CN117334536A - Air switch structure for solving closing surge impact of electric secondary circuit and method thereof - Google Patents
Air switch structure for solving closing surge impact of electric secondary circuit and method thereof Download PDFInfo
- Publication number
- CN117334536A CN117334536A CN202311407299.8A CN202311407299A CN117334536A CN 117334536 A CN117334536 A CN 117334536A CN 202311407299 A CN202311407299 A CN 202311407299A CN 117334536 A CN117334536 A CN 117334536A
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- Prior art keywords
- current
- auxiliary contact
- limiting resistor
- air switch
- contact
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000670 limiting effect Effects 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1009—Interconnected mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an air switch structure for solving the problem of surge impact caused by closing an electric secondary circuit and a method thereof, wherein an auxiliary contact and a current-limiting resistor are added in the air switch, the auxiliary contact is linked with a main contact of the air switch, the current-limiting resistor is connected with the main contact in parallel after being connected with the auxiliary contact in series, the auxiliary contact is connected with the current-limiting resistor into the secondary circuit to play a role in limiting surge impact current during closing, the auxiliary contact is connected with the current-limiting resistor into the secondary circuit to limit current for charging a charging element in a load before the main contact is closed in the closing process of the air switch, and the main contact is closed to short-circuit the auxiliary contact and the current-limiting resistor to enable the auxiliary contact and the current-limiting resistor to exit from working. According to the invention, the air switch mechanical structure design is used for adjusting the opening and closing time difference of the main contact and the auxiliary contact, realizing the functions of limiting current, charging and exiting current, realizing high-reliability suppression of closing surge impact and power supply to the load, and not adding too many other devices such as additional components and the like, and not occupying more installation space.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to an air switch structure and a method for solving the problem of closing surge impact of an electrical secondary circuit.
Background
In the process of switching on and electrifying, the electric secondary circuit generates large current surge impact in the switching on process due to the existence of large capacitance of part of equipment and circuits, the impact is caused on equipment such as an upper power supply and a lower load, the adverse effects that the equipment is damaged, the upper power supply fluctuates to cause misoperation or incapability of normal operation of other equipment, the upper power supply trips, incapability of normal switching on and electrifying and the like exist, and therefore, the problem of solving the switching on surge impact of the electric secondary circuit is very important. The current method for solving the problem of closing surge impact of the electric secondary circuit has the following defects: 1. the soft starting device is added in the loop, and the closing surge impact is reduced by gradually increasing the voltage, so that the device has the defects of complex structure, high cost, large occupied space, reliability reduction and the like; 2. the circuit is connected with resistance, inductance, delay control equipment and the like in series to reduce closing surge current, and the circuit has the defects of complex structure, large occupied space, high cost, reliability reduction and the like; 3. the air switch with larger rated working current solves the problem that the switch is switched on and tripped and cannot normally switch on due to switching on surge current, and has the defects that the switching on surge current cannot be reduced, the protection effect on a loop short-circuit fault is poor and the like.
Disclosure of Invention
The invention aims to provide an air switch structure and a method for solving the problem that in the prior art, the method for solving the problem that the closing surge current of an electric secondary circuit has a complex equipment structure and cannot reduce the protection effect of the closing surge current on the circuit short-circuit fault.
The invention solves the problems by the following technical proposal:
an air switch structure for solving the problem of closing surge impact of an electric secondary circuit is characterized in that an auxiliary contact and a current limiting resistor are additionally arranged in or outside the air switch, the current limiting resistor is connected with the auxiliary contact in series and then connected with a main contact in parallel, the auxiliary contact is linked with the main contact of the air switch, and when the air switch is closed, the auxiliary contact is connected into the secondary circuit before the main contact.
Further, the current limiting resistor is an adjustable resistor, and further, the current limiting resistor is also connected with an inductor in series.
A method for solving surge impact of closing an electric secondary circuit is to add an auxiliary contact and a current-limiting resistor on an air switch, wherein the auxiliary contact is linked with a main contact of the air switch, the current-limiting resistor is connected with the auxiliary contact in parallel after being connected in series, the auxiliary contact is used for connecting the current-limiting resistor into the secondary circuit to limit surge impact current when closing, in the closing process of the air switch, the auxiliary contact is connected with a charging element in the secondary circuit to limit the current before the main contact is closed, then the main contact is closed to short-circuit the auxiliary contact and the current-limiting resistor to enable the auxiliary contact and the current-limiting resistor to stop working.
