CN109088478B - Remote terminal equipment of distribution transformer - Google Patents
Remote terminal equipment of distribution transformer Download PDFInfo
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- CN109088478B CN109088478B CN201811213351.5A CN201811213351A CN109088478B CN 109088478 B CN109088478 B CN 109088478B CN 201811213351 A CN201811213351 A CN 201811213351A CN 109088478 B CN109088478 B CN 109088478B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 95
- 238000012545 processing Methods 0.000 claims abstract description 66
- 229910052744 lithium Inorganic materials 0.000 claims description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 32
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 18
- 238000013480 data collection Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
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- H02J13/0075—
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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
- H02J9/061—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 for DC powered loads
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- 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
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- 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
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- 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
-
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The embodiment of the invention relates to the technical field of power systems, in particular to a remote terminal device of a distribution transformer, which can realize conversion of different voltage levels through a power supply unit so as to be used by corresponding chips and circuits, improves the anti-interference performance of the remote terminal device of the distribution transformer, and can ensure normal operation of a first processing unit and a second processing unit under the condition of power failure.
Description
Technical Field
The embodiment of the invention relates to the technical field of power systems, in particular to remote terminal equipment of a distribution transformer.
Background
In recent years, national economy of China rapidly develops, the physical culture living standard of people is continuously improved, and meanwhile, the demand of people for electric power is also increasingly greater, so that electric power industry is rapidly developed, and a power grid is continuously expanded. The network for supplying power to users directly or after voltage reduction at the low-voltage side of a secondary voltage reduction substation in a power system is generally called a power distribution network, and is formed by directly connecting overhead lines or cable distribution lines, distribution centers or pole-mounted voltage reduction transformers to users. Because of the increasing demands of users on the quality and reliability of power supply, the power supply departments are required to provide safe, economical, reliable and high-quality power, and the traditional technology and management means cannot adapt to new situations, and the distribution automation is an integrated system for remotely and real-time monitoring, coordination and control of devices on the distribution network. The monitoring, protection, control, metering and working management of power distribution network under normal and accident conditions are organically integrated together, the power supply quality is improved, a more responsible relation is established with users, the diversity of user requirements is met with reasonable price, the best power supply economy is striven for, and the enterprise management is more effective.
The distribution automation system comprises a distribution network data acquisition and monitoring part, a distribution geographic information system and a demand party management part. The incoming line monitoring mainly completes monitoring of the switch position, bus voltage, line current, active power and reactive power and electric quantity of the incoming line substation of the distribution network; the feeder automation monitors the states of the feeder sectionalizing switch and the interconnecting switch and the conditions of feeder current and voltage in a remote and real-time manner, realizes remote control of the line switch, acquires and records fault information, and automatically judges and isolates fault sections and restores power supply of non-fault areas; the switching station and the distribution substation automatically complete remote monitoring of active power, reactive power and electric measurement of line current, remote control of a switch, remote voltage regulation of a transformer and the like on the switching positions of a 10kV switching station and a community transformer, protect action signals and small-current grounding line selection conditions; the distribution transformer monitoring system is mainly used for monitoring the voltage and current of a distribution transformer, the active power of a secondary side, the loss of the transformer and the like, and meanwhile, compensation capacitors can be switched according to the voltage and reactive power conditions of a distribution network.
Distribution automation is a necessary trend of modernization of an electric power system, and has the main significance that: under the normal operation condition, the operation mode of the distribution network is optimized by monitoring the operation condition of the distribution network; when the distribution network is faulty or abnormal, the fault area is quickly detected and isolated, and the power supply of the non-fault area is timely recovered, so that the power failure time of a user is shortened, and the power failure area is reduced; the power load is reasonably controlled, and the utilization rate of the power equipment is improved; the reactive load and the voltage level are reasonably controlled according to the distribution network voltage, so that the power supply quality is improved; automatic meter reading and charging, ensuring the accuracy of meter reading data and the time of meter reading, and improving the economic benefit and the working efficiency of enterprises; in combination with the wireless network, an automated electricity usage service is provided for the user. Distribution automation performs a large number of repetitive tasks with as little human intervention as possible, helping to make greater use of the potential of the distribution network and ensuring that the quality of the electrical energy provided to the users meets the requirements. The technology required for realizing distribution network automation is mature, and both power companies and users can obtain benefits from distribution automation.
