CN217902936U - Hybrid circuit breaker - Google Patents
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- CN217902936U CN217902936U CN202222298785.8U CN202222298785U CN217902936U CN 217902936 U CN217902936 U CN 217902936U CN 202222298785 U CN202222298785 U CN 202222298785U CN 217902936 U CN217902936 U CN 217902936U
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Abstract
The utility model discloses a hybrid circuit breaker. The hybrid circuit breaker comprises a mechanical switch connected between a power supply and a load and a current transfer branch connected with the mechanical switch in parallel, wherein the current transfer branch comprises a controllable semiconductor power device for controlling the on-off of the current transfer branch; the hybrid circuit breaker further includes first and second energy absorption circuits; the first energy absorbing circuit is used for inhibiting high voltage generated when the controllable semiconductor power device is turned off; the second energy absorption circuit is a one-way conduction circuit and is used for absorbing energy stored in the load in the process of disconnecting the power supply and the load; the conduction voltage threshold of the first energy absorption circuit is larger than the maximum voltage of the power supply, the conduction voltage threshold of the second energy absorption circuit is smaller than the conduction voltage threshold of the first energy absorption circuit, and the difference value of the conduction voltage threshold and the conduction voltage threshold is larger than the maximum voltage of the power supply. Compared with the prior art, the utility model discloses still can not influence the breaking time of circuit breaker when having improved circuit breaker security.
Description
Technical Field
The utility model belongs to the technical field of the low pressure electricity, concretely relates to hybrid circuit breaker.
Background
In a power supply system, a circuit breaker is used as a protection device, and the application is very common. At present, most direct current circuit breakers are mechanical circuit breakers, and have the advantages of high reliability, strong short-time overload capacity, small volume, low price and the like. There are generally two types of circuit breaker arc extinguishing methods: one is conventional opening and closing, the electric arc is axially pulled open by utilizing a contact, meanwhile, a conductive loop generates a magnetic field, the electric arc is bent and stretched, the electric arc is elongated along the direction vertical to the arc axis, the length of the electric arc is increased, the electric arc also generates transverse motion, and the arc extinguishing effect is achieved by air cooling; the other is that the electric arc is drawn into the arc extinguishing cover by magnetic force under the influence of self-electrodynamic force or the magnetic field of the magnetic blow coil so as to be quickly extinguished. The arc extinguishing mode can generate strong electric arc when in breaking and can seriously burn the contact, thereby greatly reducing the service life of the circuit breaker.
In order to solve the breaking problem, based on the development of semiconductor devices, a solid-state circuit breaker composed of pure semiconductor power devices and a hybrid circuit breaker composed of a combination of a mechanical switch and a semiconductor power device have appeared. In solid-state circuit breakers and hybrid circuit breakers, the breaking of the current is mainly dependent on semiconductor power devices. The semiconductor power device has the advantages of extremely high breaking speed and no electric arc generated in the breaking process. However, since the breaking speed of the semiconductor power device is too fast, the current change in the circuit is very severe in the breaking process, and the stray inductance in the circuit can generate very high peak voltage at two ends of the semiconductor power device, which can far exceed the safe operating voltage of the semiconductor power device, an energy absorption circuit needs to be added at two ends of the semiconductor power device to protect the safety of the device. The energy absorption circuit has the functions of limiting current and blocking current cutoff besides inhibiting absorption of overvoltage. Theoretically, by means of the energy absorption circuit, the semiconductor power device can safely realize the current breaking. In practice, however, there are a wide variety of loads, particularly those that contain a large inductance. When a short circuit occurs, a large amount of electric energy is stored in the part of the inductive load, and the part of the electric energy is absorbed by the energy absorption circuit after the semiconductor power device is turned off, which results in that: (1) The part of electric energy is very large and may exceed the voltage-limiting absorption capacity of the energy absorption circuit, so that the safety of the semiconductor power device is influenced; (2) The dissipation of large energy in the load takes a long time, which can prolong the breaking time of the circuit breaker.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough, provide a hybrid circuit breaker, utilize an energy-absorbing circuit to restrain the high voltage that controllable semiconductor power device in the current transfer branch road produced when turn-offs, utilize another energy-absorbing circuit to carry out from the afterflow dissipation to the great energy of storage in the load, still can not influence the breaking time of circuit breaker when having improved the circuit breaker security.
