CN103543319B - The measuring method of the high-precision rapid survey circuit of power system inner width range current - Google Patents

The measuring method of the high-precision rapid survey circuit of power system inner width range current Download PDF

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Publication number
CN103543319B
CN103543319B CN201310403590.8A CN201310403590A CN103543319B CN 103543319 B CN103543319 B CN 103543319B CN 201310403590 A CN201310403590 A CN 201310403590A CN 103543319 B CN103543319 B CN 103543319B
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voltage
signal
level
circuit
amplifier
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CN201310403590.8A
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Chinese (zh)
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CN103543319A (en
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黄振华
张大海
田质广
魏恒胜
郑玉实
张刚
赵秉聪
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国家电网公司
国网山东省电力公司临沂供电公司
山东大学
临沂大学
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Abstract

The invention discloses the measuring method of the high-precision rapid survey circuit of power system inner width range current, including: the current transformer being sequentially connected with, signal conditioning circuit, amplitude limiter, A/D converter and CPU, signal conditioning circuit includes the preamplifier being sequentially connected with, main amplifier, adaptive amplifier, preamplifier is connected with current transformer, adaptive amplifier is connected with amplitude limiter, node between main amplifier with adaptive amplifier is connected three branch roads, every branch road is equipped with the meansigma methods being sequentially connected with and extracts circuit, voltage comparator, meansigma methods is extracted circuit and is connected to the input of adaptive amplifier, voltage comparator is connected with multicircuit switch by the first level translator. this circuit has the automatic electric-level of multilevel voltage comparator and differentiates and coding circuit, it is possible to automatically select suitable feedback resistance and amplification for amplifier, has measuring speed faster while improving wide range current signal measurement precision.

Description

The measuring method of the high-precision rapid survey circuit of power system inner width range current

Technical field

The present invention relates to for power system simulation measurement field, particularly relate to the measuring method of the high-precision rapid survey circuit of power system inner width range current.

Background technology

The electric current of power system is the important parameter of reflection operation states of electric power system; power system needs to obtain current value to carry out the various analytical calculations of power system when properly functioning; also current value is obtained to realize the various relay protection function safety with protection system and equipment during fault, so one of current measure device required equipment that is power system. But owing to size of current is affected by subscriber equipment working condition, current value excursion when properly functioning is very big. Common survey equipment can only ensure to have relatively high measurement accuracy near current rating, and certainty of measurement can reduce when current value change in wide scope. The research equipment for the electric current from the zero to the even broader scope of rated value all being had relatively high measurement accuracy, significant and practical value.

In order to realize, in wide scope, there is higher current measurement precision, the solution of current power domain is to adopt two set circuit, and circuit kit is responsible for providing supervision and metering current value, and its precision is significantly high, but it is little to adapt to current range, it is common that zero arrives rated current;Another set of circuit is responsible for the current value providing protection to need, and the former is slightly worse for its ratio of precision, but it is big to adapt to current range, it is possible to be zero to tens times of rated current.

In industrial instrument field, automatic range technology can be adopted at present to improve the certainty of measurement of wide range signal. Its cardinal principle is first signal to be carried out preliminary surveying, estimates its substantially numerical value, then adjusts the amplification of amplifier accordingly, so as to reach best coupling with the range of A/D converter, thus improving certainty of measurement. But the program needs software and hardware to coordinate performs twice at even repetitive measurement to signal, it is necessary to progressively attempts reaching best magnification, therefore have impact on measuring speed.

Technical problem is that sum it up, be presently required one that those skilled in the art urgently solve: how can realize the measurement of wide range current signal accurately and quickly.

Summary of the invention

The purpose of the present invention is contemplated to solve the problems referred to above, it is provided that the measuring method of the high-precision rapid survey circuit of power system inner width range current. The basic thought of the present invention is also the certainty of measurement improving wide range current signal by adjusting the amplification of amplifier, but the improvement is that and current signal numerical range is judged not by A/D conversion and software estimation, but be automatically performed by hardware voltage comparator, therefore the present invention can fully rely on hardware circuit and be automatically adjusted to best magnification, it is only necessary to one-shot measurement just obtains the exact value of electric current. So not only reach the accurate measurement requirement to wide range current, and substantially increase measuring speed.

