Self-charging direct-current circuit breaking device with auxiliary energy consumption capability

Abstract

The invention, which relates to the technical field of the circuit breaker, discloses a self-charging DC circuit breaking apparatus with an auxiliary energy consumption capability, comprising a high-speed mechanical switch HSS, a repulsive force coil L1, a capacitor C, a diode D, an inductor L2, a semi-controlled semiconductor T and an energy consumption branch. When the circuit breaks down and short circuit is formed, the repulsive force coil L1 generates eddy current repulsive force to drive the high-speed mechanical switch HSS to be turned off. Meanwhile, a charging branch formed by connecting a diode D and a capacitor C in parallel automatically charges the capacitor C by using fault current; then the semi-control semiconductor T is triggered to be conducted, so that the capacitor C releases stored energy to generate reverse pulse current, the reverse pulse current and fault current are mutually consumed at a fracture of the switch, and rapid zero-crossing arc extinguishing is achieved; and finally, the residual electric quantity is dissipated in parallel with the auxiliary energy consumption device through the lightning arrester MOV. According to the design, independent pre-charging and an external driving loop are omitted, the structure is compact, the cost is low, and the service life of key elements is prolonged through a complementary energy consumption mechanism.

Description

Technical Field

[0001] This invention relates to the technical field of circuit breakers, and more specifically, to a self-charging DC circuit breaker with auxiliary energy dissipation capability. Background Technology

[0002] With the widespread application of DC power supply systems in power transmission, rail transit, electric vehicle charging stations, and DC microgrids, higher requirements have been placed on the reliability and response speed of circuit breaker protection devices. DC circuit breakers play a crucial role in short-circuit protection in DC power supply systems. However, because DC current lacks a natural zero-crossing point, a continuous arc is easily generated during the breaking process, leading to delayed breaking speed, severe contact damage, and limiting the application of circuit breakers in high-current applications. Common DC circuit breaker protection schemes often achieve arc extinguishing through capacitor shunt, current transfer, or external drive methods. These schemes typically require independent pre-charging circuits or additional energy drive devices. While they can improve zero-crossing transfer efficiency, they also increase structural complexity, size, and cost significantly.

[0003] Furthermore, energy absorption components (such as metal oxide surge arresters, MOVs) age due to long-term thermal and electrical stress during energy dissipation, making it difficult to effectively guarantee their lifespan and reliability under high-frequency interruption conditions. For DC systems requiring high reliability, fast response, and long lifespan, existing technologies struggle to simultaneously meet the demands for simple structure, low cost, and efficient arc extinguishing. Summary of the Invention

[0004] The purpose of this invention is to provide a DC circuit breaker with a simple structure, self-charging capability, and auxiliary energy dissipation device, so as to achieve fast and reliable interruption and extend the service life of energy dissipation components in DC systems without natural zero crossing.

[0005] The technical solution of the present invention is: to provide a self-charging DC circuit breaker with auxiliary energy dissipation capability, the device comprising: a high-speed mechanical switch HSS, a repulsion coil L1, an inductor L2, a capacitor C, a diode D, a semi-controlled semiconductor T, and an energy dissipation branch;

[0006] The repulsion coil L1 and the high-speed mechanical switch HSS are connected in series between two electrical devices A1 and A2 to form the main current branch. The repulsion coil L1 and the high-speed mechanical switch HSS are physically close. After the circuit is short-circuited, the repulsion coil L1 generates eddy currents and repulsion through a huge current, which turns off the high-speed mechanical switch HSS, which is physically close, at the physical level.

[0007] A series-connected diode D and capacitor C are connected in parallel across the repulsion coil L1. The anode of diode D is connected to the electrical device A1, and the cathode is connected to capacitor C. Diode D, capacitor C, and repulsion coil L1 form a capacitor charging branch. When the high-speed mechanical switch HSS is turned off due to a short circuit, part of the fault current flows into capacitor C through diode D, causing it to charge rapidly. The remaining part of the fault current flows to the high-speed mechanical switch HSS, generating a breakdown arc at its break point.

