High-voltage assembly type contactless on-off switch

Abstract

The utility model relates to the technical field of switching high-voltage capacitors, in particular to a high-voltage assembly type contactless on-off switch, which comprises an insulating frame, a flat plate type silicon controlled rectifier, a resistance-capacitance absorption device, a trigger module, a zero-crossing resistor, a silicon controlled rectifier trigger and a power transformer, the flat plate type silicon controlled rectifier is fixedly installed in the insulating frame, a resistance-capacitance absorption device is arranged on one side of the flat plate type silicon controlled rectifier, a trigger module and a zero-crossing resistor are arranged on the other side of the flat plate type silicon controlled rectifier, and a silicon controlled rectifier trigger is fixedly installed on the outer side, close to the trigger module and the zero-crossing resistor, of the insulating frame. And a power transformer is arranged below the silicon controlled trigger. The high-voltage assembly type contactless on-off switch has remarkable technical effects in the aspects of reducing closing inrush current and overvoltage, improving dynamic response speed, enhancing durability and reliability, simplifying structure and installation, optimizing voltage sharing and triggering synchronization, enhancing heat dissipation performance, improving isolation safety, adapting to high-voltage and large-current requirements and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of switching high-voltage capacitors, and particularly relates to a high-voltage integrated contactless on-off switch. Background Art

[0002] In the power system, high-voltage reactive power compensation is an important means to improve the power factor of the power grid and reduce power loss. Traditional high-voltage reactive power compensation devices mostly use vacuum contactors (or vacuum circuit breakers) to switch capacitors in groups. However, this switching method has a series of significant disadvantages, which limit its effect and reliability in practical applications.

[0003] Firstly, when a vacuum contactor (or vacuum circuit breaker) connects a capacitor, due to the transient charging process of the capacitor, a large inrush current will be generated. The generation of this inrush current is closely related to the size of the inductive load, impedance, capacitance of the capacitor, and reactance in the circuit. Although the inrush current can quickly decay to a harmless level within a few milliseconds, its instantaneous peak current may cause serious damage to the switching equipment. Especially for switches with poor closing characteristics and slow closing speed, breakdown arcs may be generated due to incomplete closing of the contacts during the closing process, resulting in a sharp increase in the closing current, and even causing mechanical stress and vibration inside the switch, ultimately damaging the switching equipment.

[0004] Secondly, when a vacuum contactor (or vacuum circuit breaker) switches capacitors in groups, overvoltage is easily generated during the capacitor disconnection process. This overvoltage may not only damage the capacitor itself but also pose a threat to other equipment in the power grid.

[0005] In addition, as a mechanical contact switch, the dynamic response speed of a vacuum contactor (or vacuum circuit breaker) is relatively slow, making it difficult to adapt to places with fast load fluctuations. In these situations, the effect of reactive power compensation often fails to meet expectations, affecting the stability and economy of the power grid. At the same time, the switch with mechanical contacts is also limited by the mechanical life and is not suitable for frequent operation, which further restricts its application in dynamic reactive power compensation.

[0006] On the other hand, traditional high-voltage contactless switches usually adopt a tower structure or a layered superposition structure. These structural forms are complex, which not only increases the installation difficulty but also makes later maintenance and repair extremely difficult. In addition, these structures mostly use small-power modular thyristors as core components. Since the voltage and current withstand capabilities of a single module are limited, a large number of thyristors need to be connected in series in the series circuit to meet the requirements of high voltage and large current. However, the increase in the number of thyristors not only makes it difficult to solve the voltage sharing problem of each thyristor but also increases the difficulty and complexity of trigger synchronization.

[0007] In summary, traditional high-voltage reactive power compensation devices and high-voltage non-contact switches have many deficiencies and limitations in practical applications. Therefore, it is of great significance to develop a high-voltage integrated non-contact on-off switch with a simple structure, reliable performance, and flexible operation. Summary of the Invention

[0008] To solve the above problems, the present utility model provides a high-voltage integrated non-contact on-off switch, which shows remarkable technical effects in reducing inrush current and overvoltage during closing, improving dynamic response speed, enhancing durability and reliability, simplifying structure and installation, optimizing voltage equalization and trigger synchronization, enhancing heat dissipation performance, improving isolation safety, and meeting the requirements of high voltage and large current. It is of great significance for improving the power factor of the power grid and reducing power loss.

