CN109901065A - A kind of Aftercurrent protection circuit breaker - Google Patents
A kind of Aftercurrent protection circuit breaker Download PDFInfo
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- CN109901065A CN109901065A CN201910276027.6A CN201910276027A CN109901065A CN 109901065 A CN109901065 A CN 109901065A CN 201910276027 A CN201910276027 A CN 201910276027A CN 109901065 A CN109901065 A CN 109901065A
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Abstract
本发明公布一种剩余电流保护断路器，包括壳体、触头系统、脱扣单元、电源模块、零序电流互感器和电子控制单元，所述电子控制单元分别与所述脱扣单元和所述电源模块相连，其特征在于，所述电子控制单元包括分合闸及实验检测单元和数据处理单元，所述分合闸及实验检测单元的一端与所述零序电流互感器的绕组连接，另一端与所述数据处理单元连接，在所述零序电流互感器与所述分合闸及实验检测单元之间还设有试验按钮。本发明在剩余电流保护断路器剩余电流保护功能关闭时，按下试验按钮后试验回路产生剩余电流，零序互感器输出信号，试验电路同时输出信号至电子控制单元，电子控制单元能够有效区分此时检测到剩余电流信号由试验电路产生。
The invention discloses a residual current protection circuit breaker, comprising a casing, a contact system, a trip unit, a power supply module, a zero-sequence current transformer and an electronic control unit, the electronic control unit is respectively connected with the trip unit and the The power module is connected to each other, and it is characterized in that the electronic control unit includes an opening and closing and experimental detection unit and a data processing unit, and one end of the opening and closing and experimental detection unit is connected to the winding of the zero-sequence current transformer, The other end is connected with the data processing unit, and a test button is also arranged between the zero-sequence current transformer and the opening and closing and experimental detection unit. When the residual current protection function of the residual current protection circuit breaker is turned off, the test circuit generates residual current after pressing the test button, the zero sequence transformer outputs the signal, and the test circuit simultaneously outputs the signal to the electronic control unit, and the electronic control unit can effectively distinguish the When the residual current signal is detected, it is generated by the test circuit.
Description
Technical field
The present invention relates to low voltage electrical apparatus technology fields, relate in particular to a kind of Aftercurrent protection circuit breaker.
Background technique
Aftercurrent protection circuit breaker is a kind of important low-voltage variation electric appliance, is mainly used to that residual current occurs in equipment
It is protected when failure and to the person electric shock for having fatal risk.The conventional residual current protecting with test function is disconnected
Road device, by connecting test loop after pressing local test button, test loop one end connects power grid, and the other end unidirectionally passes through zero
Joint test resistance after sequence mutual inductor, the test resistance other end connect power grid and constitute test current circuit.After test current generates
Zero sequence transformer output signal, control breaker open operation completes residue after residual current detection unit detects residual current signal
The verifying of current detection function, when breaker can normal separating brake, then show the normal but traditional tool of remaining protective current function
There is the residual current protecting function of the breaker of residual current protecting function once to close or damage, then it can not be to its residual current
Defencive function is detected, i.e., whether normal user can not judge current residual current protecting function, to bring in use
Great security risk.
And intelligent, informationization is the application trend of Aftercurrent protection circuit breaker, residual current protecting in smart grid
Breaker can be controlled by information, and external control centre can open or close residual current protecting function.It is controlled by information
Aftercurrent protection circuit breaker is after the closing of residual current protecting function, even if being detected using traditional detection method zero sequence transformer
To residual current signal, breaker can not carry out separating brake, be unable to complete the detection of residual current protecting function.Residual current is protected
After protective function is prohibited, the missing of detection function will be brought greatly to the use of residual current operated protective device breaker and its detection
Inconvenience, while also generating great security risk.