To achieve these goals, the present invention adopts the following technical scheme that

The high-precision rapid survey circuit of power system inner width range current, including: current transformer, described current transformer is transferred to signal conditioning circuit after power current is transformed into small area analysis signal, signal conditioning circuit becomes voltage signal after being nursed one's health by current signal and is transferred to amplitude limiter, described amplitude limiter transmits a signal to A/D converter, and described A/D converter transfers data to CPU (central processing unit) after signal is carried out analog digital conversion;

Described signal conditioning circuit includes: preamplifier, current signal is converted to voltage signal and sends into main amplifier by described preamplifier, main amplifier sends into adaptive amplifier after being amplified further by signal, the signal of adaptive amplifier can be transferred to amplitude limiter, the signal that main amplifier amplifies further simultaneously also can extract circuit through three meansigma methodss, the average voltage obtained after extracting circuit by three meansigma methodss is transferred to three voltage comparators respectively, by three voltage comparators relatively after, three voltage comparators export high/low level respectively, and respectively high/low level is transferred to two level translators, wherein the signal after conversion is transferred to multicircuit switch by the first level translator, described multicircuit switch also receives the output of adaptive amplifier. signal after conversion is transferred to CPU by second electrical level transducer.

Described meansigma methods is extracted circuit and is included three branch roads in parallel, Article 1, branch road and Article 2 branch road are equipped with two diodes connected, Article 3 branch road is provided with electric capacity C, the positive pole of the first diode D1 on described Article 1 branch road meets input Vin1, the positive pole of described first diode D1 is also connected with the negative pole of the 3rd diode, the negative pole of described first diode D1 connects outfan, the plus earth of described 3rd diode D3, the positive pole of the second diode D2 on described Article 2 branch road meets input Vin2, the positive pole of described second diode D2 is also connected with the negative pole of the 4th diode D4, the negative pole of described second diode D2 connects outfan, the plus earth of described 4th diode D4, the two ends of described electric capacity C are ground connection and outfan respectively.

Each described level translator includes three identical level shifting circuits, every level shifting circuit is provided with audion, the base stage of described audion is connected with input by the first resistance, the grounded emitter of described audion, the colelctor electrode of described audion connects power supply (wherein by the second resistance, first level translator connects power vd D, and second electrical level transducer connects power supply VCC), the colelctor electrode of described audion is connected with outfan.

The measuring method that described measuring circuit adopts, is broadly divided into following steps:

Step one: the current signal I1 in power system is transformed to small area analysis signal I2 by current transformer, sends into signal conditioning circuit;

Step 2: current signal I2 is converted to voltage signal Vo1 and sends into main amplifier, main amplifier is responsible for Vo1 being enlarged into voltage signal Vo2 further and being sent to adaptive amplifier; Meanwhile, voltage signal Vo2, through processing, obtains average voltage | Vo2 | corresponding for voltage signal Vo2 and sends into three voltage comparators afterwards, generate three position digital codings after three voltage comparators are relatively;

Step 3: after described three position digital codings are converted to the level of applicable multicircuit switch, is admitted to three gating ends of multicircuit switch; This makes it possible to the output result according to three voltage comparators and automatically select suitable feedback resistance for adaptive amplifier, be also selected by suitable voltage amplification factor simultaneously, made adaptive amplifier output voltage signal Vo3;

Step 4: the voltage signal Vo3 of adaptive amplifier output sends into A/D converter through amplitude limiter, and analog quantity is converted to digital quantity by A/D converter, and digital quantity sends into CPU; Meanwhile, three position digital codings of three voltage comparator outputs send into three digital quantity inputs of CPU after being converted to the level of applicable CPU, obtain feedback resistance and amplification that current adaptive amplifier connects, so that CPU calculates current value accurately.

In described step 2, the specific works step of voltage comparator is as follows: these three voltage comparator is respectively provided with different threshold voltage Vd1, Vd2, and Vd3;

Compare with threshold voltage Vd1 by average voltage | Vo2 | being sent into the first voltage comparator, if | Vo2 | > Vd1, then the first voltage comparator output high level; Otherwise its output low level;

| Vo2 | is respectively fed to the second voltage comparator compare with threshold voltage Vd2, if | Vo2 | > Vd2, then the second voltage comparator output high level; Otherwise its output low level;

| Vo2 | is respectively fed to tertiary voltage comparator compare with threshold voltage Vd3, if | Vo2 | > Vd3, then tertiary voltage comparator output high level; Otherwise its output low level;

3 level of such three voltage comparators output form three position digital codings.

Current signal I1 in described step one is transformed to small area analysis signal I2 through current transformer.

