CN112345840A - Low-voltage transformer area branch monitoring system and monitoring device - Google Patents
Low-voltage transformer area branch monitoring system and monitoring device Download PDFInfo
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- CN112345840A CN112345840A CN202010737397.8A CN202010737397A CN112345840A CN 112345840 A CN112345840 A CN 112345840A CN 202010737397 A CN202010737397 A CN 202010737397A CN 112345840 A CN112345840 A CN 112345840A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
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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
- 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
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Abstract
The invention relates to a low-voltage transformer area branch monitoring system and a monitoring device. A low-voltage transformer area branch monitoring system comprises an alternate mining metering module, a control module, a communication module and a power supply module; the alternating current mining metering module, the communication module and the power supply module are respectively connected with the control module; the alternating current mining metering module comprises a plurality of paths of three-phase detection units and a metering controller, and the plurality of paths of three-phase detection units are respectively connected with the metering controller; the metering controller is connected with the control module; the three-phase detection unit comprises a metering chip, a three-phase voltage sampling circuit, a three-phase current sampling circuit, a three-phase external CT and a zero-sequence current sampling circuit. According to the invention, through the matched use of the alternate collection metering module, the control module and the communication module, complete electric energy data and electric energy quality data on a branch line and equipment running state information can be obtained by using the existing metering method.
Description
Technical Field
The invention relates to the field of power information monitoring of branches of a power distribution single network, in particular to a branch monitoring system and a branch monitoring device for a low-voltage distribution area.
Background
With the increasingly strict requirements of the national power grid company on the fine management of the panoramic perception of the low-voltage power distribution network and the comprehensive improvement of the low-voltage distribution network management required by the power grid company, branch power utilization information acquisition and monitoring and event record reporting are additionally arranged in the branch side of the existing distribution network, so that the full recognition and full penetration of the power utilization information and line loss analysis of the variable-line-branch-meter box-household meter are realized, and the method is a key development direction of the low-voltage power distribution network at the present stage and in a future period.
At present, node equipment positions mainly installed on a transformer side, a branch side and a meter box side of a three-level structure in an existing transformer area are the transformer side and the meter box side, and the node equipment on the branch side is high in demand and needs to be supplemented urgently. The branch side has a large number of loops and a narrow installation position, so that higher requirements are provided for equipment, namely, multi-path voltage and current equipment needs to be collected simultaneously, and the branch side has the functions of data analysis, storage and event reporting and also has a subordinate meter reading function, and the volume also needs to meet the installation requirements.
Patent document with application number CN201822123406.5 discloses a three-phase branch monitoring terminal, including main part and current terminal chock, settle on the top of main part has heavy current terminal seat, and the right side on main part top installs the test piece, the inside in main part middle section is provided with main multi-purpose groove head machine tooth screw, and just the inboard of main multi-purpose groove head machine tooth screw has linked up current terminal, and the inside arrangement of main part right-hand member has the supplementary multi-purpose groove head machine tooth screw, and the inboard of assisting multi-purpose groove head machine tooth screw installs supplementary terminal, the current terminal chock is located the rear end in main part middle section, red supplementary terminal/connection line is installed to the top on main part left side top. This three-phase branch monitor terminal passes through the electric current of each branch switch of open type current transformer monitoring, and the voltage of each branch switch of direct introduction can monitor the state of each branch switch, measure the power consumption of each switch, and the district identification unit is built-in to the terminal, can realize district topology structure discernment. However, the above problems cannot be solved, and the corresponding requirements cannot be met.
Thus, the existing branch monitoring has shortcomings and needs to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a low-voltage distribution area branch monitoring system and a low-voltage distribution area branch monitoring device, which can acquire, process and store three-phase voltage and multi-path current data of a main loop and a branch loop of a low-voltage distribution area power distribution system simultaneously while ensuring small volume.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-voltage transformer area branch monitoring system comprises an alternate mining metering module, a control module, a communication module and a power supply module; the alternate mining metering module, the communication module and the power supply module are respectively connected with the control module;
the alternating current mining metering module comprises a plurality of paths of three-phase detection units and a metering controller, and the plurality of paths of three-phase detection units are respectively connected with the metering controller; the metering controller is connected with the control module;
the three-phase detection unit comprises a metering chip, a three-phase voltage sampling circuit, a three-phase current sampling circuit, a three-phase external CT and a zero-sequence current sampling circuit; the three-phase current sampling circuit is connected with the three-phase external CT; the three-phase voltage sampling circuit, the three-phase current sampling circuit and the zero-sequence current sampling circuit are respectively connected with the metering chip; the metering chip is connected with the metering controller.
