CN102023277A - Homonymic phase inter-line fault phase selection method of four-parallel line on same tower based on twelve-sequence component - Google Patents

Abstract

The invention discloses a homonymic phase inter-line fault phase selection method of a four-parallel line on the same tower based on a twelve-sequence component, belonging to the technical field of urgent protective circuit devices. The method comprises: a signal is acquired by a phase selecting element, the acquired signal is calculated, and fault recognition is carried out according to the calculated result. The method is characterized by comprising the following steps: acquiring the twelve-phase current amount of a four-parallel line at the part on which a relay protection device is arranged to serve as the original current amount required by the phase selecting element; then matrixing the twelve-phase current amount array phasor quantity of the four-parallel line to obtain a twelve-sequence current component; and finally, fault recognition is carried out by utilizing the size of each sequence component and the phase relation. The invention has the advantages that the influence of mutual inductance of the four-parallel line on the same tower is overcome, high sensitivity is provided by utilizing the fault characteristics of the four-parallel line on the same tower and the basic concept of the symmetrical component method and adopting the modern signal processing technology. The homonymic phase inter-line fault phase selection method of the four-parallel line on the same tower based on the twelve-sequence component can be widely used in the relay protective field of the bilateral power four-parallel line on the same tower for a high voltage or super high voltage electric transmission and transformation network.

Description

Based on same bar four loop lines of 12 preface components with famous prime minister's cross line fault phase-selecting method

Technical field

The invention belongs to emergency protective circuit device field, relate in particular to the phase-selecting method when taking place with famous prime minister's cross line fault with bar four back transmission lines in a kind of relay protection system/device.

Background technology

Along with China's power system development, the power construction land used is more and more rare, and construction cost is more and more higher.Under such background, electric system begins to adopt with bar four loop line roads as the high-voltage transmission circuit, and four loop lines will more and more be used in the evolution afterwards.

With bar four back transmission lines, its circuit topology is mainly high pressure and extra high voltage network as shown in Figure 1, has with bar four loop lines that transmission line corridor is narrow, the characteristics of conservation of power construction land.

For the system of same bar four loop lines of bilateral power supply shown in Figure 1, protective relaying device is installed in bus M place, and every circuit contains three-phase, always has 12 phase circuits.

As shown in Figure 2, promptly there are 12 transmission lines of electricity that are coupled mutually on each loop line road that it is detailed.12 preface components can be realized decoupling zero completely.

With bar four loop line roads, there is mutual inductance between the three-phase on not only every loop line road, the also frame on four loop line roads makes and also has mutual inductance between each loop line road that this makes the fault analysis on four loop line roads become very complicated.

Simultaneously, with the also increase greatly of failure mode of bar four loop lines, it comprises single line down and cross line fault.Wherein, cross line fault is of a great variety, and follows for general cross line fault is almost irregular.

Yet the same famous prime minister's cross-line earth fault for occurring on the two loop line roads can find some special relations to realize selecting phase by analysis.

The day for announcing is on June 7th, 2006, " a kind of phase-selecting method that compares the phase of failed phase current differentiation based on false voltage " disclosed in the Chinese patent of notification number CN 1258849C, its method comprises step: confirm that cross line fault is separate, this can realize with the comparison or the phase current size step relatively of voltage between phases size; Confirm fault type, can come the failure judgement type by the current and phase difference angle that compares the cross-line two-phase; Confirm the fault phase, after obtaining fault type, need to judge which is the fault phase mutually,, think that then the electric current big person of two cross-lines in separate is the fault phase if confirm as single-phase fault; If confirm as phase-to phase fault, then these two cross-lines are the fault phase mutually, correctly select the phase problem when it has solved double-circuit lines on the same pole generation cross line fault and evolved fault.

Yet, because the existence of mutual inductance in the four loop line roads, traditional fault phase-selecting method that is used for single back line will be subjected to very big influence when being used on four loop lines, so the key of four loop line road fault phase-selecting methods will search out a kind of isolated component that not influenced by mutual inductance exactly, and utilize the feature of this isolated component to realize selecting phase.

Tian Yu, people such as Fan Chunju are at " Automation of Electric Systems " (Vol.31, No.21, Nov.10,2007) " with the bar 4 loop lines 12 preface component methods " delivered on, this article obtains two new voltages by the row phasor of forming with each phase voltage of bar four loop lines and electric current be multiply by a transformation matrix respectively, electric current row phasor, be voltage, electric current 12 preface components, and the impedance matrix of forming through self-impedance and each transimpedance of four loop lines after this conversion becomes a diagonal matrix, thereby cancellation the mutual inductance between four loop lines, so not coupling is separate between the 12 preface components that obtain.

