CN111211613A - Intelligent low-voltage controller, low-voltage switch control system and device - Google Patents

Intelligent low-voltage controller, low-voltage switch control system and device Download PDF

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Publication number
CN111211613A
CN111211613A CN202010155991.6A CN202010155991A CN111211613A CN 111211613 A CN111211613 A CN 111211613A CN 202010155991 A CN202010155991 A CN 202010155991A CN 111211613 A CN111211613 A CN 111211613A
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China
Prior art keywords
power supply
current
low
voltage
sampling
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CN202010155991.6A
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Chinese (zh)
Inventor
李君�
许健
李先怀
范律
邓术
李智敏
陈观强
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Willfar Information Technology Co Ltd
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Willfar Information Technology Co Ltd
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Priority to CN202010155991.6A priority Critical patent/CN111211613A/en
Publication of CN111211613A publication Critical patent/CN111211613A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/248—UPS systems or standby or emergency generators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to an intelligent low-voltage controller, a low-voltage switch control system and a low-voltage switch control device. An intelligent low-voltage controller comprises a processor, a current sampling module, a communication module and a power supply module; the current sampling module, the communication module and the power supply module are respectively connected with the processor; the current sampling module comprises a current sampling device and a sampling conversion device; compared with the prior art, the method has the following effects: 1. the secondary part of the switch adopts a modular design, supports hot plugging and is convenient to maintain; 2. by adopting the CT bootstrap switching circuit with the automatic switching function, the load resistance of the sampling circuit is constant within the normal load range of the line current, and the sampling precision is effectively improved; 3. an auxiliary power supply is integrated in the switch, a super capacitor is used as a backup power supply, and power failure events and fault information are reported and uploaded after the switch is powered off.

Description

Intelligent low-voltage controller, low-voltage switch control system and device
Technical Field
The invention relates to the field of electric appliances, in particular to an intelligent low-voltage controller, a low-voltage switch control system and a low-voltage switch control device.
Background
The intelligent low-voltage switch is a key device applied to a low-voltage distribution network and plays a role in low-voltage distribution network protection and energy distribution. In the existing low-voltage switch equipment, due to the fact that the current and voltage measurement accuracy is low, a power supply module does not support reporting of power failure events, a modularized remote communication module is not available, a switch control part circuit is inconvenient to replace and upgrade, and the like, the problems that the application requirements of the ubiquitous power internet of things in depth cannot be met, such as fault study and judgment, reporting of power failure events, electric energy metering, topology analysis and other advanced functions.
Patent document ZL201610106157.1 discloses a domestic intelligent earth-leakage protector, including the earth-leakage protector body, the driving lever is installed on the surperficial upper portion of earth-leakage protector body, driving lever and the electric telescopic handle fixed connection of setting in the inboard of earth-leakage protector body, display and operating panel are still installed to the positive surface of earth-leakage protector body, the battery is installed to the inboard bottom of earth-leakage protector body, temperature sensor and humidity transducer are still installed to the inside of earth-leakage protector body, display, operating panel, electric telescopic handle, battery, vary voltage unit, thermorelay, fuse, temperature sensor and humidity transducer all are connected with the intelligent control device electricity of installing at the inboard of earth-leakage protector body. This domestic intelligent earth-leakage protector can derive fault information, and convenience of customers looks over and the analysis improves the maintenance efficiency of family's circuit, has satisfied the work demand of intelligent household equipment day by day, has reduced the power consumption hidden danger.
However, the prior art still has the following disadvantages: 1. the CT power taking and measurement adopt the same current transformer, the measurement precision is low, and the metering function is difficult to realize; 2. an integrated auxiliary power supply and a backup power supply are not arranged in the switch, and after the switch is powered off, a power failure event cannot be reported, and fault information cannot be uploaded to a master station; 3. the circuit fault research and judgment is influenced because of no circuit topology auxiliary analysis function; 4. the secondary control portion of the switch is not replaceable, making the switch application inflexible.