Preferably, in the low-voltage distribution room branch monitoring system, the control module includes a main control unit, a memory chip, a reset circuit, a hardware watchdog and a clock circuit; the storage unit, the reset circuit, the hardware watchdog and the clock circuit are respectively connected with the main control unit.
Preferably, in the low-voltage transformer area branch monitoring system, the power module comprises a full-bridge rectifier, a power inverter, a high-frequency transformer and a direct-current voltage stabilizer which are connected in series; the direct current voltage stabilizer is provided with two direct current output ends which are respectively connected with the main control unit and the hardware watchdog.
Preferably, in the low-voltage distribution room branch monitoring system, the communication module comprises an RS-485 communication unit, an infrared communication unit, a carrier communication unit and a USB communication unit; the RS-485 communication unit, the infrared communication unit, the carrier communication unit and the USB communication unit are respectively connected with the control module.
The preferable low-voltage transformer area branch monitoring system further comprises an auxiliary module which is connected with the control module;
the auxiliary module comprises an indicator light, a remote signaling unit, a pulse output unit and a positioning unit; the indicator light, the remote communication unit, the pulse output unit and the positioning unit are respectively connected with the control module.
Preferably, in the low-voltage distribution room branch monitoring system, the positioning unit is a Beidou navigation module or a GPS navigation module.
A low-voltage transformer area branch monitoring device using the low-voltage transformer area branch monitoring system comprises a metering board, an interface board, a power board, a shell and an external accessory device; the metering plate and the interface board are connected with the socket through pins and are both internally arranged in the shell; the external accessory device is arranged outside the shell and is connected with the interface board through a corresponding line;
the circuit of the alternate mining metering module is arranged on the metering plate; the circuit of the power supply module is arranged on the power supply board; the control module is arranged on the interface board; the communication module is connected with the interface board.
Preferably, the housing of the low-voltage transformer area branch monitoring device comprises an upper cover and a lower cover; the upper cover is hermetically buckled with the lower cover; the surface of the upper cover is provided with an indicator light output hole, a carrier module mounting position, a USB upgrading module mounting position and a communication interface mounting position; the lower cover comprises a wiring terminal and a terminal row; the wiring terminal and the terminal strip are respectively connected with the corresponding module circuit according to functions.
Preferably, the upper cover and the lower cover of the low-pressure distribution area branch monitoring device are made of water-discharge ultraviolet-discharge flame-retardant PC materials.
Preferably, the communication interface of the low-voltage distribution area branch monitoring device comprises a pulse interface, a remote signaling interface and an RS-485 output plug.
Compared with the prior art, the low-voltage transformer area branch monitoring system and the monitoring device provided by the invention have the following beneficial effects:
1) according to the invention, through the matched use of the collection metering module, the control module and the communication module, complete electric energy data and electric energy quality data on a branch line and equipment running state information can be obtained by using the existing metering method, meanwhile, the electric energy data of terminal load can be collected, and through the cooperation with the upper-level intelligent distribution transformer terminal and the main station, the functions of automatic generation of distribution area topology, automatic identification of distribution area load, line loss calculation and the like of the whole low-voltage distribution area can be realized;
2) the three-phase external CT is arranged outside the branch monitoring device, and the power module is improved, so that the volume of the power module is greatly reduced, the branch monitoring system is simple, the size of the branch monitoring device is small, the branch monitoring device is very suitable for being arranged in distribution terminal environments of distribution areas such as branch boxes, electric meter boxes and the like with small space, and the branch monitoring device is used for data acquisition and monitoring of a plurality of loops and loads at the tail end of a distribution system of a low-voltage distribution area.
