CN114142441A - Solid-state circuit breaker and power failure processing method thereof - Google Patents
Solid-state circuit breaker and power failure processing method thereof Download PDFInfo
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- CN114142441A CN114142441A CN202010916815.XA CN202010916815A CN114142441A CN 114142441 A CN114142441 A CN 114142441A CN 202010916815 A CN202010916815 A CN 202010916815A CN 114142441 A CN114142441 A CN 114142441A
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- control circuit
- circuit breaker
- state
- electronic device
- contact
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
Abstract
A solid-state circuit breaker and a power failure processing method thereof comprise a mechanical switch, a control circuit, a power electronic device and a power supply unit, the mechanical switch comprises a contact mechanism and a control coil for driving the contact mechanism, the contact mechanism comprises a main contact and an auxiliary contact, the main contact and the power supply unit are connected with the input end of the circuit breaker, the power electronic device is connected between the main contact and the output end of the circuit breaker in series, the power supply unit is connected with the control circuit and used for supplying power to the control circuit, the auxiliary contact and the control coil are respectively connected with the control circuit, the power electronic device is connected with the control circuit, 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, 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 the control signal in the memory unit. 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 invention relates to the field of circuit breakers, in particular to a solid-state circuit breaker and a power failure processing method thereof.
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
The invention aims to overcome the defects of the prior art and provides a solid-state circuit breaker which does not need to be reclosed after power failure and a power failure processing method thereof.
In order to achieve the purpose, the invention 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.
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 a mechanical switch and a 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.
Further, when the control circuit is normally powered and the solid-state circuit breaker is in an opening state, after the control circuit obtains a closing command through receiving or reading the memory unit, the control circuit closes a contact mechanism of a first mechanical switch, and then drives the power electronic device to close;
when the control circuit is normally powered and the solid-state circuit breaker is in a switching-off state, the control circuit does not drive the power electronic device and the mechanical switch to act after the control circuit obtains a switching-off command through the reading memory unit;
when the control circuit is normally powered and the solid-state circuit breaker is in a closing state, after the control circuit receives a switching-off command, the control circuit drives the contact mechanism of the mechanical switch to be switched off after the primary power electronic device is switched off, and the auxiliary contact is switched off earlier than the main contact.
Further, when the control circuit drives the contact mechanism to be closed, the main contact of the contact mechanism is closed before 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.
Further, the control signal received and stored by the control circuit includes a closing command, the closing command may be from a human-machine interface connected to the control circuit, or the closing command is transmitted by a communication unit connected to the control circuit, or the closing command is from a dial switch connected to the control circuit.
Further, the control signal received and stored by the control circuit comprises a brake-off command, the brake-off command can be from a human-computer interface connected with the control circuit, or the brake-off command is transmitted by a communication unit connected with the control circuit, or the brake-off command is from a dial switch connected with the control circuit, or the brake-off command is from a short-circuit protection mechanism or an overload protection mechanism of a solid state circuit breaker.
According to the solid-state circuit breaker and the power failure processing method thereof, the memory unit for recording the opening and closing control signals of the circuit breaker is arranged in the control circuit, after the power supply of the control circuit is interrupted and the power supply is recovered, the control circuit obtains the control signals of the circuit breaker before the power interruption in the memory unit and respectively drives the mechanical switch and the power electronic device to act according to the control signals, the defect that the circuit breaker needs to be re-closed from external operation after the power failure is overcome, and 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 of the present invention.
Detailed Description
The following describes a specific embodiment of a solid-state circuit breaker and a power failure processing method thereof according to the present invention with reference to the embodiments shown in fig. 1-2. A solid-state circuit breaker and a power-down processing method thereof of the present invention are not limited to the description of the following embodiments.
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.
According to the solid-state circuit breaker and the power failure processing method thereof, the memory unit for recording the opening and closing control signals of the circuit breaker is arranged in the control circuit, after the power supply of the control circuit is interrupted and the power supply is recovered, the control circuit obtains the control signals of the circuit breaker before the power interruption in the memory unit and respectively drives the mechanical switch and the power electronic device to act according to the control signals, the defect that the circuit breaker needs to be re-closed from external operation after the power failure is overcome, and 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 invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
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.
6. A power failure processing method of a solid-state circuit breaker is characterized by comprising the following steps: the solid-state circuit breaker comprises the solid-state circuit breaker according to any one of claims 1-5, wherein when the control circuit is normally powered, 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 a mechanical switch and a 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.
7. The power-down processing method of the solid-state circuit breaker according to claim 6, characterized in that: when the control circuit is normally powered and the solid-state circuit breaker is in an opening state, after the control circuit obtains a closing command through receiving or reading the memory unit, the control circuit closes a contact mechanism of a primary mechanical switch, and then drives a power electronic device to close;
when the control circuit is normally powered and the solid-state circuit breaker is in a switching-off state, the control circuit does not drive the power electronic device and the mechanical switch to act after the control circuit obtains a switching-off command through the reading memory unit;
when the control circuit is normally powered and the solid-state circuit breaker is in a closing state, after the control circuit receives a switching-off command, the control circuit drives the contact mechanism of the mechanical switch to be switched off after the primary power electronic device is switched off, and the auxiliary contact is switched off earlier than the main contact.
8. The power-down processing method of the solid-state circuit breaker according to claim 7, characterized in that: when the control circuit drives the contact mechanism to be closed, the main contact of the contact mechanism is closed before 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.
9. The power failure processing method of the solid-state circuit breaker according to claim 6 or 7, characterized in that: the control signal received and stored by the control circuit comprises a closing command, wherein the closing command can come from a human-computer interface connected with the control circuit, or the closing command is transmitted by a communication unit connected with the control circuit, or the closing command comes from a dial switch connected with the control circuit.
10. The power failure processing method of the solid-state circuit breaker according to claim 6 or 7, characterized in that: the control signal received and stored by the control circuit comprises a brake-separating command, wherein the brake-separating command can be from a human-computer interface connected with the control circuit, or the brake-separating command is transmitted by a communication unit connected with the control circuit, or the brake-separating command is from a dial switch connected with the control circuit, or the brake-separating command is from a short-circuit protection mechanism or an overload protection mechanism of a solid state circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916815.XA CN114142441A (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker and power failure processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916815.XA CN114142441A (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker and power failure processing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114142441A true CN114142441A (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010916815.XA Pending CN114142441A (en) | 2020-09-03 | 2020-09-03 | Solid-state circuit breaker and power failure processing method thereof |
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| Country | Link |
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| CN (1) | CN114142441A (en) |
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2020
- 2020-09-03 CN CN202010916815.XA patent/CN114142441A/en active Pending
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