CN102621370A - Magnifying power adjusting circuit for MOA (Metal Oxide Arrester) resistive current detection system - Google Patents
Magnifying power adjusting circuit for MOA (Metal Oxide Arrester) resistive current detection system Download PDFInfo
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- CN102621370A CN102621370A CN2012100787361A CN201210078736A CN102621370A CN 102621370 A CN102621370 A CN 102621370A CN 2012100787361 A CN2012100787361 A CN 2012100787361A CN 201210078736 A CN201210078736 A CN 201210078736A CN 102621370 A CN102621370 A CN 102621370A
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Abstract
The invention discloses a magnifying power adjusting circuit for an MOA (Metal Oxide Arrester) resistive current detection system. The magnifying power adjusting circuit comprises an analog switch, a resistor R28, a resistor R29, a resistor R30 and a resistor R31 connected with the four input ends of the analog switch and a backing-stage amplifying circuit respectively, an amplifier and a resistor R27, wherein the out-phase input end of the amplifier is connected with the output end of the analog switch; the in-phase input end is used for a voltage increasing level; and the resistor 27 is connected with the out-phase input end and output end of the amplifier. On the basis of Backing-stage Amplifying Circuit for MOA Resistance Current Detection System, a full-current signal of an MOA which is subjected to primary amplification is further amplified through adjustable magnifying power, so that the aim of further amplifying is fulfilled.
Description
Technical field
The present invention relates to a kind of amplifying circuit, relate in particular to the enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system.
Background technology
Traditional Zinc-Oxide Arrester detection system is introduced required voltage signal and current signal in the same equipment; Voltage signal is that the secondary side of the capacitance type potential transformer (CVT) from transformer station takes out; Current signal can take out through current transformer from the ground wire of Zinc-Oxide Arrester (MOA); The perhaps lightning stroke counter through the Zinc-Oxide Arrester lower end is clipped in the two ends of lightning stroke counter with current clamp, gets method of current through small resistor resistive total current is taken out.So just need be in whole measuring process in the secondary side wiring of CVT.In order to save the CVT secondary side wiring in the measuring process, the applicant in submitting on the same day of the application the patented claim of " a kind of MOA current in resistance property detection system " by name, like Fig. 1.A/D (mould/number) converter that carries for second microprocessor 21 that solves certain model again can't be handled the problem of negative level signal; The applicant in submitting on the same day of the application the patented claim of by name " preamplifying circuit that is used for a kind of MOA current in resistance property detection system ", like Fig. 2.But just carried out amplifying this moment preliminaryly, can not regulate multiple.Therefore how to carry out more effectively, and more the multiple of more options is regulated, and is the problem that needs solve.
Summary of the invention
The enlargement factor regulating circuit that the objective of the invention is to overcome the defective of prior art and be provided for a kind of MOA current in resistance property detection system; It is on the basis of " preamplifying circuit that is used for a kind of MOA current in resistance property detection system "; To pass through the full current signal of preliminary amplification MOA and further amplify, thereby reach requirement through adjustable enlargement factor.
The technical scheme that realizes above-mentioned purpose is:
The enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system; Said MOA current in resistance property detection system comprises CVT monitor cartridge and MOA monitor cartridge; Said CVT monitor cartridge comprises first holding circuit; First microprocessor; First amplifying circuit; The one GPS module; First wireless communication module and a Flash storer; Said MOA monitor cartridge comprises second holding circuit; Second microprocessor; Second amplifying circuit; The 2nd GPS module; Second wireless communication module; The 2nd Flash storer; Keyboard and display screen
Said second amplifying circuit comprises preamplifying circuit, and this preamplifying circuit will receive the full current signal amplification of MOA and lift and be positive level;
Said second amplifying circuit also comprises the enlargement factor regulating circuit that connects said preamplifying circuit; Said enlargement factor regulating circuit comprises analog switch, connects resistance R 28, resistance R 29, resistance R 30 and resistance R 31, amplifier and the resistance R 27 of four input ends and the said preamplifying circuit of this analog switch respectively, wherein:
Said amplifier's inverting input connects the output terminal of said analog switch, and in-phase input end receives one and lifts voltage level;
Resistance R 27 connects said amplifier's inverting input and output terminal.