The utility model discloses specifically adopt following technical scheme to solve above-mentioned technical problem:
a hybrid circuit breaker comprises a mechanical switch connected between a power supply and a load and a current transfer branch connected with the mechanical switch in parallel, wherein the current transfer branch comprises a controllable semiconductor power device for controlling the on-off of the current transfer branch; the hybrid circuit breaker further includes a first energy absorption circuit and a second energy absorption circuit; the first energy absorption circuit is used for inhibiting high voltage generated by the controllable semiconductor power device when the controllable semiconductor power device is turned off; the second energy absorption circuit is a one-way conduction circuit and is used for absorbing energy stored in the load in the process of disconnecting the power supply and the load; the conducting voltage threshold of the first energy absorption circuit is larger than the maximum voltage of the power supply, the conducting voltage threshold of the second energy absorption circuit is smaller than the conducting voltage threshold of the first energy absorption circuit, and the difference value of the conducting voltage threshold and the conducting voltage threshold is larger than the maximum voltage of the power supply.
As a preferred solution, the hybrid circuit breaker is a dc circuit breaker having a positive input end, a positive output end and a negative input/output end shared by input and output; the current transfer branch comprises a bridge circuit and the controllable semiconductor power device, two alternating current ends of the bridge circuit are respectively connected with a positive input end and a positive output end of the hybrid circuit breaker, and the controllable semiconductor power device is connected between two direct current ends of the bridge circuit; the first energy absorption circuit is a first energy absorption device connected with the controllable semiconductor power device in parallel; the second energy absorption circuit is a second energy absorption device, one end of the second energy absorption device is connected with the negative input and output end of the hybrid circuit breaker, and the other end of the second energy absorption device is connected with the direct current negative end of the bridge circuit.
As a second preferred solution, the hybrid circuit breaker is a dc circuit breaker having a positive input end, a positive output end, and a negative input/output end shared by input and output; the current transfer branch is composed of the controllable semiconductor power device connected with the mechanical switch in parallel; the first energy absorption circuit is a first energy absorption device connected with the controllable semiconductor power device in parallel; the second energy-absorbing circuit is a series circuit formed by connecting a second energy-absorbing device and a diode in series, the series circuit is connected between the positive output end and the negative input and output end of the hybrid circuit breaker, and the conduction direction of the diode points to the positive output end of the hybrid circuit breaker from the negative input and output end of the hybrid circuit breaker.
As a third preferred solution, the hybrid circuit breaker is an ac circuit breaker; the current transfer branch comprises a bridge circuit and the controllable semiconductor power device, two alternating current ends of the bridge circuit are respectively connected with two ends of the mechanical switch, and the controllable semiconductor power device is connected between two direct current ends of the bridge circuit; the first energy absorbing circuit is a first energy absorbing device connected with the controllable semiconductor power device in parallel; the second energy-absorbing circuit is composed of a semi-controlled rectifier bridge and a second energy-absorbing device, two input ends of the semi-controlled rectifier bridge are respectively connected with two ends of a load, and two ends of the second energy-absorbing device are respectively connected with two output ends of the semi-controlled rectifier bridge.
Preferably, the first and/or second energy absorber means are one or a combination of a plurality of the following energy absorber elements: MOV composed of piezoresistor and zinc oxide valve plate, and lightning arrester.
Preferably, the controllable semiconductor power device is any one of the following devices: IGBT, thyristor, GTO.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses turn off the energy dissipation of production with the semiconductor power device in the current transfer branch road and divide into two independent processes with the great energy dissipation of load storage, set up two independent energy-absorbing circuit and handle these two processes respectively, because the energy that the semiconductor power device in the current transfer branch road turn-offs the production is less relatively, energy-absorbing circuit rather than corresponding can be with this partial energy absorption in very short time, realize that the quick branch of circuit breaker divides absolutely, and the great energy of storage then carries out from the afterflow dissipation through another energy-absorbing circuit in the load, still can not influence the breaking time of circuit breaker when having improved circuit breaker security.
Drawings
Fig. 1 is a schematic circuit diagram according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit structure according to a third embodiment of the present invention.
