CN220895443U - Direct current breaker - Google Patents
Direct current breaker Download PDFInfo
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- CN220895443U CN220895443U CN202322532212.1U CN202322532212U CN220895443U CN 220895443 U CN220895443 U CN 220895443U CN 202322532212 U CN202322532212 U CN 202322532212U CN 220895443 U CN220895443 U CN 220895443U
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- 238000005265 energy consumption Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000002788 crimping Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 description 16
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000012212 insulator Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The utility model belongs to the technical field of mechanical direct current breakers, and particularly relates to a direct current breaker. The utility model selects different transfer branches in the transfer branch according to the current of the main branch to participate in switching on and off, and finally reduces the current to zero through the energy consumption branch so as to finish switching on and off, thereby meeting the requirements of high-efficiency transfer of the current of the main branch.
Description
Technical Field
The utility model belongs to the technical field of mechanical direct current breakers, and particularly relates to a direct current breaker.
Background
The direct current transmission has the advantages of large transmission capacity, long transmission distance, good economic benefit and the like, green energy sources such as solar energy, wind energy and the like are vigorously developed, and along with the large-scale grid connection of the green energy sources, the demands of China on direct current distribution equipment are increasingly urgent. Because the short-circuit current of the direct current power grid rises fast, the peak value is high, and no natural zero crossing point exists, the direct current breaker needs to be connected, carried and disconnected with the rated current of the system in a normal working state; when a short circuit fault occurs, the fault branch can be rapidly cut off, the inductance energy stored in the system can be absorbed, and the overvoltage of the system can be restrained. According to the topological structure, the direct current circuit breaker can be classified into a mechanical type, a hybrid type and a solid type, wherein the mechanical direct current circuit breaker is widely applied to a direct current power grid due to the advantages of low conduction loss, strong breaking capacity, low cost and the like.
The invention patent application of China with the publication number of CN107171278A discloses a zero voltage direct current breaker and a method for inputting and segmenting, which utilize the negative impedance characteristic of a mechanical switch arc, and the negative impedance characteristic of a parallel inductance-capacitance circuit is utilized to resonate to create a current zero crossing point arc-quenching, so that the control is simple, the reliability of a loop is high, but the problem is that the forward amplitude of superimposed current is increased by at least 1 time before zero crossing is generated, the difficulty of opening the current of the direct current breaker is increased, the arc generated when the direct current breaker is broken is possibly larger, and the service life of the direct current breaker is directly influenced; in addition, the arcing time between the direct current breaker breaks is easy to be overlong, so that important current carrying parts such as contacts and the like are burnt, and serious electric accidents are caused.
Disclosure of utility model
The utility model aims to provide a direct current breaker which is used for solving the problems that in the prior art, in order to realize the zero crossing of the current of a main current loop, the superimposed reverse current is overlarge, so that larger electric arcs are generated, important current carrying parts are damaged, and thus, electric accidents are caused.
In order to solve the technical problems, the utility model provides a direct current breaker which comprises a main branch, a transfer branch and an energy consumption branch which are arranged in parallel, wherein a first quick mechanical switch is arranged on the main branch in series, and two transfer branch branches which are arranged in parallel are connected with a transfer capacitor in series and then are arranged on the transfer branch in series.
The beneficial effects are as follows: in order to solve the problems that in the prior art, in order to realize the current zero crossing point of a main current branch, the superimposed reverse current is overlarge, so that larger electric arcs are generated, important current carrying parts are damaged, and electric accidents are caused, different branch branches in the branch branches are selected to participate in switching on and off according to the current of the main branch, and the requirement of efficiently transferring the current of the main branch is met, so that the direct current circuit breaker has the characteristics of small volume, high automation degree, good reliability, low cost and long service life, and has very high engineering application value and economic benefit.
Further, the two transfer branches are a first transfer branch and a second transfer branch respectively, and a first inductor and a first switch combined crimping piece are arranged on the first transfer branch in series; the second transfer branch is connected with a second inductor and a second switch combined crimping piece in series; wherein the first inductance is greater than the second inductance.
Further, the first switch assembly crimp and the second switch assembly crimp each include two transfer leg control switches, and the two transfer leg control switches are arranged in anti-parallel.
The beneficial effects are as follows: the direct current circuit breaker can be opened and closed under bidirectional current.
