CN113483904A - Terminal temperature monitoring system of single-phase ammeter - Google Patents
Terminal temperature monitoring system of single-phase ammeter Download PDFInfo
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- CN113483904A CN113483904A CN202110831170.4A CN202110831170A CN113483904A CN 113483904 A CN113483904 A CN 113483904A CN 202110831170 A CN202110831170 A CN 202110831170A CN 113483904 A CN113483904 A CN 113483904A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
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- 230000001960 triggered effect Effects 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
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- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
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- 230000003247 decreasing effect Effects 0.000 description 2
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- 101100100146 Candida albicans NTC1 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/25—Arrangements for indicating or signalling faults
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention provides a terminal temperature monitoring system of a single-phase electric meter, which comprises a temperature probe, a temperature acquisition module, an MCU (microprogrammed control unit), the single-phase electric meter and a magnetic latching relay, wherein the temperature probe is connected with the temperature acquisition module; the temperature probe comprises a live wire temperature probe and a zero line temperature probe, the one-way electric meter is provided with a plurality of wiring terminals, and the wiring terminals comprise a live wire wiring terminal and a zero line wiring terminal; the live wire temperature probe is arranged at one end of a live wire connecting terminal of the single-phase electric meter, and the zero line temperature probe is arranged at one end of a zero line outlet terminal of the single-phase electric meter; the temperature probe is connected with the temperature acquisition module, and the temperature acquisition module and the magnetic latching relay are respectively connected with the signal input end and the signal output end of the MCU; through monitoring single-phase ammeter binding post temperature to set for corresponding procedure rule output and report an emergency and ask for help or increased vigilance and tripping control, can promote the safety in utilization of one-way ammeter, be favorable to maintainer to inspect and maintain simultaneously.
Description
Technical Field
The invention relates to the technical field of instrument and meter monitoring, in particular to a terminal temperature monitoring system of a single-phase electric meter.
Background
Currently, single-phase electric meters are mainly classified into two types:
the related standard is set to be too perfect, so that the functions of all the meters are almost the same, and the related standard does not set a terminal for measuring the temperature, so the electric meter does not have the function.
The commercial electric meter is mainly used for commercial metering calculation and is not constrained by national standards, so that the electric meter almost has simple functions and low cost, and no manufacturer invests in developing the functions.
Although the latest multi-core module smart meters have similar functional requirements, the current products do not have the function.
In the prior art, the electric meter is used as an electricity metering device, any load used by a user passes through the electric meter, the load is indefinite, the electric meter belongs to a product without regular maintenance, screws are loosened, a line is aged, terminals are corroded, and a connecting terminal is remoistened in the using process, so that the surface of a copper connecting piece is oxidized, poor contact is caused, the line is possibly heated and even fires are caused, and at the moment, if a certain detection protection measure is not provided, a large accident is possibly caused.
Disclosure of Invention
The invention provides a terminal temperature monitoring system of a single-phase ammeter, aiming at the technical problems in the prior art, and solving the problem that a temperature probe in the prior art cannot meet the requirement of temperature monitoring on an ammeter wiring terminal due to the voltage-resistant level.
The technical scheme for solving the technical problems is as follows: a terminal temperature monitoring system of a single-phase electric meter comprises a temperature probe, a temperature acquisition module, an MCU (microprogrammed control unit), the single-phase electric meter and a magnetic latching relay; the temperature probe comprises a live wire temperature probe and a zero line temperature probe, the one-way electric meter is provided with a plurality of wiring terminals, and the wiring terminals comprise a live wire wiring terminal and a zero line wiring terminal; the live wire temperature probe is arranged at one end of a live wire connecting terminal of the single-phase electric meter, and the zero line temperature probe is arranged at one end of a zero line outlet terminal of the single-phase electric meter; the temperature probe is connected with the temperature acquisition module, and the temperature acquisition module and the magnetic latching relay are respectively connected with the signal input end and the signal output end of the MCU;
the temperature of the measuring sides of the live wire and the zero line of the unidirectional ammeter is acquired through the temperature probe, processed and sent to the MCU through the temperature acquisition module and judged and analyzed with set data, and then output to the magnetic latching relay control circuit state according to the set program.