The remote terminal equipment of the distribution transformer, namely the distribution transformer terminal equipment (TransformersupervisoryTerminal Unit, TTU) is an important component part in the distribution network automation system, and the running reliability of the TTU is lower although the distribution network automation system is developed more mature at present.
Disclosure of Invention
In view of the above, the invention provides a remote terminal device of a distribution transformer, which has higher operation reliability.
The embodiment of the invention provides a remote terminal device of a distribution transformer, which comprises: the device comprises a power supply unit, a first processing unit and a second processing unit; the power supply unit comprises a switching power supply, a first voltage conversion circuit, a second voltage conversion circuit and a standby circuit;
the switching power supply is respectively connected with the first voltage conversion circuit and the second processing unit, the first voltage conversion circuit is respectively connected with the second voltage conversion circuit and the standby circuit, and the second voltage conversion circuit is respectively connected with the first processing unit and the second processing unit; the first processing unit is connected with the second processing unit;
the switching power supply is used for receiving alternating voltage provided by an external distribution transformer and converting the alternating voltage into a first direct voltage and a second direct voltage; the first direct current voltage flows to the second processing unit and is used for supplying power to the second processing unit so as to realize a terminal data acquisition function of the second processing unit; the second direct current voltage flows to the first voltage conversion circuit, and the first voltage conversion circuit is used for converting the second direct current voltage into a third direct current voltage;
the third direct current voltage flows to the second voltage conversion circuit and the standby circuit respectively, the second voltage conversion circuit is used for converting the third direct current voltage into a fourth direct current voltage, and the fourth direct current voltage is used for supplying power to the first processing unit and the second processing unit; the standby circuit is used for converting the third direct-current voltage into a fifth direct-current voltage, and the fifth direct-current voltage flows to a lithium battery connected with the standby circuit so as to charge the lithium battery; when the first processing unit or the second processing unit is powered down, the standby circuit is used for converting a fifth direct current voltage stored in the lithium battery into a third direct current voltage, and the third direct current voltage obtained through conversion of the standby circuit flows to the second voltage conversion circuit so as to realize power supply of the first processing unit and the second processing unit;
the first processing unit is used for receiving the terminal data acquired by the second processing unit and sending the terminal data.
Optionally, the first processing unit includes a first main control chip, a wireless transmission chip and a communication interface;
the first main control chip, the wireless transmission chip and the communication interface are all connected with the second voltage conversion circuit;
the first main control chip is respectively connected with the wireless transmission chip, the communication interface and the second processing unit;
the first main control chip is used for receiving the terminal data acquired by the second processing unit, the wireless transmission chip is used for transmitting the terminal data, and the communication interface is used for transmitting the terminal data.
Optionally, the distribution transformer remote terminal device further comprises a clock circuit;
the clock circuit is respectively connected with the first voltage conversion circuit and the first main control chip, and the model of the clock circuit is SLM1302.
Optionally, the wireless transmission chip is an EC20-LCC chip, and the communication interfaces are an RS232 interface and an RS485 interface.
Optionally, the second processing unit includes a second main control chip and a collector;
the second main control chip is connected with the second voltage conversion circuit;
the second main control chip is connected with the first main control chip;
the collector is connected with the switching power supply, the first direct current voltage flows to the collector, and the first direct current voltage is used for supplying power to the collector so as to realize a terminal data collection function of the collector;
the second main control chip is connected with the collector, the collector is used for collecting the terminal data and transmitting the terminal data to the second main control chip, and the second main control chip is used for transmitting the terminal data to the first main control chip.
Optionally, the collector is FKR-21.
Optionally, the standby circuit comprises a charging circuit and a discharging circuit;
the charging circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, and is connected with the lithium battery; the charging circuit is used for converting the third direct-current voltage into a fifth direct-current voltage, and the fifth direct-current voltage flows to the lithium battery to charge the lithium battery;
the discharging circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, the discharging circuit is connected with the lithium battery, the discharging circuit is connected with the first main control chip and the second main control chip, and when the discharging circuit receives a power-down signal transmitted by the first main control chip or the second main control chip, the discharging circuit is used for converting a fifth direct-current voltage stored in the lithium battery into a third direct-current voltage, and the third direct-current voltage obtained through the conversion of the discharging circuit flows to the second voltage conversion circuit so as to realize the power-on of the first main control chip and the second main control chip.
