CN111799139A - Circuit breaker and control method thereof - Google Patents

Abstract

The invention discloses a circuit breaker, which comprises a movable contact 1, a movable contact spring 2, a connecting rod 3, a movable contact spring 4, a movable contact 5, a fixed contact 6, a fixed contact 7, a fixed contact 8 and a fixed contact 9, and is characterized in that: the bottom surface of the movable contact 1 and the bottom surface of the movable contact 5 are provided with a height difference h; there is the arc extinguishing circuit between movable contact and the stationary contact and another parallel movable contact and the stationary contact of the same structure that parallels, through above-mentioned design, can realize that switch J1, J2 have disconnection and closure of time sequence, and cooperation arc extinguishing circuit has realized the energy in the circuit and has not damaged the recovery, plays fine arc extinguishing effect, has guaranteed the physical isolation in the circuit, has increased product life.

Description

Circuit breaker and control method thereof

Technical Field

The invention relates to a circuit breaker, in particular to a circuit breaker capable of extinguishing arc.

Background

The circuit breaker 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 prescribed time. However, when the power supply is switched on and off by direct current power supply, the load in the circuit can generate induced current which is equivalent to an inductor, when the circuit breaker is switched off, because the current of the inductor cannot change suddenly, the accumulated energy cannot be released, and only air can be punctured at the contact of the circuit breaker to generate electric arc and release energy.

The existing arc extinguishing modes mainly comprise two modes, namely a physical arc extinguishing method and an electronic arc extinguishing method. The first physical arc extinguishing method, as the scheme of the invention in China entitled electromagnetic contactor (with publication number of CN104737264A), is an electromagnetic contactor, which improves the circuit breaking performance by shortening the arc residence time, and is realized by arranging a sealed arc extinguishing chamber and increasing the area of the end face of a contact. Fig. 1 is a structural diagram of a conventional electromagnetic contactor, in which the following numbers are illustrated in the drawings:

10 electromagnetic contactor

100 contact device

101 contact mechanism

102 arc extinguishing chamber

105 fixed contact supporting insulating substrate

111. 112 fixed contact

115C-shaped part

118 fixed contact part

118a contact part

118b chamfer shape

118c contact end side end face

121 insulating cover

122L-shaped plate part

122a upper cover part (opposite face)

122b side cover part

130 movable contact part

130a contact part

130b chamfer shape

130c end face on the contact end side

132 movable contact

141 magnet storage bag

143 arc extinguishing permanent magnet

145 arc extinguishing space

The advantage of this scheme is that the switch can the physics disconnection, realizes the physical isolation function. Of course, there are other physical arc-extinguishing methods, such as quenching arc by gas or oil, vacuum arc-extinguishing, multi-break arc-extinguishing and metal arc-extinguishing grid arc-extinguishing, which only can reduce the arc and cannot solve the problem fundamentally, as long as there is arc, the contact will be ablated, and the service life of the circuit breaker will be reduced. Meanwhile, the existence of the electric arc also easily causes personal electric shock accidents and even electrical fire, and brings great hidden danger to personal and property safety.

The second is an electronic arc extinguishing method, namely an invention scheme (with the publication number being CN107332222A) named as 'a DC switch arc extinguishing device suitable for high power', a Chinese invention scheme (with the application number being CN201521075698) named as 'a socket with an arc extinguishing device and a matched plug thereof specially used for DC', and the like. The electronic arc extinguishing scheme has the advantages that the current of the inductor in the circuit can be fed back to the input end through the follow current loop of the arc extinguishing circuit arranged in the circuit breaker, the energy in the circuit can be fully released, the circuit breaker does not generate electric arc when being disconnected, but the electronic arc extinguishing method has no physical isolation effect, the switch is electrically connected when being disconnected, reverse leakage current exists when the switch is disconnected, the electronic arc extinguishing scheme is limited by the voltage-resistant grade of an electronic element, and the high voltage cannot be borne.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a circuit breaker, which can realize physical isolation, withstand high voltage, and realize electronic arc extinction.

