CN213817228U - Solid-state circuit breaker - Google Patents
Solid-state circuit breaker Download PDFInfo
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- CN213817228U CN213817228U CN202021921390.3U CN202021921390U CN213817228U CN 213817228 U CN213817228 U CN 213817228U CN 202021921390 U CN202021921390 U CN 202021921390U CN 213817228 U CN213817228 U CN 213817228U
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- circuit breaker
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Abstract
The utility model provides a solid-state circuit breaker, includes mechanical switch, control circuit, power electronic device and electrical unit, mechanical switch includes contact mechanism and the control coil who drives contact mechanism, and contact mechanism includes main contact and auxiliary contact, main contact, electrical unit connect the input at the circuit breaker, and power electronic device establish ties between the output of main contact and circuit breaker, and electrical unit and control circuit are connected and are used for supplying power for control circuit, and auxiliary contact, control coil are connected with control circuit respectively, and power electronic device is connected with control circuit, drives mechanical switch, power electronic device action after control circuit received control signal, and control circuit has memory cell, is resumeed the back after control circuit power supply interruption, and control circuit drives mechanical switch and power electronic device through reading control signal in the memory cell. The defect that the solid-state circuit breaker needs to be reclosed from external operation after power failure is overcome, and the operation is convenient.
Description
Technical Field
The utility model relates to a circuit breaker field, concretely relates to solid state circuit breaker.
Background
The solid-state circuit breaker is more and more widely applied to a flexible alternating current transmission system due to the fact that the solid-state circuit breaker has quick on-off performance, reliability and repeated operability, and the stability and the reliability of a power system are greatly improved through cooperation with other devices. The existing solid-state circuit breaker can not be completely separated from a mechanical switch, the solid-state circuit breaker is generally required to be equipped with the mechanical switch to be used as electrical isolation, leakage current generated by power electronic devices can be avoided by disconnecting the mechanical switch, but the solid-state circuit breaker is generally powered from a main circuit, an electromagnetic mechanical switch in the solid-state circuit breaker can also be disconnected after the main circuit is powered off, and at the moment, if the solid-state circuit breaker needs to be powered on again, the external switching-on operation is required again, and the operation is very inconvenient.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a solid state circuit breaker that need not reclose after falling the electricity.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a solid-state circuit breaker, includes mechanical switch, control circuit, power electronic device and electrical unit, mechanical switch includes the control coil of contact mechanism and drive contact mechanism action, contact mechanism includes main contact, at least one and the supplementary contact of main contact synchronization action, the input at the circuit breaker is connected to the one end of main contact, electrical unit's one end, and power electronic device establishes ties on the main line between the other end of main contact and the output of circuit breaker, and electrical unit's the other end is connected with control circuit and is used for the power supply for control circuit, and supplementary contact is connected with control circuit and is used for the action state of feedback contact mechanism, and control coil is connected with control circuit and makes contact mechanism action under control circuit's drive, power electronic device is connected with control circuit, drives mechanical switch after control circuit received control signal, Power electronics operation;
the control circuit is provided with a memory unit, and after the control circuit is recovered after the power supply is interrupted, the control circuit drives the mechanical switch and the power electronic device by reading a control signal before the power interruption in the memory unit.
Preferably, the power supply further comprises a current detection unit, wherein the current detection unit is connected between the mechanical switch and the power electronic device, and the current detection unit is connected with the control circuit and used for transmitting a current signal to the control circuit.
Preferably, the control circuit is further connected with a human-computer interface, and the human-computer interface is used for sending a control signal for controlling the opening and closing of the circuit breaker to the control circuit.
Preferably, the control circuit is further connected with a communication unit, the communication unit is connected with an external upper computer, and the communication unit is used for transmitting a control signal generated by the upper computer and used for controlling the opening and closing of the circuit breaker to the control circuit.
Preferably, the control circuit is further connected with a dial switch, and the dial switch transmits a control signal for controlling the opening and closing of the circuit breaker to the control circuit.
The utility model discloses a solid-state circuit breaker is provided with the memory cell who is used for taking notes circuit breaker divide-shut brake control signal in control circuit, resumes the power supply back again after control circuit power supply interruption, and control circuit drives mechanical switch, power electronics action respectively through the control signal of the preceding circuit breaker of outage in acquireing the memory cell to need follow the defect that external operation reclosed after having overcome the power failure, the operation is convenient.