Detailed Description
The dissipation problem to the produced electric energy of prior art be difficult to the efficient handling inductive load not enough, the utility model discloses a solution thinking is that the energy dissipation that the semiconductor power device in the current transfer branch road turn-offs the production divide into two independent processes with the great energy dissipation of load storage, set up two independent energy-absorbing circuit and handle these two processes respectively, because the energy that the semiconductor power device in the current transfer branch road turn-offs the production is less relatively, the energy-absorbing circuit who corresponds rather than can be in very short time with this part energy absorption, realize that the quick branch of circuit breaker is disconnected, and the great energy of storage then carries out from the afterflow dissipation through another energy-absorbing circuit in the load, still can not influence the breaking time of circuit breaker when having improved circuit breaker security.
The utility model discloses specifically adopt following technical scheme to solve above-mentioned technical problem:
a hybrid circuit breaker comprises a mechanical switch connected between a power supply and a load and a current transfer branch connected with the mechanical switch in parallel, wherein the current transfer branch comprises a controllable semiconductor power device for controlling the on-off of the current transfer branch; the hybrid circuit breaker further includes a first energy-absorbing circuit and a second energy-absorbing circuit; the first energy absorption circuit is used for inhibiting high voltage generated by the controllable semiconductor power device when the controllable semiconductor power device is turned off; the second energy absorption circuit is a one-way conduction circuit and is used for absorbing energy stored in the load in the process of disconnecting the power supply and the load; the conducting voltage threshold of the first energy absorption circuit is larger than the maximum voltage of the power supply, the conducting voltage threshold of the second energy absorption circuit is smaller than the conducting voltage threshold of the first energy absorption circuit, and the difference value of the conducting voltage threshold and the conducting voltage threshold is larger than the maximum voltage of the power supply.
The utility model discloses technical scheme both has been applicable to direct current circuit breaker, also is applicable to alternating current circuit breaker.
For the public understanding, the technical solution of the present invention is further described in detail by the following embodiments in combination with the attached drawings:
example 1:
fig. 1 shows the basic circuit structure and principle of embodiment 1 of the hybrid circuit breaker of the present invention, which is a dc circuit breaker; in the figure, CK is a mechanical fracture of the mechanical switch; the current sensor CT samples the current flowing through the mechanical fracture in real time, and records the current as i m (ii) a S1, S2, S3 and S4 are diodes, and form a bridge circuit by adopting a connection mode in the figure, so that bidirectional breaking is realized; s0 is an IGBT, connected between two direct current ends of the bridge circuit and used for transferring and breaking the current of the main loop; the bridge circuit and the IGBT S0 form a current transfer branch. The hybrid circuit breaker comprises terminals D1, D2, D3 and D4, wherein the terminal D1 is connected with the positive input end P1 of the hybrid circuit breaker, and the terminal D2 is connected with the positive output end of the hybrid circuit breakerThe output end P2 is connected; the terminal D3 is connected with one end of the energy absorbing device M1, and the terminal D4 is connected with the other end of the energy absorbing device M1, so that the energy absorbing device M1 is connected with the two ends of the S0 in parallel; in the embodiment, the energy absorber M1 forms an energy absorber circuit 1 for absorbing overvoltage when S0 is turned off; the input and output shared load input and output end P3 is connected with a load and a power supply load; the energy absorption circuit 2 in the embodiment is composed of an energy absorption device M2, one end of the energy absorption circuit is connected with a wiring terminal D4, and the other end of the energy absorption circuit is connected with a negative input and output end P3; the energy absorption circuit 2 is used for self-current-follow dissipation of the stored energy of the inductive load in the breaking process of the hybrid circuit breaker. Conduction voltage threshold u of energy absorption circuit 1 1f And the on-state voltage threshold u of the energy absorption circuit 2 2f Maximum voltage U of power supply p (voltage peak in ac environment) is configured to satisfy the following condition: u. u 1f >U p ，u 1f –u 2f >U p 。
The concrete working principle of the hybrid circuit breaker is as follows:
1) When the system works normally, CK is switched on, S0 is switched off, and a power supply supplies power to a load through CK;
2) And when the current is disconnected, the S0 is controlled to be conducted, the current in the CK is transferred to the current transfer branch circuit along with the separation of the mechanical fracture CK, and the power supply supplies power to the load through the S1, the S0 and the S4. In the process, the voltage U at the two ends of M1 34 ＜u 1f And M1 is in an off state.
