CN219477583U - Zero-loss depth current limiting device - Google Patents
Zero-loss depth current limiting device Download PDFInfo
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- CN219477583U CN219477583U CN202320408845.9U CN202320408845U CN219477583U CN 219477583 U CN219477583 U CN 219477583U CN 202320408845 U CN202320408845 U CN 202320408845U CN 219477583 U CN219477583 U CN 219477583U
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Abstract
The application discloses a zero-loss depth current limiting device, which belongs to the technical field of power protection devices and comprises a reactor, a split-phase controller, a high-speed switch, a Rogown coil and a return coil, wherein the high-speed switch is connected in series in a bus circuit of a power supply loop, the reactor is connected in parallel with the high-speed switch in the bus circuit, the Rogown coil is connected in series in a shunt of the high-speed switch, and the return coil is arranged on a bus of the power supply loop; the control end of the split-phase controller is electrically connected with the control end of the high-speed switch, and the output end of the Rogowski coil is electrically connected with the input end of the split-phase controller; the circuit breaker comprises a power supply circuit, a control unit, a phase separation controller, a power supply circuit, a control unit and a control unit, and also comprises a circuit breaking module and a driving voltage module, wherein the circuit breaking module is arranged on a bus of the power supply circuit, the output end of the driving voltage module is electrically connected with the input end of the control unit in the circuit breaking module, and the control end of the phase separation controller is electrically connected with the control end of the driving voltage module. According to the power supply circuit, when the circuit is short-circuited and the reactor is in fault, the power supply circuit is disconnected, and the possibility of damage to circuit elements can be reduced.
Description
Technical Field
The application relates to the technical field of power protection devices, in particular to a zero-loss depth current limiting device.
Background
In the operation of the power system, the insulation failure of components in the circuit operation is likely to occur, the short circuit current is generally several times or even tens times of rated current, and the damage to circuit equipment is caused, so that a current limiting device is often arranged in the power system to help the fault branch switch to be opened.
The zero-loss depth current limiting device comprises a reactor, a split-phase controller, a high-speed switch, a Roke coil and a return coil, wherein the high-speed switch is connected in series in a bus circuit of a power supply loop, the reactor is connected in parallel with the high-speed switch in the bus circuit of the power supply loop, the Roke coil for detecting shunt current of the high-speed switch is connected in series in a shunt of the high-speed switch, and the return coil for detecting current of the bus circuit of the power supply loop is arranged on a bus; the control end of the split-phase controller is electrically connected with the control end of the high-speed switch, and the output end of the Rogowski coil is electrically connected with the input end of the split-phase controller.
In the zero-loss deep current limiting device, a Rogown coil continuously carries out a current acquisition device on three-phase current of a system, and in a conventional state, a split-phase controller controls a high-speed switch to be in a closing state, at the moment, a reactor is short-circuited, and a circuit normally operates; the Roke coil outputs a current signal to the split-phase controller, and when the split-phase controller judges that the current is larger than a preset value, the split-phase controller sends a split-gate instruction to control the high-speed switch to split gate, at the moment, the reactor is switched on, and the short-circuit current is limited, so that the short-circuit fault can be eliminated; when the short-circuit fault is eliminated, the return coil outputs a current signal to the split-phase controller, and the split-phase controller judges that the current signal is smaller than a preset value and sends a closing instruction to control the high-speed switch to close.
With respect to the related art described above, the inventors consider that there are the following drawbacks: after the reactor breaks down or damages, if a short circuit fault occurs in the circuit, the split-phase controller can control the high-speed switch to switch off in response to the switch-off detection signal, and at the moment, the reactor is difficult to limit the short circuit current, and the circuit element is possibly damaged.
Disclosure of Invention
To reduce the likelihood of damage to circuit elements, the present application provides zero loss deep current limiting devices.
