CN215817517U - Zero-loss current limiting device - Google Patents
Zero-loss current limiting device Download PDFInfo
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- CN215817517U CN215817517U CN202121356431.3U CN202121356431U CN215817517U CN 215817517 U CN215817517 U CN 215817517U CN 202121356431 U CN202121356431 U CN 202121356431U CN 215817517 U CN215817517 U CN 215817517U
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Abstract
A zero-loss current limiting device is characterized in that: the operation loop, the standby operation loop and the current limiting loop are connected in parallel; the running loop consists of a first trolley type vacuum circuit breaker (1), a first power assembly (VT 1) and a first isolating switch (4), wherein the first trolley type vacuum circuit breaker (1), the first power assembly (VT 1) and the first isolating switch (4) are connected in series; the standby operation loop consists of a second handcart type vacuum circuit breaker (5), a second power assembly (VT 2) and a second isolating switch (8), wherein the second handcart type vacuum circuit breaker (5), the second power assembly (VT 2) and the second isolating switch (8) are connected in series; the current limiting loop is an air reactor (9); the running loop and the standby running loop are two identical parallel loops which are standby each other; when the power grid is normal, the current does not flow through the current-limiting air reactor (9), the voltage drop is not generated in the current-limiting loop, the impedance of the current-limiting air reactor (9) can be designed to be larger, and the short-circuit current can be better inhibited during short-circuit fault.
Description
Technical Field
The invention designs a novel current-limiting protection device of a generator set, in particular to a zero-loss current-limiting device.
Background
The outlet end of the generator set is generally connected in series with an air reactor for inhibiting the impact of short-circuit current of a circuit on the generator set, so that the accident is not further expanded. The current-limiting mode has the advantages that on one hand, the copper loss of the hollow reactance is large, on the other hand, the value of the hollow reactance cannot be designed to be too large due to the fact that the voltage of a power grid in normal operation is guaranteed, and the current-limiting effect is not ideal.
Disclosure of Invention
In order to overcome the defects of large loss of the air core reactor and poor current limiting effect, the invention designs the impedance value of the current limiting air core reactor to be larger, can better limit short-circuit current when a power grid is in short circuit, and takes a loop based on anti-parallel silicon controlled rectifier as an operation loop when the power grid is in normal operation, current does not flow through the air core reactor, and the loss of the air core reactor is reduced to zero while the voltage of the power grid is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: a zero-loss current limiting device comprises an operation loop, a standby operation loop and a current limiting loop; the operation loop, the standby operation loop and the current limiting loop are connected in parallel.
Furthermore, the operation loop consists of a first vacuum circuit breaker, a first power assembly and a first isolating switch, wherein the first vacuum circuit breaker, the first power assembly and the first isolating switch are connected in series; the standby operation loop consists of a second vacuum circuit breaker, a second power assembly and a second isolating switch, wherein the second vacuum circuit breaker, the second power assembly and the second isolating switch are connected in series; the current limiting loop is an air reactor.
Furthermore, each phase of power assembly is formed by connecting a fast fuse and two anti-parallel thyristors in series.
When the power grid is normal, the conduction angle of the silicon controlled rectifier is adjusted to 180 degrees, the power component is fully conducted and is equivalent to the short circuit of two ends of the air reactor, current does not flow through the air reactor, and the loss of the air reactor is zero; when the power grid has a short-circuit fault, the silicon controlled rectifier is not conducted, and the air reactor plays a role in limiting current, so that the fault is not further expanded; when the power grid has slight fault of current increase caused by phase or earth discharge, the conduction angle of the silicon controlled rectifier is adjusted, the equivalent impedance of the air reactor is adjusted, the discharge current is limited, the power grid can normally run for a certain time with diseases, and the time is won for removing the fault.
The invention has the advantages and characteristics that:
1. the impedance value of the current-limiting air reactor can be designed to be larger, so that short-circuit current can be better inhibited when the power grid is seriously short-circuited;
2. when the power grid normally operates, the current-limiting hollow reactance loss is zero;
3. a standby operation loop is designed to ensure the long-term stable operation of the device;
4. the vacuum circuit breaker adopts a handcart type vacuum switch and is matched with the isolating switch, and the standby operation loop can be overhauled when the operation loop operates; when the standby operation loop operates, the operation loop can be overhauled.
Drawings
The preferred embodiments of the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a wiring schematic of a preferred embodiment of the present invention.
The reference numerals in the drawings denote: 1-a first handcart type vacuum circuit breaker, 2-a fast fuse, 3-a first anti-parallel silicon controlled rectifier, 4-a first isolating switch, 5-a second handcart type vacuum circuit breaker, 6-a second fast fuse, 7-a second anti-parallel silicon controlled rectifier, 8-a second isolating switch, 9-an air reactor, VT 1-a first power assembly and VT 2-a second power assembly.
