CN219372016U - Excitation surge current suppression system - Google Patents
Excitation surge current suppression system Download PDFInfo
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- CN219372016U CN219372016U CN202320372932.3U CN202320372932U CN219372016U CN 219372016 U CN219372016 U CN 219372016U CN 202320372932 U CN202320372932 U CN 202320372932U CN 219372016 U CN219372016 U CN 219372016U
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- surge
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- inrush current
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Abstract
The utility model discloses an excitation surge current suppression system, which comprises a surge current rapid identification system, an overvoltage suppressor, a live display system and a secondary control system, wherein the surge current rapid identification system comprises a surge current detection circuit, a surge current detection circuit and a surge current detection circuit, wherein the surge current detection circuit comprises a surge current detection circuit, a surge current detection circuit and a surge current detection circuit: the inrush current rapid identification system is connected with a voltage acquisition unit, a current acquisition unit and an inrush current suppression switch; the inrush current suppression switch is provided with a first electrical device and is connected with the components; the bottom end of the surge suppression switch is connected with a surge limiter and is connected with the quick actuator in parallel; the quick actuator is connected with the top end of the inrush current suppression switch in parallel and is connected with the bottom end of the inrush current suppression switch in parallel to form a three-phase outgoing line end; the three-phase outlet terminal is provided with a second electric device; the secondary control system is connected with the voltage acquisition unit and the current acquisition unit. The utility model realizes the inhibition of generating higher overvoltage and larger excitation surge current through the real-time monitoring and the mutual coordination of the acquisition unit, the execution system and the secondary control system.
Description
Technical Field
The utility model relates to the technical field of electrical systems, in particular to an excitation surge current suppression system.
Background
At present, exciting inrush current suppression devices based on microcomputer controllers are increasingly applied to power systems.
The exciting inrush current is mainly generated when the current applied to the primary or secondary winding of the power transformer and the capacitor suddenly increases (i.e. when no-load switching-on), and the existence of the exciting inrush current brings a certain negative influence to the power system, so that the system voltage is temporarily reduced for a short time, and the normal operation of other electrical equipment in the system is influenced; and secondly, the microcomputer protection device in the power system can malfunction and override trip, so that large-area production and power failure can be caused.
The common inrush current controller is mainly used for preventing the malfunction of the medium-high voltage protection switch. When the switch is closed or the power grid is in a working state and surge current is formed on the line, the surge current controller can monitor the line current and perform delay tripping control to prevent misoperation of the switch caused by surge from tripping. The inrush current controller adopts a micro-control technology, and immediately performs quick-break protection when the current exceeds the set speed-doubling setting current, and can also perform delay setting according to the requirement.
The defects that the secondary current adjustment range is small, the surge delay time is limited by adjustment, the execution speed is slow, and the operation from one-time closing to a fault point is not performed are commonly existed in the middle-high voltage surge controller in the market at present, and the secondary microcomputer type surge suppressor amplifies the constant value of relay protection, so that the principle that the reliability, sensitivity, selectivity and quick action of relay protection in a power system are most basic is sacrificed, the constant value matching of a protection device cannot be adjusted, and the problem of exciting surge cannot be fundamentally solved.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and adopts an excitation surge suppression system to solve the problems in the background art.
An excitation surge suppression system comprises a surge rapid identification system, an overvoltage suppressor, a live display system and a secondary control system:
the internal terminal box of the surge quick identification system is connected with a voltage acquisition unit, a current acquisition unit and a surge suppression switch;
the top end of the inrush current suppression switch is provided with a first electric device, and the first electric device is connected with the voltage acquisition unit, the current acquisition unit and the inrush current suppression switch;
the bottom end of the surge suppression switch is connected with a surge limiter and is connected with the quick actuator in parallel;
the top end of the quick actuator is connected with the top end of the inrush current suppression switch in parallel through a three-phase copper bus, and a three-phase outlet end is formed by connecting the three-phase copper bus with the bottom end of the inrush current suppressor in parallel;
the three-phase wire outlet end is connected with the overvoltage suppressor and the electrified display system through bolts, and is provided with a second electric device;
the secondary control system is connected with the voltage acquisition unit and the current acquisition unit and is used for acquiring secondary voltage and current signals.
As a further aspect of the utility model: the high-voltage end of the voltage acquisition unit is connected with the power supply side of the high-voltage system.
As a further aspect of the utility model: the bottom end of the surge suppression switch is connected with a surge limiter, and after the surge suppression switch is connected with the surge suppressor in series, the surge suppression switch and the surge suppressor are connected with the quick actuator in parallel.
