CN100399660C - Protective relay apparatus comprising photoelectriccurrent sensor - Google Patents

Abstract

The present invention provides a protective relay apparatus. A first photoelectriccurrent sensor (1) and a second photoelectriccurrent sensor (2) are installed at both ends of a protected section (9) of a power system. Optical fiber transmission lines (3a to 3d) series-connect a light source (11), a first photoelectriccurrent sensor (1), a second photoelectriccurrent sensor (2), a first optical signal processing section (4a), and a second optical signal processing section (4b). An action quantity operating means (6a), a suppression quantity operating means (6b), and an action rate operating means (7) determine an action quantity, a suppression quantity, and an action rate from a differential current signal from the first optical signal processing section (4a) and a sum current signal of the second optical signal processing section (4b). Even if a judging means (8) detects that the action quantity over a set value, the fault is judged to be an external fault if the action rate is below a constant, thereby preventing an unnecessary action of the relay.

Description

Use the protection relay system of photocurrent sensor

Technical field

The present invention relates to utilize the electric current that flows through in the conductor of Faraday effect to power equipment to carry out the protection relay system of instrumentation and supervision.

Background technology

In the past, the protection relay system in the electric power system, the current signal of the machine conductor that will detect by current transformer passes to the protection relay system, carries out the computing and the judgement of fault verification in the protection relay system.Cost degradation, light weight with this protection relay system turn to purpose, and (Japan) spy opens 2000-59987 and the flat 11-224821 application of special hope proposes to replace existing amperometric determination method of growing up to be a useful person according to the coiled pipe type electrorheological with the protection relay system according to the photocurrent sensor with differential operational function.

Existing protection relay system according to photocurrent sensor is for example shown in Figure 6, comprising: first photocurrent sensor 1 that is made of polariscope 14, faraday components 11 and analyzer 15; With second photocurrent sensor 2 of first photocurrent sensor 1 with spline structure; Optical fiber transfer path 3a, 3b, 3c; Light source 12; The light signal handling part 4a that constitutes by photoelectric transformer 16, circuit of high pass filter 17, low-pass filter circuit 18 and proportion calculator 19; The spill current detection part 5d of supply frequency component and judging part 8.

First photocurrent sensor 1 and second photocurrent sensor 2 are arranged on the two ends of the guard interval 9 of electric power system.Here suppose that the electric current that first photocurrent sensor 1 detects is i ₁, the electric current that second photocurrent sensor 2 detects is i ₂, to establish its symbol simultaneously and be, the inflow direction of the guard interval 9 of electric power system is+, flow out direction and be-.And the direction of propagation of the light in first photocurrent sensor 1 is set to: with the current i that is detected by first photocurrent sensor 1 ₁The magnetic direction unanimity that produces, the direction of propagation of the light in second photocurrent sensor 2 is set to: with the current i that is detected by second photocurrent sensor 2 ₂The magnetic direction unanimity that produces.

The light P that penetrates by the light source 12 of the light that penetrates provision wavelengths ₀,, arrive first photocurrent sensor 1 by optical fiber transfer path 3a.Light P from light source 12 ₀Polariscope 14 by first photocurrent sensor 1 becomes the straight line polarization, and this straight line polarization incides faraday components 11.Incident light passes through by current i ₁The magnetic field that produces and be subjected to Faraday effect is with current i ₁Be in proportion a plane of polarization anglec of rotation θ ₁The current i that first photocurrent sensor 1 detects ₁Anglec of rotation θ with plane of polarization ₁The pass tie up to when establishing Bel's enlightening constant and being V, for

θ ₁＝V·i ₁…(1)

Described incident light is further by the analyzer 15 in first photocurrent sensor 1, the anglec of rotation θ of plane of polarization ₁Become the light of intensity modulated.At this moment, analyzer 15 relative polariscopes 14 preferably are set to the angle of positive 45 ° or negative 45 °, and the ejaculation light of first photocurrent sensor 1 is divided into the light P of 2 components of x, y direction by analyzer 15 _1x, P _1y, represent with following formula.

P _1x＝(1/2)P ₀(1+sin2θ ₁)

＝(1/2)P ₀(1+sin2V·i ₁)…(2a)

P _1y＝(1/2)P ₀(1-sin2θ ₁)

＝(1/2)P ₀(1-sin2V·i ₁)…(2b)

In the existing apparatus, only use a wherein side light signal, make here and use light P _1xDescribe.

Suppose the current i that first photocurrent sensor 1 detects ₁Be the sine wave AC signal, then the ejaculation light P of first photocurrent sensor 1 _1xRepresent with following formula.

$i_1=\sqrt{2}\·I_1\sin \mathrm{\ωt}...\left(3\right)$

$P_{1x}=(1/2)P_0\{1+\sin (2\sqrt{2}V\·I_1\sin \mathrm{\ωt})\}...\left(4\right)$

Here, I ₁Be the effective value of inflow current, ω (=2 π f) is an angular frequency, and f is a supply frequency.

The ejaculation light P of first photocurrent sensor 1 _1x, arrive second photocurrent sensor 2 by optical fiber transmission path 3b guiding.Penetrate light P _1x, according to the current i that detects by second photocurrent sensor 2 ₂

The Faraday effect in the magnetic field that produces is with current i ₂Be in proportion, plane of polarization only rotates θ ₂Angle.The ejaculation light of second photocurrent sensor 2 is divided into the light P of 2 components of x, y direction equally by analyzer 15 _2x, P _2y, represent with following formula.

P _2x＝(1/2)P _1x(1+sin2θ ₂)

＝(1/4)P ₀(1+sin2θ ₁)(1+sin2θ ₂)

＝(1/4)P ₀(1+sin2V·i ₁)(1+sin2V·i ₂)…(5a)

P _2y＝(1/2)P _1x(1-sin2θ ₂)

＝(1/4)P ₀(1+sin2θ ₁)(1-sin2θ ₂)

＝(1/4)P ₀(1+sin2V·i ₁)(1-sin2V·i ₂)…(5b)

Here, owing in 2 outputs of first photocurrent sensor 1, selected P _1xSo employing is the P of same polarization direction with the ejaculation light of first photocurrent sensor 1 _2xEjaculation light as second photocurrent sensor 2.If in 2 outputs of first photocurrent sensor 1, select P _1y, then adopt P _2yEjaculation light as second photocurrent sensor 2.

The ejaculation light P of second photocurrent sensor 2 _2xBe imported into optical fiber transmission path 3c and incide photoelectric transformer 16, after being transformed to the signal of telecommunication, be separated into DC component and alternating current component by circuit of high pass filter 17, low-pass filter circuit 18, by in proportion calculator 19 with alternating current component divided by DC component, obtain the spill current output S of photocurrent sensor _2xHere, adopting passing ratio calculator 19 is light loss when transmitting for compensated optical signal divided by the method for DC component.The spill current output S of photocurrent sensor _2xRepresent with following formula.