[0009] The technical solution of the present utility model is as follows:

[0010] A high-voltage integrated non-contact on-off switch includes an insulating frame, flat thyristors, a resistor-capacitor absorption device, a trigger module, a zero-crossing resistor, a thyristor trigger, and a power transformer; the flat thyristors are fixedly installed in the insulating frame, a resistor-capacitor absorption device is arranged on one side of the flat thyristors, a trigger module and a zero-crossing resistor are arranged on the other side of the flat thyristors, a thyristor trigger is fixedly installed on the outer side of the insulating frame close to the trigger module and the zero-crossing resistor, and a power transformer for supplying power to the thyristor trigger is installed below the thyristor trigger.

[0011] The resistor-capacitor absorption device includes a voltage-equalizing resistor and a uniform capacitor.

[0012] The resistor-capacitor absorption device is fixedly installed on the insulating frame through a support copper bar.

[0013] The trigger module and the zero-crossing resistor are fixedly installed on the insulating frame through an insulating board.

[0014] A cooling fan is arranged at the bottom of the insulating frame.

[0015] There are ten flat thyristors, among which five are connected in series in the forward direction and five are connected in parallel in the reverse direction.

[0016] The insulating frame is made of epoxy glass steel plate.

[0017] The power transformer is for converting AC 220V to AC 50V and AC 18V.

[0018] A creepage distance is reserved between the flat thyristors and the thyristor trigger to ensure the isolation of high-voltage signals and low-voltage signals.

[0019] An epoxy glass steel plate is arranged between the flat thyristor assembly and the thyristor trigger.

[0020] The beneficial effects of the present utility model are as follows:

[0021] 1. A high-voltage integrated contactless on-off switch disclosed by the present utility model uses a flat thyristor as the core component, achieving contactless on-off, avoiding the huge inrush current generated during closing of a vacuum contactor (or vacuum circuit breaker) and the overvoltage generated during opening, thereby protecting the safety of capacitors and other equipment in the power grid.

[0022] 2. A high-voltage integrated contactless on-off switch disclosed by the present utility model has a contactless design that greatly improves the dynamic response speed of the switch, enabling it to more quickly adapt to load fluctuations, achieve more accurate and efficient reactive power compensation, and enhance the stability and economy of the power grid.

[0023] 3. A high-voltage integrated contactless on-off switch disclosed by the present utility model has a contactless structure that eliminates the wear problem of mechanical contacts, extends the service life of the equipment, and reduces the maintenance cost caused by mechanical failures. In addition, the parallel and series design of flat thyristors enhances the overall reliability of the system.

[0024] 4. A high-voltage integrated contactless on-off switch disclosed by the present utility model adopts an integrated design. Compared with traditional tower or layered stacked structures, it greatly simplifies the overall structure of the switch, reduces the installation difficulty, and is also convenient for later maintenance and repair.

[0025] 5. A high-voltage integrated contactless on-off switch disclosed by the present utility model uses a resistor-capacitor absorption device composed of voltage-sharing resistors and uniform capacitors to effectively solve the voltage-sharing problem of thyristors. At the same time, the cooperation of the trigger module and the thyristor trigger ensures the synchronous triggering of thyristors, improving the working efficiency and stability of the switch.

[0026] 6. A high-voltage integrated contactless on-off switch disclosed by the present utility model is provided with a cooling fan at the bottom of the insulating frame, which can effectively reduce the heat generated during the operation of the equipment and ensure the long-term stable operation of the equipment.

[0027] 7. A high-voltage integrated contactless on-off switch disclosed by the present utility model leaves enough creepage distance between the flat thyristor and the thyristor trigger, and is provided with an epoxy glass steel plate to ensure effective isolation between high-voltage signals and low-voltage signals, improving the safety of the equipment.

