CN111929523A - Low-voltage transformer area topology rapid identification system - Google Patents

Low-voltage transformer area topology rapid identification system Download PDF

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Publication number
CN111929523A
CN111929523A CN202010982881.7A CN202010982881A CN111929523A CN 111929523 A CN111929523 A CN 111929523A CN 202010982881 A CN202010982881 A CN 202010982881A CN 111929523 A CN111929523 A CN 111929523A
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China
Prior art keywords
voltage
resistor
current
pin
transformer
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CN202010982881.7A
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Chinese (zh)
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CN111929523B (en
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王永生
张自变
耿树军
邓士伟
苗青
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Jiangsu Zhizhen Energy Technology Co ltd
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Jiangsu Zhizhen Energy Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • H02J13/00001—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 characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J13/00002—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 characterised by monitoring
    • 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
    • H02J13/00006—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention relates to a low-voltage transformer area topology quick identification system, which belongs to the technical field of intelligent power grids and intelligent power utilization and comprises a PDA (personal digital assistant) handheld terminal, a master station server and a low-voltage transformer area topology quick identification instrument, wherein the low-voltage transformer area topology quick identification instrument comprises an identification instrument host and an identification instrument slave, the identification instrument host, the identification instrument slave and the PDA handheld terminal are respectively connected with the master station server through 4G communication modules, the identification instrument slave comprises a slave trigger circuit, the slave trigger circuit comprises an MCU (microprogrammed control unit) pulse control circuit, a triode switch circuit and a solid-state relay JD1, the trigger signal output end of the MCU pulse control circuit is connected with the weak current end of the solid-state relay JD1 through the triode switch circuit, and the strong current end of the solid-state relay JD1 is connected with the AC220V phase. The method can solve the problem that the topological relation of the low-voltage transformer area is not clear, and meets the requirement that an electric power company and a power supply department quickly identify the topological structure of the low-voltage transformer area.

Description

Low-voltage transformer area topology rapid identification system
Technical Field
The invention relates to a low-voltage transformer area topology rapid identification system, and belongs to the technical field of intelligent power grids and intelligent power utilization.
Background
Many old cells and remote areas in China have the problems of disordered power project filing and uncertain platform area topology. At present, due to the fact that a plurality of low-voltage transformer areas lack accurate line topological relation graphs, when a line breaks down, the problem that rapid and accurate troubleshooting is difficult to achieve exists, and the problems of low troubleshooting efficiency, long period and high cost exist. A large amount of manpower, material resources and financial resources are wasted, and the final problem cannot be effectively solved. For the problem, a common practice in the prior art is to provide the topology data of the transformer area, which is saved during the construction of the transformer area, by a power supply department. However, the power distribution areas of the power company are large in quantity and complex in electrical wiring, and a private building phenomenon also exists, and especially for some old districts and remote areas, due to the reasons that various load adjustments are not filed and adjusted in time and the registration is wrong, the original topological relation information obtained from the power supply department during the building of the power distribution areas is usually incomplete and unreliable.
The reason for the topological relation error of the low-voltage transformer area mainly has three aspects: (1) a user ammeter file error is caused during the construction of the low-voltage transformer area, so that a low-voltage transformer area topology error is caused; (2) insufficient attention is paid to the transformer area, only partial transformer area information is recorded in the building process, and topology information of some low-voltage transformer areas is lost; (3) when the low-voltage transformer area has faults, no record or error record is generated when wiring is adjusted in routing inspection and first-aid repair, so that the low-voltage transformer area topology error is caused.
In order to solve the problem of unclear platform area topology, many power companies and power supply departments have started some testing work on perfecting platform area profiling and defining platform area topology relations.
Disclosure of Invention
In order to solve the technical problem, the invention provides a low-voltage distribution area topology rapid identification system, which has the following specific technical scheme: including handheld terminal of PDA and main website server, still include the quick recognizer of low pressure platform district topology, the quick recognizer of low pressure platform district topology includes recognizer host computer and recognizer slave computer, recognizer host computer, recognizer slave computer and PDA handheld terminal respectively through 4G communication module with the main website server links to each other, the recognizer slave computer includes from machine trigger circuit, from machine trigger circuit including MCU pulse control circuit, triode switch circuit and solid state relay JD1, MCU pulse control circuit's trigger signal output passes through triode switch circuit links to each other with solid state relay JD 1's weak electric terminal, and solid state relay JD 1's strong electric terminal passes through load resistance R1 and links to each other with the AC220V looks voltage in the platform district that awaits measuring.
Further, the triode switch circuit comprises an NPN type triode Q1, a trigger signal output end TR1-PC8 of the MCU pulse control circuit is connected with a base electrode of a triode Q1 through a resistor R36, the base electrode of the triode Q1 is grounded through a resistor R38 and a capacitor C41 which are mutually connected in parallel, an emitting electrode of the triode Q1 is grounded, and a collector electrode of the triode Q1 is connected with a +5V power supply through a resistor R40 and a light emitting diode LED20 which are connected in series; the collector of the triode Q1 is connected with the negative electrode of the weak current end of the solid-state relay JD1, and the positive electrode of the weak current end of the solid-state relay JD1 is connected with the +5V power supply.