The improved conception of the invention is that through the design of the clamping circuit, two pairs of switch groups in the arc extinguishing circuit are switched on and off according to time sequence, and the circuit breaker does not generate electric arc when being switched on and switched off, thereby not only realizing physical isolation and bearing high voltage, but also realizing electronic arc extinguishing and prolonging the service life of the product.

In order to achieve the above object, the present invention provides the following technical solutions:

a circuit breaker comprises an arc extinguishing device, wherein the arc extinguishing device comprises an arc extinguishing circuit and a mechanical operating mechanism linked with the arc extinguishing circuit, the mechanical operating mechanism comprises a fixed contact and a movable contact, the movable contact comprises a first movable contact and a second movable contact, the actions of the first movable contact and the second movable contact are asynchronous, the first movable contact is used for connecting a weak current loop, and the second movable contact is used for connecting a strong current loop; the arc extinguishing circuit comprises a switch J1, a switch J2, a switch J3, a switch J4, a diode D1 and a diode D3, wherein one end of the switch J3 is connected with an input positive end, the other end of the switch J3 is connected with one end of the switch J4, and the other end of the switch J4 is connected with an output positive end; one end of the switch J1 is connected with the input negative terminal, the other end of the switch J1 is connected with one end of the switch J2, and the other end of the switch J2 is connected with the output negative terminal; the anode of the diode D1 is connected with the other end of the switch J1 and one end of the switch J2 respectively, and the cathode of the diode D1 is connected with the positive input end; the anode of the diode D2 is connected to the negative input terminal and one end of the switch J1, respectively, and the cathode of the diode D2 is connected to the other end of the switch J3 and one end of the switch J4, respectively; the switch J1 and the switch J3 form a first pair of switch groups which act synchronously and are used for being connected with the first movable contact, and the switch J2 and the switch J4 form a second pair of switch groups which act synchronously and are used for being connected with the second movable contact; when the circuit breaker is closed, the second movable contact is closed firstly to realize the first closing of the second pair of switch groups; then the first movable contact is closed to realize the rear closing of the first pair of switch groups; when the circuit breaker is disconnected, the first movable contact is disconnected firstly, so that the first pair of switch groups is disconnected firstly; the second movable contact is then opened to effect a back-off of the second pair of switch sets.

The invention also provides a circuit breaker, which comprises a mechanical operating mechanism linked with an arc extinguishing circuit, wherein the mechanical operating mechanism comprises a first movable contact (1), a first movable contact spring (2), a connecting rod (3), a second movable contact spring (4), a second movable contact (5) and fixed contacts (6, 7, 8 and 9), the first movable contact (1) and the second movable contact (5) of the mechanical operating mechanism are symmetrically arranged in a parallel and parallel mode along the longitudinal axis of the connecting rod, and the distance between the bottom surface of the first movable contact (1) and the fixed contacts is greater than that between the second movable contact (5) and the fixed contacts, wherein the actions of the first movable contact (1) and the second movable contact (5) are asynchronous, the first movable contact (1) is used for connecting a weak electric loop, and the second movable contact (5) is used for connecting a strong electric loop; when the circuit breaker is closed, the connecting rod (3) moves downwards, and the bottom surface of the second movable contact (5) is firstly contacted with the fixed contacts (6, 7) so as to realize the first closing of the second pair of switch groups; when the connecting rod (3) continues to move downwards again, the second movable contact (5) continues to be kept in contact with the fixed contacts (6, 7) under the action of the second movable contact spring (4), and the bottom surface of the first movable contact (1) is in contact with the fixed contacts (8, 9) so as to realize the rear closing of the first pair of switch sets; when the circuit breaker is disconnected, the connecting rod (3) moves upwards, the bottom surface of the first movable contact (1) is separated from the fixed contacts (8 and 9), and the second movable contact (5) is kept in contact with the fixed contacts (6 and 7) under the action of the second movable contact spring (4) so as to realize the prior disconnection of the first pair of switch sets; when the connecting rod (3) continues to move upwards again, the bottom surface of the second movable contact (5) is separated from the fixed contacts (6, 7) so as to realize the rear disconnection of the second pair of switch groups.

