CN220985370U - Ground electrified automatic neutral-section passing main wiring system - Google Patents
Ground electrified automatic neutral-section passing main wiring system Download PDFInfo
- Publication number
- CN220985370U CN220985370U CN202322462753.1U CN202322462753U CN220985370U CN 220985370 U CN220985370 U CN 220985370U CN 202322462753 U CN202322462753 U CN 202322462753U CN 220985370 U CN220985370 U CN 220985370U
- Authority
- CN
- China
- Prior art keywords
- circuit breaker
- switch
- voltage switch
- ground
- disconnector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007935 neutral effect Effects 0.000 claims abstract description 42
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 abstract description 3
- 238000005191 phase separation Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The utility model relates to the technical field of passing through phase separation, in particular to a ground electrification automatic passing through phase separation main wiring system, which comprises a third switching unit, wherein the third switching unit comprises a third circuit breaker and a sixth circuit breaker which is connected with the third circuit breaker in series, one end of the third circuit breaker is connected between a first high-voltage switch and a first isolating switch, the other end of the third circuit breaker is connected with one end of the sixth circuit breaker, the other end of the sixth circuit breaker is connected between a second high-voltage switch and a second isolating switch, and the third circuit breaker is connected with the third isolating switch; the third circuit breaker is connected with the first high-voltage switch in parallel, the sixth circuit breaker is connected with the second high-voltage switch in parallel, and the opening and closing of the third circuit breaker and the sixth circuit breaker can be used as a standby when the second high-voltage switch and the first high-voltage switch are in fault, so that the ground electrified automatic passing neutral section system power failure inspection and maintenance are avoided when the high-voltage switch is in fault, the structure is simple, and the cost is low.
Description
Technical Field
The utility model relates to the technical field of passing neutral section, in particular to a ground electrified automatic passing neutral section main wiring system.
Background
Referring to fig. 1, the existing ground electrification automatic passing neutral section main wiring system comprises an a-phase switching unit, a B-phase switching unit and a neutral section switching unit, wherein the a-phase switching unit comprises a first disconnecting switch 2-1 and a first high voltage switch 1-1, the B-phase switching unit comprises a second high voltage switch 1-2 and a second disconnecting switch 2-2, the third switching unit comprises a third disconnecting switch 2-3, the first disconnecting switch 2-1 is connected in series between the a-phase power supply arm 3-1 and the first high voltage switch 1-1, the second disconnecting switch 2-2 is connected in series between the second high voltage switch 1-2 and the B-phase power supply arm 3-2, one end of the third disconnecting switch 2-3 is connected between the first high voltage switch 1-1 and the second high voltage switch 1-2, and the other end of the third disconnecting switch 2-3 is connected with the neutral section 3-3.
The ground electrified automatic neutral-section passing system generally adopts a first high-voltage switch 1-1 and a second high-voltage switch 1-2 to realize power supply of a neutral zone 3-3 of an electrified railway contact net, and according to the running position of a train, the neutral zone 3-3 is electrically connected with an A-phase power supply arm 3-1 or the neutral zone 3-3 is electrically connected with a B-phase power supply arm 3-2 by controlling the opening and closing of the first high-voltage switch 1-1 and the second high-voltage switch 1-2.
In actual use, when the first high-voltage switch 1-1 and/or the second high-voltage switch 1-2 are/is in fault, the ground electrification automatic neutral section passing system can check and overhaul the high-voltage switch after the equipment is withdrawn from the ground electrification automatic neutral section passing system.
And when the standby mode is started for operation, if the standby high-voltage switch fails, the ground electrified automatic passing neutral section system must be withdrawn from operation, which causes that the train on the road cannot run as expected and further influences the normal operation of the railway.
Disclosure of utility model
The utility model aims to provide a ground electrification automatic neutral section passing main wiring system which can check and overhaul a high-voltage switch after equipment is withdrawn from the ground electrification automatic neutral section passing system by power failure.