S _2x=(P _2xAlternating current component)/(P _2xDC component) ... (6)

The spill current output S of the photocurrent sensor that obtains here below is described _2xIn have the current i that detects as first photocurrent sensor 1 ₁Current i with 2 detections of second photocurrent sensor ₂The i of spill current ₁+ i ₂Information.Have, the spill current of guard interval 9 that flows to electric power system is with i again ₁+ i ₂Expression is because i ₁, i ₂Symbol all be defined as electric power system guard interval 9 inflow direction for+, flow out direction for-.

The current i that first photocurrent sensor 1 detects ₁Current i with 2 detections of second photocurrent sensor ₂Under the situation for little electric current, have

Set up, (5a) become

$P_{2x}=(1/4)P_0(1+2V\·i_1+2V\·i_2)$

$=(1/4)P_0\{1+2\sqrt{2}V({\mathrm{<figure-callout\; id="1"\; label="I"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">I</figure-callout>}}_1+I_2)\sin \mathrm{\&omega;t}\}...\left(8\right)$

With (8) formula substitution (6) formula, have

$S_{2x}=2\sqrt{2}V({\mathrm{<figure-callout\; id="1"\; label="I"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">I</figure-callout>}}_1+I_2)\sin \mathrm{\&omega;t}...\left(9\right)$

The spill current S of photocurrent sensor _2xBecome and the spill current i that flows to the guard interval 9 of electric power system ₁+ i ₂Proportional value.

But (9) formula is set up in the little galvanic areas that (7) formula is set up, and is false in big galvanic areas.

Therefore the inventor has applied for (Japan) special flat 11-224821 of hope, has proposed to use the spill current i that also can measure the guard interval 9 that flows to electric power system in big galvanic areas ₁+ i ₂The protection relay system of Fibre Optical Sensor.

That is, under the situation that flows through the invalid big electric current of (7) formula, (5a) the ejaculation light P of second photocurrent sensor 2 shown in the formula _2xBe expressed as

$P_{2x}=(1/4)P_0\{1+\sin (2\sqrt{2}V\&CenterDot;I_1\sin \mathrm{\&omega;t})\}\&times;$

$\{1+\sin (2\sqrt{2}V\&CenterDot;I_2\sin \mathrm{\&omega;t})\}...\left(10\right)$

Here, if will by fourier progression expanding method $\sin (2\sqrt{2}V\&CenterDot;I_n\sin \mathrm{\&omega;t})$ Be decomposed into each frequency component and then can be expressed as following (11) formula.

$\underset{m=0}{\overset{\&infin;}{\mathrm{\&Sigma;}}}[2\&CenterDot;J_{2m+1}\left(2V_r{I}_1\right)\&CenterDot;\sin \{(2m+1)\mathrm{\&omega;t}\left\}\right]...\left(11\right)$

Here, J _k(a) be k time Bessel function.

(11) 3 of formula later items are because small the ignorance, for later formula is simply represented, (12b) define A shown in the formula like that with (12a) ₁, A ₂

${\mathrm{<figure-callout\; id="1"\; label="A"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">A</figure-callout>}}_1=2J_1(2\sqrt{2}V\&CenterDot;I_1)...\left(12a\right)$

${\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">A</figure-callout>}}_2=2J_1(2\sqrt{2}V\&CenterDot;I_2)...\left(12b\right)$

Here, A ₁, A ₂Be the effective value I that Bel's enlightening constant be multiply by electric current ₁, I ₂, and the Bessel function of substitution 1 time is resulting, if current i _nBe the sine wave AC signal shown in (3) formula, the time that then is relevant to is constant.

At this moment, (10) formula is expressed as

P _2x＝(1/4)P ₀{1+2A ₁sinωt}{1+2A ₂sinωt}…(12c)

(12c) launched, use trigonometric function formula sin ²Ф=(1/2) (1-cos2 Ф) has

P _2x＝(1/4)P ₀{1+2(A ₁+A ₂)sinωt+4A ₁A ₂sin ²ωt}

＝(1/4)P ₀{1+2A ₁A ₂+2(A ₁+A ₂)sinωt+2A ₁A ₂cos2ωt?}

…(12d)

The spill current output S of the photocurrent sensor of this moment _2x, by (12d) formula substitution (6) formula can be expressed as the formula as (13a).Here, for the later formula of simple expression, the A that (12a), (12b) formula are represented ₁, A ₂Be replaced into the B of (13b), (13c) expression ₁, B ₂

S _2x＝B ₁sinωt+B ₂cos2ωt …(13a)

B ₁＝2(A ₁+A ₂)/(1+2A ₁A ₂) …(13b)

B ₂＝2A ₁A ₂/(1+2A ₁A ₂) …(13c)

Here, B ₁, B ₂The time of being relevant to is constant.

(13a) spill current of the photocurrent sensor shown in formula output S _2x, except the spill current i of the guard interval that flows to electric power system 9 shown in first ₁+ i ₂Frequency component, be outside the supply frequency component, also comprise the item of 2 frequency multiplication components of the supply frequency shown in second.

Here, the item B1 of the supply frequency component by calculating (13b) formula tries to estimate.The inflow current that flows to guard interval 9 in the electric power system of 154kV at 66kV is the situation below the 33kA.In this case, get Bel's enlightening constant V=3.93 * 10 of the L glass fiber type photocurrent sensor of wavelength 1550nm ^-6(rad/A).If use these values, then 1＞＞2A ₁A ₂, Approximate establishment.At this moment, (13b) formula can be expressed as (13d) like that.

Result calculated; the electrical current effective value be 24kA when following the approximate error that produces be below 1%; the electrical current effective value be 33kA when following the approximate error that produces be below 2%, can think that the protection relay system of the L glass fiber type photocurrent sensor that adopts 1550nm is applicable to the fault verification computing.

Therefore, (13a) formula is, when electrical current 33kA is following, with the spill current output S of photocurrent sensor _2xThe identical frequency component of supply frequency in, with the spill current i of the guard interval 9 that flows to electric power system ₁+ i ₂Proportional output, but this means that 2 frequency multiplication components of supply frequency produce as error component.

The following formation of protection relay system: from the spill current output S of photocurrent sensor _2x, the spill current detection part 5d by the supply frequency component removes 2 frequency multiplication components, and judging part 8 is delivered in its output, and relative current is to the spill current i of the guard interval 9 of electric power system ₁+ i ₂Move.

More than in the explanation to prior art, current signal is assumed to the sine wave AC signal.But, during the fault that is short-circuited in the electric power system, must consider that current signal is the overlapping signal that DC component is arranged and carry out transitional decay.At this moment, during overlapping maximum DC component, the fault current of promptly overlapping 100% DC component is represented with following formula.

$i_n\left(t\right)=\sqrt{2}{I}_n\{e^{(-i/\mathrm{\&tau;})}-\cos \mathrm{\&omega;t}\}...\left(14\right)$

τ is the damping time constant by the ratio decision of the reactive component of electric power system and resistive component.Even in the current signal substitution (5a) that the transitionality that (14) formula is represented decays, (6) formula, can not as (13a), represent the supply frequency component respectively.Here, for the guard interval 9 of electric power system, each failure condition of guard interval internal fault, the outer fault of guard interval, the spill current that is subjected to photocurrent sensor is exported S _2xIn the influence of the error component that comprises.