The invention further provides a circuit breaker, which comprises a mechanical operating mechanism linked with an arc extinguishing circuit, wherein the mechanical operating mechanism comprises a first movable contact (1), a second movable contact (5), a fixed contact (6) and a connecting frame, the first movable contact (1), the second movable contact (5) and the fixed contact (6) of the mechanical operating mechanism are arranged in parallel in a longitudinal parallel mode perpendicular to the connecting frame, the actions of the first movable contact (1) and the second movable contact (5) are asynchronous, the first movable contact (1) is used for connecting a weak current circuit, and the second movable contact (5) is used for connecting a strong current circuit; when the circuit breaker is closed, under the action of an external force applied to the fixed contact, the second movable contact (5) moves and closes to the first movable contact (1) so as to realize the prior closing of the second pair of switch groups; continuously applying external force, the second movable contact (5) and the first movable contact (1) are closed together to move and close towards the fixed contact (6) so as to realize the rear closing of the first pair of switch groups; when the circuit breaker is disconnected, external force is released, the first movable contact (1) and the fixed contact (6) are separated firstly, and the second movable contact (5) and the first movable contact (1) are kept closed so as to realize the first disconnection of the first pair of switch groups; then, the external force is continuously released, and the second movable contact (5) is separated from the first movable contact (1) to realize the back disconnection of the second pair of switch groups.

The invention further provides a control method of the circuit breaker, which realizes the closing/opening control of two pairs of switch groups of an arc extinguishing circuit in the circuit breaker by carrying out the closing/opening control of contacts through two movable contacts of a mechanical operating mechanism in the circuit breaker according to a set time sequence, and the method comprises the following steps: the actions of two movable contacts of a mechanical operating mechanism in the circuit breaker are asynchronous; the first movable contact is connected with the first pair of switch groups and used for connecting a weak current loop; the second movable contact is connected with the second pair of switch groups and used for connecting a strong current circuit; the closing action time sequence of the circuit breaker is that the second movable contact and the fixed contact are closed firstly, so as to realize the first closing of the second pair of switch groups; then the first movable contact and the fixed contact are closed to realize the rear closing of the first pair of switch groups; the circuit breaker is in a breaking action time sequence, namely, the first movable contact and the fixed contact are firstly broken to realize the first breaking of the first pair of switch groups; and then the second movable contact is disconnected with the fixed contact to realize the rear disconnection of the second pair of switch groups.

The invention further provides a control method of the circuit breaker, which realizes the closing/opening control of two pairs of switch groups of an arc extinguishing circuit in the circuit breaker by carrying out the closing/opening control of contacts through two movable contacts of a mechanical operating mechanism in the circuit breaker according to a set time sequence, and the method comprises the following steps: two pairs of switch groups of an arc extinguishing circuit in the circuit breaker are asynchronous; the first pair of switch groups is connected with the first movable contact and used for connecting a weak current loop; the second pair of switch groups is connected with the second movable contact and used for connecting a strong current circuit; the closing control time sequence of the circuit breaker is that the second pair of switch groups is closed first, and the first pair of switch groups is closed after a set time period; the opening control sequence of the circuit breaker is that the first pair of switch groups is opened first, and the second pair of switch groups is opened after a set time interval.