The technical scheme for achieving the purposes is as follows:
The ground electrification automatic passing split-phase main wiring system is characterized by comprising a third switching unit, wherein the third switching unit comprises a third circuit breaker and a sixth circuit breaker connected in series with the third circuit breaker, one end of the third circuit breaker is connected between a first high-voltage switch and a first isolating switch, the other end of the third circuit breaker is connected with one end of the sixth circuit breaker, the other end of the sixth circuit breaker is connected between a second high-voltage switch and a second isolating switch, and the third circuit breaker is connected with the third isolating switch both between the third circuit breaker and the sixth circuit breaker and between the first high-voltage switch and the second high-voltage switch.
Further limited, the ground electrified automatic passing neutral section main wiring system further comprises a fourth disconnecting switch, a fifth disconnecting switch and a sixth disconnecting switch, wherein the fourth disconnecting switch is connected between the first high-voltage switch and the first disconnecting switch, the fifth disconnecting switch is connected between the second high-voltage switch and the second disconnecting switch, one end of the third circuit breaker is connected between the fourth disconnecting switch and the first disconnecting switch, the other end of the sixth circuit breaker is connected between the fifth disconnecting switch and the second disconnecting switch, one end of the sixth disconnecting switch is connected between the first high-voltage switch and the second high-voltage switch, the other end of the sixth disconnecting switch is connected between the third circuit breaker and the sixth disconnecting switch, and the sixth disconnecting switch is connected in series with the third disconnecting switch.
Further defined, the ground live automatic passing neutral section main wiring system further comprises a first switching unit, and the third circuit breaker and the fourth disconnecting switch are connected with the first disconnecting switch through the first switching unit.
Further defined, the first switching unit comprises a first circuit breaker and a second circuit breaker connected in parallel with the first circuit breaker, and the third circuit breaker and the fourth disconnecting switch are connected with the first disconnecting switch through the first circuit breaker and/or the second circuit breaker.
Further defined, the ground live automatic passing neutral section main wiring system further comprises a second switching unit, and the sixth circuit breaker and the fifth disconnecting switch are connected with the second disconnecting switch through the second switching unit.
Further defined, the second switching unit comprises a fourth circuit breaker and a fifth circuit breaker connected in parallel with the fourth circuit breaker, and the sixth circuit breaker and the fifth disconnecting switch are connected with the second disconnecting switch through the fourth circuit breaker and/or the fifth circuit breaker.
Further defined, rated operating voltages of the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker are 27.5kv, and rated operating currents are 1600A.
Further defined, rated operating voltages of the first isolating switch, the second isolating switch, the third isolating switch, the fourth isolating switch, the fifth isolating switch and the sixth isolating switch are 27.5kv, and rated operating currents are 1600A.
Further defined, the first high voltage switch and the second high voltage switch are both selected as electronic switches.
The utility model has the beneficial effects that:
1. According to the utility model, the third circuit breaker and the sixth circuit breaker are added, the third circuit breaker is connected in parallel with the first high-voltage switch, and the sixth circuit breaker is connected in parallel with the second high-voltage switch, so that the switching of the third circuit breaker and the sixth circuit breaker can be used as a standby when the second high-voltage switch and the first high-voltage switch are in fault, and the ground electrification automatic passing neutral section system power failure inspection and maintenance when the high-voltage switch is in fault is avoided, and the ground electrification automatic passing neutral section system power failure inspection and maintenance system is simple in structure and low in cost.
2. According to the utility model, the fourth isolating switch, the fifth isolating switch and the sixth isolating switch are added, so that the second high-voltage switch and the first high-voltage switch can be withdrawn by switching off the fourth isolating switch, the fifth isolating switch and the sixth isolating switch when the second high-voltage switch and the first high-voltage switch are in failure, thereby enabling a worker to carry out maintenance safely and reliably, avoiding electrified operation and improving maintenance efficiency.
3. According to the utility model, the first switching unit and the second switching unit are added, so that the neutral zone is controlled to be connected with the A-phase power supply arm or the B-phase power supply arm according to the running position of the train, and the on-off states of the first switching unit connected with the first high-voltage switch in series and the second switching unit connected with the second high-voltage switch in series are controlled, so that the first high-voltage switch and the second high-voltage switch are further ensured to be powered off and withdrawn, the live operation is avoided, and the use requirement is met.
