CN115910672A - Contact system of circuit breaker and circuit breaker - Google Patents
Contact system of circuit breaker and circuit breaker Download PDFInfo
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- CN115910672A CN115910672A CN202111106815.4A CN202111106815A CN115910672A CN 115910672 A CN115910672 A CN 115910672A CN 202111106815 A CN202111106815 A CN 202111106815A CN 115910672 A CN115910672 A CN 115910672A
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Abstract
The invention provides a contact system of a circuit breaker, which comprises a movable contact group and a fixed contact, wherein the movable contact group and the fixed contact are arranged in a shell of the circuit breaker, the movable contact group comprises at least one first movable contact and at least one second movable contact, the length of the first movable contact is greater than that of the second movable contact, the first movable contact comprises a first conducting rod and a movable arc contact, the second movable contact comprises a second conducting rod and a second movable main contact, the fixed contact comprises a conductor, a static main contact, a static arc contact and an arc striking plate, the second movable main contact corresponds to the static main contact, the movable arc contact corresponds to the static arc contact, and the static arc contact is at least 5mm higher than the static main contact in the height direction; meanwhile, the arc striking open distance can be greatly increased, so that the arc voltage is improved, and the arc is quickly extinguished.
Description
Technical Field
The present invention relates to a contact system of a circuit breaker, and to a circuit breaker comprising said contact system.
Background
The frame circuit breaker is a switching device capable of carrying and breaking a current under a normal circuit condition and also capable of carrying and breaking a current under an abnormal circuit condition within a predetermined time. With the development of new energy technologies, such as the development of photovoltaic, wind power and energy storage, the voltage of an alternating current system reaches AC1500V, the voltage of a direct current system reaches DC1500V, and with the continuous rise of the system voltage, the rated working voltage of matched components and parts also needs to meet the requirement of the system voltage, but with the rise of the working voltage, higher requirements are provided for the reliable breaking performance of the circuit breaker.
The current common solution for improving the breaking capacity of the circuit breaker is as follows: 1. increasing the opening distance of the contact; 2. increasing the area and the number of arc extinguishing grid pieces of the arc extinguishing chamber; 3. adding gas generating materials; 4. increasing the electric repulsion between the contacts; 5. adding current limiting measures, such as providing high resistance materials, etc.; from the arc voltage formula it follows: u shape arc =U c +U a +U l =△U+U l In the formula, U c For cathode fall, U a For anode drop, U l For arc column voltage drop, Δ U is the near pole voltage drop, which is the sum of cathode voltage drop and anode voltage drop, Δ U is related to the contact material, and for commonly used contact materials, Δ U can be typically 20V-25V. Therefore, increasing the arc voltage is mainly to increase the U l Arc column pressure drop, U l The formula of (1) is: u shape l = (l/σ A) i, where l is arc length and σ is arc equivalentConductivity, A is the arc cross section, i is the arc current; according to the formula, the arc length is increased, the arc section is reduced, and the voltage drop of the arc column can be improved; therefore, increasing the contact opening distance and lengthening the arc length are the most direct and effective measures for improving the breaking capacity and solving the problem of reliable arc extinction under the condition of high voltage.
As shown in fig. 9, in the conventional circuit breaker, when the contact opening distance is X1, the arc striking opening distance is a1, and the distance of a1 is the length of the moving contact after pulling up the arc, in an actual design, due to the limitation of the circuit breaker volume and the operating mechanism, the contact opening distance cannot be greatly increased to an ideal range, and how to lengthen the arc length under the condition that the contact opening distance is not changed becomes a key problem to be solved urgently.
