A fast switch for an intelligent distribution network

Abstract

The present invention discloses a fast switch for an intelligent distribution network, comprising: a drive control mechanism and a repulsive force mechanism, the drive control mechanism being electrically connected to the repulsive force mechanism; the repulsive force mechanism includes a base, a holding module, a moving rod, a tripping excitation coil, a closing excitation coil, a repulsive force disc, a static contact and a moving contact, one end of the holding module is slidably connected to the inner wall of the base, and the other end is connected to the moving rod; a first support plate and a second support plate are fixed on the base, the first support plate is located below the second support plate, a closing excitation coil is installed at the top of the first support plate, a tripping excitation coil is installed at the bottom of the second support plate, and the repulsive force disc is located between the closing excitation coil and the tripping excitation coil; the top of the moving rod passes through the first support plate, the repulsive force disc, and the second support plate and is connected to a cross plate, and moving contacts are connected to both sides of the cross plate, and static contacts are arranged above the moving contacts. The structure of the present invention is simple and convenient to use, and compared with the traditional spring mechanism circuit breaker, the tripping time and the closing time are shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit breakers, and more specifically relates to a fast switch for an intelligent distribution network. Background Art

[0002] A fast switch refers to a circuit breaker that can compress the fault clearing time to within one cycle, with a faster operating speed and capable of achieving "first-wave interruption". Currently, most fast switch devices in the power grid adopt spring operating mechanisms, which have many transmission components, a complex structure, and a long operating time. For example, for a fast switch using a spring mechanism, the opening time and closing time are relatively long and have a large dispersion.

[0003] Therefore, how to provide a fast switch for an intelligent distribution network with a fast interruption speed is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a fast switch for an intelligent distribution network, which has a simple structure and is convenient to use, and shortens the opening time and closing time compared with the traditional circuit breaker with a spring mechanism.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fast switch for an intelligent distribution network includes: a drive control mechanism and a repulsive force mechanism, and the drive control mechanism is electrically connected to the repulsive force mechanism; the repulsive force mechanism includes a base, a holding module, a moving rod, a tripping excitation coil, a closing excitation coil, a repulsive force disc, a static contact, and a moving contact. Among them, one end of the holding module is slidably connected to the inner wall of the base, and the other end is connected to the moving rod; a support plate one and a support plate two are fixed on the base, the support plate one is located below the support plate two, a closing excitation coil is installed at the top of the support plate one, a tripping excitation coil is installed at the bottom of the support plate two, the repulsive force disc is fixed on the moving rod, and the repulsive force disc is located between the closing excitation coil and the tripping excitation coil; the top of the moving rod sequentially passes through the support plate one, the repulsive force disc, and the support plate two and is connected to a cross plate, and the moving contacts are connected to both sides of the cross plate, and the static contact is arranged above the moving contact.

[0007] Preferably, the repulsive force mechanism further includes a vacuum arc extinguishing chamber, and the static contact is arranged in the vacuum arc extinguishing chamber.

[0008] Preferably, a chute is opened on the side wall of the base, and a plurality of equally spaced silica gel protrusions are installed in the chute. The holding module includes a fixed block and a connecting rod. The fixed block is installed at the bottom of the moving rod, and one end of the connecting rod is connected to the fixed block, and the other end extends into the chute.

[0009] Preferably, an insulating porcelain post is installed on the movable rod, and the insulating porcelain post is located between the cross plate and the second support plate.

[0010] Preferably, two driving control mechanisms are provided, including an input module, a control module, and an output module. The input module is electrically connected to the control module and the output module respectively; the output modules of the two driving control mechanisms are electrically connected to the opening excitation coil and the closing excitation coil respectively.

[0011] Preferably, the input module includes a power supply VCC, a resistor R1, a resistor R2, a MOS transistor Q1, and a diode D1; the power supply VCC is connected in series with the resistor R1 and the source electrode of the MOS transistor Q1 in sequence; a resistor R2 is connected in parallel between the source electrode and the gate electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to the diode D1; the gate electrode of the MOS transistor Q1 is also connected to the control module.

