CN218727842U - Instantaneous test circuit of circuit breaker - Google Patents
Instantaneous test circuit of circuit breaker Download PDFInfo
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- CN218727842U CN218727842U CN202222948423.9U CN202222948423U CN218727842U CN 218727842 U CN218727842 U CN 218727842U CN 202222948423 U CN202222948423 U CN 202222948423U CN 218727842 U CN218727842 U CN 218727842U
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Abstract
The application discloses instantaneous test circuit of circuit breaker for the circuit breaker field includes: the loop comprises a magnetic system, a first current receiving device and a second current receiving device, wherein the first current receiving device and the second current receiving device are used for receiving a test current during transient test, and the loop is used for testing the magnetic system. Therefore, the circuit for performing the instantaneous test on the circuit breaker is redesigned, the current is directly transmitted with the magnetic system through the current receiving device to perform the instantaneous test, and the current does not flow through the moving contact in the instantaneous test process, namely the moving contact is not contacted with the fixed contact. Therefore, in the instantaneous test process, the generation of electric arcs is avoided, the contact damage caused by the instantaneous test is avoided, the static contact and the moving contact are protected, and the service life of a product is prolonged.
Description
Technical Field
The application relates to the field of circuit breakers, in particular to an instantaneous test circuit of a circuit breaker.
Background
According to the production standard of the product, before the circuit breakers leave a factory, the magnetic system in each circuit breaker must be tested instantaneously to test the sensitivity of the circuit breaker.
In the prior art, as shown in fig. 1, when a circuit breaker performs an instantaneous test, a current forms a loop through a terminal board a, a moving contact, a fixed contact, a magnetic system and a terminal board B. In the process of instantaneous test, the wiring board A and the wiring board B are conducted after receiving test current, so that the test current flows to the magnetic system through the moving contact and the fixed contact, after the magnetic system receives the test current, a coil in the magnetic system generates a magnetic field, and the magnetic field can enable an iron core in the magnetic system to push the unlocking mechanism to drive the moving contact and the fixed contact to be separated. When the connection of the moving contact and the static contact is separated, an electric arc can be generated between the moving contact and the static contact, the electric arc can burn the moving contact and the static contact seriously, and the temperature rise of the circuit breaker can be caused to be higher.
Therefore, how to protect the contacts without generating arc during the transient test is a key concern for those skilled in the art.
SUMMERY OF THE UTILITY MODEL
Based on the above problem, the present application provides a circuit breaker instantaneous test circuit to realize no arc production when the instantaneous test, and protect the contact.
The embodiment of the application discloses the following technical scheme:
in a first aspect, the loop comprises a magnetic system, a first current receiving device and a second current receiving device, the first current receiving device and the second current receiving device are configured to receive a test current when performing an instantaneous test, and the loop is configured to test the magnetic system.
Optionally, the loop further includes a test device, a first end of the test device is connected to the first end of the first current receiving device, a second end of the test device is connected to the first end of the second current receiving device, and the test device is configured to provide a test current for performing an instantaneous test.
Optionally, the test device comprises a battery.
Optionally, the loop further includes a static contact, a first end of the static contact is connected to the second end of the first current receiving device, a second end of the static contact is connected to the first end of the magnetic system, a second end of the magnetic system is connected to the second end of the second current receiving device, and the static contact is configured to enable the test current to flow to the magnetic system.
Optionally, the fixed contact and the magnetic system are both fixed inside a circuit breaker applying the loop.
Optionally, the circuit breaker further includes a moving contact inside, and in the circuit breaker, the moving contact is separated from the fixed contact.
Optionally, the movable contact is fixed inside a circuit breaker applying the loop.
Optionally, the current receiving device comprises a terminal block.
Compared with the prior art, the method has the following beneficial effects:
the circuit for performing the instantaneous test on the circuit breaker is redesigned, and the current is directly transmitted with the magnetic system through the current receiving device to perform the instantaneous test, so that the current does not flow through the moving contact in the instantaneous test process, namely the moving contact is not contacted with the static contact. Therefore, in the instantaneous test process, the generation of electric arcs is avoided, the contact damage caused by the instantaneous test is avoided, the static contact and the moving contact are protected, and the service life of a product is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of the connection relationship of the instantaneous test circuit of the prior art circuit breaker;
fig. 2 is a schematic connection relationship diagram of an instantaneous test circuit of a circuit breaker according to the present application provided in the embodiment of the present application;
fig. 3 is a schematic current flow diagram of an instantaneous test loop of a circuit breaker according to the present application provided in an embodiment of the present application;
fig. 4 is a schematic current flow diagram of a transient test loop of a prior art circuit breaker.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
It should be noted that, the circuit breaker instantaneous test circuit provided by the present application is used in the field of circuit breakers, and the foregoing is merely an example, and does not limit the application field of the device name provided by the present application.
