CN111863465A - Double-station circuit breaker, direct-current combined electrical apparatus applied to double-station circuit breaker and working method of double-station circuit breaker - Google Patents
Double-station circuit breaker, direct-current combined electrical apparatus applied to double-station circuit breaker and working method of double-station circuit breaker Download PDFInfo
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- CN111863465A CN111863465A CN202010711116.1A CN202010711116A CN111863465A CN 111863465 A CN111863465 A CN 111863465A CN 202010711116 A CN202010711116 A CN 202010711116A CN 111863465 A CN111863465 A CN 111863465A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a double-station circuit breaker, a direct-current combined electrical apparatus and a working method, wherein the double-station circuit breaker is provided with two groups of contacts, a static main contact and a dynamic main contact form a first contact group, and a first static auxiliary contact, a second static auxiliary contact and a dynamic auxiliary contact form a second contact group; the fuse breaks short-circuit current, the reverse charging switch is closed when an overload fault occurs, and the capacitor and the inductor generate reverse current to be injected into the double-station circuit breaker. The lightning arrester can limit the overvoltage generated in the switching-off process. The core of the invention is that the DC combined electrical apparatus using the double-station circuit breaker can realize the full-normal on-off of current, and two groups of contacts of the double-station circuit breaker are closed or opened simultaneously, when the load current, the on-off overload current and the short-circuit current are switched on and off, the operation can be completed only by one action, the operation process is simplified, the volume of the DC combined electrical apparatus is reduced, the cost of the DC combined electrical apparatus is reduced, and the stability of the system is improved.
Description
Technical Field
The invention relates to the technical field of direct-current switching appliances, in particular to a double-station circuit breaker, a direct-current combined appliance using the same and a working method of the direct-current combined appliance.
Background
At present, urban rail transit in China is rapidly developed, the capacity of a direct-current traction system is continuously increased, short-circuit fault current of the system reaches hundreds of kiloamperes within milliseconds, and the reliability of the direct-current traction system is seriously threatened. The direct current breaker is an important guarantee for solving the problems of rapid removal and reliable isolation of short-circuit faults of a direct current traction system and improving the reliability of the system. In addition, the short-circuit current in the rail transit system can reach more than 100kA, which is a very big challenge for the breaking capability of the direct current circuit breaker.
Patent document CN108270198A discloses a dc combined switch apparatus, in which a main circuit is composed of two parallel circuits, a first branch is composed of a power electronic device and a dc fuse connected in series, and a second branch is composed of a dc mechanical switch alone. However, this solution has significant drawbacks in dc systems with excessive short-circuit current. In the scheme, the power electronic switch and the fuse are in the same branch, short-circuit current needs to flow through the power electronic switch, and then the fuse cuts off the short-circuit current, so that the power electronic switch is easy to damage by the short-circuit current, and economic loss is caused. The direct current combined switch electric appliance needs a power electronic switch, and the cost is higher.
Patent document CN207966846U discloses an interlocking vacuum switch and a series compensation current limiting device applied thereto, wherein the vacuum switch adopts an interlocking vacuum arc-extinguishing chamber, and selects a fast repulsion mechanism to cooperate with the interlocking vacuum arc-extinguishing chamber, so as to realize fast switching of two different functions of series compensation and current limiting of the series compensation current limiting device. However, the interlocking vacuum switch in this scheme is not essentially a switch in which two sets of contacts are simultaneously closed or opened, and cannot be applied to a dc combined electrical apparatus requiring two sets of contacts to be simultaneously closed or opened.
