CN220628881U - Quick current limiting device - Google Patents
Quick current limiting device Download PDFInfo
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- CN220628881U CN220628881U CN202322044473.9U CN202322044473U CN220628881U CN 220628881 U CN220628881 U CN 220628881U CN 202322044473 U CN202322044473 U CN 202322044473U CN 220628881 U CN220628881 U CN 220628881U
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- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 230000010355 oscillation Effects 0.000 claims abstract description 15
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011787 zinc oxide Substances 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000005191 phase separation Methods 0.000 abstract 3
- 230000008859 change Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Abstract
The utility model provides a rapid current limiting device, relates to the technical field of high voltage, and is used for rapidly starting and limiting power frequency short-circuit current of a power supply system in a front stage of a head wave. The device comprises three phase splitting units and a common unit: the primary loop of each phase separation unit is formed by connecting a fast vacuum breaker branch, an inductance and capacitance and trigger branch, a zinc oxide arrester branch and a current limiting reactor branch in parallel, and the secondary loop of each phase separation unit comprises a short circuit judging module, a trigger ignition module and a repulsion mechanism tripping module; the public unit comprises a public control module and a public tripping power module, and is used for precisely controlling the tripping of the quick vacuum circuit breaker of the phase separation unit and the ignition of the trigger. The high-frequency oscillation current is overlapped on the first-wave power frequency short-circuit current in time, so that the quick vacuum circuit breaker can be quickly opened and closed at the manual zero crossing point in the front stage and put into the current limiting reactor to limit the short-circuit current, and the effectiveness and the short-circuit tolerance level of the current limiting device are further improved.
Description
Technical Field
The utility model relates to the technical field of high voltage, in particular to a rapid current limiting device.
Background
When the power supply system of the power plant and the transformer substation has short-circuit faults, high-amplitude short-circuit current can be generated in the system, and the short-circuit current level of the system is increased year by year along with the development of the power industry. The method effectively limits short-circuit current and prevents the generator and the transformer from being damaged by the electrodynamic force and thermal shock of the short-circuit current, which is an important subject in the high-voltage technical field.
The short-circuit current limiting device (fault current limiter) has various principles and structures, and has various advantages and disadvantages according to various requirements of effectiveness, reliability, economy, convenience and the like, but the variety of products applied in field scale at present is not large.
One device with more applications is to connect a blasting cut type high-current high-speed switch (Chinese patent No. 2008200283439) in parallel to a current-limiting reactor to form a lossless fast current limiter: during normal operation, the high-speed switch bypasses the current-limiting reactor; when a short-circuit fault occurs, the high-speed switch and the current-limiting fuse connected in parallel with the high-speed switch are opened within about 1-4ms, and the current-limiting reactor is put into operation before the short-circuit current of the first half-wave of the power frequency rises to the peak value, so that the current-limiting function is realized. The device has the advantages that the reactor is put into operation within the wave front (5 ms) time of the short-circuit current head wave, so that the high-speed current limiting is realized, and the safety of the generator and the transformer can be fully ensured; however, the disadvantage is that the moving parts need to be replaced after the movement.
Another device is to connect a high-speed breaker (Chinese patent No. 2017105299367) with a zero-crossing current-limiting reactor to form a zero-loss deep current-limiting device. The device has the advantages that spare parts are not required to be replaced after the device acts, and the device can act repeatedly; based on the basic principle that the zero crossing point of the short-circuit current is opened, the action time is 7-15ms, the reactor is put into the reactor after the first large half-wave short-circuit current flows, and the first large half-wave short-circuit current is not limited.
Therefore, there is a need for a current limiting device that has the advantages of both devices, i.e., a fast current limiting device that can be reused without replacement of spare parts after the wavefront action of the primary wave.
Disclosure of Invention
The utility model aims to provide a quick current limiting device which is operated in a lossless mode, has small electric power impact, is reliable and quick, and is easy to control, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the rapid current limiting device comprises an A phase unit, a B phase unit, a C phase unit and a public unit.
The A phase unit, the B phase unit and the C phase unit have the same structure and respectively comprise a primary component and a secondary component which are configured equally.
