CN203849398U - An electric energy meter on-site value transmission apparatus - Google Patents
An electric energy meter on-site value transmission apparatus Download PDFInfo
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- CN203849398U CN203849398U CN201420132715.8U CN201420132715U CN203849398U CN 203849398 U CN203849398 U CN 203849398U CN 201420132715 U CN201420132715 U CN 201420132715U CN 203849398 U CN203849398 U CN 203849398U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 238000013519 translation Methods 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 19
- 238000007667 floating Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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Abstract
The utility model discloses an electric energy meter on-site value transmission apparatus comprising a sampling circuit, a variable gain amplification circuit, an AD converting circuit, a microprocessor and an industrial control computer. The sampling circuit is externally connected with a three-phase voltage output terminal and a three-phase current output terminal of an on-site electric energy meter. An output terminal of the sampling circuit sequentially goes through the variable gain amplification circuit and the AD converting circuit to be connected with the microprocessor. The electric energy meter on-site value transmission apparatus of the utility model can accurately reflect working conditions of the on-side electric energy meter; the precision is high; the stability is high; the reliability is high; and a good application prospect is provided.
Description
Technical field
The utility model relates to a kind of electric energy meter field transmission of quantity value device, belongs to digitalized electric energy field of measuring techniques.
Background technology
In electric energy meter international recommendation and vertification regulation, the calibrating of regulation electric energy meter is carried out under laboratory condition, calibrating under laboratory condition, refer to the equipment being arranged in regulation laboratory environment that uses, according to the regulation of vertification regulation, tested table is done to test item by item, make the judgement of acceptance or rejection according to test findings; On-site proving, generally refers to and carries standard scale to on-the-spot, this standard scale inserted and approached in the electrical network at tested table place, and more tested table and the standard scale electric energy reading within the identical time, thus obtain the error of tested table.
Laboratory verification carries out conventionally under the condition of controlling, and these conditions comprise temperature, humidity, voltage fluctuation, harmonic wave, asymmetrical voltage, peripheral electromagnetic field etc.By controlling, allow these parameters are less in one, in the scope of temperature, for example temperature is 20 DEG C ± 1 DEG C; More complicated of the field condition of on-site proving, the scope of each parameter is more wide in range, and for example temperature range can be-40 DEG C～70 DEG C.Conventionally, laboratory verification can obtain the accuracy index of regulation, and the error of the accuracy of on-site proving generally can be larger, also may be difficult to determine under some conditions; Laboratory verification, will simulate various different situations according to vertification regulation, and for example different load, in a short time, being done comprehensively to check by the characteristic of test examination instrument, and is made the judgement of acceptance or rejection thus; But on-site proving, operating mode only has one, can not do comprehensively to check.
In view of on-the-spot test environment and the laboratory of on-site proving differ larger, and electric energy meter must be operated in again under field condition, the portable tester that transmission is got off through laboratory size magnitude cannot ensure accurately same at the scene, electric energy meter ability to work is at the scene accurate to any degree on earth, has become one by the major issue of extensive concern.Therefore, be necessary to carry out a kind of new technology of the transmission of quantity value that is more suitable for electric energy meter field measurement use, solve this problem.
Utility model content
The purpose of this utility model is different for Watt-hour meter's field test environment and laboratory condition, provide a kind of electric energy meter field that is more suitable for to measure the transmission of quantity value device using, can accurately reflect the working condition of field electric energy table, precision is high, stability is high, reliability is high, has a good application prospect.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of electric energy meter field transmission of quantity value device, it is characterized in that: comprise sample circuit, variable-gain amplification circuit, A/D convertor circuit, microprocessor and industrial computer, the three-phase voltage of the external field electric energy table of described sample circuit and the output terminal of electric current, the output terminal of described sample circuit is connected with microprocessor by variable-gain amplification circuit, A/D convertor circuit successively, and described microprocessor is connected with industrial computer by isa bus; Described sample circuit comprises voltage sampling circuit and current sampling circuit,
Described voltage sampling circuit comprises the dividing potential drop translation circuit being connected, and described dividing potential drop translation circuit is provided with several dividing potential drop sampling ends;
Described current sampling circuit comprises the current transformer translation circuit and the electronic compensation translation circuit that are connected, described current transformer translation circuit is provided with several current sample ends, and the output terminal of electronic compensation translation circuit is connected with the current gain input end of variable-gain amplification circuit.