In addition, the power supply unit and the mechanical switch are both connected to the input end of the circuit breaker, and the power supply unit supplies power to the control circuit and is not controlled by the mechanical switch and the power electronic appliance.
In addition, the control circuit can be controlled by a man-machine interface, or controlled by an external upper computer through a communication unit, or controlled by a dial switch.
Drawings
Fig. 1 is a schematic diagram of a solid state circuit breaker of the present invention;
fig. 2 is a schematic diagram of a first embodiment of a solid-state circuit breaker according to the present invention.
Detailed Description
The following describes a specific embodiment of a solid-state circuit breaker and a power-down processing method thereof according to the present invention with reference to the embodiments shown in fig. 1-2. The utility model discloses a solid-state circuit breaker and fall electric processing method is not limited to the description of following embodiment.
The utility model provides a solid-state circuit breaker, includes mechanical switch, control circuit, power electronic device and electrical unit, mechanical switch includes the control coil of contact mechanism and drive contact mechanism action, contact mechanism includes main contact, at least one and the supplementary contact of main contact synchronization action, the input at the circuit breaker is connected to the one end of main contact, electrical unit's one end, and power electronic device establishes ties on the main line between the other end of main contact and the output of circuit breaker, and electrical unit's the other end is connected with control circuit and is used for supplying power for control circuit, and supplementary contact is connected with control circuit and is used for the action state of feedback contact mechanism, and control coil is connected with control circuit and makes contact mechanism action in control circuit's drive, power electronic device is connected with control circuit, drives mechanical switch after control circuit received control signal, Power electronics operation;
the control circuit is provided with a memory unit, and after the control circuit is recovered after the power supply is interrupted, the control circuit drives the mechanical switch and the power electronic device by reading a control signal before the power interruption in the memory unit;
when the control circuit is normally powered on, the control circuit receives a control signal for controlling the opening and closing of the circuit breaker and stores the control signal in a memory unit of the control circuit, and the control circuit drives the mechanical switch and the power electronic device to act according to the control signal;
after the control circuit is powered off and then returns to normal power supply, the control circuit reads the control signal stored in the memory unit for the last time before the power off, and when the control signal read by the control circuit is a closing command, the control circuit respectively drives the mechanical switch and the power electronic device to act; when the control signal read by the control circuit is a switching-off command, the control circuit does not drive the mechanical switch and the power electronic device to act.
The utility model discloses a solid-state circuit breaker and fall electric processing method thereof is provided with the memory cell who is used for taking notes circuit breaker divide-shut brake control signal in control circuit, resumes the power supply back again after the control circuit power supply is interrupted, and control circuit is through the control signal who acquires the circuit breaker before the outage in the memory cell to drive mechanical switch, power electronic device action respectively according to control signal, overcome and fall the defect that the electric back needs from external operation reclosing, the operation is convenient.
In combination with fig. 1-2, a solid-state circuit breaker and a power failure processing method thereof are provided, the solid-state circuit breaker includes a mechanical switch, a control circuit, a power electronic device and a power supply unit, the mechanical switch includes a contact mechanism and a control coil for driving the contact mechanism to act, the contact mechanism includes a main contact and at least one auxiliary contact which acts synchronously with the main contact, one end of the main contact and one end of the power supply unit are connected to an input end of the circuit breaker, the power electronic device is connected in series on a main line between the other end of the main contact and an output end of the circuit breaker, the other end of the power supply unit is connected with the control circuit for supplying power to the control circuit, the power supply unit is connected upstream of the mechanical switch and the power electronic device and is not affected by the closing and opening of the mechanical switch and the power electronic device, and the auxiliary contact is connected with the control circuit for feeding back an action state of the contact mechanism, the control coil is connected with the control circuit and drives the contact mechanism to act under the drive of the control circuit, and the power electronic device is connected with the control circuit and drives the mechanical switch and the power electronic device to act after the control circuit receives the control signal. Preferably, as shown in fig. 2, a current detecting unit is further connected in series between the mechanical switch and the power electronic device, the current detecting unit is connected to the control circuit and is used for transmitting a current signal to the control circuit, and the control circuit reads the current state of the line of the circuit breaker through the current detecting unit, namely whether overload or short circuit occurs in the line of the circuit breaker, and performs protection processing when the overload or short circuit occurs to turn off the power electronic device and the mechanical switch.