Patent document CN109774481A discloses a power battery protection device for an electric vehicle and a working method thereof, wherein a main loop of the protection device is composed of four branches, a first branch is composed of a power electronic switch alone, a second branch is composed of a direct current fuse alone, a third branch and a fourth branch are composed of a direct current mechanical switch alone, wherein two branches i and iii are connected in parallel and then connected in series with the parallel branches ii and iv; the control circuit is provided with a current detection control module for detecting the current state in the main circuit and controlling the on-off of each switch, thereby realizing different on-off logics. The protection device can exert the switching-on and switching-off advantages of various switches in different fault current ranges, realizes the reliable breaking of fault current in the direct current application fields of electric vehicles and the like, and replaces the existing protection strategy. The topological structure in the scheme is different from that of the invention, the scheme uses a power electronic switch to cut off the overload current, the invention uses a double-station circuit breaker to cut off the overload current, and a first moving contact and a first static contact of the double-station circuit breaker select longitudinal magnetic field contacts, such as a cup-shaped longitudinal magnetic contact, a coil-type longitudinal magnetic contact, a horseshoe-shaped longitudinal magnetic contact and the like; the second moving contact and the second static contact adopt transverse magnetic field contacts, such as spiral groove type contacts, cup-shaped transverse magnetic contacts, swastika-shaped contacts and the like, and the energy absorption device is additionally arranged to limit overvoltage in the switching-on and switching-off process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the double-station circuit breaker, the direct current combined electrical appliance applied by the double-station circuit breaker and the working method of the double-station circuit breaker, so that various fault currents in the rail transit direct current traction system can be switched off, and the problems that the conventional rail transit direct current traction system needs a direct current circuit breaker with the advantages of full-range switching-off fault current, large switching-off capacity, low price and small size are solved.
The invention solves the problems through the following technical means:
a double-station circuit breaker comprises a static contact part, a moving contact part and an insulating shell 1; the static contact part comprises a static conductive rod 2, a static main contact 3, a first static auxiliary contact 6 and a second static auxiliary contact 9, the upper end of the static conductive rod 2 is hermetically connected with the upper part of the insulating shell 1 and penetrates out of the insulating shell 1, the lower end of the static conductive rod 2 is connected with the static main contact 3, the first static auxiliary contact 6 is arranged on one side of the insulating shell 1 and fixed in the middle of the insulating shell 1 and penetrates out, the second static auxiliary contact 9 is arranged on the other side of the insulating shell 1 and fixed in the middle of the insulating shell 1 and penetrates out, and the first static auxiliary contact 6 and the second static auxiliary contact 9 are symmetrically arranged; the movable contact part comprises a movable main contact 4, a movable conducting rod 5 and a movable auxiliary contact 7, the upper end of the movable conducting rod 5 is connected with the movable main contact 4, and the middle part of the movable conducting rod 5 is connected with the movable auxiliary contact 7 in an insulating way; in the double-station circuit breaker, a static main contact 3 and a dynamic main contact 4 form a first contact group, and a first static auxiliary contact 6, a second static auxiliary contact 9 and a dynamic auxiliary contact 7 form a second contact group; the lower end of the movable conducting rod 5 is connected with the lower part of the insulating shell 1 through a corrugated pipe 8.
The static main contact 3 and the dynamic main contact 4 adopt longitudinal magnetic field contacts.
The longitudinal magnetic field contact adopts a cup-shaped longitudinal magnetic contact, a coil-type longitudinal magnetic contact or a horseshoe-shaped longitudinal magnetic contact.
The first static auxiliary contact 6, the second static auxiliary contact 9 and the moving auxiliary contact 7 adopt transverse magnetic field contacts.
The transverse magnetic field contact adopts a spiral groove type contact, a cup-shaped transverse magnetic contact or a swastika-shaped contact.