The above-mentioned enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system, wherein, the in-phase input end of said amplifier receives the said voltage level of lifting through resistance R 33.
The above-mentioned enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system, wherein, said amplifier's inverting input connects the output terminal of said analog switch through resistance R 32.
The above-mentioned enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system, wherein, resistance R 28 is got 5.1k Ω, and resistance R 29 is got 10k Ω, and resistance R 30 is got 20k Ω, and resistance R 31 is got 100k Ω, and resistance R 27 is got 100k Ω.
The invention has the beneficial effects as follows:
The present invention will pass through the full current signal of preliminary amplification MOA and further amplify through adjustable enlargement factor on the basis of " preamplifying circuit that is used for a kind of MOA current in resistance property detection system ", thereby reach more accurate requirement.Simultaneously, the present invention is simple in structure and be easy to realize.
Description of drawings
Fig. 1 is the structural representation of MOA current in resistance property detection system;
Fig. 2 is the circuit diagram that is used for a kind of preamplifying circuit of MOA current in resistance property detection system;
Fig. 3 is the circuit diagram that is used for a kind of enlargement factor regulating circuit of MOA current in resistance property detection system of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, the MOA monitor cartridge 2 that MOA current in resistance property detection system comprises the CVT monitor cartridge 1 that connects CVT and is connected the lightning stroke counter two ends that the MOA lower end is connected in series, CVT monitor cartridge 1 and 2 wireless connections of MOA monitor cartridge, wherein:
Second amplifying circuit 22 comprises preamplifying circuit and enlargement factor regulating circuit, and said preamplifying circuit will receive the full current signal amplification of MOA and lift and be positive level, send said enlargement factor regulating circuit then to.See also Fig. 2, said preamplifying circuit comprises resistance R 23, connects resistance R 17 and resistance R 26, instrument amplifier U11 and the voltage follower 100 at resistance R 23 two ends respectively, wherein:
Resistance R 17 ground connection and parallelly connected with capacitor C 27; Resistance R 26 ground connection and parallelly connected with capacitor C 28;
Two input ends of instrument amplifier U11 connect the two ends of resistance R 23; Receive the level signal at the two ends of this resistance R 23; The Vcom pin of instrument amplifier U11 also receives one and lifts voltage level, thus will pass through current-voltage conversion and amplify after full current signal lift and be positive level;
Voltage follower 100 connects the output terminal of instrument amplifier U11.
Voltage follower 100 comprises amplifier U12 and resistance R 21.
See also Fig. 3; Enlargement factor regulating circuit of the present invention comprises analog switch U16, connects resistance R 28, resistance R 29, resistance R 30 and resistance R 31, amplifier U18 and the resistance R 27 of four input ends (S1-S4) and the said preamplifying circuit of this analog switch U16 respectively, wherein:
The inverting input of amplifier U18 is through the output terminal (D) of resistance R 32 connection analog switch U16, and in-phase input end receives one through resistance R 33 and lifts voltage level;
Resistance R 27 connects inverting input and the output terminal of amplifier U18.
