CN101672866A - Comprehensive detecting and marking system of Faraday magneto-optical effect current mutual inductor - Google Patents

Abstract

The invention discloses a comprehensive detecting and marking system of a Faraday magneto-optical effect current mutual inductor, comprising a secondary transmitting unit, a digital decoding unit, ananalogue information combining unit, a digital information combining unit, a mark comparing unit and a GPS receiver supplying a time reference. The secondary transmitting unit is used for converting secondary current information f0 output from a Faraday electromagnetic induction current mutual inductor into a small current through a transformer; and the small current is converted into a voltage signal f31 after passing through a resistor and the voltage signal f31 is transmitted to the analogue information combining unit. The digital decoding unit is used for receiving a communication code digital quantity D0 output from the Faraday magneto-optical effect current mutual inductor. The comprehensive detecting and marking system brings the information output from two current mutual inductorswith different theories into the same detecting system, and makes use of the time of the GPS receiver as a marking reference to solve the problem that the Faraday magneto-optical effect current mutualinductor cannot be marked by utilizing the Faraday electromagnetic induction current mutual inductor due to different time information.

Description

A kind of Faraday magneto-optical effect current mutual inductor comprehensive detection and calibration system

Technical field

The present invention relates to a kind of comprehensive detection and calibration system that is applicable to Faraday magneto-optical effect current mutual inductor, in more detail, be meant a kind of system that can utilize Faradic electricity induced field current mutual inductor that Faraday magneto-optical effect current mutual inductor is detected and demarcates.

Background technology

The principle of work of Faraday magneto-optical effect current mutual inductor is: utilize the Faraday magneto-optical principle of induction that the big electric current displacement of current mutual inductor coil primary side is output as with 0; the digital signal of 1 expression; and this digital signal is only relevant with the current amplitude of a bus bar side; and for electric system; except current amplitude; the time that produces this current amplitude is also extremely important; no matter be for electric protection device or for electric power metering device, the time all is extremely important information.Just can in electric system, be applied so the amplitude information of Faraday magneto-optical effect current mutual inductor output must be combined with the temporal information that produces this amplitude information.

The principle of work of Faradic electricity induced field current mutual inductor is: utilize the Faradic electricity magnetic induction principle that the big electric current of current mutual inductor coil primary side is replaced into the little electric current of secondary side according to the needs that use, power supply is tried hard to keep to protect with measuring apparatus and is used.The electric current of this moment also only has the amplitude of simulation, demarcates when its corresponding temporal information is computer sampling.

In sum, as can be seen because Faraday magneto-optical effect current mutual inductor is different with the ultimate principle of Faradic electricity induced field current mutual inductor, so can't use the latter that the former is detected and demarcates according to general method, therefore, after patented claim of the present invention is incorporated into the time standard of GPS receiver in the signal of these two kinds of current transformers, the electric current output of the current transformer of these two kinds of different principle has just had the unified time standard, thereby can carry out relevant detection and staking-out work.

Summary of the invention

In order to realize of the demarcation of Faradic electricity induced field current mutual inductor to Faraday magneto-optical effect current mutual inductor, the present invention is incorporated into the current transformer output information of these two kinds of different principle in the same detection system, the time of utilizing the GPS receiver is as the benchmark of demarcating, to solve because the inconsistent problem that can't utilize Faradic electricity induced field current mutual inductor to remove to demarcate Faraday magneto-optical effect current mutual inductor of temporal information.The integrated information of the comprehensive detection of the present invention's design and calibration system can carry out two kinds of different principle in practical power systems such as transformer station or power plant current transformer detects.

A kind of Faraday magneto-optical effect current mutual inductor comprehensive detection of the present invention and calibration system, this detection and calibration system include secondary transducing unit, digital decoding unit, analog information integrated unit, numerical information integrated unit, demarcate comparing unit, and the GPS receiver that time reference is provided;

Described secondary transducing unit is made of transformer and resistance, and this secondary transducing unit is used for the secondary current information f with the output of first measurand ₀Convert little electric current to by transformer, this little electric current converts voltage signal f to behind resistance ₃₁Give the analog information integrated unit;

Described GPS receiver be used to provide reference time t ₃, this reference time t ₃Respectively as nominal time of first measurand and second measurand;

Described digital decoding unit is used to receive the communication identification code digital quantity D of second measurand output on the one hand ₀Communication identification code digital quantity D to receiving on the other hand ₀Carry out binary decoded, obtain the digital current information f after the decoding ₃₂At last with the digital current information f ₃₂Export to the numerical information integrated unit;

Described analog information integrated unit receives voltage signal f on the one hand ₃₁Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, voltage signal f ₃₁As ordinate, fit to the bus primary side current information f that has the time ₃₃

Described numerical information integrated unit receives the digital current information f on the one hand ₃₂Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, the digital current information f ₃₂As ordinate, fit to the bus primary side current information f that has the time ₃₄

The f of described demarcation comparing unit to receiving ₃₃And f ₃₄Carry out stable state and transient information relatively, thereby obtain detecting and calibration information.

