CN202720260U - Intelligent electric power detection meter - Google Patents

Intelligent electric power detection meter Download PDF

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Publication number
CN202720260U
CN202720260U CN 201220367900 CN201220367900U CN202720260U CN 202720260 U CN202720260 U CN 202720260U CN 201220367900 CN201220367900 CN 201220367900 CN 201220367900 U CN201220367900 U CN 201220367900U CN 202720260 U CN202720260 U CN 202720260U
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CN
China
Prior art keywords
voltage
current
circuit
transformer
microprocessor
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.)
Expired - Fee Related
Application number
CN 201220367900
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Chinese (zh)
Inventor
周辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENGDU SHENGHUI ELECTRONIC TECHNOLOGY Co Ltd
Original Assignee
CHENGDU SHENGHUI ELECTRONIC TECHNOLOGY Co Ltd
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Priority to CN 201220367900 priority Critical patent/CN202720260U/en
Application granted granted Critical
Publication of CN202720260U publication Critical patent/CN202720260U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses an intelligent electric power detection meter. The intelligent electric power detection meter comprises a voltage determination structure, a current determination structure, a microprocessor and a digital display tube. The voltage determination structure, the current determination structure and the digital display tube are respectively connected with the microprocessor. According to the utility model, the accuracy grade of the voltage determination structure can reach 0.1; the current determination structure adopts a magnetic ring as a noise reduction structure, thus the interference of a current signal in a current circuit to be detected and other electric signals to a current signal, which is after mutual inductance, of a current transformer can be reduced, and the accuracy grade of the current determination meter with the noise reduction structure can reach 0.5.