Summary of the invention
Based on the above background, the present invention provides, and can effectively solve the above problems,
Following technical proposal can be used to realize in above-mentioned purpose of the invention:
A kind of Aftercurrent protection circuit breaker, including shell, contact system, trip unit, power module, zero sequence current mutual inductor
And electronic control unit, the electronic control unit are connected with the trip unit and the power module respectively, the electronics
Control unit includes divide-shut brake and experiment detection unit and data processing module, one end of the divide-shut brake and experiment detection unit
It is connect with the winding of the zero sequence current mutual inductor, the other end is connect with the data processing unit, mutual in the zero-sequence current
Test button is additionally provided between sensor and the divide-shut brake and experiment detection unit.
Preferably, when the test button disconnects, the divide-shut brake and experiment detection unit export the first signal and pass
It is defeated by the data processing unit, when the test button is switched on, the divide-shut brake and experiment detection unit output second
Signal is simultaneously transferred to the data processing unit.
Preferably, the period of first signal is 10ms, and the period of the second signal is 20ms.
Preferably, the divide-shut brake and testing inspection unit include:
At least two dropping resistor R1, R3, one end of the dropping resistor R1 can be led with the pole L or the pole N for passing through zero sequence transformer
Line is connected, the other end and biphase rectification diode D1 series connection, one end of the dropping resistor R3 can with pass through zero sequence transformer
And be not connected with the pole N connecting the dropping resistor R1 or L polar conductor, the other end is connected with biphase rectification diode D2；
Biphase rectification diode D1, D2, one end of the rectifier diode D1 and dropping resistor R1 series connection, the rectification two
One end of pole pipe D2 and dropping resistor R3 series connection, and the rectifier diode D1 and the rectifier diode D2 other end point
It is not connected with the input terminal of the optocoupler U1；
Optocoupler U1, the input terminal of the optocoupler U1 are connected with the rectifier diode D1 and the rectifier diode D2 respectively, institute
The output end for stating optocoupler U1 is connected with the data processing unit.
Preferably, one end of the winding connects and is connected after the test button with one end of the rectifier diode D2,
The other end of the winding is connected with the other end of the rectifier diode D2.
Preferably, the diode D1 includes diode D1a and diode D1b, the diode D1a and diode D1b
For parallel connection, and it is contrary；The rectifier diode D2 includes diode D2a and diode D2b, the diode D2a and two
Pole pipe D2b is parallel connection, and contrary.
Preferably, the divide-shut brake and testing inspection unit further include dropping resistor R2 and R4, the both ends difference of the R2
Connect with the dropping resistor R1 and biphase rectification diode D1, the both ends of the R4 respectively with the dropping resistor R3 and two-way
Rectifier diode D2 series connection.
Preferably, the electronic control unit further includes communication module, the communication module respectively with the data processing
Unit is connected with external control centre.
Preferably, the communication module can be connected by wired or wireless mode with external control centre, described wired
Mode includes RS485, RS232, RS422, one of EtherNet, CAN, DeviceNet, Profibus, the wireless parties
Formula includes one of Wifi, Bluetooth, ZigBee, NFC, GRPS, NB-IoT, LoRa.
Preferably, the electronic control unit further includes residual current detection unit, the residual current detection unit point
It is not connected with the secondary output end of the zero sequence transformer and the data processing unit.
Preferably, the residual current detection unit includes differential amplifier circuit, and the differential amplifier circuit is by described zero
The Weak current signal of sequence mutual inductor output is converted into voltage signal, and is enlarged into the letter that the data processing unit can identify
Number.
Preferably, the input terminal of the trip unit is connected with the data processing unit, output end and tripping coil phase
Even.
Preferably, the trip unit includes controllable switch device, and the controllable switch device is silicon-controlled.
Preferably, the data processing unit includes programmable data processing chip, and the programmable data handles chip
It can be microcontroller or microprocessor.
Preferably, the power module includes full-wave rectifying circuit, switch power module and linear voltage dropping circuit, the electricity
The input terminal of source module connects network voltage, and the full-wave rectifying circuit carries out full-wave rectification to the network voltage, described to open
Powered-down source module and the linear voltage dropping circuit carry out decompression and pressure stabilizing to the network voltage after rectification.
Preferably, the input terminal of the power module is additionally provided with overvoltage crowbar, and the overvoltage crowbar includes pressure
Quick resistance and/or gas-discharge tube.