When the air switch is switched on, the auxiliary contact is closed before the main contact in the mechanical angle design, the current-limiting resistor is connected into a loop after the auxiliary contact is closed, and at the moment, the load is subjected to current-limiting charging through the loop formed by the auxiliary contact and the current-limiting resistor; then the main contact is also closed, the loop formed by the auxiliary contact and the current-limiting resistor is short-circuited to exit the current-limiting function, and the electric secondary loop current flows through the main contact to achieve the purpose of normal power supply. Because the main contact and the auxiliary contact have closing time difference in mechanical structural design, when the main contact is closed, a loop formed by the auxiliary contact and the current-limiting resistor basically completes the charging of components such as a capacitor in a load, and the like, so that large surge current impact can not be generated due to the charging of the components such as the capacitor in the load when the main contact is closed, thereby achieving the purpose of solving the closing surge current impact of an electric secondary loop.
The current limiting resistor is an adjustable resistor, can be flexibly adjusted according to a load, can better inhibit closing surge impact current, and is better in adaptability.
The current limiting resistor is also connected with an inductor in series, so that the surge impact effect is better inhibited. Not only is dc available, but also ac circuitry is applicable.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the time difference of opening and closing of the main contact and the auxiliary contact is adjusted through the mechanical structure design of the air switch, the functions of limiting current, charging and exiting the current are realized, and the high-reliability suppression of closing surge impact and the power supply to the load are realized.
(2) The invention reduces the surge current of closing and does not increase other devices such as extra components, occupies more installation space, increases cost, reduces the reliability of the device, and has simple structure, high reliability, good economy and wide application range.
(3) According to the invention, after the resistance loop is connected with the inductance coil in series, the surge impact effect can be better inhibited. Not only is dc available, but also ac circuitry is applicable.
(4) The auxiliary contact and the current-limiting resistor added in the invention can be realized by structural modification in the air switch, and can also be realized by adding the auxiliary contact, the current-limiting resistor and the mechanical linkage piece outside the air switch, so that the realization mode is flexible.
Drawings
FIG. 1 is a schematic diagram of the switching-off state of the present invention;
fig. 2 is a schematic diagram of an auxiliary contact switching-on principle of the present invention;
fig. 3. The principle schematic diagram of the main contact of the invention after closing.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1:
in combination with the structure shown in fig. 1, an auxiliary contact K1-2 and a current limiting resistor R1 are added inside or outside the air switch to solve the problem of closing surge impact of an electric secondary circuit, the current limiting resistor R1 is connected with the auxiliary contact K1-2 in series and then connected with a main contact in parallel with the K1-1, the auxiliary contact K1-2 is linked with the main contact K1-1 of the air switch, and when the air switch is closed, the auxiliary contact K1-2 is connected into the secondary circuit before the main contact K1-1.
According to the invention, the time difference of opening and closing of the main contact and the auxiliary contact is adjusted through the mechanical structure design of the air switch, the functions of limiting current, charging and exiting the current are realized, and the high-reliability suppression of closing surge impact and the power supply to the load are realized.
Further, the current limiting resistor R1 is an adjustable resistor, can be flexibly adjusted according to a load, and is better in adaptability, and closing surge impact current is better restrained.
Further, the current limiting resistor R1 is further connected in series with an inductor L1. According to the invention, after the resistance loop is connected with the inductance coil in series, the surge impact effect can be better inhibited. Not only is dc available, but also ac circuitry is applicable.
Example 2:
referring to fig. 1, an auxiliary contact K1-2 and a current limiting resistor R1 are added inside or outside an air switch, the auxiliary contact K1-2 is linked with a main contact K1-1 of the air switch, the current limiting resistor R1 is connected with the auxiliary contact K1-2 in series and then is connected with the main contact K1-1 in parallel, the auxiliary contact K1-2 is used for connecting the current limiting resistor R1 into the secondary circuit to limit surge current when the air switch is closed, the auxiliary contact K1-2 is closed before the main contact K1-1 to connect the current limiting resistor R1 into the secondary circuit to limit current to charge charging components in a load, and then the main contact K1-1 is closed to short-circuit the auxiliary contact K1-2 and the current limiting resistor R1 to enable the auxiliary contact and the current limiting resistor to exit working.