In the present embodiment, the model that amplifier U18 selects for use is LMV321; The model of selecting for use of analog switch U16 is ADG658, controls through A0, A1 and three ports of A2, selects eight input ends of S1-S8 and output terminal D to be communicated with, and has used S1-S4 four tunnel among the present invention, and so the 000-011 of corresponding A 2A1A0 is with the direct ground connection of A2.Resistance R 28, resistance R 29, resistance R 30 and resistance R 31 respectively corresponding four kinds of enlargement factors are taken as 5.1k Ω, 10k Ω, 20k Ω and 100k Ω respectively, and R27 is taken as 100k Ω, are all 1%, 50ppm resistance.The conducting resistance of ADG658 is merely 45 Ω, and is little to the enlargement factor influence with respect to the resistance less than 1% in the amplifying circuit, so enlargement factor is respectively:
Therefore; The present invention is on the basis of " preamplifying circuit that is used for a kind of MOA current in resistance property detection system "; The full current signal that to pass through preliminary amplification MOA further through adjustable enlargement factor carry out 1 times,, 5 times, 10 times or 20 times of amplifications, reach the purpose of further adjusting.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (4)
1. the enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system; Said MOA current in resistance property detection system comprises CVT monitor cartridge and MOA monitor cartridge; Said CVT monitor cartridge comprises first holding circuit; First microprocessor; First amplifying circuit; The one GPS module; First wireless communication module and a Flash storer; Said MOA monitor cartridge comprises second holding circuit; Second microprocessor; Second amplifying circuit; The 2nd GPS module; Second wireless communication module; The 2nd Flash storer; Keyboard and display screen
Said second amplifying circuit comprises preamplifying circuit, and this preamplifying circuit will receive the full current signal amplification of MOA and lift and be positive level;
It is characterized in that; Said second amplifying circuit also comprises the enlargement factor regulating circuit that connects said preamplifying circuit; Said enlargement factor regulating circuit comprises analog switch, connects resistance R 28, resistance R 29, resistance R 30 and resistance R 31, amplifier and the resistance R 27 of four input ends and the said preamplifying circuit of this analog switch respectively, wherein:
Said amplifier's inverting input connects the output terminal of said analog switch, and in-phase input end receives one and lifts voltage level;
Resistance R 27 connects said amplifier's inverting input and output terminal.
2. the enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 is characterized in that, the in-phase input end of said amplifier receives the said voltage level of lifting through resistance R 33.
3. the enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 is characterized in that, said amplifier's inverting input connects the output terminal of said analog switch through resistance R 32.
4. the enlargement factor regulating circuit that is used for a kind of MOA current in resistance property detection system according to claim 1 is characterized in that resistance R 28 is got 5.1k Ω, and resistance R 29 is got 10k Ω, and resistance R 30 is got 20k Ω, and resistance R 31 is got 100k Ω, and resistance R 27 is got 100k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100787361A CN102621370A (en) | 2012-03-22 | 2012-03-22 | Magnifying power adjusting circuit for MOA (Metal Oxide Arrester) resistive current detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100787361A CN102621370A (en) | 2012-03-22 | 2012-03-22 | Magnifying power adjusting circuit for MOA (Metal Oxide Arrester) resistive current detection system |
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| Publication Number | Publication Date |
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| CN102621370A true CN102621370A (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100787361A Pending CN102621370A (en) | 2012-03-22 | 2012-03-22 | Magnifying power adjusting circuit for MOA (Metal Oxide Arrester) resistive current detection system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201373895Y (en) * | 2009-03-09 | 2009-12-30 | 浙江纪元电气集团有限公司 | Online monitoring device of zinc oxide arrester (MOA) |
| CN102621367A (en) * | 2012-03-22 | 2012-08-01 | 上海市电力公司 | Pre-amplification circuit for MOA (metal oxide arrester) resistive current detecting system |
-
2012
- 2012-03-22 CN CN2012100787361A patent/CN102621370A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201373895Y (en) * | 2009-03-09 | 2009-12-30 | 浙江纪元电气集团有限公司 | Online monitoring device of zinc oxide arrester (MOA) |
| CN102621367A (en) * | 2012-03-22 | 2012-08-01 | 上海市电力公司 | Pre-amplification circuit for MOA (metal oxide arrester) resistive current detecting system |
Non-Patent Citations (1)
| Title |
|---|
| 王又佳: "基于GPS同步的MOA阻性电流带电检测系统", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20121017 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121017 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120801 |