According to the circuit breaker, because the current of the inductor cannot suddenly change in the direct current circuit, when the circuit breaker is disconnected, J1(J3) is disconnected firstly, the switch J2(J4) is still in a connection and conduction state, follow current formed in the circuit is fed back to the direct current circuit through the arc extinguishing circuit, energy stored in the inductor coil in the load is recovered in a lossless mode when the contactor is disconnected, and the switch J2(J4) is disconnected to achieve 0-voltage turn-off and achieve a physical isolation effect. When the breaker is closed, the switch J2(J4) is firstly closed and conducted, the switch J1(J3) is then closed and conducted, the switch J2(J4) realizes 0-current conduction, the arc extinguishing function is realized, and the service life of a product is prolonged.

Drawings

Fig. 1 is a structural view of an electromagnetic contactor according to a conventional physical arc extinguishing method;

FIG. 2 is a schematic circuit diagram of a conventional electronic arc-extinguishing method for a high-power DC switch arc-extinguishing device;

fig. 3 is a structural diagram of a dc dedicated socket with an arc extinguishing device and a mating plug thereof according to the conventional electronic arc extinguishing method;

fig. 4 is a schematic circuit diagram of an arc extinguishing device of the circuit breaker of the present invention;

fig. 5 is a timing diagram of a switch in an arc extinguishing device of the circuit breaker according to the present invention;

fig. 6 is a structural view of a mechanical operating mechanism of an arc extinguishing apparatus of the circuit breaker according to the first embodiment of the present invention;

fig. 7 is a structural view of a mechanical operating mechanism of an arc extinguishing apparatus of a circuit breaker according to a second embodiment of the present invention.

Detailed Description

The invention is based on the research of the applicant on the electronic circuit technology for a long time, and the research on the structural design breaks through the thinking fixed form in the prior art.

As shown in fig. 4, a schematic circuit diagram of an arc extinguishing device of a circuit breaker according to the present invention is a circuit breaker, which includes an arc extinguishing device, the arc extinguishing device includes an arc extinguishing circuit and a mechanical operating mechanism linked with the arc extinguishing circuit, the mechanical operating mechanism includes a stationary contact and a movable contact, the movable contact includes a first movable contact and a second movable contact, the first movable contact and the second movable contact operate asynchronously, the first movable contact is used to connect a weak circuit (the weak circuit refers to the electric energy in the control system, and the weak circuit refers to the control system circuit), and the second movable contact is used to connect a strong circuit (the strong circuit refers to the electric energy in the power system, and the strong circuit refers to the power energy source circuit).

The arc extinguishing circuit comprises a switch J1, a switch J2, a switch J3, a switch J4, a diode D1 and a diode D3, wherein one end of the switch J3 is connected with an input positive end, the other end of the switch J3 is connected with one end of the switch J4, and the other end of the switch J4 is connected with an output positive end; one end of the switch J1 is connected with the input negative terminal, the other end of the switch J1 is connected with one end of the switch J2, and the other end of the switch J2 is connected with the output negative terminal; the anode of the diode D1 is connected with the other end of the switch J1 and one end of the switch J2 respectively, and the cathode of the diode D1 is connected with the positive input end; the anode of the diode D2 is connected to the negative input terminal and one end of the switch J1, respectively, and the cathode of the diode D2 is connected to the other end of the switch J3 and one end of the switch J4, respectively; wherein the content of the first and second substances,

the switches J1 and J3 form a first pair of switch groups which act synchronously and are used for being connected with the first movable contact, and the switches J2 and J4 form a second pair of switch groups which act synchronously and are used for being connected with the second movable contact;

when the circuit breaker is closed, the second movable contact is closed firstly to realize the first closing of the second pair of switch groups; then the first movable contact is closed to realize the rear closing of the first pair of switch groups;

when the circuit breaker is disconnected, the first movable contact is disconnected firstly, so that the first pair of switch groups is disconnected firstly; the second movable contact is then opened to effect a back-off of the second pair of switch sets.