Drawings
FIG. 1 is a block diagram of a branch monitoring system provided by the present invention;
FIG. 2 is a circuit diagram of the control module provided by the present invention;
FIG. 3 is a circuit diagram of a power module provided by the present invention;
FIG. 4 is a side view of the configuration of a branch monitoring apparatus provided by the present invention;
FIG. 5 is a bottom block diagram of a branch monitoring device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1-3 together, the present invention provides a low-voltage distribution room branch monitoring system, which includes an acquisition metering module 4, a control module 1, a communication module 2 and a power module 3; the alternate mining metering module 4, the communication module 2 and the power supply module 3 are respectively connected with the control module 1;
the alternate mining metering module 4 comprises a plurality of paths of three-phase detection units and a metering controller 41, wherein the plurality of paths of three-phase detection units are respectively connected with the metering controller 41; the metering controller 41 is connected with the control module 1; preferably, the metering controller 41 is an MCU of type FM33a 048; the number of the three-phase detection units is set according to field requirements, and the number of the connecting lines connected with a common branch box is 4, so that the number of the three-phase detection units is 4;
the three-phase detection unit comprises a metering chip 421, a three-phase voltage sampling circuit 422, a three-phase current sampling circuit 423, a three-phase external CT424 and a zero-sequence current sampling circuit 425; the three-phase current sampling circuit 423 is connected with the three-phase external CT 424; the three-phase voltage sampling circuit 422, the three-phase current sampling circuit 423 and the zero-sequence current sampling circuit 425 are respectively connected with the metering chip 421; the metering chip 421 is connected to the metering controller 41. Preferably, the model of the metering chip 421 is HT 7022E; the three-phase voltage sampling circuit 422 comprises three groups of voltage sampling circuits which are respectively used for detecting the voltage of A, B, C three-phase lines in the distribution line, and preferably, each group of voltage sampling circuit is provided with a voltage sensor which is a voltage transformer commonly used in the field; the three-phase external CT424 includes three current transformers, which are respectively used for detecting currents of A, B, C three-phase lines in the distribution line, and because the volume of the current transformer is large, if the current transformer is internally installed in the branch monitoring device, the volume of the device is increased, and the device does not meet the corresponding requirement for reducing the volume; the three-phase current sampling circuit 423 comprises three groups of current sampling circuits which are respectively and correspondingly connected with three current transformers in the three-phase external CT 424; the zero sequence current sampling circuit 425 is provided with a zero sequence current sampling circuit 425, a current transformer for detecting a zero sequence line is also externally arranged outside the device like the three-phase external CT424, and the selection of the specific model is the same as that of the current transformer in the three-phase external CT424, and no special limitation is made.
Specifically, based on the monitoring requirements of a branch box side on a distribution line, the invention designs a shunt monitoring system which can be suitable for branch monitoring of a low-voltage station area, the shunt monitoring system can simultaneously acquire, process and store three-phase voltage and multi-path current data of a main loop and a branch loop of the low-voltage station area distribution system, complete electric energy data and electric energy quality data and equipment running state information on the branch loop are obtained through internal calculation, electric energy data of terminal loads can be acquired, all the data can be gathered, calculated, analyzed and stored in a terminal, the terminal supports power failure event reporting, and the functions of station area topology automatic generation, station area load automatic identification and line loss calculation of the whole low-voltage station area can be realized through cooperation with an intelligent station area distribution transformer terminal and a main station of the previous stage. The corresponding calculation adopts the common technology in the field, the invention is not limited, and meanwhile, the acquisition and the processing of the data are realized by adopting the matching of all the modules in the invention.
Preferably, in this embodiment, the control module 1 includes a main control unit U1, a memory chip (not shown), a reset circuit (not shown), a hardware watchdog (not shown), and a clock circuit (not shown); the storage unit, the reset circuit, the hardware watchdog and the clock circuit are respectively connected with the main control unit U1. Preferably, the control unit is an MCU, and further preferably, the model is R5F 51138; the storage chip adopts 1 FLASH of 32MBIT to store data; adopting MAX706 to form a reset circuit; the clock circuit adopts an 8025 clock chip to generate a real-time clock; the main control unit U1 communicates with the metering controller 41 through the SPI to receive the data of the collection and delivery metering; the hardware watchdog is used for monitoring whether all hardware devices in the system are normal in real time, is a common technical means in the field, and is not particularly limited.