A direct current combined electrical apparatus using a double-station circuit breaker comprises a wire inlet end 1 ', a wire outlet end 2', a fuse 3 ', a capacitor 4', an inductor 5 ', a reverse charging switch 6', a lightning arrester 7 'and the double-station circuit breaker 8'; the fuse 3 ', the capacitor 4', the inductor 5 'and the reverse charging switch 6' are sequentially connected in series to form a main branch circuit, the inlet end of the fuse 3 'is connected with the wire inlet end 1' and the first static auxiliary contact 6, the outlet end of the reverse charging switch 6 'is connected with the wire outlet end 2' and the movable conducting rod 5, the static main contact 2 and the second static auxiliary contact 9 are both connected between the fuse 3 'and the capacitor 4', one end of the lightning arrester 7 'is connected between the fuse 3' and the capacitor 4 ', and the other end is connected with the outlet end of the reverse charging switch 6'; the capacitor 4 ' and the inductor 5 ' are used for generating high-frequency oscillation current, the reverse charging switch 6 ' is used for controlling the injection of the high-frequency oscillation current, the fuse 3 ' is used for breaking short-circuit current, and the lightning arrester 7 ' is used for limiting overvoltage generated in the breaking process.
The fuse 3' adopts a direct current fuse.
The lightning arrester 7' adopts a zinc oxide lightning arrester or a piezoresistor.
According to the working method of the direct current combined electrical apparatus using the double-station circuit breaker, when the direct current combined electrical apparatus normally operates, the first contact group and the second contact group are closed, current flows in from the wire inlet end 1 ', passes through the second contact group and the first contact group, and flows out from the wire outlet end 2'; when the direct current combined electrical apparatus is required to cut off normal working current, the double-station circuit breaker acts, and the first contact group and the second contact group are opened to cut off the current at the same time;
when the line has an overload fault, the double-station circuit breaker acts, the first contact group and the second contact group are opened at the same time, the reverse charging switch 6 ' is closed, high-frequency current is generated by the capacitor 4 ' and the inductor 5 ', the current flowing through the double-station circuit breaker is forced to zero, the reverse charging switch 6 ' is opened after the current zero-crossing, the double-station circuit breaker extinguishes electric arcs to cut off the current, and the lightning arrester 7 ' limits overvoltage and absorbs the overvoltage generated in the cutting-off process;
when a short-circuit fault occurs to a line, the double-station circuit breaker acts, the first contact group and the second contact group are opened simultaneously, short-circuit current passes through the fuse 3 ', the fuse 3' acts to cut off the current, when the fuse 3 'cannot independently extinguish arc, the current limiting function is achieved, the double-station circuit breaker extinguishes electric arc, the short-circuit fault current is cut off, and the lightning arrester 7' limits overvoltage and absorbs overvoltage generated in the cut-off process.
The invention has the following beneficial effects:
1. the double-station circuit breaker uses a single arc extinguish chamber, the two groups of contacts are closed or opened simultaneously, and when the direct current combined electrical appliance using the double-station circuit breaker is used for switching on and off various currents, the operation can be completed only by one action, so that the operation process is simplified, the size of the direct current combined electrical appliance is reduced, the cost of the direct current combined electrical appliance is reduced, and the stability of the system is improved.
2. The double-station circuit breaker is used for closing and breaking load current, the reverse charging branch circuit assists the double-station circuit breaker to break overload current and the direct current fuse to break short-circuit current, and therefore reliable and rapid breaking of various currents in a circuit can be achieved, and safety of electric equipment is protected.
3. The advantages of corresponding fault current when various switches are switched on and off are fully exerted, the risk that overload current capacity of the direct current fuse is not high when the direct current fuse is switched on and off is avoided, and misoperation of the direct current fuse is prevented.
4. Load current passes through the duplex position circuit breaker when the circuit normally works, can reduce the energy loss of current through the fuse.
Drawings
Fig. 1 is a schematic diagram of a double-station circuit breaker and a direct-current combined electrical apparatus using the same during normal operation.
Fig. 2 is a circuit diagram of the overload current breaking of the double-station circuit breaker and the applied direct current combined electrical apparatus.