Beneficial effects of the present invention are as follows:
By the divide-shut brake and testing inspection unit of setting, closed in Aftercurrent protection circuit breaker residual current protecting function
When, test loop generates residual current, zero sequence transformer output signal, hookup while output signal after pressing test button
To electronic control unit, electronic control unit can be distinguished effectively detects that residual current signal is generated by hookup at this time；
The circuit can also detect the whether normal divide-shut brake of breaker simultaneously, and Aftercurrent protection circuit breaker can be connected by communication mode and be controlled
Center processed, control centre can accurately understand the various status informations of breaker, greatly improve Aftercurrent protection circuit breaker intelligence
Energyization is horizontal.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the residual current detection of one embodiment of the invention and the block diagram for protecting circuit.
Fig. 2 is the residual current generating process schematic diagram of one embodiment of the invention.
Fig. 3 is the residual current generating process schematic diagram of another embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, property embodiment as an example, a kind of Aftercurrent protection circuit breaker, comprising: shell, touching
Head system, trip unit 3, power module 4, zero sequence current mutual inductor 7 and electronic control unit, the contact system, tripping are single
Member 3, power module 4, zero sequence current mutual inductor 7 and electronic control unit are disposed in the housing, electronics described in trip unit 3
Control unit is connected with the trip unit 3 and the power module 4 respectively, and the electronic control unit includes divide-shut brake and examination
Test detection unit 1, residual current detection unit 2 and data processing unit 5 and communication module 6, the divide-shut brake and testing inspection
Unit 1 is except in addition to carrying out circuit-breaker switching on-off state-detection, it may also be used for carries out to the residual current protecting function of breaker
Verifying, including residual current occurs and test button Pen-down detection.The input terminal of the divide-shut brake and testing inspection unit 1 difference
It is connect with the L polar conductor and N polar conductor for bypassing zero sequence transformer 7, the output end and institute of the divide-shut brake and testing inspection unit 1
It states data processing unit 5 to be connected, the divide-shut brake and testing inspection unit 1 include: dropping resistor R1, R2, R3, R4, diode
D1, D2, optocoupler U1 and test button 8.Preferably, described diode D1, D2 are rectification double diode.As shown in Figure 1, described
One end of dropping resistor R1 is connected with the N polar conductor for passing through the zero sequence transformer 7, and the dropping resistor R1 and the decompression
Resistance R2, diode D1 series connection, the diode D1 are rectification double diode, and the diode D1 includes diode D1a and two
Pole pipe D1b, the diode D1a and diode D1b are parallel connection, and contrary；One end of the dropping resistor R3 with pass through
The L polar conductor of the zero sequence transformer 7 is connected, and the dropping resistor R3 connects with the dropping resistor R4, diode D2, institute
Stating diode D2 is rectifier diode, and the diode D2 includes diode D2a and diode D2b, the diode D2a and two
Pole pipe D2b is parallel connection, and contrary.Certainly, by one end of the dropping resistor R1 and the zero sequence transformer 7 can also be passed through
L polar conductor be connected, at this point, one end of the dropping resistor R3 is connected with across the N polar conductor of the zero sequence transformer 7.Institute
The input terminal for stating optocoupler U1 is connected with the diode D1 and the diode D2 respectively, and the output end of the optocoupler U1 and institute
Data processing unit 5 is stated to be connected.Winding 71, one end series connection institute of the winding 71 are also arranged in the zero sequence transformer 7
It is connected after stating test button 8 with one end of the rectifier diode D2, the other end and the rectifier diode of the winding 71
The other end of D2 is connected.Preferably, test button 8 is miniature circuit breakers, in order to enhance the residual current signal of test loop generation,
7 multi-turn of zero sequence transformer should be bypassed around the winding 71 of zero sequence transformer 7.The zero sequence transformer 7 is for incuding power grid
In residual current.