Detailed Description
Referring to fig. 1, a zero-loss current limiting device includes an operating loop and a standby operating loop, and also includes a current limiting loop; the operation loop, the standby operation loop and the current limiting loop are connected in parallel.
Furthermore, the operation loop consists of a first trolley type vacuum circuit breaker (1), a first power assembly (VT 1) and a first isolating switch (4), wherein the first trolley type vacuum circuit breaker (1), the first power assembly (VT 1) and the first isolating switch (4) are connected in series; the standby operation loop consists of a second handcart type vacuum circuit breaker (5), a second power assembly (VT 2) and a second isolating switch (8), wherein the second handcart type vacuum circuit breaker (5), the second power assembly (VT 2) and the second isolating switch (8) are connected in series; the current limiting loop is an air-core reactor (9).
Furthermore, each phase of power assembly is formed by connecting a fast fuse (2) and two anti-parallel thyristors (3) in series.
When a power grid is normal, the conduction angle of two silicon controlled rectifiers (3) which are connected in anti-parallel is adjusted to be 180 degrees, a power component VT1 (or VT 2) is fully conducted and is equivalent to short circuit of an air reactor (9), the current of the air reactor (9) is zero, and the loss of the air reactor (9) is also zero; when a short-circuit fault occurs in a power grid, two anti-parallel thyristors (3) are not conducted, which is equivalent to the disconnection of a power component VT1 (or VT 2), and an air reactor (9) plays a role in limiting current, so that the accident is not further expanded; when a slight fault of phase or earth discharge occurs in the power grid, the conduction angle of two anti-parallel silicon controlled rectifiers (3) is adjusted, and the equivalent impedance of the air reactor (9) is adjusted, so that the power grid can normally run with a fault for a certain time, and the time is won for removing the fault.
When the power grid is normal, the current does not flow through the current-limiting air reactor (9), the current-limiting loop does not generate voltage drop, the impedance of the current-limiting air reactor (9) can be designed to be larger, and the short-circuit current can be better inhibited during short-circuit fault.
The operation loop and the standby operation loop are two identical parallel loops, when the operation loop has a fault, the operation loop can be switched to the standby operation loop, the first handcart type vacuum circuit breaker (1) of the operation loop is disconnected, a handcart is shaken out, the first isolating switch (4) is disconnected, and a first power assembly (VT 1) of the operation loop can be overhauled; when the standby operation loop has a fault, the standby operation loop can be switched to the operation loop, the second handcart type vacuum circuit breaker (5) of the standby operation loop is disconnected, the handcart is shaken out, the second isolating switch (8) is disconnected, and a second power assembly (VT 2) of the standby operation loop can be overhauled.
The handcart type vacuum circuit breaker in the operation loop and the standby operation loop can be replaced by a disconnecting switch and a vacuum switch, and the principle and the performance are unchanged.
While there has been shown and described the fundamental principles of the invention and the principal features and advantages thereof, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are merely illustrative of the structural relationships and principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A zero-loss current limiting device is characterized in that: the system comprises an operation loop, a standby operation loop and a current limiting loop; the operation loop, the standby operation loop and the current limiting loop are connected in parallel; the running loop consists of a first trolley type vacuum circuit breaker (1), a first power assembly (VT 1) and a first isolating switch (4), wherein the first trolley type vacuum circuit breaker (1), the first power assembly (VT 1) and the first isolating switch (4) are connected in series; the standby operation loop consists of a second handcart type vacuum circuit breaker (5), a second power assembly (VT 2) and a second isolating switch (8), wherein the second handcart type vacuum circuit breaker (5), the second power assembly (VT 2) and the second isolating switch (8) are connected in series; the current limiting loop is an air reactor (9); each phase of the power assembly is formed by connecting a fast fuse (2) and two anti-parallel controllable silicon (3) in series; the operation loop and the standby operation loop are two identical parallel loops, when the operation loop breaks down, the operation loop can be switched to the standby operation loop, the first handcart type vacuum circuit breaker (1) of the operation loop is disconnected, a handcart is shaken out, the first isolating switch (4) is disconnected, and a first power assembly (VT 1) of the operation loop can be overhauled; when the standby operation loop has a fault, the standby operation loop can be switched to the operation loop, the second handcart type vacuum circuit breaker (5) of the standby operation loop is disconnected, the handcart is shaken out, the second isolating switch (8) is disconnected, and a second power assembly (VT 2) of the standby operation loop can be overhauled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121356431.3U CN215817517U (en) | 2021-06-18 | 2021-06-18 | Zero-loss current limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121356431.3U CN215817517U (en) | 2021-06-18 | 2021-06-18 | Zero-loss current limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817517U true CN215817517U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121356431.3U Active CN215817517U (en) | 2021-06-18 | 2021-06-18 | Zero-loss current limiting device |
Country Status (1)
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| CN (1) | CN215817517U (en) |
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2021
- 2021-06-18 CN CN202121356431.3U patent/CN215817517U/en active Active
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