In signal conditioning circuit in described step 2, current signal I2 is converted to voltage signal Vo1 by preamplifier.

In described step 2, voltage signal Vo2 extracts processing of circuit through meansigma methods, obtains average voltage | Vo2 | corresponding for voltage signal Vo2 and sends into three voltage comparators afterwards.

Three position digital codings of described step 3 are converted to the level of applicable multicircuit switch through the first level translator.

Three position digital codings of described three voltage comparators output, through second electrical level transducer, are converted to the level of applicable CPU.The present invention it is critical only that, for solving the high-acruracy survey problem of wide range current, use for reference instrument auto range circuit principle, devise with multilevel voltage comparator be characteristic automatic electric-level differentiate and coding circuit, being entirely through hardware is that amplifier automatically selects suitable feedback resistance and amplification, it is possible to the voltage signal that quickly output is suitable is to A/D converter.

The invention has the beneficial effects as follows:

1, when solving wide range current and measuring problem, configuring multiple different feedback resistances for adaptive amplifier, it is possible to automatically select suitable feedback resistance according to the level of input voltage signal, adjusting the amplification of amplifier, thus improving certainty of measurement.

2, by arranging multiple voltage comparator, adjust amplification again and carry out final A/D conversion after need not first carrying out one or many A/D conversion and software estimation as traditional method, but utilize the automatic electric-level of devices at full hardware to differentiate and adjust amplification with coding circuit is disposable, thus there is measuring speed faster while improving certainty of measurement.

3, when the present invention introduces measuring method for succinctly understandable be for three voltage comparators, but actual also being able to support more voltage comparator, thus improving certainty of measurement further, therefore there is good autgmentability and application value.

Accompanying drawing explanation

Fig. 1 principles of the invention schematic diagram;

Fig. 2 embodiments of the invention figure;

Fig. 3 meansigma methods extracts circuit diagram;

Fig. 4 the first level translator schematic diagram;

Fig. 5 second electrical level transducer schematic diagram;

Wherein, 1, current transformer, 2, preamplifier, 3, main amplifier, 4, adaptive amplifier, 5, amplitude limiter, 6, A/D converter, 7, CPU, 8, meansigma methods extract circuit, 9, voltage comparator, the 10, first level translator, 11, multicircuit switch, 12, second electrical level transducer.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described with embodiment.

As illustrated in fig. 1 and 2, the high-precision rapid survey circuit of power system inner width range current, including: current transformer 1, signal conditioning circuit, amplitude limiter 5, A/D converter 6 and the CPU7 being sequentially connected with,

Preamplifier 2 that described signal conditioning circuit includes being sequentially connected with, main amplifier 3, adaptive amplifier 4, described preamplifier 2 is connected with current transformer 1, and described adaptive amplifier 4 is connected with amplitude limiter 5,

Node between described main amplifier 3 and adaptive amplifier 4 is connected three branch roads, every branch road is equipped with the meansigma methods being sequentially connected with and extracts circuit 8, voltage comparator 9, wherein said meansigma methods is extracted circuit 8 and is connected to the input of adaptive amplifier 4, voltage comparator 9 is connected with multicircuit switch 11 by the first level translator 10, and multicircuit switch 11 is connected with the outfan of adaptive amplifier 4; Each voltage comparator 9 is connected with CPU7 also by second electrical level transducer 12.

As shown in Figure 3, described meansigma methods is extracted circuit 8 and is included three branch roads in parallel, Article 1, branch road and Article 2 branch road are equipped with two diodes connected, Article 3 branch road is provided with electric capacity C, the positive pole of the first diode D1 on described Article 1 branch road meets input Vin1, the positive pole of described first diode D1 is also connected with the negative pole of the 3rd diode, the negative pole of described first diode D1 connects outfan, the plus earth of described 3rd diode D3, the positive pole of the second diode D2 on described Article 2 branch road meets input Vin2, the positive pole of described second diode D2 is also connected with the negative pole of the 4th diode D4, the negative pole of described second diode D2 connects outfan, the plus earth of described 4th diode D4, the two ends of described electric capacity C are ground connection and outfan respectively.

As shown in Figure 4 and Figure 5, each described level translator includes three identical level shifting circuits, every level shifting circuit is provided with audion, the base stage of described audion is connected with input by the first resistance, the grounded emitter of described audion, the colelctor electrode of described audion connects power supply by the second resistance, and (wherein, the first level translator connects power vd D, second electrical level transducer connects power supply VCC), the colelctor electrode of described audion is connected with outfan.