[0008] A capacitor C, an inductor L2, and a semi-controlled semiconductor T are connected in parallel across the high-speed mechanical switch HSS to form a current transfer branch. When a short circuit occurs, the external control unit of the semi-controlled semiconductor T detects the turn-off of the high-speed mechanical switch HSS and sends a turn-on command to the semi-controlled semiconductor T after a preset delay to turn it on. At this time, the capacitor C has stored power in the capacitor charging branch. After the semi-controlled semiconductor T turns on, the capacitor C quickly begins to discharge, generating a reverse pulse current that consumes the fault current at the break point of the high-speed mechanical switch HSS, quickly bringing the fault current at the break point to zero, rapidly eliminating the arc and generating an insulation voltage.

[0009] The energy-consuming branch is connected in parallel across the high-speed mechanical switch HSS to consume the remaining power after the above circuit is short-circuited.

[0010] In any of the above technical solutions, the repulsion coil L1 and the high-speed mechanical switch HSS are further disposed in the same physical structure, which includes: a stationary contact, a moving contact, the repulsion coil L1, a repulsion disk, and a guide rod;

[0011] The stationary and moving contacts are connected to the ends of the conductors in the current loop. Contact between them is considered a closed switch, and separation is considered an open switch. A repulsion coil L1 is connected within the current loop and is fixed in position. A movable repulsion disk is located below it, connected to the moving contact via a guide rod. A spring is fitted around the outside of the guide rod, with one end connected to the guide rod and the other end connected to the structure connected to the stationary contact. When a short circuit occurs, a large current flows through the repulsion coil L1, generating eddy current magnetism that repels the repulsion disk below. The repulsion disk causes the moving contact to quickly disconnect from the stationary contact, completing the high-speed disconnection action. After the fault is cleared, the physical structure returns to its original state under the action of the spring, the moving and stationary contacts reconnect, and the high-speed mechanical switch HSS returns to the conducting state.

[0012] In any of the above technical solutions, the energy-consuming branch further includes: an auxiliary energy-consuming device and a surge arrester (MOV);

[0013] The auxiliary energy dissipation device and the surge arrester (MOV) are connected in series. The surge arrester (MOV) bears the main surge energy, while the auxiliary energy dissipation device shares part of the energy.

[0014] In any of the above technical solutions, the electricity consumed by the energy-consuming branch includes: shunt electricity and residual electricity;

[0015] The shunt power comes from the fault current that did not enter the capacitor charging branch after the circuit short circuit. Part of this fault current enters the main current branch and generates a breakdown arc at the high-speed mechanical switch HSS break point, and the other part enters the energy dissipation branch.

[0016] The remaining charge is the charge remaining after the reverse pulse current generated by the current transfer branch and the fault current at the HSS break point of the high-speed mechanical switch are consumed.

[0017] In any of the above technical solutions, the semi-controlled semiconductor T remains in the off state before receiving the instruction and becomes in the on state after receiving the instruction. After the breakdown arc at the high-speed mechanical switch HSS is canceled out, the current flowing through the semi-controlled semiconductor T returns to zero, and the semi-controlled semiconductor T automatically returns to the off state.

[0018] In any of the above technical solutions, the semi-controlled semiconductor T is further connected to an external control unit, which is also connected to a micro switch located at the high-speed mechanical switch HSS;

[0019] After a short circuit occurs in the circuit, the high-speed mechanical switch HSS is opened. The micro switch at the high-speed mechanical switch HSS detects the displacement of the repulsion disk and sends a detection signal to the control unit in real time indicating that the high-speed mechanical switch HSS has been opened. The control unit starts a programmable timer. After the timer expires, the control unit sends a conduction command to the semi-controlled semiconductor T to control the semi-controlled semiconductor T to conduct.

[0020] The preset timing of the programmable timer in the control unit is determined based on the charging time of capacitor C, ensuring that capacitor C has accumulated sufficient charge in the capacitor charging branch when the timing ends.

[0021] The beneficial effects of this invention are:

[0022] This invention utilizes a self-charging and discharging mechanism formed by capacitor C and diode D connected in parallel in the transfer branch, so that the fault current is automatically diverted and charged by the capacitor at the moment of the tripping action, without the need for an external pre-charging circuit, thus achieving a simple and reliable fast zero-crossing transfer.

[0023] After the current transfer is completed, the high-frequency reverse pulse current generated by the semi-controlled power semiconductor device T can make the mechanical opening current cross zero in a very short time, effectively suppressing the generation of electric arc and extending the contact life.