When the control circuit is normally powered on, the control circuit receives a control signal for controlling the opening and closing of the circuit breaker and stores the control signal in a memory unit of the control circuit, and the control circuit drives the mechanical switch and the power electronic device to act according to the control signal;
after the control circuit is powered off and then returns to normal power supply, the control circuit reads the control signal stored in the memory unit for the last time before the power off, and when the control signal read by the control circuit is a closing command, the control circuit respectively drives the mechanical switch and the power electronic device to act; when the control signal read by the control circuit is a switching-off command, the control circuit does not drive the mechanical switch and the power electronic device to act.
The control circuit comprises a single chip microcomputer or a microprocessor MCU, and the single chip microcomputer or the microprocessor MCU is connected with the control coil, the power electronic device and the auxiliary contact. The memory unit is a memory, can be an EPROM or other memory units, is an independent memory, or is a self-contained storage space in a singlechip, can be written into the memory unit through a human-computer interface or remotely when the control circuit is normally powered, and when the control circuit is normally powered off and then returns to normal power supply, the control circuit firstly reads data of the internal memory and then carries out corresponding operation, and the operation can be a closing action or a keeping opening state. The power electronic device can be a power electronic device switch such as an IGBT power tube, a MOSFET power tube, an NPN power tube or a thyristor.
In practical application, the normal state of the control circuit for supplying power includes two conditions of being always in a normal power supply state and recovering the normal power supply after the power supply is interrupted, and the working state of the solid-state circuit breaker includes a closing state and an opening state, but after the power supply of the control circuit is interrupted, the mechanical switch and the power electronic device are in the opening state.
When the control circuit is always in a normal power supply state and the solid-state circuit breaker is in an opening state, when the control circuit obtains a closing command by receiving a control signal, the control circuit drives a mechanical switch to be closed, and then drives a power electronic device to be closed; when the power supply of the control circuit is interrupted and normal power supply is recovered, and the solid-state circuit breaker is in a switching-off state, when the control circuit obtains a switching-on command by reading a control signal stored in the memory unit, the control circuit firstly drives the mechanical switch to be closed, and then drives the power electronic device to be closed; when the control circuit is interrupted and normal power supply is recovered, the solid-state circuit breaker is in a switching-off state, and the control circuit reads the control signal stored in the memory unit to obtain a switching-off command, the control circuit does not drive the power electronic device and the mechanical switch, so that the mechanical switch and the power electronic device are in a switching-off state.
When the control circuit is always in a normal power supply state and the circuit breaker is in a closing state, and the control circuit receives a control signal to obtain a switching-off command, the control circuit firstly drives the power electronic device to be switched off and then drives the mechanical switch to be switched off.
In this embodiment, the mechanical switch preferably includes a main contact and an auxiliary contact which are operated synchronously, and the control circuit drives the contact mechanism of the mechanical switch to operate synchronously through the control coil, but the main contact and the auxiliary contact do not reach a closed state or an open state simultaneously, as shown in fig. 1-2. When the control circuit drives the control coil to enable the contact mechanism to act, the main contact is closed earlier than the auxiliary contact, and the contact mechanism is fed back to the control circuit to be in a closed state after the auxiliary contact is closed; when the control circuit drives the contact mechanism to be disconnected, the auxiliary contact of the contact mechanism is disconnected before the main contact. So, when control circuit detected the auxiliary contact closure, the main contact must be in the closure state, when control circuit detected the auxiliary contact and is in the off-state, the main contact must be in breaking process, closes through control circuit drive power electronics this moment, because power electronics speed is fast than mechanical structure, power electronics can turn off the major loop rapidly, compares the current solid state circuit breaker of realizing the main line shutoff through the mechanical switch action, the turn-off speed of this application is obviously very fast.
