CN113299525A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
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- CN113299525A CN113299525A CN202110463312.6A CN202110463312A CN113299525A CN 113299525 A CN113299525 A CN 113299525A CN 202110463312 A CN202110463312 A CN 202110463312A CN 113299525 A CN113299525 A CN 113299525A
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- 230000007246 mechanism Effects 0.000 claims abstract description 115
- 239000003990 capacitor Substances 0.000 claims description 42
- 238000004146 energy storage Methods 0.000 claims description 39
- 230000005540 biological transmission Effects 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
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Abstract
The application relates to a circuit breaker comprising: a protection device, an operating mechanism and a fixed contact; the operating mechanism comprises a movable contact; the first end of the protection device is connected with one end of the movable contact of the operating mechanism, and the second end of the protection device is movably contacted with one end of the operating mechanism, which is far away from the movable contact; one end of a movable contact of the operating mechanism is movably contacted with the fixed contact; the protection device is used for absorbing energy generated by short-circuit impact current flowing from the first end of the protection device when a short-circuit fault occurs in a protected circuit, and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy; the open state indicates that the circuit breaker is in a tripped state. Therefore, the protection device is used for absorbing the short-circuit impact current, the energy generated by the short-circuit impact current is used for controlling the operating mechanism, and the tripping of the circuit breaker is completed, so that the connection between the protected circuit and the fault circuit is cut off, and the safe and reliable operation of the power supply system is ensured.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a circuit breaker.
Background
The low-voltage circuit breaker is an electric appliance which not only has the function of manual switch, but also can automatically carry out voltage loss, undervoltage, overload and short-circuit protection. The low-voltage circuit breaker can be connected with a protected circuit in series and used for protecting a power supply circuit, a motor and the like in the protected circuit, and when the protected circuit has serious faults of overload, short circuit, undervoltage and the like, the low-voltage circuit breaker can automatically cut off the protected circuit.
However, in the low-voltage dc power supply system, since there are relatively many capacitors in the protected circuit, for example: and a filter capacitor. When the protected circuit has a short-circuit fault, the capacitor discharges quickly to generate a large short-circuit impact current, the energy of the short-circuit impact current is dissipated too quickly, and a breaker of the protected circuit cannot trip quickly, so that a fault line cannot be cut off quickly.
Disclosure of Invention
In view of the above, it is desirable to provide a circuit breaker capable of quickly breaking a faulty line when a short-circuit fault occurs in a protected circuit.
In a first aspect, an embodiment of the present application provides a circuit breaker, including: a protection device, an operating mechanism and a fixed contact; the operating mechanism comprises a movable contact;
the first end of the protection device is connected with one end of a movable contact of the operating mechanism, and the second end of the protection device is movably contacted with one end of the operating mechanism, which is far away from the movable contact; one end of a movable contact of the operating mechanism is movably contacted with the fixed contact;
the protection device is used for absorbing energy generated by short-circuit impact current flowing from the first end of the protection device when a short-circuit fault occurs in a protected circuit, and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy; the open state indicates that the circuit breaker is in a tripped state.
In one embodiment, the protection device comprises: the current transformer, the energy storage capacitor and the first release are arranged on the circuit board; the primary side of the current transformer is connected with one end of a movable contact of the operating mechanism; the secondary side of the current transformer is connected with an energy storage capacitor in parallel; the first pole of the energy storage capacitor is connected with the first end of the first release; the second pole of the energy storage capacitor is connected with the second end of the first release;
the current transformer is used for converting the short-circuit impact current flowing from the primary side to the secondary side to generate induction current when the protected circuit has short-circuit fault;
the energy storage capacitor is used for absorbing the induced current generated by the secondary side to charge the energy storage capacitor and providing current for the first release through discharging;
and the first tripper is used for controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to energy generated by current provided by the energy storage capacitor.