4. The first switching unit and the second switching unit are respectively provided with two switches connected in parallel, and one switch of each switching unit is used as a standby when in operation, so that the temperature stability and the reliability of the ground electrified automatic neutral section passing system are improved.
Drawings
FIG. 1 is a diagram of a prior art ground powered auto-phase passing main wiring system;
FIG. 2 is a diagram of a ground powered auto-passing neutral section main wiring system in accordance with embodiment 1 of the present utility model;
FIG. 3 is a diagram of a ground powered auto-passing neutral section main wiring system in accordance with embodiment 2 of the present utility model;
FIG. 4 is a diagram of a ground powered auto-passing neutral section main wiring system in accordance with embodiment 3 of the present utility model;
In the figure, 1-1: a first high voltage switch; 1-2: a second high voltage switch; 2-1: a first isolation switch; 2-2: a second isolation switch; 2-3: a third isolation switch; 2-4: a fourth isolating switch; 2-5: a fifth isolating switch; 2-6: a sixth isolating switch; 3-1: a phase A power supply arm; 3-2: a neutral zone; 3-3: a B-phase power supply arm; 4-1: a first circuit breaker; 4-2: a second circuit breaker; 4-3: a third circuit breaker; 4-4: a fourth circuit breaker; 4-5: a fifth circuit breaker; 4-6: and a sixth circuit breaker.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
Example 1
Referring to fig. 2, the present embodiment provides a ground electrification automatic passing neutral section main wiring system, which includes an a-phase switching unit, a B-phase switching unit, a neutral section switching unit, a first switching unit, a second switching unit, and a third switching unit.
The third switching unit comprises a third circuit breaker 4-3 and a sixth circuit breaker 4-6, one end of the third circuit breaker 4-3 is connected between the first high-voltage switch 1-1 and the first isolating switch 2-1, the other end of the third circuit breaker 4-3 is connected with one end of the sixth circuit breaker 4-6, the other end of the sixth circuit breaker 4-6 is connected between the second high-voltage switch 1-2 and the second isolating switch 2-2, and the third circuit breaker 4-3 and the sixth circuit breaker 4-6 and the first high-voltage switch 1-1 and the second high-voltage switch 1-2 are connected with the third isolating switch 2-3, so that the third circuit breaker 4-3 is connected with the first high-voltage switch 1-1 in parallel and the sixth circuit breaker 4-6 is connected with the second high-voltage switch 1-2 in parallel.
In actual operation, if the first high-voltage switch 1-1 fails, only the first isolating switch 2-1, the second isolating switch 2-2 and the third isolating switch 2-3 are required to be turned off, and when the first high-voltage switch 1-1 is required to be turned on, the third circuit breaker 4-3 is turned on to replace the first high-voltage switch 1-1 as a standby switch thereof; when the second high-voltage switch 1-2 is normal, the sixth breaker 4-6 is kept open; if the second high-voltage switch 1-2 fails, only the first isolating switch 2-1, the second isolating switch 2-2 and the third isolating switch 2-3 are required to be kept closed, the third circuit breaker 4-3 is opened, the first high-voltage switch 1-1 is opened and closed according to the requirement, and the sixth circuit breaker 4-6 is opened and closed when the second high-voltage switch 1-2 needs to act, so that the passing neutral section of the train is completed, and the device is simple in structure and convenient to operate.
Example 2
Further describing, referring to fig. 3, in order to avoid that the first high-voltage switch 1-1 cannot be overhauled in time after failure, the ground live automatic passing neutral section main wiring system provided in this embodiment further includes a fourth isolating switch 2-4, a fifth isolating switch 2-5 and a sixth isolating switch 2-6.
Specifically, the fourth isolating switch 2-4 is connected between the first high-voltage switch 1-1 and the first isolating switch 2-1, the fifth isolating switch 2-5 is connected between the second high-voltage switch 1-2 and the second isolating switch 2-2, one end of the third circuit breaker 4-3 is connected between the fourth isolating switch 2-4 and the first isolating switch 2-1, one end of the sixth circuit breaker 4-6 is connected between the fifth isolating switch 2-5 and the second isolating switch 2-2, one end of the sixth isolating switch 2-6 is connected between the first high-voltage switch 1-1 and the second high-voltage switch 1-2, the other end of the sixth isolating switch 2-6 is connected between the third circuit breaker 4-3 and the sixth circuit breaker 4-6, and the sixth isolating switch 2-6 is connected in series with the third isolating switch 2-3.