The primary components of the A phase unit, the B phase unit and the C phase unit are respectively composed of a voltage transformer and a current sensor which are connected on a main loop, and four parallel branches which are connected in the main loop in series: the first parallel branch is a breaker branch, the second parallel branch is an oscillation and trigger branch, the third parallel branch is an overvoltage protection branch, and the fourth parallel branch is a current limiting branch.
Further, the voltage transformer is an electromagnetic voltage transformer.
Further, the current sensor is a rogowski sensor.
Further, the breaker branch circuit is composed of a rapid vacuum breaker adopting a repulsive force mechanism.
Furthermore, the oscillation and trigger branch circuit is formed by connecting an oscillation inductor, an oscillation capacitor and a trigger in series; and charging loops are connected in parallel at two ends of the oscillating capacitor.
Optionally, the trigger is a trigger gap or a vacuum trigger switch or a thyristor.
Further, the overvoltage protection branch circuit is composed of a zinc oxide lightning arrester; the current-limiting branch is formed by a current-limiting reactor.
Optionally, the current-limiting branch is formed by a current-limiting resistor.
Further, the secondary components of the A phase unit, the B phase unit and the C phase unit have the same structure, and each secondary component comprises an integrator, a short circuit judging module, a trigger ignition module and a repulsive force mechanism tripping module which are arranged in an equivalent mode.
Further, the common unit comprises a common control module and a common tripping power module, and is used for precisely controlling the tripping of the quick vacuum circuit breaker of the A-phase unit, the B-phase unit and the C-phase unit and the ignition of the trigger.
Furthermore, the output end of the public tripping power supply module is in parallel connection with the input ends of the repulsive force mechanism tripping module of the A-phase unit, the B-phase unit and the C-phase unit, and the public control module outputs the same control signal to the trigger ignition modules of the A-phase unit, the B-phase unit and the C-phase unit at the same time.
Compared with the prior art, the utility model has the beneficial effects that:
1) Under the normal operation condition, the current limiting reactor or the current limiting resistor is bypassed by the rapid vacuum breaker, so that the operation is lossless;
2) Under the condition of short circuit, a current limiting reactor or a current limiting resistor is rapidly put into a front stage of a first wave of the power frequency short circuit current, so that a first large half-wave short circuit current value is effectively limited, and the electric power impact of the power frequency short circuit current on the main equipment is reduced;
3) Judging whether the system is short-circuited according to three criteria of voltage u, current change rate di/dt and current i, and being reliable and quick;
4) A zinc oxide arrester is connected in parallel with the quick vacuum breaker, so that high-frequency overvoltage generated on a fracture and a current limiting reactor connected in parallel with the fracture is limited when the quick vacuum breaker is opened by high-frequency zero crossing, and the fracture is prevented from being re-burnt and arc extinction failure;
5) A, B, C repulsive force mechanisms are not provided with a tripping power supply module respectively, but are provided with a tripping power supply module in common, so that the setting quantity of tripping power supplies is reduced, and the control is simplified.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of another embodiment of the present utility model;
in the figure: 1-A, A phase units; 1-B, B phase units; 1-C, C phase units; 2. a common unit; 3-A, A phase primary assembly; 4-A, A phase secondary assembly; 5-A, A phase quick vacuum circuit breaker; 5-B, B phase quick vacuum circuit breaker; 5-C, C phase quick vacuum circuit breaker; 6. an oscillating inductance; 7. an oscillation capacitor; 8. a trigger; 9. a charging circuit; 10. a zinc oxide arrester; 11-1, a current limiting reactor; 11-2, a current limiting resistor; 12. a voltage transformer; 13. a current sensor; 14. an integrator; 15. a short circuit determination module; 16. a common control module; 17. a utility trip power module; 18. a trigger ignition module; 19-A, A repulsive force mechanism trip module; 19-B, B repulsive force mechanism trip module; 19-C, C repulsive force mechanism trip module; a0, A phase short-circuit current signals; b0, B phase short-circuit current signal; c0 and C phase short circuit current signals.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the utility model provides a technical scheme that: a fast current limiting device comprises an A phase unit 1-A, a B phase unit 1-B, a C phase unit 1-C and a common unit 2.
