transmission of force from the quick action unit to the moving contact can be realized.
3. A fast change-over switch device according to claim 1 or 2,
the quick action unit comprises a switching-off coil, a switching-on coil and an eddy current disc;
the switching-off coil, the switching-on coil and the vortex disc are coaxially arranged, and the vortex disc is arranged between the switching-off coil and the switching-on coil.
4. A fast change-over switch device according to claim 3,
the quick action unit comprises a transmission shaft, and the transmission shaft is connected with the vortex disc;
one end of the transmission shaft is arranged as a power output end of the quick action unit and can provide a moment for driving the moving contact to act when the quick action unit acts;
the axis of the transmission shaft is coincident with the axis of the vortex disc.
5. A fast change-over switch device according to claim 4,
the transmission shaft is connected with a bistable component, and the bistable component is used for maintaining the position of the moving contact unchanged under the non-working state of the opening coil and the closing coil.
6. A fast change-over switch system is characterized in that,
the energy-saving control circuit comprises an opening loop connected with an opening coil and a closing loop connected with a closing coil, wherein the opening loop comprises a first energy storage unit, a charging unit and a first control switch;
the first energy storage unit is used for storing and supplying working electric energy to the opening coil;
the first control switch is connected with the opening coil in series, is connected with the first energy storage unit and is used for controlling the on-off state of a discharge loop of the opening coil by the first energy storage unit;
and the electrode of the charging unit is connected with the electrode corresponding to the first energy storage unit and is used for charging the first energy storage unit.
7. A fast change-over switch system according to claim 6,
the closing loop comprises a second energy storage unit, a charging unit and a second control switch;
the second energy storage unit is used for storing and supplying working electric energy for the closing coil;
the second control switch is connected with the closing coil in series, is connected with the second energy storage unit and is used for controlling the on-off state of a discharge loop of the second energy storage unit to the closing coil;
and the electrode of the charging unit is connected with the electrode corresponding to the second energy storage unit and is used for charging the second energy storage unit.
8. A fast change-over switch system according to claim 6,
the first energy storage unit and/or the second energy storage unit are/is a capacitor.
9. A fast change-over switch system according to claim 6,
the first control switch and/or the second control switch are/is a thyristor switch circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922086497.4U CN211125488U (en) | 2019-11-28 | 2019-11-28 | Quick change-over switch device and system |
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| CN201922086497.4U CN211125488U (en) | 2019-11-28 | 2019-11-28 | Quick change-over switch device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029190A (en) * | 2019-11-28 | 2020-04-17 | 贵州电网有限责任公司 | Fast switching switch device, system and fast switching method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029190A (en) * | 2019-11-28 | 2020-04-17 | 贵州电网有限责任公司 | Fast switching switch device, system and fast switching method |
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