Optionally, the discharging circuit comprises a gate circuit, a triode and a voltage conversion chip;
the gate circuit is connected with the first main control chip and the second main control chip respectively; the triode is connected between the gate circuit and the voltage conversion chip;
when the gate circuit receives a power-down signal transmitted by the first main control chip or the second main control chip, the gate circuit is used for triggering the triode to be conducted, the voltage conversion chip is used for obtaining a fifth direct-current voltage stored in the lithium battery, converting the fifth direct-current voltage into a third direct-current voltage, and the third direct-current voltage obtained through conversion of the voltage conversion chip flows to the second voltage conversion circuit so as to realize power supply of the first main control chip and the second main control chip.
Optionally, the standby circuit further comprises a protection circuit;
the protection circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, and is connected with the lithium battery;
the protection circuit is used for preventing the fifth direct current voltage stored in the lithium battery from flowing back.
Optionally, the gate circuit is of a model 74AHC1G02, and the voltage conversion chip is of a model IRF7726.
Advantageous effects
According to the remote terminal equipment of the distribution transformer, provided by the embodiment of the invention, the power supply unit can provide various power supply voltages to realize the charge and discharge of the first processing unit, the second processing unit and the lithium battery, and because the power supply unit converts the alternating voltage provided by the external distribution transformer, the interference caused by additional power is reduced, the anti-interference performance of the remote terminal equipment of the whole distribution transformer is improved, when the first processing unit or the second processing unit is powered down, the power supply unit can control the lithium battery to discharge to realize the continuous power supply of the first processing unit or the second processing unit, and the normal work of the first processing unit or the second processing unit is ensured when the first processing unit or the second processing unit is powered down, so that the operation reliability of the remote terminal equipment of the distribution transformer is improved.
The terminal data is collected and transmitted by adopting the double CPU modes of the first processing unit and the second processing unit, so that the data can be collected and analyzed more efficiently.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a remote terminal device 100 for a distribution transformer according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a first voltage conversion circuit 11 according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a second voltage conversion circuit 12 and a standby circuit 13 according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a discharging circuit 132 according to an embodiment of the present invention.
Icon:
100-distribution transformer remote terminal equipment;
1-a power supply unit; 10-switching power supply; 11-a first voltage conversion circuit; 12-a second voltage conversion circuit; 13-a standby circuit; 131-a charging circuit; 132-a discharge circuit; 1321-gate circuit; 1322-triode; 1323-voltage conversion chip; 133-a protection circuit; a 14-lithium battery;
2-a first processing unit; 21-a first main control chip; 22-a wireless transmission chip; a 23-communication interface;
3-a second processing unit; 31-a second main control chip; 32-collector;
4-clock circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The inventor finds that the operation reliability of the existing TTU is lower, for example, the existing TTU is difficult to meet the requirements of different voltage levels of each chip or circuit, and the existing TTU is mostly provided with power supplies with different voltage levels in a mode of adding the requirements of multiple voltage levels, but the power supplies are also introduced to interfere with each other, so that the interference resistance of the TTU is poor, and the existing TTU can cause interruption of data acquisition, processing and transmission when power is lost.
The above prior art solutions have all the drawbacks that the inventors have obtained after practice and careful study, and thus the discovery process of the above problems and the solutions presented below by the embodiments of the present invention for the above problems should be all contributions to the present invention by the inventors during the present invention.
Based on the above researches, the embodiment of the invention provides a remote terminal device of a distribution transformer, which has higher operation reliability.
Fig. 1 shows a block diagram of a remote terminal device 100 for a distribution transformer according to an embodiment of the present invention, and it can be seen that the remote terminal device 100 for a distribution transformer includes a power supply unit 1, a first processing unit 2, a second processing unit 3, and a clock circuit 4.
The power supply unit 1 includes a switching power supply 10, a first voltage conversion circuit 11, a second voltage conversion circuit 12, and a standby circuit 13. The first processing unit 2 includes a first main control chip 21, a wireless transmission chip 22, and a communication interface 23. The second processing unit 3 includes a second main control chip 31 and a collector 32.