The working principle of the circuit breaker is as follows:

the closing/opening control of two pairs of switch groups of an arc extinguishing circuit in the circuit breaker is realized by carrying out the closing/opening control of contacts according to a set time sequence through two movable contacts of a mechanical operating mechanism in the circuit breaker, wherein the actions of the two movable contacts of the mechanical operating mechanism in the circuit breaker are asynchronous; the two movable contacts comprise a first movable contact and a second movable contact, and the first movable contact is connected with the first pair of switch sets and used for connecting a weak circuit; the second movable contact is connected with the second pair of switch groups and used for connecting a strong current circuit; the closing time sequence of the circuit breaker is that the second movable contact and the fixed contact are closed firstly to realize the first closing of the strong current physical loop, so that the first closing of the second pair of switch groups is realized; and then the first movable contact and the fixed contact are closed to realize the closing of a weak current loop, namely the electrification of the circuit breaker, so as to realize the rear closing of the first pair of switch groups. The disconnection time sequence of the circuit breaker is that the first movable contact and the fixed contact are disconnected firstly to realize the disconnection of the weak current loop, namely the disconnection of the circuit breaker, so as to realize the disconnection of the first pair of switch groups firstly; and then the second movable contact is disconnected with the fixed contact to realize the back disconnection of the strong electro-physical loop and realize the back disconnection of the second pair of switch groups.

The circuit breaker has the advantages that the action time sequence of the two movable contacts of the mechanical operating mechanism in the circuit breaker is the closing action time sequence of the circuit breaker, namely the second movable contact and the fixed contact are closed firstly, so that the second pair of switch groups are closed firstly; then the first movable contact and the fixed contact are closed to realize the rear closing of the first pair of switch groups; the circuit breaker is in a breaking action time sequence, namely, the first movable contact and the fixed contact are firstly broken to realize the first breaking of the first pair of switch groups; and then the second movable contact is disconnected with the fixed contact to realize the rear disconnection of the second pair of switch groups.

The control sequence of the two pairs of switch groups of the arc extinguishing circuit in the circuit breaker is, as shown in fig. 5, the closing control sequence of the circuit breaker is that the second pair of switch groups is closed first, and the first pair of switch groups is closed after a set time period t 1; the opening control sequence of the circuit breaker is that the first pair of switch groups is opened first, and the second pair of switch groups is opened after a set time period t 1.

For a better understanding of the present invention, its principles and embodiments will be described in detail below with reference to the accompanying drawings.

First embodiment

As shown in fig. 6, which is a structural diagram of a mechanical operating mechanism of an arc extinguishing device of the circuit breaker of the present invention, and shown in fig. 4, the circuit breaker includes an arc extinguishing device, the arc extinguishing device includes an arc extinguishing circuit and a mechanical operating mechanism linked with the arc extinguishing circuit, the mechanical operating mechanism includes a moving contact 1, a moving contact spring 2, a connecting rod 3, a moving contact spring 4, a moving contact 5, a stationary contact 6, a stationary contact 7, a stationary contact 8, and a stationary contact 9, and the same structures are arranged in parallel, and the moving contact 1 ', the moving contact spring 2 ', the connecting rod 3 ', the moving contact spring 4 ', the moving contact 5 ', the stationary contact 6 ', the stationary contact 7 ', the stationary contact 8 ', and the stationary contact 9 '.

When the connecting rod 3 moves downwards, the moving contact 1, the moving contact spring 2, the moving contact 5 and the moving contact spring 4 are driven to move downwards, and the distance between the bottom surface of the moving contact 1 and the fixed contact is greater than that between the bottom surface of the moving contact 5 and the fixed contact, so that in the downward movement process of the connecting rod 3, the bottom surface of the moving contact 5 is firstly contacted with the fixed contact 6 and the fixed contact 7 to realize the first closing of the second pair of switch groups, which is equivalent to the first closing of the switches J2 and J4 in the figure 4.

When the connecting rod 3 continues to move downwards again, the movable contact 5 continues to be contacted with the fixed contacts 6 and 7 under the action of the movable contact spring 4, and the bottom surface of the movable contact 1 is contacted with the fixed contacts 8 and 9 to realize the rear closing of the first pair of switch groups, which is equivalent to the rear closing of the switches J1 and J3 in FIG. 4. So far, the circuit breaker closing function is realized.