As a further aspect of the utility model: the surge suppression system is provided with a heat dissipation system and a temperature control device, and the heat dissipation system is connected with the temperature control device.
As a further aspect of the utility model: the fast actuator employs a fast switch of an eddy current drive mechanism.
As a further aspect of the utility model: the opening time of the rapid actuator is less than or equal to 5ms, and the closing time is less than or equal to 10ms.
As a further aspect of the utility model: the fault recognition time of the inrush current rapid recognition system is less than 2ms.
Compared with the prior art, the utility model has the following technical effects:
by adopting the technical scheme, the rapid operation of the inrush current rapid identification system is utilized, the fault identification time is less than 2ms, and is less than 1/10 of a cycle, so that the inrush current inhibition switch is controlled to be switched on rapidly, the inrush current inhibitor is connected in series in the main loop, the excitation inrush current of the main loop is limited, the excitation inrush current is limited to 2 times of rated current of the transformer from 8 times of rated current of the transformer at the moment of switching on, and the potential safety hazard of system override tripping is solved.
Meanwhile, the quick actuator of the phase control technology is switched on in 5ms after receiving a switching-off command of the inrush current quick identification system, so that the exciting inrush current of a main loop is limited, the exciting inrush current is limited to 2 times of rated current of a transformer at the moment of switching on from 8 times of rated current of the transformer, and the potential safety hazard of system override trip is solved.
Drawings
The following detailed description of specific embodiments of the utility model refers to the accompanying drawings, in which:
FIG. 1 is a cross-sectional view of a suppression system according to an embodiment of the disclosure;
FIG. 2 is a perspective view of a suppression system according to an embodiment of the disclosure;
FIG. 3 is a front view of a suppression system according to an embodiment of the disclosure;
fig. 4 is a partial enlarged view at a in fig. 1 according to an embodiment of the present disclosure.
In the figure: 1. a main chassis; 2. a current collection unit; 3. a heat dissipation system; 4. an overvoltage suppressor; 5. a surge suppression switch; 6. a surge limiter; 7. a surge current rapid identification system; 8. a live display system; 9. a voltage acquisition unit; 10. a fast actuator; 11. a wire outlet end; 12. and a temperature control device.
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 and 2, in an embodiment of the present utility model, an excitation surge suppression system includes a main chassis, a surge quick recognition system, an overvoltage suppressor, a live display system, and a secondary control system:
the internal terminal box of the surge quick identification system is connected with a voltage acquisition unit, a current acquisition unit and a surge suppression switch;
the top end of the inrush current suppression switch is provided with a first electric device, and the first electric device is connected with the voltage acquisition unit, the current acquisition unit and the inrush current suppression switch;
the bottom end of the surge suppression switch is connected with a surge limiter and is connected with the quick actuator in parallel;
the top end of the quick actuator is connected with the top end of the inrush current suppression switch in parallel through a three-phase copper bus, and a three-phase outlet end is formed by connecting the three-phase copper bus with the bottom end of the inrush current suppressor in parallel;
the three-phase wire outlet end is connected with the overvoltage suppressor and the electrified display system through bolts, and is provided with a second electric device;
the secondary control system is connected with the voltage acquisition unit and the current acquisition unit and is used for acquiring secondary voltage and current signals.
As shown in fig. 3, a front view of a mainframe box of the suppression system is illustrated;
in this embodiment, the high voltage end of the voltage acquisition unit is connected to the power supply side of the high voltage system.
In this embodiment, the bottom end of the surge suppression switch is connected to a surge limiter, and after the surge suppression switch and the surge suppressor are connected in series, the surge suppression switch and the surge suppressor are connected in parallel with the fast actuator.
In this embodiment, the inrush current suppression system is provided with a heat dissipation system and a temperature control device, and the heat dissipation system is connected with the temperature control device.
In this embodiment, as shown in fig. 4, the diagram is an enlarged diagram of a fast actuator, and the fast actuator adopts a fast switch of an eddy current driving mechanism, so that when a transformer or a capacitor bank needs to be put into operation, accurate phase switching on of A, B, C three phases can be realized, and three-phase excitation surge current is completely eliminated. The opening time of the rapid actuator is less than or equal to 5ms, and the closing time is less than or equal to 10ms.
In this embodiment, the fault recognition time of the inrush current rapid recognition system is less than 2ms, in a specific embodiment, less than 1/10 of a cycle, so that the inrush current inhibitor switch is controlled to be switched on rapidly, the inrush current inhibitor is connected in series in the main loop, and the excitation inrush current of the main loop is limited, so that the excitation inrush current is limited to 2 times of rated current of the transformer from 8 times of rated current of the transformer at the moment of switching on, and the potential safety hazard of system override trip is solved.