The zero-loss depth current limiting device provided by the application adopts the following technical scheme:
the zero-loss depth current limiting device comprises a reactor, a split-phase controller, a high-speed switch, a Rogown coil and a return coil, wherein the high-speed switch is connected in series in a bus circuit of a power supply loop, the reactor and the high-speed switch are connected in parallel in the bus circuit, the Rogown coil is connected in series in a shunt of the high-speed switch, and the return coil is arranged on a bus of the power supply loop;
the control end of the split-phase controller is electrically connected with the control end of the high-speed switch, and the output end of the Rogowski coil is electrically connected with the input end of the split-phase controller;
the phase separation controller is characterized by further comprising a circuit breaking module and a driving voltage module, wherein the circuit breaking module is arranged on a bus of the power supply loop, the output end of the driving voltage module is electrically connected with the input end of the circuit breaking module, and one control end of the phase separation controller is electrically connected with the control end of the driving voltage module.
By adopting the technical scheme, under the normal state, the return coil detects that the current is smaller than the preset value, the return coil sends a conduction detection signal to the split-phase controller, and the split-phase controller responds to the conduction detection signal to enable the circuit breaking module to conduct the current;
when the reactor breaks down or is damaged, under the condition that the circuit breaks down, in order to reduce the possibility of damage to the circuit element, the return coil detects that the current is larger than a preset value, the return coil sends a disconnection detection signal to the split-phase controller, and the split-phase controller responds to the disconnection detection signal to enable the disconnection module to disconnect the current, so that the short-circuit current in the system can be disconnected, and the purpose of reducing the possibility of damage to the circuit element is achieved.
Preferably, the driving voltage module comprises a direct current power supply and an NMOS tube, and the direct current power supply is connected with the output end of the split-phase controller;
the grid electrode of the NMOS tube is connected with the direct current power supply, the drain electrode of the NMOS tube is electrically connected with the input end of the circuit breaking module, and the source electrode of the NMOS tube is grounded.
Through adopting above-mentioned technical scheme, through the effect of DC power supply and NMOS pipe for the phase separation controller can drive the operation of circuit breaking module.
Preferably, the driving voltage module further includes a pull-up resistor R1, one end of the pull-up resistor R1 is connected to the dc power supply, and the other end of the pull-up resistor R1 is connected to the output end of the split-phase controller.
By adopting the technical scheme, the current input into the NMOS tube can be maintained at a high level by utilizing the function of the pull-up resistor R1, and meanwhile, the current limiting function is realized.
Preferably, the driving voltage module further comprises a diode D1 and a divider resistor R2, wherein the positive electrode of the diode D1 is connected with the output end of the split-phase controller, and the negative electrode of the diode D1 is connected with the grid electrode of the NMOS tube;
one end of the voltage dividing resistor R2 is connected with the cathode of the diode D1, and the other end of the voltage dividing resistor R2 is connected with the source electrode of the NMOS tube.
By adopting the technical scheme, the possibility of reverse current flowing can be reduced by utilizing the action of the diode D1, and the possibility of breakdown of the NMOS tube can be reduced when the current flowing through the diode D1 is overlarge under the action of the divider resistor R2.
Preferably, the driving voltage module further includes a current limiting resistor R3, one end of the current limiting resistor R3 is connected to the source of the NMOS, and the other end of the current limiting resistor R3 is grounded.
Through adopting above-mentioned technical scheme, utilize current-limiting resistor R3, can play the restriction effect to the electric current that flows out the NMOS pipe, reduce the excessive current and make the possibility that the circuit breaking module received the damage.
Preferably, the circuit breaking module comprises a vacuum circuit breaker, the vacuum circuit breaker is connected in series on a bus of the power supply loop, and the output end of the driving voltage module is electrically connected with the input end of the control unit in the vacuum circuit breaker.
Through adopting above-mentioned technical scheme, under vacuum circuit breaker's effect, can be convenient for control the break-make of power supply loop through driving voltage module.
Preferably, the circuit breaking module comprises a TST valve plate combination device, the TST valve plate combination device is connected in series on a bus of the power supply loop, and the output end of the driving voltage module is electrically connected with the input end of the control unit in the TST valve plate combination device.