The A phase unit 1-A is identical to the B phase unit 1-B, C in structure with the B phase unit 1-C, and each of the A phase unit 1-A and the B phase unit 1-B, C comprises a primary component and a secondary component which are configured identically.
Taking phase a as an example, the phase a unit 1-a comprises a primary component 3-a and a secondary component 4-a.
The primary assembly 3-a of the a-phase unit is constituted by a voltage transformer 12 and a current sensor 13 connected to the main circuit, and four parallel branches connected in series in the main circuit: the first parallel branch is a breaker branch, the second parallel branch is an oscillation and trigger branch, the third parallel branch is an overvoltage protection branch, and the fourth parallel branch is a current limiting branch.
The voltage transformer 12 is an electromagnetic voltage transformer;
the current sensor 13 is a rogowski sensor;
the circuit breaker branch circuit consists of a rapid vacuum circuit breaker 5-A/5-B/5-C adopting a repulsive force mechanism;
the oscillation and trigger branch circuit is formed by connecting an oscillation inductor 6, an oscillation capacitor 7 and a trigger 8 in series;
the two ends of the oscillating capacitor are connected with a charging loop 9 in parallel;
alternatively, the trigger 8 may be a trigger gap or a vacuum trigger switch or a thyristor;
the overvoltage protection branch circuit is composed of a zinc oxide lightning arrester 10;
the current-limiting branch consists of a current-limiting reactor 11-1;
the secondary assembly 4-a of the a-phase unit 1-a comprises an integrator 14, a short circuit determination module 15, a trigger ignition module 18 and an a-phase repulsive force mechanism trip module 19-a.
The secondary assembly of the phase B unit 1-B, C phase unit 1-C is structurally equivalent to the secondary assembly 4-A of the phase A unit 1-A. The secondary components of the B-phase unit 1-B include an integrator 14, a short circuit determination module 15, a trigger firing module 18, and a B-repulsion mechanism trip module 19-B. The secondary components of the C-phase unit 1-C include an integrator 14, a short circuit determination module 15, a trigger firing module 18, and a C-repulsive force mechanism trip module 19-C.
The utility unit includes a utility control module 16 and a utility trip power module 17.
The working flow of the utility model is as follows:
the voltage transformer 12 of the a-phase unit provides a system voltage U signal to the short circuit determination module 15, the current sensor 13 provides a current change rate di/dt signal to the short circuit determination module 15, and the integrator 14 provides a current i signal to the short circuit determination module 15. The short circuit judging module 15 comprehensively judges whether the system is short-circuited according to AND gate logic according to the voltage signal u, the current change rate di/dt signal, the current i signal and a preset criterion. In the event that a short circuit is determined to have occurred, the processed phase a short circuit current signal A0 is sent to the common control module 16. At the same time, the B-phase unit and the C-phase unit send the processed B-phase short circuit current signal B0 and the C-phase short circuit current signal C0, respectively, to the common control module 16.
The public control module 16 firstly sends signals to the public tripping power module 17 according to the time t1 when the OR gate logic reaches a certain phase of the set value first according to the sequence of the short circuit current signals of A0, B0 and C0 reaching the set threshold value, the output end of the public tripping power module 17 and the input ends of the repulsive force mechanism tripping modules of the A-phase units 1-A, B and the C-phase units 1-C are in parallel connection, the public tripping power module 17 outputs tripping currents to A, B and the C-phase repulsive force mechanism tripping modules 19-A, 19-B and 19-C which are connected in parallel at the output ends of the public tripping power module 17 at the same time, and drives A, B, C-phase quick vacuum circuit breakers 5-A, 5-B and 5-C which are connected in series in a main circuit to trip, and the breaking time of the quick vacuum circuit breakers is 4ms.