Further, the switching power supply 10 is respectively connected to the first voltage conversion circuit 11 and the collector 32, the first voltage conversion circuit 11 is respectively connected to the second voltage conversion circuit 12 and the standby circuit 13, and the second voltage conversion circuit 12 is respectively connected to the first main control chip 21, the wireless transmission chip 22, the communication interface 23 and the second main control chip 31. It can be understood that the switching power supply 10, the first voltage conversion circuit 11 and the second voltage conversion circuit 12 are mutually matched, so that conversion of various voltage levels can be realized, and further, the voltage level requirements of the first main control chip 21, the wireless transmission chip 22, the communication interface 23, the second main control chip 31 and the collector 32 are met, additional introduction of other power supplies is avoided, further, interference introduced by the power supplies is reduced, and the anti-interference performance of the whole distribution transformer remote terminal device 100 is improved.
For example, the switching power supply 10 is configured to receive an ac voltage (220V) provided by an external distribution transformer, transform, rectify and filter the ac voltage (220V), and further convert the ac voltage into a first dc voltage (24V) and a second dc voltage (12V).
The first direct current voltage (24V) supplies power to the collector 32 to realize the terminal data acquisition function of the collector 32, and it can be understood that the terminal data acquisition function of the collector 32 is a remote signaling telemetry function, and in this embodiment, the model of the collector 32 is selected from but not limited to fkm-21.
The second direct current voltage (12V) flows to the first voltage conversion circuit 11, and the first voltage conversion circuit 11 is configured to convert the second direct current voltage (12V) into a third direct current voltage (5V). The third direct-current voltage (5V) flows to the second voltage conversion circuit 12 and the backup circuit 13, respectively.
The second voltage conversion circuit 12 is configured to convert a third direct current voltage (5V) into a fourth direct current voltage (3.3V), and the fourth direct current voltage (3.3V) is configured to supply power to the first main control chip 21 and the second main control chip 31. The standby circuit 13 is configured to convert the third dc voltage (5V) into a fifth dc voltage (2.7V), and the fifth dc voltage (2.7V) flows to a lithium battery 14 connected to the standby circuit 13 to charge the lithium battery 14. When the first main control chip 21 or the second main control chip 31 is powered down, the standby circuit 13 is configured to convert the fifth direct current voltage (2.7V) stored in the lithium battery 14 into the third direct current voltage (5V), and the third direct current voltage (5V) obtained through conversion by the standby circuit 13 flows to the second voltage conversion circuit 12 to realize the power supply to the first main control chip 21 or the second main control chip 31, so that the operation can be continued when the first main control chip 21 or the second main control chip 31 is powered down, and the operation reliability of the remote terminal device 100 of the whole distribution transformer is improved.
With continued reference to fig. 1, the first main control chip 21 is respectively connected with the wireless transmission chip 22, the communication interface 23 and the second main control chip 31, the second main control chip 31 is connected with the collector 32, the collector 32 is used for collecting terminal data (voltage, current, active power, reactive power, etc.), transmitting the terminal data to the second main control chip 31, the second main control chip 31 is used for transmitting the terminal data to the first main control chip 21, the wireless transmission chip 22 and the communication interface 23 are used for transmitting or transmitting the terminal data, in this embodiment, the wireless transmission chip 22 is an EC20-LCC chip, and the communication interface 23 is an RS232 interface and an RS485 interface. It can be appreciated that the data can be collected and analyzed more efficiently by adopting the dual design of the first main control chip 21 and the second main control chip 31, wherein the first main control chip 21 can adopt an ARM chip, and the second main control chip 31 can adopt a low-power chip.
With continued reference to fig. 1, the clock circuit 4 may employ an SLM1302 chip, where the clock circuit 4 is connected to the first voltage conversion circuit 11 and the first master control chip 21, and the clock circuit 4 can ensure that the clock of the first master control chip 21 is not lost when the power is turned off or reset. The SLM1302 chip has a complete clock and calendar function, and the time information inside the SLM1302 chip can be kept for a long time, and the clock is accurate.