3) After the current of the main loop is completely transferred to the current transfer branch, the arc between CK is extinguished, and the separation distance of the mechanical fracture meets the condition of cut-off recovery strength, S0 is controlled to be turned off; at the moment of S0 turn-off, the potential of the D2 point is rapidly reduced, and the voltage at two ends of the load is rapidly increased and limited to u by M2 2f (ii) a The energy stored in the load is self-dissipated via M2, S4.
4) At the same time, the stray inductance on the line will generate a high voltage across S0, which is limited by M1 to u 1f Due to u 1f –u 2f >U dc When the high voltage generated at the two ends of the S0 is absorbed by the M1 quickly, the M1 is restored to the cut-off state immediately, and therefore the disconnection between the power supply and the load is achieved.
5) Step 3), step 4) occur simultaneously, but when step 4) is completed, energy may still be dissipated in step 3), but the power source has been disconnected from the load; therefore, the energy absorption circuit 2 accelerates the breaking speed of the power supply and the load.
Example 2:
fig. 2 shows the basic circuit structure and principle of embodiment 2 of the hybrid circuit breaker of the present invention, which is a dc circuit breaker; CK in the figure is a mechanical fracture of the mechanical switch; the current sensor CT samples the current flowing through the mechanical fracture in real time, and the current is recorded as i m (ii) a S0 is an IGBT, and a current transfer branch is separately formed in this embodiment, for transferring and breaking the main loop current. The hybrid circuit breaker comprises terminals D1, D2, D3 and D4, wherein the terminal D1 is connected with a positive input end P1 of the hybrid circuit breaker, and the terminal D2 is connected with a positive output end P2 of the hybrid circuit breaker; the terminal D3 is connected with one end of the energy absorber M1, and the terminal D4 is connected with the other end of the energy absorber M1, so that the energy absorber M1 is connected with the two ends of the S0 in parallel; the energy absorption device M1 forms an energy absorption circuit 1 and is used for overvoltage absorption when the S0 is turned off; the input and output shared load input and output end P3 is connected with a load and a power supply load; the energy absorption circuit 2 in this embodiment is formed by connecting an energy absorption device M2 and a diode S1 in series, a cathode of the diode is connected with a positive output end P2 of the hybrid circuit breaker, an anode of the diode is connected with one end of the energy absorption device M2, and the other end of the energy absorption device M2 is connected with a negative input and output end P3 of the hybrid circuit breaker. Conduction voltage threshold u of energy absorption circuit 1 1f And the on-state voltage threshold u of the energy absorption circuit 2 2f Maximum voltage U of power supply p (voltage peak in ac environment) is configured to satisfy the following condition: u. of 1f >U p ，u 1f –u 2f >U p 。
The concrete working principle of the hybrid circuit breaker is as follows:
1) When the system works normally, CK is switched on, S0 is switched off, and a power supply supplies power to a load through CK;
2) When the current is disconnected, the S0 is controlled to be conducted, the current in the CK is transferred to the current transfer branch circuit along with the separation of the mechanical fracture CK, and the power supply passes through the current transfer branch circuitSupplying power to a load through S0; in the process, the voltage U at the two ends of M1 34 ＜u 1f And M1 is in an off state.
3) When the current of the main loop is completely transferred to the current transfer branch, the arc between CK is extinguished, and the separation distance of the mechanical fracture meets the condition of cut-off recovery strength, S0 is controlled to be turned off; at the moment of S0 turning off, the potential at the point D2 is rapidly reduced, the voltage at two ends of the load is rapidly increased and is limited to u by M2 2f The energy stored in the load is self-dissipated via M2, S1.
4) At the same time, the stray inductance on the line will generate a high voltage across S0, which is limited by M1 to u 1f (ii) a Due to u 1f –u 2f >U dc When the high voltage generated at the two ends of the S0 is absorbed by the M1 quickly, the M1 is restored to the cut-off state immediately, and therefore the disconnection between the power supply and the load is achieved.
5) Step 3) and step 4) occur simultaneously, but when step 4) is completed, energy in step 3) may still be dissipated by self, but the power supply is disconnected from the load at the moment, so that the energy absorption circuit 2 accelerates the breaking speed of the power supply and the load.
