CN102608377A - Reference level and lift pressure circuit used for MOA (Metal Oxide Arrester) resistive current detection system - Google Patents

Reference level and lift pressure circuit used for MOA (Metal Oxide Arrester) resistive current detection system Download PDF

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Publication number
CN102608377A
CN102608377A CN2012100795264A CN201210079526A CN102608377A CN 102608377 A CN102608377 A CN 102608377A CN 2012100795264 A CN2012100795264 A CN 2012100795264A CN 201210079526 A CN201210079526 A CN 201210079526A CN 102608377 A CN102608377 A CN 102608377A
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CN
China
Prior art keywords
resistance
resistor
moa
amplifier
circuit
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Pending
Application number
CN2012100795264A
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Chinese (zh)
Inventor
姚建歆
徐剑
胡水莲
金琪
计杰
章健
解蕾
张弛
张鹏
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
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Shanghai Municipal Electric Power Co
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Publication date
Application filed by Shanghai Municipal Electric Power Co filed Critical Shanghai Municipal Electric Power Co
Priority to CN2012100795264A priority Critical patent/CN102608377A/en
Publication of CN102608377A publication Critical patent/CN102608377A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a reference level and lift pressure circuit used for an MOA (Metal Oxide Arrester) resistive current detection system, which comprises a resistor R11, a voltage stabilizing diode U10, a resistor R12, an electrolytic capacitor E5, a resistor R15, an amplifier U9A and an amplifier U9B, wherein the resistor R11, the resistor R12 and the resistor R15 are sequentially connected in series, the resistor R11 receives power supply voltage, and the resistor R15 is grounded; the cathode of the voltage stabilizing diode U10 is connected the connecting end of the resistor R11 and the resistor R12, and the anode of the voltage stabilizing diode U10 is grounded; one end of the electrolytic capacitor E5 is connected with the connecting end of the resistor R12 and the resistor R15, and the other end of the electrolytic capacitor E5 is grounded; and the non-inverting input terminal of the amplifier U9A is connected with the connecting end of the resistor R12 and the resistor R15, the inverting input terminal of the amplifier U9A is grounded through a resistor R10 and is connected with the output terminal of the amplifier U9A through a resistor R8, and the output terminal outputs reference level. The non-inverting input terminal of the amplifier U9B is connected with the connecting end of the resistor R12 and the resistor R15, the inverting input terminal of the amplifier U9B is grounded through a resistor R13 and is connected with the output terminal of the amplifier U9B through a resistor R16, and the output terminal outputs lift pressure level.