Please continue to refer to shown in Fig. 1, the input terminal of the residual current detection unit 2 is connect with the zero sequence transformer 7,
The output end of the residual current detection unit 2 is connect with the data processing unit 5.The residual current detection unit 2 wraps
Differential amplifier circuit is included, the residual current in load circuit that the differential amplifier circuit can incude the zero sequence transformer 7
Signal is converted to voltage signal, and is enlarged into the signal that data processing unit 5 can be identified, be calculated.
The trip unit 3 is tripping control unit, and the driving power of trip unit is connect with the power module 44, institute
The control signal input for stating trip unit 3 is connect with the data processing unit 5, the output end of the trip unit 3 and de-
The connection of fastening wire circle, after the data processing unit 5 issues control signal, the controllable switch device in the trip unit 3 is led
Logical, at this point, having larger current to flow through in the tripping coil, the striker in coil makes circuit breaker tripping.Preferably, it controllably opens
It is silicon-controlled for closing device.
The data processing unit 5 includes programmable data processing chip and its necessary peripheral circuit.Preferably, described
Programmable data processing chip is microcontroller or microprocessor, the programmable data processing chip can be realized AD conversion and
Clocking capability, by AD conversion function, programmable data processing chip can transmit the residual current detection unit 2
Analog signal is converted into manageable digital signal, and electricity can be identified by handling chip by programmable data described in clocking capability
Square-wave signal period in road, the programmable data processing chip have multiple inputs, output port, connect including communication
Mouthful, it can be communicated with communication module 6 by the communication interface.In conclusion the programmable data processing chip can
It realizes that residual current measures function, high and low level control magnetic silicon controlled switch circuit can be exported, low and high level is able to detect and is used for
It identifies circuit-breaker switching on-off state, and can be realized and extraneous communication function.
The power module 4 includes full-wave rectifying circuit, switch power module and linear voltage dropping circuit, the power module
4 input terminal connects network voltage, and the full-wave rectifying circuit carries out full-wave rectification, the network voltage to the network voltage
Be depressured after full-wave rectification by the switch power module, voltage regulator circuit to after the network voltage pressure stabilizing after decompression by
Linear voltage-stabilizing circuit is depressured again and pressure stabilizing finally obtains system working power.The input terminal of the power module 4 was additionally provided with
Voltage protection circuit, the overvoltage crowbar include varistor and/or gas-discharge tube.
The residual current detection and protection circuit further include communication module 6, one end of the communication module 6 and the number
It is connected according to processing unit 5, the other end is connect by wired or wireless communication mode with external control centre, the communication module
6 can receive the information from the data processing unit 5, and the information received is transferred to the external control centre, institute
The various states of breaker can be checked according to the data that the communication module 6 transmits by stating external control centre, comprising: open circuit
The operation information of power grid and the status information of breaker where device, the operation information include residual current real value and failure letter
Breath, the status information of the short-circuiting device include separating brake, "on" position, whether open the information such as residual current protecting function, can be right
Residual current protection action value, operating time of protection etc. carry out remote setting operation etc., and transmittable residual current protecting function
Order can be opened or closed, the communication module 6 can receive the instruction from the external control centre, and described instruction is passed
It is defeated by the data processing unit 5, the data processing unit 5 controls the trip circuit and threads off.Preferably, described logical
News module 6 is communicated with external control centre using Blue-tooth communication method.Certainly, in addition to Bluetooth communication, can also pass through
RS485, RS232, RS422, EtherNet, Wifi, ZigBee, NFC, GRPS, NB-IoT, LoRa, CAN, DeviceNet,
One of Profibus is communicated.
Hereinafter, will illustrate in conjunction with Fig. 1 and aforementioned embodiments, one described according to disclosure embodiment is further illustrated
The specific work process of kind residual current detection unit.