Furthermore, the L end of the strong electric end of the solid-state relay JD1 is connected with the zero line of the AC220V through a fuse F2, and the N end of the strong electric end of the solid-state relay JD1 is connected with the live line of the AC220V through a load resistor R1 and a temperature-controlled switch SW1 which are connected in series; the rated voltage of the fuse F2 is 250V, and the fusing current is 3A; temperature controlled switch SW1 is model number KSD-9700.
Furthermore, the model of the triode Q1 is an S8050 triode, the resistance of the resistor R36 is 1K Ω, the resistance of the resistor R38 is 10K Ω, the capacitance of the capacitor C41 is 0.1 μ F, and the resistance of the resistor R40 is 1K Ω.
Furthermore, the main machine of the identification instrument comprises an AC380V voltage interface, a current transformer interface, a voltage acquisition circuit, a voltage filter circuit, a current acquisition circuit, a current filter circuit, a power supply module, a main machine MCU and a main machine 4G communication module, wherein the AC380V voltage interface is connected with the input end of the voltage acquisition circuit, the output end of the voltage acquisition circuit is connected with the input end of the voltage filter circuit, the output end of the voltage filter circuit is connected with the voltage signal input end of the main machine MCU, and the output end of the voltage filter circuit provides power for each unit of the main machine through the power supply module; the input end of the current acquisition circuit is connected with the current transformer interface, the output end of the current acquisition circuit is connected with the input end of the current filter circuit, and the output end of the current filter circuit is connected with the current signal input end of the host MCU; the signal output end of the host MCU is in signal connection with the master station server through the host 4G communication module; the signal output end of the host MCU is also connected with the liquid crystal display
Further, the voltage acquisition circuit comprises a transformer PT1, a transformer PT2 and a transformer PT3, wherein a primary winding of the transformer PT1 is connected with A-phase alternating current, a secondary winding of the transformer PT1 is connected with a voltage signal end Ua1, and two ends of the secondary winding are connected with a thermistor RB13 in parallel; the primary winding of the transformer PT2 is connected with B alternating current, the secondary winding of the transformer PT2 is connected with a voltage signal end Ub1, and two ends of the secondary winding are connected with a thermistor RB14 in parallel; the primary winding of the transformer PT3 is connected with C alternating current, the secondary winding of the transformer PT3 is connected with a voltage signal end Uc1, and a thermistor RB15 is connected in parallel with the two ends of the secondary winding.
Further, in the voltage filter circuit, the voltage signal terminal Ua1 is grounded through a zener diode T1, the voltage signal terminal Ub1 is grounded through a zener diode T2, and the voltage signal terminal Uc1 is grounded through a zener diode T3; the voltage signal end Ua1 is connected with the voltage signal end Ua1 'through a resistor R1 and a resistor R20 which are connected in series, the resistor R1 and the resistor R20 are grounded through a filter capacitor C1, and the resistor R20 and the voltage signal end Ua 1' are grounded through a filter capacitor C20; the voltage signal end Ub1 is connected with a voltage signal end Ub1 'through a resistor R2 and a resistor R21 which are connected in series, the resistor R2 and the resistor R21 are grounded through a filter capacitor C2, and the resistor R21 and the voltage signal end Ub 1' are grounded through a filter capacitor C21; the voltage signal end Uc1 is connected with the voltage signal end Uc1 'through a resistor R3 and a resistor R22 which are connected in series, the resistor R3 and the resistor R22 are grounded through a filter capacitor C3, and the resistor R22 and the voltage signal end Uc 1' are grounded through a filter capacitor C22.
Furthermore, the current transformer interfaces are provided with three groups of PBK sockets, wherein two groups of current transformer interfaces are respectively connected with corresponding current transformer adapter boxes (2) through PAG sheath plug connecting wires (1), and each group of current transformer adapter boxes (2) is respectively connected with outgoing currents of three pincerlike transformers; in the current filter circuit, each path of current input signal adopts second-order RC filtering.
Further, a PA0 port of the host MCU is connected to the voltage signal terminal Ua1 ', a PA1 port is connected to the voltage signal terminal Ub1 ', and a PA2 port is connected to the voltage signal terminal Uc1 '; and the PA 2-PA 7 port, the PB0 port, the PB1 port, the PC0 port and the PC1 port of the host MCU are respectively connected with the filtered current signal input end.
Further, the host 4G communication module includes an isolator chip (U5) and a 4G interface (P5), pin 1 of the 4G interface is connected to pin 2, and is connected to +12V voltage through an inductor B4, pin 3 and pin 4 are connected in parallel to ground GND2, pin 5 is connected to an output signal terminal TXDM through a resistor RT2, pin 7 is connected to an output signal terminal SETM through a resistor RT3, pin 8 is connected to an input signal terminal RXDM through a resistor RT4, pin 9 is connected to an input signal terminal RSTM through a resistor RT5, and pin 10 is connected to an output signal terminal STAM through a resistor RT 6; the isolator chip (U5) inputs 3.3V voltage through a pin 1, the pin 1 is grounded through a voltage stabilizing capacitor C3, a pin 2 is connected with an input signal end PWR PD 04G of the MCU, a pin 3 is connected with an input signal end TX PC 104G of the MCU, a pin 4 is connected with an input signal end PD 24G of the MCU, a pin 6 is connected with an input signal end UART3 RX PC11 of the MCU, and a pin 7 is connected with an input signal end LINK PC 124G of the MCU; pin 10 is connected with output signal terminal STAM, pin 11 is connected with output signal terminal TXDM, pin 13 is connected with input signal terminal RSTM, pin 14 is connected with input signal terminal RXDM, pin 15 is connected with output signal terminal SETM, pin 15 inputs +5V voltage and is grounded through voltage stabilizing capacitor C30; the output signal terminal STAM, the output signal terminal TXDM, the input signal terminal RSTM, the input signal terminal RXDM and the output signal terminal SETM are respectively connected with a +5V power supply through 10K omega resistors.