In the working process, if the first high-voltage switch 1-1 and the second high-voltage switch 1-2 are normal, the four isolating switches 2-4, the fifth isolating switch 2-5 and the sixth isolating switch 2-6 are kept closed, the third circuit breaker 4-3 and the sixth circuit breaker 4-6 are opened, and the first high-voltage switch 1-1 and the second high-voltage switch 1-2 respectively act according to the running position of the train, so that the neutral zone 3-3 is connected with the A-phase power supply arm 3-1 or the neutral zone 3-3 is connected with the B-phase power supply arm 3-2.
If the first high-voltage switch 1-1 and/or the second high-voltage switch 1-2 fail, the first high-voltage switch 1-1 and the second high-voltage switch 1-2 are simultaneously withdrawn, namely, the four isolating switch 2-4, the fifth isolating switch 2-5 and the sixth isolating switch 2-6 are disconnected, so that the first high-voltage switch 1-1 and the second high-voltage switch 1-2 are not electrified, and the first high-voltage switch 1-1 and the second high-voltage switch 1-2 are convenient to overhaul.
Example 3
Further describing, referring to fig. 4, in order to further improve the reliability of the running of the train when the first high voltage switch 1-1 and the second high voltage switch 1-2 fail, the ground electrification automatic passing neutral section main wiring system provided in this embodiment further includes a first switching unit and a second switching unit.
The first switching unit comprises a first circuit breaker 4-1 and a second circuit breaker 4-2 connected in parallel with the first circuit breaker 4-1, the third circuit breaker 4-3 and the fourth disconnecting switch 2-4 are connected with the first disconnecting switch 2-1 through the first circuit breaker 4-1 and/or the second circuit breaker 4-2, the second switching unit comprises a fourth circuit breaker 4-4 and a fifth circuit breaker 4-5 connected in parallel with the fourth circuit breaker 4-4, and the sixth circuit breaker 4-6 and the fifth disconnecting switch 2-5 are connected with the second disconnecting switch 2-2 through the fourth circuit breaker 4-4 and/or the fifth circuit breaker 4-5.
Specifically, during actual operation, the second circuit breaker 4-2 is kept open as a backup switch when the first circuit breaker 4-1 is closed, the second circuit breaker 4-2 is operated instead of the first circuit breaker 4-1 when the first circuit breaker 4-1 fails, or the first circuit breaker 4-1 is kept open as a backup switch when the second circuit breaker 4-2 is closed, and the first circuit breaker 4-1 is operated instead of the second circuit breaker 4-2 when the second circuit breaker 4-2 fails; likewise, the fifth circuit breaker 4-5 in the second switching unit e is kept open as a backup switch when the fourth circuit breaker 4-4 is closed, the fifth circuit breaker 4-5 is operated instead of the fourth circuit breaker 4-4 when the fourth circuit breaker 4-4 fails, or the fourth circuit breaker 4-4 is kept open as a backup switch when the fifth circuit breaker 4-5 is closed, and the fourth circuit breaker 4-4 is operated instead of the fifth circuit breaker 4-5 when the fifth circuit breaker 4-5 fails, thereby ensuring the stable operation of the ground-powered auto-passing neutral section system.
Further, when the first circuit breaker 4-1 cannot be closed in operation, the second circuit breaker 4-2 is closed as a standby switch, and when the first circuit breaker 4-1 cannot be opened in operation, in order to avoid that the first circuit breaker 4-1 is closed and suddenly opened in an unstable manner, the second circuit breaker 4-2 is closed, and the third circuit breaker 4-3 is controlled to serve as a standby switch of the first high voltage switch 1-1; similarly, when the fourth circuit breaker 4-4 cannot be closed during operation, the fifth circuit breaker 4-5 is used as a standby switch to be closed, and when the fourth circuit breaker 4-4 cannot be opened during operation, in order to avoid unstable and abrupt opening of the fourth circuit breaker 4-4, the fifth circuit breaker 4-5 is closed, and the sixth circuit breaker 4-6 is controlled to be used as the standby switch of the second high-voltage switch 1-2, so that the stable and reliable operation of the ground electrified auto-passing neutral section system is ensured.