In one embodiment, the protection device further comprises a diode; the diode is connected between the secondary side of the current transformer and the energy storage capacitor;
and the diode is used for preventing the induced current generated by the secondary side flowing into the energy storage capacitor from flowing backwards.
In one embodiment, the first release is a first electromagnet;
the first electromagnet is used for generating electromagnetic force according to current provided by the energy storage capacitor, and the movable contact and the fixed contact of the operating mechanism are controlled to be switched from a closed state to an open state through the electromagnetic force.
In one embodiment, the protection device further comprises a second release; one end of the second tripper is connected with the primary side of the current transformer; the other end of the second tripper is connected with the protected circuit;
and the second release is used for generating energy according to the residual short circuit impact current after passing through the primary side of the current transformer and controlling the movable contact and the fixed contact of the operating mechanism to be switched from the closed state to the open state according to the energy.
In one embodiment, the second release is a second electromagnet;
and the second electromagnet is used for generating electromagnetic force according to the residual impact current after passing through the primary side of the current transformer and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state.
In one embodiment, the operating mechanism comprises a transmission mechanism and a free tripping mechanism; the transmission mechanism is connected with any part on the free tripping mechanism, and the transmission mechanism is arranged between the free tripping mechanism and the protection device; the free tripping mechanism comprises the moving contact;
the transmission mechanism is used for pushing the free tripping mechanism to be switched from a locking state to a tripping state under the control of the protection device; and when the locking state is switched to the tripping state, the movable contact and the fixed contact of the free tripping mechanism are switched to the disconnection state from the closing state.
In one embodiment, the trip free mechanism further comprises a first spring member, a chain member, and a hook member; the first spring component is connected with one end of the chain component, and the movable contact is arranged at the connection position of the first spring component and the chain component;
the hook component is in a locking state when connected with the other end of the chain component and is in a releasing state when disconnected;
the first spring component is used for rebounding the chain component when the lock is in the tripping state, and the movable contact and the fixed contact are switched from the closing state to the opening state.
In one embodiment, the circuit breaker further comprises a housing, an end of the first spring member remote from the chain member is fixed to the housing, and an end of the hook member remote from the chain member is fixed to the housing.
In one embodiment, the actuator includes an armature lever and a second spring member; the upper part of the first end of the armature lever is connected with the free tripping mechanism, the lower part of the first end of the armature lever is connected with the second spring component, and the second end of the armature lever is close to the protection device and is in movable contact with the protection device;
the armature lever is used for contacting the second end of the armature lever with the protection device under the control of the protection device, and transmitting a pushing force to the first end through the second end to pull the second spring component to push the free tripping mechanism upwards, so that the free tripping mechanism is switched from a locking state to a tripping state.
The application provides a circuit breaker, this circuit breaker includes: a protection device, an operating mechanism and a fixed contact; the operating mechanism comprises a movable contact; the first end of the protection device is connected with one end of the movable contact of the operating mechanism, and the second end of the protection device is movably contacted with one end of the operating mechanism, which is far away from the movable contact; one end of a movable contact of the operating mechanism is movably contacted with the fixed contact; the protection device is used for absorbing energy generated by short-circuit impact current flowing from the first end of the protection device when a short-circuit fault occurs in a protected circuit, and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy; the open state indicates that the circuit breaker is in a tripped state. Therefore, the protection device is used for absorbing the short-circuit impact current, the energy generated by the short-circuit impact current is used for controlling the operating mechanism, the movable contact and the fixed contact of the operating mechanism are switched to be in an open state from a closed state, the tripping of the circuit breaker is completed, the connection between the protected circuit and the fault circuit is cut off, and therefore when the short-circuit impact current is generated, the fault circuit can be cut off quickly, and the safe and reliable operation of a power supply system is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a circuit breaker in a closing state according to an embodiment;
fig. 2 is a schematic structural diagram of a circuit breaker in a trip state according to an embodiment;
fig. 3 is a schematic structural diagram of another circuit breaker provided by an embodiment;
fig. 4 is a schematic structural diagram of another circuit breaker provided by an embodiment;
fig. 5 is a schematic structural diagram of another circuit breaker according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described below are intended to be illustrative of the circuit breakers provided herein and are not intended to be limiting.