The invention has the beneficial effects that: 1. the PDA hand-held terminal sends a 'start trigger identification instruction' to the master station server, and after the master station server successfully analyzes the 'start trigger identification instruction', the 'trigger instruction' is sent to the identification instrument slave machine, and a 'capture instruction' is sent to the identification instrument host machine for capture; the recognition instrument slave machine is arranged at a user meter box and is triggered after receiving a trigger instruction to cause the power change of a user load and generate a characteristic waveform of the line power change; installing the main machine of the identification instrument near the concentrator or the outgoing line cabinet, and testing the current of the concentrator or the outgoing line cabinet by using a current transformer; the host machine of the identification instrument identifies according to the characteristic waveform triggered by the slave machine, the identification result is uploaded to the master station server after the identification is finished, the master station server records data and issues the identification result to the PDA handheld terminal, and the PDA handheld terminal displays the corresponding topology in real time; and the topology of the whole low-voltage platform area is completed through multiple tests.
2. The MCU pulse control circuit sends out a specific pulse waveform according to the instruction of the main station, so that the trigger signal output ends TR1-PC8 output high level or low level, and in a default state, the trigger signal output ends TR1-PC8 are low level, the triode Q1 is cut off, the light-emitting diode LED20 is turned off, the strong current end of the solid-state relay JD1 is disconnected, and the load resistor R1 does not work. When the trigger signal output end TR1-PC8 outputs a high level, the triode Q1 is conducted, the light-emitting diode LED20 is bright, the strong current end of the solid-state relay JD1 is closed, the AC220V acts on the load resistor R1 to generate a specific power pulse waveform, and after the host computer successfully captures the power pulse waveform, the test is finished.
3. The solid-state relay JD1 can quickly realize the on-off control of the load resistor R1, the generation of load waveforms is met, the triggering efficiency is high, and after the load resistor R1 is triggered, a host machine can easily capture signals. The power of the load resistor is usually more than 5% of the normal working power of the transformer, so that the reliable identification of the identification instrument host is facilitated.
4. When the solid-state relay JD1 is turned on, the load resistor R1 serves as a resistive load by utilizing the pure resistive principle, and the resistance value of the load resistor R1 can be adjusted according to different power requirements, so that the identification instrument host can reliably identify the load resistor R1.
5. The fuse F2 functions as a protection circuit and a load resistor module, and blows out when the current is too large, thereby protecting the solid-state relay JD1 and the load resistor R1. The temperature control switch SW1 can monitor the temperature of the load resistor R1 in real time, the default state is closed, and when the temperature of the load resistor R1 exceeds the action value, the temperature control switch SW1 is opened to cut off the circuit, so that the protection effect of the circuit is realized.
6. The identification instrument master-slave machine has simple structure, safety, reliability, simple operation and easy implementation and popularization; the recognition efficiency is high, the recognition effect is good, and the experience of the user is improved.
7. The identification instrument host collects voltage signals through a voltage interface of the AC380V, and provides the voltage signals to the host MCU for operation after filtering respectively, so as to monitor the power change of the power grid of the transformer area in real time. The identification instrument slave machine is arranged near the user meter box, the master station server sends an instruction to the identification instrument slave machine to start triggering, and the identification instrument slave machine generates a specific power pulse waveform after triggering; and meanwhile, the master station server sends an instruction to the identification instrument host through the host 4G communication module to prepare for capturing, the identification instrument host identifies according to the characteristic waveform triggered by the slave machine, and the identification result is uploaded to the master station server through the host 4G communication module.
8. And if the host computer of the identification instrument captures the power pulse waveform triggered by the slave computer, the user meter box where the slave computer is located is under the topological structure of the transformer substation or the outgoing line cabinet corresponding to the host computer of the identification instrument. And if the host computer of the identification instrument does not capture the power pulse waveform triggered by the slave computer, the user meter box where the slave computer is located is not under the topological structure of the transformer substation or the outgoing line cabinet corresponding to the host computer of the identification instrument. The host of the identification instrument is based on a load identification technology, whether the power variation of a concentrator or an outgoing line cabinet meets the specific waveform variation triggered by a slave is collected and tested, whether a meter box where the slave is located is under a station transformer or outgoing line cabinet topological structure corresponding to the host is judged, and the topological relation between the 'station-transformer' and the 'station-line-transformer' in a low-voltage station area can be identified. The 'household-transformer' refers to the relation between a user meter box and a low-voltage transformer. The 'household-line-transformer' refers to the relationship among a user meter box, an outgoing line cabinet and a low-voltage transformer.