Fig. 3 is a circuit diagram of the double-station circuit breaker and the applied dc combined electrical appliance for breaking the short-circuit current.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in the attached figure 1, the double-station circuit breaker of the invention comprises a static contact part, a moving contact part and an insulating shell 1; the static contact part comprises a static conductive rod 2, a static main contact 3, a first static auxiliary contact 6 and a second static auxiliary contact 9, the upper end of the static conductive rod 2 is hermetically connected with the upper part of the insulating shell 1 and penetrates out of the insulating shell 1, the lower end of the static conductive rod 2 is connected with the static main contact 3, the first static auxiliary contact 6 is arranged on one side of the insulating shell 1 and fixed in the middle of the insulating shell 1 and penetrates out, the second static auxiliary contact 9 is arranged on the other side of the insulating shell 1 and fixed in the middle of the insulating shell 1 and penetrates out, and the first static auxiliary contact 6 and the second static auxiliary contact 9 are symmetrically arranged; the movable contact part comprises a movable main contact 4, a movable conducting rod 5 and a movable auxiliary contact 7, the upper end of the movable conducting rod 5 is connected with the movable main contact 4, and the middle part of the movable conducting rod 5 is connected with the movable auxiliary contact 7 in an insulating way; in the double-station circuit breaker, a static main contact 3 and a dynamic main contact 4 form a first contact group, and a first static auxiliary contact 6, a second static auxiliary contact 9 and a dynamic auxiliary contact 7 form a second contact group; the lower end of the movable conducting rod 5 is connected with the lower part of the insulating shell 1 through a corrugated pipe 8.
As a preferred embodiment of the present invention, the static main contact 3 and the dynamic main contact 4 adopt longitudinal magnetic field contacts.
More preferably, the longitudinal magnetic field contact adopts a cup-shaped longitudinal magnetic contact, a coil-type longitudinal magnetic contact or a horseshoe-shaped longitudinal magnetic contact.
In a preferred embodiment of the present invention, the first stationary auxiliary contact 6, the second stationary auxiliary contact 9 and the moving auxiliary contact 7 are transverse magnetic field contacts.
More preferably, the transverse magnetic field contact adopts a spiral slot type contact, a cup-shaped transverse magnetic contact or a swastika contact.
The invention relates to a direct current combined electrical apparatus using a double-station circuit breaker, which comprises a wire inlet end 1 ', a wire outlet end 2', a fuse 3 ', a capacitor 4', an inductor 5 ', a reverse charging switch 6', a lightning arrester 7 'and the double-station circuit breaker 8'; the fuse 3 ', the capacitor 4', the inductor 5 'and the reverse charging switch 6' are sequentially connected in series to form a main branch circuit, the inlet end of the fuse 3 'is connected with the wire inlet end 1' and the first static auxiliary contact 6, the outlet end of the reverse charging switch 6 'is connected with the wire outlet end 2' and the movable conducting rod 5, the static main contact 2 and the second static auxiliary contact 9 are both connected between the fuse 3 'and the capacitor 4', one end of the lightning arrester 7 'is connected between the fuse 3' and the capacitor 4 ', and the other end is connected with the outlet end of the reverse charging switch 6'; the capacitor 4 ' and the inductor 5 ' are used for generating high-frequency oscillation current, the reverse charging switch 6 ' is used for controlling the injection of the high-frequency oscillation current, the fuse 3 ' is used for breaking short-circuit current, and the lightning arrester 7 ' is used for limiting overvoltage generated in the breaking process.
In a preferred embodiment of the present invention, the fuse 3' is a dc fuse.
In a preferred embodiment of the present invention, the lightning arrester 7' is a zinc oxide lightning arrester or a varistor.
The rated load operation state of the dc combined electrical appliance using the two-station circuit breaker provided by the embodiment is described in detail below. As shown in fig. 1, when the dc combined electrical apparatus normally operates, the first contact group and the second contact group are closed, and current flows in from the incoming line terminal 1 ', passes through the second contact group and the first contact group, and flows out from the outgoing line terminal 2'; when the direct current combined electrical apparatus needs to cut off normal operating current, the double-station circuit breaker acts, and the first contact group and the second contact group are opened simultaneously to cut off the current.