Description

Be used for a kind of datum of MOA current in resistance property detection system and lift volt circuit
Technical field
The present invention relates to be used for a kind of datum of MOA current in resistance property detection system and lift volt circuit.
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.Second microprocessor 21 among Fig. 1, certain model carry A/D (mould/number) converter needs a reference level signal, can't handle the negative level signal simultaneously.As shown in Figure 2; 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 "; Instrument amplifier U11 among the figure receives one and lifts voltage level, is positive level thereby the full current signal of MOA lifted.Therefore designing one, to be used to provide datum specially be the problem that needs solve with the circuit of lifting voltage level.
Summary of the invention
The datum 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 with lift volt circuit, the A/D converter that it provides datum to carry to second microprocessor in " a kind of MOA current in resistance property detection system "; Provide simultaneously and lift voltage level to the preamplifying circuit that is used for a kind of MOA current in resistance property detection system " instrument amplifier U11.
The technical scheme that realizes above-mentioned purpose is:
Be used for a kind of datum of MOA current in resistance property detection system and lift volt circuit; 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 connects second microprocessor; Said second amplifying circuit comprises preamplifying circuit, and this preamplifying circuit amplifies the MOA full current signal of flowing through and lift and is positive level;
Said datum with lift volt circuit and comprise resistance R 11, voltage stabilizing diode U10, resistance R 12, electrochemical capacitor E5, resistance R 15, amplifier U9A and amplifier U9B, wherein:
Resistance R 11, resistance R 12 and resistance R 15 are connected successively, and resistance R 11 receives supply voltage, resistance R 15 ground connection;
The negative pole of voltage stabilizing diode U10 connects the end that joins of resistance R 11 and resistance R 12, plus earth;
The end of electrochemical capacitor E5 connects the end that joins of resistance R 12 and resistance R 15, other end ground connection;
The in-phase input end of amplifier U9A connects the end that joins of resistance R 12 and resistance R 15, and inverting input connects its output terminal through resistance R 10 ground connection and through resistance R 8, output terminal output datum;
The in-phase input end of amplifier U9B connects the end that joins of resistance R 12 and resistance R 15, and inverting input connects its output terminal through resistance R 13 ground connection and through resistance R 16, and voltage level is lifted in output terminal output.
The above-mentioned datum that is used for a kind of MOA current in resistance property detection system with lift volt circuit, wherein, said electrochemical capacitor E 5 shunt capacitance C16.
The above-mentioned datum that is used for a kind of MOA current in resistance property detection system with lift volt circuit, wherein, said resistance R 15 shunt capacitance C22.
The invention has the beneficial effects as follows: the A/D converter that the present invention provides datum to carry to second microprocessor in " a kind of MOA current in resistance property detection system "; Provide simultaneously and lift the instrument amplifier U11 of voltage level to " preamplifying circuit that is used for a kind of MOA current in resistance property detection system ".
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 datum that is used for a kind of MOA current in resistance property detection system of the present invention and lift the circuit diagram of volt circuit.
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:
CVT monitor cartridge 1 comprises first microprocessor 11; And first amplifying circuit 12 that is connected respectively with this first microprocessor 11, a GPS module 13, first wireless communication module 14 and a Flash storer 15; And first holding circuit 16 that connects first amplifying circuit 12, this first holding circuit 16 connects the secondary output terminal of CVT;
MOA monitor cartridge 2 comprises second microprocessor 21; And second amplifying circuit 22 that is connected respectively with this second microprocessor 21, the 2nd GPS module 23, second wireless communication module 24, the 2nd Flash storer 25, keyboard 26 and display screen 27; And second holding circuit 28 that connects second amplifying circuit 22; This second holding circuit 28 connects the two ends of lightning stroke counter, and second amplifying circuit 22 connects second microprocessor, 21, the second microprocessors 21 and carries A/D converter.
Second amplifying circuit 22 comprises preamplifying circuit, sees also Fig. 2, and 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 23 converts said full current signal into voltage signal;
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; Voltage level is lifted in the also reception one of instrument amplifier U11, is positive level thereby will lift through the full current signal after excess current-voltage transitions and the amplification;
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, the datum that is used for a kind of MOA current in resistance property detection system of the present invention with lift volt circuit, comprise resistance R 11, voltage stabilizing diode U10, resistance R 12, electrochemical capacitor E5, resistance R 15, amplifier U9A and amplifier U9B, wherein:
Resistance R 11, resistance R 12 and resistance R 15 are connected successively, and resistance R 11 reception supply voltages, and in the present embodiment, supply voltage is 3.3V; Resistance R 15 ground connection, resistance R 15 shunt capacitance C22;
The negative pole of voltage stabilizing diode U10 connects the end that joins of resistance R 11 and resistance R 12, plus earth;
The end of electrochemical capacitor E5 connects the end that joins of resistance R 12 and resistance R 15, other end ground connection; Electrochemical capacitor E 5 shunt capacitance C16;
The in-phase input end of amplifier U9A connects the end that joins of resistance R 12 and resistance R 15; Inverting input connects its output terminal through resistance R 10 ground connection and through resistance R 8; Output terminal output reference level Vref offers the A/D converter that second microprocessor 21 carries;
The in-phase input end of amplifier U9B connects the end that joins of resistance R 12 and resistance R 15, and inverting input connects its output terminal through resistance R 13 ground connection and through resistance R 16, and voltage level VCom is lifted in output terminal output, supplies with instrument amplifier U11.
In the present embodiment, it is AD1580 that voltage stabilizing diode U10 selects model for use, and the voltage stabilizing value is 1.258V, and voltage stabilizing value maximum float is 80 μ V, and noise is 20 μ V to the maximum; It is LM321 that amplifier U9A and amplifier U9B all select model for use; Therefore, reference level Vref with lift voltage level VCom and be respectively:
V ref = 1.258 V × R 12 R 12 + R 15 × ( 1 + R 8 R 10 )
V Com = 1.258 V × R 12 R 12 + R 15 × ( 1 + R 16 R 13 )
Wherein, R12, R15, R8, R10, R16 and R13 are respectively the resistance of resistance R 12, resistance R 15, resistance R 8, resistance R 10, resistance R 16 and resistance R 13.In the present embodiment, get R12=1k Ω, R15=1k Ω, R8=3k Ω, R10=1k Ω, R16=1k Ω and R13=1k Ω, resistance all have 1%, the precision resister of 50ppm.
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 (3)