In the breaking process of the existing circuit breaker, because arc extinguishing grids on the upper part of an arc extinguishing chamber are limited by opening distance, the number of the arc extinguishing grids actually participating in cutting and cooling electric arcs is not enough, and at least 1/5 of the arc extinguishing grids do not participate in the arc extinguishing process. Meanwhile, in the breaking process, particularly under the condition of high voltage, the electric arc breakdown capacity is very strong, the phenomenon that the electric arc is transferred downwards is easily generated, and the electric arc forms breakdown at the lower parts of the moving contact and the static contact, so that the breaking failure is caused; there is therefore a need for a technique to address the above problems.
Disclosure of Invention
In order to solve at least one of the above problems, the invention provides a contact system for increasing an arc striking open distance, further lengthening an electric arc, improving the utilization rate of an arc extinguishing grid plate, avoiding the downward transfer of the electric arc and forming breakdown at the lower parts of a moving contact and a static contact, and the specific scheme is as follows:
the invention provides a contact system of a circuit breaker, which comprises a movable contact group and a fixed contact, wherein the movable contact group and the fixed contact are arranged in a shell of the circuit breaker, the movable contact group comprises at least one first movable contact and at least one second movable contact, the length of the first movable contact is greater than that of the second movable contact, the first movable contact comprises a first conducting rod and a movable arc contact, the second movable contact comprises a second conducting rod and a second movable main contact, the fixed contact comprises a conductor, a fixed main contact, a fixed arc contact and an arc striking sheet, the second movable main contact corresponds to the fixed main contact, the movable arc contact corresponds to the fixed main contact, and the fixed arc contact is higher than the fixed main contact by at least 5mm in the height direction.
Further, a step is formed in the height of the static arc contact and the electric conductor.
Further, the static arc contact is arranged above the arc striking plate.
Furthermore, the arc striking plate is made of metal materials and is fixed on the electric conductor in a welding or riveting mode.
Furthermore, the first moving contact also comprises a first moving main contact, and the first moving main contact corresponds to the static main contact.
The invention also provides a circuit breaker, which comprises the contact system, the arc extinguish chamber, the insulating shell, the operating mechanism, the tripping system and the wiring terminal.
Furthermore, the explosion chamber includes a plurality of arc extinguishing bars piece of establishing along the upper and lower direction stack, quiet arcing contact is higher than the arc extinguishing bars piece of below in the direction of height.
Furthermore, the arc extinguishing chamber is located the static contact the place ahead, the striking piece from the static arc contact below to the arc extinguishing chamber extends.
Further, when the circuit breaker is in a connection state, the first movable main contact, the second movable main contact and the static main contact are jointed, and the first movable arc contact and the static arc contact are jointed or disconnected.
Further, during the closing process of the circuit breaker, the joint time of the movable arc contact and the fixed arc contact is earlier than that of the first movable main contact, the second movable main contact and the fixed main contact.
Furthermore, the arc extinguish chamber is arranged in front of the fixed contact and the movable contact group, and the movable arc contact and the fixed arc contact extend into the arc extinguish chamber.
The invention has the following beneficial effects:
1. under the condition that the contact opening distance is not changed, the static arc contact is lifted, so that the moving contact is lifted correspondingly at the position of opening, the moving contact corresponds to the arc-extinguishing grid piece on the uppermost part of the arc-extinguishing chamber, electric arcs are led to the upper part, the arc-extinguishing grid piece on the upper part of the arc-extinguishing chamber is fully utilized, the utilization rate of the arc-extinguishing grid piece is greatly improved, and the electric arc voltage is improved;
2. the static arc contact is lifted, so that the static arc contact is higher than the arc-extinguishing grid pieces at the lower part of the arc-extinguishing chamber, the arc pulled up when the moving contact and the static contact are disconnected extends from the arc-extinguishing grid piece at the upper part of the arc-extinguishing chamber to the arc-extinguishing grid piece at the lowest part, the arc striking opening distance is greatly increased, the arc length is increased, the arc voltage is increased, and the arc is rapidly extinguished;
3. after the static arc contact is lifted, a step is formed between the static arc contact and the electric conductor of the static contact, so that the electric arc is not easy to jump to the electric conductor through the step, the electric arc is prevented from transferring downwards, and the condition that the electric arc is broken down between the electric conductor of the static contact and the electric contact of the moving arc is avoided;
4. in the breaking process of a contact system of the circuit breaker, the first movable main contact, the second movable main contact and the static main contact cannot be ablated and do not participate in breaking due to electric arc generation, so that the reliable passing of post-test temperature rise projects of an electric service life test and a breaking test of the circuit breaker can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a contact system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a first movable contact and a second movable contact according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a contact system in a closing process according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a contact system in a closing completed state according to an embodiment of the present invention.