Example 3:
fig. 3 shows the basic circuit structure and principle of embodiment 3 of the hybrid circuit breaker of the present invention, which is an ac circuit breaker; CK in the figure is a mechanical fracture of the mechanical switch; the current sensor CT samples the current flowing through the mechanical fracture in real time, and the current is recorded as i m (ii) a S1, S2, S3 and S4 are diodes, and form a bridge circuit by adopting a connection mode in the figure, and are used for realizing bidirectional breaking; s0 is an IGBT, connected between two direct current ends of the bridge circuit and used for transferring and breaking the current of the main loop; the bridge circuit and the IGBT S0 form a current transfer branch. The hybrid circuit breaker includes terminals D1, D2, D3 and D4, which are connected as shown in fig. 3; in the embodiment, the energy absorption device M1 forms an energy absorption circuit 1 and is used for overvoltage absorption when the S0 is turned off; the energy absorption circuit 2 in this embodiment is composed of a half-controlled rectifier bridge (T1, T2 are thyristors) and an energy absorption device M2, two input ends of the half-controlled rectifier bridge are respectively connected to two ends of a load, and two ends of the energy absorption device M2 are respectively connected to two output ends of the half-controlled rectifier bridge. Energy-absorbing electricityAnd the circuit 2 is used for self-follow current dissipation of the stored energy of the inductive load in the breaking process of the hybrid circuit breaker. Conduction voltage threshold u of energy absorption circuit 1 1f And the on-state voltage threshold u of the energy absorption circuit 2 2f Maximum value of voltage U of power supply p (voltage peak in ac environment) is configured to satisfy the following condition: u. of 1f >U p ，u 1f –u 2f >U p 。
The concrete working principle of the hybrid circuit breaker is as follows:
1) When the system works normally, CK is switched on, S0 is switched off, and a power supply supplies power to a load through CK;
2) When the current is disconnected, the S0 is controlled to be conducted, the current in the CK is transferred to the current transfer branch circuit along with the separation of the mechanical fracture CK, and the power supply supplies power to the load through the S1, the S0 and the S4; in the process, the voltage U at the two ends of M1 34 ＜u 1f And M1 is in an off state.
3) After the current of the main loop is completely transferred to the current transfer branch, the arc between CK is extinguished, and after the separation distance of the mechanical fracture meets the condition of cut-off recovery strength, S0 is controlled to be turned off, and T1 and T2 are controlled to be turned on; after the T1 and the T2 are conducted for a short time, the T1 and the T2 are controlled to be turned off; at the moment of S0 turn-off, the potential of the D2 point is rapidly reduced, the voltage at two ends of the load is rapidly increased, and the voltage is limited to u by M2 after passing through the semi-controlled rectifier bridge 2f The energy stored in the load is self-dissipated via the half-controlled rectifier bridge, S4.
4) At the same time, the on-line stray inductance will generate a high voltage across the semiconductor power device S0, which will be limited by M1 to u 1f (ii) a Due to u 1f –u 2f >U inMax (U inMax Is the maximum peak voltage of the power supply), when the high voltage generated at the two ends of the S0 is quickly absorbed by the M1, the M1 is immediately restored to the cut-off state, thereby realizing the disconnection between the power supply and the load.
5) Step 3), step 4) occur simultaneously, but when step 4) is completed, energy may still be dissipating in step 3), but the power supply has already been disconnected from the load. Therefore, the energy absorption circuit 2 accelerates the breaking speed of the power supply and the load.
6) When the power supply is disconnected with the load, the thyristors T1 and T2 are automatically cut off after the energy stored in the load is consumed.
In the above embodiments, the energy absorbing device M1 and the energy absorbing device M2 may adopt one or a plurality of combinations of the following energy absorbing elements: MOV composed of piezoresistor and zinc oxide valve plate, and lightning arrester. The IGBT S0 may also employ other types of controllable semiconductor power devices, such as thyristors, GTOs.
After the scheme is adopted, because the energy generated by the turn-off of the controllable semiconductor power device S0 is relatively small, the energy absorption circuit 1 can absorb the part of energy in a short time, and the quick breaking of the circuit breaker is realized; and the larger energy stored in the load is dissipated by the energy absorption circuit 2 in a self-follow current mode, so that the breaking time of the circuit breaker cannot be influenced. In addition, as the working voltage threshold of the energy absorption circuit 2 is lower than that of the energy absorption circuit 1, lower-voltage energy consumption devices can be selected, and the cost can be reduced; meanwhile, after the large inductive energy of the load is dissipated through the energy absorption circuit 2, the pressure of the energy absorption circuit 1 can be greatly reduced, and the safety of the controllable semiconductor power device in the current transfer branch is improved.
