CN103760407B

CN103760407B - The non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method

Info

Publication number: CN103760407B
Application number: CN201410053978.4A
Authority: CN
Inventors: 林富洪
Original assignee: State Grid Corp of China SGCC; State Grid Fujian Electric Power Co Ltd; Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; State Grid Fujian Electric Power Co Ltd; Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
Priority date: 2014-02-18
Filing date: 2014-02-18
Publication date: 2016-06-08
Anticipated expiration: 2034-02-18
Also published as: CN103760407A

Abstract

The invention discloses a kind of non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method. First the inventive method is measured double-circuit lines on the same pole road I and is returned the faulted phase voltage of route protection installation place, faulted phase current and zero-sequence current; calculate the zero-sequence current phase angle on II loop line road, double-circuit lines on the same pole road; calculate the zero-sequence current on II loop line road, double-circuit lines on the same pole road; then calculate the non-same famous prime minister's cross-line earth fault voltage phase angle of double-circuit line, calculate the non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line. The inventive method only uses single-ended single back line electric parameters, it is not necessary to introduce another loop line road electric parameters, and measurement result is not by the impact of power system operation mode change. The inventive method principle eliminates zero-sequence mutual inductance between line, transition resistance, the load current impact on the non-same famous prime minister's cross-line earth fault point voltage of double-circuit line and amplitude measurement precision, there is significantly high certainty of measurement.

Description

The non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method

Technical field

The present invention relates to Relay Protection Technology in Power System field, concretely relate to a kind of non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method.

Background technology

By the real-time measurement to the non-same famous prime minister's cross-line earth fault point voltage of double-circuit line, be conducive to grasping in time the non-same famous prime minister's cross-line earth fault of double-circuit line is thermally-stabilised on double-circuit lines on the same pole road and Dynamic stability affect situation, for guaranteeing that safety is run on double-circuit lines on the same pole road and the stabilization of power grids provides reliable decision-making foundation.

By the real-time measurement to the non-same famous prime minister's cross-line earth fault point voltage of double-circuit line, according to earth fault voltage magnitude size cases, the non-same famous prime minister's cross-line earth fault type of double-circuit line can be carried out inline diagnosis, there is provided reference frame for double-circuit lines on the same pole road fault line walking, win the quality time for failture evacuation and service restoration.

But; current technical field of relay protection not yet proposes a kind of measuring method that can accurately calculate double-circuit lines on the same pole Lu Feitong famous prime minister's cross-line earth fault point voltage; cannot in order to grasp in time, the non-same famous prime minister's cross-line earth fault of double-circuit line is thermally-stabilised on double-circuit lines on the same pole road, the situation that affects of Dynamic stability provides reliable basis, the non-same famous prime minister's cross-line earth fault type of double-circuit line also cannot carry out diagnosis provides foundation.

Summary of the invention

It is an object of the invention to the deficiency overcoming prior art to exist, it is provided that a kind of suitable in double-circuit lines on the same pole Lu Feitong famous prime minister's cross-line earth fault, and can accurately measure the measurement method of earth fault voltage magnitude and phase angle.

For completing above-mentioned purpose, the present invention adopts the following technical scheme that

The non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method, it is characterised in that include following sequential steps:

(1) protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFaulted phase currentAnd zero-sequence currentWherein, �� is I loop line road A phase or I loop line road B phase or I loop line road C phase;

(2) protection device calculates the zero-sequence current phase angle �� on II loop line road, double-circuit lines on the same pole road:

��=r₁+r₂-��-��

Wherein,

r_{1} = \sin^{- 1} (\frac{a_{3} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); r_{2} = \sin^{- 1} (\frac{a_{1} b_{2} - a_{2} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); a_{1} = Re (\frac{{\dot{U}}_{Iφ}}{Z_{I 1}})

b_{1} = Im (\frac{{\dot{U}}_{Iφ}}{Z_{I 1}}); a_{2} = Re ({\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0}); b_{2} = Im ({\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0}); a_{3} = b_{3} = | \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{I 0} |;

(\frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{I 0});

Z_mFor the zero-sequence mutual inductance between I loop line road, double-circuit lines on the same pole road and II loop line road, double-circuit lines on the same pole road; Z_I0Zero sequence impedance for I loop line road, double-circuit lines on the same pole road; Z_I1Positive sequence impedance for I loop line road, double-circuit lines on the same pole road; �� is I loop line road A phase or I loop line road B phase or I loop line road C phase;

(3) protection device calculates the zero-sequence current on II loop line road, double-circuit lines on the same pole road

(4) protection device calculating ground fault point voltage phase angle

Arg ({\dot{U}}_{f}) = Arg ({\dot{I}}_{I 0} + {\dot{I}}_{I 0} (\cos α + j \sin α));

(5) protection device calculating ground fault point voltage amplitude

Wherein, ��₁=Arg(Z_I1);

θ_{2} = Arg (\frac{{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}}{{\dot{I}}_{I 0} + {\dot{I}}_{II 0}}); θ_{3} = Arg (\frac{{\dot{U}}_{Iφ}}{{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}}) .