The numbering of the components as such, for example "first", "second", etc., in this application is used solely to distinguish between the objects depicted and not to imply any order or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the positional words, such as "upper", "lower", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature. In the present application, the difference in name is not used as a means for distinguishing elements, but the difference in function of elements is used as a principle of distinction.
Before explaining the circuit breaker provided by the present application, an application scenario of the embodiment of the present application is introduced.
A circuit breaker is a switching device capable of closing, loading and opening a current under a condition where a circuit is abnormal. In a dc power supply system, for safe and reliable operation of the power supply system, a circuit breaker is usually installed in a power supply line, and the circuit breaker is used to quickly trip through the circuit breaker when a fault occurs, so as to break the connection between the fault line and the protected circuit, thereby avoiding the expansion of the fault range.
In addition, as a common protection switch, the circuit breaker is also commonly used in a household power system. In the household power supply, a circuit breaker is generally used as a main power protection switch or a branch line protection switch, and if a short circuit or an overload occurs to a line or a household appliance, the circuit breaker can automatically trip to cut off the power supply, so that the household appliance and other lines are effectively protected from being damaged, and the accident risk is reduced to the minimum range.
Of course, the above-mentioned fast fault line disconnection in a dc power supply system or a household power system through a circuit breaker is only an example application scenario of the present application, and the present application may also be applied in other scenarios with a protected circuit, which is not listed here.
Fig. 1 is a schematic structural diagram of a circuit breaker in a closing state according to an embodiment of the present application, where the circuit breaker 100 includes a protection device 101, an operating mechanism 102, and a fixed contact 103, and the operating mechanism 102 includes a moving contact 1021. A first end of the protection device 101 is connected to one end of the moving contact 1021 of the operating mechanism 102, a second end of the protection device 101 is in movable contact with one end of the operating mechanism far from the moving contact 1021, and one end of the moving contact 1021 of the operating mechanism 102 is in movable contact with the fixed contact 103. When a short-circuit fault occurs in the protected circuit, the protection device 101 is configured to absorb energy generated by a short-circuit impact current flowing from a first end of the protection device 101, and to control the movable contact 1021 and the fixed contact 103 of the operating mechanism 102 to switch from a closed state to an open state according to the energy, where the open state indicates that the circuit breaker 100 is in a trip state.
Note that, after the short circuit occurs, a short-circuit current is always generated in the circuit, and when the short circuit occurs after about half a cycle (when f is 50Hz, this time is about 0.01 second), the short-circuit current (including the cycle component and the dc component) reaches a maximum value, that is, a short-circuit rush current. Wherein, the short-circuit current can pass through two states after appearing: short transient processes and short steady state processes. In the short circuit transient process, the change rate of the short circuit impact current is large, and the short circuit impact current tends to be stable along with the attenuation of the non-periodic short circuit current, namely, the short circuit transient process is started.
In practical application, if the breaker connected in the circuit can quickly cut off a fault circuit within the action time of short-circuit impact current, the short-circuit current is prevented from flowing into a protected circuit, and the effect of protecting the circuit and reducing the influence range of the short-circuit current can be achieved through switching on and tripping off of the breaker.
In order to achieve the effect, the breaker provided by the application adopts the protection device to absorb energy generated by short circuit impact current, and controls the movable contact and the fixed contact of the operating mechanism to be disconnected according to the energy, so that the breaker is switched to a tripping state.