From above-mentioned narration as can be seen, 12 preface components are symmetrical components with the expansion in bar four loop lines.In addition, this literary composition has also illustrated physical significance and each sequence voltage of each preface component, characteristics of current, and corresponding each sequence network of the system that obtains.But, this literary composition further do not relate to 12 preface components that it proposed in power system fault analysis application and only limit to derive 12 preface components itself.

Summary of the invention

Technical matters to be solved by this invention provides a kind of same bar four loop lines based on 12 preface components with famous prime minister's cross line fault phase-selecting method.It has overcome the influence with bar four loop line mutual inductances, utilizes with the fault characteristic of bar four loop lines and the key concept of symmetrical component method, and adopts the modern signal processing technology, makes it have very high sensitivity.

Technical scheme of the present invention is: provide a kind of same bar four loop lines based on 12 preface components with famous prime minister's cross line fault phase-selecting method; comprise option element acquired signal in the protective relaying device, acquired signal analyzed/calculated and carries out the identification of fault according to analysis/result of calculation, it is characterized in that:

(1) the 12 phase current amounts on four loop line roads of collection protective relaying device installation place are as the required original electric weight of phase selection element;

(2) 12 phase current row phasors of four loop lines are done matrixing and obtain 12 preface current components;

(3) utilize the size of each preface component and phase relation to carry out the identification of fault.

Further, the identification of its above-mentioned fault comprises the identification and fault identification mutually of faulty line.

Concrete, the 12 phase current amounts on described four loop line roads are:

Its data sampling frequency is 3MHz.

Described 12 preface current components are

Wherein Be called e preface zero sequence respectively successively, f preface zero sequence, g preface zero sequence, h preface zero sequence, e preface positive sequence, f preface positive sequence, g preface positive sequence, h preface positive sequence, e preface negative phase-sequence, f preface negative phase-sequence, g preface negative phase-sequence and h preface negative-sequence current.Its described matrixing is:

$M=\left[\begin{array}{cccccccccccc}1& 1& 0& 0& 1& 1& 0& 0& 1& 1& 0& 0\\ 1& 1& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0\\ 1& 1& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0\\ 1& -1& 1& 0& 1& -1& 1& 0& 1& -1& 1& 0\\ 1& -1& 1& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0\\ 1& -1& 1& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0\\ 1& 0& -1& 1& 1& 0& -1& 1& 1& 0& -1& 1\\ 1& 0& -1& 1& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}\\ 1& 0& -1& 1& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2\\ 1& 0& 0& -1& 1& 0& 0& -1& 1& 0& 0& -1\\ 1& 0& 0& -1& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2& \mathrm{\α}& 0& 0& -\mathrm{\α}\\ 1& 0& 0& -1& \mathrm{\α}& 0& 0& -\mathrm{\α}& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2\end{array}\right]$

It utilizes matrix M to realize conversion between 12 phase currents and the 12 preface electric currents.

Being to be coupled mutually between the 12 above-mentioned phase currents, and not having coupling between the 12 preface electric currents, is 12 fully independently preface components, and the relation between them satisfies following equation:

$[{{\stackrel{\·}{I}}_{\mathrm{IA},}{\stackrel{\·}{I}}_{\mathrm{IB},}{\stackrel{\·}{I}}_{\mathrm{IC},}{\stackrel{\·}{I}}_{\mathrm{IIA},}{\stackrel{\·}{I}}_{\mathrm{IIB},}{\stackrel{\·}{I}}_{\mathrm{IIC},}{\stackrel{\·}{I}}_{\mathrm{IIIA},}{\stackrel{\·}{I}}_{\mathrm{IIIB},}{\stackrel{\·}{I}}_{\mathrm{IIIC},}{\stackrel{\·}{I}}_{\mathrm{IVA},}{\stackrel{\·}{I}}_{\mathrm{IVB},}{\stackrel{\·}{I}}_{\mathrm{IVC},}]}^T=M{[{\stackrel{\·}{I}}_{e0,}{\stackrel{\·}{I}}_{f0},{\stackrel{\·}{I}}_{g0,}{\stackrel{\·}{I}}_{h0,}{\stackrel{\·}{I}}_{e1},{\stackrel{\·}{I}}_{f1,}{\stackrel{\·}{I}}_{g1,}{\stackrel{\·}{I}}_{h1,}{\stackrel{\·}{I}}_{e2,}{\stackrel{\·}{I}}_{f2,}{\stackrel{\·}{I}}_{g2,}{\stackrel{\·}{I}}_{h2,}]}^T.$