Through adopting above-mentioned technical scheme, utilize TST valve block composite set's effect, can be convenient for control the break-make of power supply loop through driving voltage module.
In summary, the present application includes at least the following beneficial technical effects:
1. under the normal state, the return coil detects that the current is smaller than a preset value, the return coil sends a conduction detection signal to the split-phase controller, and the split-phase controller responds to the conduction detection signal to enable the circuit breaking module to conduct the current;
when the reactor is failed or damaged, under the condition that a short circuit fault is generated in a circuit, in order to reduce the possibility of damage to a circuit element, the return coil detects that the current is larger than a preset value, the return coil sends a disconnection detection signal to the split-phase controller, and the split-phase controller responds to the disconnection detection signal to enable the disconnection module to disconnect the current, so that the short circuit current in the system can be disconnected, and the aim of reducing the possibility of damage to the circuit element is fulfilled;
2. the phase separation controller can drive the circuit breaking module to operate under the action of the direct current power supply and the NMOS tube;
3. by utilizing the effect of the pull-up resistor R1, the current input into the NMOS tube can be maintained at a high level, and meanwhile, the current limiting effect is achieved.
Drawings
Fig. 1 is a circuit schematic of the whole embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a driving voltage module according to an embodiment of the disclosure.
Fig. 3 is a block diagram of a system under normal conditions in the first embodiment of the present application.
Fig. 4 is a system block diagram of a circuit in accordance with the first embodiment of the present application when a short circuit fault occurs.
Fig. 5 is a system block diagram when a reactor fails in the first embodiment of the present application.
Fig. 6 is a schematic circuit diagram of a TST valve block assembly according to a second embodiment of the present disclosure.
Reference numerals illustrate:
1. a reactor; 2. a split-phase controller; 3. a high-speed switch; 4. a rogowski coil; 5. a return coil; 6. a circuit breaking module; 7. a driving voltage module; 8. a conductive plate; 81. a connection hole; 9. a shielding cover; 91. and a rubber layer.
Description of the embodiments
The present application is described in further detail below in conjunction with figures 1-6.
Embodiment one:
the embodiment of the application discloses a zero-loss depth current limiting device. Referring to fig. 1, the zero-loss deep current limiting device includes a reactor 1, a split-phase controller 2, a high-speed switch 3, a roc coil 4, a return coil 5, a circuit breaking module 6, and a driving voltage module 7, wherein the high-speed switch 3 and the reactor 1 are connected in parallel in a bus circuit, the roc coil 4 is connected in series in a shunt of the high-speed switch 3, and the return coil 5 is mounted on the bus;
the control end of the split-phase controller 2 is electrically connected with the control end of the high-speed switch 3, and the output end of the Rogowski coil 4 is electrically connected with the input end of the split-phase controller 2;
in this embodiment, the circuit breaker module 6 is a vacuum circuit breaker, the vacuum circuit breaker is mounted on a bus, the output end of the driving voltage module 7 is electrically connected with the input end of the vacuum circuit breaker, and one of the control ends of the split-phase controller 2 is electrically connected with the control end of the driving voltage module 7.
As shown in fig. 2, the driving voltage module 7 comprises a direct current power supply and an NMOS tube, the output voltage of the direct current power supply is 5V, and the direct current power supply is connected with the output end of the split-phase controller 2;
the grid of the NMOS tube is connected with a direct current power supply, the drain electrode of the NMOS tube is electrically connected with the input end of the vacuum circuit breaker, and the source electrode of the NMOS tube is grounded.
As shown in fig. 2, the driving voltage module 7 further includes a pull-up resistor R1, one end of the pull-up resistor R1 is connected with a dc power supply, the other end of the pull-up resistor R1 is connected with a connection point between the split-phase controller 2 and the NMOS transistor, and by using the effect of the pull-up resistor R1, the current input into the NMOS transistor can be kept at a high level.