Fig. 2 is the system diagram that is used to illustrate the action of the protection relay system that adopts photocurrent sensor.As the abort situation of the guard interval 9 of electric power system, establishing f1, f3 is the outer fault of guard interval, and f2 is the guard interval internal fault.Interval outer fault with the guard interval 9 of calling electric power system in the following text is an external fault, and the interval internal fault of the guard interval 9 of electric power system is an internal fault.

And; in Fig. 2; first photocurrent sensor 1 and second photocurrent sensor 2 are separately positioned on the two ends of the guard interval 9 of electric power system, by optical fiber transmission path 3a to 3d, are connected with light source 12, the first light signal handling part 4a, the second light signal handling part 4b.Here, first photocurrent sensor 1 detects current i ₁, second photocurrent sensor 2 detects current i ₂

At first consider the situation that external fault takes place, when external fault takes place, current i ₁, i ₂Satisfy

i ₁(t)＝-i ₂(t)…(15)

With (14), (15) formula substitution (5a) formula, then

P _2x＝(1/4)P ₀{1+sin2V·i ₁(t)}{1-sin2V·i ₁(t)}。Here, simple for illustrating, establish

In substitution (14) formula, then (5a) formula becomes

That is,, then flow to the spill current i of the guard interval 9 of electric power system during external fault if fault current is a sine-wave current in the prior art ₁+ i ₂The supply frequency component should be 0, but carry out in overlapping DC component under the situation of signal of transitional decay, DC component produced error signal before decay shown in (16) formula.

Fig. 7 is used for explanation; take place under the overlapping situation that DC component arranged of external fault, fault current; the figure that the possibility of the unnecessary action that produces the protection relay system is arranged in the prior art; in the constant substitution (14) of fault current value shown below and optical fiber, (5a), (6) formula, obtain the value of the signal of each several part by calculating.

The overlapping fault current signal that DC component is arranged that (14) formula is represented in the situation of Fig. 7 (a) expression external fault, Fig. 7 (b) is the light signal P of second photocurrent sensor 2 of this moment _2x/ P ₀, Fig. 7 (c) is the spill current output S of photocurrent sensor _2x, Fig. 7 (d) is the spill current output S of photocurrent sensor _2xThe effective value R of supply frequency component _2xHere, establish photocurrent sensor 1,2 and be the L glass fiber type photocurrent sensor of wavelength 1550nm, its Bel's enlightening constant V is taken as 3.93 * 10 ^-6(rad/A).Fault current i ₁Size be 33kA for effective value, supply frequency is 50Hz, timeconstant is 50ms.And, as the effective value R of the supply frequency of the spill current output of asking photocurrent sensor _2xMethod, in the digital relay circuit, adopt digital filter and effective value computing circuit.Because it is a known technology, only introduces its algorithm here.

Sampling: electrical degree 30 degree

Digital filter: D.F. _1f=(1-Z ^-6) (1+Z ^-1+ Z ^-2+ Z ^-3)

Effective value computing: effective value ²=C _N-3 ²-C _nC _N-6

Below, for the situation with the sine wave AC signal compares, the fault current of the situation of the sine wave AC signal of representing for (3) formula at fault current is with Fig. 7 (e) expression, the light signal P of second photocurrent sensor 2 of Fig. 7 (f) expression this moment _2x/ P ₀, the spill current output S of Fig. 7 (g) expression photocurrent sensor _2x, the spill current output S of Fig. 7 (h) expression photocurrent sensor _2xThe effective value of supply frequency component.

Shown in Fig. 7 (h),, then produce short time error signal (about peak value 4kA, 0.01 second time) after the fault, but do not reach the degree that makes the unnecessary action of relay at once if fault current is the sine wave AC signal during external fault.On the other hand, under the situation of the overlapping transitional current signal that DC component arranged, then shown in Fig. 7 (d), generation can not be ignored the error signal (about peak value 20kA, the time is more than 0.2 second) of the time of degree in fault current.Before the decay of the DC component shown in (16) formula, the supply frequency representation in components is an error signal.

For internal fault, the action of the protection relay system of available technology adopting photocurrent sensor is described with Fig. 7.Fig. 7 (i) is illustrated in internal fault takes place in the system shown in Figure 2, and fault current has 100% signal without direct current component for overlapping shown in (14) formula, the light signal P of second photocurrent sensor 2 of Fig. 7 (j) expression this moment _2x/ P ₀, the spill current output S of Fig. 7 (k) expression photocurrent sensor _2x, the spill current output S of Fig. 7 (1) expression photocurrent sensor _2xThe effective value of supply frequency component.

In Fig. 7 (m) expression system shown in Figure 2 internal fault takes place, fault current is the situation of the sine wave AC signal shown in (3) formula, the light signal P of Fig. 7 (n) expression second photocurrent sensor 2 at this moment _2x/ P ₀, the spill current output S of Fig. 7 (o) expression photocurrent sensor _2x, the spill current output S of Fig. 7 (p) expression photocurrent sensor _2xThe effective value of supply frequency component.

Interval internal fault for shown in Fig. 7 (1), Fig. 7 (p) can obtain good action by prior art.

As described above, in the prior art, when the fault current of DC component was arranged, the situation of internal fault can normally detect overlapping, and the situation of external fault then produces the error signal that has seemed to take place internal fault.

Summary of the invention

The object of the present invention is to provide a kind of protection relay system that uses photocurrent sensor; even under the situation that detects the overlapping fault current that DC component arranged; detection when taking place based on internal fault; when external fault takes place, do not judge by accident to internal fault ground yet and differentiate, relay is unnecessarily moved.

The invention provides a kind of protection relay system that uses photocurrent sensor, measure first photocurrent sensor of input current in the end configuration of the guard interval of electric power system, and measure second photocurrent sensor of output current in other end configuration, described first and second photocurrent sensors have: the incident end; Examine the analyzer of light with two polarization directions of positive 45 degree and negative 45 degree with respect to the polariscopic polarization direction that is arranged on described incident end; And the ejecting end of corresponding each self check light component; Between light source and described first photocurrent sensor, connect with optical fiber transmission path between described first and second photocurrent sensors and between described second photocurrent sensor and the light signal handling part; The protection relay system comprises: the spill current detection part that detects the spill current component from the output signal of described light signal handling part; From the output signal of described light signal handling part detect and current component and current detecting part; Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described spill current detection part; Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described spill current detection part and described and output current detecting part; Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit; Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

In addition, the invention provides a kind of protection relay system that uses photocurrent sensor, measure first photocurrent sensor of input current in the end configuration of the guard interval of electric power system, and measure second photocurrent sensor of output current in other end configuration, described first and second photocurrent sensors have: the incident end; Examine the analyzer of light with two polarization directions of positive 45 degree and negative 45 degree with respect to the polariscopic polarization direction that is arranged on described incident end; And the ejecting end of corresponding each self check light component; Between light source and described first photocurrent sensor, connect with optical fiber transmission path between described first and second photocurrent sensors and between described second photocurrent sensor and the light signal handling part; The protection relay system comprises: the spill current detection part that detects the spill current component from the output signal of described light signal handling part; From the output signal of described light signal handling part detect and current component and current detecting part; Obtain the compensation operation parts of input and output electric current separately from the output of described spill current detection part and described and output current detecting part; Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described compensation operation parts; Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described compensation operation parts; Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit; Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