When the connecting rod 3 moves upwards, the bottom surface of the movable contact 1 is firstly separated from the fixed contacts 8 and 9, and the movable contact 5 is kept in contact with the fixed contacts 6 and 7 under the action of the movable contact spring 4 so as to realize the first disconnection of the first pair of switch groups, which is equivalent to the first separation of the switches J1 and J3 in FIG. 4.

When the connecting rod 3 continues to move upwards, the bottom surface of the movable contact 5 is separated from the fixed contacts 6 and 7, so as to realize the rear disconnection of the second pair of switch groups, which is equivalent to the rear disconnection of the switches J2 and J4 in FIG. 4.

The present embodiment can adopt, but is not limited to, the structure shown in fig. 6, wherein the schematic diagram of the arc extinguishing circuit is shown in fig. 4, the present embodiment is described by taking two switches as a pair of switch sets as an example, the switch J1(J3) in fig. 5 corresponds to the moving contact 1(1 '), and the switch J2(J4) corresponds to the moving contact 5 (5').

As shown in fig. 6, which is a timing diagram of a switch in an arc extinguishing device of the circuit breaker of the present invention, the operating principle of the arc extinguishing device of the circuit breaker of this embodiment is as follows: when the circuit breaker is closed, the moving contact 5 (5') which closes the strong current circuit is closed first, so as to realize the first closing of the mechanical contact in the strong current physical circuit, namely, the first closing of the switch J2 (J4). After the set time period t1, the movable contact 1 of the switch-on weak current loop is closed to realize the closing of the mechanical contacts in the weak current loop, namely the electrification of the circuit breaker, so as to realize the rear closing of the switch J1(J3), and the movable contact 5(5 ') in the strong current loop completes the closing action without electrification, thereby ensuring that the movable contact 5 (5') of the switch J2(J4) in the strong current physical loop of the circuit breaker is in a zero-current conduction condition at the moment of the closing of the circuit breaker. When the breaker is disconnected, the movable contact 1 (1') which is connected with the weak current circuit is firstly disconnected to realize the first disconnection of the mechanical contact in the weak current circuit of the breaker, namely the power failure of the breaker, so that the first disconnection of a switch J1(J3) is realized, the current of an inductor in a direct current circuit cannot suddenly change, the energy stored in the circuit is completely fed back to the direct current circuit by a follow current circuit formed by diodes D1 and D2, and the lossless recovery of the stored energy when the breaker is disconnected is realized. The duration of the set period t1 is set according to the required time of this energy recovery process. After the set time period t1, the movable contact 5(5 ') of the on-state strong current circuit is opened to realize the rear opening action of the mechanical contact in the strong current physical circuit, so that the rear opening of the switch J2(J4) is realized, in this way, when the switch J1(J3) is opened in advance and the switch J2(J4) is opened later, no current passes through the circuit of the breaker, so that the movable contact 5 (5') of the switch J2(J4) in the strong current physical circuit of the breaker is in the opening condition of zero current and zero voltage at the moment of the opening of the breaker, the mechanical contact has an arc extinguishing function when the breaker is closed and opened, the switch J2(J4) is opened, the physical isolation is realized, the structure is simple, the cost is low, and the service life of the product is prolonged.