[0012] Preferably, the control module includes a control terminal, a MOS transistor Q2, a resistor R4, a resistor R5, and a resistor R7; a resistor R5 is connected in series between the gate electrode of the MOS transistor Q2 and the control terminal; a grounded resistor R7 is also connected to the gate electrode of the MOS transistor Q2; the source electrode of the MOS transistor Q2 is grounded; a resistor R4 is connected in series with the drain electrode of the MOS transistor Q2; the other end of the resistor R4 is connected to the resistor R2.

[0013] Preferably, the output module includes a diode D2, a resistor R3, a resistor R6, a triode Q3, and an output terminal. The positive electrode of the diode D2 is connected to the negative electrode of the diode D1 through the resistor R3. The negative electrode of the diode D2 is connected to the emitter of the triode Q3. The base electrode of the triode Q3 is connected to the resistor R3 and the resistor R6 respectively. The other end of the resistor R6 is connected to the collector of the triode, and the resistor R6 is grounded.

[0014] Preferably, a compensation circuit is connected in parallel with the fast switch.

[0015] Preferably, the compensation circuit includes a voltage transformer PT, a capacitor C1, a zinc oxide component, a damper, and a resistor R8. Among them, the damper and the resistor R8 connected in parallel are connected in series with the fast switch and then connected in parallel with the voltage transformer PT, the capacitor C1, and the damper.

[0016] The beneficial effects of the present invention are as follows:

[0017] The structure of the present invention is simple and convenient to use. The repulsive force mechanism adopting high-speed eddy current is beneficial to improving the opening and closing speed, shortening the opening time and closing time compared with the traditional spring mechanism circuit breaker, improving the movement accuracy of the moving rod, and the repulsive force mechanism does not require mechanical unlocking and locking devices, with few fault sources, and can operate safely and reliably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative work.

[0019] Figure 1 The attached drawing is a schematic structural diagram of the present invention.

[0020] Figure 2 The attached drawing is a schematic connection structure diagram of the connecting rod and the base of the present invention.

[0021] Figure 3 The attached drawing is a schematic circuit diagram of the drive control mechanism of the present invention.

[0022] Figure 4 The attached drawing is a schematic diagram of the compensation circuit of the present invention.

[0023] Among them, in the figure,

[0024] 1 - Quick switch; 2 - Base; 3 - Moving rod; 4 - Opening excitation coil; 5 - Closing excitation coil; 6 - Repulsive disk; 7 - Static contact; 8 - Moving contact; 9 - First support plate; 10 - Second support plate; 11 - Cross plate; 12 - Vacuum arc extinguishing chamber; 13 - Chute; 14 - Silica gel protrusion; 15 - Fixed block; 16 - Connecting rod; 17 - Insulating porcelain column; 18 - Zinc oxide component; 19 - Damper. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0026] Please refer to the attached Figures 1-4, the present invention provides a fast switch for an intelligent distribution network, comprising: a drive control mechanism and a repulsive force mechanism, the drive control mechanism being electrically connected to the repulsive force mechanism; the repulsive force mechanism includes a base 2, a holding module, a moving rod 3, a tripping excitation coil 4, a closing excitation coil 5, a repulsive force disk 6, a static contact 7 and a moving contact 8. Among them, one end of the holding module is slidably connected to the inner wall of the base 2, and the other end is connected to the moving rod 3; a support plate one 9 and a support plate two 10 are fixed on the base 2, the support plate one 9 is located below the support plate two 10, the closing excitation coil 5 is installed at the top end of the support plate one 9, the tripping excitation coil 4 is installed at the bottom end of the support plate two 10, the repulsive force disk 6 is fixed on the moving rod 3, and the repulsive force disk 6 is located between the closing excitation coil 5 and the tripping excitation coil 4; the top end of the moving rod 3 sequentially penetrates through the support plate one 9, the repulsive force disk 6, the support plate two 10 and then is connected to a cross plate 11, both sides of the cross plate 11 are connected with moving contacts 8, and static contacts 7 are arranged above the moving contacts 8.

[0027] The repulsive force mechanism further includes a vacuum arc extinguishing chamber 12, and the static contact 7 is arranged in the vacuum arc extinguishing chamber 12. Due to the excellent insulation of the vacuum in the vacuum arc extinguishing chamber 12, the medium-high voltage circuit can quickly extinguish the arc and suppress the current after cutting off the power supply, avoiding accidents and unexpected situations.