Preferably, in this embodiment, the power module 3 includes a full bridge rectifier BR7, a power inverter U5, a high frequency transformer T2, and a dc regulator (not shown) connected in series; the direct current voltage stabilizer is provided with two direct current output ends which are respectively connected with the main control unit U1 and the hardware watchdog. Generally, the voltage received by the power module 3 is input into the full-bridge rectifier BR7 to obtain a general high-voltage ac, so that only the power inverter U5 is used to convert the voltage into a high-frequency ac, and then the high-frequency transformer T2 is used to convert the high-frequency ac into a low-voltage ac, and then the dc regulator obtains a low-voltage dc (for example, preferably into a 12V dc in this embodiment); if the voltage is converted by a normal alternating current transformer, the size of the transformer is too high, and the requirement of reducing the size of the branch monitoring terminal cannot be met, so that the alternating current voltage can be converted to obtain low-voltage direct current by using the power module 3 provided by the invention, and meanwhile, the extremely small size can be ensured. Further, a 220V input to a double DC (direct current) 12V output circuit is realized. Of course, it should be noted that, in order to meet the voltage requirements of different chips, the power module 3 provided by the present invention further includes 1 TPS54339DDAR power chip and its accessory circuit (capable of converting DC12V into DC5V), 1 MIC29152 power chip and its accessory circuit (capable of converting DC12V into DC5V), and 1 ZY0505HS-2W isolated power chip and its accessory circuit (capable of converting DC5V into DC3.3V).
As a preferred scheme, in this embodiment, the communication module 2 includes an RS-485 communication unit, an infrared communication unit, a carrier communication unit, and a USB communication unit; the RS-485 communication unit, the infrared communication unit, the carrier communication unit and the USB communication unit are respectively connected with the control module 1. Preferably, the RS-485 communication unit forms a 2-way RS-485 communication circuit by 2 AZRSRS-485 chips and an optocoupler, and the corresponding architecture composition is a common architecture mode in the field, which is not limited in the invention; the infrared communication unit is provided with an HM338R infrared communication chip and a triode switch, and the specific use is not particularly limited; the carrier communication unit is an external carrier communication module 2; the USB communication unit is provided with a USB interface and is connected with a USB serial port of the control unit. The main control unit U1 is respectively communicated with an external 2-channel RS-485 circuit, an external 1-channel infrared circuit and an external 1-channel carrier circuit through 4-channel serial ports; and the 1-channel USB port is controlled by the I/O port to carry out USB communication with the outside.
Preferably, in this embodiment, the control system further includes an auxiliary module connected to the control module 1;
the auxiliary module comprises an indicator light, a remote signaling unit, a pulse output unit and a positioning unit; the indicator light, the remote communication unit, the pulse output unit and the positioning unit are respectively connected with the control module 1.
As a preferred scheme, in this embodiment, the positioning unit is a beidou navigation module or a GPS navigation module.
Preferably, the indicator lights are LED function indicator lights, the number of the indicator lights is 6, and the indicator lights are respectively used for displaying each function state of the branch monitoring system, specifically set according to requirements, and the invention is not limited; the remote signaling unit comprises a 2-channel remote signaling device; the pulse output unit comprises 4 paths of active electric quantity pulse output devices. And the main control unit U1 controls 6 indicator lamps, the remote signaling state of the 2-path remote signaling device, the 4-path active electric quantity pulse and the 1-path positioning unit through the I/O port. Wherein the main control unit U1 also obtains geographical location information and global clock timing information through the positioning unit (Beidou/GPS navigation module).
Example 2
Referring to fig. 4-5, the present invention further provides a low voltage distribution area branch monitoring device using the low voltage distribution area branch monitoring system, which includes a metering board (not shown), an interface board (not shown), a power board (not shown), a housing and an external accessory device (not shown); the metering plate and the interface board are connected with the socket through pins and are both internally arranged in the shell; the external accessory device is arranged outside the shell and is connected with the interface board through a corresponding line;
the circuit of the alternate mining metering module 4 is arranged on the metering plate; the circuit of the power module 3 is arranged on the power board; the control module 1 is arranged on the interface board; the communication module 2 is connected with the interface board and further connected with the control module 1. The external accessory devices are the three-phase external CT424 and the zero sequence current transformer in embodiment 1, the specific installation positions are not limited, the current transformer is externally arranged, and the size of the branch monitoring device can be reduced.