Fig. 2 shows a schematic circuit diagram of a first voltage conversion circuit 11 according to an embodiment of the present invention, and it can be seen that the second dc voltage (12V) is converted into the third dc voltage (5V) by the first voltage conversion circuit 11, where the third dc voltage (5V) is VCC in fig. 2. It will be appreciated that the first voltage conversion circuit 11 is formed by the chip TPS54331 and related circuit components, which will not be described further herein.
Fig. 3 shows a schematic circuit diagram of a second boost converter circuit 12 and a standby circuit 13 according to an embodiment of the present invention. As can be seen, the second boost converter 12 is composed of a TPS54331 chip and related circuit components for converting the third dc voltage (5V) to a fourth dc voltage (3.3V), and the fourth dc voltage (3.3V) is used for supplying power to the first and second main control chips 21 and 31.
With continued reference to fig. 3, the standby circuit 13 includes a charging circuit 131 and a protection circuit 133, the charging circuit 131 is connected between the first voltage conversion circuit 11 and the second voltage conversion circuit 12, the charging circuit 131 is further connected to the lithium battery 14, the charging circuit 131 is configured to convert a third direct current voltage (5V) into a fifth direct current voltage (2.7V) to charge the lithium battery 14, wherein the LM2703 chip and surrounding circuit components complete the voltage level conversion, and it can be understood that the fifth direct current voltage (2.7V) is VCAP in fig. 3. The protection circuit 133 is connected between the first voltage conversion circuit 11 and the second voltage conversion circuit 12, the protection circuit 133 is further connected to the lithium battery 14, and the protection circuit 133 is used for preventing the backflow of the fifth direct current voltage (2.7V) stored in the lithium battery 14, and in this embodiment, the protection circuit 133 includes a plurality of diodes as shown in fig. 3.
Referring to fig. 4, the standby circuit 13 further includes a discharging circuit 132, and the discharging circuit 132 includes a gate 1321, a transistor 1322 and a voltage conversion chip 1323. The gate 1321 is connected to the first main control chip 21 and the second main control chip 31, the triode 1322 is connected between the gate 1321 and the voltage conversion chip 1323, when the gate 1321 receives a power-down signal transmitted by the first main control chip 21 or the second main control chip 31, the gate 1321 triggers the triode 1322 to be turned on, and the voltage conversion chip 1323 is used for obtaining the VCAP stored in the lithium battery 14 and converting the VCAP into a third direct current voltage (5V), that is, VCC in fig. 4, and the VCC flows to the second voltage conversion circuit 12 to realize power-on of the first main control chip 21 and the second main control chip 31.
In this embodiment, the gate 1321 is model 74AHC1G02, and the voltage conversion chip 1323 is model IRF7726.
Optionally, the remote terminal equipment of the distribution transformer communicates with the master station through a GPRS4G network, so that timeliness of terminal data transmission is guaranteed.
In summary, the distribution transformer remote terminal equipment provided by the embodiment of the invention has the advantages of high terminal data acquisition, processing and transmission efficiency, good timeliness, strong anti-interference capability, normal operation under the condition of power failure and higher operation reliability.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A distribution transformer remote terminal device, comprising: the device comprises a power supply unit, a first processing unit and a second processing unit; the power supply unit comprises a switching power supply, a first voltage conversion circuit, a second voltage conversion circuit and a standby circuit;
the switching power supply is respectively connected with the first voltage conversion circuit and the second processing unit, the first voltage conversion circuit is respectively connected with the second voltage conversion circuit and the standby circuit, and the second voltage conversion circuit is respectively connected with the first processing unit and the second processing unit; the first processing unit is connected with the second processing unit;
the switching power supply is used for receiving alternating voltage provided by an external distribution transformer and converting the alternating voltage into a first direct voltage and a second direct voltage; the first direct current voltage flows to the second processing unit and is used for supplying power to the second processing unit so as to realize a terminal data acquisition function of the second processing unit; the second direct current voltage flows to the first voltage conversion circuit, and the first voltage conversion circuit is used for converting the second direct current voltage into a third direct current voltage;
the third direct current voltage flows to the second voltage conversion circuit and the standby circuit respectively, the second voltage conversion circuit is used for converting the third direct current voltage into a fourth direct current voltage, and the fourth direct current voltage is used for supplying power to the first processing unit and the second processing unit; the standby circuit is used for converting the third direct-current voltage into a fifth direct-current voltage, and the fifth direct-current voltage flows to a lithium battery connected with the standby circuit so as to charge the lithium battery; when the first processing unit or the second processing unit is powered down, the standby circuit is used for converting a fifth direct current voltage stored in the lithium battery into a third direct current voltage, and the third direct current voltage obtained through conversion of the standby circuit flows to the second voltage conversion circuit so as to realize power supply of the first processing unit and the second processing unit;
the first processing unit is used for receiving the terminal data acquired by the second processing unit and sending the terminal data.