9. The 380V alternating-current voltage of a three-phase four-wire system is input to a voltage acquisition circuit through a voltage interface of an AC380V, a voltage signal Ua, Ub and Uc is output after the voltage of the phase voltage Ua is reduced by a transformer PT1, a voltage signal Ua1 is output after the voltage of the phase voltage Ub is reduced by a transformer PT2, a voltage signal Ub1 is output after the voltage of the phase voltage Uc is reduced by a transformer PT3, a voltage signal Uc1 is output, and voltages Ua1 ', Ub1 ' and Uc1 ' are output through a second-order filter circuit; the voltage signals Ua1 ', Ub1 ' and Uc1 ' are input into the host MCU through pins PA0, PA1 and PA2 of the MCU respectively. And each input bus voltage AC220V is converted into a weak voltage signal which can be identified by the micro-controller MCU, so that the micro-controller MCU can collect and calculate.
10. The current acquisition circuit converts the input current signal into a weak voltage signal which can be identified by the host MCU, and the host MCU acquires and calculates the weak voltage signal. And the third current transformer interface can simply and conveniently test the current signal input by the concentrator through the open current transformer (3 channels). The current transformer adapter boxes 2 can be used for testing the outgoing line cabinet at the same time, and each group of current transformer adapter boxes 2 is connected with three pincerlike transformers to test the outgoing line current of the outgoing line cabinet. The PBK socket and the PAG plug have the functions of push-pull self-locking and plug-pull integration, and have the characteristics of reliable contact and simple and convenient use. And the current signal is input into the host MCU for power operation through second-order RC filtering. The voltage filter circuit and the current filter circuit can filter out interference signals, so that the input voltage and current signals are real and reliable, and the power calculated by the host MCU is more accurate.
11. The power supply module converts the input AC220V into low-voltage direct-current voltage and provides working power supply for the MCU, the host 4G communication module and the liquid crystal display; the liquid crystal display can display information such as the address of a host computer of the tester, the strength of a 4G signal, the working state and the like. The host 4G communication module is used for carrying out wireless communication between the identification instrument host and the master station server and uploading a result captured by the host and the like to the master station server.
12. The main machine of the recognizer has compact structure and portable design, adopts large-size liquid crystal display on the front surface, has the advantages of 4G communication, multi-channel alternating current analog quantity and the like, is simple to install on site, and is easy to test; the voltage acquisition adopts quick aerial plug, 4-channel input, small volume, convenient plug and easy use; the current input adopts PBK socket and PAG plug, and the push-pull auto-lock, plug are integrative, have the contact reliable, convenient characteristics simple to use. The host has more current acquisition channels, small volume and convenient plugging, and meets the requirements of field multipath current acquisition; 2 groups of current transformer adapter boxes and 1 group of open-ended transformers are matched, 3 groups of 9 channels are provided, and 6 outgoing line cabinet currents and 3 concentrator currents can be tested simultaneously; the main machine of the identification instrument adopts a high-speed sampling design, the current and voltage acquisition speed is high, the precision is high, and the algorithm is easy to realize.
Drawings
Figure 1 is a schematic block diagram of a low-voltage zone topology rapid identification system of the present invention,
figure 2 is a schematic circuit diagram of the slave of the identification instrument of the present invention,
figure 3 is a schematic block diagram of the identifier host of the present invention,
figure 4 is a schematic diagram of a voltage acquisition circuit and a voltage filter circuit in the main body of the identification instrument,
figure 5 is a schematic diagram of the current acquisition circuit and the current filter circuit in the main body of the identification instrument,
figure 6 is a circuit diagram of the host 4G communication module in the identification appliance host,
fig. 7 is a connection structure diagram of a current transformer interface and a current transformer adapter box in the identification instrument host.
In fig. 7: PAG sheath plug connecting wire; 2. current transformer adapter box.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, the low-voltage distribution area topology rapid identification system of the invention comprises a PDA handheld terminal, a master station server and a low-voltage distribution area topology rapid identification instrument, wherein the low-voltage distribution area topology rapid identification instrument comprises an identification instrument host and an identification instrument slave, and the identification instrument host, the identification instrument slave and the PDA handheld terminal are respectively connected with the master station server through 4G communication modules.
The PDA hand-held terminal sends a 'start trigger identification instruction' to the master station server, and after the master station server successfully analyzes the 'start trigger identification instruction', the 'trigger instruction' is sent to the identification instrument slave machine, and a 'capture instruction' is sent to the identification instrument host machine for capture; the recognition instrument slave machine is arranged at a user meter box and is triggered after receiving a trigger instruction to cause the power change of a user load and generate a characteristic waveform of the line power change; installing the main machine of the identification instrument near the concentrator or the outgoing line cabinet, and testing the current of the concentrator or the outgoing line cabinet by using a current transformer; the host machine of the identification instrument identifies according to the characteristic waveform triggered by the slave machine, the identification result is uploaded to the master station server after the identification is finished, the master station server records data and issues the identification result to the PDA handheld terminal, and the PDA handheld terminal displays the corresponding topology in real time; and the topology of the whole low-voltage platform area is completed through multiple tests.