Fig. 5 and 6 are schematic diagrams illustrating a contact system opening process according to a first embodiment of the invention.
Fig. 7 is a schematic structural diagram of an arc extinguish chamber according to a first embodiment of the invention.
Fig. 8 is a diagram illustrating a positional relationship between a contact system and an arc-extinguishing chamber according to a first embodiment of the present invention.
Fig. 9 is a schematic diagram of contact opening, arc strike opening, and arc length of a conventional circuit breaker.
Fig. 10 is a schematic view of a contact opening, an arc starting opening and an arc length of the circuit breaker according to the first embodiment of the present invention.
Fig. 11 is a schematic diagram of the contact system according to the first embodiment of the present invention during the movement time t1 during the opening process.
Fig. 12 is a schematic diagram of a contact system of a conventional circuit breaker moving for a time t1 during opening.
Fig. 13 is a schematic force diagram of a contact system according to a first embodiment of the invention.
Fig. 14 is a schematic diagram showing the comparison of the over travel of the contact system of the first embodiment of the present invention and the contact system of the conventional circuit breaker.
Fig. 15 is a schematic diagram of a contact system in an on state according to a second embodiment of the present invention.
Fig. 16 to 18 are schematic diagrams illustrating a contact system opening process according to a second embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, parts without departing from the spirit of the invention.
For convenience of description, the directions and the upper directions of the contact system and the breaker mentioned below correspond to the directions X and Y shown in fig. 1, respectively, and it should be noted that the directions or the positional relationships indicated above are based on the directions or the positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, cannot be construed as limiting the present invention.
Example one
As shown in fig. 1 and fig. 2, the present embodiment discloses a contact system of a circuit breaker, including a movable contact group 1 and a fixed contact 2 disposed in a housing of the circuit breaker, where the movable contact group 1 includes a first movable contact 11 and a second movable contact 12 rotatably connected around a same rotation center, a length of the first movable contact 11 is greater than that of the second movable contact 12, the first movable contact 11 includes a first conductive rod 111, a first movable main contact 112 and a movable arcing contact 113, the second movable contact 12 includes a second conductive rod 121 and a second movable main contact 122, the fixed contact 2 includes a conductive body 201, a stationary main contact 202, a stationary arcing contact 203 and an arc striking plate 204, the first movable main contact 112 and the second movable main contact 122 both correspond to the stationary main contact 202, in other embodiments, the first movable main contact 11 may not be disposed with the first movable main contact 112, the same invention effect can be achieved only by arranging the second movable main contact 122 on the second movable contact 12, the movable arc contact 113 corresponds to the stationary arc contact 203, the stationary arc contact 203 is higher than the stationary main contact 202 by at least 5mm in the height direction, so that a step is formed on the stationary arc contact 203 and the conductor 201 in height, the arc is not easy to jump to the conductor through the step, the arc is prevented from transferring downwards, the arc is prevented from breaking through between the stationary contact conductor and the movable arc contact, the arc striking plate 204 is made of metal material and is fixed on the conductor 201 in a welding or riveting manner, the arc striking plate 204 extends from the lower part of the stationary arc contact 203 to the arc extinguishing chamber, in this embodiment, a protrusion is arranged at one end of the arc striking plate 204, the stationary arc contact 203 is arranged at the upper part of the protrusion of the arc striking plate 204, so that the stationary arc contact 203 is higher than the stationary main contact 202 by at least 5mm, that is, the height difference H between the static arc contact 203 and the static main contact 202 is not less than 5mm, and the height difference H between the static arc contact 203 and the static main contact 202 may be 5mm or more than 5mm, in this embodiment, the height difference H between the static arc contact 203 and the static main contact 202 is 8.5mm, the opening distance of the contact between the movable contact and the static contact is not changed, and the height of the movable contact is raised correspondingly.