Referring to fig. 1, in a possible implementation manner, the circuit breaker is connected in series in a circuit and is respectively connected to the protected circuit module and the power module, and the power module may be replaced by another circuit module, which is not limited in this embodiment of the present application. When the circuit normally operates, the circuit breaker is in a closing state, at the moment, the movable contact and the fixed contact are in a closing state, current flows out of the power supply module and flows to the protected circuit module through the circuit breaker, and electronic elements in the protected circuit module normally work.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first circuit breaker in a trip state according to an embodiment of the present application, and assuming that the circuit breaker is connected in series with a circuit module a and a circuit module B, the present application does not limit the specific circuits of the circuit module a and the circuit module B and the arrangement of electronic components therein.
In a possible implementation manner, under normal conditions, current in the circuit flows out of the circuit module a and flows to the circuit module B through the circuit breaker, but when a short-circuit fault occurs on a line in the circuit module a, short-circuit impact current flowing out of the circuit module a flows into the protection device, the protection device quickly absorbs the short-circuit impact current, and the operation mechanism is controlled according to energy generated by the short-circuit impact current, so that the movable contact and the fixed contact of the operation mechanism are disconnected, and the circuit breaker is in a trip state. After the circuit breaker trips, the connection between the circuit module A and the circuit module B is interrupted, and the short-circuit current flowing out of the circuit module A cannot flow into the circuit module B any more, so that the purpose of protecting the circuit module B is achieved, and the effect of reducing the influence range of the short-circuit current is achieved.
In an embodiment of the present application, the circuit breaker includes: a protection device, an operating mechanism and a fixed contact; the operating mechanism comprises a movable contact; the first end of the protection device is connected with one end of the movable contact of the operating mechanism, and the second end of the protection device is movably contacted with one end of the operating mechanism, which is far away from the movable contact; one end of a movable contact of the operating mechanism is movably contacted with the fixed contact; the protection device is used for absorbing energy generated by short-circuit impact current flowing from the first end of the protection device when a short-circuit fault occurs in a protected circuit, and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy; the open state indicates that the circuit breaker is in a tripped state. Therefore, the protection device is used for absorbing the short-circuit impact current, the energy generated by the short-circuit impact current is used for controlling the operating mechanism, the movable contact and the fixed contact of the operating mechanism are switched to be in an open state from a closed state, the tripping of the circuit breaker is completed, the connection between the protected circuit and the fault circuit is cut off, and therefore when the short-circuit impact current is generated, the fault circuit can be cut off quickly, and the safe and reliable operation of a power supply system is guaranteed.
Based on the circuit breakers shown in fig. 1 and fig. 2, the embodiment of the present application further provides a schematic structural diagram of another circuit breaker, see fig. 3.
As shown in fig. 3, the protection device 101 in the circuit breaker 100 further includes: the primary side of the current transformer is connected with one end of a movable contact of the operating mechanism 102; the secondary side of the current transformer is connected with an energy storage capacitor in parallel; the first pole of the energy storage capacitor is connected with the first end of the first release; and the second pole of the energy storage capacitor is connected with the second end of the first release.
The current transformer is used for converting short-circuit impact current flowing from a primary side to a secondary side to generate induction current when a protected circuit has a short-circuit fault; the energy storage capacitor is used for absorbing the induced current generated at the secondary side to charge the energy storage capacitor and providing current for the first release through discharging; the first release is used for controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to energy generated by current provided by the energy storage capacitor.
It should be noted that the current transformer is an instrument for realizing current transformation based on the electromagnetic induction principle, and is composed of a closed iron core and a winding, and is connected in series in a current line. For example, the current transformer may proportionally flow a large current on the primary side to a small current on the secondary side, or proportionally convert a small current on the primary side to a large current on the secondary side. Compared with energy storage elements such as batteries and the like, the capacitor can be instantly charged and discharged, the charging and discharging current is basically not limited, and high-power instant pulse current can be provided for electronic elements connected with the capacitor.