As shown in fig. 2, in the slave trigger circuit of the identifier slave, the trigger signal output end of the MCU pulse control circuit is connected to the weak current end of the solid-state relay JD1 through the triode switch circuit, and the strong current end of the solid-state relay JD1 is connected to the AC220V phase voltage of the platform area to be tested through the load resistor R1.
The triode switch circuit comprises an NPN type triode Q1, a trigger signal output end TR1-PC8 of the MCU pulse control circuit is connected with a base electrode of a triode Q1 through a resistor R36, the base electrode of the triode Q1 is grounded through a resistor R38 and a capacitor C41 which are mutually connected in parallel, an emitting electrode of the triode Q1 is grounded, and a collector electrode of the triode Q1 is connected with a +5V power supply through a resistor R40 and a light emitting diode LED20 which are connected in series; the collector of the triode Q1 is connected with the negative electrode of the weak current end of the solid-state relay JD1, and the positive electrode of the weak current end of the solid-state relay JD1 is connected with the +5V power supply. The resistance value of the resistor R36 is 1K omega, the resistance value of the resistor R38 is 10K omega, the capacity of the capacitor C41 is 0.1 muF, the resistance value of the resistor R40 is 1K omega, the rated voltage of the fuse F2 is 250V, and the fusing current is 3A; the model of the temperature control switch SW1 is KSD-9700, and the model of the triode Q1 is S8050 triode.
The L end of the strong electric end of the solid-state relay JD1 is connected with the zero line of the AC220V through a fuse F2, and the N end of the strong electric end of the solid-state relay JD1 is connected with the live line of the AC220V through a load resistor R1 and a temperature-controlled switch SW1 which are connected in series.
The master station issues the trigger command to the slave MCU pulse control circuit, and the MCU pulse control circuit sends out a specific pulse waveform according to the command of the master station, so that the trigger signal output end TR1-PC8 outputs high level or low level. In a default state, the trigger signal output end TR1-PC8 is at a low level, the triode Q1 is cut off, the light-emitting diode LED20 is turned off, the strong current end of the solid-state relay JD1 is disconnected, and the load resistor R1 does not work.
When the trigger signal output end TR1-PC8 outputs a high level, the triode Q1 is conducted, the light-emitting diode LED20 is bright, the strong current end of the solid-state relay JD1 is closed, the AC220V acts on the load resistor R1 to generate a specific power pulse waveform, and after the host computer successfully captures the power pulse waveform, the test is finished.
The fuse F2 functions as a protection circuit and a load resistor module, and blows out when the current is too large, thereby protecting the solid-state relay JD1 and the load resistor R1.
The temperature control switch SW1 can monitor the temperature of the load resistor R1 in real time, the default state is closed, and when the temperature of the load resistor R1 exceeds the action value, the temperature control switch SW1 is opened to cut off the circuit, so that the protection effect of the circuit is realized.
The MCU pulse control circuit sends out a specific waveform according to the instruction of the main station, the solid state relay JD1 controls the on and off of the load resistor R1, when the signal output by the trigger signal output end TR1-PC8 is at a low level, the triode Q1 is cut off, the light emitting diode LED20 is turned off, the solid state relay JD1 is turned off, and the load resistor R1 does not work. When the signal output by the trigger signal output end TR1-PC8 is at a high level, the triode Q1 is conducted, the light-emitting diode LED20 is bright, the strong current end of the solid-state relay JD1 is closed, and the phase voltage of the AC220V acts on the load resistor R1 to generate a load waveform.
As shown in fig. 3, the main unit of the identification instrument includes an AC380V voltage interface, a current transformer interface, a voltage acquisition circuit, a voltage filter circuit, a current acquisition circuit, a current filter circuit, a power module, a main unit MCU and a liquid crystal display, wherein an input end of the voltage acquisition circuit is connected to the AC380V voltage interface, an output end of the voltage acquisition circuit is connected to an input end of the voltage filter circuit, an output end of the voltage filter circuit is connected to a voltage signal input end of the main unit MCU, and an output end of the voltage filter circuit supplies power to each unit of the main unit through the power module; the input end of the current acquisition circuit is connected with the current transformer interface, the output end of the current acquisition circuit is connected with the input end of the current filter circuit, and the output end of the current filter circuit is connected with the current signal input end of the host MCU; and the signal output end of the host MCU is in signal connection with the master station server through the host 4G communication module. And the signal output end of the host MCU is also connected with the liquid crystal display.
As shown in fig. 4, the voltage acquisition circuit includes a transformer PT1, a transformer PT2 and a transformer PT3, a primary winding of the transformer PT1 is connected to a-phase alternating current, a secondary winding of the transformer PT1 is connected to a voltage signal terminal Ua1, and two ends of the secondary winding are connected in parallel to a thermistor RB 13; the primary winding of the transformer PT2 is connected with B alternating current, the secondary winding of the transformer PT2 is connected with a voltage signal end Ub1, and two ends of the secondary winding are connected with a thermistor RB14 in parallel; the primary winding of the transformer PT3 is connected with C alternating current, the secondary winding of the transformer PT3 is connected with a voltage signal end Uc1, and a thermistor RB15 is connected in parallel with the two ends of the secondary winding.