In addition, the invention provides a kind of protection relay system, be used to monitor the fault of the electric power system with guard interval, described protection relay system comprises:

Penetrate the light source of regulation light signal;

Be configured in distolateral first photocurrent sensor of the guard interval of described electric power system, this first photocurrent sensor, acceptance is from the described light signal of described light source, with the plane of polarization of the described light signal of rotation of distolateral first electric current that flows through of the guard interval of described electric power system with being in proportion, first light signal of at least one durection component in the described light signal that the emission plane of polarization has rotated;

Be configured in another second distolateral photocurrent sensor of the guard interval of described electric power system, this second photocurrent sensor, acceptance is from described first light signal of described first photocurrent sensor, second light signal of at least one durection component in described first light signal that the plane of polarization that is further rotated described first light signal of second electric current of crossing with the other end effluent of the guard interval of described electric power system, emission plane of polarization have been further rotated with being in proportion and the 3rd light signal of other direction component;

Obtain the first light signal handling part from described second light signal as the spill current output of the difference of described first electric current and described second electric current;

From described the 3rd light signal obtain as described first electric current and described second electric current and with the second light signal handling part of electric current output;

Detect the spill current detection part of the described spill current output of the described first light signal handling part;

Detect the described second light signal handling part described and electric current output and current detecting part;

Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described spill current detection part;

Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described spill current detection part and described and output current detecting part;

Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit;

Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the described guard interval of described electric power system or guard interval.

In addition, the invention provides a kind of protection relay system, be used to monitor the fault of the electric power system with guard interval, described protection relay system comprises:

Penetrate the light source of regulation light signal;

Be configured in distolateral first photocurrent sensor of the guard interval of described electric power system, this first photocurrent sensor, acceptance is from the described light signal of described light source, with the plane of polarization of the described light signal of rotation of distolateral first electric current that flows through of the guard interval of described electric power system with being in proportion, first light signal of at least one durection component in the described light signal that the emission plane of polarization has rotated;

Be configured in another second distolateral photocurrent sensor of the guard interval of described electric power system, this second photocurrent sensor, acceptance is from described first light signal of described first photocurrent sensor, second light signal of at least one durection component in described first light signal that the plane of polarization that is further rotated described first light signal of second electric current of crossing with the other end effluent of the guard interval of described electric power system, emission plane of polarization have been further rotated with being in proportion and the 3rd light signal of other direction component;

Obtain the first light signal handling part from described second light signal as the spill current output of the difference of described first electric current and described second electric current;

From described the 3rd light signal obtain as described first electric current and described second electric current and with the second light signal handling part of electric current output;

Detect the spill current detection part of the described spill current output of the described first light signal handling part;

Detect the described second light signal handling part described and electric current output and current detecting part;

Obtain the compensation operation parts of input and output electric current separately from the output of described spill current detection part and described and output current detecting part;

Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described compensation operation parts;

Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described compensation operation parts;

Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit;

Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

In addition, the invention provides a kind of method that is used to detect the fault of electric power system, comprising with guard interval:

Step at distolateral configuration first photocurrent sensor of the guard interval of described electric power system;

The step of the size of one distolateral first electric current that flows through of the guard interval by the described electric power system of the described first photocurrent sensor perception;

Step at another distolateral configuration second photocurrent sensor of the guard interval of described electric power system;

The step of the size of second electric current that the other end effluent of the guard interval by the described electric power system of the described second photocurrent sensor perception is crossed;

Obtain step as the spill current output of the difference of described first electric current and described second electric current;

Obtain as described first electric current and described second electric current and with the step of electric current output;

Obtain the step of actuating quantity from described spill current output;

Export the step of obtaining amount of suppression from output of described spill current and described and electric current;

Obtain the step of action ratio from described actuating quantity and described amount of suppression;

To differentiate be the step of the outer fault of fault in the guard interval of described electric power system or guard interval in output according to described actuating quantity and described action ratio.

The present invention also provides a kind of method that is used to detect the fault of the electric power system with guard interval, comprising:

Step at distolateral configuration first photocurrent sensor of the guard interval of described electric power system;

The step of the size of one distolateral first electric current that flows through of the guard interval by the described electric power system of the described first photocurrent sensor perception;

Step at another distolateral configuration second photocurrent sensor of the guard interval of described electric power system;

The step of the size of second electric current that the other end effluent of the guard interval by the described electric power system of the described second photocurrent sensor perception is crossed;

Obtain step as the spill current output of the difference of described first electric current and described second electric current;

Obtain as described first electric current and described second electric current and with the step of electric current output;

Export the step of obtaining input and output electric current separately from output of described spill current and described and electric current;

Obtain the step of actuating quantity from described input and output electric current;

Obtain the step of amount of suppression from described input and output electric current;

Obtain the step of action ratio from described actuating quantity and described amount of suppression;

Differentiating according to described actuating quantity and described action ratio is the step of the outer fault of fault in the guard interval of described electric power system or guard interval.

Description of drawings

Fig. 1 represents embodiments of the present invention, is the structure chart that the protection relay system of photocurrent sensor is used in explanation.

Fig. 2 represents embodiments of the present invention, is the system diagram that the protection relay system of photocurrent sensor is used in explanation.

Fig. 3 is an example of the output waveform when measuring fault current according to embodiments of the present invention.

Fig. 4 represents other execution modes of the present invention, is the structure chart that the protection relay system of photocurrent sensor is used in explanation.

Fig. 5 is an example of the output waveform when measuring fault current according to other execution modes of the present invention.

Fig. 6 is to use the key diagram of protection relay system of the photocurrent sensor of prior art.

Fig. 7 is an example of the output waveform when measuring fault current according to prior art.

Embodiment

Below, with reference to the description of drawings embodiments of the present invention.

Shown in (5a) of prior art, (5b), the output signal of photocurrent sensor is the light P of 2 components of x, y direction _2x, P _2y, can only use a side wherein in the prior art.Below explanation, if do not use a side light signal, even the external fault of the DC component that then overlaps can not judged by accident yet and is internal fault, that is, decidable is external fault or internal fault.

Fig. 1 is the key diagram of the execution mode of the expression protection relay system that uses photocurrent sensor of the present invention.In order to obtain the difference current signal S of photocurrent sensor _2x, with use light signal P _2xEqually, use light signal P _2y

Below explanation is by light signal P _2xThe difference current signal S of the photocurrent sensor that obtains _2xHas the current i that detects as first photocurrent sensor 1 ₁Current i with 2 detections of second photocurrent sensor ₂The i of spill current ₁+ i ₂Information, also can be from light signal P _2yAcquisition has as i ₁And i ₂With the i of electric current ₁-i ₂Information with electric current output S _2yAnd, flow to electric power system guard interval 9 with electric current with i ₁-i ₂Expression, i ₁, i ₂Symbol all be defined as electric power system guard interval 9 inflow direction for+, flow out direction and be-.

Have, in the following description, in the figure and formula of the item of reference prior art, identical or suitable part is given identical mark and is omitted explanation again.