Preferably, one end of the temperature probe is provided with a resin layer, the resin layer enables one end of the temperature probe to be embedded and sealed on the wiring terminal, and the other end of the temperature probe is provided with a lead connected with the temperature probe; the terminal is equipped with the insulating gum cover in the resin layer tip, insulating gum cover and the outside parcel of resin layer are equipped with the terminal gum cover of colding pressing, the terminal gum cover of colding pressing will resin layer and insulating adhesive tape are fixed on the binding post.
Preferably, the material used for the resin layer is epoxy resin.
Preferably, when the temperature value acquired by the temperature probe is higher than the upper limit of the normal temperature or lower than the lower limit of the normal temperature, the temperature is judged to be abnormal, the overtemperature alarm or trip function is turned off at the moment, and whether the magnetic latching relay is overloaded or not is judged according to the acquired current incoming line.
Preferably, when the temperature value acquired by the temperature probe is lower than the upper limit of the normal temperature and reaches the alarm temperature, or the temperature value acquired by the temperature probe is higher than the lower limit of the normal temperature and reaches the alarm temperature, the alarm or trip function is triggered.
Preferably, the set alarm temperature is different from the trip temperature, and the alarm temperature is lower than the trip temperature, and when the temperature slowly rises, the alarm is triggered first and then the trip is triggered.
Preferably, when the temperature rises sharply and is directly higher than the trip limit value in a short time, the alarm is still given, but the trip delay is lengthened, the delay time is inversely proportional to the current temperature overrun range, the time is shorter as the temperature is higher, the shortest time is 30 seconds, and the longest time is 5 minutes.
Preferably, during the timing before tripping, if the temperature is in a downward trend, the timing is decreased, if the upward trend is generated again, the timing is increased until the temperature is lower than the tripping limit value, or the timing is tripped after reaching.
Preferably, the MCU is connected with a background system and a display screen, and the background system is connected with a mobile terminal.
The invention has the beneficial effects that: the invention provides a terminal temperature monitoring system of a single-phase ammeter, which solves the problem that a temperature probe in the prior art cannot meet the requirement of temperature monitoring on an ammeter wiring terminal due to the withstand voltage level, and can improve the use safety of the single-phase ammeter and be beneficial to inspection and maintenance of maintainers by monitoring the temperature of the single-phase ammeter wiring terminal and setting corresponding program rules to output alarm and trip control. After the temperature monitoring function of the terminal is added, the temperature rise and the temperature decrease of the terminal caused by the increase or the decrease of the load in the power utilization process can be directly monitored by the electric meter, once the temperature is abnormal, a user can be prompted through a fault code on the display screen and the flickering of the liquid crystal display screen, and the terminal can be connected with a background system to inform the user or a manager of maintenance through other means.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a terminal portion of the present invention.
FIG. 3 is a schematic diagram of the MCU of the present invention.
Fig. 4 is a circuit schematic of the expansion circuit of the present invention.
Fig. 5 is a schematic circuit diagram of the temperature acquisition module of the present invention.
FIG. 6 is a control flow diagram of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 6, the present embodiment discloses a terminal temperature monitoring system of a single-phase electric meter, which includes a temperature probe, a temperature acquisition module, an MCU, a single-phase electric meter, and a magnetic latching relay; the temperature probe comprises a live wire temperature probe and a zero line temperature probe, the one-way electric meter is provided with a plurality of wiring terminals, and the wiring terminals comprise a live wire wiring terminal and a zero line wiring terminal; the live wire temperature probe is arranged at one end of a live wire connecting terminal of the single-phase electric meter, and the zero line temperature probe is arranged at one end of a zero line outlet terminal of the single-phase electric meter; the temperature probe is connected with the temperature acquisition module, and the temperature acquisition module and the magnetic latching relay are respectively connected with the signal input end and the signal output end of the MCU;
the temperature of the measuring sides of the live wire and the zero line of the unidirectional ammeter is acquired through the temperature probe, processed and sent to the MCU through the temperature acquisition module and judged and analyzed with set data, and then output to the magnetic latching relay control circuit state according to the set program.