In other specific embodiments, one end of the arc striking plate 204 protrudes upward to raise the height of the fixed arc contact 203 by bending the arc striking plate 204 and arranging an insulating material below the upward bending portion.
In the closing process of the circuit breaker, as shown in fig. 3, when a moving contact group of a contact system contacts a fixed contact, firstly, a moving arc contact 113 of the first moving contact 11 contacts a fixed arc contact 203 of the fixed contact 2, and at this time, a gap is formed between the first moving main contact 112, the second moving main contact 122 and the fixed main contact 202; when the moving contact group 1 continues to move towards the fixed contact 2, the first moving main contact 112 and the second moving main contact 122 contact with the fixed main contact 202, and at this time, the circuit breaker completes a closing operation, as shown in fig. 4. In the process of closing the circuit breaker, the movable arc contact 113 contacts the fixed arc contact 203 first, and the first movable main contact 112 and the second movable main contact 122 contact the fixed main contact 202 later.
In the process of opening the circuit breaker, as shown in fig. 5-6, the first movable main contact 112, the second movable main contact 122 and the fixed main contact 202 are firstly opened, then the movable arc contact 113 and the fixed arc contact 203 are opened again, the opening time of the movable contact 113 and the fixed arc contact 203 is later than the opening time of the first movable main contact 112, the second movable main contact 122 and the fixed main contact 202, so that an arc is generated between the movable arc contact 113 and the fixed arc contact 203, no arc is generated between the first movable main contact 112, the second movable main contact 122 and the fixed main contact 202, and the circuit breaker is not ablated, and the post-test temperature rise items of the circuit breaker electrical life test and the breaking test can be ensured to reliably pass.
The embodiment of the invention also discloses a circuit breaker, which comprises the contact system, an arc extinguish chamber 3, an insulating shell, an operating mechanism, a tripping system and a connecting terminal, wherein the arc extinguish chamber 3 comprises a plurality of arc extinguish grid sheets which are stacked up and down, the arc extinguish chamber 3 is positioned in front of the movable contact group 1 and the static contact 2, the movable arc contact 113 and the static arc contact 203 extend into the arc extinguish chamber 3, the static arc contact 203 is higher than the lowermost arc extinguish grid sheet of the arc extinguish chamber 3 by 5mm in the height direction, when the movable contact and the static arc contact are disconnected, the pulled arc extends from the upper arc extinguish grid sheet of the arc extinguish chamber to the lowermost arc extinguish grid sheet, the arc striking distance is greatly increased, the arc length is increased, the arc voltage is improved, and the arc is rapidly extinguished.
Specifically, as shown in fig. 7 and 8, the arc extinguishing chamber 3 includes arc barriers 304 located on the left and right sides, a bent arc-extinguishing grid 305 located above, a plurality of arc-extinguishing grid 306 located behind the bent arc-extinguishing grid 305, and insulating gas-generating barriers 307, wherein the bent arc-extinguishing grid 305 and two ends of the arc-extinguishing grid 306 are supported by the arc barriers 304, the arc-extinguishing grid 306 includes a base portion and two side legs extending downward from the base portion, the insulating gas-generating barriers 307 form accommodating cavities for accommodating the two side legs of the plurality of arc-extinguishing grid 306, the two side legs extend into the accommodating cavities, the insulating gas-generating barriers 307 wrap the legs of the plurality of arc-extinguishing grid 306, and a space is formed between the insulating gas-generating barriers 307 on two sides inside the arc extinguishing chamber 3, that is, that the movable arc contact 113 and the stationary arc contact 203 extend into the space between the left and right insulating gas-generating barriers 307 of the arc extinguishing chamber 3, and the insulating barriers 307 wrap the legs of the plurality of arc-extinguishing head group 1 and the arc-extinguishing grid 306. The height of the insulating gas-generating partition 307 in the vertical direction is smaller than the height of the arc-isolating walls 304 in the vertical direction, a wider arc channel is formed between the arc-isolating walls 304 on two sides above the insulating gas-generating partition 307, and a narrower arc channel is formed between the insulating gas-generating partitions 307 on two sides.