The first high-voltage switch 1-1 and the second high-voltage switch 1-2 can be electronic switches such as GTO and IGBT, the first breaker 4-1, the second breaker 4-2, the third breaker 4-3, the fourth breaker 4-4, the fifth breaker 4-5 and the sixth breaker 4-6 can be commercial breakers, and the first disconnecting switch 2-1, the second disconnecting switch 2-2, the third disconnecting switch 2-3, the fourth disconnecting switch 2-4, the fifth disconnecting switch 2-5 and the sixth disconnecting switch 2-6 can be disconnecting switches; and the rated operating voltage of the circuit breaker and the rated operating voltage of the isolating switch are both 27.5kv, and the rated operating current of the circuit breaker and the rated operating current of the isolating switch are both 1600A, namely, the high-voltage high-current working environment can be satisfied.
The above is an embodiment of the present application. The foregoing embodiments and the specific parameters in the embodiments are only for clarity of the verification process of the application, and are not intended to limit the scope of the application, which is defined by the claims, and all equivalent structural changes made by the application of the specification and drawings of the application are included in the scope of the application.
Claims (9)
1. The ground electrification automatic passing split phase main wiring system is characterized by comprising a third switching unit, wherein the third switching unit comprises a third circuit breaker (4-3) and a sixth circuit breaker (4-6) connected in series with the third circuit breaker (4-3), one end of the third circuit breaker (4-3) is connected between a first high-voltage switch (1-1) and a first disconnecting switch (2-1), the other end of the third circuit breaker (4-3) is connected with one end of the sixth circuit breaker (4-6), the other end of the sixth circuit breaker (4-6) is connected between a second high-voltage switch (1-2) and a second disconnecting switch (2-2), and both the third circuit breaker (4-3) and the sixth circuit breaker (4-6) and the first high-voltage switch (1-1) and the second high-voltage switch (1-2) are connected with the third disconnecting switch (2-3).
2. The ground-powered auto-passing neutral section main wiring system as claimed in claim 1, further comprising a fourth disconnector (2-4), a fifth disconnector (2-5) and a sixth disconnector (2-6), said fourth disconnector (2-4) being connected between the first high voltage switch (1-1) and the first disconnector (2-1), the fifth disconnector (2-5) being connected between the second high voltage switch (1-2) and the second disconnector (2-2), one end of the third circuit breaker (4-3) being connected between the fourth disconnector (2-4) and the first disconnector (2-1), the other end of the sixth circuit breaker (4-6) being connected between the fifth disconnector (2-5) and the second disconnector (2-2), one end of the sixth disconnector (2-6) being connected between the first high voltage switch (1-1) and the second high voltage switch (1-2), the other end of the third circuit breaker (4-3) being connected between the third circuit breaker (4-6) and the third circuit breaker (4-6).
3. The ground-powered auto-passing neutral section main wiring system as claimed in claim 2, further comprising a first switching unit, through which the third circuit breaker (4-3) and the fourth disconnector (2-4) are connected to the first disconnector (2-1).
4. A ground-powered auto-passing neutral section main wiring system as claimed in claim 3, characterized in that said first switching unit comprises a first circuit breaker (4-1) and a second circuit breaker (4-2) connected in parallel with the first circuit breaker (4-1), said third circuit breaker (4-3) and fourth disconnector (2-4) being connected to the first disconnector (2-1) by means of the first circuit breaker (4-1) and/or the second circuit breaker (4-2).
5. The ground-powered auto-passing neutral section main wiring system as claimed in claim 4, further comprising a second switching unit, through which the sixth circuit breaker (4-6) and the fifth disconnector (2-5) are connected to the second disconnector (2-2).