Second embodiment

As shown in fig. 7, for the embodiment of the present invention, it is seen that the movable contact 1, the movable contact 5 and the fixed contact (also referred to as a fixed contact) 6 are included, under the action of an external force, the movable contact 5 moves toward the movable contact 1 and closes, which is equivalent to the first closing of the switch J2(J4) in fig. 4, and the movable contact 5 and the movable contact 1 move toward the fixed contact 6 and close, which is equivalent to the last closing of the switch J1(J3) in fig. 4, when the external force is continuously applied; when the external force is released, the movable contact 5, the movable contact 1 and the fixed contact 6 are firstly disconnected, which is equivalent to the first disconnection of the switch J1(J3) in fig. 4, and then the movable contact 5 and the movable contact 1 are disconnected, which is equivalent to the later disconnection of the switch J2(J4) in fig. 4. Through the arc extinguishing circuit in the circuit, can realize switch J1 and switch J2 according to certain time sequence switch equally, no electric arc produces in the circuit, and zero current is switched on and zero voltage disconnection has been realized to physics switch J2(J4), has realized the arc extinguishing function of the mechanical contact in the circuit breaker, has increased product life.

The foregoing description of the embodiments is provided to enable persons skilled in the art to make and use the invention, and the invention is not limited to the embodiments described above, and modifications and variations made by persons skilled in the art without departing from the spirit of the invention are within the scope of the invention.

Claims (5)

1. A circuit breaker, includes arc control device, its characterized in that: the arc-extinguishing device comprises an arc-extinguishing circuit and a mechanical operating mechanism linked with the arc-extinguishing circuit, the mechanical operating mechanism comprises a fixed contact and a movable contact,

the movable contacts comprise a first movable contact and a second movable contact, the actions of the first movable contact and the second movable contact are asynchronous, the first movable contact is used for connecting a weak current loop, and the second movable contact is used for connecting a strong current loop;

the arc extinguishing circuit comprises a switch J1, a switch J2, a switch J3, a switch J4, a diode D1 and a diode D3, wherein one end of the switch J3 is connected with an input positive end, the other end of the switch J3 is connected with one end of the switch J4, and the other end of the switch J4 is connected with an output positive end; one end of the switch J1 is connected with the input negative terminal, the other end of the switch J1 is connected with one end of the switch J2, and the other end of the switch J2 is connected with the output negative terminal; the anode of the diode D1 is connected with the other end of the switch J1 and one end of the switch J2 respectively, and the cathode of the diode D1 is connected with the positive input end; the anode of the diode D2 is connected to the negative input terminal and one end of the switch J1, respectively, and the cathode of the diode D2 is connected to the other end of the switch J3 and one end of the switch J4, respectively; wherein the content of the first and second substances,

the switch J1 and the switch J3 form a first pair of switch groups which act synchronously and are used for being connected with the first movable contact, and the switch J2 and the switch J4 form a second pair of switch groups which act synchronously and are used for being connected with the second movable contact;

when the circuit breaker is closed, the second movable contact is closed firstly to realize the first closing of the second pair of switch groups; then the first movable contact is closed to realize the rear closing of the first pair of switch groups;

when the circuit breaker is disconnected, the first movable contact is disconnected firstly, so that the first pair of switch groups is disconnected firstly; the second movable contact is then opened to effect a back-off of the second pair of switch sets.

2. The utility model provides a circuit breaker, includes the mechanical operation mechanism with the linkage of arc extinguishing circuit, mechanical operation mechanism includes first movable contact (1), first movable contact spring (2), connecting rod (3), second movable contact spring (4), second movable contact (5) and stationary contact (6, 7, 8, 9), its characterized in that: the first movable contact (1) and the second movable contact (5) of the mechanical operating mechanism are symmetrically arranged in parallel along the longitudinal axis of the connecting rod, the distance between the bottom surface of the first movable contact (1) and the fixed contact is larger than that between the second movable contact (5) and the fixed contact,

the actions of the first movable contact (1) and the second movable contact (5) are asynchronous, the first movable contact (1) is used for connecting a weak current loop, and the second movable contact (5) is used for connecting a strong current loop;

when the circuit breaker is closed, the connecting rod (3) moves downwards, and the bottom surface of the second movable contact (5) is firstly contacted with the fixed contacts (6, 7) so as to realize the first closing of the second pair of switch groups; when the connecting rod (3) continues to move downwards again, the second movable contact (5) continues to be kept in contact with the fixed contacts (6, 7) under the action of the second movable contact spring (4), and the bottom surface of the first movable contact (1) is in contact with the fixed contacts (8, 9) so as to realize the rear closing of the first pair of switch sets;