In this embodiment, since the short-circuit impact current has a high change rate, the short-circuit impact current flowing into the current transformer through the primary coil can generate an induced current on the secondary side of the current transformer under the action of electromagnetic induction, and the generated induced current charges the energy storage capacitor. In addition, because the energy storage capacitor has the functions of charging and discharging, when the energy storage capacitor is connected between the current transformer and the first tripper as an energy storage element, the current can be provided for the first tripper through discharging.
Therefore, the current transformer and the energy storage capacitor are additionally arranged on the line through which the short-circuit impact current flows, so that the energy generated by the short-circuit impact current can be absorbed and stored in time, and the energy can effectively act on the first release. The short-circuit impact current is prevented from short acting time and energy dissipation is too fast, so that the first release controls the operating mechanism to act for a long time, and further the short-circuit device cannot rapidly cut off a fault circuit.
Optionally, in order to further reduce the short-circuit inrush current loss, the protection device 101 further includes a diode on the basis of the protection device 101 shown in fig. 3.
The diode is connected between the secondary side of the current transformer and the energy storage capacitor and used for controlling induced current generated on the secondary side of the current transformer to flow into the energy storage capacitor in a single direction and charge the energy storage capacitor so as to prevent the induced current flowing into the energy storage capacitor from flowing backwards.
As an example, in the protection device 101 shown in fig. 3, the first release is a first electromagnet, and a coil is wound on the first electromagnet, and the number of turns of the coil is not limited in the embodiment of the present application and may be set according to requirements in a specific implementation environment.
Specifically, the first electromagnet can generate electromagnetic force according to the current provided by the energy storage capacitor, and the electromagnetic force of the electromagnet can control the movable contact and the fixed contact of the operating mechanism to be switched from the closed state to the open state.
Based on the circuit breaker shown in fig. 3, the embodiment of the present application further provides a schematic structural diagram of another circuit breaker, see fig. 4.
As shown in fig. 4, in order to shorten the trip time of the circuit breaker 100 to rapidly break the fault circuit in the event of a short-circuit fault, the protection device 101 in the circuit breaker 100 further includes a second release. One end of the second tripper is connected with the primary side of the current transformer; the other end of the second tripper is connected with a protected circuit. The second tripper is used for generating energy according to the residual short circuit impact current after passing through the primary side of the current transformer and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy.
Optionally, the second trip is a second electromagnet. The second electromagnet is used for generating electromagnetic force according to residual impact current after passing through the primary side of the current transformer.
In summary, when a short circuit occurs, a short circuit rush current passes through a current transformer and a second release in the protection device. Due to the high rate of change of the short-circuit rush current, a large amount of energy can be rapidly accumulated after passing through the current transformer and the energy storage capacitor, and the energy is used for increasing the electromagnetic force of the first electromagnet. In addition, since one end of the second trip is connected with the primary side of the current transformer, a part of short-circuit current also flows to the second electromagnet, so that the electromagnetic force of the second electromagnet is increased. Therefore, under the combined action of the first electromagnet and the second electromagnet, the movable contact and the fixed contact of the operating mechanism can be rapidly controlled to be switched to the off state, the tripping of the circuit breaker is promoted, and a fault circuit is cut off.
Based on the circuit breaker shown in fig. 3 or fig. 4, the embodiment of the present application further provides a schematic structural diagram of another circuit breaker, see fig. 5.
As shown in fig. 5, the operating mechanism 102 of the circuit breaker 100 includes a transmission mechanism 1022 and a free trip mechanism 1023, the transmission mechanism 1022 is connected to any portion of the free trip mechanism 1023, the transmission mechanism 1022 is disposed between the free trip mechanism 1023 and the protection device 101, and the free trip mechanism 1023 includes a moving contact. The transmission mechanism 1022 is configured to push the free tripping mechanism 1023 to switch from a latched state to a tripped state under the control of the protection device 102, and when the latched state is switched to the tripped state, the moving contact and the fixed contact of the free tripping machine 1023 are switched from a closed state to an open state.