Aforesaid a kind of electric energy meter field transmission of quantity value device, is characterized in that: described industrial computer is also connected with display, keyboard.
Aforesaid a kind of electric energy meter field transmission of quantity value device, is characterized in that: described dividing potential drop translation circuit is provided with 3-8 dividing potential drop sampling end.
Aforesaid a kind of electric energy meter field transmission of quantity value device, it is characterized in that: described dividing potential drop translation circuit comprises resistor voltage divider circuit and buffer amplifier circuit, described resistor voltage divider circuit is that high voltage end and low-voltage end access buffer amplifier circuit respectively after resistance R 1 and resistance R 2, and described buffer amplifier circuit is connected with the voltage gain input end of variable-gain amplification circuit.
Aforesaid a kind of electric energy meter field transmission of quantity value device, is characterized in that: described current sampling circuit is provided with 3-7 current sample end.
Aforesaid a kind of electric energy meter field transmission of quantity value device, it is characterized in that: described current sampling circuit is provided with 4 current sample ends, wherein current transformer translation circuit comprises current transformer, K switch 1-K4, described K switch 1-K4 is respectively the contact switch of current transformer primary winding coils L1 tap, described current transformer primary winding coils also comprises the second coil L2, tertiary coil L3, the 4th coil L4, one end of described the second coil L2 connects the voltage gain input end of variable-gain amplification circuit, the other end of described the second coil L2 connects the negative electrode of diode D1, the two ends of the described tertiary coil L3 resistance R 4 that is connected in parallel, connect to one end of described the 4th coil L4, the other end of described the 4th coil L4 connects the anode of diode D1, between described the second coil L2 and variable-gain amplification circuit, be also provided with resistance R 3.
Aforesaid a kind of electric energy meter field transmission of quantity value device, is characterized in that: described A/D convertor circuit comprises prime floating ground transmission circuit and rear stages of digital buffer circuit, and floating ground of prime transmission circuit is connected with rear stages of digital buffer circuit.
Aforesaid a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: floating ground of described prime transmission circuit comprises the second operational amplifier IC
2with the 3rd operational amplifier IC
3, described rear stages of digital buffer circuit comprises transformer, the signal input part of A/D convertor circuit is through the second operational amplifier IC successively
2, the 3rd operational amplifier IC
3be connected with rear stages of digital buffer circuit, described the second operational amplifier IC
2positive supply input end and transformer input winding L
5one end be connected, described the second operational amplifier IC
2negative supply input end, transformer input winding L
5another termination in analog, described transformer output winding L
6a termination positive power source terminal, described transformer output winding L
6another termination digitally; Described the 3rd operational amplifier IC
3positive supply input end connect positive power source terminal, described the 3rd operational amplifier IC
3negative pressure source connect digitally.
The beneficial effects of the utility model are: electric energy meter field transmission of quantity value device of the present utility model, comprise sample circuit, variable-gain amplification circuit, A/D convertor circuit, microprocessor and industrial computer, three-phase voltage, the current output terminal of the external field electric energy table of described sample circuit are connected, the output terminal of described sample circuit is connected with microprocessor by variable-gain amplification circuit, A/D convertor circuit successively, can accurately reflect the working condition of field electric energy table, precision is high, stability is high, reliability is high, has a good application prospect.
Brief description of the drawings
Fig. 1 is the system chart of electric energy meter field transmission of quantity value device of the present utility model.
Fig. 2 is the circuit diagram of dividing potential drop translation circuit of the present utility model.
Fig. 3 is the circuit diagram of current transformer translation circuit of the present utility model.