A kind of Faraday magneto-optical effect current mutual inductor comprehensive detection of the present invention and calibration system advantage are:

1, by introducing t reference time of GPS receiver ₃Solved difficult alignment issues of time in the current transformer of two kinds of different principle.Little, the compact conformation of this comprehensive detection system loss can make full use of the space, has improved the stability and the life-span of system.

2, in demarcating comparing unit, carry out the comparison of transient state and stable state information, obtained a plurality of performance parameters comparatively easily.

3, employing time and electric current formed coordinate concern, but can embody the comparative between Faraday magneto-optical effect current mutual inductor and the Faradic electricity induced field current mutual inductor.

Description of drawings

Fig. 1 is the Faraday magneto-optical effect current mutual inductor comprehensive detection among the present invention and the structured flowchart of calibration system.

Fig. 2 is the schematic diagram of permute unit among the present invention.

Fig. 3 is by the current waveform output interface after the system handles of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

Referring to shown in Figure 1, in the present invention, Faradic electricity induced field current mutual inductor is called first measurand 1, Faraday magneto-optical effect current mutual inductor is called second measurand 2.

For second measurand 2, the communication identification code digital quantity D of its output ₀Be expressed as the digital quantity (binary code) of a bus bar side electric current as 0,1; Its calibration process be unable to do without with first measurand 1 and compares.

For first measurand 1, the secondary current information f of its output ₀It is analog quantity electric current with a bus bar side electric current.

Referring to shown in Figure 1, a kind of Faraday magneto-optical effect current mutual inductor comprehensive detection of the present invention and calibration system, this system includes secondary transducing unit 31, digital decoding unit 32, analog information integrated unit 33, numerical information integrated unit 34, demarcates comparing unit 35, and the GPS receiver 3 that time reference is provided.

Referring to shown in Figure 2, secondary transducing unit 31 is made of transformer and resistance, and this secondary transducing unit 31 is used for the secondary current information f with 1 output of first measurand ₀Convert little electric current to by transformer, this little electric current converts voltage signal f to behind resistance ₃₁Give analog information integrated unit 33.

GPS receiver 3 be used to provide reference time t ₃, this reference time t ₃Respectively as nominal time of first measurand 1 and second measurand 2.Reference time t ₃The horizontal ordinate that while also shows as information among Fig. 3." electric current I 1 " refers to the electric current of faraday's em induced current mutual inductor output among Fig. 3, and " electric current I 2 " refers to the electric current of Faraday magneto-optical effect current mutual inductor output.Current unit is an ampere (A), and the chronomere of horizontal ordinate is (ms).

Digital decoding unit 32 is used to receive the communication identification code digital quantity D of second measurand, 2 outputs on the one hand ₀Communication identification code digital quantity D to receiving on the other hand ₀Carry out binary decoded, the agreement of decoding is D ₀Data are totally 6 bytes, and first byte is a frame head, is fixed as 80; Last byte is a postamble, is fixed as FE; Second to the 4th byte is that (data bit of second byte is designated as data 1 to data bit, the data bit of the 3rd byte is designated as data 2, the data bit of nybble is designated as data 3), the 5th byte is check bit, the value of check bit be second to the 4th byte data bit add up and, that is: check bit=data 1+ data 2+ data 3; Obtain the digital current information f after the decoding ₃₂At last with the digital current information f ₃₂Export to numerical information integrated unit 34.

Analog information integrated unit 33 receives voltage signal f on the one hand ₃₁Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, voltage signal f ₃₁As ordinate (as shown in Figure 3), fit to the bus primary side current information f that has the time ₃₃(left side curve among Fig. 3).In the present invention, f ₃₃Be also referred to as first current information.

Numerical information integrated unit 34 receives the digital current information f on the one hand ₃₂Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, the digital current information f ₃₂As ordinate, fit to the bus primary side current information f that has the time ₃₄(the right curve among Fig. 3).In the present invention, f ₃₄Be also referred to as second current information.

Demarcate the first current information f of 35 pairs of receptions of comparing unit ₃₃With the second current information f ₃₄Carry out stable state and transient information relatively, thereby obtain demarcating current information.

In the present invention, stable state and transient information relatively include the following step:

Step 1: the current effective value of first measurand 1 extracts

N current sampling data to 1 output of first measurand is designated as I respectively _A1, I _A2..., I _AN, wherein the maximum current sampled value is designated as I _Amax, the minimum current sampled value is designated as I _AminI _A1First current sampling data of representing first measurand 1, I _A2Second current sampling data representing first measurand 1, I _ANN current sampling data representing first measurand 1.