Concrete, the identification decision of above-mentioned faulty line is according to as follows:

(α) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) greater than g ₁Half of preface electric current

Just represent I, cross line fault takes place in II loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{e1}-\frac{1}{2}{I}_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (2);

(b) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and g ₁(the I of preface electric current _G1) and greater than f ₁Preface electric current (I _F1), just represent I, cross line fault takes place in III loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{e1}-I_{f1}+I_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (3);

(c) when detecting e ₁Preface electric current (I _E1) and h ₁Half of preface electric current

Sum is greater than f ₁Half of preface electric current

Simultaneously, g ₁Preface electric current (I _G1) greater than f ₁Half of preface electric current With h ₁Half of preface electric current

And, just represent I, cross line fault takes place in IV loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-\frac{1}{2}{I}_{f1}+\frac{1}{2}{I}_{h1}>\mathrm{\ϵ}\\ I_{g1}-\frac{1}{2}{I}_{f1}-\frac{1}{2}{I}_{h1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (4);

(d) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, just represents II, cross line fault takes place in III loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{e1}+I_{f1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (5);

(e) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) and greater than zero, simultaneously, e ₁Preface electric current (I _E1) and h ₁Preface electric current (I _H1) sum is greater than g ₁Preface electric current (I _G1), just represent II, cross line fault takes place in IV loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}+I_{f1}>\mathrm{\ϵ}\\ I_{g1}-I_{g1}+I_{h1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (6);

(f) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, simultaneously, e ₁Preface electric current (I _E1) and g ₁Half of preface electric current

Sum is then represented III greater than zero, between the IV loop line cross line fault takes place;

That is: $\left.\begin{array}{c}{I}_{e1}+I_{f1}>\mathrm{\ϵ}\\ I_{e1}+\frac{1}{2}{I}_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (7);

Wherein ε is a threshold value, and it is neglected parameters such as the electric pressure of electrical network and system impedance greatly and chooses.

Just can determine the two loop line roads that cross line fault takes place according to relational expression (2)～(7).

Concrete, the identification of above-mentioned fault phase is specific as follows:

(α ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2), just represent A-A cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{e0}>\mathrm{\ϵ}\\ I_{e1}-I_{e2}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (8);

(b ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α (α I doubly _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2), just represent B-B cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-{{\mathrm{\α}}^{2}I}_{e2}>\mathrm{\ϵ}\\ I_{e1}-\mathrm{\α}{I}_{e0}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (9);

Wherein, $\mathrm{\α}=\frac{1}{2}+j\frac{\sqrt{3}}{2},$ ${\mathrm{\α}}^2=-\frac{1}{2}-j\frac{\sqrt{3}}{2};$

(c ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α ²(α doubly ²I _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2) α times (α I _E2), just represent C-C cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-{{\mathrm{\α}}^{2}I}_{e2}>\mathrm{\ϵ}\\ I_{e1}-\mathrm{\α}{I}_{e0}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (10);

(d ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α (α I doubly _E1) and e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2) sum is greater than zero, just represents AB-AB cross-line earth fault;

That is: I _E0+ α I _E1+ α ²I _E2＞ε relational expression (11);

(e ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α ²(α doubly ²I _E1) and e ₂Preface electric current (I _E2) rotation alpha times (α I _E2) sum is greater than zero, just represents AC-AC cross-line earth fault;

That is: I _E0+ α ²I _E1+ α I _E2＞ε relational expression (12);

(f ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) and e ₂Preface electric current (I _E2) sum is greater than zero, just represents BC-BC cross-line earth fault;

That is: I _E0+ I _E1+ I _E2＞ε relational expression (13).

Fault phase in the time of promptly can identifying with famous prime minister's cross-line earth fault according to relational expression (8)～(13).

Each phase electric weight that the described phase-selecting method of technical solution of the present invention does not directly adopt the protection installation place to record realizes that fault selects phase; but utilize independently each preface component; the transition resistance at used failure boundary condition of relation and fault place is irrelevant between each preface component; thereby the mutually used criterion of fault choosing is also irrelevant with transition resistance, has theoretic anti-fully transition resistance.