Then taking phase A as an example, after a set delay time delta t and a certain distance between contacts of the quick vacuum circuit breaker are reached, the public control module sends a starting command to the trigger ignition module 18 at the moment of t1+delta t, the trigger ignition module 18 sends an ignition pulse to the trigger 8, so that the oscillating capacitor 7 discharges through the oscillating inductor 6, the trigger 8 and the quick vacuum circuit breaker 5-A to generate high-frequency oscillation, the oscillating frequency is in the order of magnitude of 1kHz, the high-frequency oscillating current is superposed with the power frequency short-circuit current flowing through the quick vacuum circuit breaker 5-A, and a manual zero crossing is generated before the power frequency short-circuit current reaches a peak value, so that the quick vacuum circuit breaker 5-A is opened by high-frequency zero crossing; when the quick vacuum circuit breaker 5-A is opened, high-frequency overvoltage can be generated on the fracture, so that the zinc oxide arrester 10 connected in parallel with the quick vacuum circuit breaker acts and absorbs the overvoltage energy; and then the short-circuit current is transferred to the current limiting reactor 11-1 connected in parallel, so that the purpose of fast current limiting in the front stage of the first wave of the power frequency short-circuit current is achieved.
The opening process of the B-phase fast breaker 5-B and the C-phase fast breaker 5-C is the same as above.
Referring to fig. 2, another technical scheme of the present utility model is as follows: compared with fig. 1, the difference is that the current-limiting branch is composed of a current-limiting resistor 11-2, other parts are identical to fig. 1, and the principle and the working flow of the whole device are identical to those of fig. 1.
The foregoing description is only of the preferred embodiments of the utility model, and all changes and modifications that come within the meaning and range of equivalency of the structures, features and principles of the utility model are therefore intended to be embraced therein.
Claims (8)
1. The rapid current limiting device is characterized by comprising an A-phase unit, a B-phase unit, a C-phase unit and a public unit;
the A phase unit, the B phase unit and the C phase unit have the same structure and respectively comprise a primary component and a secondary component which are configured equally;
the primary components of the A phase unit, the B phase unit and the C phase unit are respectively composed of a voltage transformer, a current sensor and four parallel branches connected in the main loop in series.
2. A fast current limiting device according to claim 1, wherein the four parallel branches are: the first parallel branch is a breaker branch, the second parallel branch is an oscillation and trigger branch, the third parallel branch is an overvoltage protection branch, and the fourth parallel branch is a current limiting branch.
3. A fast current limiting device according to claim 2, wherein the circuit breaker branch is constituted by a fast vacuum circuit breaker employing a repulsive force mechanism;
the oscillation and trigger branch circuit is formed by connecting an oscillation inductor, an oscillation capacitor and a trigger in series;
the overvoltage protection branch circuit is composed of a zinc oxide lightning arrester;
the current-limiting branch is composed of a current-limiting reactor or a current-limiting resistor.
4. A fast current limiting device according to claim 3, wherein a charging loop is connected in parallel across the oscillating capacitor; the trigger is a trigger gap or a vacuum trigger switch or a thyristor.
5. The fast current limiting device according to claim 1, wherein the voltage transformer is an electromagnetic voltage transformer and the current sensor is a rogowski sensor.
6. The fast current limiting device according to claim 1, wherein the a-phase unit, the B-phase unit, and the C-phase unit each comprise an integrator, a short circuit determination module, a trigger ignition module, and a repulsive force mechanism tripping module configured identically.
7. The fast current limiting device according to claim 1, wherein the common unit comprises a common control module and a common trip power module for precisely controlling tripping of the fast vacuum circuit breaker of the a-phase unit, the B-phase unit and the C-phase unit and ignition of the trigger.
8. The fast current limiting device according to claim 7, wherein the output end of the utility trip power module is in parallel connection with the input ends of the repulsive force mechanism tripping modules of the a-phase unit, the B-phase unit and the C-phase unit, and the utility control module outputs the same control signal to the trigger ignition modules of the a-phase unit, the B-phase unit and the C-phase unit at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322044473.9U CN220628881U (en) | 2023-08-01 | 2023-08-01 | Quick current limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322044473.9U CN220628881U (en) | 2023-08-01 | 2023-08-01 | Quick current limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628881U true CN220628881U (en) | 2024-03-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322044473.9U Active CN220628881U (en) | 2023-08-01 | 2023-08-01 | Quick current limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628881U (en) |
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2023
- 2023-08-01 CN CN202322044473.9U patent/CN220628881U/en active Active
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