CN111505374A - Two-in-one metering device with mutual inspection and self-diagnosis functions and detection method - Google Patents
Two-in-one metering device with mutual inspection and self-diagnosis functions and detection method Download PDFInfo
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- CN111505374A CN111505374A CN202010354879.5A CN202010354879A CN111505374A CN 111505374 A CN111505374 A CN 111505374A CN 202010354879 A CN202010354879 A CN 202010354879A CN 111505374 A CN111505374 A CN 111505374A
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- metering
- control terminal
- electric energy
- energy meter
- negative control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/068—Arrangements for indicating or signaling faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
The invention discloses a two-in-one metering device with mutual detection and self-diagnosis functions and a detection method, which are applied to an electric energy meter and a negative control terminal, wherein the two-in-one metering device with mutual detection and self-diagnosis functions comprises a power supply wiring terminal, an electric energy meter metering module, an electric energy meter management module, a negative control terminal metering module, a negative control terminal management module and a standard source output device; the electric energy meter and the metering module of the negative control terminal are connected in parallel with the same set of power supply wiring terminal, so that the integrated and modular design is realized, the maintenance cost is saved, the terminal is free from wiring, and the problems of wiring and faults caused by the negative control terminal are reduced; the metering units of the negative control terminal are periodically calibrated, and metering data between the electric energy meter and the negative control terminal are compared with each other, so that the real-time mutual detection and diagnosis functions of the metering errors of the electric energy meter are realized, and the error can be actively reported when the error is out of tolerance, so that the reliability of the product is improved.
Description
Technical Field
The invention relates to the field of electric energy metering, in particular to an electric energy metering device and a detection method.
Background
With the intelligent development of power grids, load management terminals are widely popularized. Referring to fig. 1, the electric energy metering mode of the charging user in the dedicated power supply mode at present adopts an electric energy meter and terminal mode to realize metering and collection. The electric energy meter and the terminal are respectively provided with a metering unit, and RS485 communication is adopted between the electric energy meter and the terminal to realize communication. The equipment has complex wiring and is easy to have abnormal work or communication caused by wrong wiring. Meanwhile, in order to ensure accurate and reliable operation of the electric energy metering device, a standard electric energy calibration instrument is used for regularly carrying out on-site inspection according to the inspection regulation requirement of the electric energy metering device and the type of the electric energy meter in a fixed period, so that a large amount of manpower and material resources are occupied, and the on-site inspection is only carried out in a specified time, so that the operation condition of the electric energy meter cannot be monitored in real time, and the electricity utilization accident is easily caused.
Therefore, in summary, the prior art has the following disadvantages:
(1) the electric energy meter and the load management terminal belong to two devices, so that the cost is high, the size is large, and field wiring is complex and tedious; the device is provided with two independent metering units, when the device is applied on site, a current loop and a voltage loop need to be connected into two independent devices, the communication is realized by adopting RS485, and meanwhile, the device is complicated in connection and is easy to cause abnormal communication or can not work due to wiring errors;
(2) the field calibration work of the electric energy metering device has fixed periodicity, the running condition of the electric energy meter cannot be monitored in real time, and power utilization accidents are easily caused. The electric energy meter and the load management terminal cannot be calibrated mutually, the load control terminal needs to be connected with a wire to acquire and upload data of the electric energy meter, and the functions of nuclear power difference comparison and comparison do not exist.
Disclosure of Invention
The invention provides a two-in-one metering device with mutual detection and self-diagnosis functions and a detection method, which can overcome the defects in the prior art, realize the integrated application of an electric energy meter and a load management terminal, and realize the real-time error monitoring and fault reporting.
The invention provides a two-in-one metering device with mutual inspection and self-diagnosis functions, which is applied to an electric energy meter and a negative control terminal and comprises a power supply wiring terminal, an electric energy meter metering module, an electric energy meter management module, a negative control terminal metering module, a negative control terminal management module and a standard source output device;
the electric energy meter metering module is used for acquiring the metering data of the electric energy meter in real time;
the negative control terminal metering module is used for acquiring the metering data of the negative control terminal in real time;
the electric energy meter metering module and a strong electric signal sampling end of the negative control terminal metering module are connected in parallel to be connected into the power supply wiring terminal;
the electric energy meter management module is connected with the electric energy meter metering module to acquire the metering data of the electric energy meter;
the load control terminal management module is connected with the load control terminal metering module to acquire the load control terminal metering data;
the load control terminal management module is in communication connection with the electric energy meter management module through an SPI bus;
the standard source output device is used for periodically calibrating the metering unit of the load control terminal;
the negative control terminal management module is used for comparing the electric energy meter metering data with the negative control terminal metering data to obtain an error value, comparing the error value with a preset error threshold value and judging whether the error value exceeds the error threshold value.