In the voltage filter circuit, a voltage signal end Ua1 is grounded through a Zener diode T1, a voltage signal end Ub1 is grounded through a Zener diode T2, and a voltage signal end Uc1 is grounded through a Zener diode T3; the voltage signal end Ua1 is connected with the voltage signal end Ua1 'through a resistor R1 and a resistor R20 which are connected in series, the resistor R1 and the resistor R20 are grounded through a filter capacitor C1, and the resistor R20 and the voltage signal end Ua 1' are grounded through a filter capacitor C20; the voltage signal end Ub1 is connected with a voltage signal end Ub1 'through a resistor R2 and a resistor R21 which are connected in series, the resistor R2 and the resistor R21 are grounded through a filter capacitor C2, and the resistor R21 and the voltage signal end Ub 1' are grounded through a filter capacitor C21; the voltage signal end Uc1 is connected with the voltage signal end Uc1 'through a resistor R3 and a resistor R22 which are connected in series, the resistor R3 and the resistor R22 are grounded through a filter capacitor C3, and the resistor R22 and the voltage signal end Uc 1' are grounded through a filter capacitor C22. The voltage filter circuit can filter out interference signals, so that the input voltage signals are real and reliable, and the power calculated by the host MCU is more accurate.
The 380V alternating-current voltage of a three-phase four-wire system is input to a voltage acquisition circuit through a voltage interface of an AC380V, a voltage signal Ua, Ub and Uc is output after the voltage of the phase voltage Ua is reduced by a transformer PT1, a voltage signal Ua1 is output after the voltage of the phase voltage Ub is reduced by a transformer PT2, a voltage signal Ub1 is output after the voltage of the phase voltage Uc is reduced by a transformer PT3, a voltage signal Uc1 is output, and voltages Ua1 ', Ub1 ' and Uc1 ' are output through a second-order filter circuit; the voltage signals Ua1 ', Ub1 ' and Uc1 ' are input into the host MCU through pins PA0, PA1 and PA2 of the MCU respectively. And each input bus voltage AC220V is converted into a weak voltage signal which can be identified by the micro-controller MCU, so that the micro-controller MCU can collect and calculate.
As shown in fig. 5 and 7, the current transformer interfaces are provided with three groups of PBK sockets, wherein the current transformer interface three passes through the open current transformer (3 channels), so that the current signal input by the concentrator can be simply and conveniently tested. The first current transformer interface and the second current transformer interface are respectively connected with corresponding current transformer adapter boxes 2 through PAG sheath plug connecting wires 1, and each group of current transformer adapter boxes 2 are respectively connected with outgoing currents of three pincerlike transformers. The current input adopts PBK socket and PAG plug, and the push-pull auto-lock, plug are integrative, have the contact reliable, convenient characteristics simple to use. The host has more current acquisition channels, small volume and convenient plugging, and meets the requirements of field multipath current acquisition; two sets of current transformer adapter boxes and 1 set of open-ended transformers are matched, and 3 sets of 9 channels are provided, so that six outgoing line cabinet currents and three concentrator currents can be tested simultaneously.
The current acquisition circuit converts the input current signal into a weak voltage signal which can be identified by the host MCU, and the host MCU acquires and calculates the weak voltage signal. In the current filter circuit, each path of current input signal adopts second-order RC filtering. The current filter circuit can filter out interference signals, so that input current signals are real and reliable, and the power calculated by the host MCU is more accurate.
As shown in fig. 6, the host 4G communication module includes an isolator chip U5 and a 4G interface P5, pin 1 of the 4G interface is connected to pin 2, and is connected to +12V voltage through an inductor B4, pin 3 and pin 4 are connected in parallel to ground GND2, pin 5 is connected to an output signal terminal TXDM through a resistor RT2, pin 7 is connected to an output signal terminal SETM through a resistor RT3, pin 8 is connected to an input signal terminal RXDM through a resistor RT4, pin 9 is connected to an input signal terminal RSTM through a resistor RT5, and pin 10 is connected to an output signal terminal STAM through a resistor RT 6.
The isolator chip U5 inputs 3.3V voltage through a pin 1, the pin 1 is grounded through a voltage stabilizing capacitor C3, a pin 2 is connected with an input signal terminal PWR PD 04G of the MCU, a pin 3 is connected with an input signal terminal TX PC 104G of the MCU, a pin 4 is connected with an input signal terminal PD 24G of the MCU, a pin 6 is connected with an input signal terminal UART3 RX PC11 of the MCU, and a pin 7 is connected with an input signal terminal LINK PC 124G of the MCU; pin 10 is connected with output signal terminal STAM, pin 11 is connected with output signal terminal TXDM, pin 13 is connected with input signal terminal RSTM, pin 14 is connected with input signal terminal RXDM, pin 15 is connected with output signal terminal SETM, pin 15 inputs +5V voltage and is grounded through voltage stabilizing capacitor C30; the output signal terminal STAM, the output signal terminal TXDM, the input signal terminal RSTM, the input signal terminal RXDM and the output signal terminal SETM are respectively connected with a +5V power supply through 10K omega resistors.