Preferably, one end of the temperature probe is provided with a resin layer, the resin layer enables one end of the temperature probe to be embedded and sealed on the wiring terminal, and the other end of the temperature probe is provided with a lead connected with the temperature probe; the terminal is equipped with the insulating gum cover in the resin layer tip, insulating gum cover and the outside parcel of resin layer are equipped with the terminal gum cover of colding pressing, the terminal gum cover of colding pressing will resin layer and insulating adhesive tape are fixed on the binding post.
Preferably, the material used for the resin layer is epoxy resin.
Preferably, when the temperature value acquired by the temperature probe is higher than the upper limit of the normal temperature or lower than the lower limit of the normal temperature, the temperature is judged to be abnormal, the overtemperature alarm or trip function is turned off at the moment, and whether the magnetic latching relay is overloaded or not is judged according to the acquired current incoming line.
Preferably, when the temperature value acquired by the temperature probe is lower than the upper limit of the normal temperature and reaches the alarm temperature, or the temperature value acquired by the temperature probe is higher than the lower limit of the normal temperature and reaches the alarm temperature, the alarm or trip function is triggered.
Preferably, the set alarm temperature is different from the trip temperature, and the alarm temperature is lower than the trip temperature, and when the temperature slowly rises, the alarm is triggered first and then the trip is triggered.
Preferably, when the temperature rises sharply and is directly higher than the trip limit value in a short time, the alarm is still given, but the trip delay is lengthened, the delay time is inversely proportional to the current temperature overrun range, the time is shorter as the temperature is higher, the shortest time is 30 seconds, and the longest time is 5 minutes.
Preferably, during the timing before tripping, if the temperature is in a downward trend, the timing is decreased, if the upward trend is generated again, the timing is increased until the temperature is lower than the tripping limit value, or the timing is tripped after reaching.
Preferably, the MCU is connected with a background system and a display screen, and the background system is connected with a mobile terminal.
In this embodiment, in order to ensure the response speed of temperature measurement, the probe and the terminal are required to be close to each other, but since the terminal has strong current, and the measuring side belongs to a secondary side weak current part, the insulation withstand voltage class of the measuring side is required to satisfy class ii, namely 4 kV. Conventional temperature probes do not achieve such high withstand voltages. In order to achieve II-level voltage resistance, a layer of epoxy resin is arranged on the temperature probe through a triple insulation means during design, then an insulating rubber sleeve is sleeved outside the temperature probe, and finally the temperature probe is encapsulated by the epoxy resin and then is subjected to cold pressing on a terminal. The cold-pressed end is made of copper, the copper is contacted with epoxy resin, the epoxy resin is contacted with a cold-pressed terminal rubber sleeve, and an insulating rubber sleeve is tightly connected with a temperature probe, so that the voltage-resistant grade can be achieved, and the temperature response speed can be improved. The temperature probe manufactured in the way can withstand voltage of 5-6 kV through tests.
In this embodiment, 5 prototype machines are used to test the precision and the alarm and trip protection functions, each parameter is tested for 50 times continuously, and the test results are as follows:
in addition, in this embodiment, the model parameters of the relevant components in the schematic diagram of the circuit are as follows:
| name (R) | Model/parameter | Numbering in the figures | Function of |
| Single chip microcomputer | HT6025 | U5 | Main controller |
| Temperature probe | MF52A | NTC1 | Collection live wireTerminal temperature |
| Temperature probe | MF52A | NTC2 | Acquiring the temperature of the zero line terminal |
| Resistance (RC) | 10kΩ | R36/R37/R78/R79 | Partial pressure |
| Resistance (RC) | 4.7kΩ | R38/R80 | Partial pressure |
| Capacitor with a capacitor element | 0.1uF | C39/C57/C54/C56 | Collected signal filtering |
As shown in fig. 1, fig. 1 is a schematic structural diagram of the electric meter in the embodiment, which includes an electric meter bottom case 1, and a zero line temperature probe 6, a zero line current transformer 5, a magnetic latching relay 4, a connection terminal 2, and a live line temperature probe 3 that are arranged in the electric meter bottom case 1; and a fixing screw 7 for fixing the terminal block 2.
In fig. 2, a cold-pressed terminal 11, a cold-pressed terminal rubber sleeve 12, an insulating rubber sleeve 9, an epoxy resin layer 10, a lead 8 and a temperature probe 13 are included; the specific structure and principle are the same as those described above in the present embodiment.