Preferably, the two-in-one metering device with the mutual inspection and self-diagnosis functions further comprises a terminal remote communication module, and the terminal remote communication module is in communication connection with the load control terminal management module;
the terminal remote communication module is used for remotely communicating with a master station, and when the error value is larger than the error threshold value, the terminal remote communication module reports to the master station.
Preferably, a relay for switching the state of the current loop is arranged between the negative control terminal metering module and the power supply wiring terminal.
Preferably, the two-in-one metering device with the mutual inspection and self-diagnosis functions further comprises a display module, the display module is connected with the negative control terminal management module, and the display module is used for displaying the electric energy meter and the display interface content of the negative control terminal.
Preferably, the metering unit of the negative control terminal comprises a sampling circuit, a metering chip and a peripheral circuit thereof.
Preferably, the two-in-one metering device with the mutual detection and self-diagnosis functions further comprises a terminal downlink communication module, and the terminal downlink communication module is used for being in communication connection with the electric energy meter.
Preferably, the negative control terminal and the electric energy meter are both provided with 485 interfaces, and the negative control terminal and the electric energy meter are connected with the 485 interfaces through 485 buses to carry out wired communication.
Preferably, the negative control terminal and the electric energy meter are communicated through an SPI bus.
The invention also provides a detection method based on the two-in-one metering device with mutual detection and self-diagnosis functions, which is characterized by comprising the following steps of:
carrying out periodic calibration on a metering unit of the load control terminal;
acquiring the metering data of the electric energy meter and the negative control terminal in real time;
comparing the obtained electric energy meter metering data with the negative control terminal metering data to obtain a real-time error value;
and judging whether the real-time error value exceeds a preset error threshold value, and if so, reporting to the main station for fault reminding.
Preferably, the periodic calibration of the metering unit of the negative control terminal is specifically performed by the standard source output device.
According to the technical scheme, the invention has the following advantages:
the invention provides a two-in-one metering device with mutual inspection and self-diagnosis functions, which is characterized in that an electric energy meter and a metering module of a negative control terminal are connected in parallel with a set of power supply wiring terminal, so that an integrated and modular design is realized, the maintenance cost is saved, the terminal is free from wiring, and the wiring and the caused fault problems of the negative control terminal are reduced; the metering unit of the negative control terminal is periodically calibrated, so that the negative control terminal outputs calibrated metering data, and metering data between the electric energy meter and the negative control terminal are compared with each other, thereby realizing real-time mutual detection and diagnosis functions of metering errors of the electric energy meter, actively reporting when the errors are out of tolerance, and improving the reliability of products.
The invention provides another detection method based on a two-in-one metering device with mutual detection and self-diagnosis functions, which has the same beneficial effects with the metering device and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a diagram of a system framework in the prior art of the present invention;
FIG. 2 is a system diagram of a first embodiment of a two-in-one measuring device with mutual inspection and self-diagnosis functions and a method for detecting the same according to the present invention;
fig. 3 is a schematic diagram of a first embodiment and a second embodiment of a two-in-one metering device with mutual inspection and self-diagnosis functions and a detection method according to the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The two-in-one metering device with mutual inspection and self-diagnosis functions provided by the first embodiment of the invention, referring to fig. 2, includes: the system comprises a power supply wiring terminal, an electric energy meter metering module, an electric energy meter management module, a negative control terminal metering module, a negative control terminal management module, a terminal remote communication module, a terminal downlink communication module, a standard source output device and a display module;
the electric energy meter metering module is used for acquiring electric energy meter metering data in real time, and the negative control terminal metering module is used for acquiring negative control terminal metering data in real time;
in this embodiment, the power access terminal is a strong current input terminal, and strong current signal sampling ends of the electric energy meter metering module and the negative control terminal metering module are connected in parallel to a power connection terminal;
it can be understood that, because the two metering modules are respectively provided with the independent metering systems, the interference condition of data acquisition does not exist after the two metering modules are connected in parallel to the power supply wiring terminal.