As shown in fig. 2, the driving voltage module 7 further includes a diode D1 and a voltage dividing resistor R2, wherein the positive electrode of the diode D1 is connected with the connection point of the split-phase controller 2 and the pull-up resistor R1, and the negative electrode of the diode D1 is connected with the gate of the NMOS tube;
one end of the divider resistor R2 is connected with the connection point of the diode D1 and the NMOS tube, the other end of the divider resistor R2 is connected with the source electrode of the NMOS tube, and the possibility that the NMOS tube is broken down when the current is overlarge can be reduced by utilizing the functions of the diode D1 and the divider resistor R2.
As shown in fig. 2, the driving voltage module 7 further includes a current limiting resistor R3, one end of the current limiting resistor R3 is connected with the source of the NMOS tube, and the other end of the current limiting resistor R3 is grounded, so that the current flowing out of the NMOS tube can be limited by using the current limiting resistor R3, and the possibility that the vacuum circuit breaker is damaged due to overlarge current is reduced.
As shown in fig. 1, 2 and 3, the roc coil 4 continuously detects three-phase current of the system, when the circuit operates normally, the current detected by the roc coil 4 is smaller than a preset value, the roc coil 4 sends a closing detection signal to the split-phase controller 2, the split-phase controller 2 responds to the closing detection signal and controls the high-speed switch 3 to keep closing, and at the moment, the reactor 1 is bypassed; meanwhile, the current detected by the return coil 5 is smaller than a preset value, the return coil 5 sends a closing detection signal and a conduction detection signal to the split-phase controller 2, and the split-phase controller 2 responds to the conduction detection signal to control the driving voltage module 7, so that the vacuum circuit breaker keeps the conduction state of the circuit, and the normal operation of the circuit is ensured.
As shown in fig. 1, 2 and 4, when a short-circuit fault occurs in a circuit, the current detected by the roc coil 4 is greater than a preset value, the roc coil 4 sends a switching-off detection signal to the split-phase controller 2, the split-phase controller 2 responds to the switching-off detection signal to control the high-speed switch 3 to switch off, at the moment, the reactor 1 is connected into the circuit, and the current of the circuit is limited under the action of the reactor 1, so that the short-circuit fault of the circuit can be eliminated; after the circuit current is limited, the current detected by the return coil 5 is smaller than a preset value, the return coil 5 sends a closing detection signal and a conduction detection signal to the split-phase controller 2, and on one hand, the split-phase controller 2 responds to the closing detection signal to control the high-speed switch 3 to reclose, so that the reactor 1 is bypassed again, and the system circuit works normally again; on the other hand, the split-phase controller 2 responds to the conduction detection signal to control the driving voltage module 7, so that the vacuum circuit breaker keeps the conduction state of the circuit, and the normal operation of the circuit is ensured.
As shown in fig. 1, 2 and 5, when a short circuit fault occurs in a circuit and a reactor 1 is failed or damaged, after the reactor 1 is connected into the circuit, the reactor 1 cannot limit the circuit current, on the one hand, a protection program is arranged in a split-phase controller 2, and when a closing detection signal is not received in excess of 2S, the protection program enables the split-phase controller 2 to control a high-speed switch 3 to close so as to play a role in protecting the reactor 1; on the other hand, at this time, the current detected by the return coil 5 is greater than the preset value, the return coil 5 transmits an off detection signal to the phase-separation controller 2, and the phase-separation controller 2 controls the driving voltage module 7 in response to the off detection signal, so that the vacuum circuit breaker is started, and the system circuit is disconnected, thereby being able to reduce the possibility of damage to the circuit elements.
The implementation principle of the zero-loss depth current limiting device in the embodiment of the application is as follows: by providing the driving voltage module 7 and the vacuum circuit breaker, when a short-circuit fault occurs in the circuit and the reactor 1 fails or is damaged, the driving voltage module 7 is caused to drive the vacuum circuit breaker to open the circuit, so that the possibility of damage to the circuit elements can be reduced.
Embodiment two:
as shown in fig. 6, the only difference between the second embodiment and the first embodiment of the present application is that the breaking module 6 is a TST valve plate assembly device.