Then there is the current effective value of first measurand 1 to be $I_A=\sqrt{\frac{1}{N}({I_{\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="A2009100933980009H1.png"\; state="\{\{state\}\}">A</figure-callout>}1}}^2+{I_{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="A2009100933980009H1.png"\; state="\{\{state\}\}">A</figure-callout>}2}}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{I_{\mathrm{AN}}}^2)}.$

Step 2: the current effective value of second measurand 2 extracts

N current sampling data to 2 outputs of second measurand is designated as I respectively _D1, I _D2..., I _DN, wherein the maximum current sampled value is designated as I _Dmax, the minimum current sampled value is designated as I _DminI _D1First current sampling data of representing second measurand 2, I _D2Second current sampling data representing second measurand 2, I _DNN current sampling data representing second measurand 2.

Then there is the current effective value of second measurand 2 to be $I_D=\sqrt{\frac{1}{N}({{\mathrm{<figure-callout\; id="1"\; label="I\; D"\; filenames="A2009100933980009H1.png"\; state="\{\{state\}\}">I</figure-callout>}}_D}^2+{{\mathrm{<figure-callout\; id="2"\; label="I\; D"\; filenames="A2009100933980009H1.png"\; state="\{\{state\}\}">I</figure-callout>}}_D}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{I_{\mathrm{DN}}}^2)}.$

Step 3: relative performance parameter extraction

(a) the tested current effective value relative error of second measurand 2 and first measurand 1 $\mathrm{\&Delta;I}=\frac{I_D-I_A}{I_A}\&times;100\%.$

(b) the maximum tested current value relative error of second measurand 2 and first measurand 1 ${\mathrm{\&Delta;I}}_{\max }=\frac{I_{D\max }-I_{A\max }}{I_{A\max }}\&times;100\%.$

(c) the minimum tested current value relative error of second measurand 2 and first measurand 1 ${\mathrm{\&Delta;I}}_{\min }=\frac{I_{D\min }-I_{A\min }}{I_{A\min }}\&times;100\%.$

(d) the sampled value sequence mean square deviation of second measurand 2 and first measurand 1 $\mathrm{\&Delta;F}=\frac{1}{N}[{(I_{D1}-I_{A1})}^2+{(I_{D2}-I_{A2})}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{(I_{\mathrm{DN}}-I_{\mathrm{AN}})}^2].$

(e) the sampled value sequence relative mean square deviation of second measurand 2 and first measurand 1 $\mathrm{\&Delta;H}=\frac{1}{I_A}\sqrt{\frac{1}{N}[{(I_{D1}-I_{A1})}^2+{(I_{D2}-I_{A2})}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{(I_{\mathrm{DN}}-I_{\mathrm{AN}})}^2]}\&times;100\%.$

In the present invention, the current information through demarcating comparing unit 35 outputs just can be used for carrying out Faraday magneto-optical effect current mutual inductor is carried out the demarcation usefulness of product.

A kind of Faraday magneto-optical effect current mutual inductor comprehensive detection and the calibration system of the present invention's design are the temporal information t with the GPS receiver ₃Be incorporated in the current transformer of two kinds of different principle, the amplitude information that second measurand 2 is produced is corresponding one by one with gps time information, has solved the time standard problem that second measurand 2 exists in operation and testing process.Equally, native system is also simulated little electric current f with the secondary that first measurand 1 produces ₀With gps time information t ₃Carry out mark.So just can be implemented in the comparison of under the same time standard current transformer of two kinds of different principle being carried out various instantaneous values, mean value and statistic.Make the demarcation and the detection of the precise information in the whole working time be achieved.

Claims (6)

1, a kind of Faraday magneto-optical effect current mutual inductor comprehensive detection and calibration system, it is characterized in that: this detection and calibration system include secondary transducing unit (31), digital decoding unit (32), analog information integrated unit (33), numerical information integrated unit (34), demarcate comparing unit (35), and the GPS receiver (3) that time reference is provided;

Described secondary transducing unit (31) is made of transformer and resistance, and this secondary transducing unit (31) is used for the secondary current information f with first measurand (1) output ₀Convert little electric current to by transformer, this little electric current converts voltage signal f to behind resistance ₃₁Give analog information integrated unit (33);

Described GPS receiver (3) be used to provide reference time t ₃, this reference time t ₃Respectively as nominal time of first measurand (1) and second measurand (2);

Described digital decoding unit (32) is used to receive the communication identification code digital quantity D of second measurand (2) output on the one hand ₀Communication identification code digital quantity D to receiving on the other hand ₀Carry out binary decoded, obtain the digital current information f after the decoding ₃₂At last with the digital current information f ₃₂Export to numerical information integrated unit (34);

Described analog information integrated unit (33) receives voltage signal f on the one hand ₃₁Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, voltage signal f ₃₁As ordinate, fit to the bus primary side current information f that has the time ₃₃

Described numerical information integrated unit (34) receives the digital current information f on the one hand ₃₂Receive t reference time on the other hand ₃At last with t reference time ₃As horizontal ordinate, the digital current information f ₃₂As ordinate, fit to the bus primary side current information f that has the time ₃₄

The f of described demarcation comparing unit (35) to receiving ₃₃And f ₃₄Carry out stable state and transient information relatively, thereby obtain detecting and calibration information.