Therefore, the existing low-voltage control equipment has the defects and needs to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an intelligent low-voltage controller, a low-voltage switch control system and a device, which can meet the requirement of the internet of things, can provide a one-minute communication power supply after a power failure occurs in a transformer area, can report failure or power failure information, and improve the efficiency of emergency repair of the transformer area.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent low-voltage controller comprises a processor, a current sampling module, a communication module and a power supply module; the current sampling module, the communication module and the power supply module are respectively connected with the processor;
the current sampling module comprises a current sampling device and a sampling conversion device; the current sampling device is connected with the sampling conversion device, and the sampling conversion device is connected with the processor;
the power supply module comprises a main power supply, an auxiliary power supply and a backup power supply; the main power supply supplies power to the processor by taking power through the current sampling device; the auxiliary power supply is used for assisting the main power supply to supply power to the processor; the backup power supply is used for supplying power to the processor when the main power supply and the auxiliary power supply stop supplying power.
Preferably, the intelligent low-voltage controller, the current sampling device comprises a plurality of groups of current samplers; the current sampler includes: a filter capacitor and a sampling resistor; the filter capacitor is connected with the sampling resistor in parallel; and two ends of the sampling resistor are respectively connected with the sampling conversion device. Further, in normal use, the current samplers in the current sampling device are preferably 4 groups.
Preferably, the intelligent low-voltage controller comprises: the circuit comprises a comparator, a first rectifier, a switching tube, an energy storage capacitor and a first isolator; the input end of the comparator is connected with one of the current samplers, and the output end of the comparator is connected with the base electrode of the switching tube; the first rectifier is connected with the current sampler connected with the comparator; a collector of the switching tube is connected with the first rectifier, and an emitter of the switching tube is connected with the first isolator; one end of the energy storage capacitor is connected with the first rectifier, and the other end of the energy storage capacitor is connected with the first isolator; the first isolator is connected with the processor.
Preferably, the intelligent low-voltage controller, the auxiliary power supply includes: the step-down transformer, the second rectifier and the second isolator; both output ends of the step-down transformer are connected with the second rectifier; the second rectifier is connected with the second isolator; the second isolator is connected with the processor.
Preferably, the backup power source is a super capacitor, one end of the super capacitor is connected with the second rectifier, and the other end of the super capacitor is connected with the second isolator.
Preferably, the communication module of the intelligent low-voltage controller comprises a carrier communicator, a wireless communicator, a bluetooth communicator and an RS485 communicator.
Preferably, the switching tube is a triode, and is a conventional use of the switching function of the triode.
Preferably, the first rectifier and the second rectifier are both rectifier diodes.
Preferably, the first isolator and the second isolator are both isolation diodes.
A low-voltage switch control system comprises the intelligent low-voltage controller and a circuit breaker; the circuit breaker comprises a switch contact, an upper port potential taking device and a lower port current mutual inductance device; the upper port current sampling potential and the lower port current mutual inductance device are respectively positioned at the upper port position and the lower port position of the switch contact;
the lower port current mutual inductance device is connected with the current sampling device; the upper port voltage taking potential is connected with the auxiliary power supply.
Preferably, in the low-voltage switch control system, the lower current mutual inductance device includes a plurality of sets of current transformers; and the current transformers are respectively connected with the current samplers in the current sampling device. Preferably, in the current transformer apparatus, the number of the current transformers is 4.
Preferably, the low-voltage switch control system further includes a plurality of voltage transformers and a tripping device; the tripping device is used for driving and detecting the on-off of the line switch and is connected with the processor in the intelligent low-voltage controller; and the voltage transformers are all connected with a sampling conversion device in the intelligent low-voltage controller.
A low-voltage switch control device comprises a body and the low-voltage switch control system; the circuit breaker in the low-voltage switch control system and the external interface of the intelligent low-voltage controller are standard plug interfaces, so that the plugging and unplugging are convenient.