In this embodiment, the minimum distance between the moving contact group 1 and the arc-extinguishing grid pieces 305 and 306 is greater than or equal to 10mm, so that there is a sufficient insulation distance between the moving contact group 1 and the arc-extinguishing grid pieces 305 and 306.
With reference to fig. 7, the arc extinguish chamber 3 further includes an arc extinguish chamber cover 301, an arc extinguish partition 302 and an arc extinguish screen 303, the arc extinguish partition 302 and the arc extinguish screen 303 are disposed in the arc extinguish chamber cover 301, the arc extinguish partition 302 and the arc extinguish screen 303 may be disposed in one or more layers according to practical situations, the arc extinguish partition 302 and the arc extinguish screen 303 may effectively eliminate free metal ions in a highly ionized state generated when the moving contact group and the static contact are disconnected, and place the free ionized particles to fly out of the arc extinguish chamber, thereby realizing disconnection of zero flashover by high voltage and large current.
In each electrified breaking process of the circuit breaker, because the breaking time of the movable arc contact 113 and the fixed arc contact 203 is always later than the breaking time of the first movable main contact 112, the second movable main contact 122 and the fixed main contact 202, electric arcs are generated between the movable arc contact 113 and the fixed arc contact 203, the resistance and the temperature of the contact part of the movable arc contact 113 and the fixed arc contact 203 are continuously increased at the breaking moment, when the temperature reaches the melting temperature of the contact material, a metal bridge of molten metal is formed at the contact point, and the metal bridge is broken by the continuous breaking action of the movable arc contact 113 to generate the electric arcs. At this time, in the narrow gap formed by the insulating gas-generating partition 307 and the arc-extinguishing grid plates 306, the insulating gas-generating partition 307 generates gas under the action of the electric arc, the electric arc is blown into the arc-extinguishing chamber and is rapidly cut into small short arcs by the arc-extinguishing grid plates 306, and meanwhile, under the combined action of the arc striking plates 204 and the bent arc-extinguishing grid plates 305, all the arc-extinguishing grid plates are effectively applied to the arc-extinguishing process, so that rapid and effective arc extinguishing can be realized. The bent arc-extinguishing grid piece 305 is a two-bent structure and forms a V-shaped current path with the sharp corner 114 at the upper end of the first movable contact 11, and the structure greatly enhances the electric field intensity at the position, is more favorable for leading electric arcs to the upper end of the arc-extinguishing chamber 3, and makes full use of the arc-extinguishing grid piece at the upper end.
Referring to fig. 10, in this embodiment, a contact opening distance X2 of the circuit breaker is equal to a contact opening distance X1 of the conventional circuit breaker, that is, X2= X1, because the static arc contact is raised, by setting the arc striking plate 204, the arc on the static arc contact is caused to flow toward the rear of the arc extinguishing chamber, and the arc striking opening distance of the circuit breaker of this embodiment is a2+ b, where a2 is a length of the moving contact after pulling up the arc after the moving contact is opened, and b is a length of the static contact after the arc striking plate is pulled back. It can be seen that the arc striking opening distance a2+ b of the circuit breaker in this embodiment is greater than a1 (the existing circuit breaker contact opening distance is the arc striking opening distance of X1).