Furthermore, a relay for switching the state of a current loop is arranged between the negative control terminal metering module and the power supply wiring terminal, so that when the terminal metering unit is calibrated or replaced, the current of a secondary loop of the electric energy metering device does not need to be short-circuited, and the normal work of the electric energy meter metering module is not influenced after the electric energy meter metering device is pulled out;
it should be noted that, in this embodiment, two independent metering modules share one set of power connection terminal, so that current is connected in series to a circuit, and if a conventional connection terminal is directly pulled out, an open circuit condition exists in a current loop, which affects normal operation of the metering module of the electric energy meter. The present embodiment overcomes this drawback by using a relay.
The electric energy meter management module is connected with the electric energy meter metering module and is used for managing information such as storage, clocks and the like of the electric energy meter by receiving electric energy meter data collected by the electric energy meter metering module;
the load control terminal management module is connected with the load control terminal metering module and is used for managing information such as storage, clocks and the like of the load control terminal by receiving load control terminal data collected by the load control terminal metering module;
the load control terminal management module and the electric energy meter management module realize data interaction through an SPI bus, so that the load control terminal management module respectively acquires metering data in the electric energy meter and the load control terminal;
the negative control terminal management module is connected with the display module and is used for controlling the display module to respectively display the electric energy meter and the display interface content of the negative control terminal;
it should be noted that the display interface content of the electric energy meter includes: current electric quantity, duration electric quantity, variable data, rate electricity price, basic parameters, alarm state and the like;
the display interface content of the terminal comprises: real-time data, parameter setting values, control states, electric energy indicating numbers, Chinese information, electricity purchasing information, terminal information and the like.
And the terminal remote communication module is connected with the load control terminal management module and is used for remotely communicating with the master station.
In this embodiment, the negative control terminal management module can realize the abnormal self-diagnosis of the electric energy meter and the negative control terminal;
referring to fig. 3, the self-diagnosis function is specifically that the standard source output device mutually uses the electric energy meter and the metering unit part of the negative control terminal as a standard meter, and is used for periodically calibrating the metering unit of the negative control terminal, and the metering data output by the negative control terminal is output after calibration, so that the metering data acquired by the metering module of the negative control terminal has a reference property, and the management module of the negative control terminal obtains the calibrated metering data of the negative control terminal;
the metering unit of the negative control terminal comprises a sampling circuit (mainly comprising a voltage sampling circuit and a current sampling circuit), a metering chip and a peripheral circuit for metering; the metering unit of the negative control terminal can be provided with a metering MCU module, the metering unit of the negative control terminal can be independently calibrated and stored, and the metering unit of the negative control terminal is communicated with the negative control terminal management module through an SPI bus through the metering MCU module.
It should be noted that the standard source output device in the present embodiment is a conventional device, which has a periodic calibration requirement, and has a reference output data because of having a country approved measurement unit to perform periodic calibration. If three-phase standard power electric energy meter, the range is: voltage: 3 x (57.7-480) V; current 3 x (5 mA-100A); accuracy: grade 0.01.
The negative control terminal management module and the electric energy meter management module realize data interaction through the SPI bus, so that the negative control terminal management module can acquire the metering data of the electric energy meter and compare the metering data of the electric energy meter with the metering data of the negative control terminal, and the metering data of the negative control terminal is calibrated and output data with reference, so that a real-time error value can be acquired;
if the error threshold value is preset in the negative control terminal management module, the negative control terminal management module can judge whether the error is out of tolerance;
when the error value obtained in real time is larger than the error threshold value, the load control terminal management module reports the abnormal metering data to the master station through the terminal remote communication module for fault reminding;
and when the error value obtained in real time is smaller than the error threshold value, the mutual comparison work of the metering data is repeatedly carried out.
In this embodiment, real-time errors are compared to determine whether an out-of-tolerance condition exists, and once an abnormal condition occurs, the abnormal condition is actively reported to the master station, so that the real-time performance is achieved.
Further, the terminal downlink communication module is used for being in communication connection with the electric energy meter, specifically, the negative control terminal has a downlink communication function (namely a meter reading function), in this embodiment, there are two communication modes, one is that the negative control terminal and the electric energy meter are both provided with 485 interfaces, and when meter reading is performed, the electric energy meter and the negative control terminal are connected with the 485 interfaces at two ends through a 485 bus for wired communication; and secondly, the negative control terminal is communicated with the electric energy meter through an internal SPI bus, and data interaction is realized.
The wired communication can be realized by the reserved interface to support two modes of communication, and simultaneously, the wired communication with other independent electric energy meters on site is also supported.