The feature of the present invention and technological achievement:

The inventive method only uses single-ended single back line electric parameters, it is not necessary to introduce another loop line road electric parameters, and measurement result is not by the impact of power system operation mode change. The inventive method principle eliminates zero-sequence mutual inductance between line, transition resistance, the load current impact on the non-same famous prime minister's cross-line earth fault point voltage of double-circuit line and amplitude measurement precision, there is significantly high certainty of measurement.

Accompanying drawing explanation

Fig. 1 is the double-circuit lines on the same pole road transmission system schematic diagram of the application present invention.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention will be further described.

Fig. 1 is the double-circuit lines on the same pole road transmission system schematic diagram of the application present invention. Protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFaulted phase currentAnd zero-sequence currentWherein, �� is I loop line road A phase or I loop line road B phase or I loop line road C phase.

Protection device calculates the zero-sequence current phase angle �� on II loop line road, double-circuit lines on the same pole road:

��=r₁+r₂-��-��

Wherein,

r_{1} = \sin^{- 1} (\frac{a_{3} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); r_{2} = \sin^{- 1} (\frac{a_{1} b_{2} - a_{2} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); a_{1} = Re (\frac{{\dot{U}}_{Iφ}}{Z_{I 1}})

b_{1} = Im (\frac{{\dot{U}}_{Iφ}}{Z_{I 1}}); a_{2} = Re ({\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0}); b_{2} = Im ({\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0}); a_{3} = b_{3} = | \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{I 0} |;

β = Arg (\frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{I 0});

Z_mFor the zero-sequence mutual inductance between I loop line road, double-circuit lines on the same pole road and II loop line road, double-circuit lines on the same pole road; Z_I0Zero sequence impedance for I loop line road, double-circuit lines on the same pole road; Z_I1Positive sequence impedance for I loop line road, double-circuit lines on the same pole road; �� is I loop line road A phase or I loop line road B phase or I loop line road C phase.

Protection device calculates the zero-sequence current on II loop line road, double-circuit lines on the same pole road

Protection device calculates double-circuit lines on the same pole road I loop line road positive sequence impedance Z_I1Phase angle theta₁=Arg(Z_I1)��

Protection device calculates

{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}

Leading

{\dot{I}}_{I 0} + {\dot{I}}_{II 0}

Phase angle

θ_{2} = Arg (\frac{{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}}{{\dot{I}}_{I 0} + {\dot{I}}_{II 0}}) .

Protection device calculates

{\dot{U}}_{Iφ}

Leading

{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}

Phase angle

θ_{3} = Arg (\frac{{\dot{U}}_{Iφ}}{{\dot{I}}_{Iφ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\dot{I}}_{I 0} + \frac{Z_{m}}{{3 Z}_{I 1}} {\dot{I}}_{II 0}}) .

Protection device calculating ground fault point voltage phase angle

Arg ({\dot{U}}_{f}) = Arg ({\dot{I}}_{I 0} + {\dot{I}}_{I 0} (\cos α + j \sin α)) .

Protection device calculating ground fault point voltage amplitude

The foregoing is only the preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.

Claims

1. the non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method, including following sequential steps:

��=r₁+r₂-��-��

Wherein,

r_{1} = \sin^{- 1} (\frac{a_{3} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); r_{2} = \sin^{- 1} (\frac{a_{1} b_{2} - a_{2} b_{1}}{\sqrt{{(a_{3} b_{1})}^{2} + {(a_{1} b_{3})}^{2}}}); a_{1} = Re (\frac{{\overset{\cdot}{U}}_{I φ}}{Z_{I 1}});

b_{1} = Im (\frac{{\overset{\cdot}{U}}_{I φ}}{Z_{I 1}}); a_{2} = Re ({\overset{\cdot}{I}}_{I φ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\overset{\cdot}{I}}_{I 0}); b_{2} = Im ({\overset{\cdot}{I}}_{I φ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\overset{\cdot}{I}}_{I 0}); a_{3} = b_{3} = | \frac{Z_{m}}{3 Z_{I 1}} {\overset{\cdot}{I}}_{I 0} |;

β = A r g (\frac{Z_{m}}{3 Z_{I 1}} {\overset{\cdot}{I}}_{I 0});

Z_mFor the zero-sequence mutual inductance between I loop line road, double-circuit lines on the same pole road and II loop line road, double-circuit lines on the same pole road; Z_I0Zero sequence impedance for I loop line road, double-circuit lines on the same pole road; Z_I1Positive sequence impedance for I loop line road, double-circuit lines on the same pole road;

(4) protection device calculating ground fault point voltage phase angle

(5) protection device calculating ground fault point voltage amplitude

Wherein,

θ_{1} = A r g (Z_{I 1}); θ_{2} = A r g (\frac{{\overset{\cdot}{I}}_{I φ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\overset{\cdot}{I}}_{I 0} + \frac{Z_{m}}{3 Z_{I 1}} {\overset{\cdot}{I}}_{I I 0}}{{\overset{\cdot}{I}}_{I 0} + {\overset{\cdot}{I}}_{I I 0}}); θ_{3} = A r g (\frac{{\overset{\cdot}{U}}_{I φ}}{{\overset{\cdot}{I}}_{I φ} + \frac{Z_{I 0} - Z_{I 1}}{Z_{I 1}} {\overset{\cdot}{I}}_{I 0} + \frac{Z_{m}}{3 Z_{I 1}} {\overset{\cdot}{I}}_{I I 0}}) .