The measuring method that the high-precision rapid survey circuit of power system inner width range current adopts, is broadly divided into following steps:

Step one: the line current signal I1 in power system is reduced to small area analysis signal I2 (mA level) through current transformer 1 conversion, sends into signal conditioning circuit;

Step 2: mainly include three operational amplifier OP07 (being followed successively by preamplifier 2, main amplifier 3 and adaptive amplifier 4 from front to back), a three voltage comparator LM311 and multicircuit switch CD4051 in signal conditioning circuit. Wherein current signal I2 is converted to voltage signal Vo1 and sends into main amplifier 3 by preamplifier. Main amplifier 3 is responsible for Vo1 being enlarged into voltage signal Vo2 further and being sent to adaptive amplifier 4. Simultaneously, voltage signal Vo2 extracts circuit 8 (see Fig. 3) through meansigma methods and processes, obtain meansigma methods | Vo2 | corresponding for AC signal Vo2 and send into three voltage comparators 9 afterwards, these three voltage comparator 9 is respectively provided with different threshold voltage Vd1=5V, Vd2=2V, and Vd3=0.5V. Voltage | Vo2 | being sent into voltage comparator 9 compare with threshold voltage Vd1, if | Vo2 | > Vd1, then the first voltage comparator U1 exports high level; Otherwise its output low level. Similarly, | Vo2 | is respectively fed to the second voltage comparator U2 and Vd2 compare, sending into tertiary voltage comparator U3 and Vd3 to compare, U2 and U3 can export high level or low level according to comparative result correspondence, and 3 level of such three voltage comparators 9 output form tri-bit encoding;

Step 3: the tri-bit encoding of three voltage comparators 9 output through level shifting circuit 1 (see Fig. 4, wherein VDD=+12V), after being converted to the level of applicable multicircuit switch 11, it is admitted to three gating ends (A, B, C end) of multicircuit switch CD4051. Multicircuit switch 11 is outside eight tunnel inputs and road output, and there are eight switches inside, it is possible to selects a switch Guan Bi switching from eight according to the coding of three gating ends difference, selects a road connection in Ji Cong eight tunnel. Such as when tri-bit encoding is 000, connection resistance R0, and R0 resistance is R11 10 times, i.e. amplification=10 of adaptive amplifier 4; And when tri-bit encoding is 111, connect resistance R7, and R7 and R11 resistance is equal, i.e. amplification=1. Thus automatically can select suitable feedback resistance for adaptive amplifier 4 according to the output result of three voltage comparators 9, also be selected by suitable voltage amplification factor simultaneously, made adaptive amplifier 4 output voltage signal Vo3. Owing to follow-up A/D converter 6 supports to input the voltage signal of positive and negative 10V, therefore by the purpose of adjustment amplification be the peak value making Vo3 less than positive and negative 10V but close to positive and negative 10V, to obtain optimum measurement precision;

Step 4: the voltage signal Vo3 of adaptive amplifier 4 output is admitted to the analog input end of A/D converter 6 (AD1674) below through the amplitude limiter 5 that diode is constituted.AD1674 passes through 14 foot input analog amounts, and is converted into corresponding digital quantity, and it is embedded controller 80C196 that digital quantity sends into CPU7, CPU7 here by 12 bit data bus DB0~DB11. Simultaneously, the tri-bit encoding signal of three voltage comparators 9 output through level shifting circuit 2 (see Fig. 5, wherein VCC=+5V), be converted to the 0 of applicable CPU7 after+5V level, send into three digital quantity inputs of CPU7, inform feedback resistance and the amplification of the current adjustable amplifier connection of CPU7, make CPU7 can be multiplied by amplification according to the A/D conversion digital quantity obtained and calculate current value accurately.

The specific embodiment of the present invention is described in conjunction with accompanying drawing although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme, those skilled in the art need not pay various amendments or deformation that creative work can make still within protection scope of the present invention.