Meanwhile, in the present embodiment, after the movable arc contact 113 and the fixed arc contact 203 are opened, the striking angle 115 of the first movable contact 11 can be just corresponding to the bent arc-extinguishing grid 305 at the uppermost portion of the arc-extinguishing chamber, and the uppermost grid can be used, so that the length of a2 is also greater than the length of a 1.
From the arc voltage formula it follows: u shape arc =U c +U a +U l =△U+U l In the formula, U c For cathode fall, U a For anode voltage drop, U l For arc column voltage drop, delta U is near-pole voltage drop and is the sum of cathode voltage drop and anode voltage drop, delta U is related to contact material, and for common contact material, delta U can be 20V-25V, so that increasing arc voltage is mainly to increase U l Arc column pressure drop, U l The formula of (1) is as follows: u shape l = (l/σ a) i, where l is arc length, σ is arc equivalent conductivity, a is arc cross section, and i is arc current; therefore, when the invention is in breaking, the length of the electric arc is greatly increased compared with the traditional structural scheme, thereby increasing the voltage and the current limiting effect and improving the breaking capacity of the product.
Further, after the static arc contact 203 is lifted, the distance Y2 between the static contact conductor 201 on the lower portion of the static arc contact 203 and the first conducting rod 111 is synchronously increased, a step is formed between the static arc contact 203 and the conductor 201 on the lower portion, the arc is difficult to jump from the static arc contact 203 to the conductor 201 on the lower portion through the step height, the arc is prevented from transferring downwards, breakdown is caused between the conductor 201 on the lower portion and the first conducting rod 111, and the arc is guaranteed to smoothly enter an arc extinguish chamber.
Compared with the prior structure, the contact system of the embodiment has the advantage that the height direction of the static arc contact 203 is at least 5mm higher than that of the static main contact 202, so that the contact system moves at the same time t 1 The first movable main contact 112, the second movable main contact 122 and the fixed main contact 202 of the inner movable contact group 1 are opened by the same opening distance M, as shown in fig. 11, at this time, the movable arc contact 113 and the fixed arc contact 203 of the present embodiment are just separated, and as shown in fig. 12, the distance N has been opened between the movable arc contact and the fixed arc contact of the existing structure, the time for opening the gap between the movable arc contact 113 of the movable contact group 1 and the fixed arc contact 203 of the fixed contact 2 in the present embodiment is significantly later than that of the existing structure, the time for generating the arc in the present embodiment is significantly later than that of the existing structure, and the inherent mechanical action time of the two structures is the same, so that the present embodiment can reduce the overall arc burning time. In the on state of the circuit breaker, a force analysis formula is obtained as shown in fig. 13: f S *L S =F Z *L Z +F H *L H In which F S And L S Arm of force of pressure and spring pressure, respectively, provided by contact spring, F Z And L Z Respectively the contact pressure reaction force between the first movable main contact 112 and the stationary main contact 202 and the arm of this force, F H And L H The reaction force of the contact pressure between the movable arc contact 113 and the fixed arc contact 203 and the force arm of the reaction force are respectively, the movable arc contact 113 is far away from the fulcrum of the first conducting rod 111 than the first movable main contact 112, and the lever is a typical lever which wastes labor, and under the condition that the compression amount of the spring and the installation position of the spring are not changed, the contact pressure of the first movable contact 11 is reduced due to the addition of the movable arc contact 113, the contact pressure of the whole contact system is also obviously reduced, which cannot be avoided by the existing structure and the embodiment. As shown in fig. 14, the fixed arc contact 203 of the present embodiment is significantly higher than the fixed main contact 202, the overtravel C2 of the moving arc contact 113 of the first moving contact 11 is significantly greater than the overtravel C1 of the arc contact of the conventional circuit breaker, and the structural design of the present embodiment increases the compression amount and pressure of the contact spring, i.e., can provide higher contact pressure of the contact system, thereby ensuring the short-time current tolerance item and temperature tolerance of the circuit breakerThe lift project can pass reliably.