Further, the transfer branch control switch is a thyristor.
The beneficial effects are as follows: the thyristor is used as a switch for controlling the transfer branch, so that the on/off of the transfer branch is controlled to be quicker and more stable, the requirement of efficiently transferring the main branch current is met, and the direct current circuit breaker has the characteristics of high automation degree and good reliability.
Further, the magnetic blow-out coil is formed by any one of the following modes: a single inductor, multiple inductors connected in series, multiple inductors connected in parallel, and multiple inductors connected in series and parallel.
Further, a second quick mechanical switch is connected in series on the main support.
Drawings
Fig. 1 is a schematic diagram of the mechanical structure of a dc breaker of the present utility model;
fig. 2 is a schematic mechanical structure of a main switch module of the dc breaker of the present utility model;
Fig. 3 is a schematic diagram of a mechanical structure of a current transfer module of the dc breaker of the present utility model;
FIG. 4 is a schematic diagram of the mechanical structure of a thyristor assembly crimp in a current transfer module of the utility model;
Fig. 5 is a schematic diagram of the circuit topology of the dc breaker of the present utility model.
The intelligent power supply comprises a 1-main switch module, a 2-energy dissipation module, a 3-current transfer module intelligent, a 4-energy control module, a 5-contact base, a 6-common solid sealing pole, a 7-magnetic control resonance solid sealing pole, an 8-handcart box body, a 9-repulsive force mechanism, a 10-handcart chassis, an 11-roller, a 12-connecting plate, a 13-magnetic blowing coil, a 14-transfer capacitor, a 15-first inductor, a 16-second inductor, a 17-first thyristor combined crimping piece, a 18-second thyristor combined crimping piece, a 19-cable, a 20-power module, a 21-triggering module, a 22-insulating plate, a 23-fixing plate, a 24-screw rod, a 25-insulator, a 26-thyristor first negative pole outlet plate, a 27-thyristor positive common end outlet plate, a 28-thyristor second negative pole outlet plate, a 29-supporting plate, a 30-insulator, a 31-thyristor first and a 32-thyristor second.
Detailed Description
The basic idea of the utility model is as follows: the magnetic blowing discharge loop utilizes a high-frequency magnetic field generated by a magnetic control oscillation principle to act on a vacuum arc, so that the arc voltage is unstable, current oscillates and crosses zero in a main branch and a transfer branch, meanwhile, according to the current of the main branch, different transfer branches in the transfer branch are selected to participate in breaking by utilizing an intelligent controller, and finally, the energy stored in the system is consumed through an energy consumption branch, so that the current is reduced to zero, and the breaking is completed.
The utility model will be described in detail below with reference to the drawings and examples of methods.
Dc breaker embodiment:
The utility model relates to a direct current breaker, the mechanical structure of which is shown in figure 1, comprising: the intelligent power supply device comprises a main switch module 1, an energy dissipation module 2, a current transfer module 3 and an intelligent control module 4, wherein the main switch module is positioned in a breaker chamber at the left lower part of a cabinet body, the energy dissipation module is positioned in a high-voltage chamber at the right lower part of the cabinet body, the current transfer module is positioned in the high-voltage chamber at the right upper part of the cabinet body, and the intelligent control module is positioned in an instrument chamber at the left upper part of the cabinet body.
As shown in fig. 2, the main switch module belongs to a fast mechanical switch handcart, and the mechanical structure of the main switch module specifically comprises: the magnetic resonance type hand cart comprises a contact base 5, a common solid sealed pole 6, a magnetic resonance type solid sealed pole 7, a cart box 8, a repulsive force mechanism 9, a cart chassis 10, rollers 11, a connecting plate 12 and a magnetic blowing coil 13; wherein the handcart box 8 is positioned at the front part of the handcart, and a charging loop and a triggering loop for the repulsive force mechanism 9 to act are positioned in the handcart box; the common solid-sealed polar pole 6 and the magnetic control resonance type solid-sealed polar pole 7 are connected in series through a connecting plate 12 and positioned at the upper part of the repulsive force mechanism 9, a plum blossom contact is arranged in the contact seat 5 and can be inserted into a contact box positioned in a high-voltage chamber, the outlet of the contact box connected with the common solid-sealed polar pole 6 is upward and connected with a bus through a copper bar, and the outlet of the contact box connected with the magnetic control resonance type solid-sealed polar pole 7 is downward and connected with an outgoing cable through a copper bar; the repulsive force mechanism 9 and the handcart box body 8 are positioned at the upper part of the handcart chassis 10, and the idler wheels 11 are positioned in the handcart chassis 10; the two magnetic blowing coils 13 are fixedly sealed in the magnetic control resonance solid sealing polar pole 7 and are positioned at the side part of the fracture of the vacuum arc extinguishing chamber and symmetrically arranged; the two magnetic blowing coils 13 are connected in parallel and then connected into a magnetic blowing capacitor discharging loop.