Compared with the prior art, advantage of the present invention is:

1. utilize independently each preface component as calculatings/comparison foundation, have nothing to do, have theoretic anti-fully transition resistance with the transition resistance at fault place;

2. calculating/comparison has been avoided with the influence of bar four loop line mutual induction amount to relay protection system according to irrelevant with the size with bar four loop line mutual induction amount;

3. utilize with the fault characteristic of bar four loop lines and the key concept of symmetrical component method, and adopt the modern signal processing technology, make it have very high sensitivity and reliability.

Description of drawings

Fig. 1 is with bar four back transmission line circuit topology synoptic diagram;

Fig. 2 is the correlationship synoptic diagram of 12 each electric signal of phase circuit;

Fig. 3 is the method schematic block diagram of the technical program.

Embodiment

The present invention will be further described below in conjunction with drawings and Examples.

Shown in Fig. 1, be the system of same bar four loop lines of bilateral power supply, protective device is installed in bus M place, and every circuit contains three-phase, always has 12 phase circuits.

With the system of bar four loop lines, be mainly high pressure and extra high voltage network, have with bar four loop lines that transmission line corridor is narrow, the characteristics of conservation of power construction land.

Various symbols and mark among the figure are the standard mask method of this area, and the engineering technical personnel of this area can understand and understand its represented implication fully, no longer narrate at this.

Among Fig. 2, the system of same bar four loop lines of bilateral power supply, the transmission line of electricity that has 12 phases (in other words, having 12) to be coupled mutually constitutes.

Wherein, for loop I, its three-phase current is I _IA, I _IBAnd I _IC, the impedance between the three-phase line is Z _m, the direction of current of total system (or claim power flow direction) be from the M effluent to the N side, the composite impedance between the circuit of whole four loops (12 phase) is Z _x

So with bar four loop line roads, have mutual inductance between the three-phase on not only every loop line road, the also frame on four loop line roads makes and also has mutual inductance between each loop line road that this makes the fault analysis on four loop line roads become very complicated.

Simultaneously, with the also increase greatly of failure mode of bar four loop lines, it comprises single line down and cross line fault.Wherein, cross line fault is of a great variety, and follows for general cross line fault is almost irregular.

Yet, because the existence of mutual inductance in the four loop line roads, traditional fault phase-selecting method that is used for single back line will be subjected to very big influence when being used on four loop lines, so the key of four loop line road fault phase-selecting methods will search out a kind of isolated component that not influenced by mutual inductance exactly, and utilize the feature of this isolated component to realize selecting phase.

Among Fig. 3; provided the technical program based on same bar four loop lines of 12 preface components with famous prime minister's cross line fault phase-selecting method; comprise option element acquired signal in the protective relaying device, acquired signal analyzed/calculated and carries out the identification of fault according to analysis/result of calculation that its invention main points are:

(1) the 12 phase current amounts on four loop line roads of collection protective relaying device installation place are as the required original electric weight of phase selection element;

(2) 12 phase current row phasors of four loop lines are done matrixing and obtain 12 preface current components;

(3) utilize the size of each preface component and phase relation to carry out the identification of fault.

Further, the identification of its above-mentioned fault comprises the identification and fault identification mutually of faulty line.

Concrete, the 12 phase current amounts on described four loop line roads are:

Its data sampling frequency is 3MHz.

Described 12 preface current components are

Wherein

Be called e preface zero sequence respectively successively, f preface zero sequence, g preface zero sequence, h preface zero sequence, e preface positive sequence, f preface positive sequence, g preface positive sequence, h preface positive sequence, e preface negative phase-sequence, f preface negative phase-sequence, g preface negative phase-sequence and h preface negative-sequence current.

Its described matrixing is:

$M=\left[\begin{array}{cccccccccccc}1& 1& 0& 0& 1& 1& 0& 0& 1& 1& 0& 0\\ 1& 1& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0\\ 1& 1& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0\\ 1& -1& 1& 0& 1& -1& 1& 0& 1& -1& 1& 0\\ 1& -1& 1& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0\\ 1& -1& 1& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0\\ 1& 0& -1& 1& 1& 0& -1& 1& 1& 0& -1& 1\\ 1& 0& -1& 1& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}\\ 1& 0& -1& 1& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2\\ 1& 0& 0& -1& 1& 0& 0& -1& 1& 0& 0& -1\\ 1& 0& 0& -1& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2& \mathrm{\α}& 0& 0& -\mathrm{\α}\\ 1& 0& 0& -1& \mathrm{\α}& 0& 0& -\mathrm{\α}& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2\end{array}\right]$

It utilizes matrix M to realize conversion between 12 phase currents and the 12 preface electric currents.