1. be used for a kind of datum of MOA current in resistance property detection system and lift volt circuit; 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 connects second microprocessor; Said second amplifying circuit comprises preamplifying circuit, and this preamplifying circuit amplifies the MOA full current signal of flowing through and lift and is positive level;
It is characterized in that, said datum with lift volt circuit and comprise resistance R 11, voltage stabilizing diode U10, resistance R 12, electrochemical capacitor E5, resistance R 15, amplifier U9A and amplifier U9B, wherein:
Resistance R 11, resistance R 12 and resistance R 15 are connected successively, and resistance R 11 receives supply voltage, resistance R 15 ground connection;
The negative pole of voltage stabilizing diode U10 connects the end that joins of resistance R 11 and resistance R 12, plus earth;
The end of electrochemical capacitor E5 connects the end that joins of resistance R 12 and resistance R 15, other end ground connection;
The in-phase input end of amplifier U9A connects the end that joins of resistance R 12 and resistance R 15, and inverting input connects its output terminal through resistance R 10 ground connection and through resistance R 8, output terminal output datum;
The in-phase input end of amplifier U9B connects the end that joins of resistance R 12 and resistance R 15, and inverting input connects its output terminal through resistance R 13 ground connection and through resistance R 16, and voltage level is lifted in output terminal output.
2. the datum that is used for a kind of MOA current in resistance property detection system according to claim 1 with lift volt circuit, it is characterized in that said electrochemical capacitor E5 shunt capacitance C16.
3. the datum that is used for a kind of MOA current in resistance property detection system according to claim 1 with lift volt circuit, it is characterized in that said resistance R 15 shunt capacitance C22.
CN2012100795264A 2012-03-22 2012-03-22 Reference level and lift pressure circuit used for MOA (Metal Oxide Arrester) resistive current detection system Pending CN102608377A (en)

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Application Number Priority Date Filing Date Title
CN2012100795264A CN102608377A (en) 2012-03-22 2012-03-22 Reference level and lift pressure circuit used for MOA (Metal Oxide Arrester) resistive current detection system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104459403A (en) * 2014-12-08 2015-03-25 重庆跃达电力有限公司 Switching value power source circuit applied to electric power circuit monitoring device

Citations (3)

* Cited by examiner, † Cited by third party
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)
CN202018473U (en) * 2010-12-22 2011-10-26 上海市电力公司 MOA (Metal Oxide Arrester) resistive-current live-monitoring device based on COMPASS (Beidou Satellite Navigation and Positioning System) synchronous timing
CN202533480U (en) * 2012-03-22 2012-11-14 上海市电力公司 Reference level and voltage step-up circuit used for MOA resistive current detection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)
CN202018473U (en) * 2010-12-22 2011-10-26 上海市电力公司 MOA (Metal Oxide Arrester) resistive-current live-monitoring device based on COMPASS (Beidou Satellite Navigation and Positioning System) synchronous timing
CN202533480U (en) * 2012-03-22 2012-11-14 上海市电力公司 Reference level and voltage step-up circuit used for MOA resistive current detection system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
孟飞: "金属氧化物避雷器泄漏电流监测仪的研制", 《电测与仪表》, vol. 46, no. 519, 31 March 2009 (2009-03-31), pages 57 - 60 *
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》, no. 12, 31 December 2010 (2010-12-31) *
高亦乐等: "基于GPS同步的金属氧化锌避雷器阻性电流和功率损耗检测系统", 《电气技术》, no. 1, 31 January 2011 (2011-01-31), pages 51 - 54 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104459403A (en) * 2014-12-08 2015-03-25 重庆跃达电力有限公司 Switching value power source circuit applied to electric power circuit monitoring device

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Owner name: STATE ELECTRIC NET CROP.

Effective date: 20121018

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Effective date of registration: 20121018

Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122

Applicant after: Shanghai Electric Power Corporation

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Applicant before: Shanghai Electric Power Corporation

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Application publication date: 20120725