CN104730417A - Electric transmission line single-terminal ranging method with negative sequence current as polarizing quantity - Google Patents
Electric transmission line single-terminal ranging method with negative sequence current as polarizing quantity Download PDFInfo
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- CN104730417A CN104730417A CN201510104631.2A CN201510104631A CN104730417A CN 104730417 A CN104730417 A CN 104730417A CN 201510104631 A CN201510104631 A CN 201510104631A CN 104730417 A CN104730417 A CN 104730417A
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Abstract
The invention discloses an electric transmission line single-terminal ranging method with negative sequence current as the polarizing quantity. The method comprises the following steps that a current value and a voltage value at the protection installation position of an electric transmission line are obtained and are subjected to low-pass filtering, and a current fundamental component and a voltage fundamental component with high-frequency components eliminated are obtained; the current fundamental component and the voltage fundamental component after low-pass filtering are subjected to Fourier transform, then the current value, the voltage value and the compensation voltage value are computed, and the fault distance of the electric transmission line is measured by judging whether the compensation voltage value is the same as the phase position of the negative sequence current. The electric transmission line single-terminal ranging method is not affected by load current and fault types, the ranging precision is obviously superior to that of an existing single-terminal ranging method, the offside data of the line are not needed, synchronization is not needed, new sampling values are not needed, and the calculation amount is small.
Description
Technical field
The present invention relates to a kind of method of field of relay protection in power, being specifically related to a kind of take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization.
Background technology
After transmission line of electricity breaks down, need to carry out fault localization and carry out localization of fault, the method for single end distance measurement computing formula that current power transmission circuit adopts is
In formula,
for protection installation place i phase voltage (i=A, B, C),
for protection installation place electric current (i=A, B, C), k is zero-utility theory, I
0for zero-sequence current.
This distance-finding method is by the impact of load current, and distance accuracy is not enough.
In order to overcome the impact of load current, protection installation place zero-sequence current phase place is utilized to substitute
bucking voltage is utilized to find range than mutually with zero-sequence current, but when there is phase fault, without zero-sequence component, so this distance-finding method is by the impact of fault type.
Therefore, need to provide a kind of not by the transmission line of electricity method of single end distance measurement that load current and fault type affect.
Summary of the invention
Object of the present invention is exactly to solve the problem, and providing a kind of take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, and it has not by the advantage that load current and fault type affect.
To achieve these goals, the present invention adopts following technical scheme:
Take negative-sequence current as a transmission line of electricity method of single end distance measurement for amount of polarization, comprise the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for singlephase earth fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating, and the meaning of parameters of l is fault distance.
I-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
The computing method of the ij phase bucking voltage of described step (3) are:
Take negative-sequence current as a transmission line of electricity method of single end distance measurement for amount of polarization, comprise the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for line to line fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating.
I-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
The computing method of the ij phase bucking voltage of described step (3) are:
This method is adapted to overhead transmission line
The present invention has following beneficial effect:
Transmission line of electricity method of single end distance measurement provided by the invention, is not subject to the impact of load current and fault type.Distance accuracy is significantly better than existing one-terminal data distance-finding method, and does not need circuit to side data, does not need to carry out synchronously without the need to increasing new sampled value, and calculated amount is little.
Accompanying drawing explanation
The transmission line of electricity method of single end distance measurement process flow diagram one of Fig. 1 to be a kind of based on negative-sequence current be amount of polarization;
The transmission line of electricity method of single end distance measurement flowchart 2 of Fig. 2 to be a kind of based on negative-sequence current be amount of polarization;
Fig. 3 is embodiments of the invention schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, a kind of take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, comprises the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for singlephase earth fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating, and the meaning of parameters of l is fault distance.
I-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
The computing method of the ij phase bucking voltage of described step (3) are:
As shown in Figure 2, a kind of take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, comprises the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for line to line fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating.
I-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
The computing method of the ij phase bucking voltage of described step (3) are:
Be described in further detail below in conjunction with accompanying drawing 3 pairs of the specific embodiment of the present invention.
(1) there is A phase earth fault in F1 point
I, the electric current obtaining described line protection installation place, magnitude of voltage low-pass filtering is carried out to it;
II, carry out Fourier transform and Phase-Sequence Transformation, obtain phasor
and negative-sequence current
III, calculation compensation voltage
IV, to compare
with
phase place, the Z corresponding when the two phase place is identical be protection installation place to the impedance of trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance.
(2) there is the short circuit of AB phase in F1 point
I, the electric current obtaining described line protection installation place, magnitude of voltage low-pass filtering is carried out to it;
II, carry out Fourier transform and Phase-Sequence Transformation, obtain phasor
and negative-sequence current
III, calculation compensation voltage
IV, to compare
with
phase place, the Z corresponding when the two phase place is identical be protection installation place to the impedance of trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (6)
1. be a transmission line of electricity method of single end distance measurement for amount of polarization with negative-sequence current, it is characterized in that, comprise the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for singlephase earth fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating, and the meaning of parameters of l is fault distance.
2. a kind of as claimed in claim 1 take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, it is characterized in that, the i-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
3. a kind of as claimed in claim 1 take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, and it is characterized in that, the computing method of the ij phase bucking voltage of described step (3) are:
4. be a transmission line of electricity method of single end distance measurement for amount of polarization with negative-sequence current, it is characterized in that, comprise the following steps:
Step (1): the current value and the magnitude of voltage that obtain line protection installation place, and low-pass filtering is carried out to current value and magnitude of voltage, the current first harmonics component of the high fdrequency component that is eliminated and voltage fundamental component;
Step (2): Fourier transform is carried out to the current first harmonics component after low-pass filtering and voltage fundamental component, obtains the i-th phase current
i-th phase voltage
ij phase current
ij phase voltage
i phase negative-sequence current
with ij phase negative-sequence current
i=A, B, C; Ij=AB, BC, CA;
Step (3): calculate the i-th phase bucking voltage
and ij phase bucking voltage
Step (4): for line to line fault, for given total track length counterpart impedance, compares
with
phase place,
When
with
when the two phase place is identical, corresponding Z is the impedance of protection installation place to trouble spot, l=Z/Z
1, Z
1for unit length circuit positive sequence impedance;
When
with
when both phase places are different, just reduce Z, until
with
the two phase place is identical; If when Z is 0,
with
the two phase place is still not identical, stops calculating.
5. a kind of as claimed in claim 4 take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, it is characterized in that, the i-th phase bucking voltage of described step (3)
computing method be:
the meaning of parameters of Z is impedance of adjusting,
meaning of parameters be zero-sequence current, the meaning of parameters of k is zero-utility theory.
6. a kind of as claimed in claim 4 take negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization, and it is characterized in that, the computing method of the ij phase bucking voltage of described step (3) are:
Priority Applications (1)
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|---|---|---|---|
| CN201510104631.2A CN104730417B (en) | 2015-03-10 | 2015-03-10 | It is a kind of using negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510104631.2A CN104730417B (en) | 2015-03-10 | 2015-03-10 | It is a kind of using negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization |
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Cited By (2)
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|---|---|---|---|---|
| CN111796202A (en) * | 2019-04-08 | 2020-10-20 | Abb电网瑞士股份公司 | Time domain distance protection based on polarity comparison for power transmission line |
| WO2022032492A1 (en) * | 2020-08-11 | 2022-02-17 | Abb Schweiz Ag | Method of determining line fault of power system |
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| WO2022032492A1 (en) * | 2020-08-11 | 2022-02-17 | Abb Schweiz Ag | Method of determining line fault of power system |
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| CN104730417B (en) | 2018-05-29 |
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