[0024] The high-speed mechanical switch HSS achieves pure electromagnetic triggering and mechanical break separation without auxiliary drive circuit through the ingenious cooperation of repulsion coil L1 and repulsion disk, shortening the opening time of moving and stationary contacts to the millisecond level, while maintaining zero conduction loss and improving the fast response performance of the circuit breaker.

[0025] The auxiliary energy dissipation device is arranged in parallel with the MOV, which can share the energy at different stages according to the waveform characteristics of the fault current. The MOV mainly absorbs low-frequency high-energy peaks, while the auxiliary energy dissipation device (such as a high-power ceramic resistor or liquid metal current limiter) is responsible for dissipating high-frequency pulse energy, forming a complementary energy dissipation mechanism, which significantly delays the thermal-electric stress aging of the MOV. Attached Figure Description

[0026] The advantages of the above and additional aspects of the present invention will become apparent and readily understood in the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 This is a topology diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention.

[0029] Figure 3 This is a structural diagram of the main current branch of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention.

[0030] Figure 4 This is a physical structure diagram of a high-speed mechanical switch HSS and a repulsion coil L1 of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention.

[0031] Figure 5 This is a structural diagram of the capacitor charging branch of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention;

[0032] Figure 6 This is a current transfer branch structure diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention;

[0033] Figure 7 This is a structural diagram of the energy-consuming branch of a self-charging DC circuit breaker with auxiliary energy-consuming capability according to an embodiment of the present invention.

[0034] Figure 8 This is a topology diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention, wherein the auxiliary energy dissipation device is a high-power resistor.

[0035] Figure 9 This is a topology diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability, according to an embodiment of the present invention, wherein the auxiliary energy dissipation device is a liquid metal current limiter.

[0036] Figure 10 This is a topology diagram of a self-charging DC circuit breaker with auxiliary energy dissipation capability according to an embodiment of the present invention, wherein the auxiliary energy dissipation device is a circuit breaker topology in which a high-power resistor and a liquid metal current limiter are connected in parallel.

[0037] Among them, 1-stationary contact, 2-moving contact, 3-repulsion disk, 4-guide rod, and L1-repulsion coil. Detailed Implementation

[0038] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0039] In the following description, many specific details are set forth in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0040] like Figure 1 and Figure 2 As shown, this embodiment provides a self-charging DC circuit breaker with auxiliary energy dissipation capability. The device is used to connect two electrical devices A1 and A2. The device includes: an auxiliary energy dissipation device, a surge arrester MOV, a high-speed mechanical switch HSS, a repulsion coil L1, an inductor L2, a capacitor C, a diode D, and a semi-controlled semiconductor T.

[0041] like Figure 3 As shown, the repulsion coil L1 and the high-speed mechanical switch HSS are connected in series between the two electrical devices A1 and A2 to form the main current branch. When the main current branch is working normally, the high-speed mechanical switch HSS is closed and remains in the conducting state. The current flows from electrical device A1 through the repulsion coil L1 and the high-speed mechanical switch HSS and then flows out to electrical device A2.

[0042] At the level of real circuits, such as Figure 4As shown, the repulsion coil L1 and the high-speed mechanical switch HSS are housed within the same physical structure. This structure includes: a stationary contact 1, a moving contact 2, the repulsion coil L1, a repulsion disk 3, and a guide rod 4. The stationary contact 1 and the moving contact 2 are respectively connected to the ends of the wires in the current loop. Contact between the two is considered a closed switch, and separation between them is considered an open switch. The repulsion coil L1 is connected within the current loop and its position is fixed. A movable repulsion disk 3 is positioned below it, and the repulsion disk 3 is connected to the moving contact 2 via the guide rod 4. A spring is fitted on the outside, with one end of the spring connected to the guide rod 4 and the other end connected to the structure connected to the stationary contact 1. When a short circuit occurs in the circuit, a large current passes through the repulsion coil L1, generating eddy current magnetism, which generates a repulsive force with the repulsion disk 3 below. The repulsion disk 3 drives the moving contact 2 to quickly disconnect from the stationary contact 1, completing the high-speed disconnection action. When the fault is eliminated (the circuit is no longer short-circuited), the physical structure returns to its original state under the action of the spring, the moving contact 2 and the stationary contact 1 are reconnected, and the high-speed mechanical switch HSS returns to the conducting state.