[0028] 8. A high-voltage integrated contactless on-off switch disclosed by the present utility model. Through the series and parallel design of multiple flat thyristors, the high-voltage integrated contactless on-off switch meets the application requirements of high voltage and large current, and at the same time ensures the stability and reliability of the system. Description of the Drawings

[0029] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0030] In the drawings:

[0031] Figure 1 is the left side view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0032] Figure 2 is the right side view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0033] Figure 3 is the top view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0034] Figure 4 is the first-direction axonometric view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0035] Figure 5 is the second-direction axonometric view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0036] Figure 6 is the third-direction axonometric view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0037] Figure 7 is the fourth-direction axonometric view of a high-voltage integrated contactless on-off switch according to an embodiment of the present utility model;

[0038] The components represented by the reference numerals in the drawings are:

[0039] The present utility model: 1. Insulating frame, 2. Flat thyristor, 3. Voltage-sharing resistor, 4. Voltage-sharing capacitor, 5. Support copper bar, 6. Trigger module, 7. Zero-crossing resistor, 8. Thyristor trigger, 9. Power transformer, 10. Cooling fan. Detailed Embodiments

[0040] Such as Figures 1 to 7As shown in the figure, the high-voltage integrated non-contact on-off switch consists of components such as an insulating frame 1, a flat thyristor 2, a voltage-sharing resistor 3, a voltage-sharing capacitor 4 for a resistor-capacitor absorption device buffer absorption circuit, a support copper bar 5, a trigger module 6, a zero-crossing resistor 7, a thyristor trigger 8, a power transformer 9, and a cooling fan 10.

[0041] The insulating frame 1 of the high-voltage integrated non-contact on-off switch is composed of epoxy glass steel plates with insulating properties and high strength. The flat thyristor 2 is standing-mounted in the epoxy glass steel plate frame.

[0042] The resistor-capacitor absorption device buffer absorption circuit of the voltage-sharing resistor 3 and the voltage-sharing capacitor 4 is installed and fixed on one side of the flat thyristor 2 through a copper bar bracket 5; the zero-crossing resistor 7 and the trigger module 6 are installed and fixed on the other side of the flat thyristor 2 through a high-strength insulating board.

[0043] On the front of the insulating frame 1 of the high-voltage integrated non-contact on-off switch, a thyristor trigger 8 is installed. Below the thyristor trigger 8, a power conversion transformer 9 that converts AC 220V to AC 50V and AC 18V is installed. This power transformer 9 provides power for the internal circuit of the thyristor trigger 8. There is an epoxy glass steel plate with insulating properties and high strength between the flat thyristor 2 assembly and the thyristor trigger 8, and a sufficient creepage distance is left to ensure the isolation of high-voltage signals and low-voltage signals.

[0044] The structural form of the flat thyristor 2 is composed of ten flat thyristors connected in series in the forward direction and five in parallel in the reverse direction.

[0045] The structure of the insulating frame 1 is composed of epoxy glass steel plates with insulating properties and high strength.

[0046] The flat thyristor 2 used is a flat thyristor with a voltage of 6500V, a current of 350A, and an integrated heat sink and thyristor.

[0047] The trigger 8 of the high-voltage integrated non-contact on-off switch receives an external 12V signal, emits a trigger signal, and transmits the trigger signal through an optical fiber connection to the trigger module 6 of the thyristor assembly, enabling the five groups of thyristor components to conduct simultaneously.

[0048] At the bottom of the high-voltage integrated non-contact on-off switch, two high-power cooling fans 10 are installed. The cooling fans 10 blow air from the bottom up, quickly discharging the heat generated by the thyristor module, ensuring that the internal components of the thyristor module are always in the optimal working state.

[0049] In a specific embodiment:

[0050] Five thyristors in forward series connection and five thyristors in reverse parallel connection are electrically connected through high-quality wires or copper bars to ensure smooth current flow and uniform distribution. These connection points need to adopt professional welding or crimping techniques to ensure the reliability and durability of the connections.

[0051] The resistor-capacitor absorption device composed of voltage-sharing resistors 3 and voltage-sharing capacitors 4 is connected to one side of the flat thyristor 2 through a dedicated copper bar or wire to effectively absorb and buffer overvoltage and overcurrent. When connecting, attention should be paid to the polarities of the resistor and the capacitor to ensure correct connection.

[0052] The trigger module 6 is connected to the thyristor assembly through an optical fiber or other high-speed signal transmission lines to achieve fast and accurate transmission of trigger signals. Optical fiber connection has the advantages of strong anti-interference ability and small signal attenuation, which can ensure the stability and reliability of trigger signals.

[0053] The layout of components such as the flat thyristor 2, voltage-sharing resistors 3, and voltage-sharing capacitors 4 in the insulating frame 1 needs to be reasonably designed to ensure convenient electrical connection, good heat dissipation effect, and easy maintenance and repair. At the same time, sufficient gaps and creepage distances need to be left between components to prevent electrical breakdown and short-circuit phenomena.

[0054] The trigger 8 receives an external 12V signal, and this signal enters the device through a dedicated signal input interface. The signal input interface needs to adopt standard electrical interfaces (such as DB9, RJ45, etc.), and clearly mark the electrical characteristics and wiring methods of the interface to facilitate users to correctly connect the external signal source.

[0055] The device also needs to provide a power interface for connecting an external power supply to supply power to the device. The power interface needs to comply with relevant safety standards and specifications to ensure the safety and stability of the device during power supply.

[0056] When an external 12V signal is input to the trigger 8, the trigger will emit a trigger signal. This signal is transmitted to the trigger module 6 of the thyristor assembly through an optical fiber or other high-speed signal transmission lines, causing the five groups of thyristor assemblies to conduct simultaneously. The transmission process of the trigger signal needs to ensure the accuracy and reliability of the signal to avoid mis-triggering or missed triggering phenomena.

[0057] This high-voltage integrated non-contact on-off switch solves the problems of short service life of switching capacitors when using a vacuum contactor (or vacuum circuit breaker); solves the problem of slow response speed due to mechanical contacts when using a vacuum contactor (or vacuum circuit breaker) to switch capacitors; adopts the zero-crossing triggering method to trigger thyristors, avoiding the inrush current generated when the capacitor bank is put into operation and the overvoltage of the capacitor generated when it is cut off.

[0058] This high-voltage integrated non-contact on-off switch solves the problems of the traditional high-voltage non-contact switch, such as its complex structural form, extremely difficult installation and subsequent maintenance; at the same time, it solves the problems of a large number of thyristors in the traditional non-contact switch, extremely difficult achievement of thyristor voltage sharing, and difficult realization of trigger synchronization.

Claims

1. A high-voltage integrated non-contact on-off switch, characterized in that, It includes an insulating frame (1), a flat thyristor (2), a resistor-capacitor absorption device, a trigger module (6), a zero-crossing resistor (7), a thyristor trigger (8), and a power transformer (9); the flat thyristor (2) is fixedly installed in the insulating frame (1), a resistor-capacitor absorption device is arranged on one side of the flat thyristor (2), a trigger module (6) and a zero-crossing resistor (7) are arranged on the other side of the flat thyristor (2), a thyristor trigger (8) is fixedly installed on the outer side of the insulating frame (1) close to the trigger module (6) and the zero-crossing resistor (7), and a power transformer (9) for supplying power to the thyristor trigger (8) is installed below the thyristor trigger (8).

2. The high-voltage integrated non-contact on-off switch according to claim 1, wherein The resistor-capacitor absorption device includes a voltage-sharing resistor (3) and an equalizing capacitor (4).

3. The high-voltage integrated non-contact on-off switch according to claim 1, wherein The resistor-capacitor absorption device is fixedly installed on the insulating frame (1) through a support copper bar (5).

4. A high-voltage integrated non-contact on-off switch according to claim 1, characterized in that, The trigger module (6) and the zero-crossing resistor (7) are fixedly installed on the insulating frame (1) through an insulating board.

5. A high-voltage integrated non-contact on-off switch according to claim 1, characterized in that, A cooling fan (10) is arranged at the bottom of the insulating frame (1).

6. The high-voltage integrated non-contact on-off switch according to claim 1, characterized in that, There are ten flat thyristors (2), among which five are connected in series forward and five are connected in parallel backward.

7. A high-voltage integrated non-contact on-off switch according to claim 1, characterized in that, The insulating frame (1) is made of an epoxy glass steel plate.

8. A high-voltage integrated contactless on-off switch according to claim 1, characterized in that, The power transformer (9) is for converting AC 220V to AC 50V and AC 18V.

9. The high-voltage integrated non-contact on-off switch according to claim 1, characterized in that, A creepage distance for ensuring the isolation of high-voltage signals and low-voltage signals is left between the flat thyristor (2) and the thyristor trigger (8).

10. The high-voltage integrated non-contact on-off switch according to claim 9, characterized in that, An epoxy glass steel plate is arranged between the flat thyristor (2) assembly and the thyristor trigger (8).

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