Compared with the prior art, the intelligent low-voltage controller, the low-voltage switch control system and the device provided by the invention have the following effects:
1. the secondary part of the switch adopts a modular design, supports hot plugging and is convenient to maintain;
2. by adopting the CT bootstrap switching circuit with the automatic switching function, the load resistance of the sampling circuit is constant within the normal load range of the line current, and the sampling precision is effectively improved;
3. an auxiliary power supply is integrated in the switch, a super capacitor is used as a backup power supply, and power failure events and fault information are reported and uploaded after the switch is powered off.
Drawings
Fig. 1 is a block diagram of an intelligent low-voltage controller provided by the present invention;
FIG. 2 is a schematic diagram of a low voltage switching system provided by the present invention;
fig. 3 is a circuit diagram of a low-voltage switching system in embodiment 2 provided by the present invention;
fig. 4 is a structural diagram of a low-voltage switch control device according to embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1 to 3 together, the present invention provides an intelligent low voltage controller, which includes a processor 1, a current sampling module 2, a communication module 3 and a power module 4; the current sampling module 2, the communication module 3 and the power supply module 4 are respectively connected with the processor 1; the processor 1 is a processor 1 commonly used in the art, and includes but is not limited to a microprocessor D8 and a central processing unit, and the present invention is not particularly limited;
the current sampling module 2 comprises a current sampling device 21 and a sampling conversion device 22; the current sampling device 21 is connected with the sampling conversion device 22, and the sampling conversion device 22 is connected with the processor 1; the sampling conversion device 22 is preferably an analog-to-digital converter D7, and the selection of the analog-to-digital converter is not specifically limited in the present invention and is a common device in the field;
the power module 4 comprises a main power supply 41, an auxiliary power supply 42 and a backup power supply 43; the main power supply 41 supplies power to the processor 1 by taking power through the current sampling device 21; the auxiliary power supply 42 is used for assisting the main power supply 41 to supply power to the processor 1; the backup power supply 43 is configured to supply power to the processor 1 when the main power supply 41 and the auxiliary power supply 42 stop supplying power.
Preferably, in this embodiment, the current sampling device 21 includes a plurality of sets of current samplers (not shown); the current sampler includes: a filter capacitor C1 and a sampling resistor R1; the filter capacitor C1 is connected with the sampling resistor R1 in parallel; both ends of the sampling resistor R1 are connected to the sampling conversion device 22.
As shown in fig. 3, the controller auxiliary power supply 42 is composed of a step-down transformer L1, a second rectifier D4, a super capacitor C2, and a second isolator D5, and the auxiliary power supply 42 is powered from the switch. The input end of the step-down transformer L1 is connected with the C-phase voltage and the N line of the upper port of the switch, the output end of the step-down transformer L1 is connected with the input end of the second rectifier D4, the output end of the second rectifier D4 is connected with the super capacitor C2, and the super capacitor C2 is connected with the second isolator D5. The auxiliary power supply 42 powers the processor D8 through a diode D5.
Preferably, in this embodiment, the main power supply 41 includes: the circuit comprises a comparator D1, a first rectifier D2, a switching tube D3, an energy storage capacitor C3 and a first isolator D6; the input end of the comparator D1 is connected with one of the current samplers, and the output end of the comparator D1 is connected with the base electrode of the switch tube D3; the first rectifier D2 is connected with the current sampler to which the comparator D1 is connected; the collector of the switch tube D3 is connected with the first rectifier D2, and the emitter is connected with the anode of the first isolator D6; one end of the energy storage capacitor C3 is connected with the first rectifier D2, and the other end is connected with the anode of the first isolator D6; the negative electrode of the first separator D6 is connected to the processor 1. The first rectifier D2 is a bridge rectifier circuit type, is generally used in the field, and is not particularly limited; the first isolator D6 is an isolation diode.