[0043] like Figure 5 As shown, a diode D and a capacitor C connected in series are connected in parallel across the repulsion coil L1. The anode of diode D is connected to the electrical device A1, and the cathode is connected to the capacitor C. Diode D, capacitor C, and repulsion coil L1 form a capacitor charging branch. When a short circuit occurs, the current flowing through the main current branch rises rapidly. The repulsion coil L1 generates a repulsive force that turns off the high-speed mechanical switch HSS. Simultaneously with the turn-off action, the fault current does not immediately disappear. A portion of the fault current flows through diode D into capacitor C, rapidly charging it. The remaining portion of the fault current still flows to the high-speed mechanical switch HSS, generating a breakdown arc at its break point. Figure 5 The red line at the HSS of the medium- and high-speed mechanical switch indicates the breakdown arc.

[0044] The break point of a high-speed mechanical switch (HSS) can be a vacuum break point, or a gas break point such as nitrogen or air.

[0045] like Figure 6 As shown, the series-connected capacitor C, inductor L2, and semi-controlled semiconductor T are connected in parallel across the high-speed mechanical switch HSS to form a current transfer branch; the semi-controlled semiconductor T is electrically connected to an external control unit, which is also connected to a micro switch located at the high-speed mechanical switch HSS.

[0046] After a short circuit occurs, the high-speed mechanical switch HSS opens. The microswitch at the high-speed mechanical switch HSS detects the displacement of the repulsion disk 3 and sends a detection signal (indicating that the high-speed mechanical switch HSS is open) to the control unit in real time. The control unit starts a programmable timer. After the timer expires, the control unit sends a conduction command to the semi-controlled semiconductor T, controlling the semi-controlled semiconductor T to conduct. At this time, the capacitor C has stored power in the capacitor charging branch. After the semi-controlled semiconductor T conducts, the capacitor C quickly begins to discharge, generating a reverse pulse current that mutually consumes the fault current at the break point of the high-speed mechanical switch HSS, quickly bringing the fault current at the break point to zero, rapidly eliminating the arc and generating an insulation voltage.

[0047] The preset timing of the programmable timer in the control unit is determined based on the charging time of capacitor C, ensuring that capacitor C has accumulated sufficient charge in the capacitor charging branch when the timing ends.

[0048] The semi-controlled semiconductor T remains in the off state before receiving a command and becomes in the on state after receiving a command. The semi-controlled semiconductor T can be a single device or a combination of multiple devices such as GTO and thyristor. In the reset problem (the on semi-controlled semiconductor T returning to the off state), after the breakdown arc at the high-speed mechanical switch HSS is canceled out, the current flowing through the semi-controlled semiconductor T will be cleared to zero, and the GTO and thyristor will automatically return to the off state under zero current.

[0049] like Figure 7 As shown, the series-connected auxiliary energy dissipation device and surge arrester MOV are connected in parallel across the high-speed mechanical switch HSS to form an energy dissipation branch. After the circuit is short-circuited, the fault current that did not enter the capacitor charging branch is diverted. Part of it enters the main current branch and generates a breakdown arc at the break point of the high-speed mechanical switch HSS, while the other part enters the energy dissipation branch and is consumed by the auxiliary energy dissipation device and surge arrester MOV. At the same time, the current transfer branch also consumes the residual charge after the fault current at the break point of the high-speed mechanical switch HSS crosses zero through the energy dissipation branch.

[0050] In the energy dissipation branch, the surge arrester MOV bears the main surge energy, while the auxiliary energy dissipation device shares some of the energy, which can effectively reduce the voltage stress and aging rate of the MOV and extend its service life.

[0051] like Figure 8-10 As shown, the auxiliary energy-consuming device can be a high-power resistor such as a ceramic resistor or a liquid metal current limiter, as well as their parallel combination.