As described above, in the prior art, as shown in fig. 1, when a circuit breaker performs an instantaneous test, a current forms a loop through a terminal board a, a movable contact, a fixed contact, a magnetic system and a terminal board B. In the process of instantaneous test, the wiring board A and the wiring board B are conducted after receiving test current, so that the test current flows to the magnetic system through the moving contact and the fixed contact, after the magnetic system receives the test current, a coil in the magnetic system generates a magnetic field, and the magnetic field can enable an iron core in the magnetic system to push the unlocking mechanism to drive the moving contact and the fixed contact to be separated, namely the moving contact and the fixed contact are driven to be separated to disconnect the test current. When the connection of the moving contact and the static contact is separated, an electric arc can be generated between the moving contact and the static contact, the electric arc can burn the moving contact and the static contact seriously, and the temperature rise of the circuit breaker can be caused to be higher. It should be noted that the moving contact is connected to the fixed contact after receiving the test current, so that the test current flows to the fixed contact and then flows to the magnetic system. Therefore, how to protect the contact without generating arc during the transient test is a key concern for those skilled in the art.
Therefore, the inventor provides the technical scheme of the application, the circuit for performing the instantaneous test on the circuit breaker is redesigned, the current is directly transmitted with the magnetic system through the current receiving device to perform the instantaneous test, and the current does not flow through the moving contact in the instantaneous test process, namely the moving contact is not contacted with the fixed contact. Therefore, in the instantaneous test process, the generation of electric arcs is avoided, the contact damage caused by the instantaneous test is avoided, the static contact and the moving contact are protected, and the service life of a product is prolonged. After the instant test is finished, the test current is directly cut off by the test equipment for providing the test current for the current receiving device, and the test current is not required to be cut off by driving the moving contact to be separated from the static contact.
The meanings of terms that may be referred to in the present specification are described next.
A circuit breaker: the switching device is a switching device capable of closing, carrying and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a predetermined time.
A breaker contact: the circuit breaker contact is an important part of a circuit breaker, a switch cabinet, an isolating switch and a grounding switch, and the performance of the circuit breaker contact directly influences the quality and the service life of an electric appliance.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic connection relationship diagram of an instantaneous test loop of the circuit breaker according to the present application, provided in an embodiment of the present application, as shown in fig. 2:
the circuit breaker instantaneous test loop comprises a magnetic system, a first current receiving device and a second current receiving device, wherein the first current receiving device and the second current receiving device are used for receiving test current during instantaneous test, and the loop is used for testing the magnetic system in the circuit breaker.
Furthermore, the test loop further comprises a test device, and the first end of the first current receiving device and the first end of the second current receiving device are respectively connected with the test device to receive the test current provided by the test device and enable the test current to be conducted. The following description is made with reference to specific examples. In this example, the test equipment is a battery, the current receiving device is a wiring board, one end of the first wiring board is connected with one end of the battery, the other end of the first wiring board is connected with the fixed contact, one end of the second wiring board is connected with the other end of the battery, and the other end of the second wiring board is connected with the magnetic system.
Furthermore, the test loop further comprises a static contact, and the static contact is used for enabling the test current to flow to the magnetic system. The second end of the first current receiving device is connected with the first end of the static contact, the second end of the static contact is connected with the first end of the magnetic system, and the second end of the magnetic system is connected with the second end of the second current receiving device to form a test loop. And when the instantaneous test is carried out, the moving contact is not contacted with the static contact, so that the current between the static contact and the moving contact is prevented from passing.
In other embodiments, the breaker transient test loop may comprise only the test equipment, the magnetic system, the first current receiving device and the second current receiving device. Specifically, a first end of the test equipment is connected with a first end of a first current receiving device, a second end of the test equipment is connected with a first end of a second current receiving device, a second end of the first current receiving device is connected with a first end of a magnetic system, and a second end of the magnetic system is connected with a second end of the second current receiving device to form an instantaneous test loop for testing the magnetic system.
Furthermore, in the circuit breaker applying the test circuit, the circuit breaker further comprises a moving contact, wherein the moving contact and the fixed contact are in a separated state, and the test circuit is in an arc-free state at the moment. It can be understood that, in the prior art, because the movable contact and the fixed contact are often in a contact (current flowing) state during the transient test, an electric arc can be generated between the movable contact and the fixed contact, which causes serious burn of the movable contact and the fixed contact. Therefore, when the moving contact and the static contact are in a separated state, the instantaneous test loop of the circuit breaker is also in an arc-free state, and contact damage caused by electric arc is avoided. The inventor also finds that the transient test is actually used for testing the electromagnetic system, so that when the transient test is carried out, the test current can be directly applied to the magnetic system in a state of being separated from the static contact, so as to carry out the transient test on the magnetic system.
It should be noted that, in this alternative, the movable contact may also be connected to the first current receiving device and the magnetic system, so as to implement the overall function of the circuit breaker in the use process of the circuit breaker, and in this process, the movable contact may not be in a current flowing state with the fixed contact. Since the moving contacts are not used during the transient test, a detailed description thereof will not be provided.
Specifically, the moving contact can be connected with the magnetic system through the transmission mechanism, and when the magnetic system receives the test current, the transmission mechanism is driven to drive the moving contact to act. When the magnetic system receives the test current, a magnetic field is generated to drive the movable iron core to move, and then the transmission mechanism is driven to drive the movable contact to move. It should be noted that, the connection mode between the moving contact and the magnetic system is the prior art, and is not described herein again.