Claims (8)
1. A hybrid circuit breaker comprises a mechanical switch connected between a power supply and a load and a current transfer branch connected with the mechanical switch in parallel, wherein the current transfer branch comprises a controllable semiconductor power device for controlling the on-off of the current transfer branch; the hybrid circuit breaker is characterized by further comprising a first energy absorption circuit and a second energy absorption circuit; the first energy absorbing circuit is used for inhibiting high voltage generated when the controllable semiconductor power device is turned off; the second energy absorption circuit is a one-way conduction circuit and is used for absorbing energy stored in the load in the process of disconnecting the power supply and the load; the conduction voltage threshold of the first energy absorption circuit is larger than the maximum voltage of the power supply, the conduction voltage threshold of the second energy absorption circuit is smaller than the conduction voltage threshold of the first energy absorption circuit, and the difference value of the conduction voltage threshold and the conduction voltage threshold is larger than the maximum voltage of the power supply.
2. A hybrid circuit breaker as recited in claim 1, wherein said hybrid circuit breaker is a dc circuit breaker having a positive input terminal, a positive output terminal, and a negative input-output terminal common to both input and output; the current transfer branch comprises a bridge circuit and the controllable semiconductor power device, two alternating current ends of the bridge circuit are respectively connected with a positive input end and a positive output end of the hybrid circuit breaker, and the controllable semiconductor power device is connected between two direct current ends of the bridge circuit; the first energy absorption circuit is a first energy absorption device connected with the controllable semiconductor power device in parallel; the second energy absorption circuit is a second energy absorption device, one end of the second energy absorption device is connected with the negative input and output end of the hybrid circuit breaker, and the other end of the second energy absorption device is connected with the direct current negative end of the bridge circuit.
3. A hybrid circuit breaker as claimed in claim 2, characterized in that the first and/or second energy absorber means are one or a combination of a plurality of the following energy absorber elements: MOV composed of piezoresistor and zinc oxide valve plate, and lightning arrester.
4. A hybrid circuit breaker as recited in claim 1, wherein said hybrid circuit breaker is a dc circuit breaker having a positive input terminal, a positive output terminal, and a negative input-output terminal common to both input and output; the current transfer branch is composed of the controllable semiconductor power device connected with the mechanical switch in parallel; the first energy absorption circuit is a first energy absorption device connected with the controllable semiconductor power device in parallel; the second energy-absorbing circuit is a series circuit formed by connecting a second energy-absorbing device and a diode in series, the series circuit is connected between the positive output end and the negative input and output end of the hybrid circuit breaker, and the conduction direction of the diode points to the positive output end of the hybrid circuit breaker from the negative input and output end of the hybrid circuit breaker.
5. A hybrid circuit breaker as claimed in claim 4, characterized in that the first and/or second energy absorber means are one or a combination of a plurality of the following energy absorber elements: MOV composed of piezoresistor and zinc oxide valve plate, and lightning arrester.
6. A hybrid circuit breaker as recited in claim 1, wherein said hybrid circuit breaker is an ac circuit breaker; the current transfer branch comprises a bridge circuit and the controllable semiconductor power device, two alternating current ends of the bridge circuit are respectively connected with two ends of the mechanical switch, and the controllable semiconductor power device is connected between two direct current ends of the bridge circuit; the first energy absorption circuit is a first energy absorption device connected with the controllable semiconductor power device in parallel; the second energy absorption circuit is composed of a half-controlled rectifier bridge and a second energy absorption device, two input ends of the half-controlled rectifier bridge are respectively connected with two ends of the load, and two ends of the second energy absorption device are respectively connected with two output ends of the half-controlled rectifier bridge.
7. A hybrid circuit breaker as claimed in claim 6, characterized in that the first and/or second energy absorber means are one or a combination of a plurality of the following energy absorber elements: MOV composed of piezoresistor and zinc oxide valve plate, and lightning arrester.
8. Hybrid circuit breaker according to claim 1, characterized in that the controllable semiconductor power device is any one of the following devices: IGBT, thyristor, GTO.
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| CN202222298785.8U CN217902936U (en) | 2022-08-31 | 2022-08-31 | Hybrid circuit breaker |
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| CN202222298785.8U CN217902936U (en) | 2022-08-31 | 2022-08-31 | Hybrid circuit breaker |
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| CN217902936U true CN217902936U (en) | 2022-11-25 |
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