CN213181812U - 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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- CN213181812U CN213181812U CN202021524715.4U CN202021524715U CN213181812U CN 213181812 U CN213181812 U CN 213181812U CN 202021524715 U CN202021524715 U CN 202021524715U CN 213181812 U CN213181812 U CN 213181812U
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Abstract
The utility model relates to a low pressure platform district branch monitoring system and monitoring devices. 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. The utility model discloses an it adopts metering module to hand over control module communication module's cooperation is used, uses current metering method can obtain complete electric energy data and electric energy quality data, equipment running state information on the branch circuit.
Description
Technical Field
The utility model relates to an electric power distribution list net branch road power consumption information monitoring field especially relates to a low pressure platform district branch monitoring system and monitoring devices.
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 monitor terminal, including main part and current terminal chock, settle 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 links up in main multi-purpose groove head machine tooth screw inboard has the current terminal, 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 auxiliary terminal, the current terminal chock is located the rear end in main part middle section, red auxiliary terminal/connecting wire 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.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned deficiencies of the prior art, the present invention is directed to
The utility model provides a low pressure platform district branch monitoring system and monitoring devices, can be when guaranteeing less volume, can gather, handle and store low pressure platform district distribution system's main loop, the three-phase voltage and the multichannel electric current data of branch's return circuit simultaneously.
In order to achieve the purpose, the utility model adopts the following technical proposal:
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; 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 memory chip, the reset circuit, the hardware watchdog and the clock circuit are respectively connected with the main control unit.
Preferably, in the low-voltage distribution room branch monitoring system, the power module includes a full-bridge rectifier, a power inverter, a high-frequency transformer, and a dc regulator 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 indicating lamp, the remote signaling 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; and the binding post and the terminal strip are respectively connected with corresponding module circuits 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 utility model provides a pair of low pressure platform district branch monitoring system and monitoring devices has following beneficial effect:
1) the utility model discloses a hand over adopt metering module, control module, communication module's cooperation is used, uses current metering method can obtain complete electric energy data and electric energy quality data, the equipment running state information on the branch circuit, can gather the electric energy data of terminal load simultaneously, through cooperating with the intelligent platform district distribution transform terminal and the main website of last level, can realize functions such as platform district topology automatic generation, platform district load automatic identification, line loss calculation of whole low-voltage platform district;
2) the utility model discloses an install the external CT of three-phase outside branch monitoring devices, improve power module simultaneously, make the power module volume greatly reduce, guarantee that branch monitoring system is succinct, branch monitoring devices is small, especially adapted installs the terminal environment of platform district distribution such as little feeder pillar in space, ammeter case for the terminal a plurality of return circuits of low pressure platform district distribution system and the data acquisition and the monitoring of load.
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 structural side view of the branch monitoring device provided by the present invention;
fig. 5 is a bottom structure wiring diagram of the branch monitoring device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
Referring to fig. 1-3, the present invention provides a branch monitoring system for a low-voltage transformer area, which includes an alternating current 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, and 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 which model is FM33a 048; the number of the three-phase detection units is set according to field requirements, and the number of the lines connected with the lower part of 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 transformers is large, if the current transformers are 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 the same as the three-phase external CT424 and is externally arranged outside the device, 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.
The utility model discloses a can be applicable to the monitoring system along separate routes of low-voltage transformer district branch monitoring, can be to low-voltage transformer district distribution system's major loop, the three-phase voltage and the multichannel current data of branch return circuit gather simultaneously, handle and store, through inside calculation, obtain complete electric energy data and electric energy quality data on the branch circuit, equipment running state information, the electric energy data of terminal load can be gathered simultaneously, all data can be inside gathering at the terminal, calculate, the analysis, the storage, the terminal supports the power failure incident and reports, through the cooperation with the intelligent transformer district distribution terminal and the main website of last one-level, can realize the transformer district topology automatic generation in whole low-voltage transformer district, transformer district load automatic identification, the line loss calculation function. Above corresponding calculation all adopts the technique commonly used in the field, the utility model discloses do not do the injecing, simultaneously, to the acquirement and the processing of above each item data, all adopt the utility model provides an each module cooperation is realized.
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 memory chip, 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 voltage 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 carry out the conversion of voltage through normal alternating current transformer, then the volume of transformer is too high, and unable adaptation branch monitor terminal reduces the demand of volume, consequently, adopts the utility model discloses a power module 3 can realize obtaining low voltage direct current with alternating voltage conversion, can also guarantee greatly to reduce the volume simultaneously. Further, a 220V input to a double DC (direct current) 12V output circuit is realized. Of course, it should be noted that the power module 3 provided by the present invention further includes 1 TPS54339DDAR power chip and its auxiliary circuit (capable of converting DC12V into DC5V), 1 MIC29152 power chip and its auxiliary circuit (capable of converting DC12V into DC5V), and 1 ZY0505HS-2W isolated power chip and its auxiliary circuit (capable of converting DC5V into DC3.3V) in order to meet the voltage requirements of different chips.
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 is a common architecture mode in the field, which is not limited by the present 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 signaling 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, the utility model discloses do not limit; 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. 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 panel; 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 hermetically buckled with the lower cover 6; 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 circuits 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 collection metering module 4 adopts a single metering controller 41+ metering chip 421 framework, 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 resistor current-limiting circuit and a sampling resistor conversion circuit (three circuits are all circuit designs commonly used in the field, the utility model discloses do not limit the scope), and enters the metering chip 421 in the three-phase detection unit of the circuit, and 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 net mouth type 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, 250A 1: 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 electric 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 module, a DC-DC power 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, and the requirements of the electrical clearance and the creepage distance of strong and weak current are considered, the insulation 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 communicated with the intelligent station area terminal in an uplink mode through the serial ports, and completes external remote signaling input, remote control output and other work through the IO port. 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 current interface adopts 2 x 6Pin socket to connect with up-line communication module weak current interface, up-line communication module strong and weak current interface adopts the type specification 3 part satisfying QGDW 1375.3-2013 power user power consumption information acquisition system: 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.
To sum up, the utility model provides a low pressure platform district branch monitor terminal, the volume is less, and especially adapted installs the terminal environment of platform district distribution such as little feeder pillar in space, ammeter case, can be used for the data acquisition and the monitoring of a plurality of return circuits and load that low pressure platform district distribution system is terminal simultaneously.
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 equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the 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 memory chip, 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 5, 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.
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| CN202021524715.4U CN213181812U (en) | 2020-07-28 | 2020-07-28 | Low-voltage transformer area branch monitoring system and monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406414A (en) * | 2021-06-07 | 2021-09-17 | 云南电网有限责任公司 | Low-voltage transformer area shunt monitoring device and wave recording and fault studying and judging method thereof |
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2020
- 2020-07-28 CN CN202021524715.4U patent/CN213181812U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406414A (en) * | 2021-06-07 | 2021-09-17 | 云南电网有限责任公司 | Low-voltage transformer area shunt monitoring device and wave recording and fault studying and judging method thereof |
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