[0052] During the aforementioned operation, the entire protection action relies solely on the fault current to drive the repulsion coil L1, thereby automatically turning off the high-speed mechanical switch HSS, eliminating the need for an independent drive circuit. The self-charging method of capacitor C eliminates the need for a pre-charging circuit; charging C is achieved through the shunting of the fault current, further reducing the device size and lowering costs. The auxiliary energy dissipation device, in conjunction with the surge arrester MOV, absorbs energy, effectively suppressing the short-circuit current rise rate and impact energy, thus improving the circuit breaker's breaking capacity for DC faults and enhancing equipment reliability. This invention's circuit breaker achieves the technical advantages of low cost, fast breaking speed, compact structure, and long service life, meeting the protection requirements of large-capacity DC power systems.

[0053] In summary, this invention proposes a self-charging DC circuit breaker with auxiliary energy dissipation capability, comprising: a high-speed mechanical switch HSS, a repulsion coil L1, an inductor L2, a capacitor C, a diode D, a semi-controlled semiconductor T, and an energy dissipation branch.

[0054] The repulsion coil L1 and the high-speed mechanical switch HSS are connected in series between two electrical devices A1 and A2 to form the main current branch. The repulsion coil L1 and the high-speed mechanical switch HSS are physically close. After the circuit is short-circuited, the repulsion coil L1 generates eddy currents and repulsion through a huge current, which turns off the high-speed mechanical switch HSS, which is physically close, at the physical level.

[0055] A series-connected diode D and capacitor C are connected in parallel across the repulsion coil L1. The anode of diode D is connected to the electrical device A1, and the cathode is connected to capacitor C. Diode D, capacitor C, and repulsion coil L1 form a capacitor charging branch. When the high-speed mechanical switch HSS is turned off due to a short circuit, part of the fault current flows into capacitor C through diode D, causing it to charge rapidly. The remaining fault current flows to the high-speed mechanical switch HSS, generating a breakdown arc at its break point.

[0056] A capacitor C, an inductor L2, and a semi-controlled semiconductor T are connected in parallel across the high-speed mechanical switch HSS, forming a current transfer branch. When a short circuit occurs, the external control unit of the semi-controlled semiconductor T detects the turn-off of the high-speed mechanical switch HSS and sends a turn-on command to the semi-controlled semiconductor T after a preset delay, causing it to turn on. At this time, the capacitor C has already stored power in the capacitor charging branch. After the semi-controlled semiconductor T turns on, the capacitor C quickly begins to discharge, generating a reverse pulse current that interacts with the fault current at the break point of the high-speed mechanical switch HSS, quickly bringing the fault current at the break point to zero, rapidly eliminating the arc and generating an insulation voltage.

[0057] The energy-consuming branch is connected in parallel across the high-speed mechanical switch HSS to consume the remaining power after the above circuit is short-circuited.

[0058] The steps in this invention can be adjusted, combined, or deleted according to actual needs.

[0059] The units in the device of the present invention can be merged, divided, or reduced according to actual needs.

[0060] Although the invention has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of the invention. The scope of protection of the invention is defined by the appended claims and may include various modifications, alterations, and equivalents made to the invention without departing from the scope and spirit of the invention.

Claims

1. A self-charging DC circuit breaker with auxiliary energy dissipation capability, characterized in that, The self-charging DC circuit breaker includes: a high-speed mechanical switch HSS, a repulsion coil L1, an inductor L2, a capacitor C, a diode D, a semi-controlled semiconductor T, and a power-consuming branch. The repulsion coil L1 and the high-speed mechanical switch HSS are connected in series between two electrical devices A1 and A2 to form the main current branch. The repulsion coil L1 and the high-speed mechanical switch HSS are physically close. After the circuit is short-circuited, the repulsion coil L1 generates eddy currents and repulsion through a huge current, which turns off the high-speed mechanical switch HSS, which is physically close, at the physical level. A series-connected diode D and capacitor C are connected in parallel across the repulsion coil L1. The anode of diode D is connected to the electrical device A1, and the cathode is connected to capacitor C. Diode D, capacitor C, and repulsion coil L1 form a capacitor charging branch. When the high-speed mechanical switch HSS is turned off due to a short circuit, part of the fault current flows into capacitor C through diode D, causing it to charge rapidly. The remaining part of the fault current flows to the high-speed mechanical switch HSS, generating a breakdown arc at its break point. A capacitor C, an inductor L2, and a semi-controlled semiconductor T are connected in parallel across the high-speed mechanical switch HSS to form a current transfer branch. When a short circuit occurs, the external control unit of the semi-controlled semiconductor T detects the turn-off of the high-speed mechanical switch HSS and sends a turn-on command to the semi-controlled semiconductor T after a preset delay to turn it on. At this time, the capacitor C has stored power in the capacitor charging branch. After the semi-controlled semiconductor T turns on, the capacitor C quickly begins to discharge, generating a reverse pulse current that consumes the fault current at the break point of the high-speed mechanical switch HSS, quickly bringing the fault current at the break point to zero, rapidly eliminating the arc and generating an insulation voltage. The energy-consuming branch is connected in parallel across the high-speed mechanical switch HSS to consume the remaining power after the above circuit is short-circuited.