Being to be coupled mutually between the 12 above-mentioned phase currents, and not having coupling between the 12 preface electric currents, is 12 fully independently preface components, and the relation between them satisfies following equation:

$[{{\stackrel{\·}{I}}_{\mathrm{IA},}{\stackrel{\·}{I}}_{\mathrm{IB},}{\stackrel{\·}{I}}_{\mathrm{IC},}{\stackrel{\·}{I}}_{\mathrm{IIA},}{\stackrel{\·}{I}}_{\mathrm{IIB},}{\stackrel{\·}{I}}_{\mathrm{IIC},}{\stackrel{\·}{I}}_{\mathrm{IIIA},}{\stackrel{\·}{I}}_{\mathrm{IIIB},}{\stackrel{\·}{I}}_{\mathrm{IIIC},}{\stackrel{\·}{I}}_{\mathrm{IVA},}{\stackrel{\·}{I}}_{\mathrm{IVB},}{\stackrel{\·}{I}}_{\mathrm{IVC},}]}^T=M{[{\stackrel{\·}{I}}_{e0,}{\stackrel{\·}{I}}_{f0},{\stackrel{\·}{I}}_{g0,}{\stackrel{\·}{I}}_{h0,}{\stackrel{\·}{I}}_{e1},{\stackrel{\·}{I}}_{f1,}{\stackrel{\·}{I}}_{g1,}{\stackrel{\·}{I}}_{h1,}{\stackrel{\·}{I}}_{e2,}{\stackrel{\·}{I}}_{f2,}{\stackrel{\·}{I}}_{g2,}{\stackrel{\·}{I}}_{h2,}]}^T.$

One, the concrete identification decision foundation/method to faulty line is as follows:

(α) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) greater than g ₁Half of preface electric current

Just represent I, cross line fault takes place in II loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{e1}-{\frac{1}{2}I}_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (2);

(b) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and g ₁(the I of preface electric current _G1) and greater than f ₁Preface electric current (I _F1), just represent I, cross line fault takes place in III loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{g1}-I_{f1}+I_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (3);

(c) when detecting e ₁Preface electric current (I _E1) and h ₁Half of preface electric current Sum is greater than f ₁Half of preface electric current

Simultaneously, g ₁Preface electric current (I _G1) greater than f ₁Half of preface electric current

With h ₁Half of preface electric current And, just represent I, cross line fault takes place in IV loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-\frac{1}{2}{I}_{f1}+\frac{1}{2}{I}_{h1}>\mathrm{\ϵ}\\ I_{g1}-\frac{1}{2}{I}_{f1}-\frac{1}{2}{I}_{h1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (4);

(d) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, just represents II, cross line fault takes place in III loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{h1}>\mathrm{\ϵ}\\ I_{e1}{+I}_{f1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (5);

(e) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) and greater than zero, simultaneously, e ₁Preface electric current (I _E1) and h ₁Preface electric current (I _H1) sum is greater than g ₁Preface electric current (I _G1), just represent II, cross line fault takes place in IV loop line road;

That is: $\left.\begin{array}{c}{I}_{e1}+I_{f1}>\mathrm{\ϵ}\\ I_{e1}-I_{g1}+I_{h1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (6);

(f) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, simultaneously, e ₁Preface electric current (I _E1) and g ₁Half of preface electric current

Sum is then represented III greater than zero, between the IV loop line cross line fault takes place;

That is: $\left.\begin{array}{c}{I}_{e1}+I_{f1}>\mathrm{\ϵ}\\ I_{e1}+\frac{1}{2}{I}_{g1}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (7);

Wherein ε is a threshold value, and it is neglected parameters such as the electric pressure of electrical network and system impedance greatly and chooses.

Just can determine the two loop line roads that cross line fault takes place according to relational expression (2)～(7).

Because 12 above-mentioned preface components can be realized decoupling zero completely, then when same famous prime minister's cross line fault on two loop lines takes place in four loop line roads, when cross line fault occurs in wherein on the two loop line roads, e, f, there is a relationship characteristic in g between the h preface, and when cross line fault occurs on the other two loop line roads, e, f, then there is another relationship characteristic in g between the h preface.So which two loop line road what utilize different relationship characteristics and can determine the generation cross line fault is.

