CN111366888A - Intelligent electric energy meter field metering fault rapid detection method and detection device body - Google Patents
Intelligent electric energy meter field metering fault rapid detection method and detection device body Download PDFInfo
- Publication number
- CN111366888A CN111366888A CN202010171981.1A CN202010171981A CN111366888A CN 111366888 A CN111366888 A CN 111366888A CN 202010171981 A CN202010171981 A CN 202010171981A CN 111366888 A CN111366888 A CN 111366888A
- Authority
- CN
- China
- Prior art keywords
- detection device
- device body
- electric energy
- mcu
- energy meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
-
- 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
- G01R11/25—Arrangements for indicating or signalling faults
-
- 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
- G01R11/48—Meters specially adapted for measuring real or reactive components; Meters specially adapted for measuring apparent energy
- G01R11/54—Meters specially adapted for measuring real or reactive components; Meters specially adapted for measuring apparent energy for measuring simultaneously at least two of the following three variables: real component, reactive component, apparent energy
-
- 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
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a rapid detection device body for field metering faults of an intelligent electric energy meter, which comprises a detection device body, a display screen and an MCU (microprogrammed control unit), wherein the display screen is arranged on the surface of the detection device body, the MCU is arranged in the detection device body, keys are arranged below the surface of the detection device body, crocodile clips which are distributed at equal intervals are arranged at the lower end of the surface of the detection device body, a power module, a metering chip and the MCU are arranged in the detection device body, the power output end of the power module is respectively connected with the power input ends of the metering chip, the display screen and the MCU, and the signal end of the MCU is respectively connected with the signal ends of the metering chip and the crocodile; and the signal access end and the signal output end of the MCU are connected with the keys and the display screen. The invention can timely and safely detect whether the running state of the electric energy meter is normal or not under the condition of not disturbing residents and not influencing the normal electricity consumption of residents, and has the characteristics of convenient carrying, simple and safe operation, accurate and reliable detection and the like.
Description
Technical Field
The invention relates to the technical field of intelligent electric energy meters, in particular to a method and a device body for rapidly detecting field metering faults of an intelligent electric energy meter.
Background
Along with the continuous development of science and technology and the improvement of people's standard of living, more and more electrical equipment lets people experience convenient. But a few power users are driven by benefits, various illegal means are adopted to implement electricity stealing, so that a large amount of national electric energy is lost, and the loss is staggering; the electricity stealing behavior not only seriously damages the legal rights of power supply enterprises, disturbs the normal power supply and utilization order, hinders the healthy development of electric power utilities, but also brings serious threats to the safety of a power grid, and in addition, the metering accuracy of the field operation of the electric energy meter also concerns the vital interests of users and electric power departments.
In summary, under the circumstances, a method and a device body for rapidly detecting field metering faults of an intelligent electric energy meter are urgently needed, which can rapidly and accurately judge whether the metering of the electric energy meter is accurate while ensuring the safety of a power grid and maintaining normal power supply and utilization order of society, and can effectively prevent and attack electric larceny behaviors.
Disclosure of Invention
The invention aims to provide a method and a device body for rapidly detecting field metering faults of an intelligent electric energy meter, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an intelligent ammeter field measurement trouble short-term test device body, includes detection device body, display screen and MCU, detection device body surface is provided with the display screen, the inside MCU that is provided with of detection device body.
Preferably, the keys distributed in a rectangular array are arranged below the surface of the detection device body, and the crocodile clips distributed at equal intervals are mounted at the lower end of the surface of the detection device body.
Preferably, a power module, a metering chip and an MCU are arranged in the detection device body;
the power supply output end of the power supply module is respectively connected with the power supply input ends of the metering chip, the display screen and the MCU;
the signal end of the MCU is respectively connected with the signal ends of the metering chip and the alligator clip; and the signal access end and the signal output end of the MCU are respectively connected with the key and the display screen.