Description

Electric intelligent detects table
Technical field
The utility model belongs to the Power Electronic Technique detection field, specifically, relates to a kind of electric intelligent detection table.
Background technology
Voltage table is a kind of instrument of measuring voltage, common voltage table-voltage meter symbol: V, in the sensitive galvanometer the inside permanent magnet is arranged, coil that is consisted of by wire of series connection between galvanometric two binding posts, coil is placed in the magnetic field of permanent magnet, and links to each other with the pointer of table by gearing.Most of voltage table all is divided into two ranges, and (0-3V) (0-15V), this voltage table is only applicable to the mensuration that small voltage and light current are pressed.
Existing A.C. voltmeter mainly adopt rectifier type ammeter, electromagnetic system ammeter, electronic be that ammeter and static are the measuring mechanism of ammeter.Destaticing is outside the voltage table, and other are that voltage table all is to be in series with small range ammeter and voltage divider.Also the voltage divider of available several resistance compositions is connected with measuring mechanism and is formed multivoltmeter.These A.C. voltmeters that are are difficult to make lower range, and minimum range is between several volts are to tens volts, and maximum amount Cheng Ze is about 1~2 kilovolt.Static is that the minimum range of voltage table is about 30 volts, and that maximum amount Cheng Ze can reach is very high.The high-tension voltmeter of using in the electric system is to be 100 volts electromagnetic system voltage table by the voltagerating range, forms in conjunction with the voltage transformer (VT) of appropriate voltage no-load voltage ratio.Owing to be subjected to the restriction of measuring mechanism coil inductance, the electromagnetic system voltage table, electronic be that the frequency of utilization scope of voltage table is narrower, upper limiting frequency is lower than 1~2 kilo hertz.Electronic system slightly is better than electromagnetic system.Static system and thermoelectricity are that the frequency of utilization scope of voltage table is all wider.Several kilo hertzs approximately of the upper limit frequencies of utilization of rectifier type voltage table, but only be noted that when alternating voltage was sinusoidal waveform, rectifier type ammeter reading was only correct.
In the Chinese industrial electricity consumption, single-phase is 220V, and three-phase is 380V, and frequency is 50 hertz.Its measurement result precision was not high when above-mentioned A.C. voltmeter was used for industrial voltage determination.
Reometer is the instrument of size of current in the metering circuit.Alternating current ammeter mainly adopt the electromagnetic system ammeter, electronic be the measuring mechanism of ammeter and rectifier type ammeter.The minimum range of electromagnetic system measuring mechanism is about tens milliamperes, for improving range, reduce in proportion coil turn, and add heavy gauge wire.With electronic be measuring mechanism when consisting of reometer, moving-coil is in parallel with quiet circle, its minimum range is about tens milliamperes.For improving range, reduce the quiet circle number of turn, and add heavy gauge wire, or change two Jing Quan into parallel connection by series connection, then the range of reometer will increase and be twice.During with rectifier type ammeter test cross stream electric current, only when exchanging as sinusoidal waveform, the reometer reading is just correct.For range extension also can utilize shunt.In addition, also available thermoelectric (al) type ammeter measuring mechanism is measured high-frequency current.Mostly the wide range alternating current ammeter that uses in electric system is the electromagnetic system reometer with 5A or 1A.
All there is instrument error in every kind of surveying instrument, all can introduce uncertain composition in the time of measure physical quantities, uncertainty size available formula: the △=A*a% of reometer, and wherein A represents range, a represents class of accuracy.Active electric energy meter commonly used has 0.5,1.0,2.0 3 class of accuracy.0.5 level electric energy meter permissible error is in ± 0.5%; 1.0 level electric energy meter permissible error is in ± 1%; 2.0 level electric energy meter permissible error is in ± 2%.
Present industrial alternating current ammeter, the class of accuracy of its measurement is difficult to reach 0.5 grade.And if the mode that current circuit to be measured directly passes current transformer measures electric current, the current signal in the current circuit to be measured and other electric signal current signal interference effect after to the current transformer mutual inductance is larger, the class of accuracy that impact is measured.
The utility model content
Technical problem to be solved in the utility model provides a kind of electric intelligent detection table, and this detection table can be measured the voltage and current value simultaneously, and magnitude of voltage and current value have all been taked noise reduction process, and the precision of the voltage and current value of therefore measuring is all higher.
The utility model solves the problems of the technologies described above the technical scheme that adopts: electric intelligent detects table, comprise voltage determination structure, amperometric determination structure, microprocessor, digital display tube, voltage determination structure, amperometric determination structure, digital display tube are connected with microprocessor respectively; The voltage determination structure comprises two voltage wiring terminals to be measured, 200K Europe precision metallic film resistance, voltage transformer (VT), sample resistance, signal amplifier, one of them voltage wiring terminal to be measured is connected by an input end of circuit and voltage transformer (VT), another voltage wiring terminal to be measured is connected with another input end of 200K Europe precision metallic film resistance and voltage transformer (VT) successively by circuit, an output terminal of voltage transformer (VT) is by line-to-ground, another output terminal of voltage transformer (VT) by circuit successively with the secondary signal amplifier, microprocessor is connected, described sample resistance one end is by line-to-ground, and the other end is connected by the circuit between circuit and secondary signal amplifier and the voltage transformer (VT); The amperometric determination structure comprises current transformer, current circuit to be measured, first signal amplifier, magnet ring, the cross section of described current transformer, magnet ring is the structure of annulus, current circuit to be measured pass magnet ring cylindrical shape hollow structure and after the magnet ring outer wall unrolls a circle, pass again the hollow structure of the cylindrical shape of magnet ring, then pass the hollow structure of the cylindrical shape of current transformer, an output terminal of current transformer is by line-to-ground, and another output terminal of current transformer is connected with first signal amplifier (3) and microprocessor successively by circuit.
Particularly, described sample resistance is 250 Europe precision metallic film resistances.
The cross-sectional sizes of described magnet ring, current transformer is identical.
Further, also comprise warning device, host computer, warning device is connected by circuit and microprocessor, and host computer is by circuit and/or wireless transport module and microprocessor connection.
Compared with prior art, the utlity model has following advantage and beneficial effect: voltage determination structure precision grade of the present utility model can reach 0.1 grade, the amperometric determination structure adopts magnet ring as denoising structure, current signal in the current circuit to be measured and other electric signal current signal interference effect after to the current transformer mutual inductance can be reduced, 0.5 grade can be reached so that have the class of accuracy of the amperometric determination table of this denoising structure.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Parts title corresponding to attached number in the figure is: the 1-current transformer; 2-current circuit to be measured; 3-first signal amplifier; The 4-microprocessor; The 5-digital display tube; The 6-magnet ring; The 7-host computer; The 8-wireless transport module; The 9-warning device; 11-200K Europe precision metallic film resistance; 12-voltage wiring terminal to be measured; The 13-voltage transformer (VT); 14-sample resistance 250 Europe precision metallic film resistances; 15-secondary signal amplifier.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1:
As shown in Figure 1, present embodiment electric intelligent detection table comprises voltage determination structure, amperometric determination structure, microprocessor 4, digital display tube 5, and voltage determination structure, amperometric determination structure, digital display tube 5 are connected with microprocessor 4 respectively; The voltage determination structure comprises two voltage wiring terminals 12 to be measured, 200K Europe precision metallic film resistance 11, voltage transformer (VT) 13, sample resistance 14, signal amplifier 3, one of them voltage wiring terminal 12 to be measured is connected by an input end of circuit and voltage transformer (VT) 3, another voltage wiring terminal 12 to be measured is connected with another input end of 200K Europe precision metallic film resistance 11 and voltage transformer (VT) 13 successively by circuit, an output terminal of voltage transformer (VT) 13 is by line-to-ground, another output terminal of voltage transformer (VT) 13 by circuit successively with secondary signal amplifier 15, microprocessor 4 is connected, described sample resistance 14 1 ends are by line-to-ground, and the other end is connected by the circuit between circuit and secondary signal amplifier 15 and the voltage transformer (VT) 13; The amperometric determination structure comprises current transformer 1, current circuit 2 to be measured, first signal amplifier 3, magnet ring 6, described current transformer 1, the cross section of magnet ring 6 is the structure of annulus, current circuit 2 to be measured pass magnet ring 6 cylindrical shape hollow structure and after magnet ring 6 outer walls unroll a circle, pass again the hollow structure of the cylindrical shape of magnet ring 6, then pass the hollow structure of the cylindrical shape of current transformer 1, an output terminal of current transformer 1 is by line-to-ground, and another output terminal of current transformer 1 is connected with first signal amplifier 3 and microprocessor 4 successively by circuit.
The sample resistance 14 of present embodiment is selected 250 Europe precision metallic film resistances.
Present embodiment adopts magnet ring as denoising structure, current signal in the current circuit to be measured and other electric signal current signal interference effect after to the current transformer mutual inductance can be reduced, 0.5 grade can be reached so that have the class of accuracy of the amperometric determination table of this denoising structure.
In order further to reduce current signal in the current circuit to be measured and other electric signal current signal interference effect after to the current transformer mutual inductance, find through overtesting, when the cross-sectional sizes of described magnet ring 6, described current transformer 1 is identical, its noise reduction is the most remarkable, noise reduction be cross-sectional sizes do not wait more than 1.2 times.
The ammeter measurement has certain accuracy class, and 0.1 grade, 0.2 grade, 0.5 grade, 1 grade, 1.5 grades, 2.5 grades, 5 grades, totally 7 grades.0.1 class precision is the highest, 5 class precisions are minimum.For example 5 grades is exactly 5 volts of 100 volts of errors.Its accuracy class can reach 0.1 grade when the Intelligent Measurement table of present embodiment was measured voltage.
Also comprise warning device 9, host computer 7, warning device 9 is connected by circuit and microprocessor 4, and host computer 7 is connected with microprocessor 4 by circuit and/or wireless transport module 8.This warning device can be by inputting alarm current/voltage at microprocessor, surpasses to set the current/voltage upper limit or measure current/voltage and be lower than and set under the current/voltage in limited time when measuring current/voltage, reports to the police by warning device.Avoid the excess current/voltage of commercial unit or the operation under low current/voltage, cause the damage of commercial unit.In order further to guarantee the safety of commercial unit, can also quit work by computing machine or PLC control this electricity consumption when warning device is reported to the police commercial unit.
As mentioned above, just can realize preferably the utility model.