2. The self-charging DC circuit breaker with auxiliary energy dissipation capability as described in claim 1, characterized in that, The repulsion coil L1 and the high-speed mechanical switch HSS are housed in the same physical structure, which includes: a stationary contact (1), a moving contact (2), the repulsion coil L1, a repulsion disk (3), and a guide rod (4). The stationary contact (1) and the moving contact (2) are respectively connected to the ends of the wires in the current loop. When they are in contact, it is considered that the switch is closed, and when they are separated, it is considered that the switch is open. The repulsion coil L1 is connected in the current loop. The position of the repulsion coil L1 is fixed. A movable repulsion disk (3) is set below it. The repulsion disk (3) is connected to the moving contact (2) through the guide rod (4). A spring is sleeved on the outside of the guide rod (4). One end of the spring is connected to the guide rod (4), and the other end is connected to the structure connected to the stationary contact (1). When a short circuit occurs in the circuit, a large current passes through the repulsion coil L1 to generate eddy current magnetism, which generates repulsion with the repulsion disk (3) below. The repulsion disk (3) drives the moving contact (2) to quickly disconnect from the stationary contact (1) and complete the high-speed disconnection action. When the fault is eliminated, the physical structure returns to its original state under the action of the spring. The moving contact (2) and the stationary contact (1) are reconnected, and the high-speed mechanical switch HSS returns to the conducting state.

3. The self-charging DC circuit breaker with auxiliary energy dissipation capability as described in claim 1, characterized in that, The energy-consuming branch includes: an auxiliary energy-consuming device and a surge arrester (MOV); The auxiliary energy dissipation device and the surge arrester (MOV) are connected in series. The surge arrester (MOV) bears the main surge energy, while the auxiliary energy dissipation device shares part of the energy.

4. The self-charging DC circuit breaker with auxiliary energy dissipation capability as described in claim 1, characterized in that, The power consumed by the energy-consuming branch includes: shunt power and residual power; The shunt power comes from the fault current that did not enter the capacitor charging branch after the circuit short circuit. Part of this fault current enters the main current branch and generates a breakdown arc at the high-speed mechanical switch HSS break point, and the other part enters the energy dissipation branch. The remaining charge is the charge remaining after the reverse pulse current generated by the current transfer branch and the fault current at the HSS break point of the high-speed mechanical switch are consumed.

5. The self-charging DC circuit breaker with auxiliary energy dissipation capability as described in claim 1, characterized in that, The semi-controlled semiconductor T remains in the off state before receiving the instruction and becomes in the on state after receiving the instruction. After the breakdown arc at the high-speed mechanical switch HSS is canceled out, the current flowing through the semi-controlled semiconductor T returns to zero, and the semi-controlled semiconductor T automatically returns to the off state.

6. The self-charging DC circuit breaker with auxiliary energy dissipation capability as described in claim 2, characterized in that, The semi-controlled semiconductor T is electrically connected to an external control unit, which is also connected to a micro switch located at the high-speed mechanical switch HSS; After a short circuit occurs in the circuit, the high-speed mechanical switch HSS is disconnected. The micro switch at the high-speed mechanical switch HSS detects that the repulsion disk (3) has been displaced and sends a detection signal to the control unit in real time indicating that the high-speed mechanical switch HSS has been disconnected. The control unit starts a programmable timer. After the timer expires, the control unit sends a conduction command to the semi-controlled semiconductor T to control the semi-controlled semiconductor T to conduct. The preset timing of the programmable timer in the control unit is determined based on the charging time of capacitor C, ensuring that capacitor C has accumulated sufficient charge in the capacitor charging branch when the timing ends.

Images