A method for rapidly detecting field metering faults of an intelligent electric energy meter comprises the following steps:
the first step is as follows: the crocodile clip is manually clamped on a screw of a wiring terminal of the electric energy meter through an operator;
the second step is that: the operator presses a key on the surface of the detection device body for five seconds for starting the detection equipment and switching the two specifications of 1A and 5A according to the detection requirement;
the third step: the detection device body starts to work, the power supply module and the virtual load are special transformers, the current, the voltage and the power of the electric energy meter are sampled, sampled data are processed by the metering chip and the MCU and then are transmitted to the display screen, and the real-time voltage, the current and the power displayed on the display screen are compared with the data of the electric energy meter to be detected;
the fourth step: after the real-time voltage, current and power displayed on the display screen are compared with the data of the tested electric energy meter, whether the user electric energy meter is accurately measured or not and whether electricity stealing behaviors exist or not can be verified.
Compared with the prior art, the invention has the beneficial effects that: the invention uses the key setting by the operator, the virtual load can switch between 1A and 5A specifications according to the requirement, the work indicator light flickers to express the work, a special high-precision metering chip 8209C is adopted, the display liquid crystal is controlled by a special MCU to display the real-time voltage, current and power, a special transformer is adopted as the working power supply of the detection method and the detection device and the virtual load required by the detection, the key on the detection device body is pressed for 5 seconds, the detection device body starts to work, and the real-time voltage, current and power displayed on the liquid crystal of the detection device body are compared with the data of the detected electric energy meter, so that whether the metering of the user electric meter is accurate or not can be verified, and whether the electricity stealing behavior exists or not. The electric energy meter can timely and safely detect whether the running state of the electric energy meter is normal or not under the condition of not disturbing residents and not influencing the normal electricity consumption of residents, and has the characteristics of convenience in carrying, simplicity and safety in operation, accuracy and reliability in detection and the like. By applying the detection method and the detection device body, the checking efficiency of the metering fault phenomenon of the electric energy meter is improved, the checking time of the meter is shortened by times, and the electricity stealing behavior is effectively prevented and attacked.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic front view of a detecting device according to the present invention;
FIG. 3 is a schematic view of the internal structure of the detecting device body according to the present invention.
In the figure: 1. a detection device body; 2. a display screen; 3. pressing a key; 4. a crocodile clip; 5. a power supply module; 6. a metering chip; 7. and (6) an MCU.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically connected or connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, an embodiment of the present invention includes:
the first embodiment is as follows:
the utility model provides an intelligent ammeter field measurement trouble quick detection device body, including detection device body 1, display screen 2 and MCU7, detection device body surface is provided with display screen 2, the inside MCU7 that is provided with of detection device body, MCU7 is multi-functional, high performance, the special chip of low-power consumption, the inside units such as treater that have integrateed, clock management, power management, automatic temperature compensation RTC, PLL, high frequency RC, LCD liquid crystal drive. The MCU7 is connected with the temperature sensor through an I2C bus. The I2C bus occupies 2 MCU input/output lines, and communication between the two is completely accomplished by software. The address of the temperature sensor can be set by 2 address pins, so that 8 sensors can be connected to one I2C bus at the same time, and to read the content of the sensor measurement value register, the MCU must first transmit the sensor address and the register pointer. The measurement register may be read by the MCU by issuing an enable signal, followed by the sensor address, and then setting the RD/WR pin high.
To read the 16-bit data in the sensor measurement registers, the MCU7 must make two 8-bit data communications with the sensor. When the sensor is powered on to work, the default measurement precision is 9 bits, the resolution is 0.5C/LSB, and the measuring range is-128.5C to 128.5C. The MCU7 reads the sensor measurements and then performs a scaling operation and displays the result on the LCD. The whole treatment process comprises the following steps: and judging the sign of the display result, converting the binary code into a BCD code, and transmitting the data to a related register of the LCD. After the data is processed and the results are displayed, the MCU7 issues a single step command to the sensor. The single step command causes the sensor to initiate a temperature test and then automatically enter a wait mode until the analog to digital conversion is completed. After the MCU7 sends a single step command, it enters LPM3 mode, at this time, the MCU system clock continues working, and generates a timing interrupt to wake up the CPU. The timing can be adjusted in length by programming to suit the needs of a particular application.
