CN105203920B - The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude - Google Patents
The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude Download PDFInfo
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Abstract
The invention discloses one kind to survey the non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line based on fault point voltage Sudden Changing Rate amplitude.The influence of zero-sequence mutual inductance calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop line road between the method for the present invention meter and line, calculate the failure front and back non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line, the range function of double-circuit lines on the same pole road I loop line road every bit is successively calculated using linear search method, reaching minimum corresponding point using range function value at the non-same famous prime minister's cross-line earth fault of double-circuit line is the non-same famous prime minister's cross-line earth fault of double-circuit line, eliminate zero-sequence mutual inductance between line, the influence of transition resistance and load current to fault localization precision, the ability influenced with very strong anti-transition resistance and load current, protect positive direction outlet that fault-free ranging dead zone when double-circuit line non-same famous prime minister's cross-line ground fault occurs, with very high one-end fault ranging precision.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of prominent based on fault point voltage
Variation amplitude surveys the non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line.
Background technique
Used in ranging electrical quantity divides, and the method for fault localization can be divided into two major classes: both-end distance measuring and single end distance measurement.
Two-terminal Fault Location method is the method for determining transmission line malfunction position using transmission line of electricity both ends electrical quantity, it is needed by logical
Road obtains opposite end electrical quantity, therefore, influence in actual use also vulnerable to both-end sampling value synchronization strong to the dependence in channel.
Single end distance measurement method is that a kind of method of transmission line malfunction position is determined merely with the voltage and current data of transmission line of electricity one end, by
An end data is only needed in it, without communication and data synchronizer, operating cost is low and algorithmic stability, therefore in mesolow line
It is widely applied in road.Currently, method of single end distance measurement is broadly divided into two classes, one kind is traveling wave method, and another kind of is impedance
Method.Traveling wave method carries out ranging using the transmission property of fault transient travelling wave, and precision is high, not by shadows such as the method for operation, excessive resistances
It rings, but very high to sample rate requirement, needs special wave recording device, do not obtain substantive application at present.Impedance method utilizes event
Voltage, the magnitude of current after barrier calculate the impedance of fault loop, carry out ranging according to the line length characteristic directly proportional to impedance, survey
It is simple and reliable away from principle, but be applied to double-circuit lines on the same pole road singlephase earth fault one-end fault ranging when, range accuracy by
It is influenced to zero-sequence mutual inductance between fault point transition resistance and line serious.There are zero-sequence mutual inductance, zero sequences between double-circuit lines on the same pole route
Mutual inductance can have an impact zero-utility theory, and then lead to impedance method distance measurement result bigger error.If double-circuit lines on the same pole
Single-phase high-impedance occurs for road, and zero-sequence mutual inductance and high transition resistance combined influence between by line, impedance method distance measurement result is usually
Beyond total track length or without distance measurement result, accurate fault location information can not be provided, causes line fault line walking difficult, it is unfavorable
It is quickly discharged and the fast quick-recovery of line powering in failure.
Summary of the invention
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind to be based on fault point voltage Sudden Changing Rate width
The value actual measurement non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line.The influence of zero-sequence mutual inductance calculates same between this method meter and line
Bar and the zero sequence compensation electric current on frame double-circuit line I loop line road, calculate the non-same famous prime minister's cross-line ground fault of double-circuit line before and after failure
Point voltage jump amount amplitude, the survey of double-circuit lines on the same pole road I loop line road every bit is successively calculated using linear search method
Away from function, reaching minimum corresponding point using range function value at the non-same famous prime minister's cross-line earth fault of double-circuit line is double loop
Lu Feitong famous prime minister's cross-line earth fault, zero-sequence mutual inductance, transition resistance and load current are to fault localization precision between eliminating line
Influence, the ability that there is very strong anti-transition resistance and load current to influence, it is non-same that double-circuit line occurs for the outlet of protection positive direction
Fault-free ranging dead zone when famous prime minister's cross-line ground fault has very high one-end fault ranging precision.
To complete above-mentioned purpose, the present invention adopts the following technical scheme:
The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude, it is special
Sign is, including following sequential steps:
(1) protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFailure
Phase currentAnd zero-sequence currentResidual voltageThe two of double-circuit lines on the same pole road I times route protection installation places of measurement are just
Normal phase voltageWherein, when the A phase of φ=I loop line road, α, β correspond to I loop line road B phase, C phase；φ=I loop line road B phase
When, α, β correspond to I loop line road C phase, A phase；When the C phase of φ=I loop line road, α, β correspond to I loop line road A phase, B phase；
(2) protective device calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop line road
Wherein,
For the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0Simultaneously for same bar
The zero sequence impedance on frame double-circuit line I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；For real part；For imaginary part；For real part；For imaginary part；J is complex operator；
(3) protective device calculates the non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line before and after failure
Wherein,For
Imaginary part；For
Imaginary part；
(4) it is l that protective device, which chooses fault distance initial value,x, calculate and return route protection apart from double-circuit lines on the same pole road I
The l of installation placexThe residual voltage of pointWherein, l is that double-circuit lines on the same pole road I returns line length；ZI0
For the zero sequence impedance on double-circuit lines on the same pole road I loop line road；
(5) protective device calculates the l that route protection installation place is gone back to apart from double-circuit lines on the same pole road IxThe range function ρ of point
(lx):
(6) fault distance lxIt is incremented by with fixed step size Δ l, return step (4) successively calculates double-circuit lines on the same pole road I and returns
Every l on routexThe range function of pointUntil double-circuit lines on the same pole road I returns total track length；Its
In, Δ l is fixed step size, can use Δ l=0.001l；L is that double-circuit lines on the same pole road I returns line length；
(7) a certain l in double-circuit lines on the same pole road I loop line road is chosenxThe corresponding range function ρ (l of pointx) value reaches minimum
Point be the non-same famous prime minister's cross-line earth fault of double-circuit line.