Fig. 4 is A/D convertor circuit volume circuit diagram of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.Following examples are only for the technical solution of the utility model is more clearly described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, electric energy meter field transmission of quantity value device of the present utility model, there is high precision, high stable, highly reliable, standardization, digitizing, stability is high, reliability is high, specifically comprise sample circuit, variable-gain amplification circuit, A/D convertor circuit, microprocessor and industrial computer, the three-phase voltage of the external field electric energy table of described sample circuit and the output terminal of electric current, the output terminal of sample circuit passes through variable-gain amplification circuit successively, A/D convertor circuit is connected with microprocessor, described microprocessor is connected with industrial computer by isa bus, isa bus transmits, safe and reliable, real-time is high, sample circuit comprises voltage sampling circuit and current sampling circuit, voltage sampling circuit comprises the dividing potential drop translation circuit being connected, dividing potential drop translation circuit is provided with several dividing potential drop sampling ends, current sampling circuit comprises the current transformer translation circuit and the electronic compensation translation circuit that are connected, described current transformer translation circuit is provided with several current sample ends, and the output terminal of electronic compensation translation circuit is connected with the current gain input end of variable-gain amplification circuit, described industrial computer is also connected with display, keyboard, and wherein industrial computer is industry control PC or dsp processor.
Described dividing potential drop translation circuit is provided with 3-8 dividing potential drop sampling end, and the utility model is selected five grades, as 30 V, 60 V, 120 V, 240 V, 480 V.
As shown in Figure 2, described dividing potential drop translation circuit comprises resistor voltage divider circuit and buffer amplifier circuit, described resistor voltage divider circuit is that high voltage end 9 and low-voltage end 10 access buffer amplifier circuit respectively after resistance R 1 and resistance R 2, described buffer amplifier circuit is connected with the voltage gain input end of variable-gain amplification circuit, wherein the first operational amplifier IC1 forms the buffer amplifier circuit after sampling, variable-gain amplification circuit can design by public prior art, and the output terminal of variable-gain amplification circuit is connected with the input end of A/D convertor circuit.
Described current sampling circuit is provided with 3-7 current sample end, as shown in Figure 3, wherein current transformer translation circuit comprises current transformer, K switch 1-K4, K switch 1-K4 is respectively the contact switch of current transformer primary winding coils L1 tap, described current transformer primary winding coils also comprises the second coil L2, tertiary coil L3, the 4th coil L4, one end of described the second coil L2 connects the voltage gain input end of variable-gain amplification circuit, the other end of described the second coil L2 connects the negative electrode of diode D1, the two ends of the described tertiary coil L3 resistance R 4 that is connected in parallel, connect to one end of described the 4th coil L4, the other end of described the 4th coil L4 connects the anode of diode D1, between described the second coil L2 and variable-gain amplification circuit, be also provided with resistance R 3, 10 electric currents in Fig. 3 are high-end, 11 electric current low sides, L1 is precision current transformer, K switch 1～K4 forms the contact switch of L1 precision current transformer winding coil tap, several current sample ends that current sample arranges just, several are chosen as integer between 3-8, the utility model is 4 current sample ends, current sampling circuit can divide fourth gear, as 1 A, 5 A, 20 A, 100 A, current measuring range 0.05-120 A, by L2, L4, D1, circuit and the L3 of R4 composition, the circuit of R3 composition is all to make measurement result precision for gear shift, stable rear class gain adjustment circuit, electronic compensation translation circuit can design by public prior art.