As shown in fig. 3, the current transfer module includes a transfer capacitor 14 and two parallel branches, wherein one branch is formed by connecting a first inductor (L1) 15 and a first thyristor combination crimp 17 (switch combination crimp) in series, and the other branch is formed by connecting a second inductor (L2) 16 and a second thyristor combination crimp 18 in series; the first and second thyristor assemblies crimp 17 and 18 are identical in internal structure and are each connected to the energy dissipating lightning arrester by a cable 19.
As shown in fig. 4, the thyristor assembly crimping component is formed by crimping thyristors in anti-parallel connection, and specifically includes: the power supply module 20, the trigger module 21, the insulating plate 22, the fixed plate 23, the screw 24, the insulator 25, the first negative electrode outlet plate 26 of the thyristor, the common end outlet plate 27 of the positive electrode of the thyristor, the second negative electrode outlet plate 28 of the thyristor, the supporting plate 29, the insulator 30, the first thyristor 31 and the second thyristor 32; the support plate 29, the insulator 30, the thyristor two-cathode outlet plate 28, the thyristor two 32, the thyristor common end outlet plate 27, the thyristor one 31, the thyristor one-cathode outlet plate 26, the insulator 25 and the fixed plate 23 are sequentially overlapped and are pressed by four screws 24; the power supply module 20 and the trigger module 21 are isolated from the thyristor by an insulating plate 22; the thyristor one-cathode outlet plate 26 and the thyristor two-cathode outlet plate 27 are connected through cables.
The circuit topology diagram of the direct current breaker is shown in fig. 5, and the circuit topology diagram comprises a magnetic blowing discharging loop, a main branch, a transfer branch and an energy consumption branch, wherein the magnetic blowing discharging loop is formed by connecting a pre-charged magnetic blowing capacitor C2, a magnetic blowing coil L3 and a thyristor T3 in series, and the magnetic blowing capacitor C2 and the thyristor T3 are positioned in a handcart box; the main branch consists of a quick mechanical switch CB1 and a quick mechanical switch CB2, and further comprises a current sensor for collecting the current on the main branch; the transfer branch is formed by connecting a first transfer branch and a second transfer branch in parallel and then connecting the transfer branch with a transfer capacitor C1 in series, the first transfer branch is formed by connecting a thyristor T11 and a thyristor T12 in reverse parallel and then connecting the transfer branch with a first inductor L1 in series, and the second transfer branch is formed by connecting a thyristor T21 and a thyristor T22 in reverse parallel and then connecting the transfer branch with a second inductor L2 in series; the energy consumption branch comprises an energy consumption lightning arrester, and the energy consumption branch is connected in parallel with the main branch and the transfer branch; the magnetic blowing coil can be formed by connecting a single inductor or a plurality of inductors in series, in parallel and in series-parallel; the first inductance L1 is greater than the second inductance L2.
The principle of the direct current breaker for switching on and off the direct current specifically comprises (current flows from an outgoing line end A to an outgoing line end B):
1) When the rated direct current is cut off, the breaker receives a brake-off instruction at the moment t 0, the intelligent control module 4 sends brake-off signals to the quick mechanical switches CB1 and CB2, and after mechanical delay of hundreds of microseconds, the quick mechanical switch starts to act at the moment t 1 to pull the moving contact of the vacuum arc-extinguishing chamber open; after the fracture is pulled apart for a certain distance, the thyristors T3 and T12 are conducted at the time T 2, the pre-charged magnetic blowing capacitor C2 discharges to the magnetic blowing coil L3, the high-frequency magnetic field generated by discharge causes unstable arc voltage in the main branch, current oscillates in the main branch and the first transfer branch, the current crosses zero at the fracture after a plurality of periods of oscillation, the arc is extinguished, and the system current is completely transferred from the main branch to the first transfer branch; the current transferred to the first transfer branch starts to charge the transfer capacitor C1, the voltage of the transfer capacitor C1 is gradually increased and applied to the interruptions CB1 and CB2, when the voltage of the transfer capacitor reaches the threshold value of the MOV, the MOV is conducted, the system current flows through the energy consumption branch from the first transfer branch, the MOV consumes the energy stored in the system, and finally the current is reduced to zero to finish the switching.