When the electric secondary circuit is electrified and switched on, the main contact K1-1 and the auxiliary contact K1-2 are connected through a mechanical structure to act together, wherein the auxiliary contact K1-2 is firstly closed than the main contact K1-1 in mechanical angle design, the auxiliary contact K1-2 is connected with a current limiting resistor R1 into the circuit after being closed, as shown in figure 2, at the moment, the load is subjected to current limiting charging through the circuit formed by the auxiliary contact K1-2 and the current limiting resistor R1, then the main contact K1-1 is also closed, as shown in figure 3, the circuit formed by the auxiliary contact K1-2 and the current limiting resistor R1 is short-circuited to exit the current limiting function, and the electric secondary circuit current flows from the main contact K1-1 to achieve the purpose of normal power supply. Because the main contact K1-1 and the auxiliary contact K1-2 have closing time difference in mechanical structural design, when the main contact K1-1 is closed, a loop formed by the auxiliary contact K1-2 and the current limiting resistor R1 basically completes the charging of components such as a capacitor in a load, and the like, the main contact cannot generate large surge current impact due to the charging of the components such as the capacitor in the load, and the purpose of solving the surge current impact of the closing of an electric secondary loop is achieved.
Because the auxiliary contact K1-2 is disconnected later than the main contact K1-1 when the air switch is opened, the current limiting function can be achieved when the air switch is opened, the air switch can be effectively protected when the air switch is opened and closed, and meanwhile the capacity of the air switch for disconnecting short-circuit current can be improved.
The current limiting resistor R1 can be designed into a resistor with a fixed resistance value or an adjustable resistor, so that the size of the current limiting resistor can be adjusted according to the sizes of components such as a secondary loop load capacitor, and the like, closing surge impact current can be well restrained, and the adaptability is good.
The current limiting resistor is also connected with an inductor L1 in series, so that the surge impact inhibiting effect is better. Not only is dc available, but also ac circuitry is applicable.
Although the invention has been described herein with reference to the above-described illustrative embodiments thereof, the above-described embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited by the above-described embodiments, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.
Claims (6)
1. An air switch structure for solving the problem of closing surge impact of an electric secondary circuit is characterized in that an auxiliary contact and a current limiting resistor are additionally arranged in or outside the air switch, the current limiting resistor is connected with the auxiliary contact in series and then connected with a main contact in parallel, the auxiliary contact is linked with the main contact of the air switch, and when the air switch is closed, the auxiliary contact is connected into the secondary circuit before the main contact.
2. The air switch structure for solving the problem of closing surge impact of an electric secondary circuit according to claim 1, wherein the current limiting resistor is an adjustable resistor.
3. The air switch structure for solving the problem of closing surge impact of an electric secondary circuit according to claim 1 or 2, wherein the current limiting resistor is further connected with an inductor in series.
4. A method for solving the problem of surge impact during closing of an electric secondary circuit is characterized in that an auxiliary contact and a current-limiting resistor are added to an air switch, the auxiliary contact is linked with a main contact of the air switch, the current-limiting resistor is connected in series with the auxiliary contact and then connected with the main contact in parallel, the auxiliary contact is used for connecting the current-limiting resistor into the secondary circuit to play a role in limiting surge impact current during closing, the auxiliary contact is connected into a charging element in the secondary circuit to limit current before the main contact is closed in the closing process of the air switch, and then the main contact is closed to short-circuit the auxiliary contact and the current-limiting resistor so that the auxiliary contact and the current-limiting resistor can be out of operation.
5. The method of claim 4, wherein the current limiting resistor is an adjustable resistor.
6. The method of claim 4 or 5, wherein the current limiting resistor is further connected in series with an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311407299.8A CN117334536A (en) | 2023-10-27 | 2023-10-27 | Air switch structure for solving closing surge impact of electric secondary circuit and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311407299.8A CN117334536A (en) | 2023-10-27 | 2023-10-27 | Air switch structure for solving closing surge impact of electric secondary circuit and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117334536A true CN117334536A (en) | 2024-01-02 |
Family
ID=89277236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311407299.8A Pending CN117334536A (en) | 2023-10-27 | 2023-10-27 | Air switch structure for solving closing surge impact of electric secondary circuit and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117334536A (en) |
-
2023
- 2023-10-27 CN CN202311407299.8A patent/CN117334536A/en active Pending
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