It should be noted that the transmission mechanism is a lever device, and is disposed between the free tripping mechanism and the protection device, when the free tripping mechanism is in the locking state, the transmission mechanism is in the balanced state, and when the energy of the protection device is increased and can act on the transmission mechanism, the protection device can push the free tripping mechanism to switch to the tripping state through the transmission mechanism.
To allow the trip-free mechanism to flexibly switch states, in one possible implementation, the trip-free mechanism 1023 further includes a first spring member, a chain member, and a hook member. The first spring component is connected with one end of the chain component, and the movable contact is arranged at the connection position of the first spring component and the chain component; the hook component is in a locking state when connected with the other end of the chain component and is in a releasing state when disconnected; when the first spring component is in a tripping state, the first spring component rebounds to the chain component, and the movable contact and the fixed contact are switched from a closing state to an opening state.
In practical use, the circuit breaker 100 further comprises a housing, and when the above-mentioned components are specifically integrated into the circuit breaker, an end of the first spring member remote from the chain member is fixed to the housing of the circuit breaker 100, and an end of the hook member remote from the chain member is fixed to the housing of the circuit breaker 100.
Further, in one possible implementation, the transmission mechanism 1022 includes an armature lever and a second spring member; the free tripping mechanism 1023 is connected to the upper part of the first end of the armature lever, the second spring part is connected to the lower part of the first end of the armature lever, and the second end of the armature lever is close to the protection device 101 and is in movable contact with the protection device 101; under the control of the protection device 101, the second end of the armature lever is in contact with the protection device 101; when the second end of the armature lever contacts the protection device 101, the second end of the armature lever transmits the pushing force to the first end, and the second spring member is pulled to push the free tripping mechanism 1023 upwards, so that the free tripping mechanism 1023 is switched from the locking state to the tripping state.
In the application, when a short-circuit fault occurs in a circuit, the protection device can absorb short-circuit impact current generated by the short circuit through the current transformer and the energy storage capacitor, provide current for the first tripper and the second tripper by using energy generated by the short-circuit impact current, and increase electromagnetic force of the first tripper and the second tripper. Under the combined action of the first tripper and the second tripper, the free tripping mechanism can quickly trip, so that the circuit breaker trips to cut off the connection between the protected circuit and the fault circuit. Therefore, the short-circuit impact current is absorbed through the protection device, tripping is completed by using energy generated by the short-circuit impact current, a fault line can be quickly cut off when the short-circuit impact current is generated, and safe and reliable operation of a power supply system is ensured.
It should be understood that various features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but rather, should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A circuit breaker, characterized in that the circuit breaker comprises: a protection device, an operating mechanism and a fixed contact; the operating mechanism comprises a movable contact;
the first end of the protection device is connected with one end of a movable contact of the operating mechanism, and the second end of the protection device is movably contacted with one end of the operating mechanism, which is far away from the movable contact; one end of a movable contact of the operating mechanism is movably contacted with the fixed contact;
the protection device is used for absorbing energy generated by short-circuit impact current flowing from the first end of the protection device when a short-circuit fault occurs in a protected circuit, and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to the energy; the open state indicates that the circuit breaker is in a tripped state.
2. The circuit breaker of claim 1, wherein the protection device comprises: the current transformer, the energy storage capacitor and the first release are arranged on the circuit board; the primary side of the current transformer is connected with one end of a movable contact of the operating mechanism; the secondary side of the current transformer is connected with an energy storage capacitor in parallel; the first pole of the energy storage capacitor is connected with the first end of the first release; the second pole of the energy storage capacitor is connected with the second end of the first release;
the current transformer is used for converting the short-circuit impact current flowing from the primary side to the secondary side to generate induction current when the protected circuit has short-circuit fault;
the energy storage capacitor is used for absorbing the induced current generated by the secondary side to charge the energy storage capacitor and providing current for the first release through discharging;
and the first tripper is used for controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state according to energy generated by current provided by the energy storage capacitor.