In this embodiment, the working process of the inrush current rapid identification system is as follows:
accessing the system into an electrical equipment system needing to inhibit closing inrush current;
before the system operates, the power supply side voltage is monitored in real time through the inrush current rapid identification system, and under the condition that the power supply side voltage and the closing state of the incoming line breaker are normal, an inrush current suppression switch is closed, and an inrush current limiter is connected in series into a closing loop to suppress an inrush current;
after the inrush current inhibition switch is detected to be closed in place and the exciting inrush current is limited to be within a specified range, the quick actuator of the phase-closing control technology is closed, the inrush current inhibition switch is opened to form a main loop, and the inrush current inhibition is completed.
In this embodiment, the inrush current rapid identification system adopts a three-phase voltage angle synchronous tracking technology, calculates the respective time of sending out the three-phase closing instruction according to the time of the closing action of the rapid actuator and the suppression type of the rapid actuator of the preset phase control technology after receiving the closing instruction, and issues the closing instruction after the corresponding time arrives, so as to complete the rapid switching three-phase synchronous closing within 30 ms.
In this embodiment, after receiving the closing instruction, the inrush current rapid identification system sends a command of closing an inrush current suppression switch, and then strings into an inrush current limiter, and after the inrush current is suppressed, sends a command of closing the rapid switch at the same time, and the three phases are simultaneously closed to switch on the main loop.
In the embodiment, according to national standard document regulations, the transformer generates exciting surge current of 7-12 times rated current at no-load closing moment, the current causes switch override tripping in the system and causes large-area power failure accidents of enterprises, and the exciting surge suppression system is additionally arranged on the power supply side of equipment to limit closing exciting surge current to rated current of the transformer, so that override tripping of the switch is avoided, and power supply continuity and safe production of the enterprises are ensured.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (7)
1. An excitation surge suppression system, comprising a surge rapid identification system, an overvoltage suppressor, a live display system, and a secondary control system:
the internal terminal box of the surge quick identification system is connected with a voltage acquisition unit, a current acquisition unit and a surge suppression switch;
the top end of the inrush current suppression switch is provided with a first electric device, and the first electric device is connected with the voltage acquisition unit, the current acquisition unit and the inrush current suppression switch;
the bottom end of the surge suppression switch is connected with a surge limiter and is connected with the quick actuator in parallel;
the top end of the quick actuator is connected with the top end of the inrush current suppression switch in parallel through a three-phase copper bus, and a three-phase outlet end is formed by connecting the three-phase copper bus with the bottom end of the inrush current suppressor in parallel;
the three-phase wire outlet end is connected with the overvoltage suppressor and the electrified display system through bolts, and is provided with a second electric device;
the secondary control system is connected with the voltage acquisition unit and the current acquisition unit and is used for acquiring secondary voltage and current signals.
2. The excitation surge suppression system of claim 1, wherein the high voltage terminal of the voltage acquisition unit is connected to a power supply side of the high voltage system.
3. The system of claim 1, wherein the surge suppressor is connected to a surge limiter at a bottom end of the surge suppressor, and the surge suppressor is connected in series with the fast actuator in end-to-end connection.
4. The excitation surge suppression system of claim 3, wherein the surge suppression system is provided with a heat dissipation system and a temperature control device, and wherein the heat dissipation system is connected with the temperature control device.
5. The excitation surge suppression system of claim 3, wherein the fast actuator employs a fast switch of an eddy current drive mechanism.
6. The excitation surge suppression system according to claim 1, wherein the quick actuator has a switching-off time of less than or equal to 5ms and a switching-on time of less than or equal to 10ms.
7. The excited inrush current suppression system of claim 1, wherein the fault identification time of said inrush current quick identification system is less than 2ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320372932.3U CN219372016U (en) | 2023-02-27 | 2023-02-27 | Excitation surge current suppression system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320372932.3U CN219372016U (en) | 2023-02-27 | 2023-02-27 | Excitation surge current suppression system |
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| Publication Number | Publication Date |
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| CN219372016U true CN219372016U (en) | 2023-07-18 |
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| CN202320372932.3U Active CN219372016U (en) | 2023-02-27 | 2023-02-27 | Excitation surge current suppression system |
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| CN (1) | CN219372016U (en) |
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2023
- 2023-02-27 CN CN202320372932.3U patent/CN219372016U/en active Active
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