Fig. 1 comprises: first photocurrent sensor 1 that is made of polariscope 14, faraday components 11 and analyzer 15; With first photocurrent sensor, 1 same second photocurrent sensor 2 that constitutes; Light source 12; The first light signal handling part 4a that constitutes by photoelectric transformer 16, circuit of high pass filter 17, low-pass filter circuit 18 and proportion calculator 19; With the same second light signal handling part 4b that constitutes of the first light signal handling part 4a; Transmit the optical fiber transmission path 3a of light source 12 and 1 light signal of first photocurrent sensor; Transmit the optical fiber transmission path 3b of first photocurrent sensor 1 and 2 light signals of second photocurrent sensor; Transmit and penetrate light signal P in 2 ejecting ends of second photocurrent sensor 2 with spill current information _2xEjecting end and the first light signal handling part 4a between the optical fiber transmission path 3c of light signal; Transmit and penetrate the light signal P that has with current information in 2 ejecting ends of second photocurrent sensor 2 _2yEjecting end and the second light signal handling part 4b between the optical fiber transmission path 3d of light signal; Detect the spill current output S of the first light signal handling part 4a _2xSpill current detection part 5a; That detects the second light signal handling part 4b exports S with electric current _2yWith current detecting part 5b; Obtain the actuating quantity arithmetic unit 6a of actuating quantity from the output of spill current detection part 5a; From spill current detection part 5a and and the output of current detecting part 5b obtain the amount of suppression arithmetic unit 6b of amount of suppression; Obtain the action ratio arithmetic unit 7 of action ratio from the output of actuating quantity arithmetic unit 6a and amount of suppression arithmetic unit 6b; Differentiating according to the output of the output of actuating quantity detection part 6a and action ratio arithmetic unit 7 is the fault in the guard interval of electric power system or the judging part 8 of interval outer fault.

First photocurrent sensor 1 and second photocurrent sensor 2 situation that is provided with and the structure of light signal handling part 4a in the guard interval 9 of electric power system is same as the prior art, obtains the spill current output S of photocurrent sensor from light signal handling part 4a _2x

On the other hand, the light signal that is imported by optical fiber transmission path 3d is the described P of (5b) formula _2ySignal.Another light signal P from second photocurrent sensor 2 _2yBe inducted into the photoelectric transformer 16 that is mapped to the second light signal handling part 4b by optical fiber transmission path 3d, by same signal processing, what obtain photocurrent sensor exports S with electric current _2yPhotocurrent sensor with electric current output S2 _yRepresent with following formula.

S _2y=(P _2yAlternating current component)/(P _2yDC component) ... (17)

Here, to (5a), (5b) formula, adopt the approximate of (7) formula, then the S of (6) formula _2x(17) S of formula _2yCan simply be expressed as follows.

S _2x＝α ₀(i ₁+i ₂)+δ _x…(18a)

S _2y＝α ₀(i ₁-i ₂)+δ _y…(18b)

Here, α ₀=2V, V are Bel's enlightening constant of photocurrent sensor.

Here, (18a) first of formula for being contained in S _2xThe spill current component of signal, second for being contained in S _2xThe error signal component δ of signal _x

Similarly, (18b) first of formula for being contained in S _2ySignal and current component, second for being contained in S _2yThe error signal component δ of signal _y

δ _x, δ _yDepend on the overlapping transitional deamplification that DC component is arranged, shown in (16) formula, before the DC component decay, produce.

Usually, use the action ratio k of the percentage differential relay of protection relay to be the ratio of actuating quantity m and amount of suppression n, represent with following formula.

Action ratio k=m/n ... (19)

Actuating quantity m=|i ₁+ i ₂| ... (20a)

Amount of suppression n=|i ₁|+| i ₂| ... (20b)

Here, | i ₁+ i ₂| expression spill current i ₁+ i ₂Effective value, | i ₁| and | i ₂| represent i respectively ₁Effective value and i ₂Effective value.

(18a), comprise error signal δ in (18b) formula _x, δ _y, suppose that it is the size that can temporarily ignore, the S that then utilizes spill current detection part 5a to obtain _2XWith the S that obtains with current detecting part 5b _2yAsk the method for the action ratio k that (19) formula represents as follows.

In the actuating quantity arithmetic unit 6a of Fig. 1, can try to achieve the actuating quantity m of (20a) formula by (21a) formula.

$S_{2x}={\mathrm{\&alpha;}}_0({\mathrm{<figure-callout\; id="1"\; label="i"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">i</figure-callout>}}_1+i_2)+{\mathrm{\&delta;}}_x$

In amount of suppression arithmetic unit 6b, can try to achieve the amount of suppression n of (20b) formula by (21b) formula.

$S_{2x}+S_{2y}={\mathrm{\&alpha;}}_0({\mathrm{<figure-callout\; id="1"\; label="i"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">i</figure-callout>}}_1+i_2)+{\mathrm{\&delta;}}_x+{\mathrm{\&alpha;}}_0(i_1-i_2)+{\mathrm{\&delta;}}_y$

$=2{\mathrm{\&alpha;}}_0{\mathrm{<figure-callout\; id="1"\; label="i"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">i</figure-callout>}}_1+{\mathrm{\&delta;}}^{\&prime;}$

$S_{2x}-S_{2y}={\mathrm{\&alpha;}}_0({\mathrm{<figure-callout\; id="1"\; label="i"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">i</figure-callout>}}_1+i_2)+{\mathrm{\&delta;}}_x-{\mathrm{\&alpha;}}_0(i_1-i_2)-{\mathrm{\&delta;}}_y$

$=2{\mathrm{\&alpha;}}_0{\mathrm{<figure-callout\; id="2"\; label="i"\; filenames="C0380283700261.png,C0380283700301.png"\; state="\{\{state\}\}">i</figure-callout>}}_2+{\mathrm{\&delta;}}^{\&prime;\&prime;}$

$n=\left|i_1\right|+\left|i_2\right|$

Will (21a) formula in action ratio arithmetic unit 7 and (21b) formula substitution (19) formula in can try to achieve and move ratio k.

k＝m/n＝|i ₁+i ₂|/(|i ₁|+|i ₂|)

＝{|S _2x|/α ₀}/{|(S _2x+S _2y)+(S _2x-S _2y)|/(2α ₀)}

＝2·|S _2x|/(|S _2x+S _2y|+|S _2x-S _2y|)…(22)

The actuating quantity of obtaining among the actuating quantity arithmetic unit 6a is that the action ratio that m and action ratio arithmetic unit 7 are obtained is k, in judging part 8, if the actuating quantity adjusted value is k1, if action ratio adjusted value is k2, when m＞k1 and k＞k2, be judged to be internal fault, thus, even also can prevent unnecessary action in the external fault for the overlapping fault current that DC component arranged.

By actuating quantity m, the action ratio k that above-mentioned (21a) formula, (22) formula are obtained, be the error component δ shown in supposition (18a), (18b) formula _xAnd δ _yFor the size that temporarily can ignore is obtained, but the size of error component, change with the sensitivity of the size of fault current and the current sensor that uses.But, when external fault takes place and the action ratio k of internal fault when taking place if any than big-difference, then in judging part 8, can differentiate fault and be in the inside of guard interval or externally.