As an implementation mode, the static contact, the movable contact and the magnetic system are all fixed inside the breaker applying the instantaneous test loop. The current receiving device may include a terminal block, and the current receiving device may also include other devices that can be connected to a power source.
Referring to fig. 3, fig. 3 is a schematic current flow diagram of the instantaneous test loop of the circuit breaker according to the present application, as shown in fig. 3:
the test power supply completes an instantaneous test through a first connection point, a static contact, a magnetic system and a third connection point, wherein the first connection point and the third connection point respectively correspond to the first current receiving device and the second current receiving device in fig. 2. In fig. 3, the test power source only goes through the process from the first connection point to the third connection point, and the test power source does not flow to the movable contact. The process from the first connecting point to the third connecting point is the process that the first connecting point is connected with the fixed contact, the fixed contact is connected with the magnetic system, and then the magnetic system is connected with the third connecting point. In the process, because the static contact is not connected with the moving contact for contact, and no current passes between the static contact and the moving contact, no electric arc is generated between the static contact and the moving contact, and the electric arc can not cause serious burn of the moving contact and the static contact.
In addition, referring to fig. 4, the difference between the present application and the prior art is introduced, and fig. 4 is a schematic current flow diagram of a transient test loop of a circuit breaker according to the prior art, as shown in fig. 4:
the testing power supply completes an instantaneous test through a first connection point, a moving contact, a static contact, a magnetic system and a second connection point, wherein after the testing power supply is received, the moving contact and the static contact are closed to form a current channel so that the testing power supply flows to the magnetic system, and the first connection point and the second connection point respectively correspond to a wiring board A and a wiring board B in the graph 1. In fig. 4, the test power source has traversed the process from the first connection point to the second connection point. The process is that the first connecting point is connected with the moving contact, the moving contact is connected with the static contact, the static contact is connected with the magnetic system, and then the magnetic system is connected with the second connecting point. In the process, after the magnetic system receives the test power supply, the moving contact and the static contact are disconnected, electric arcs can be generated between the moving contact and the static contact, contact breaking points can exist, and then the electric arcs can cause serious burns to the moving contact and the static contact.
Therefore, in the alternative scheme, a circuit for performing instantaneous test on the circuit breaker is redesigned, current is directly transmitted with the magnetic system through the current receiving device to perform the instantaneous test, and the current does not flow through the moving contact in the instantaneous test process, namely the moving contact is not in contact with the fixed contact. Therefore, in the instantaneous test process, the generation of electric arcs is avoided, the contact damage caused by the instantaneous test is avoided, the static contact and the moving contact are protected, and the service life of a product is prolonged.
It should be noted that, in the embodiments of the present application, the names "first" and "second" (if present) in the names "first" and "second" are only used for name identification, and do not represent the sequential first and second.
The circuit breaker instantaneous test circuit provided by the application is described in detail above. The principle and the implementation of the present application are explained herein by using specific examples, and the above descriptions of the embodiments are only used to help understand the utility model of the present application and the core idea thereof. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (8)
1. A circuit breaker transient test circuit, characterized in that the circuit comprises a magnetic system, a first current receiving device and a second current receiving device, the first current receiving device and the second current receiving device are used for receiving a test current when transient testing is performed, and the circuit is used for testing the magnetic system.
2. The circuit breaker transient test circuit of claim 1, further comprising a test device having a first end connected to a first end of said first current receiving device and a second end connected to a first end of said second current receiving device, said test device for providing a test current for transient testing.
3. The circuit breaker transient test circuit of claim 2, wherein said test equipment comprises a battery.
4. The circuit breaker transient test circuit of claim 1, further comprising a stationary contact, wherein a first end of the stationary contact is connected to a second end of the first current receiving device, a second end of the stationary contact is connected to a first end of the magnetic system, a second end of the magnetic system is connected to a second end of the second current receiving device, and the stationary contact is configured to circulate the test current to the magnetic system.
5. The instantaneous circuit breaker test circuit of claim 4, characterized in that said static contact and said magnetic system are fixed inside the circuit breaker to which said circuit is applied.
6. The instantaneous test circuit of claim 5, further comprising a moving contact inside said circuit breaker, wherein said moving contact is separated from said stationary contact in said circuit breaker.
7. The instantaneous test circuit of claim 6, characterized in that said movable contacts are fixed inside the circuit breaker to which said circuit is applied.
8. The circuit breaker transient test circuit of claim 1, wherein the current receiving device comprises a terminal block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222948423.9U CN218727842U (en) | 2022-11-02 | 2022-11-02 | Instantaneous test circuit of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222948423.9U CN218727842U (en) | 2022-11-02 | 2022-11-02 | Instantaneous test circuit of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218727842U true CN218727842U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222948423.9U Active CN218727842U (en) | 2022-11-02 | 2022-11-02 | Instantaneous test circuit of circuit breaker |
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| CN (1) | CN218727842U (en) |
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- 2022-11-02 CN CN202222948423.9U patent/CN218727842U/en active Active
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