The working process of breaking the overload current of the double-station circuit breaker and the applied direct-current combined electrical apparatus provided by the embodiment is described in detail below. As shown in fig. 2, when an overload fault occurs in a line, the double-station circuit breaker acts, the first contact group and the second contact group are opened at the same time, the reverse charging switch 6 ' is closed, high-frequency current is generated by the capacitor 4 ' and the inductor 5 ', the current flowing through the double-station circuit breaker is forced to pass through zero, the reverse charging switch 6 ' is opened after the current passes through zero, the double-station circuit breaker extinguishes electric arcs to cut off the current, and the lightning arrester 7 ' limits overvoltage and absorbs the overvoltage generated in the cutting-off process.
The working process of breaking the short-circuit current of the double-station circuit breaker and the applied direct-current combined electrical apparatus provided by the embodiment is described in detail below. As shown in fig. 3, when a short-circuit fault occurs in a line, the double-station circuit breaker operates, the first contact group and the second contact group are opened simultaneously, short-circuit current passes through the fuse 3 ', the fuse 3 ' operates to cut off the current, the fuse 3 ' can play a role in limiting the current when the fuse 3 ' cannot independently extinguish the arc, the double-station circuit breaker extinguishes the arc, the short-circuit fault current is cut off, and the lightning arrester 7 ' limits overvoltage and absorbs the overvoltage generated in the cutting process.
Claims (9)
1. A double-station circuit breaker is characterized in that: the double-station circuit breaker is composed of a static contact part, a movable contact part and an insulating shell (1);
the static contact part comprises a static conductive rod (2), a static main contact (3), a first static auxiliary contact (6) and a second static auxiliary contact (9), the upper end of the static conductive rod (2) is hermetically connected with the upper part of the insulating shell (1) and penetrates out of the insulating shell (1), the lower end of the static conductive rod (2) is connected with the static main contact (3), the first static auxiliary contact (6) is arranged on one side of the insulating shell (1) and fixed in the middle of the insulating shell (1) and penetrates out, the second static auxiliary contact (9) is arranged on the other side of the insulating shell (1) and fixed in the middle of the insulating shell (1) and penetrates out, and the first static auxiliary contact (6) and the second static auxiliary contact (9) are symmetrically arranged;
The movable contact part comprises a movable main contact (4), a movable conducting rod (5) and a movable auxiliary contact (7), the upper end of the movable conducting rod (5) is connected with the movable main contact (4), and the middle part of the movable conducting rod (5) is connected with the movable auxiliary contact (7) in an insulating way; in the double-station circuit breaker, a static main contact (3) and a dynamic main contact (4) form a first contact group, and a first static auxiliary contact (6), a second static auxiliary contact (9) and a dynamic auxiliary contact (7) form a second contact group; the lower end of the movable conducting rod (5) is connected with the lower part of the insulating shell (1) through a corrugated pipe (8).
2. The double-station circuit breaker according to claim 1, characterized in that: the static main contact (3) and the dynamic main contact (4) adopt longitudinal magnetic field contacts.
3. The double-station circuit breaker according to claim 2, characterized in that: the longitudinal magnetic field contact adopts a cup-shaped longitudinal magnetic contact, a coil-type longitudinal magnetic contact or a horseshoe-shaped longitudinal magnetic contact.
4. The double-station circuit breaker according to claim 1, characterized in that: the first static auxiliary contact (6), the second static auxiliary contact (9) and the moving auxiliary contact (7) adopt transverse magnetic field contacts.
5. The double-station circuit breaker according to claim 4, characterized in that: the transverse magnetic field contact adopts a spiral groove type contact, a cup-shaped transverse magnetic contact or a swastika-shaped contact.