Claims (4)

1. electric intelligent detects table, it is characterized in that: comprise voltage determination structure, amperometric determination structure, microprocessor (4), digital display tube (5), voltage determination structure, amperometric determination structure, digital display tube (5) are connected with microprocessor (4) respectively; The voltage determination structure comprises two voltage wiring terminals to be measured (12), 200K Europe precision metallic film resistance (11), voltage transformer (VT) (13), sample resistance (14), signal amplifier (3), one of them voltage wiring terminal to be measured (12) is connected by an input end of circuit and voltage transformer (VT) (3), another voltage wiring terminal to be measured (12) is connected with another input end of 200K Europe precision metallic film resistance (11) and voltage transformer (VT) (13) successively by circuit, an output terminal of voltage transformer (VT) (13) is by line-to-ground, another output terminal of voltage transformer (VT) (13) by circuit successively with secondary signal amplifier (15), microprocessor (4) is connected, described sample resistance (14) one ends are by line-to-ground, and the other end is connected by the circuit between circuit and secondary signal amplifier (15) and the voltage transformer (VT) (13); The amperometric determination structure comprises current transformer (1), current circuit to be measured (2), first signal amplifier (3), magnet ring (6), described current transformer (1), the cross section of magnet ring (6) is the structure of annulus, current circuit to be measured (2) pass magnet ring (6) cylindrical shape hollow structure and after magnet ring (6) outer wall unrolls a circle, pass again the hollow structure of the cylindrical shape of magnet ring (6), then pass the hollow structure of the cylindrical shape of current transformer (1), an output terminal of current transformer (1) is by line-to-ground, and another output terminal of current transformer (1) is connected with first signal amplifier (3) and microprocessor (4) successively by circuit.
2. electric intelligent according to claim 1 detects table, and it is characterized in that: described sample resistance (14) is 250 Europe precision metallic film resistances.
3. electric intelligent according to claim 1 and 2 detects table, and it is characterized in that: the cross-sectional sizes of described magnet ring (6), current transformer (1) is identical.
4. electric intelligent according to claim 2 detects table, it is characterized in that: also comprise warning device (9), host computer (7), warning device (9) is connected by circuit and microprocessor (4), and host computer (7) is connected with microprocessor (4) by circuit and/or wireless transport module (8).
CN 201220367900 2012-07-27 2012-07-27 Intelligent electric power detection meter Expired - Fee Related CN202720260U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220367900 CN202720260U (en) 2012-07-27 2012-07-27 Intelligent electric power detection meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220367900 CN202720260U (en) 2012-07-27 2012-07-27 Intelligent electric power detection meter

Publications (1)

Publication Number Publication Date
CN202720260U true CN202720260U (en) 2013-02-06

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Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102759650A (en) * 2012-07-27 2012-10-31 成都生辉电子科技有限公司 Electric power intelligent detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102759650A (en) * 2012-07-27 2012-10-31 成都生辉电子科技有限公司 Electric power intelligent detector

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130206

Termination date: 20130727