The power supply module converts the input AC220V into low-voltage direct current voltage and provides working power supply for the MCU, the host 4G communication module and the liquid crystal display. The liquid crystal display can display information such as the address of a host computer of the tester, the strength of a 4G signal, the working state and the like. The host 4G communication module is used for carrying out wireless communication between the identification instrument host and the master station server and uploading a result captured by the host and the like to the master station server.
Installing the main machine of the identification instrument near the concentrator or the outgoing line cabinet, and testing the current of the concentrator or the outgoing line cabinet by using a current transformer; voltage signals are collected through a voltage interface of the AC380V, filtered respectively and then provided to the host MCU for operation, and power change of the power grid of the transformer area is monitored in real time. The identification instrument slave machine is arranged near the user meter box, the master station server sends an instruction to the identification instrument slave machine to start triggering, and the identification instrument slave machine generates a specific power pulse waveform after triggering; and meanwhile, the master station server sends an instruction to the identification instrument host through the host 4G communication module to prepare for capturing, the identification instrument host identifies according to the characteristic waveform triggered by the slave machine, and the identification result is uploaded to the master station server through the host 4G communication module.
And if the host computer of the identification instrument captures the power pulse waveform triggered by the slave computer, the user meter box where the slave computer is located is under the topological structure of the transformer substation or the outgoing line cabinet corresponding to the host computer of the identification instrument. And if the host computer of the identification instrument does not capture the power pulse waveform triggered by the slave computer, the user meter box where the slave computer is located is not under the topological structure of the transformer substation or the outgoing line cabinet corresponding to the host computer of the identification instrument. The host of the identification instrument is based on a load identification technology, whether the power variation of a concentrator or an outgoing line cabinet meets the specific waveform variation triggered by a slave is collected and tested, whether a meter box where the slave is located is under a station transformer or outgoing line cabinet topological structure corresponding to the host is judged, and the topological relation between the 'station-transformer' and the 'station-line-transformer' in a low-voltage station area can be identified. "Home-variant" refers to the relationship between a user meter box and a low voltage station variant. The 'household-line-transformer' refers to the relationship among a user meter box, an outgoing line cabinet and a low-voltage transformer.
In conclusion, the method and the device can solve the problem that the topological relation of the low-voltage transformer area is not clear, and meet the requirement that an electric power company and a power supply department quickly identify the topological structure of the low-voltage transformer area.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. The utility model provides a low pressure platform district topology quick identification system, includes PDA handheld terminal and main website server, its characterized in that: the low-voltage transformer area topology rapid identification instrument comprises an identification instrument host and an identification instrument slave, wherein the identification instrument host, the identification instrument slave and a PDA handheld terminal are respectively connected with the master station server through a 4G communication module, the identification instrument slave comprises a slave trigger circuit, the slave trigger circuit comprises an MCU pulse control circuit, a triode switch circuit and a solid relay JD1, the trigger signal output end of the MCU pulse control circuit is connected with the weak current end of the solid relay JD1 through the triode switch circuit, and the strong current end of the solid relay JD1 is connected with the AC220V phase voltage of a transformer area to be detected through a load resistor R1.
2. The low-voltage platform zone topology rapid identification system according to claim 1, characterized in that: the triode switch circuit comprises an NPN type triode Q1, a trigger signal output end TR1-PC8 of the MCU pulse control circuit is connected with a base electrode of a triode Q1 through a resistor R36, the base electrode of the triode Q1 is grounded through a resistor R38 and a capacitor C41 which are mutually connected in parallel, an emitting electrode of the triode Q1 is grounded, and a collector electrode of the triode Q1 is connected with a +5V power supply through a resistor R40 and a light emitting diode LED20 which are connected in series; the collector of the triode Q1 is connected with the negative electrode of the weak current end of the solid-state relay JD1, and the positive electrode of the weak current end of the solid-state relay JD1 is connected with the +5V power supply.
3. The low-voltage platform zone topology rapid identification system according to claim 2, characterized in that: the L end of the strong electric end of the solid-state relay JD1 is connected with the zero line of the AC220V through a fuse F2, and the N end of the strong electric end of the solid-state relay JD1 is connected with the live line of the AC220V through a load resistor R1 and a temperature-controlled switch SW1 which are connected in series; the rated voltage of the fuse F2 is 250V, and the fusing current is 3A; temperature controlled switch SW1 is model number KSD-9700.
4. The low-voltage platform zone topology rapid identification system according to claim 3, characterized in that: the model of the triode Q1 is an S8050 triode, the resistance value of the resistor R36 is 1K omega, the resistance value of the resistor R38 is 10K omega, the capacity of the capacitor C41 is 0.1 muF, and the resistance value of the resistor R40 is 1K omega.