2) When the short-circuit direct current is switched on and off, the breaker receives a switching-off instruction at the moment t 3, the intelligent control module 4 sends switching-off signals to the quick mechanical switches CB1 and CB2, and the quick mechanical switch starts to act to pull the moving contact of the vacuum arc-extinguishing chamber at the moment t 4 after mechanical delay of hundreds of microseconds; after a fracture is pulled apart for a certain distance, the thyristors T3 and T22 are turned on at the moment T 5, the pre-charged magnetic blowing capacitor C2 discharges to the magnetic blowing coil L3, the high-frequency magnetic field generated by discharge causes unstable arc voltage in the main branch, current oscillates in the main branch and the second transfer branch, the current crosses zero at the fracture after oscillation for a plurality of periods, the arc is extinguished, and the system current is completely transferred from the main branch to the second transfer branch; the current transferred to the second transfer branch starts to charge the transfer capacitor C1, the voltage of the transfer capacitor C1 gradually rises and is applied to the interruptions CB1 and CB2, when the transfer capacitor voltage reaches the threshold of the MOV, the MOV is turned on and the system current flows from the second transfer branch through the energy consuming branch. The MOV consumes the energy stored in the system and eventually the current drops to zero, completing the switch-off.
The direct current breaker can complete bidirectional current breaking (namely, current can flow from the wire outlet end B to the wire outlet end A).
The utility model has the advantages of modularized structural design, complete functions, safe and reliable equipment, monitoring the current of the main branch by the current sensor, selecting different branch transfer branches in the branch transfer by the intelligent controller for breaking, taking part in breaking the rated direct current by the first branch transfer branch, taking part in breaking the short-circuit direct current by the second branch transfer branch, meeting the requirement of high-efficiency transfer of the current of the main path, having the characteristics of small volume, high automation degree, low cost and long service life, and having higher engineering application value and economic benefit.
Claims (6)
1. The direct current breaker comprises a main branch, a transfer branch and an energy consumption branch which are arranged in parallel, wherein a first quick mechanical switch is arranged on the main branch in series, and two transfer branches which are arranged in parallel are connected with a transfer capacitor in series and then are arranged on the transfer branch in series.
2. The direct current breaker according to claim 1, wherein the two transfer branches are a first transfer branch and a second transfer branch, respectively, and the first transfer branch is connected in series with a first inductor and a first switch combined crimping member; the second transfer branch is connected with a second inductor and a second switch combined crimping piece in series; wherein the first inductance is greater than the second inductance.
3. The direct current circuit breaker according to claim 2, wherein the first switch assembly crimp and the second switch assembly crimp each comprise two transfer leg control switches, and the two transfer leg control switches are arranged antiparallel.
4. A direct current breaker according to claim 3, characterized in that the transfer branch control switch is a thyristor.
5. The direct current breaker according to claim 1, characterized in that the magnetic blow-out coil is composed in any one of the following ways: a single inductor, multiple inductors connected in series, multiple inductors connected in parallel, and multiple inductors connected in series and parallel.
6. The direct current breaker according to claim 1, characterized in that a second fast mechanical switch is also connected in series on the main branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322532212.1U CN220895443U (en) | 2023-09-18 | 2023-09-18 | Direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322532212.1U CN220895443U (en) | 2023-09-18 | 2023-09-18 | Direct current breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220895443U true CN220895443U (en) | 2024-05-03 |
Family
ID=90839932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322532212.1U Active CN220895443U (en) | 2023-09-18 | 2023-09-18 | Direct current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220895443U (en) |
-
2023
- 2023-09-18 CN CN202322532212.1U patent/CN220895443U/en active Active
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