when the circuit breaker is disconnected, the connecting rod (3) moves upwards, the bottom surface of the first movable contact (1) is separated from the fixed contacts (8 and 9), and the second movable contact (5) is kept in contact with the fixed contacts (6 and 7) under the action of the second movable contact spring (4) so as to realize the prior disconnection of the first pair of switch sets; when the connecting rod (3) continues to move upwards again, the bottom surface of the second movable contact (5) is separated from the fixed contacts (6, 7) so as to realize the rear disconnection of the second pair of switch groups.

3. The utility model provides a circuit breaker, includes the mechanical operation mechanism with the linkage of arc extinguishing circuit, mechanical operation mechanism includes first movable contact (1), second movable contact (5), stationary contact (6) and link, its characterized in that: the first movable contact (1), the second movable contact (5) and the fixed contact (6) of the mechanical operating mechanism are arranged in parallel in the longitudinal direction of the vertical connecting frame, wherein,

the actions of the first movable contact (1) and the second movable contact (5) are asynchronous, the first movable contact (1) is used for connecting a weak current loop, and the second movable contact (5) is used for connecting a strong current loop;

when the circuit breaker is closed, under the action of an external force applied to the fixed contact, the second movable contact (5) moves and closes to the first movable contact (1) so as to realize the prior closing of the second pair of switch groups; continuously applying external force, the second movable contact (5) and the first movable contact (1) are closed together to move and close towards the fixed contact (6) so as to realize the rear closing of the first pair of switch groups;

when the circuit breaker is disconnected, external force is released, the first movable contact (1) and the fixed contact (6) are separated firstly, and the second movable contact (5) and the first movable contact (1) are kept closed so as to realize the first disconnection of the first pair of switch groups; then, the external force is continuously released, and the second movable contact (5) is separated from the first movable contact (1) to realize the back disconnection of the second pair of switch groups.

4. A control method of a circuit breaker, which realizes the closing/opening control of two pairs of switch groups of an arc extinguishing circuit in the circuit breaker by the closing/opening control of two contacts of a mechanical operating mechanism in the circuit breaker according to a set time sequence, the method comprises the following steps:

the actions of two movable contacts of a mechanical operating mechanism in the circuit breaker are asynchronous; the first movable contact is connected with the first pair of switch groups and used for connecting a weak current loop; the second movable contact is connected with the second pair of switch groups and used for connecting a strong current circuit;

the closing action time sequence of the circuit breaker is that the second movable contact and the fixed contact are closed firstly, so as to realize the first closing of the second pair of switch groups; then the first movable contact and the fixed contact are closed to realize the rear closing of the first pair of switch groups;

the circuit breaker is in a breaking action time sequence, namely, the first movable contact and the fixed contact are firstly broken to realize the first breaking of the first pair of switch groups; and then the second movable contact is disconnected with the fixed contact to realize the rear disconnection of the second pair of switch groups.

5. A control method of a circuit breaker, which realizes the closing/opening control of two pairs of switch groups of an arc extinguishing circuit in the circuit breaker by the closing/opening control of two contacts of a mechanical operating mechanism in the circuit breaker according to a set time sequence, the method comprises the following steps:

two pairs of switch groups of an arc extinguishing circuit in the circuit breaker are asynchronous; the first pair of switch groups is connected with the first movable contact and used for connecting a weak current loop; the second pair of switch groups is connected with the second movable contact and used for connecting a strong current circuit;

the closing control time sequence of the circuit breaker is that the second pair of switch groups is closed first, and the first pair of switch groups is closed after a set time period;

the opening control sequence of the circuit breaker is that the first pair of switch groups is opened first, and the second pair of switch groups is opened after a set time interval.

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