The utility model discloses a detection device body 1 is provided with below the surface and is the button 3 that the rectangle array distributes, and detection device body 1 surface lower extreme installs that the equidistance distributes and the position that operating personnel contacted when using has the crocodile of good insulating effect to press from both sides 4, and detection device body 1 presss from both sides 4 centre gripping on the circuit that awaits measuring through the crocodile that self was equipped with, and display screen 2 is high definition LCD liquid crystal for show real-time voltage, electric current and power. 3 alligator clips 4 which are marked on the device and have good insulation effect at the contact part of an operator when in use are sequentially clipped on screws of a wiring terminal of the electric energy meter, a key on the detection device body 1 is pressed for 3 five seconds, the detection device body 1 starts to work, and the user electric meter can be verified whether the metering is accurate or not and whether the electricity stealing behavior exists or not by comparing the real-time voltage, current and power displayed on the liquid crystal of the detection device body 1 with the data of the electric energy meter to be detected, the operator can directly observe through the display screen 2, and the measured value can be intuitively and effectively known;
the 3 positions of button are high performance, long-life special button 3 for start check out test set and carry out the switching of two kinds of specifications of 1A and 5A according to the measuring demand, through the setting of button 3, virtual load can carry out the switching of two kinds of specifications of 1A and 5A according to the demand, and the work is represented in the work pilot lamp scintillation.
The detection device comprises a detection device body, and is characterized in that a power supply module 5, a metering chip 6 and an MCU7 are arranged in the detection device body, an electric energy meter is connected with the detection device body 1 through an alligator clip 4, the detection device body 1 mainly adopts a special metering chip 6, the chip is high-precision 8209C, a display liquid crystal is controlled through a special MCU7, real-time voltage, current and power are displayed, and a special transformer is adopted as a working power supply of the detection method and the detection device body 1 and a virtual load required by detection;
the metering chip 6 is a special chip which can measure active power, reactive power, active electric energy and reactive electric energy, can simultaneously provide two paths of independent active power, effective values, voltage effective values, line frequency and the like, and can realize flexible application schemes. The metering chip 6 adopts RN8209C type, can measure active power, reactive power, active energy and reactive energy, can provide two independent paths of active power, effective value, voltage effective value, line frequency, zero-crossing interruption and the like, and can realize a flexible electricity larceny prevention scheme. Full digital gain, phase and offset corrections are supported. Active electric energy pulse is output from the PF pin, and reactive electric energy pulse/user-defined electric energy pulse frequency is output from the QF pin. A serial interface UART is provided, with a fixed baud rate of 4800, pin reset multiplexed with the UART input pin RX. The internal power supply monitoring circuit can ensure the reliable work of the chip when the power is on and off.
The power module 5 is connected with the metering chip 6, the display screen 2 and the MCU7, the power module 5 and the virtual load part are special transformers, the virtual power source can independently adjust voltage and current signals, the voltage and current frequencies are the same, and the virtual power source can control the phases of the voltage and the current, which is the same as the power consumed by an actual electric appliance.
The power supply output end of the power supply module 5 is respectively connected with the power supply input ends of the metering chip 6, the display screen 2 and the MCU 7;
the signal end of the MCU7 is respectively connected with the signal ends of the metering chip 6 and the alligator clip 4;
the signal input end and the signal output end of the MCU7 are respectively connected with the key 3 and the display screen 2.