Below, in the electric power system of reality,, be or externally in the inside of guard interval by calculate confirming to differentiate fault according to described method.

The maximum fault current of the electric power system of supposing is 33kA, and overlapping DC component is 100%, timeconstant=100ms.Fibre Optical Sensor that uses and prior art be same, be the L glass fiber type photocurrent sensor of wavelength 1550nm, and its Bel's enlightening constant V gets 3.93 * 10 ^-6(rad/A).

For the guard interval 9 of electric power system,,, similarly adopt the system diagram of Fig. 2 with explanation in the prior art for the action of protection relay system that use photocurrent sensor of the present invention is described to each failure condition of external fault, internal fault.

The abort situation of external fault in system shown in Figure 2 is two kinds of situations of f1 and f3, can think that they are equal, so be the typical example of external fault here with f1.

The situation of internal fault has the two ends of power configuration, a side power supply of f1 side, 3 kinds of situations of a side power supply of f3 side.One side power supply f1 side and f3 side can be thought same, are typical example with the f1 side.

Under the situation about breaking down in the power configuration of both sides, can think i ₁, i ₂

i ₁(t)＝i ₂(t)

Under the situation about breaking down in the one side power configuration, establish

i ₂(t)＝0

Fig. 3 is used for illustrating that the action ratio k that is obtained by (22) formula has the figure of bigger difference at internal fault and external fault, be in the constant substitution (14), (5a), (5b), (6), (17), (21a), (21b), (22) formula of value, the optical fiber of the fault current shown in will be previous, try to achieve by calculating.

In addition, as the effective value of in actuating quantity arithmetic unit 6a and amount of suppression arithmetic unit 6b, obtaining the supply frequency component | S _2x|, | S _2x+ S _2y| and | S _2x-S _2y| method, same with prior art, with following algorithm computation.

Sampling: electrical degree 30 degree

Digital filter: D.F. _1f=(1-Z ^-6) (1+Z ^-1+ Z ^-2+ Z ^-3)

Effective value computing: effective value ²=C _N-3 ²-C _nC _N-6

The overlapping fault current i that DC component is arranged that Fig. 3 (a) expression is represented by (14) formula ₁(t), expression fault current i ₁The waveform of=33kA.Fig. 3 (b) is the situation of external fault to Fig. 3 (d), Fig. 3 (b) expression actuating quantity m, Fig. 3 (c) expression amount of suppression n, Fig. 3 (d) expression action ratio k.Fault current i is shown ₁4 kinds of situations of=33kA, 24kA, 15kA, 9kA.

Equally, Fig. 3 (e) is positioned at the situation of both sides power configuration to Fig. 3 (g) for internal fault, Fig. 3 (e) expression actuating quantity m, Fig. 3 (f) expression amount of suppression n, Fig. 3 (g) expression action ratio k.Following 4 kinds of situations of fault current are shown.

i ₁＝+16.5kA、i ₂＝+16.5kA、

i ₁＝+12.0kA、i ₂＝+12.0kA、

i ₁＝+7.5kA、i ₂＝+7.5kA、

i ₁＝+4.5kA、i ₂＝+4.5kA

Fig. 3 (h) is positioned at the situation of a side power configuration to Fig. 3 (j) for internal fault, Fig. 3 (h) expression actuating quantity m, Fig. 3 (i) expression amount of suppression n, Fig. 3 (j) expression action ratio k.Fault current i is shown ₁4 kinds of situations of=33kA, 24kA, 15kA, 9kA.

Fig. 3 (g), Fig. 3 (j) to the action ratio k of each situation of Fig. 3 (d) of the action ratio K of expression external fault condition, expression internal fault both sides power configuration, internal fault one side power configuration compare and can understand, the action ratio is under the situation of internal fault, a both sides power supply and a side power supply all are 100%, under the situation of external fault, moment has been raised to 20%, but compare with internal fault then be evident as little.

Therefore; during decision action ratio adjusted value k2; externally during fault by being set at the big value of value of the action ratio k that rises than moment; even actuating quantity m is bigger than actuating quantity adjusted value k1 in judging part 8; as long as action ratio k is littler than action ratio adjusted value k2; then be judged to be external fault, can prevent to protect the unnecessary action of relay system.

Fig. 4 is the key diagram of other execution modes of the expression protection relay system that uses photocurrent sensor of the present invention.In the following description, in figure and formula with reference to above-mentioned prior art and above-mentioned execution mode, identical or suitable part is endowed identical mark and omits explanation.

Its structure is: first photocurrent sensor 1; Second photocurrent sensor 2; Light source 12; Optical signal processing circuit 4; Optical fiber transmission path 3a, 3b, 3c, 3d; The first light signal handling part 4a; The second light signal handling part 4b; Spill current detection part 5a; With current detecting part 5b; From the output of spill current detection part 5a and and the output of current detecting part 5b obtain the compensation operation parts 5c of input and output electric current respectively; Obtain the actuating quantity arithmetic unit 6c of actuating quantity from the output of compensation operation parts 5c; Obtain the amount of suppression arithmetic unit 6d of amount of suppression from the output of compensation operation parts 5c; Obtain the action ratio arithmetic unit 7 of action ratio from the output of the output of actuating quantity arithmetic unit 6c and amount of suppression arithmetic unit 6d; Differentiating according to the output of the output of actuating quantity arithmetic unit 6c and action ratio arithmetic unit 7 is the fault in the guard interval of electric power system or the judging part 8 of interval outer fault.

Here,, adopt the approximate of (7) formula, then can be rewritten as follows (5a), (5b) formula.

P _2x＝(1/4)P ₀(1+α ₀i ₁)(1+α ₀i ₂)…(25a)

P _2y＝(1/4)P ₀(1+α ₀i ₁)(1-α ₀i ₂)…(25b)

(α ₀＝2V)

At this moment, the output S of spill current detection part 5a _2x, and the output S of current detecting part 5b _2yCan followingly represent.

S _2x＝α ₀(i ₁+i ₂)+α ₀ ²(i ₁·i ₂)…(26a)

S _2y＝α ₀(i ₁-i ₂)-α ₀ ²(i ₁·i ₂)…(26b)

Here, (26a) first of formula for being contained in S _2xThe spill current component of signal, second for being contained in S _2xThe error signal component α of signal ₀ ²(i ₁I ₂).Similarly, (26b) first of formula for being contained in S _2ySignal and current component, second for being contained in S _2yThe error signal component of signal.

Then, the output S of spill current detection part 5a _2x, and the output S of current detecting part 5b _2yIn compensation operation parts 5c, the following error component α that removes ₀ ²(i ₁I ₂).That is, by shown in (27a) to (27c), definition S _Z1, S _Z2, S _Z3, obtain i by (28a), (28b) ₁, i ₂

S _z1＝(S _2x+S _2y)/2

＝α ₀i ₁ …(27a)

S _z2＝(S _2x-S _2y)/2

＝α ₀i ₂+α ₀ ²(i ₁·i ₂)

＝α ₀i ₂(1+α ₀i ₁)…(27b)

S _z3＝S _z2/(1+S _z1)

＝α ₀i ₂ …(27c)

i ₁＝S _z1/α ₀ …(28a)

i ₂＝S _z3/α ₀

＝S _z2{α ₀(1+S _z1)}…(28b)

The i that obtains with compensation operation parts 5c ₁, i ₂, in actuating quantity arithmetic unit 6c, amount of suppression arithmetic unit 6d, obtain actuating quantity m and amount of suppression n according to following (29a), (29b) formula.