[0028] A chute 13 is opened on the side wall of the base 2, and a plurality of silicone protrusions 14 arranged at equal intervals are installed in the chute 13. The silicone protrusions 14 are easily deformed under external force. The holding module includes a fixed block 15 and a connecting rod 16. The fixed block 15 is installed at the bottom of the moving rod 3, and one end of the connecting rod 16 is connected to the fixed block 15, and the other end extends into the chute 13. When the closing excitation coil 5 generates an upward thrust on the repulsive force disk 6, the moving rod 3 drives the connecting rod 16 to slide upward in the chute 13. After the moving contact 8 contacts the static contact 7, under the action of the silicone protrusions 14, it plays a positioning role; when the tripping excitation coil 4 generates a downward thrust on the repulsive force disk 6, the moving rod 3 drives the connecting rod 16 to slide downward in the chute 13, and the moving contact 8 is separated from the static contact 7. Under the action of the silicone protrusions 14, it plays a positioning role to maintain the on and off states of the switch.

[0029] In another embodiment, an insulating porcelain column 17 is installed on the moving rod 3, and the insulating porcelain column 17 is located between the cross plate 11 and the support plate two 10. It can play an insulating role between the support plate two 10 and the cross plate 11, avoiding interference with the static contact 7 or the moving contact 8.

[0030] There are two drive control mechanisms, including an input module, a control module and an output module. The input module is electrically connected to the control module and the output module respectively; the output modules of the two drive control mechanisms are electrically connected to the tripping excitation coil and the closing excitation coil respectively.

[0031] The input module includes a power supply VCC, a resistor R1, a resistor R2, a MOS transistor Q1, and a diode D1; the power supply VCC is connected in series with the resistor R1 and the source electrode of the MOS transistor Q1 in sequence; a resistor R2 is connected in parallel between the source electrode and the gate electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to the diode D1; the gate electrode of the MOS transistor Q1 is also connected to the control module.

[0032] The control module includes a control terminal, a MOS transistor Q2, a resistor R4, a resistor R5, and a resistor R7; a resistor R5 is connected in series between the gate electrode of the MOS transistor Q2 and the control terminal; a grounded resistor R7 is also connected to the gate electrode of the MOS transistor Q2; the source electrode of the MOS transistor Q2 is grounded; a resistor R4 is connected in series to the drain electrode of the MOS transistor Q2; the other end of the resistor R4 is connected to the resistor R2.

[0033] The output module includes a diode D2, a resistor R3, a resistor R6, a triode Q3, and an output terminal. The positive electrode of the diode D2 is connected to the negative electrode of the diode D1 through the resistor R3. The negative electrode of the diode D2 is connected to the emitter of the triode Q3. The base of the triode Q3 is connected to the resistor R3 and the resistor R6 respectively. The other end of the resistor R6 is connected to the collector of the triode, and the resistor R6 is grounded.

[0034] Through the coordinated setting of the input module, the control module, and the output module, the present invention realizes the energization control of the opening excitation coil and the closing excitation coil, thereby completing the drive of the fast switch.

[0035] A compensation circuit is connected in parallel with the fast switch, which can not only solve the low voltage problem at the end of the heavy load line but also solve the voltage overshoot problem at the end of the line under light load or no load.

[0036] The compensation circuit includes a voltage transformer PT, a capacitor C1, a zinc oxide component 18, a damper 19, and a resistor R8. Among them, the parallel damper 19 and the resistor R8 are connected in series with the fast switch 1 and then connected in parallel with the voltage transformer PT, the capacitor C1, and the damper 19. During normal operation, the fast switch 1 is in the open state and the zinc oxide component 18 is not conducting. The capacitor C1 is connected in series in the circuit and can effectively play the role of series compensation. When a short circuit occurs downstream of the compensation circuit, the zinc oxide component 18 limits the voltage across the capacitor C1 to a lower level, drives the control mechanism to control the fast switch 1 to close within 15 ms, shorts the capacitor C1 together with the zinc oxide component 18, reliably protects the capacitor C1 from damage, and at the same time limits the short-circuit current to the level before compensation.