As shown in Figure 4, described A/D convertor circuit comprises prime floating ground transmission circuit and rear stages of digital buffer circuit, and floating ground of prime transmission circuit is connected with rear stages of digital buffer circuit; Floating ground of described prime transmission circuit comprises the second operational amplifier IC
2with the 3rd operational amplifier IC
3, described rear stages of digital buffer circuit comprises transformer, the signal input part of described A/D convertor circuit is through the second operational amplifier IC successively
2, the 3rd operational amplifier IC
3be connected with rear stages of digital buffer circuit, described the second operational amplifier IC
2positive supply input end and transformer input winding L
5one end be connected, described the second operational amplifier IC
2negative supply input end, transformer input winding L
5another termination in analog, described transformer output winding L
6a termination positive power source terminal, described transformer output winding L
6another termination digitally; Described the 3rd operational amplifier IC
3positive supply input end connect positive power source terminal, the negative pressure source of described the 3rd operational amplifier IC3 connects digitally, wherein 12 be A/D convertor circuit signal input part, transformer formation buffer circuit, the 13rd, positive power source terminal, the 15th, negative power ends.
Microprocessor of the present utility model is selected dsp processor, and model is TMS320VC33, and this routine memory circuit is made up of FLASH storer, by address, sheet choosing is connected with data bus, described FLASH storer 29F020 model in this way; The display screen that microprocessor is connected with display is that wide temperature is stablized display screen, wide temperature is stablized the display screen display screen of NL332BC35-20 model in this way, the interface circuit of dsp processor comprises the interface circuit of wired connection and radio contact, interface circuit can carry out Design and manufacture by public prior art, wherein wired connection is by RS232, and wireless connections are to be connected with outside by inner WIFI; Mutual circuit comprises the mutual circuit that voice, touch, button, multimedia are input signal; The mutual circuit that voice, touch, button, multimedia the are input signal keyboard that voice, touch, button, multimedia are input signal in this way, phonetic entry head, touch-screen, clipboard pen etc.
Electric energy meter field transmission of quantity value device of the present utility model is selected full electromagnetic armouring structure, with the inner global noise of lowering apparatus and interference, the element of the device assembling of this example, device, chip, module, assembly, parts are all selected low-temperature coefficient, or wide temperature degree of stability, or screen by strict standard, as select precision resistance, select 1PPM voltage reference etc., select by the element of strict standard screening, device, chip, module, assembly, parts, ensure that electric energy meter field transmission of quantity value device of the present utility model is through on probation, verification, calibrating, demarcate, calibration, its accurate grade reaches 0.02-0.01 grade of precision standard.
Voltage sampling circuit of the present utility model can divide six grades, as 15 V, 30 V, 60 V, 120 V, 240 V, 480 V; Current sampling circuit can divide five grades, as 0.2 A, 1 A, 5 A, 20 A, 100 A.
Voltage sampling circuit of the present utility model can divide 3 or 4 or 7 or 8 grades, and current sampling circuit of the present utility model can divide 3 or 6 or 7 grades.
More than show and described ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (8)
1. an electric energy meter field transmission of quantity value device, it is characterized in that: comprise sample circuit, variable-gain amplification circuit, A/D convertor circuit, microprocessor and industrial computer, the three-phase voltage of the external field electric energy table of described sample circuit and the output terminal of electric current, the output terminal of described sample circuit is connected with microprocessor by variable-gain amplification circuit, A/D convertor circuit successively, and described microprocessor is connected with industrial computer by isa bus; Described sample circuit comprises voltage sampling circuit and current sampling circuit,
Described voltage sampling circuit comprises the dividing potential drop translation circuit being connected, and described dividing potential drop translation circuit is provided with several dividing potential drop sampling ends;
Described current sampling circuit comprises the current transformer translation circuit and the electronic compensation translation circuit that are connected, described current transformer translation circuit is provided with several current sample ends, and the output terminal of electronic compensation translation circuit is connected with the current gain input end of variable-gain amplification circuit.
2. a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: described industrial computer is also connected with display, keyboard.
3. a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: described dividing potential drop translation circuit is provided with 3-8 dividing potential drop sampling end.
4. according to a kind of electric energy meter field transmission of quantity value device described in claim 1 or 3, it is characterized in that: described dividing potential drop translation circuit comprises resistor voltage divider circuit and buffer amplifier circuit, described resistor voltage divider circuit is that high voltage end and low-voltage end access buffer amplifier circuit respectively after resistance R 1 and resistance R 2, and described buffer amplifier circuit is connected with the voltage gain input end of variable-gain amplification circuit.