Example two:
a method for rapidly detecting field metering faults of an intelligent electric energy meter comprises the following steps:
the first step is as follows: the crocodile clip 4 is manually operated by an operator to be clamped on a screw of a wiring terminal of the electric energy meter, and a circuit is communicated between an electric energy meter terminal and the detection device body 1 through the crocodile clip 4;
the second step is that: an operator presses a key 3 on the surface of the detection device body 1 for five seconds for starting the detection device 1 and switching the specifications of 1A and 5A according to detection requirements; through the setting of the keys 3, the virtual load can be switched between the specifications 1A and 5A according to requirements, the work indicator lamp flickers to indicate work, and an operator can more intuitively know work filling through the indicator lamp, so that the work filling is clearer and clearer;
the third step: the detection device body 1 starts to work, the power supply module 5 and the virtual load are special transformers, the current, the voltage and the power of the electric energy meter are sampled, sampled data are processed by the metering chip 6 and the MCU7, then numerical values are transmitted to the display screen 2, and the real-time voltage, the current and the power displayed on the display screen 2 are compared with the data of the electric energy meter to be detected;
the fourth step: after the real-time voltage, current and power displayed on the display screen 2 are compared with the data of the tested electric energy meter, whether the user electric energy meter is accurately measured or not and whether an electric larceny behavior exists or not can be verified.
The working principle is as follows: in the actual use process, an operator can be connected with an electric energy meter terminal button on a power grid line through an alligator clip 4 on a detection device body 1, the virtual load can be switched between two specifications of 1A and 5A according to requirements through the setting of the operator by using a key 3, a work indicator lamp flickers to indicate work, a special high-precision metering chip 8209C is adopted, a display liquid crystal is controlled by a special MCU to display real-time voltage, current and power, a special transformer is adopted as a working power supply of the detection method and the detection device body 1 and the virtual load required by detection, the key on the detection device body is pressed for 5 seconds, the detection device body 1 starts to work, and whether the metering of the user electric meter is accurate or not can be verified through comparing the real-time voltage, current and power displayed on the liquid crystal of the detection device body 1 with the data of the measured electric energy meter, whether there is electricity stealing behavior. The electric energy meter can timely and safely detect whether the running state of the electric energy meter is normal or not under the condition of not disturbing residents and not influencing the normal electricity consumption of residents, and has the characteristics of convenience in carrying, simplicity and safety in operation, accuracy and reliability in detection and the like. By applying the detection method and the detection device body, the checking efficiency of the metering fault phenomenon of the electric energy meter is improved, the checking time of the meter is shortened by times, and the electricity stealing behavior is effectively prevented and attacked.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. The utility model provides an intelligent ammeter field measurement trouble quick detection device body, includes detection device body (1), display screen (2) and MCU (7), its characterized in that: the surface of the detection device body (1) is provided with a display screen (2), and the MCU (7) is arranged in the detection device body (1).
2. The intelligent electric energy meter field metering fault rapid detection device body as claimed in claim 1, characterized in that: the crocodile detection device is characterized in that keys (3) distributed in a rectangular array are arranged below the surface of the detection device body (1), and crocodile clips (4) distributed at equal intervals are mounted at the lower end of the surface of the detection device body (1).
3. The intelligent electric energy meter field metering fault rapid detection device body as claimed in claim 1, characterized in that: a power supply module (5), a metering chip (6) and an MCU (7) are arranged in the detection device body (1);
the power supply output end of the power supply module (5) is respectively connected with the power supply input ends of the metering chip (6), the display screen (2) and the MCU (7);
the signal end of the MCU (7) is respectively connected with the signal ends of the metering chip (6) and the alligator clip (4); and the signal access end and the signal output end of the MCU (7) are respectively connected with the key (3) and the display screen (2).