[0037] The structure of the present invention is simple and convenient to use. The repulsive force mechanism using high-speed eddy currents is beneficial to improving the opening and closing speeds, shortening the opening time and closing time compared with the traditional spring mechanism circuit breaker, improving the movement accuracy of the moving rod, and the repulsive force mechanism does not require mechanical unlocking and locking devices, with few failure sources, and can operate safely and reliably for a long time.

[0038] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fast switch for an intelligent distribution network, characterized in that, Comprising: A drive control mechanism and a repulsive force mechanism, the drive control mechanism being electrically connected to the repulsive force mechanism; the repulsive force mechanism includes a base, a holding module, a moving rod, a tripping exciting coil, a closing exciting coil, a repulsive force disc, a static contact and a moving contact. Among them, one end of the holding module is slidably connected to the inner wall of the base, and the other end is connected to the moving rod; a first support plate and a second support plate are fixed on the base, the first support plate is located below the second support plate, a closing exciting coil is installed at the top end of the first support plate, and a tripping exciting coil is installed at the bottom end of the second support plate. The repulsive force disc is fixed on the moving rod, and the repulsive force disc is located between the closing exciting coil and the tripping exciting coil; the top end of the moving rod sequentially passes through the first support plate, the repulsive force disc, the second support plate and then is connected to a cross plate, and moving contacts are connected to both sides of the cross plate, and the static contact is arranged above the moving contact. There are two drive control mechanisms, including an input module, a control module and an output module. The input module is electrically connected to the control module and the output module respectively; the output modules of the two drive control mechanisms are electrically connected to the tripping exciting coil and the closing exciting coil respectively. The input module includes a power supply VCC, a resistor R1, a resistor R2, a MOS transistor Q1 and a diode D1; the power supply VCC is sequentially connected in series with the resistor R1 and the source electrode of the MOS transistor Q1; the resistor R2 is connected in parallel between the source electrode and the gate electrode of the MOS transistor Q1; the drain electrode of the MOS transistor Q1 is connected to the diode D1; the gate electrode of the MOS transistor Q1 is also connected to the control module. A compensation circuit is connected in parallel with the fast switch.

2. The fast switch for an intelligent distribution network according to claim 1, characterized in that, The repulsive force mechanism further includes a vacuum arc extinguishing chamber, and the static contact is arranged in the vacuum arc extinguishing chamber.

3. The fast switch for an intelligent distribution network according to claim 1 or 2, characterized in that, A chute is opened on the side wall of the base, and a plurality of silicone protrusions arranged at equal intervals are installed in the chute. The holding module includes a fixed block and a connecting rod. The fixed block is installed at the bottom of the moving rod, and one end of the connecting rod is connected to the fixed block, and the other end extends into the chute.

4. A fast switch for an intelligent distribution network according to claim 1, characterized in that, An insulating porcelain column is installed on the moving rod, and the insulating porcelain column is located between the cross plate and the second support plate.

5. A fast switch for an intelligent distribution network according to claim 1, characterized in that, The control module includes a control terminal, a MOS transistor Q2, a resistor R4, a resistor R5 and a resistor R7; the resistor R5 is connected in series between the gate electrode of the MOS transistor Q2 and the control terminal; the gate electrode of the MOS transistor Q2 is also connected to a grounded resistor R7; the source electrode of the MOS transistor Q2 is grounded; the drain electrode of the MOS transistor Q2 is connected in series with the resistor R4; the other end of the resistor R4 is connected to the resistor R2.

6. The fast switch for an intelligent distribution network according to claim 5, characterized in that, The output module includes a diode D2, a resistor R3, a resistor R6, a triode Q3 and an output terminal. The positive electrode of the diode D2 is connected to the negative electrode of the diode D1 through the resistor R3. The negative electrode of the diode D2 is connected to the emitter of the triode Q3. The base electrode of the triode Q3 is connected to the resistor R3 and the resistor R6 respectively. The other end of the resistor R6 is connected to the collector of the triode, and the resistor R6 is grounded.

7. The fast switch for an intelligent distribution network according to claim 1, wherein, The compensation circuit includes a potential transformer PT, a capacitor C1, a zinc oxide component, a damper, and a resistor R8. Among them, the damper in parallel with the resistor R8 is connected in series with the fast switch and then connected in parallel with the potential transformer PT, the capacitor C1, and the damper.

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