Example two
The second embodiment provides a method for detecting a fault of metering data based on the first embodiment, and referring to fig. 3, the method includes the following steps:
carrying out periodic calibration on a metering unit of the negative control terminal, so that the negative control terminal outputs calibrated metering data;
acquiring the metering data of the electric energy meter and the negative control terminal in real time;
comparing the obtained electric energy meter metering data with the metering data of the load control terminal to obtain a real-time error value;
and judging whether the real-time error value exceeds a preset error threshold value, and if so, reporting to the main station for fault reminding.
Further, the periodic calibration of the metering unit of the negative control terminal is specifically performed by the standard source output device on the metering unit of the negative control terminal.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A two-in-one metering device with mutual inspection and self-diagnosis functions is applied to an electric energy meter and a negative control terminal and is characterized by comprising a power supply wiring terminal, an electric energy meter metering module, an electric energy meter management module, a negative control terminal metering module, a negative control terminal management module and a standard source output device;
the electric energy meter metering module is used for acquiring the metering data of the electric energy meter in real time;
the negative control terminal metering module is used for acquiring the metering data of the negative control terminal in real time;
the electric energy meter metering module and a strong electric signal sampling end of the negative control terminal metering module are connected in parallel to be connected into the power supply wiring terminal;
the electric energy meter management module is connected with the electric energy meter metering module to acquire the metering data of the electric energy meter;
the load control terminal management module is connected with the load control terminal metering module to acquire the load control terminal metering data;
the load control terminal management module is in communication connection with the electric energy meter management module through an SPI bus;
the standard source output device is used for periodically calibrating the metering unit of the load control terminal;
the negative control terminal management module is used for comparing the electric energy meter metering data with the negative control terminal metering data to obtain an error value, comparing the error value with a preset error threshold value and judging whether the error value exceeds the error threshold value.
2. The two-in-one metering device with the mutual inspection and self-diagnosis functions as claimed in claim 1, further comprising a terminal remote communication module, wherein the terminal remote communication module is in communication connection with the load control terminal management module;
the terminal remote communication module is used for remotely communicating with a master station, and when the error value is larger than the error threshold value, the terminal remote communication module reports to the master station.
3. The two-in-one metering device with the mutual inspection and self-diagnosis functions as claimed in claim 1, wherein a relay for switching the state of a current loop is arranged between the negative control terminal metering module and the power supply wiring terminal.
4. The two-in-one metering device with the mutual inspection and self-diagnosis functions according to claim 1, further comprising a display module, wherein the display module is connected with the negative control terminal management module, and the display module is used for displaying the display interface contents of the electric energy meter and the negative control terminal.
5. The two-in-one metering device with the mutual inspection and self-diagnosis functions as claimed in claim 1, wherein the metering unit of the negative control terminal comprises a sampling circuit, a metering chip and peripheral circuits thereof.
6. The two-in-one metering device with the mutual inspection and self-diagnosis functions according to claim 1, further comprising a terminal downlink communication module, wherein the terminal downlink communication module is used for being in communication connection with the electric energy meter.
7. The two-in-one metering device with the mutual inspection and self-diagnosis functions as claimed in claim 6, wherein the load control terminal and the electric energy meter are respectively provided with a 485 interface, and the load control terminal and the electric energy meter are connected with the 485 interface through a 485 bus to carry out wired communication.
8. The two-in-one metering device with the mutual inspection and self-diagnosis functions as claimed in claim 7, wherein the negative control terminal and the electric energy meter are communicated through an SPI bus.
9. A detection method based on the two-in-one metering device with mutual detection and self-diagnosis functions as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
carrying out periodic calibration on a metering unit of the load control terminal;
acquiring the metering data of the electric energy meter and the negative control terminal in real time;
comparing the obtained electric energy meter metering data with the negative control terminal metering data to obtain a real-time error value;
and judging whether the real-time error value exceeds a preset error threshold value, and if so, reporting to the main station for fault reminding.
10. The detection method according to claim 9, wherein the periodic calibration of the metering unit of the negative control terminal is specifically performed by a standard source output device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010354879.5A CN111505374A (en) | 2020-04-29 | 2020-04-29 | Two-in-one metering device with mutual inspection and self-diagnosis functions and detection method |
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| CN202010354879.5A CN111505374A (en) | 2020-04-29 | 2020-04-29 | Two-in-one metering device with mutual inspection and self-diagnosis functions and detection method |
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Application publication date: 20200807 |