The current transformer bootstrap switching circuit of the intelligent low-voltage switch controller consists of a current transformer CT, a sampling resistor R1, a comparator D1, a first rectifier D2, a switch tube D3, an energy storage capacitor C3 and a first isolator D6. The output end of the secondary winding of the current transformer CT is connected with the filter capacitor C1 and the sampling resistor R1, the current signal is converted into a voltage signal after passing through the sampling resistor R1, and the voltage signal is connected to the P1 and P2 ports of the analog-to-digital converter D7 to complete analog-to-digital conversion. The voltage signal is simultaneously connected to the comparator D1 and the first rectifier D2, the output loop of the first rectifier D2 is controlled by the switch tube D3, and the output end of the switch tube D3 is connected to the energy storage capacitor C3 and the first isolator D6. When a short-circuit fault occurs in a low-voltage distribution network, a large impact current (generally more than 600A) is generated in the CT loop, the comparator D1 acts to open the switch tube D3, the impact current generated in the CT loop is discharged and stored through the energy storage capacitor C3, energy is stored for the switch trip, and power is supplied to the processor D8. The first/second isolators D6/D5 automatically switch the auxiliary power supply 42 and the main power supply 41 to provide power to the processor D8 and the trip mechanism.
Please refer to fig. 3, in the embodiment, the current transformer is shared by the measurement, protection and power taking, in order to reduce the influence of the power taking of the current transformer on the measurement, the comparison switching circuit is designed, the current value 600A is used as a reference, when the current transformer detects that the current in the line is below 600A, the current transformer self-power-taking circuit does not work, the load of the current transformer is constant, and the measurement accuracy can be improved. When short-circuit fault occurs, the comparison switching circuit is automatically switched into a current transformer power-taking loop to provide power for tripping of the circuit breaker.
When the line current is less than 600A, the current transformer is connected to the sampling loop and is not connected to the bootstrap circuit of the main power supply 41, the load of the current transformer is constant, the measurement precision is high, and the current transformer can be used for measurement and measurement functions, so that the functions of fault recording and topology auxiliary analysis are realized.
The voltage signal is simultaneously connected to the comparator D1 and the first rectifier D2, the output loop of the first rectifier D2 is controlled by the switch tube D3, and the output end of the switch tube D3 is connected to the energy storage capacitor C3 and the first isolator D6. When a short-circuit fault occurs in a low-voltage distribution network, a current transformer loop generates large impact current (generally more than 600A), a comparator D1 acts to open a switch tube D3, the impact current generated by a CT loop is discharged and stored through an energy storage capacitor C3, energy is stored for switch tripping, and power is supplied to a processor D8. The first/second isolators D6/D5 automatically switch the auxiliary power supply 42 and the main power supply 41 to provide power to the disposer 1 and the trip mechanism.
Preferably, in this embodiment, the auxiliary power supply 42 includes: a step-down transformer L1, a second rectifier D4, and a second isolator D5; both output terminals of the step-down transformer L1 are connected to the second rectifier D4; the second rectifier D4 is connected with the anode of the second isolator D5; the negative electrode of the second separator D5 is connected to the processor 1. The second rectifier D4 and the first rectifier D2 are the same rectifiers, are both rectifier diodes, and are used conventionally, and the rectifier diodes in fig. 3 are bridge rectifier diodes, but in actual application of the technical solution provided by the present invention, not only the bridge rectifier diodes are used, but also other rectifier devices may be used; the second isolator D5 is the same isolator as the first isolator D6, both are isolation diodes, and are used conventionally.
Preferably, in this embodiment, the backup power supply 43 is a super capacitor C2, one end of the super capacitor C2 is connected to the second rectifier D4, and the other end is connected to the positive electrode of the second isolator D5.
Specifically, the power module 4 is composed of three-stage power sources, namely, the main power source 41, the auxiliary power source 42, and the backup power source 43.