6. The utility model provides an use DC combined electrical apparatus of duplex position circuit breaker which characterized in that: the direct current combined electrical apparatus comprises a wire inlet end (1 '), a wire outlet end (2'), a fuse (3 '), a capacitor (4'), an inductor (5 '), a reverse charging switch (6'), a lightning arrester (7 ') and the double-station circuit breaker (8') of claim 1;
the fuse protector (3 '), the capacitor (4'), the inductor (5 ') and the reverse charging switch (6') are sequentially connected in series to form a main branch circuit, the inlet end of the fuse protector (3 ') is connected with the wire inlet end (1') and the first static auxiliary contact (6), the outlet end of the reverse charging switch (6 ') is connected with the wire outlet end (2') and the movable conducting rod (5), the static main contact (2) and the second static auxiliary contact (9) are both connected between the fuse protector (3 ') and the capacitor (4'), one end of the lightning arrester (7 ') is connected between the fuse protector (3') and the capacitor (4 '), and the other end of the lightning arrester is connected with the outlet end of the reverse charging switch (6');
the capacitor (4 ') and the inductor (5 ') are used for generating high-frequency oscillation current, the reverse charging switch (6 ') is used for controlling the injection of the high-frequency oscillation current, the fuse (3 ') is used for switching off short-circuit current, and the lightning arrester (7 ') is used for limiting overvoltage generated in the switching-off process.
7. The direct current combined electrical apparatus using the double-station circuit breaker according to claim 6, wherein: the fuse (3') is a direct current fuse.
8. The direct current combined electrical apparatus using the double-station circuit breaker according to claim 6, wherein: the lightning arrester (7') adopts a zinc oxide lightning arrester or a piezoresistor.
9. The operating method of the direct current combined electrical apparatus using the double-station circuit breaker according to claim 6, characterized in that: when the direct current combined electrical apparatus normally operates, the first contact group and the second contact group are closed, current flows in from the wire inlet end (1 '), passes through the second contact group and the first contact group, and flows out from the wire outlet end (2'); when the direct current combined electrical apparatus is required to cut off normal working current, the double-station circuit breaker acts, and the first contact group and the second contact group are opened to cut off the current at the same time;
when the line has an overload fault, the double-station circuit breaker acts, the first contact group and the second contact group are opened at the same time, the reverse charging switch (6 ') is closed, high-frequency current is generated by the capacitor (4 ') and the inductor (5 '), the current flowing through the double-station circuit breaker is forced to pass through zero, the reverse charging switch (6 ') is opened after the current passes through zero, the double-station circuit breaker extinguishes electric arcs to cut off the current, and the lightning arrester (7 ') limits overvoltage and absorbs the overvoltage generated in the cutting-off process;
when a short-circuit fault occurs to a line, the double-station circuit breaker acts, the first contact group and the second contact group are opened simultaneously, short-circuit current passes through the fuse (3 '), the fuse (3') acts to cut off the current, when the fuse (3 ') cannot independently extinguish the arc, the current limiting function is achieved, the double-station circuit breaker extinguishes the arc, the short-circuit fault current is cut off, and the lightning arrester 7' limits overvoltage and absorbs the overvoltage generated in the cutting process.
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| CN202010711116.1A CN111863465B (en) | 2020-07-22 | 2020-07-22 | Double-station circuit breaker, direct-current combined electrical apparatus applying same and working method |
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| CN113161192A (en) * | 2021-04-22 | 2021-07-23 | 云南电网有限责任公司电力科学研究院 | Magnetic field enhanced vacuum circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161192A (en) * | 2021-04-22 | 2021-07-23 | 云南电网有限责任公司电力科学研究院 | Magnetic field enhanced vacuum circuit breaker |
| CN117498284A (en) * | 2023-10-26 | 2024-02-02 | 武汉大学 | Series compensation capacitor device based on short-circuit fault current intelligent self-driving |
| CN117498284B (en) * | 2023-10-26 | 2024-04-05 | 武汉大学 | Series compensation capacitor device based on short-circuit fault current intelligent self-driving |
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