Actuating quantity m=|i ₁+ i ₂|

＝|S _z1+S _z3|/α ₀ …(29a)

Amount of suppression n=|i ₁|+| i ₂|

＝(|S _z1|+|S _z3|)/α ₀ …(29b)

Actuating quantity m that obtains according to above (29a), (29b) formula among actuating quantity arithmetic unit 6c, the amount of suppression arithmetic unit 6d and amount of suppression n obtain action ratio k according to (30) formula in action ratio arithmetic unit 7.

Action ratio k=m/n

＝|S _z1+S _z3|/(|S _z1|+|S _z3|)…(30)

The action ratio k that obtains in actuating quantity m that obtains among the actuating quantity arithmetic unit 6c and the action ratio arithmetic unit 7, in judging part 8, if the actuating quantity adjusted value is k1, when if action ratio adjusted value is k2, when m＞k1 and k＞k2, be judged to be internal fault, thus, even also can prevent unnecessary action in the external fault for the overlapping fault current that DC component arranged.

Fig. 5 is used for action ratio k that explanation obtained by (30) formula at internal fault and external fault the figure of bigger difference to be arranged, for adopting same condition result calculated with the calculating shown in Figure 3 of above-mentioned execution mode.

The overlapping fault current i that DC component is arranged that Fig. 5 (a) expression is represented by (14) formula _n(t), expression fault current effective value i _nThe waveform of=33kA.Fig. 5 (b) is the situation of external fault to Fig. 5 (d), Fig. 5 (b) expression actuating quantity m, Fig. 5 (c) expression amount of suppression n, Fig. 5 (d) expression action ratio k.Fault current i is shown ₁4 kinds of situations of=33kA, 24kA, 15kA, 9kA.

Equally, Fig. 5 (e) is positioned at the situation of both sides power configuration to Fig. 5 (g) for internal fault, Fig. 5 (e) expression actuating quantity m, Fig. 5 (f) expression amount of suppression n, Fig. 5 (g) expression action ratio k.Following 4 kinds of situations of fault current are shown.

i ₁＝+16.5kA、i ₂＝+16.5kA、

i ₁＝+12.0kA、i ₂＝+12.0kA、

i ₁＝+7.5kA、i ₂＝+7.5kA、

i ₁＝+4.5kA、i ₂＝+4.5kA

Fig. 5 (h) is positioned at the situation of a side power configuration to Fig. 5 (j) for internal fault, Fig. 5 (h) expression actuating quantity m, Fig. 5 (i) expression amount of suppression n, Fig. 5 (j) expression action ratio k.Fault current i is shown ₁4 kinds of situations of=33kA, 24kA, 15kA, 9kA.

Fig. 5 (d) of external fault condition, Fig. 5 (g), Fig. 5 (j) of internal fault situation are compared and can understand, action ratio k is under the situation of internal fault, one side power supply and both sides power supply all are 100%, under the situation of external fault, moment has been raised to 5%, still compares with internal fault and then is evident as little value.

As above such; when externally fault takes place by being set at the big action ratio adjusted value k2 of value of the action ratio k that rises than moment; even actuating quantity m is bigger than actuating quantity adjusted value k1 in judging part 8; as long as action ratio k is littler than action ratio adjusted value k2; then be judged to be external fault, can prevent to protect the unnecessary action of relay system.

As described above, according to the protection relay system of photocurrent sensor of the present invention,, also can prevent the unnecessary action of relay even external fault takes place.

Claims (15)

1. protection relay system that uses photocurrent sensor, measure first photocurrent sensor of input current in the end configuration of the guard interval of electric power system, and measure second photocurrent sensor of output current in other end configuration, described first and second photocurrent sensors have: the incident end; Examine the analyzer of light with two polarization directions of positive 45 degree and negative 45 degree with respect to the polariscopic polarization direction that is arranged on described incident end; And the ejecting end of corresponding each self check light component; Between light source and described first photocurrent sensor, connect with optical fiber transmission path between described first and second photocurrent sensors and between described second photocurrent sensor and the light signal handling part; The protection relay system comprises: the spill current detection part that detects the spill current component from the output signal of described light signal handling part; From the output signal of described light signal handling part detect and current component and current detecting part; Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described spill current detection part; Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described spill current detection part and described and output current detecting part; Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit; Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

2. protection relay system that uses photocurrent sensor, measure first photocurrent sensor of input current in the end configuration of the guard interval of electric power system, and measure second photocurrent sensor of output current in other end configuration, described first and second photocurrent sensors have: the incident end; Examine the analyzer of light with two polarization directions of positive 45 degree and negative 45 degree with respect to the polariscopic polarization direction that is arranged on described incident end; And the ejecting end of corresponding each self check light component; Between light source and described first photocurrent sensor, connect with optical fiber transmission path between described first and second photocurrent sensors and between described second photocurrent sensor and the light signal handling part; The protection relay system comprises: the spill current detection part that detects the spill current component from the output signal of described light signal handling part; From the output signal of described light signal handling part detect and current component and current detecting part; Obtain the compensation operation parts of input and output electric current separately from the output of described spill current detection part and described and output current detecting part; Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described compensation operation parts; Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described compensation operation parts; Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit; Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

3. protect relay system for one kind, be used to monitor the fault of the electric power system with guard interval, described protection relay system comprises:

Penetrate the light source of regulation light signal;

Be configured in distolateral first photocurrent sensor of the guard interval of described electric power system, this first photocurrent sensor, acceptance is from the described light signal of described light source, with the plane of polarization of the described light signal of rotation of distolateral first electric current that flows through of the guard interval of described electric power system with being in proportion, first light signal of at least one durection component in the described light signal that the emission plane of polarization has rotated;

Be configured in another second distolateral photocurrent sensor of the guard interval of described electric power system, this second photocurrent sensor, acceptance is from described first light signal of described first photocurrent sensor, second light signal of at least one durection component in described first light signal that the plane of polarization that is further rotated described first light signal of second electric current of crossing with the other end effluent of the guard interval of described electric power system, emission plane of polarization have been further rotated with being in proportion and the 3rd light signal of other direction component;

Obtain the first light signal handling part from described second light signal as the spill current output of the difference of described first electric current and described second electric current;

From described the 3rd light signal obtain as described first electric current and described second electric current and with the second light signal handling part of electric current output;

Detect the spill current detection part of the described spill current output of the described first light signal handling part;

Detect the described second light signal handling part described and electric current output and current detecting part;

Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described spill current detection part;

Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described spill current detection part and described and output current detecting part;

Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit;

Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the described guard interval of described electric power system or guard interval.