Example two
The present embodiment discloses a contact system of a circuit breaker with another structure, which is different from the first embodiment, when the circuit breaker completes the closing, the first movable main contact 112, the second movable main contact 122 and the stationary main contact 202 of the contact system are in a contact state, and the movable arcing contact 113 and the stationary arcing contact 203 are in a switch state, as shown in fig. 15.
In this embodiment, in the opening process of the circuit breaker, as shown in fig. 16 to 18, the movable arc contact 113 is firstly contacted with the stationary arc contact 203, then the first movable main contact 112, the second movable main contact 122 are disconnected with the stationary main contact 202, and finally the movable arc contact 113 is disconnected with the stationary arc contact 203.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (11)
1. The contact system of the circuit breaker comprises a movable contact group and a fixed contact which are arranged in a shell of the circuit breaker, wherein the movable contact group comprises at least one first movable contact and at least one second movable contact, the length of the first movable contact is larger than that of the second movable contact, the first movable contact comprises a first conducting rod and a movable arc contact, the second movable contact comprises a second conducting rod and a second movable main contact, the fixed contact comprises a conductor, a static main contact, a static arc contact and an arc striking sheet, the second movable main contact corresponds to the static main contact, the movable arc contact corresponds to the static arc contact, and the movable arc contact is characterized in that the static arc contact is higher than the static main contact by at least 5mm in the height direction.
2. The contact system of claim 1, wherein the stationary arc contact forms a step in height with the electrical conductor.
3. The contact system of claim 1, wherein the stationary arc contact is disposed above an arc runner.
4. A contact system according to claim 1 or 3, wherein the arc ignition piece is made of a metal material and is fixed to the electrical conductor by welding or riveting.
5. The contact system of claim 1, wherein said first movable contact further comprises a first movable main contact, said first movable main contact corresponding to said stationary main contact.
6. A circuit breaker, characterized in that it comprises a contact system according to any one of claims 1-5, an arc chute, an insulating housing, an operating mechanism, a trip system and a terminal block.
7. The circuit breaker of claim 6, wherein the arc extinguishing chamber comprises a plurality of arc extinguishing grid plates stacked in an up-down direction, and the static arc contact is higher than the lowest arc extinguishing grid plate in a height direction.
8. The circuit breaker of claim 6, wherein the arc chute is located in front of the stationary contact, and the arc runner extends from below the stationary arc contact to the arc chute.
9. The circuit breaker of claim 6, wherein the first moving main contact, the second moving main contact, and the stationary main contact are engaged, and the first moving arcing contact and the stationary arcing contact are engaged or disengaged when the circuit breaker is in the on state.
10. The circuit breaker of claim 6, wherein the moving arcing contact and the stationary arcing contact are engaged at a time earlier than the first moving main contact, the second moving main contact, and the stationary main contact are engaged during a closing process of the circuit breaker.
11. The circuit breaker of claim 6, wherein the arc chute is disposed in front of the stationary contact and the set of movable contacts, the movable arcing contact and the stationary arcing contact extending into an interior of the arc chute.
Priority Applications (1)
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CN202111106815.4A CN115910672A (en) | 2021-09-22 | 2021-09-22 | Contact system of circuit breaker and circuit breaker |
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CN202111106815.4A CN115910672A (en) | 2021-09-22 | 2021-09-22 | Contact system of circuit breaker and circuit breaker |
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CN115910672A true CN115910672A (en) | 2023-04-04 |
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CN202111106815.4A Pending CN115910672A (en) | 2021-09-22 | 2021-09-22 | Contact system of circuit breaker and circuit breaker |
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- 2021-09-22 CN CN202111106815.4A patent/CN115910672A/en active Pending
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