It please refers to shown in Fig. 1, the input terminal of the divide-shut brake and testing inspection unit 1 is by passing through the zero sequence transformer
7 pole L is connect with N polar conductor with power grid, and the frequency of the sinusoidal voltage of power grid input is 50hz, corresponding sine wave period
It is dropped after breaker closing by the sinusoidal voltage that dropping resistor R1, R2, R3, R4 input power grid for 20ms
Pressure rectifies the sine wave of input by the full-wave rectifying circuit that the diode D1 and diode D2 is formed after decompression,
Rectified sinusoidal wave becomes the half-wave signa that the period is 10ms, and optocoupler U1 will export the square-wave signal that the period is 10ms, the signal
It is input to the data processing unit 5, data processing unit 5 will be according to whether have square-wave signal to judge that breaker is in and close a floodgate
Or gate-dividing state shows that the breaker is currently "on" position if there is square-wave signal, if showing without square-wave signal
The breaker is currently gate-dividing state.
After the test button 8 is pressed, a bridge arm of diode D2 will be short-circuited in full-wave rectifying circuit.Specifically
, as shown in Fig. 2, arrow direction as shown in the figure is sense of current in circuit, dropping resistor R1, R2 input terminal voltage is
Timing, electric current is after dropping resistor R1 and dropping resistor R2, by the diode D1a of forward conduction in diode D1, via
Light emitting diode in optocoupler U1 returns to cathode using dropping resistor R3, R4 by winding 71 and test button 8；Because of two poles
Resistance at pipe D2 is larger, therefore electric current finds resistance lesser route flowing during circulation, therefore, when electric current passes through light
After coupling U1, the biggish diode D2 of resistance will be avoided, and the lesser test button 8 of steering resistance and winding 71.At this point, because of electric current
It flows only through diode D1 and does not flow through diode D2, therefore only have the electric current of half period to flow through after test button 8 is pressed
The Light-Emitting Diode of optocoupler U1, the square wave for being 20ms in the output end output period of optocoupler U1.
Similarly, as shown in figure 3, resistance R3, R4 input terminal voltage is timing, after the test button 8 is pressed, electric current
By winding 71 and test button 8, by the diode D1b of D1 reverse-conducting, cathode is returned to using dropping resistor R1, R2.
By foregoing description, the Light-Emitting Diode for only having the electric current of half period to flow through optocoupler U1 after test button 8 is pressed, in light
The square wave that the output end output period of coupling U1 is 20ms.It is mutual to pass through the zero sequence for the either voltage of positive half cycle or negative half period
There is electric current to flow through in 7 conducting wire of sensor, sinusoidal signal can be generated in divide-shut brake and testing inspection circuit 1, as residual current
Stimulus.
In conclusion optocoupler U1 output end exports the square-wave signal that the period is 10ms when test button 8 is not pressed；Examination
It tests after button 8 is pressed, optocoupler U1 output end exports the square-wave signal that the period is 20ms, while the zero sequence transformer 7 will be to
Residual current detection unit 2 exports residual current signal, after residual current detection unit 2 amplifies the signal at output to data
Unit 5 is managed, the data processing unit 5 detects that residual current signal is detected simultaneously by divide-shut brake and testing inspection unit 1 is sent out
Determine that the residual current signal is generated by hookup after 20ms square wave out, data processing unit 5 sends de- to trip unit 3
Button instruction, the driving of trip unit 3 executes coil and makes circuit breaker tripping, to complete the verifying of residual current protecting function.
Residual current detection of the invention and protection circuit are two-way by the way that two are arranged in divide-shut brake and detection circuit
Rectifier diode generates different square-wave signals when breaker is in different states, and square-wave signal is transmitted by optocoupler
To data processing unit, so as to accurately understand the various status informations of breaker.
The foregoing is merely a prefered embodiment of the invention, and those skilled in the art can be with according to application documents disclosure
Various changes or modifications are carried out without departing from the spirit and scope of the present invention to the embodiment of the present invention.
Claims (9)
1. a kind of Aftercurrent protection circuit breaker, including shell, contact system, trip unit (3), power module (4), zero sequence electricity
Current transformer (7) and electronic control unit, it is characterised in that:
The electronic control unit includes opening and closing state and testing inspection unit (1) and data processing unit (5), and described point
"on" position and testing inspection unit (1) are connect with the winding (71) of the zero sequence current mutual inductor (7), the opening and closing state
And testing inspection unit (1) receive breaker the pole load end L and the pole N input signal, and to the input signal processing after
The data processing unit (5) are outputed signal to, it is single in the zero sequence current mutual inductor (7) and the divide-shut brake and experiment detection
Test button (8) are equipped between first (1).
2. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that when the test button (8)
When disconnection, the opening and closing state and experiment detection unit (1) exports first frequency signal to the data processing unit (5),
When the test button (8) is switched on, the opening and closing state and experiment detection unit (1) export second frequency signal to institute
State data processing unit (5).
3. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that the opening and closing state and examination
Testing detection unit (1) includes dropping resistor, rectifier diode and output optocoupler, the dropping resistor and the rectifier diode
Connection, the rectifier diode are connect with the optocoupler.
4. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that the electronic control unit is also
Including communication unit (6), the communication unit (6) is connected with the data processing unit (5), and the communication unit (6) with
It is wired or wirelessly externally communicated.
5. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that the electronic control unit is also
Including residual current detection unit (2), the residual current detection unit (2) is secondary with the zero sequence transformer (7) respectively
Output end is connected with the data processing unit (5).
6. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that the trip unit (3)
Input terminal is connected with the data processing unit (5), and output end is connected with tripping coil.
7. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that the data processing unit
It (5) include programmable data processing chip, the programmable data processing chip can be microcontroller or microprocessor.
8. a kind of Aftercurrent protection circuit breaker according to claim 1, which is characterized in that power module (4) packet
Include full-wave rectifying circuit, switch power module and linear voltage dropping circuit, the input terminal connection power grid electricity of the power module (4)
Pressure, the full-wave rectifying circuit carry out full-wave rectification, the switch power module and the linear voltage decreasing to the network voltage
Circuit carries out decompression and pressure stabilizing to the network voltage after rectification.
9. a kind of Aftercurrent protection circuit breaker according to claim 8, which is characterized in that the power module (4)
Input terminal is additionally provided with overvoltage crowbar, and the overvoltage crowbar includes varistor and/or gas-discharge tube.
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| CN201910276027.6A CN109901065A (en) | 2019-04-08 | 2019-04-08 | A kind of Aftercurrent protection circuit breaker |
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| CN110456262A (en) * | 2019-08-02 | 2019-11-15 | 上海电器科学研究所（集团）有限公司 | Detection device and test method for automatic closing circuit breaker with residual current protection function |
| CN112098826A (en) * | 2020-09-02 | 2020-12-18 | 威胜电气有限公司 | System, equipment and method for batch detection of quality of residual current circuit breakers |
| CN112531642A (en) * | 2020-12-02 | 2021-03-19 | 真兰电气(上海)有限公司 | Residual current protection circuit and residual current protection device |
| CN112731007A (en) * | 2020-12-11 | 2021-04-30 | 深圳供电局有限公司 | Residual current protection device test system |
| CN113904300A (en) * | 2021-09-16 | 2022-01-07 | 广东佛电电器有限公司 | Residual current protector with self-checking function |
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| CN110456262A (en) * | 2019-08-02 | 2019-11-15 | 上海电器科学研究所（集团）有限公司 | Detection device and test method for automatic closing circuit breaker with residual current protection function |
| CN112098826A (en) * | 2020-09-02 | 2020-12-18 | 威胜电气有限公司 | System, equipment and method for batch detection of quality of residual current circuit breakers |
| CN112531642A (en) * | 2020-12-02 | 2021-03-19 | 真兰电气(上海)有限公司 | Residual current protection circuit and residual current protection device |
| CN112531642B (en) * | 2020-12-02 | 2023-04-07 | 真兰电气(上海)有限公司 | Residual current protection circuit and residual current protection device |
| CN112731007A (en) * | 2020-12-11 | 2021-04-30 | 深圳供电局有限公司 | Residual current protection device test system |
| CN112731007B (en) * | 2020-12-11 | 2023-09-15 | 深圳供电局有限公司 | Residual current protection device test system |
| CN113904300A (en) * | 2021-09-16 | 2022-01-07 | 广东佛电电器有限公司 | Residual current protector with self-checking function |
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Application publication date: 20190618 |