5. The low-voltage platform zone topology rapid identification system according to claim 1, characterized in that: the main machine of the recognizer comprises an AC380V voltage interface, a current transformer interface, a voltage acquisition circuit, a voltage filter circuit, a current acquisition circuit, a current filter circuit, a power supply module, a main machine MCU and a main machine 4G communication module, wherein the AC380V voltage interface is connected with the input end of the voltage acquisition circuit, the output end of the voltage acquisition circuit is connected with the input end of the voltage filter circuit, the output end of the voltage filter circuit is connected with the voltage signal input end of the main machine MCU, and the output end of the voltage filter circuit provides power for each unit of the main machine through the power supply module; the input end of the current acquisition circuit is connected with the current transformer interface, the output end of the current acquisition circuit is connected with the input end of the current filter circuit, and the output end of the current filter circuit is connected with the current signal input end of the host MCU; the signal output end of the host MCU is in signal connection with the master station server through the host 4G communication module; and the signal output end of the host MCU is also connected with the liquid crystal display.
6. The low-voltage platform zone topology rapid identification system according to claim 5, characterized in that: the voltage acquisition circuit comprises a transformer PT1, a transformer PT2 and a transformer PT3, wherein a primary winding of the transformer PT1 is connected with A-phase alternating current, a secondary winding of the transformer PT1 is connected with a voltage signal end Ua1, and two ends of the secondary winding are connected with a thermistor RB13 in parallel; the primary winding of the transformer PT2 is connected with B alternating current, the secondary winding of the transformer PT2 is connected with a voltage signal end Ub1, and two ends of the secondary winding are connected with a thermistor RB14 in parallel; the primary winding of the transformer PT3 is connected with C alternating current, the secondary winding of the transformer PT3 is connected with a voltage signal end Uc1, and a thermistor RB15 is connected in parallel with the two ends of the secondary winding.
7. The low-voltage platform zone topology rapid identification system according to claim 6, characterized in that: in the voltage filter circuit, a voltage signal end Ua1 is grounded through a Zener diode T1, a voltage signal end Ub1 is grounded through a Zener diode T2, and a voltage signal end Uc1 is grounded through a Zener diode T3; the voltage signal end Ua1 is connected with the voltage signal end Ua1 'through a resistor R1 and a resistor R20 which are connected in series, the resistor R1 and the resistor R20 are grounded through a filter capacitor C1, and the resistor R20 and the voltage signal end Ua 1' are grounded through a filter capacitor C20; the voltage signal end Ub1 is connected with a voltage signal end Ub1 'through a resistor R2 and a resistor R21 which are connected in series, the resistor R2 and the resistor R21 are grounded through a filter capacitor C2, and the resistor R21 and the voltage signal end Ub 1' are grounded through a filter capacitor C21; the voltage signal end Uc1 is connected with the voltage signal end Uc1 'through a resistor R3 and a resistor R22 which are connected in series, the resistor R3 and the resistor R22 are grounded through a filter capacitor C3, and the resistor R22 and the voltage signal end Uc 1' are grounded through a filter capacitor C22.
8. The low-voltage platform zone topology rapid identification system according to claim 5, characterized in that: the current transformer interfaces are provided with three groups of PBK sockets, wherein two groups of current transformer interfaces are respectively connected with corresponding current transformer adapter boxes (2) through PAG sheath plug connecting wires (1), and each group of current transformer adapter boxes (2) are respectively connected with outlet currents of three pincerlike transformers; in the current filter circuit, each path of current input signal adopts second-order RC filtering.
9. The low-voltage platform zone topology rapid identification system according to claim 7, characterized in that: a PA0 port of the host MCU is connected with the voltage signal end Ua1 ', a PA1 port is connected with the voltage signal end Ub1 ', and a PA2 port is connected with the voltage signal end Uc1 '; and the PA 2-PA 7 port, the PB0 port, the PB1 port, the PC0 port and the PC1 port of the host MCU are respectively connected with the filtered current signal input end.
10. The low-voltage platform zone topology rapid identification system according to claim 5, characterized in that: the host 4G communication module comprises an isolator chip (U5) and a 4G interface (P5), wherein a pin 1 of the 4G interface is connected with a pin 2 and is connected with +12V voltage through an inductor B4, a pin 3 and a pin 4 are connected with a ground GND2 in parallel, a pin 5 is connected with an output signal end TXDM through a resistor RT2, a pin 7 is connected with an output signal end SETM through a resistor RT3, a pin 8 is connected with an input signal end RXDM through a resistor RT4, a pin 9 is connected with an input signal end RSTM through a resistor RT5, and a pin 10 is connected with an output signal end STATM through a resistor RT 6; the isolator chip (U5) inputs 3.3V voltage through a pin 1, the pin 1 is grounded through a voltage stabilizing capacitor C3, a pin 2 is connected with an input signal end PWR PD 04G of the MCU, a pin 3 is connected with an input signal end TX PC 104G of the MCU, a pin 4 is connected with an input signal end PD 24G of the MCU, a pin 6 is connected with an input signal end UART3 RX PC11 of the MCU, and a pin 7 is connected with an input signal end LINK PC 124G of the MCU; pin 10 is connected with output signal terminal STAM, pin 11 is connected with output signal terminal TXDM, pin 13 is connected with input signal terminal RSTM, pin 14 is connected with input signal terminal RXDM, pin 15 is connected with output signal terminal SETM, pin 15 inputs +5V voltage and is grounded through voltage stabilizing capacitor C30; the output signal terminal STAM, the output signal terminal TXDM, the input signal terminal RSTM, the input signal terminal RXDM and the output signal terminal SETM are respectively connected with a +5V power supply through 10K omega resistors.
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