2. The distribution transformer remote terminal device of claim 1, wherein the first processing unit comprises a first master control chip, a wireless transmission chip, and a communication interface;
the first main control chip, the wireless transmission chip and the communication interface are all connected with the second voltage conversion circuit;
the first main control chip is respectively connected with the wireless transmission chip, the communication interface and the second processing unit;
the first main control chip is used for receiving the terminal data acquired by the second processing unit, the wireless transmission chip is used for transmitting the terminal data, and the communication interface is used for transmitting the terminal data.
3. The distribution transformer remote terminal device of claim 2, wherein the distribution transformer remote terminal device further comprises a clock circuit;
the clock circuit is respectively connected with the first voltage conversion circuit and the first main control chip, and the model of the clock circuit is SLM1302.
4. The distribution transformer remote terminal device of claim 2, wherein the wireless transmission chip is an EC20-LCC chip and the communication interfaces are an RS232 interface and an RS485 interface.
5. The distribution transformer remote terminal device of claim 2, wherein the second processing unit comprises a second master control chip and a collector;
the second main control chip is connected with the second voltage conversion circuit;
the second main control chip is connected with the first main control chip;
the collector is connected with the switching power supply, the first direct current voltage flows to the collector, and the first direct current voltage is used for supplying power to the collector so as to realize a terminal data collection function of the collector;
the second main control chip is connected with the collector, the collector is used for collecting the terminal data and transmitting the terminal data to the second main control chip, and the second main control chip is used for transmitting the terminal data to the first main control chip.
6. The distribution transformer remote terminal device of claim 5, wherein the collector is of the type fkm-21.
7. The distribution transformer remote terminal device of claim 5, wherein the backup circuit comprises a charging circuit and a discharging circuit;
the charging circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, and is connected with the lithium battery; the charging circuit is used for converting the third direct-current voltage into a fifth direct-current voltage, and the fifth direct-current voltage flows to the lithium battery to charge the lithium battery;
the discharging circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, the discharging circuit is connected with the lithium battery, the discharging circuit is connected with the first main control chip and the second main control chip, and when the discharging circuit receives a power-down signal transmitted by the first main control chip or the second main control chip, the discharging circuit is used for converting a fifth direct-current voltage stored in the lithium battery into a third direct-current voltage, and the third direct-current voltage obtained through the conversion of the discharging circuit flows to the second voltage conversion circuit so as to realize the power-on of the first main control chip and the second main control chip.
8. The distribution transformer remote terminal device of claim 7, wherein the discharge circuit comprises a gate, a transistor, and a voltage conversion chip;
the gate circuit is connected with the first main control chip and the second main control chip respectively; the triode is connected between the gate circuit and the voltage conversion chip;
when the gate circuit receives a power-down signal transmitted by the first main control chip or the second main control chip, the gate circuit is used for triggering the triode to be conducted, the voltage conversion chip is used for obtaining a fifth direct-current voltage stored in the lithium battery, converting the fifth direct-current voltage into a third direct-current voltage, and the third direct-current voltage obtained through conversion of the voltage conversion chip flows to the second voltage conversion circuit so as to realize power supply of the first main control chip and the second main control chip.
9. The distribution transformer remote terminal device of claim 8, wherein the backup circuit further comprises a protection circuit;
the protection circuit is connected between the first voltage conversion circuit and the second voltage conversion circuit, and is connected with the lithium battery;
the protection circuit is used for preventing the fifth direct current voltage stored in the lithium battery from flowing back.
10. The distribution transformer remote terminal device of claim 8, wherein the gate circuit is model 74AHC1G02 and the voltage conversion chip is model IRF7726.
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| CN201811213351.5A CN109088478B (en) | 2018-10-17 | 2018-10-17 | Remote terminal equipment of distribution transformer |
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