The main contact and the auxiliary contact are under the condition that the total stroke is the same, the opening distance of the main contact is smaller than that of the auxiliary contact, and the overtravel of the main contact is larger than that of the auxiliary contact, so that when the contact mechanism synchronously acts, the main contact is closed before the auxiliary contact, and the auxiliary contact is opened before the main contact. For example, the main contact and the auxiliary contact are triggered synchronously, the contact opening distance of the main contact is 1mm, the over travel is 2mm, the total stroke is 3mm, the contact opening distance of the auxiliary contact is 2mm, the over travel is 1mm, and the total stroke is 3 mm. In the closing process, when the main contact moves to 1mm, the main contact is closed, the auxiliary contact also runs by 1mm at the moment, but the auxiliary contact is not closed, when the main contact and the auxiliary contact both run by 2.1mm-3mm, the main contact and the auxiliary contact are both closed, and at the moment, the closing action is finished; the auxiliary contact is closed, the main contact is also closed, and the closing action is finished at the moment; in the opening process, when the return distance of the main contact and the auxiliary contact is between 1.1 mm and 1.9mm, the auxiliary contact is already opened, the main contact is in a closed state at the moment, and when the return distance of the main contact and the auxiliary contact is between 2.1mm and 3mm, the main contact and the auxiliary contact are both in an open state.
In this embodiment, the control signal received and stored by the control circuit may be from a device connected to the control circuit for driving the control circuit, or may be from a solid-state circuit breaker. Preferably, as shown in fig. 2, a communication unit is connected to the control circuit, and the communication unit may enable an external upper computer to input a switching control signal to the control circuit through wired connection or wireless connection. The control circuit may also be connected to a software control unit, in this embodiment, the software control unit is a human-machine interface, and outputs a switching control signal to the control circuit by operating the human-machine interface, and of course, a hardware device may also be used to replace the human-machine interface, for example, a dial switch is used to replace the human-machine interface to send a switching control signal to the control circuit. In addition, the human-computer interface, the communication unit and the dial switch are also provided with fault protection functions of overcurrent, short circuit, overvoltage, undervoltage and the like, and have the function of whether reclosing is performed after power failure. When the solid-state circuit breaker generates a short circuit or overload fault, the short circuit protection mechanism or the overload protection mechanism of the solid-state circuit breaker sends a brake opening command to the control circuit, the control circuit drives the power electronic device to be disconnected, and then the mechanical switch is driven to be disconnected.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (5)
1. A solid state circuit breaker, characterized by: comprises a mechanical switch, a control circuit, a power electronic device and a power supply unit, wherein the mechanical switch comprises a contact mechanism and a control coil for driving the contact mechanism to act, the contact mechanism comprises a main contact and at least one auxiliary contact which acts synchronously with the main contact, one end of the main contact and one end of a power supply unit are connected with the input end of the circuit breaker, a power electronic device is connected in series on a main line between the other end of the main contact and the output end of the circuit breaker, the other end of the power supply unit is connected with a control circuit and used for supplying power to the control circuit, the auxiliary contact is connected with the control circuit and used for feeding back the action state of the contact mechanism, a control coil is connected with the control circuit and enables the contact mechanism to act under the drive of the control circuit, the power electronic device is connected with the control circuit, and the control circuit drives the mechanical switch and the power electronic device to act after receiving the control signal;
the control circuit is provided with a memory unit, and after the control circuit is recovered after the power supply is interrupted, the control circuit drives the mechanical switch and the power electronic device by reading a control signal before the power interruption in the memory unit.
2. The solid state circuit breaker of claim 1, wherein: the power supply further comprises a current detection unit, wherein the current detection unit is connected between the mechanical switch and the power electronic device, and is connected with the control circuit and used for transmitting a current signal to the control circuit.
3. The solid state circuit breaker of claim 1, wherein: the control circuit is also connected with a human-computer interface, and the human-computer interface is used for sending a control signal for controlling the opening and closing of the circuit breaker to the control circuit.
4. The solid state circuit breaker of claim 1, wherein: the control circuit is further connected with a communication unit, the communication unit is connected with an external upper computer, and the communication unit is used for transmitting a control signal generated by the upper computer and used for controlling the opening and closing of the circuit breaker to the control circuit.
5. The solid state circuit breaker of claim 1, wherein: the control circuit is also connected with a dial switch, and the dial switch transmits a control signal for controlling the opening and closing of the circuit breaker to the control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021921390.3U CN213817228U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021921390.3U CN213817228U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213817228U true CN213817228U (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021921390.3U Active CN213817228U (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213817228U (en) |
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2020
- 2020-09-03 CN CN202021921390.3U patent/CN213817228U/en active Active
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