4. A method for rapidly detecting field metering faults of an intelligent electric energy meter comprises the following steps:
the first step is as follows: the crocodile clip (4) is manually clamped on a screw of a wiring terminal of the electric energy meter through an operator;
the second step is that: the operator presses a key (3) on the surface of the detection device body (1) for five seconds for starting the detection equipment and switching the specifications of 1A and 5A according to the detection requirement;
the third step: the detection device body (1) starts to work, the power supply module (5) and the virtual load are special transformers, the current, the voltage and the power of the electric energy meter are sampled, sampled data are processed by the metering chip (6) and the MCU (7) and then are transmitted to the display screen (2), and the real-time voltage, the current and the power displayed on the display screen (2) are compared with the data of the electric energy meter to be detected;
the fourth step: after the real-time voltage, current and power displayed on the display screen (2) are compared with the data of the tested electric energy meter, whether the user electric energy meter is accurately measured or not and whether an electric larceny behavior exists or not can be verified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171981.1A CN111366888A (en) | 2020-03-12 | 2020-03-12 | Intelligent electric energy meter field metering fault rapid detection method and detection device body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010171981.1A CN111366888A (en) | 2020-03-12 | 2020-03-12 | Intelligent electric energy meter field metering fault rapid detection method and detection device body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111366888A true CN111366888A (en) | 2020-07-03 |
Family
ID=71208837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010171981.1A Pending CN111366888A (en) | 2020-03-12 | 2020-03-12 | Intelligent electric energy meter field metering fault rapid detection method and detection device body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111366888A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147563A (en) * | 2020-08-27 | 2020-12-29 | 国网山西省电力公司阳泉供电公司 | Fault electric meter tester |
| CN114910821A (en) * | 2021-02-07 | 2022-08-16 | 中通服节能技术服务有限公司 | AC virtual load tester for power distribution product |
| CN114994590A (en) * | 2022-06-13 | 2022-09-02 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter with metering self-checking function and self-checking method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2938136Y (en) * | 2006-08-29 | 2007-08-22 | 宋国元 | Electric energy field detector with virtual loading |
| CN106093841A (en) * | 2016-08-25 | 2016-11-09 | 海盐星创电子有限公司 | A kind of hand-held electric energy meter on-site calibrator |
-
2020
- 2020-03-12 CN CN202010171981.1A patent/CN111366888A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2938136Y (en) * | 2006-08-29 | 2007-08-22 | 宋国元 | Electric energy field detector with virtual loading |
| CN106093841A (en) * | 2016-08-25 | 2016-11-09 | 海盐星创电子有限公司 | A kind of hand-held electric energy meter on-site calibrator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147563A (en) * | 2020-08-27 | 2020-12-29 | 国网山西省电力公司阳泉供电公司 | Fault electric meter tester |
| CN114910821A (en) * | 2021-02-07 | 2022-08-16 | 中通服节能技术服务有限公司 | AC virtual load tester for power distribution product |
| CN114994590A (en) * | 2022-06-13 | 2022-09-02 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter with metering self-checking function and self-checking method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111366888A (en) | Intelligent electric energy meter field metering fault rapid detection method and detection device body | |
| CN211206604U (en) | Mobile electrical equipment on-line monitoring device | |
| CN112540224A (en) | Meter reading machine and detection method of ammeter data | |
| CN211178687U (en) | Sulfur hexafluoride gas weight measuring device in power equipment | |
| CN207703260U (en) | Oxygenerator detector | |
| CN201837606U (en) | Online monitor for dew point and density of sulfur hexafluoride | |
| CN211718384U (en) | Loop resistance tester | |
| CN205157695U (en) | Based on adjustable fault current sensor of low -power consumption definite value | |
| CN103885025A (en) | Load contrastive analysis tester | |
| CN216246467U (en) | Handheld sensor diagnostic tester | |
| CN203930036U (en) | A kind of three-phase overvoltage protector revise instrument | |
| CN214374942U (en) | Isolated single-phase electric energy measuring ammeter device | |
| CN104914363A (en) | Zinc oxide lightning arrester live tester and testing method | |
| CN211554130U (en) | Intelligent safety power consumption monitoring device based on NB-IOT | |
| CN201926521U (en) | Portable intelligent temperature tester | |
| CN216434208U (en) | Non-contact high-voltage current transformer testing device | |
| CN205898367U (en) | Circuit breaker vacuum monitor | |
| CN211928019U (en) | Practical relay power tester | |
| CN218213189U (en) | Electric energy meter circuit convenient for measuring battery life | |
| CN203811796U (en) | Load contrast analysis tester | |
| CN203519720U (en) | Energy-saving type infrared induction intelligent distribution instrument | |
| CN213457139U (en) | Portable low-voltage detection device | |
| CN2590302Y (en) | Mobile phone | |
| CN209858679U (en) | Electric energy meter capable of detecting fault | |
| CN214503867U (en) | Polarity tester with high stability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200703 |