Claims (1)

1. the measuring method of the high-precision rapid survey circuit of power system inner width range current, is characterized in that, measuring circuit includes:
Current transformer, described current transformer is transferred to signal conditioning circuit after power current is transformed into small area analysis signal, signal conditioning circuit is transferred to amplitude limiter after current signal conditioning is converted to voltage signal, described amplitude limiter transmits a signal to A/D converter, and described A/D converter transfers data to CPU after electric current is carried out analog digital conversion;
Described signal conditioning circuit includes: preamplifier OP07, current signal is converted to voltage signal and sends into main amplifier OP07 by described preamplifier OP07, main amplifier OP07 sends into adaptive amplifier OP07 after being amplified further by signal, the signal of adaptive amplifier OP07 can be transferred to amplitude limiter, the signal that main amplifier OP07 amplifies further simultaneously also can extract circuit through three meansigma methodss, the average voltage obtained after extracting circuit by three meansigma methodss is transferred to three voltage comparators respectively, by three voltage comparators relatively after, three voltage comparators export high/low level respectively, and respectively high/low level is transferred to two level translators, wherein the signal after conversion is transferred to multicircuit switch CD4051 by the first level translator, described multicircuit switch CD4051 is also received from the output adapting to Amplifier OP07, automatically amplification is adjusted for adaptive amplifier OP07, signal after conversion is transferred to CPU by second electrical level transducer,
Described meansigma methods is extracted circuit and is included three branch roads in parallel, Article 1, branch road and Article 2 branch road are equipped with two diodes connected, Article 3 branch road is provided with electric capacity C, the positive pole of the first diode D1 on described Article 1 branch road meets input Vin1, the positive pole of described first diode D1 is also connected with the negative pole of the 3rd diode D3, the negative pole of described first diode D1 connects outfan, the plus earth of described 3rd diode D3, the positive pole of the second diode D2 on described Article 2 branch road meets input Vin2, the positive pole of described second diode D2 is also connected with the negative pole of the 4th diode D4, the negative pole of described second diode D2 connects outfan, the plus earth of described 4th diode D4, the two ends of described electric capacity C are ground connection and outfan respectively,
Each described level translator includes three identical level shifting circuits, every level shifting circuit is provided with audion, the base stage of described audion is connected with input by the first resistance, the grounded emitter of described audion, the colelctor electrode of described audion connects power supply by the second resistance, and the colelctor electrode of described audion is connected with outfan;
Method is divided into following steps:
Step one: through current transformer, the current signal I1 in power system is transformed to small area analysis signal I2, sends into signal conditioning circuit;
Step 2: in signal conditioning circuit, current signal I2 is converted to voltage signal Vo1 and sends into main amplifier by preamplifier, main amplifier is responsible for Vo1 being enlarged into voltage signal Vo2 further and being sent to adaptive amplifier; Meanwhile, voltage signal Vo2 extracts processing of circuit through meansigma methods, obtains average voltage | Vo2 | corresponding for voltage signal Vo2 and sends into afterwards three voltage comparators, through three voltage comparators relatively after generation three position digital codings; The specific works step of voltage comparator is as follows: these three voltage comparator is respectively provided with different threshold voltage Vd1, Vd2 and Vd3;
Compare with threshold voltage Vd1 by average voltage | Vo2 | being sent into the first voltage comparator, if | Vo2 | > Vd1, then the first voltage comparator output high level; Otherwise its output low level;
| Vo2 | is respectively fed to the second voltage comparator compare with threshold voltage Vd2, if | Vo2 | > Vd2, then the second voltage comparator output high level; Otherwise its output low level;
| Vo2 | is respectively fed to tertiary voltage comparator compare with threshold voltage Vd3, if | Vo2 | > Vd3, then tertiary voltage comparator output high level; Otherwise its output low level;
3 level of such three voltage comparators output form three position digital codings;
Step 3: described three position digital codings, after the level that the first level translator is converted to applicable multicircuit switch, are admitted to three gating ends of multicircuit switch; This makes it possible to the output result according to three voltage comparators and automatically select suitable feedback resistance for adaptive amplifier, be also selected by suitable voltage amplification factor simultaneously, made adaptive amplifier output voltage signal Vo3;
Step 4: the voltage signal Vo3 of adaptive amplifier output sends into A/D converter through amplitude limiter, and analog quantity is converted to digital quantity by A/D converter, and digital quantity sends into CPU; Simultaneously, three position digital codings of three voltage comparator outputs are after the level that second electrical level transducer is converted to applicable CPU, send into three digital quantity inputs of CPU, obtain feedback resistance and amplification that the current adaptive amplifier of CPU connects, thus CPU calculates current value accurately.
CN201310403590.8A 2013-09-06 2013-09-06 The measuring method of the high-precision rapid survey circuit of power system inner width range current CN103543319B (en)

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