The intelligent controller provided by the invention is matched with a circuit breaker for use, the auxiliary power supply 42 is a power supply at the upper port of the circuit breaker, when the circuit breaker is in 3P connection, the power is supplied by AB line voltage, when the circuit breaker is in 4P connection, the power is supplied by CN phase voltage, and a carrier module also adopts single-phase carrier. After the circuit breaker is tripped by protection, the auxiliary power supply 42 takes power from the upper opening of the switch and can provide power for the circuit breaker. The backup power supply 43 is a super capacitor C2, the capacitance of which is selected to provide 1 minute of power to the communication system after a power failure in the auxiliary power supply 42, and to provide a circuit breaker trip power supply.
The defect of adopting the super capacitor C2 as a breaker to trip is that the super capacitor C2 needs to be charged when the system is electrified for the first time, the estimated full charge amount needs 5 minutes, the charging time is influenced by the requirements of power supply and power consumption, and the problem influences the power test of a power distribution room and meets the protection requirement of a fault, so that the system cannot trip in time.
The above problems can be solved by matching the main power supply 41 and the auxiliary power supply 42, when short circuit occurs, large current impact is generated, the CT loop accesses the measurement loop into the CT bootstrap power supply through the comparison switching circuit, and the electric quantity of the large current is stored in the super capacitor C2 to provide energy for tripping the circuit breaker.
As a preferable scheme, in this embodiment, the communication module 3 includes a carrier communicator, a wireless communicator, a bluetooth communicator, and an RS485 communicator.
Example 2
Referring to fig. 1 to fig. 3, the present invention further provides a low voltage switch control system, which includes the intelligent low voltage controller 20 and the circuit breaker 30 provided in embodiment 1; the circuit breaker 30 comprises a switch contact, an upper port potential taking device and a lower port current mutual inductance device; the upper port current sampling potential and the lower port current mutual inductance device are respectively positioned at the upper port position and the lower port position of the switch contact;
the lower port current mutual inductance device is connected with the current sampling device 21; the upper port voltage is connected to the auxiliary power supply 42.
Preferably, in this embodiment, the lower current transformer includes a plurality of sets of current transformers; the current transformers are respectively connected with the current samplers in the current sampling device 21. Preferably, the current transformers are 4 groups, three current transformers (CTA, CTB and CTC in figure 2) are integrated in the circuit breaker body to measure the line current of three-phase power respectively, and one residual current transformer (CTS in figure 2) is selected and matched, so that the circuit breaker is suitable for current and can realize the functions of power taking and measurement simultaneously. The precision of the current transformer is 0.01 level.
As a preferred scheme, in this embodiment, the circuit breaker further includes a plurality of voltage transformers and a tripping device; the tripping device is used for driving and detecting the on-off of a line switch and is connected with the processor 1 in the intelligent low-voltage controller; and a plurality of voltage transformers are connected with a sampling conversion device 22 in the intelligent low-voltage controller. When the circuit breaker is connected into a four-wire three-phase power grid, a plurality of voltage signals detected by the voltage transformers are UA, UB and UC respectively.
The voltage signals UA, UB, UC are connected to the ports P3, P4, P5 of the analog-to-digital converter D7, analog-to-digital conversion is completed, the voltage and current signals are subjected to analog-to-digital conversion, and then are connected to the processor D8, and the processor D8 performs corresponding calculation according to the sampled voltage and current data, so as to implement short-circuit protection.