Two, the concrete identification decision foundation/method to the fault phase is as follows:

(α ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2), just represent A-A cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-I_{e0}>\mathrm{\ϵ}\\ I_{e1}-I_{e2}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (8);

(b ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α (α I doubly _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2), just represent B-B cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-{{\mathrm{\α}}^{2}I}_{e2}>\mathrm{\ϵ}\\ I_{e1}-\mathrm{\α}{I}_{e0}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (9);

Wherein, $\mathrm{\α}=\frac{1}{2}+j\frac{\sqrt{3}}{2},$ ${\mathrm{\α}}^2=-\frac{1}{2}-j\frac{\sqrt{3}}{2};$

(c ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α ²(α doubly ²I _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2) α times (α I _E2), just represent C-C cross-line earth fault;

That is: $\left.\begin{array}{c}{I}_{e1}-{{\mathrm{\α}}^{2}I}_{e2}>\mathrm{\ϵ}\\ I_{e1}-\mathrm{\α}{I}_{e0}>\mathrm{\ϵ}\end{array}\right\}$ Relational expression (10);

(d ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α (α I doubly _E1) and e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2) sum is greater than zero, just represents AB-AB cross-line earth fault;

That is: I _E0+ α I _E1+ α ²I _E2＞ε relational expression (11);

(e ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α ²(α doubly ²I _E1) and e ₂Preface electric current (I _E2) rotation alpha times (α I _E2) sum is greater than zero, just represents AC-AC cross-line earth fault;

That is: I _E0+ α ²I _E1+ α I _E2＞ε relational expression (12);

(f ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) and e ₂Preface electric current (Ie ₂) sum is greater than zero, just represents BC-BC cross-line earth fault;

That is: I _E0+ I _E1+ I _E2＞ε relational expression (13).

Fault phase in the time of promptly can identifying with famous prime minister's cross-line earth fault according to relational expression (8)～(13).

Can be according to the same famous prime minister's that cross-line takes place separate difference: A-A cross-line, B-B cross-line, C-C cross-line, AB-AB cross-line AC-AC cross-line and BC-BC cross-line being divided into famous prime minister's cross-line.

The boundary condition of the cross line fault of this several types is carried out matrixing finally obtain relationship characteristic between each preface component.

It is closely similar that unbalanced fault takes place on relationship characteristic merchandiser loop line road between each preface component.

As single loop line A phase earth fault takes place, during B phase earth fault, just negative, the electric current of zero sequence all equates; And when the A-A cross line fault takes place on four loop line roads, have, e1, e2, e0 preface electric current equates; When the BC double earthfault took place for single loop line, just, negative, the zero-sequence current sum was equalling zero, and four loop lines are when the BC-BC cross line fault takes place, e1, and e2, e0 preface electric current sum equals zero.

Cross line fault for other kind also has the similar feature of similar and single line down relation.

Because other parts of technical solution of the present invention relay protection system; such as phase selection element, to 12 phase current row phasors carry out matrixing with realize between 12 phase currents and the 12 preface electric currents conversion, to the size and the phase relation of each preface component calculate/compare, the output of last result of determination and selection, setting and the course of action thereof of concrete protective relaying device, be the state of the art.

Those of ordinary skill in the art, after fully understanding and understood essentiality content of the present invention and creative thinking, need not to reproduce the technical program through performing creative labour, so the contents such as principle, connection plan and course of action of above-mentioned prior art are no longer narrated at this.

Each phase electric weight that the described phase-selecting method of technical solution of the present invention does not directly adopt the protection installation place to record realizes that fault selects phase; but utilize independently each preface component; the transition resistance at used failure boundary condition of relation and fault place is irrelevant between each preface component; thereby the mutually used criterion of fault choosing is also irrelevant with transition resistance, has theoretic anti-fully transition resistance.

Embodiment:

Content in conjunction with the inventive method provides following emulation embodiment:

The present invention utilizes electromagnetic transient simulation program EMTP to carry out a large amount of emulation experiments.Realistic model and simulation result are as follows.

Analogue system is the both-end transmission system of 330kV grade, and merit angle, two ends is 30 degree, and the long 200KM in four loop line roads adopts distributed parameter model.

The partial results of emulation is shown among the following table:

As seen from Table 1, the present invention has done emulation to the various same famous prime minister's cross line faults through different grounding resistance ground connection that occur on the different loop lines road, and " correctly " expression fault that emulation determined in the table is consistent with the fault of reality.