3. The circuit breaker of claim 2, wherein the protection device further comprises a diode; the diode is connected between the secondary side of the current transformer and the energy storage capacitor;
and the diode is used for preventing the induced current generated by the secondary side flowing into the energy storage capacitor from flowing backwards.
4. The circuit breaker of claim 2 or 3, wherein the first trip is a first electromagnet;
the first electromagnet is used for generating electromagnetic force according to current provided by the energy storage capacitor, and the movable contact and the fixed contact of the operating mechanism are controlled to be switched from a closed state to an open state through the electromagnetic force.
5. The circuit breaker of claim 2 or 3, wherein the protection device further comprises a second trip; one end of the second tripper is connected with the primary side of the current transformer; the other end of the second tripper is connected with the protected circuit;
and the second release is used for generating energy according to the residual short circuit impact current after passing through the primary side of the current transformer and controlling the movable contact and the fixed contact of the operating mechanism to be switched from the closed state to the open state according to the energy.
6. The circuit breaker of claim 5, wherein said second trip is a second electromagnet;
and the second electromagnet is used for generating electromagnetic force according to the residual impact current after passing through the primary side of the current transformer and controlling the movable contact and the fixed contact of the operating mechanism to be switched from a closed state to an open state.
7. The circuit breaker of any of claims 1-3, wherein the operating mechanism comprises a transmission mechanism and a trip free mechanism; the transmission mechanism is connected with any part on the free tripping mechanism, and the transmission mechanism is arranged between the free tripping mechanism and the protection device; the free tripping mechanism comprises the moving contact;
the transmission mechanism is used for pushing the free tripping mechanism to be switched from a locking state to a tripping state under the control of the protection device; and when the locking state is switched to the tripping state, the movable contact and the fixed contact of the free tripping mechanism are switched to the disconnection state from the closing state.
8. The circuit breaker of claim 7, wherein said trip free mechanism further comprises a first spring member, a chain member, a hook member; the first spring component is connected with one end of the chain component, and the movable contact is arranged at the connection position of the first spring component and the chain component;
the hook component is in a locking state when connected with the other end of the chain component and is in a releasing state when disconnected;
the first spring component is used for rebounding the chain component when the lock is in the tripping state, and the movable contact and the fixed contact are switched from the closing state to the opening state.
9. The circuit breaker of claim 8, further comprising a housing, wherein an end of the first spring member distal from the chain member is secured to the housing, and wherein an end of the hook member distal from the chain member is secured to the housing.
10. The circuit breaker of claim 7, wherein the transmission mechanism includes an armature lever and a second spring member; the upper part of the first end of the armature lever is connected with the free tripping mechanism, the lower part of the first end of the armature lever is connected with the second spring component, and the second end of the armature lever is close to the protection device and is in movable contact with the protection device;
the armature lever is used for contacting the second end of the armature lever with the protection device under the control of the protection device, and transmitting a pushing force to the first end through the second end to pull the second spring component to push the free tripping mechanism upwards, so that the free tripping mechanism is switched from a locking state to a tripping state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110463312.6A CN113299525A (en) | 2021-04-23 | 2021-04-23 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110463312.6A CN113299525A (en) | 2021-04-23 | 2021-04-23 | Circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN113299525A true CN113299525A (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110463312.6A Pending CN113299525A (en) | 2021-04-23 | 2021-04-23 | Circuit breaker |
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| CN (1) | CN113299525A (en) |
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| US4229775A (en) * | 1979-02-09 | 1980-10-21 | Westinghouse Electric Corp. | Circuit breaker magnetic trip device with time delay |
| EP0762590A1 (en) * | 1995-08-31 | 1997-03-12 | Siemens Aktiengesellschaft | Line circuit breaker |
| EP0899846A2 (en) * | 1997-08-29 | 1999-03-03 | Siemens Aktiengesellschaft | Actuating circuit for a tripping magnet of a circuit breaker |
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Application publication date: 20210824 |