Preferably, in this embodiment, the housing includes an upper cover 5 and a lower cover 6; the upper cover 5 is buckled with the lower cover 6 in a sealing way; the surface of the upper cover 5 is provided with an indicator light output hole, a carrier module mounting position, a USB upgrading module mounting position and a communication interface mounting position; the lower cover 6 comprises binding posts 51-54 and terminal rows 55-59; the terminals 51 to 54 and the terminal strip are respectively connected with corresponding module circuits according to functions. The terminals 51-54 are used for connecting a three-phase distribution line (A, B, C, N) so as to carry out sampling through a three-phase voltage sampling circuit 422; the terminal blocks 55 to 59 are respectively used for connecting the current transformers of the three-phase external CT424 and connecting the current transformers with the corresponding three-phase current sampling circuit 423.
Preferably, in this embodiment, the material of the upper cover 5 and the lower cover 6 is a waterproof, ultraviolet-proof and flame-retardant PC material.
As a preferred scheme, in this embodiment, the communication interface includes a pulse interface, a remote signaling interface, and an RS-485 output plug.
Specifically, the metering plate is mainly provided with a circuit of an alternate mining metering module 4 and a circuit of a power supply module 3. The specific design and implementation functions are as follows; when the metering board is provided with a corresponding circuit, the circuit of the alternate acquisition metering module 4 adopts a single metering controller 41+ metering chip 421 architecture, a voltage signal of an external 3-phase line is detected by a corresponding voltage transformer, and then is converted into a small voltage sampling signal after passing through a piezoresistor protection circuit, a large resistance current limiting circuit and a sampling resistance conversion circuit (the three circuits are all circuit designs commonly used in the field, and the invention is not limited), and then enters the metering chip 421 in the three-phase detection unit of the circuit, wherein the preferred model of the metering chip 421 is HT 7036; meanwhile, the current signals of the external 4 paths of 3-phase lines are converted into small current signals through an external current transformer, converted into small voltage sampling signals through a sampling resistance conversion circuit and then respectively enter the 4 paths of metering chips 421 on the metering control board through a first-order filter circuit; so far, each metering chip 421 introduces 3-phase voltage signal and 3-phase current signal, and can analyze and calculate the electric energy values of voltage, current, active power, reactive power and the like. It should be noted that the current sampling interface in the current sampling circuit adopts a mesh interface to reduce the occupied volume, and the voltage sampling interface adopts a universal 7.62mm connector. The external current transformer needs to adopt IP66 high protection grade, 250A1: 40000.5S grade, and the iron core of the external current transformer adopts permalloy. The 4 measurement chips 421 are respectively connected in parallel to communicate with the control chip FM33a048 of the measurement controller 41 through the 2-way SPI port, that is, the 1-way SPI port is connected in parallel to the 2 measurement chips 421, so that the data volume born by the one-way SPI port is reduced, and the transmission of the sampling data and the interaction of the control command are completed. An FFT (Fourier transform) algorithm is built in a control chip FM33A048 of the metering controller 41, so that the measurement and analysis work of basic electrical parameters, harmonic waves, flicker and the like is completed, and data statistics and storage are completed. The metering controller 41 uploads the electricity utilization information acquisition data of 4 loops through the communication between the serial port and the MCU R5F51138 of the main control unit U1 of the control module 1.
The input voltage AC220V, power 15w, and output isolated DC12V and DC5V of the power module 3 on the power panel are responsible for supplying power to the metering panel, the interface board and the communication module 2 of the whole machine system. The power circuit mainly comprises an AC-DC switching power supply module, a DC-DC power supply conversion module, a backup power supply, an alternate acquisition metering module, a topological signal sending module, a zero-crossing detection circuit, a power supply, a signal switching circuit and other unit circuits. Furthermore, the power supply on the metering plate adopts three-phase power supply, the size of the power supply plate is small, and more functional circuits are needed to be completed, so that the AC-DC switching power supply is made into an independent module according to the modular design, the requirements of strong and weak electric gaps and creepage distance are considered, an insulating sheet is adopted between the bottom of the power supply module 3 and the power supply plate for insulation treatment, and the smaller the required size of the AC-DC switching power supply is, the better the requirement is.