5. a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: described current sampling circuit is provided with 3-7 current sample end.
6. a kind of electric energy meter field transmission of quantity value device according to claim 1 or 5, it is characterized in that: described current sampling circuit is provided with 4 current sample ends, wherein current transformer translation circuit comprises current transformer, K switch 1-K4, described K switch 1-K4 is respectively the contact switch of current transformer primary winding coils L1 tap, described current transformer primary winding coils also comprises the second coil L2, tertiary coil L3, the 4th coil L4, one end of described the second coil L2 connects the voltage gain input end of variable-gain amplification circuit, the other end of described the second coil L2 connects the negative electrode of diode D1, the two ends of the described tertiary coil L3 resistance R 4 that is connected in parallel, connect to one end of described the 4th coil L4, the other end of described the 4th coil L4 connects the anode of diode D1, between described the second coil L2 and variable-gain amplification circuit, be also provided with resistance R 3.
7. a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: described A/D convertor circuit comprises prime floating ground transmission circuit and rear stages of digital buffer circuit, and floating ground of prime transmission circuit is connected with rear stages of digital buffer circuit.
8. a kind of electric energy meter field transmission of quantity value device according to claim 1, is characterized in that: floating ground of described prime transmission circuit comprises the second operational amplifier IC
2with the 3rd operational amplifier IC
3, described rear stages of digital buffer circuit comprises transformer, the signal input part of described A/D convertor circuit is through the second operational amplifier IC successively
2, the 3rd operational amplifier IC
3be connected with rear stages of digital buffer circuit, described the second operational amplifier IC
2positive supply input end and transformer input winding L
5one end be connected, described the second operational amplifier IC
2negative supply input end, transformer input winding L
5another termination in analog, described transformer output winding L
6a termination positive power source terminal, described transformer output winding L
6another termination digitally; Described the 3rd operational amplifier IC
3positive supply input end connect positive power source terminal, described the 3rd operational amplifier IC
3negative pressure source connect digitally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420132715.8U CN203849398U (en) | 2014-03-24 | 2014-03-24 | An electric energy meter on-site value transmission apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420132715.8U CN203849398U (en) | 2014-03-24 | 2014-03-24 | An electric energy meter on-site value transmission apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN203849398U true CN203849398U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420132715.8U Expired - Lifetime CN203849398U (en) | 2014-03-24 | 2014-03-24 | An electric energy meter on-site value transmission apparatus |
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| Country | Link |
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| CN (1) | CN203849398U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885027A (en) * | 2014-03-24 | 2014-06-25 | 国家电网公司 | On-site quantity transmission device for electric energy meter |
| CN104376128A (en) * | 2014-10-15 | 2015-02-25 | 于广沅 | Data collecting method for front end data collecting and control terminal of Internet of Things |
| CN108445285A (en) * | 2018-06-21 | 2018-08-24 | 深圳市德兰明海科技有限公司 | A kind of current sampling circuit |
-
2014
- 2014-03-24 CN CN201420132715.8U patent/CN203849398U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885027A (en) * | 2014-03-24 | 2014-06-25 | 国家电网公司 | On-site quantity transmission device for electric energy meter |
| CN103885027B (en) * | 2014-03-24 | 2016-08-17 | 国家电网公司 | A kind of electric energy meter field transmission of quantity value device |
| CN104376128A (en) * | 2014-10-15 | 2015-02-25 | 于广沅 | Data collecting method for front end data collecting and control terminal of Internet of Things |
| CN108445285A (en) * | 2018-06-21 | 2018-08-24 | 深圳市德兰明海科技有限公司 | A kind of current sampling circuit |
| CN108445285B (en) * | 2018-06-21 | 2020-09-11 | 深圳市德兰明海科技有限公司 | Current sampling circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20140924 |