4. protection relay system as claimed in claim 3, wherein

Described first photocurrent sensor comprises:

Being used for will be from the regulation light signal of described light source first polariscope as the straight line polarization signal;

Accept the described straight line polarization signal of described first polariscope output, according to the Faraday effect in the magnetic field that produces by described first electric current, with being in proportion of described first electric current rotate first faraday components of the plane of polarization of described straight line polarization signal with predetermined angular;

The described straight line polarization signal of described first faraday components output is divided into first analyzer of the light signal of the light signal of x durection component and y durection component at least, and the light signal of x durection component wherein is described first light signal.

5. protection relay system as claimed in claim 4, wherein

Described second photocurrent sensor comprises:

Be used for to become second polariscope of straight line polarization signal from described first light signal of described first analyzer;

Accept the described straight line polarization signal of described second polariscope output, according to the Faraday effect in the magnetic field that produces by described second electric current, with being in proportion of described second electric current rotate second faraday components of the plane of polarization of described straight line polarization signal with predetermined angular;

Second analyzer that the described straight line polarization signal of described second faraday components output is divided into described the 3rd light signal of described second light signal of x durection component and y durection component.

6. protection relay system as claimed in claim 5, wherein

The polarization direction of described first light signal is identical with the polarization direction of described second light signal.

7. protection relay system as claimed in claim 6, wherein

The described first light signal handling part comprises:

Described second converting optical signals that is used for described second analyzer of described second photocurrent sensor is exported is first photoelectric transformer of the signal of telecommunication;

From the signal of telecommunication of described first photoelectric transformer output, take out first low-pass filter circuit of DC component;

From the signal of telecommunication of described first photoelectric transformer output, take out first circuit of high pass filter of alternating current component;

Divided by described DC component, obtain first proportion calculator of described spill current output with described alternating current component.

8. protection relay system as claimed in claim 7, wherein

The described second light signal handling part comprises:

Described the 3rd converting optical signals that is used for described second analyzer of described second photocurrent sensor is exported is second photoelectric transformer of the signal of telecommunication;

From the signal of telecommunication of described second photoelectric transformer output, take out second low-pass filter circuit of DC component;

From the signal of telecommunication of described second photoelectric transformer output, take out second circuit of high pass filter of alternating current component;

Divided by described DC component, obtain second proportion calculator described and electric current output with described alternating current component.

9. protection relay system as claimed in claim 8, wherein

Described first electric current from the outside of described guard interval to the inflow direction of the inboard of described guard interval for just,

Described first electric current from the inboard of described guard interval to the outflow direction in the outside of described guard interval for negative,

Described second electric current from the outside of described guard interval to the inflow direction of the inboard of described guard interval for just,

Described second electric current from the inboard of described guard interval to the outflow direction in the outside of described guard interval for negative.

10. protection relay system as claimed in claim 9, wherein

Setting makes the direction of propagation of the light in described first photocurrent sensor consistent with the magnetic direction that described first electric current that is detected by this first photocurrent sensor produces,

Setting makes the direction of propagation of the light in described second photocurrent sensor consistent with the magnetic field that described second electric current that is detected by this second photocurrent sensor produces.

11. protection relay system as claimed in claim 10, wherein

Relative first polariscope of described first analyzer is with 45 ° angle setting.

12. protection relay system as claimed in claim 11, wherein

Described relatively second polariscope of described second analyzer is with 45 ° angle setting.

13. protect relay system for one kind, be used to monitor the fault of electric power system with guard interval, described protection relay system comprises:

Penetrate the light source of regulation light signal;

Be configured in distolateral first photocurrent sensor of the guard interval of described electric power system, this first photocurrent sensor, acceptance is from the described light signal of described light source, with the plane of polarization of the described light signal of rotation of distolateral first electric current that flows through of the guard interval of described electric power system with being in proportion, first light signal of at least one durection component in the described light signal that the emission plane of polarization has rotated;

Be configured in another second distolateral photocurrent sensor of the guard interval of described electric power system, this second photocurrent sensor, acceptance is from described first light signal of described first photocurrent sensor, second light signal of at least one durection component in described first light signal that the plane of polarization that is further rotated described first light signal of second electric current of crossing with the other end effluent of the guard interval of described electric power system, emission plane of polarization have been further rotated with being in proportion and the 3rd light signal of other direction component;

Obtain the first light signal handling part from described second light signal as the spill current output of the difference of described first electric current and described second electric current;

From described the 3rd light signal obtain as described first electric current and described second electric current and with the second light signal handling part of electric current output;

Detect the spill current detection part of the described spill current output of the described first light signal handling part;

Detect the described second light signal handling part described and electric current output and current detecting part;

Obtain the compensation operation parts of input and output electric current separately from the output of described spill current detection part and described and output current detecting part;

Obtain the actuating quantity arithmetic unit of actuating quantity from the output of described compensation operation parts;

Obtain the amount of suppression arithmetic unit of amount of suppression from the output of described compensation operation parts;

Obtain the action ratio arithmetic unit of action ratio from the output of the output of described actuating quantity arithmetic unit and described amount of suppression arithmetic unit;

Differentiating according to the output of the output of described actuating quantity arithmetic unit and described action ratio arithmetic unit is the judging part of the outer fault of fault in the guard interval of described electric power system or guard interval.

14. a method that is used to detect the fault of the electric power system with guard interval comprises:

Step at distolateral configuration first photocurrent sensor of the guard interval of described electric power system;

The step of the size of one distolateral first electric current that flows through of the guard interval by the described electric power system of the described first photocurrent sensor perception;

Step at another distolateral configuration second photocurrent sensor of the guard interval of described electric power system;

The step of the size of second electric current that the other end effluent of the guard interval by the described electric power system of the described second photocurrent sensor perception is crossed;

Obtain step as the spill current output of the difference of described first electric current and described second electric current;

Obtain as described first electric current and described second electric current and with the step of electric current output;

Obtain the step of actuating quantity from described spill current output;

Export the step of obtaining amount of suppression from output of described spill current and described and electric current;

Obtain the step of action ratio from described actuating quantity and described amount of suppression;

To differentiate be the step of the outer fault of fault in the guard interval of described electric power system or guard interval in output according to described actuating quantity and described action ratio.

15. a method that is used to detect the fault of the electric power system with guard interval comprises:

Step at distolateral configuration first photocurrent sensor of the guard interval of described electric power system;

The step of the size of one distolateral first electric current that flows through of the guard interval by the described electric power system of the described first photocurrent sensor perception;

Step at another distolateral configuration second photocurrent sensor of the guard interval of described electric power system;

The step of the size of second electric current that the other end effluent of the guard interval by the described electric power system of the described second photocurrent sensor perception is crossed;

Obtain step as the spill current output of the difference of described first electric current and described second electric current;

Obtain as described first electric current and described second electric current and with the step of electric current output;

Export the step of obtaining input and output electric current separately from output of described spill current and described and electric current;

Obtain the step of actuating quantity from described input and output electric current;

Obtain the step of amount of suppression from described input and output electric current;

Obtain the step of action ratio from described actuating quantity and described amount of suppression;

Differentiating according to described actuating quantity and described action ratio is the step of the outer fault of fault in the guard interval of described electric power system or guard interval.

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