The metering board is connected with the interface board through a 2 x 15Pin socket with the distance of 2.54mm and a two-core cable, the 2 x 15Pin socket is mainly used for providing a main system power supply and connecting communication control signals, and the two-core cable is used for connecting live wire and zero wire signals of the power board to a 2 strong electric interface of the uplink communication module. The terminal row strong current three-phase alternating current voltage and the three-phase alternating current signal are connected with the metering plate through cables. The terminal row remote signaling terminal is connected with the interface board through a cable. The weak current terminals of the uplink communication module 2 and the spare communication module 2 are connected with the interface board through 2 x 6Pin Pin sockets with the distance of 2.54 mm.
The interface board is mainly provided with a control module 1 circuit, a communication module 2 circuit and an auxiliary module circuit. The line monitoring terminals are divided according to functions and need to have the main functions of station area topology identification, loop impedance analysis, data acquisition management and storage, fine line loss analysis, event reporting, uplink communication, downlink communication, alternate collection, power supply sensing module expansion and the like. The interface board comprises a main control unit U1, an uplink communication module interface, a standby communication module interface, an infrared communication unit, a 4-channel RS-485 communication unit, a 1-channel remote signaling input unit, an RTC clock, a local LED state indication and other unit circuits.
A single chip machine R5F51138 in a main control unit U1 in a control module 1 on an interface board is responsible for external control and communication, and the main control unit U1 has 8 serial ports which are distributed to measure 1, carrier plus micropower 2, infrared 1, RS-4852 and GPS reserved 1. The intelligent station area terminal is communicated with the uplink broadband carrier module and the micropower wireless module through serial ports, is in uplink communication with the intelligent station area terminal through the serial ports, and completes external remote signaling input, remote control output and other work through IO ports. The serial port is converted into an RS-485 port to communicate with the outside, the I2C port and an external real-time clock are used for communicating, the time of the year, the month and the day can be set, and an indicator lamp is driven by an IO port to display running, alarming and data communication information.
The interface board up-line communication module strong and weak electric interface adopts 2 x 6Pin socket to connect with up-line communication module weak electric interface, up-line communication module strong and weak electric interface adopts the type specification meeting QGDW 1375.3-2013 power consumer electricity consumption information collection system part 3: the weak electrical interface pin definition of the communication module in section a7.3 and the carrier coupling interface definition of the communication module in section a7.4 in collector type specification are required to meet the weak electrical interface pin definition of the local communication module in section F in local communication module interface protocol (2016) in southern china for power grid metering automation terminal, and because the weak electrical interface pin definitions of the two specifications are inconsistent, a compatible design is required to be made in hardware design. The spare communication module interface of the interface board adopts a 2 multiplied by 6Pin socket design.
The 2 RS-RS-485 interfaces are isolated from the main system by adopting a design scheme of an accelerating circuit commonly used for the terminal, and meet a 380V alternating current overvoltage experiment. The standby communication module is based on terminal maintenance and function expansion consideration, and the interface definition of the standby communication module is designed to be consistent with that of the standby communication module of the existing branch monitoring terminal, mainly as follows: USB upgrading and GPS big dipper bimodulus module, this module can directly use the module that current branch monitor terminal used, can be used to USB upgrading, location and to the time.
The shell unit is as shown in fig. 4-5, and as shown in the figure, the broadband carrier module and the USB upgrading module (which can be replaced by the beidou GPS navigation module) are arranged behind the front face of the front panel baffle. The voltage sampling interface is unchanged (realized by a binding post), the net-port type current sampling interface (namely the terminal strip 55-59) is placed at the right position of the lower cover 6 plate, the RS-485 port and the 12V output adopt the terminal strip with the uniform spacing of 5.08, and the weak current terminal is arranged above the voltage strong current terminal strip. In addition, a panel indicator light and infrared communication are arranged on the front panel. The whole device shell is of a plastic structure, the electrical insulation performance is stronger than that of a product with a metal shell, but the antistatic interference and other EMC performances are weaker than those of the product with the metal shell. The complete machine balances the constraints of function, structure and manufacturability as much as possible.
In summary, the branch monitoring terminal for the low-voltage transformer area provided by the invention is small in size, is very suitable for being installed in the distribution terminal environment of transformer areas such as branch boxes and electricity meter boxes with small space, and can be used for data acquisition and monitoring of a plurality of loops and loads at the tail end of a distribution system of the low-voltage transformer area.