6. The ground-powered auto-passing neutral section main wiring system as claimed in claim 5, characterized in that said second switching unit comprises a fourth circuit breaker (4-4) and a fifth circuit breaker (4-5) connected in parallel with the fourth circuit breaker (4-4), said sixth circuit breaker (4-6) and fifth disconnector (2-5) being connected to the second disconnector (2-2) by means of the fourth circuit breaker (4-4) and/or the fifth circuit breaker (4-5).
7. The ground-powered auto-passing neutral section main wiring system of claim 6, characterized in that the rated operating voltages of the first circuit breaker (4-1), the second circuit breaker (4-2), the third circuit breaker (4-3), the fourth circuit breaker (4-4), the fifth circuit breaker (4-5) and the sixth circuit breaker (4-6) are all 27.5kv, and the rated operating currents are all 1600A.
8. The ground-powered auto-passing neutral section main wiring system as claimed in claim 7, wherein the rated operating voltages of said first (2-1), second (2-2), third (2-3), fourth (2-4), fifth (2-5) and sixth (2-6) disconnectors are all 27.5kv and the rated operating currents are all 1600A.
9. The ground-powered auto-passing neutral section main wiring system as claimed in claim 8, wherein said first high voltage switch (1-1) and second high voltage switch (1-2) are both selected as electronic switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322462753.1U CN220985370U (en) | 2023-09-11 | 2023-09-11 | Ground electrified automatic neutral-section passing main wiring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322462753.1U CN220985370U (en) | 2023-09-11 | 2023-09-11 | Ground electrified automatic neutral-section passing main wiring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220985370U true CN220985370U (en) | 2024-05-17 |
Family
ID=91038124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322462753.1U Active CN220985370U (en) | 2023-09-11 | 2023-09-11 | Ground electrified automatic neutral-section passing main wiring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220985370U (en) |
-
2023
- 2023-09-11 CN CN202322462753.1U patent/CN220985370U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103618329B (en) | Multi-terminal flexible direct current transmission system and single-station online isolation and grid connection method thereof | |
| CN103532221A (en) | Spare-power automatic switching implementation method of lines under wiring and operating modes of self-adaptive 330kV substation | |
| CN220985370U (en) | Ground electrified automatic neutral-section passing main wiring system | |
| CN203261040U (en) | Low-voltage dynamic reactive power compensation device | |
| CN200969314Y (en) | Outdoor high-voltage duplicate power supply vacuum circuit breaker | |
| CN202363371U (en) | Alternating-current high-voltage bistable permanent magnet contactor | |
| CN113572189A (en) | Bipolar flexible direct current system for offshore wind power and transformer fault switching method thereof | |
| CN109004660B (en) | Intelligent load distributor for intelligent camera changing mechanism | |
| CN101795003B (en) | Solid combination switch device | |
| CN212572087U (en) | Alternating current contactor anti-interference device based on bidirectional thyristor structure | |
| CN220985312U (en) | Ground electrified automatic passing neutral section overvoltage reducing system | |
| CN110350650B (en) | High-capacity high-reliability rapid power supply switching device and switching control method thereof | |
| CN210693533U (en) | Open-circuit protection device for storage battery pack of transformer substation | |
| CN204407235U (en) | A kind of cylinder controlled type high degree of safety electrical control isolating switch | |
| CN210224772U (en) | GIS wiring and layout structure | |
| CN202084985U (en) | Self-startup power supply apparatus | |
| CN102157283A (en) | Control circuit for transfer switch | |
| CN208257496U (en) | Dual-power automatic switching formula heating tape current supply circuit | |
| CN202094512U (en) | Mechanism enabling medium pressure side of main transformer to be uninterruptible in overhaul | |
| CN202067694U (en) | Control circuit of change-over switch | |
| CN201298751Y (en) | Modified electricity no-voltage backup power switchover unit used in transformer station | |
| CN114465186B (en) | Direct current ice melting circuit short circuit device | |
| CN201690233U (en) | Low-voltage electric network three-phase four-wire system power supply intelligent switch device | |
| CN219999093U (en) | Main and standby power supply automatic conversion control device for dust removal system and dust removal system | |
| Cao et al. | Failure Mode Analysis and Identification Method Based on the External Characteristics of DC Circuit Breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |