A high-voltage circuit breaker and an energy storage control protection module thereof

Abstract

The present application belongs to the secondary control technical field of high-voltage electrical apparatus, and relates to a high-voltage circuit breaker and an energy storage control protection module thereof. On the basis of meeting the energy storage loop driving and overtime protection, the driving loop is additionally provided with a thyristor and a hard contact switch, so as to effectively avoid the problem of system shutdown caused by driving loop failure, and has the functions of timing and loop current real-time display, and has the function of loop overload protection, thereby solving the problem of overloading and burning of the energy storage motor caused by mechanical failure and other reasons of the circuit breaker energy storage loop. The development is a component replacing a plurality of electrical components in the original loop, has a small occupied space and low cost, and has a wide market demand.

Description

Technical Field

[0001] This invention belongs to the field of secondary control technology of high-voltage electrical appliances, specifically relating to a high-voltage circuit breaker and its energy storage control and protection module. Background Technology

[0002] High-voltage circuit breakers are typically operated by springs or hydraulic mechanisms. During operation, the circuit breaker mechanism stores rated energy. When operation is required, this energy is released via the circuit breaker's opening and closing coils, allowing the circuit breaker to operate. Depending on the mechanism type, the stored energy can be in the form of a compressed spring or compressed gas. Figure 1 As shown, when the energy stored in the operating mechanism is insufficient to the rated value, the "insufficient energy signal contact" of the mechanism closes, activating the energy storage circuit. After the rated energy storage is completed, the signal contact opens, completing the energy storage action. Simultaneously, the energy storage circuit is designed with a function to cut off the energy storage circuit and issue an alarm signal upon energy storage timeout. This is primarily to prevent damage to the mechanism caused by the energy storage circuit failing to disconnect the power supply due to a fault in the "insufficient energy signal contact" after the rated energy storage is completed, thus preventing continued energy storage. It also serves to determine if a fault has occurred in the energy storage circuit by whether energy storage can be completed within the specified time.

[0003] Currently, both domestic and international high-voltage circuit breaker mechanisms for energy storage drive and protection use separate electrical components. The drive circuit is controlled by a single component, and once a fault occurs, the entire system will fail to operate. Furthermore, its protection function is limited to timeout protection. During energy storage, it is impossible to intuitively display the current and time during the energy storage process; it cannot provide overload protection against mechanical failures or other causes; and the use of separate components occupies a large space, has complex external wiring, and is also costly. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage circuit breaker and its energy storage control and protection module to solve the problem that the energy storage process cannot operate normally due to mechanical failures or other reasons in the circuit breaker drive circuit.

[0005] To address the aforementioned technical problems, this invention provides a high-voltage circuit breaker energy storage control and protection module, comprising a drive circuit and a control unit. The drive circuit is connected in series with the energy storage circuit of the energy storage motor, and a thyristor and a hard contact switch are connected in series in the drive circuit. The control unit controls the connection between the thyristor and the hard contact switch, and when controlling the drive circuit to conduct, it first controls the hard contact switch to conduct and then controls the thyristor to conduct; and when controlling the drive circuit to disconnect, it first controls the thyristor to disconnect and then controls the hard contact switch to disconnect.

[0006] Its beneficial effects are as follows: This invention solves the problem of system failure caused by mechanical failure in circuit breaker drive circuit through drive circuit and control unit, wherein the sequential conduction and disconnection of hard contact switch and thyristor is achieved by the sequential conduction and disconnection of hard contact switch and thyristor. It occupies little space and has low cost.

[0007] Furthermore, an RC filter circuit is connected in parallel across the two ends of the thyristor.

[0008] Its beneficial effect is that it can effectively filter out noise in the circuit.

[0009] Furthermore, the control unit controls the connection to the thyristor via a driver chip; the two input terminals of the driver chip are respectively connected to the output terminal of the control unit and the first power supply; one of the two output terminals is connected to the input terminal of the thyristor, and the other of the two output terminals is connected to the control terminal and the output terminal of the thyristor.

[0010] Its beneficial effects are: by controlling the connection of the thyristor through the driver chip, the thyristor is used to realize the conduction and shutdown of the circuit, thus optimizing the system.

[0011] Furthermore, the control and protection module also includes a current acquisition unit, which is used to acquire the drive circuit current and is connected to the control unit to transmit the acquired current to the control unit, so that the control unit can determine whether the energy storage circuit current of the energy storage motor is overloaded based on the drive circuit current.

[0012] Its beneficial effects are: collecting data from the circuit during the energy storage process and preventing excessive current from damaging the equipment.

[0013] Furthermore, the current acquisition unit includes a current sensor, the positive input terminal and the reverse input terminal of the current sensor are respectively connected to the input terminal and the output terminal of the drive circuit; the output terminal of the current sensor is connected to the control unit through an RC filter circuit.

[0014] Its beneficial effects are: collecting circuit data during the energy storage process, preventing excessive current from damaging the equipment, and effectively filtering out circuit noise by adding an RC filter circuit.

[0015] Furthermore, the control and protection module also includes an alarm unit, which includes multiple parallel alarm branches. Each alarm branch is equipped with a corresponding indicator light and control switch, and the control unit controls and connects each control switch.

[0016] Its beneficial effects are: the alarm unit provides alarm prompts for different energy storage states so that fault problems can be dealt with in a timely manner.

[0017] Furthermore, each control switch is a contact of a corresponding relay, and the coil of each relay is connected in series between the second power supply and the input terminal of the switching transistor. The output terminal of the switch is grounded. The control terminals of the second power supply and the switch are respectively connected to the two ends of the secondary side of the optocoupler. One end of the primary side of the optocoupler is connected to the corresponding interface of the control unit, and the other end is grounded.

[0018] Its beneficial effects are: to avoid damage to the mechanism caused by the inability to disconnect the power supply due to component failure after the rated energy storage is completed, resulting in continuous energy storage.

[0019] Furthermore, the alarm unit includes three parallel alarm branches, and each indicator light is used to indicate three states: energy storage in progress, energy storage timeout, and energy storage circuit current overload.

[0020] Furthermore, the control unit is also used to perform energy storage timing when the drive circuit is on, and to control the drive circuit to disconnect when energy storage ends or energy storage timeout occurs.

[0021] Its beneficial effects are: timing the energy storage process, disconnecting the circuit when the energy storage timeout is reached, and improving system safety.

[0022] To address the aforementioned technical problems, the present invention also provides a high-voltage circuit breaker, including the high-voltage circuit breaker energy storage control and protection module as described above.

[0023] Its beneficial effects are as follows: The high-voltage circuit breaker of the present invention adopts a high-voltage circuit breaker energy storage control and protection module, which solves the problem of system failure caused by mechanical failure and other reasons through the sequential conduction and disconnection of hard contacts and thyristors via the drive circuit and control unit. It occupies less space and has low cost. Attached Figure Description

[0024] Figure 1 It is the energy storage circuit of the existing high-voltage circuit breaker mechanism;

[0025] Figure 2 This is a functional diagram of the high-voltage circuit breaker energy storage control and protection module of the present invention;

[0026] Figure 3 This is the driving unit circuit of the present invention;

[0027] Figure 4 This is the current acquisition unit circuit of the present invention;

[0028] Figure 5 This is the signal relay drive circuit of the present invention;

[0029] Figure 6 This is a panel diagram of the high-voltage circuit breaker energy storage control and protection device of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Example of a high-voltage circuit breaker energy storage control and protection module:

[0032] like Figure 2 As shown, the present invention includes a drive circuit ( Figure 2 The system comprises a drive unit, a current acquisition unit, a control unit (in this embodiment, a signal processing and display drive unit), and an alarm unit. The drive circuit is connected in series with the power supply circuit of the energy storage motor to receive signals and drive the energy storage motor. The current acquisition unit is used to acquire the circuit current and output a voltage signal to the control unit. The alarm unit includes multiple parallel alarm branches, each with a corresponding indicator light and control switch connected in series. The control unit controls the connection of each control switch. The control unit includes a processor (in this embodiment, a CPU) responsible for processing and judging the received signals, issuing control commands, and transmitting display information of current and timing values. The processor has a timing unit for timing energy storage when the drive circuit is on and controlling the drive circuit to disconnect when energy storage ends or timeout occurs.