The implementation principle of the second zero-loss depth current limiting device in the embodiment of the application is as follows: by arranging the driving voltage module 7 and the TST valve block combination device, when the circuit generates a short circuit fault and the reactor 1 fails or is damaged, the driving voltage module 7 drives the TST valve block combination device to disconnect the circuit, so that the possibility of damage to circuit elements can be reduced.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (7)
1. The zero-loss depth current limiting device comprises a reactor (1), a split-phase controller (2), a high-speed switch (3), a Rogowski coil (4) and a return coil (5), wherein the high-speed switch (3) is connected in series in a bus circuit of a power supply loop, the reactor (1) and the high-speed switch (3) are connected in parallel in the bus circuit, the Rogowski coil (4) is connected in series in a shunt of the high-speed switch (3), and the return coil (5) is arranged on a bus of the power supply loop;
the control end of the split-phase controller (2) is electrically connected with the control end of the high-speed switch (3), and the output end of the Rogowski coil (4) is electrically connected with the input end of the split-phase controller (2);
the method is characterized in that: the phase separation controller is characterized by further comprising a circuit breaking module (6) and a driving voltage module (7), wherein the circuit breaking module (6) is arranged on a bus of a power supply loop, the output end of the driving voltage module (7) is electrically connected with the input end of the circuit breaking module (6), and one control end of the phase separation controller (2) is electrically connected with the control end of the driving voltage module (7).
2. The zero-loss depth current limiting device of claim 1, wherein: the driving voltage module (7) comprises a direct current power supply and an NMOS tube, and the direct current power supply is connected with the output end of the split-phase controller (2);
the grid electrode of the NMOS tube is connected with the direct current power supply, the drain electrode of the NMOS tube is electrically connected with the input end of the breaking module (6), and the source electrode of the NMOS tube is grounded.
3. The zero-loss depth current limiting device of claim 2, wherein: the driving voltage module (7) further comprises a pull-up resistor R1, one end of the pull-up resistor R1 is connected with the direct current power supply, and the other end of the pull-up resistor R1 is connected with the output end of the split-phase controller (2).
4. A zero loss depth current limiting device according to claim 3, wherein: the driving voltage module (7) further comprises a diode D1 and a divider resistor R2, the positive electrode of the diode D1 is connected with the output end of the split-phase controller (2), and the negative electrode of the diode D1 is connected with the grid electrode of the NMOS tube;
one end of the voltage dividing resistor R2 is connected with the cathode of the diode D1, and the other end of the voltage dividing resistor R2 is connected with the source electrode of the NMOS tube.
5. The zero-loss depth current limiting device of claim 2, wherein: the driving voltage module (7) further comprises a current limiting resistor R3, one end of the current limiting resistor R3 is connected with the source electrode of the NMOS tube, and the other end of the current limiting resistor R3 is grounded.
6. The zero-loss depth current limiting device of claim 1, wherein: the circuit breaking module (6) comprises a vacuum circuit breaker which is connected in series on a bus of the power supply loop, and the output end of the driving voltage module (7) is electrically connected with the input end of the control unit in the vacuum circuit breaker.
7. The zero-loss depth current limiting device of claim 1, wherein: the circuit breaking module (6) comprises a TST valve block combination device, the TST valve block combination device is connected in series on a bus of the power supply loop, and the output end of the driving voltage module (7) is electrically connected with the input end of the control unit in the TST valve block combination device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320408845.9U CN219477583U (en) | 2023-03-02 | 2023-03-02 | Zero-loss depth current limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320408845.9U CN219477583U (en) | 2023-03-02 | 2023-03-02 | Zero-loss depth current limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219477583U true CN219477583U (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320408845.9U Active CN219477583U (en) | 2023-03-02 | 2023-03-02 | Zero-loss depth current limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219477583U (en) |
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2023
- 2023-03-02 CN CN202320408845.9U patent/CN219477583U/en active Active
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