In addition, in another embodiment, the MCU is also connected with a peripheral expansion circuit.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A terminal temperature monitoring system of a single-phase electric meter is characterized by comprising a temperature probe, a temperature acquisition module, an MCU (microprogrammed control unit), the single-phase electric meter and a magnetic latching relay; the temperature probe comprises a live wire temperature probe and a zero line temperature probe, the one-way electric meter is provided with a plurality of wiring terminals, and the wiring terminals comprise a live wire wiring terminal and a zero line wiring terminal; the live wire temperature probe is arranged at one end of a live wire connecting terminal of the single-phase electric meter, and the zero line temperature probe is arranged at one end of a zero line outlet terminal of the single-phase electric meter; the temperature probe is connected with the temperature acquisition module, and the temperature acquisition module and the magnetic latching relay are respectively connected with the signal input end and the signal output end of the MCU;
the temperature of the measuring sides of the live wire and the zero line of the unidirectional ammeter is acquired through the temperature probe, processed and sent to the MCU through the temperature acquisition module and judged and analyzed with set data, and then output to the magnetic latching relay control circuit state according to the set program.
2. The system for monitoring the temperature of the terminal of the single-phase electric meter as claimed in claim 1, wherein the temperature probe is provided with a resin layer at one end, the resin layer encapsulates one end of the temperature probe on the wiring terminal, and the other end is provided with a lead wire connected with the temperature probe; the terminal is equipped with the insulating gum cover in the resin layer tip, insulating gum cover and the outside parcel of resin layer are equipped with the terminal gum cover of colding pressing, the terminal gum cover of colding pressing will resin layer and insulating adhesive tape are fixed on the binding post.
3. The system as claimed in claim 2, wherein the resin layer is made of epoxy resin.
4. The system for monitoring the terminal temperature of the single-phase electric meter according to claim 1, wherein when the temperature value acquired by the temperature probe is higher than the upper limit of the normal temperature or lower than the lower limit of the normal temperature, the temperature is judged to be abnormal, at the moment, the overtemperature alarm or the trip function is turned off, and whether the magnetic latching relay is overloaded or not is judged according to the acquired current incoming line.
5. The system of claim 4, wherein the alarm or trip function is triggered when the temperature value collected by the temperature probe is lower than the upper limit of the normal temperature and reaches the alarm temperature, or when the temperature value collected by the temperature probe is higher than the lower limit of the normal temperature and reaches the alarm temperature.
6. The system of claim 5, wherein the alarm temperature is different from the trip temperature, and the alarm temperature is lower than the trip temperature, and when the temperature rises slowly, the alarm is triggered first and then the trip is triggered.
7. The system as claimed in claim 6, wherein when the temperature rises sharply and rises above the trip limit value in a short time, the alarm is still given, but the trip delay is lengthened, the delay time is inversely proportional to the current temperature overrun range, and the time is shorter at higher temperature, the shortest is 30 seconds, and the longest is 5 minutes.
8. The system of claim 7, wherein during the time period before tripping, if the temperature is trending downward, the time period is decremented, and if the temperature is trending upward again, the time period is incremented until the temperature is below the trip limit, or the time period is tripped after reaching the trip limit.
9. The system for monitoring the terminal temperature of the single-phase electric meter according to any one of claims 1 to 8, wherein the MCU is connected with a background system and a display screen, and the background system is connected with a mobile terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831170.4A CN113483904A (en) | 2021-07-22 | 2021-07-22 | Terminal temperature monitoring system of single-phase ammeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110831170.4A CN113483904A (en) | 2021-07-22 | 2021-07-22 | Terminal temperature monitoring system of single-phase ammeter |
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| CN113483904A true CN113483904A (en) | 2021-10-08 |
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| CN202110831170.4A Pending CN113483904A (en) | 2021-07-22 | 2021-07-22 | Terminal temperature monitoring system of single-phase ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115127193A (en) * | 2022-07-06 | 2022-09-30 | 宁波奥克斯电气股份有限公司 | Detection method and system for loose wiring of zero line and live line and air conditioner outdoor unit |
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| CN104882851A (en) * | 2015-06-16 | 2015-09-02 | 国家电网公司 | Temperature-rise electric contact protection device for power high-voltage switch cabinet fault, and control method |
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