The technical solutions are not described in detail, but are common technical means in the field, and the present invention is not described in detail. It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (10)
1. A low-voltage transformer area branch monitoring system is characterized by comprising an alternate mining metering module, a control module, a communication module and a power supply module; the alternating current mining metering module, the communication module and the power supply module are respectively connected with the control module;
the alternating current mining metering module comprises a plurality of paths of three-phase detection units and a metering controller, and the plurality of paths of three-phase detection units are respectively connected with the metering controller; the metering controller is connected with the control module;
the three-phase detection unit comprises a metering chip, a three-phase voltage sampling circuit, a three-phase current sampling circuit, a three-phase external CT and a zero-sequence current sampling circuit; the three-phase current sampling circuit is connected with the three-phase external CT; the three-phase voltage sampling circuit, the three-phase current sampling circuit and the zero-sequence current sampling circuit are respectively connected with the metering chip; the metering chip is connected with the metering controller.
2. The low-voltage transformer area branch monitoring system of claim 1, wherein the control module comprises a main control unit, a memory chip, a reset circuit, a hardware watchdog and a clock circuit; the storage unit, the reset circuit, the hardware watchdog and the clock circuit are respectively connected with the main control unit.
3. The low-voltage transformer area branch monitoring system according to claim 2, wherein the power supply module comprises a full-bridge rectifier, a power inverter, a high-frequency transformer and a direct-current voltage stabilizer which are connected in series; the direct current voltage stabilizer is provided with two direct current output ends which are respectively connected with the main control unit and the hardware watchdog.
4. The low-voltage transformer area branch monitoring system of claim 1, wherein the communication module comprises an RS-485 communication unit, an infrared communication unit, a carrier communication unit and a USB communication unit; the RS-485 communication unit, the infrared communication unit, the carrier communication unit and the USB communication unit are respectively connected with the control module.
5. The low pressure station area branch monitoring system of claim 1, further comprising an auxiliary module connected to the control module;
the auxiliary module comprises an indicator light, a remote signaling unit, a pulse output unit and a positioning unit; the indicating lamp, the remote signaling unit, the pulse output unit and the positioning unit are respectively connected with the control module.
6. The low-voltage transformer area branch monitoring system of claim 1, wherein the positioning unit is a Beidou navigation module or a GPS navigation module.
7. A low-voltage transformer area branch monitoring device using the low-voltage transformer area branch monitoring system as claimed in any one of claims 1 to 6, which is characterized by comprising a metering board, an interface board, a power board, a shell and an external accessory device; the metering plate and the interface board are connected with the socket through pins and are both internally arranged in the shell; the external accessory device is arranged outside the shell and is connected with the interface board through a corresponding line;
the circuit of the alternate mining metering module is arranged on the metering plate; the circuit of the power supply module is arranged on the power supply board; the control module is arranged on the interface board; the communication module is connected with the interface board.
8. The low pressure bay branch monitoring device of claim 7, wherein the housing comprises an upper cover, a lower cover; the upper cover is hermetically buckled with the lower cover; the surface of the upper cover is provided with an indicator light output hole, a carrier module mounting position, a USB upgrading module mounting position and a communication interface mounting position; the lower cover comprises a wiring terminal and a terminal row; and the binding post and the terminal strip are respectively connected with corresponding module circuits according to functions.
9. The low-voltage transformer area branch monitoring device according to claim 8, wherein the upper cover and the lower cover are made of waterproof, ultraviolet-proof and flame-retardant PC materials.
10. The low voltage transformer area branch monitoring device of claim 8, wherein the communication interface comprises a pulse interface, a remote signaling interface, and an RS-485 output plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737397.8A CN112345840A (en) | 2020-07-28 | 2020-07-28 | Low-voltage transformer area branch monitoring system and monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010737397.8A CN112345840A (en) | 2020-07-28 | 2020-07-28 | Low-voltage transformer area branch monitoring system and monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112345840A true CN112345840A (en) | 2021-02-09 |
Family
ID=74357557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010737397.8A Pending CN112345840A (en) | 2020-07-28 | 2020-07-28 | Low-voltage transformer area branch monitoring system and monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112345840A (en) |
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2020
- 2020-07-28 CN CN202010737397.8A patent/CN112345840A/en active Pending
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