[0033] The specific circuit of the drive circuit is as follows: Figure 3 As shown, the drive circuit is connected in series with the power supply circuit of the energy storage motor. A thyristor T1 and a hard-contact switch K1E are connected in series in the drive circuit. An RC filter circuit consisting of resistor R9 and capacitor C14 is connected in parallel across the thyristor T1. The hard-contact switch K1E provides physical isolation in the circuit. A capacitor C13 is connected in parallel across the hard-contact switch K1E. The drive unit is optically isolated from external components, and a short-delay method is used in the software to eliminate jitter interference. The drive chip U4 controls the thyristor. The two input terminals of the drive chip U4 (pin 1 and pin 2) are connected to the output terminal of the control unit and the first power supply, respectively. One of the two output terminals (pin 6) is connected to the input terminal of the thyristor, and the other output terminal (pin 4) is connected to the control terminal and output terminal of the thyristor.

[0034] The drive circuit receives an "insufficient energy signal," and after judgment, the drive circuit is turned on and drives the energy storage motor. When the drive circuit is turned on, the hard contact switch is activated first, and then the thyristor is activated. When the circuit is turned off, the thyristor is deactivated first, the current stops at the zero-crossing point, and then the hard contact switch is deactivated, completing the connection and disconnection of the motor circuit.

[0035] The specific circuit of the current acquisition unit is as follows: Figure 4As shown, the motor current acquisition unit consists of a Hall element and related circuits, including a current sensor U11. The positive input terminal IP+ and the reverse input terminal IP- of the current sensor U11 are connected to the input and output terminals of the drive circuit, respectively. The output terminal IN_A of the current sensor U11 is connected to the control unit. An RC filter circuit composed of R49 and C37 is set between the output terminal of the current sensor U11 and the control unit. The Hall element converts the current in the motor circuit into a voltage signal that the CPU can recognize.

[0036] The control unit consists of a CPU, a display drive circuit, a control output circuit, and a timing unit. The timing unit, powered by the CPU, starts timing after energy storage is activated, disconnects the energy storage circuit after a timeout, and sends a timeout alarm signal. It is responsible for processing and judging received signals, issuing control commands, and displaying real-time current and timing values.

[0037] Alarm unit such as Figure 2 As shown, the system includes alarm unit 1 and alarm unit 2. Alarm unit 1 includes two parallel alarm branches, one for indicating energy storage in progress and the other for indicating energy storage timeout. Alarm unit 2 includes three parallel alarm branches, one for indicating energy storage in progress, the other for energy storage timeout, and the other for overload. Each alarm branch is equipped with a corresponding indicator light and a control switch, and the control unit controls the connection of each control switch.

[0038] Taking the energy storage timeout signal as an example, the drive circuit controlling each control switch is as follows: Figure 5 As shown, the control switch is the contact of a relay. The relay coil K2A ​​is connected in series between the second power supply and the input terminal of transistor Q4. The output terminal of transistor Q4 is grounded. The power supply and the control terminal of transistor Q4 are respectively connected to the two ends of the secondary side of optocoupler U3. One end of the primary side of optocoupler U3 is connected to the corresponding interface of the control unit through resistor R13, and the other end is grounded. Furthermore, diode D6 is connected in parallel across the relay coil K2A. The remaining control switch drive circuits are similar to... Figure 5 Similarly, I will not go into details here.

[0039] Display module such as Figure 6 As shown, it consists of a setting button and a display unit, used to set the overload current value, energy storage time value, overload coefficient, etc.

[0040] Specific control process:

[0041] When the energy stored in the circuit breaker mechanism is lower than the rated value, the "insufficient energy" signal contact of the mechanism is activated. The drive circuit receives this signal, and after the control unit performs anti-interference judgment, it sends a start energy storage command to the drive circuit. The hard contact switch K1E and the thyristor T1 in the drive circuit are turned on sequentially, and the mechanism begins energy storage. During energy storage, the current information of the drive circuit is collected in real time by the current acquisition unit, and the processed value is sent to the CPU of the control unit for calculation and judgment. If the current value exceeds the set value, the CPU of the control unit calculates the inverse time limit action time. When the overload condition is reached, the energy storage circuit is disconnected and an overload alarm signal is issued. When the drive circuit is disconnected, the thyristor is disconnected first, the current is disconnected at the zero crossing point, and then the hard contact switch is disconnected, completing the connection and disconnection of the motor circuit. If the overload value is not reached, energy storage continues. The display module displays the circuit current and the countdown time of the energy storage overtime protection in real time during the energy storage process. If the circuit breaker completes energy storage to the rated value within the time limit specified by the energy storage protection mechanism, the control unit sends a command to disconnect the energy storage circuit. This causes the thyristor T1 and hard contact switch K1E in the drive branch to disconnect sequentially, completing a normal energy storage operation. If the energy storage time exceeds the set value and the rated value is still not stored, the control unit sends a command to disconnect the energy storage, ending the energy storage process and issuing an energy storage timeout error signal.