Result from table as can be seen, four loop lines based on 12 preface components that the present invention proposes have very high reliability with famous prime minister's cross line fault phase-selecting method.

The present invention can be widely used in the relay protection field of the bilateral power supply of high pressure/ehv power transmission net with bar four loop line systems.

Claims (9)

1. One kind based on same bar four loop lines of 12 preface components with famous prime minister's cross line fault phase-selecting method, comprise option element acquired signal in the protective relaying device, acquired signal analyzed/calculated and carries out the identification of fault according to analysis/result of calculation, it is characterized in that:

   (1) the 12 phase current amounts on four loop line roads of collection protective relaying device installation place are as the required original electric weight of phase selection element;

   (2) 12 phase current row phasors of four loop lines are done matrixing and obtain 12 preface current components;

   (3) utilize the size of each preface component and phase relation to carry out the identification of fault.
2. According to described same bar four loop lines based on 12 preface components of claim 1 with famous prime minister's cross line fault phase-selecting method, the identification that it is characterized in that described fault comprises the identification and fault identification mutually of faulty line.
3. According to described same bar four loop lines based on 12 preface components of claim 1 with famous prime minister's cross line fault phase-selecting method, it is characterized in that the 12 phase current measurings on described four loop line roads are:

   Its data sampling frequency is 3MHz.
4. According to described same bar four loop lines based on 12 preface components of claim 1 with famous prime minister's cross line fault phase-selecting method, it is characterized in that described 12 preface current components are

   

   Wherein

   

   Be called e preface zero sequence respectively successively, f preface zero sequence, g preface zero sequence, h preface zero sequence, e preface positive sequence, f preface positive sequence, g preface positive sequence, h preface positive sequence, e preface negative phase-sequence, f preface negative phase-sequence, g preface negative phase-sequence and h preface negative-sequence current.
5. According to described same bar four loop lines based on 12 preface components of claim 1 with famous prime minister's cross line fault phase-selecting method, it is characterized in that described matrixing is:

   $M=\left[\begin{array}{cccccccccccc}1& 1& 0& 0& 1& 1& 0& 0& 1& 1& 0& 0\\ 1& 1& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0\\ 1& 1& 0& 0& \mathrm{\α}& \mathrm{\α}& 0& 0& {\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& 0\\ 1& -1& 1& 0& 1& -1& 1& 0& 1& -1& 1& 0\\ 1& -1& 1& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0\\ 1& -1& 1& 0& \mathrm{\α}& -\mathrm{\α}& \mathrm{\α}& 0& {\mathrm{\α}}^2& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& 0\\ 1& 0& -1& 1& 1& 0& -1& 1& 1& 0& -1& 1\\ 1& 0& -1& 1& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}\\ 1& 0& -1& 1& \mathrm{\α}& 0& -\mathrm{\α}& \mathrm{\α}& {\mathrm{\α}}^2& 0& -{\mathrm{\α}}^2& {\mathrm{\α}}^2\\ 1& 0& 0& -1& 1& 0& 0& -1& 1& 0& 0& -1\\ 1& 0& 0& -1& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2& \mathrm{\α}& 0& 0& -\mathrm{\α}\\ 1& 0& 0& -1& \mathrm{\α}& 0& 0& -\mathrm{\α}& {\mathrm{\α}}^2& 0& 0& -{\mathrm{\α}}^2\end{array}\right]$

   It utilizes matrix M to realize conversion between 12 phase currents and the 12 preface electric currents.
6. According to described same bar four loop lines based on 12 preface components of claim 1 with famous prime minister's cross line fault phase-selecting method, it is characterized in that between described 12 phase currents it being to be coupled mutually, and there is not coupling between the 12 preface electric currents, be 12 fully independently preface components, the relation between them satisfies following equation:

   $[{{\stackrel{\·}{I}}_{\mathrm{IA},}{\stackrel{\·}{I}}_{\mathrm{IB},}{\stackrel{\·}{I}}_{\mathrm{IC},}{\stackrel{\·}{I}}_{\mathrm{IIA},}{\stackrel{\·}{I}}_{\mathrm{IIB},}{\stackrel{\·}{I}}_{\mathrm{IIC},}{\stackrel{\·}{I}}_{\mathrm{IIIA},}{\stackrel{\·}{I}}_{\mathrm{IIIB},}{\stackrel{\·}{I}}_{\mathrm{IIIC},}{\stackrel{\·}{I}}_{\mathrm{IVA},}{\stackrel{\·}{I}}_{\mathrm{IVB},}{\stackrel{\·}{I}}_{\mathrm{IVC},}]}^T=M{[{\stackrel{\·}{I}}_{e0,}{\stackrel{\·}{I}}_{f0},{\stackrel{\·}{I}}_{g0,}{\stackrel{\·}{I}}_{h0,}{\stackrel{\·}{I}}_{e1},{\stackrel{\·}{I}}_{f1,}{\stackrel{\·}{I}}_{g1,}{\stackrel{\·}{I}}_{h1,}{\stackrel{\·}{I}}_{e2,}{\stackrel{\·}{I}}_{f2,}{\stackrel{\·}{I}}_{g2,}{\stackrel{\·}{I}}_{h2,}]}^T.$
7. According to claim 1 or 2 described same bar four loop lines based on 12 preface components with famous prime minister's cross line fault phase-selecting method, it is characterized in that the identification of described faulty line is specific as follows:

   (α) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) greater than g ₁Half of preface electric current

   

   Just represent I, cross line fault takes place in II loop line road;

   (b) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and g ₁(the I of preface electric current _G1) and greater than f ₁Preface electric current (I _F1), just represent I, cross line fault takes place in III loop line road;

   (c) when detecting e ₁Preface electric current (I _E1) and h ₁Half of preface electric current

   

   Sum is greater than f ₁Half of preface electric current Simultaneously, g ₁Preface electric current (I _G1) greater than f ₁Half of preface electric current With h ₁Half of preface electric current

   

   And, just represent I, cross line fault takes place in IV loop line road;

   (d) when detecting e ₁Preface electric current (I _E1) greater than h ₁Preface electric current (I _H1), simultaneously, e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, just represents II, cross line fault takes place in III loop line road;

   (e) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) and greater than zero, simultaneously, e ₁Preface electric current (I _E1) and h ₁Preface electric current (I _H1) sum is greater than g ₁Preface electric current (I _G1), just represent II, cross line fault takes place in IV loop line road;

   (f) when detecting e ₁Preface electric current (I _E1) and f ₁Preface electric current (I _F1) sum is greater than zero, simultaneously, e ₁Preface electric current (I _E1) and g ₁Half of preface electric current

   

   Sum is then represented III greater than zero, between the IV loop line cross line fault takes place;

   Wherein ε is a threshold value, and it is neglected parameters such as the electric pressure of electrical network and system impedance greatly and chooses.
8. According to claim 1 or 2 described same bar four loop lines based on 12 preface components with famous prime minister's cross line fault phase-selecting method, it is characterized in that the identification of described fault phase is specific as follows:

   (α ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2), just represent A-A cross-line earth fault;

   (b ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α (α I doubly _E0), simultaneously, e ₁Preface electric current (I _E1) greater than e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2), just represent B-B cross-line earth fault;

   Wherein, $\mathrm{\α}=\frac{1}{2}+j\frac{\sqrt{3}}{2},$ ${\mathrm{\α}}^2=-\frac{1}{2}-j\frac{\sqrt{3}}{2};$

   (c ') is when detecting e ₁Preface electric current (I _E1) greater than e ₀Preface electric current (I _E0) α ²(α doubly ²I _E0), simultaneously, e ₁Preface electric current (I _EI) greater than e ₂Preface electric current (I _E2) α times (α I _E2), just represent C-C cross-line earth fault;

   (d ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α (α I doubly _E1) and e ₂Preface electric current (I _E2) α ²(α doubly ²I _E2) sum is greater than zero, just represents AB-AB cross-line earth fault;

   (e ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) α ²(α doubly ²I _E1) and e ₂Preface electric current (I _E2) rotation alpha times (α I _E2) sum is greater than zero, just represents AC-AC cross-line earth fault;

   (f ') is when detecting e ₀Preface electric current (I _E0) and e ₁Preface electric current (I _E1) and e ₂Preface electric current (I _E2) sum is greater than zero, just represents BC-BC cross-line earth fault.
9. According to described same bar four loop lines based on 12 preface components of one of claim 1～8 with famous prime minister's cross line fault phase-selecting method; it is characterized in that each phase electric weight that described phase-selecting method does not directly adopt the protection installation place to record realizes that fault selects phase; but utilize independently each preface component; the transition resistance at used failure boundary condition of relation and fault place is irrelevant between each preface component; thereby the mutually used criterion of fault choosing is also irrelevant with transition resistance, has theoretic anti-fully transition resistance.

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