Example 3
Referring to fig. 4, the present invention further provides a low-voltage switch control device, which includes a body 10 and the low-voltage switch control system provided in embodiment 2; the circuit breaker in the low-voltage switch control system and the external interface of the intelligent low-voltage controller are standard plug interfaces, so that the plugging and unplugging are convenient. The intelligent low-voltage switch controller adopts a modular design, adopts a standardized hardware interface and structure, and realizes a hot-plugging function. The controller can be flexibly integrated into a low-voltage molded case circuit breaker and a residual current protection circuit breaker to form an intelligent switch product.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (10)

1. An intelligent low-voltage controller is characterized by comprising a processor, a current sampling module, a communication module and a power supply module; the current sampling module, the communication module and the power supply module are respectively connected with the processor;
the current sampling module comprises a current sampling device and a sampling conversion device; the current sampling device is connected with the sampling conversion device, and the sampling conversion device is connected with the processor;
the power supply module comprises a main power supply, an auxiliary power supply and a backup power supply; the main power supply supplies power to the processor by taking power through the current sampling device; the auxiliary power supply is used for assisting the main power supply to supply power to the processor; the backup power supply is used for supplying power to the processor when the main power supply and the auxiliary power supply stop supplying power.
2. The intelligent low voltage controller according to claim 1, wherein the current sampling device comprises a plurality of sets of current samplers; the current sampler includes: a filter capacitor and a sampling resistor; the filter capacitor is connected with the sampling resistor in parallel; and two ends of the sampling resistor are respectively connected with the sampling conversion device.
3. The intelligent low voltage controller of claim 2, wherein the main power supply comprises: the circuit comprises a comparator, a first rectifier, a switching tube, an energy storage capacitor and a first isolator; the input end of the comparator is connected with one of the current samplers, and the output end of the comparator is connected with the base electrode of the switching tube; the first rectifier is connected with the current sampler connected with the comparator; a collector of the switching tube is connected with the first rectifier, and an emitter of the switching tube is connected with the first isolator; one end of the energy storage capacitor is connected with the first rectifier, and the other end of the energy storage capacitor is connected with the anode of the first isolator; the first isolator is connected with the processor.
4. The intelligent low voltage controller of claim 1, wherein the auxiliary power supply comprises: the step-down transformer, the second rectifier and the second isolator; both output ends of the step-down transformer are connected with the second rectifier; the second rectifier is connected with the second isolator; the second isolator is connected with the processor.
5. The intelligent low voltage controller according to claim 4, wherein the backup power source is a super capacitor, one end of the super capacitor is connected with the second rectifier, and the other end of the super capacitor is connected with the second isolator.
6. The intelligent low voltage controller of claim 1, wherein the communication module comprises a carrier communicator, a wireless communicator, a Bluetooth communicator, and an RS485 communicator.
7. A low-voltage switch control system, characterized in that it comprises an intelligent low-voltage controller according to any one of claims 1 to 6 and a circuit breaker; the circuit breaker comprises a switch contact, an upper port potential taking device and a lower port current mutual inductance device; the upper port current sampling potential and the lower port current mutual inductance device are respectively positioned at the upper port position and the lower port position of the switch contact;
the lower port current mutual inductance device is connected with the current sampling device; the upper port voltage taking potential is connected with the auxiliary power supply.
8. The low-voltage switch control system according to claim 7, wherein the lower port current mutual inductance device comprises a plurality of sets of current transformers; and the current transformers are respectively connected with the current samplers in the current sampling device.
9. The low voltage switch control system of claim 7, wherein said circuit breaker further comprises a plurality of voltage transformers and trip devices; the tripping device is used for driving and detecting the on-off of the line switch and is connected with the processor in the intelligent low-voltage controller; and the voltage transformers are all connected with a sampling conversion device in the intelligent low-voltage controller.
10. A low-voltage switch control device, characterized by comprising a body, a low-voltage switch control system according to any one of claims 7 to 9; and the circuit breaker and the intelligent low-voltage controller external interface in the low-voltage switch control system are standard socket interfaces.
CN202010155991.6A 2020-03-09 2020-03-09 Intelligent low-voltage controller, low-voltage switch control system and device Pending CN111211613A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117405967A (en) * 2023-11-27 2024-01-16 江苏斯菲尔电气股份有限公司 Integrated three-phase current monitoring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117405967A (en) * 2023-11-27 2024-01-16 江苏斯菲尔电气股份有限公司 Integrated three-phase current monitoring system

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