2, Faraday magneto-optical effect current mutual inductor comprehensive detection according to claim 1 and calibration system is characterized in that: demarcate middle stable state of comparing unit (35) and transient information and relatively include the following step:

Step 1: the current effective value of first measurand (1) extracts

N current sampling data to first measurand (1) output is designated as I respectively _A1, I _A2..., I _AN, wherein the maximum current sampled value is designated as I _Amax, the minimum current sampled value is designated as I _Amin

I _A1First current sampling data of representing first measurand (1),

I _A2Second current sampling data representing first measurand (1),

I _ANN current sampling data representing first measurand (1);

Then there is the current effective value of first measurand (1) to be $I_A=\sqrt{\frac{1}{N}({I_{A1}}^2+{I_{A2}}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{I_{\mathrm{AN}}}^2)};$

Step 2: the current effective value of second measurand (2) extracts

N current sampling data to second measurand (2) output is designated as I respectively _D1, I _D2..., I _DN, wherein the maximum current sampled value is designated as I _Dmax, the minimum current sampled value is designated as I _Dmin

I _D1First current sampling data of representing second measurand (2),

I _D2Second current sampling data representing second measurand (2),

I _DNN current sampling data representing second measurand (2);

Then there is the current effective value of second measurand (2) to be $I_D=\sqrt{\frac{1}{N}({I_{D1}}^2+{I_{D2}}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{I_{\mathrm{DN}}}^2)};$

Step 3: relative performance parameter extraction

The tested current effective value relative error of second measurand (2) and first measurand (1) $\mathrm{\&Delta;I}=\frac{I_D-I_A}{I_A}\&times;100\%;$

The maximum tested current value relative error of second measurand (2) and first measurand (1) $\mathrm{\&Delta;}{I}_{\max }=\frac{I_{D\max }-I_{A\max }}{I_{A\max }}\&times;100\%;$

The minimum tested current value relative error of second measurand (2) and first measurand (1) $\mathrm{\&Delta;}{I}_{\min }=\frac{I_{D\min }-I_{A\min }}{I_{A\min }}\&times;100\%;$

The sampled value sequence mean square deviation of second measurand (2) and first measurand (1) $\mathrm{\&Delta;F}=\frac{1}{N}[{(I_{D1}-I_{A1})}^2+{(I_{D2}-I_{A2})}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{(I_{\mathrm{DN}}-I_{\mathrm{AN}})}^2];$

The sampled value sequence relative mean square deviation of second measurand (2) and first measurand (1) $\mathrm{\&Delta;H}=\frac{1}{I_A}\sqrt{\frac{1}{N}[{(I_{D1}-I_{A1})}^2+{(I_{D2}-I_{A2})}^2+\&CenterDot;\&CenterDot;\&CenterDot;+{(I_{\mathrm{DN}}-I_{\mathrm{AN}})}^2]}\&times;100\%.$

3, Faraday magneto-optical effect current mutual inductor comprehensive detection according to claim 1 and calibration system is characterized in that: digital decoding unit (32) communication identification code digital quantity D to receiving ₀The agreement of decoding is D ₀Data are totally 6 bytes, and first byte is a frame head, is fixed as 80; Last byte is a postamble, is fixed as FE; Second to the 4th byte is data bit, and the 5th byte is check bit, its value for the first three data position adding up and.

4, Faraday magneto-optical effect current mutual inductor comprehensive detection according to claim 1 and calibration system is characterized in that: t reference time that utilizes GPS receiver (3) output ₃As the horizontal ordinate of electric current output, the current amplitude of second measurand (2) and first measurand (1) output is as ordinate.

5, Faraday magneto-optical effect current mutual inductor comprehensive detection according to claim 1 and calibration system is characterized in that: with faraday's em induced current mutual inductor Faraday magneto-optical effect current mutual inductor is demarcated.

6, Faraday magneto-optical effect current mutual inductor comprehensive detection according to claim 1 and calibration system is characterized in that: by introducing t reference time of GPS receiver (3) output ₃Solved difficult alignment issues of time in first measurand (1) and second measurand (2).

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