[0042] This invention, while fulfilling the requirements for energy storage circuit drive and overtime protection, also features timing and real-time circuit current display functions, as well as circuit overload protection. It solves the problem of overload burnout of the energy storage motor caused by mechanical failures in the circuit breaker's energy storage circuit. Furthermore, it is developed as a single component replacing multiple electrical components in the original circuit, occupying less space and at a lower cost. It has broad market demand.

[0043] High-voltage circuit breaker examples

[0044] The high-voltage circuit breaker of the present invention includes a high-voltage circuit breaker energy storage control and protection module. The specific composition has been described in detail in the section on high-voltage circuit breaker energy storage control and protection module and will not be repeated here.

[0045] Specific implementation methods have been given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention lies in the above basic scheme. For those skilled in the art, designing various modified models, formulas, and parameters based on the teachings of the present invention does not require creative effort. Changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A high-voltage circuit breaker energy storage control and protection module, characterized in that, Includes drive circuit, control unit and alarm unit; The drive circuit is used to connect in series with the energy storage circuit of the energy storage motor. A thyristor and a hard contact switch are connected in series in the drive circuit. The control unit controls the connection between the thyristor and the hard contact switch. When the drive circuit is turned on, the hard contact switch is turned on first and then the thyristor is turned on. When the drive circuit is turned off, the thyristor is turned off first and then the hard contact switch is turned off. The alarm unit includes multiple parallel alarm branches, each with a corresponding indicator light and control switch connected in series. The control unit controls and connects each control switch. Each control switch is a contact of a corresponding relay. The coil of each relay is connected in series between the second power supply and the input terminal of the switching transistor. The output terminal of the switching transistor is grounded. The control terminals of the second power supply and the switching transistor are respectively connected to the two ends of the secondary side of the optocoupler. One end of the primary side of the optocoupler is connected to the corresponding interface of the control unit, and the other end of the primary side of the optocoupler is grounded. The control unit is also used to perform energy storage timing when the drive circuit is on, and to control the drive circuit to disconnect when energy storage ends or energy storage timeout.

2. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, An RC filter circuit is connected in parallel across the two ends of the thyristor.

3. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The control unit controls the thyristor via a driver chip; the two input terminals of the driver chip are respectively connected to the output terminal of the control unit and the first power supply; one of the two output terminals is connected to the input terminal of the thyristor, and the other of the two output terminals is connected to the control terminal and the output terminal of the thyristor.

4. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The control and protection module also includes a current acquisition unit, which is used to acquire the drive circuit current and is connected to the control unit. The current acquisition unit is used to transmit the acquired current to the control unit so that the control unit can determine whether the energy storage circuit current of the energy storage motor is overloaded based on the drive circuit current.

5. The high-voltage circuit breaker energy storage control and protection module according to claim 4, characterized in that, The current acquisition unit includes a current sensor, whose positive and negative input terminals are connected to the input and output terminals of the drive circuit, respectively; the output terminal of the current sensor is connected to the control unit through an RC filter circuit.

6. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The software corresponding to the drive circuit uses a short delay method to eliminate jitter interference.

7. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The switching transistor is a triode.

8. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The alarm unit includes three parallel alarm branches, and each indicator light is used to indicate three states: energy storage in progress, energy storage timeout, and energy storage circuit current overload.

9. The high-voltage circuit breaker energy storage control and protection module according to claim 1, characterized in that, The control unit is a CPU.

10. A high-voltage circuit breaker, characterized in that, Includes the high-voltage circuit breaker energy storage control and protection module as described in any one of claims 1-9.

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