The features of the present invention and technological achievement:
The method of the present invention only uses single-ended single back line electrical quantity, does not need to introduce another loop line road electrical quantity, protection two
Minor loop is not gone here and there mutually independently of each other, enhances fault localization result accuracy, and fault localization precision is not by Operation of Electric Systems side
The influence of formula still has very high range accuracy when larger change occurs for power system operation mode.The method of the present invention meter and
The influence of zero-sequence mutual inductance between line eliminates influence of the zero-sequence mutual inductance to fault localization precision between line.The method of the present invention eliminates line
Between the influence of zero-sequence mutual inductance, transition resistance and load current to fault localization precision, there is very strong anti-transition resistance and load electricity
The ability influenced is flowed, fault-free ranging dead zone when double-circuit line non-same famous prime minister's cross-line ground fault occurs for the outlet of protection positive direction,
With very high one-end fault ranging precision.
Detailed description of the invention
Fig. 1 is using double-circuit lines on the same pole road transmission system schematic diagram of the invention.
Specific embodiment
Fig. 1 is using double-circuit lines on the same pole road transmission system schematic diagram of the invention.Protector measuring parallel lines on same tower
Double-circuit line I returns the faulted phase voltage of route protection installation placeFaulted phase currentAnd zero-sequence currentResidual voltageMeasure the two normal phase voltages that double-circuit lines on the same pole road I goes back to route protection installation placeWherein, φ=I loop line
When the A phase of road, α, β correspond to I loop line road B phase, C phase；When the B phase of φ=I loop line road, α, β correspond to I loop line road C phase, A phase；φ=
When the C phase of I loop line road, α, β correspond to I loop line road A phase, B phase.
The zero sequence compensation electric current on protective device calculating double-circuit lines on the same pole road I loop line road
Wherein,
For the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0Simultaneously for same bar
The zero sequence impedance on frame double-circuit line I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；φ=I loop line road
A phase, I loop line road B phase, I loop line road C phase；For real part；For imaginary part；For real part；For void
Portion；J is complex operator.
Protective device calculates the non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line before and after failure
Wherein,For
Imaginary part；For
Imaginary part.
It is l that protective device, which chooses fault distance initial value,x, calculate and return route protection peace apart from double-circuit lines on the same pole road I
L at dressxThe residual voltage of pointWherein, l is that double-circuit lines on the same pole road I returns line length；ZI0For
The zero sequence impedance on double-circuit lines on the same pole road I loop line road.
Protective device calculates the l that route protection installation place is gone back to apart from double-circuit lines on the same pole road IxThe range function ρ of point
(lx):
Fault distance lxIt is incremented by with fixed step size Δ l, successively calculates the every l in double-circuit lines on the same pole road I loop line roadxPoint
Range functionUntil double-circuit lines on the same pole road I returns total track length；Wherein, Δ l is fixed step
It is long, it can use Δ l=0.001l；L is that double-circuit lines on the same pole road I returns line length.
Choose a certain l in double-circuit lines on the same pole road I loop line roadxThe corresponding range function ρ (l of pointx) value reaches the smallest point
For the non-same famous prime minister's cross-line earth fault of double-circuit line.
The influence of zero-sequence mutual inductance calculates the zero sequence compensation electricity on double-circuit lines on the same pole road I loop line road between this method meter and line
Stream calculates the non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line before and after failure, using linear search method
The range function for successively calculating double-circuit lines on the same pole road I loop line road every bit, is connect using the non-same famous prime minister's cross-line of double-circuit line
It is the non-same famous prime minister's cross-line earth fault of double-circuit line that range function value, which reaches minimum corresponding point, at earth fault point, eliminates line
Between the influence of zero-sequence mutual inductance, transition resistance and load current to fault localization precision, there is very strong anti-transition resistance and load electricity
The ability influenced is flowed, fault-free ranging dead zone when double-circuit line non-same famous prime minister's cross-line ground fault occurs for the outlet of protection positive direction,
With very high one-end fault ranging precision.
The foregoing is merely preferred embodiments of the invention, but scope of protection of the present invention is not limited thereto, appoint
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
Claims (1)
1. surveying the non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line, feature based on fault point voltage Sudden Changing Rate amplitude
It is, including following sequential steps:
(1) protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFailure is mutually electric
StreamAnd zero-sequence currentResidual voltageMeasure the two normal phases that double-circuit lines on the same pole road I goes back to route protection installation place
VoltageWherein, when the A phase of φ=I loop line road, α, β correspond to I loop line road B phase, C phase；When the B phase of φ=I loop line road, α,
β corresponds to I loop line road C phase, A phase；When the C phase of φ=I loop line road, α, β correspond to I loop line road A phase, B phase；
(2) protective device calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop line road
Wherein,
ZmFor the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0For same bar
And the zero sequence impedance on frame double-circuit line I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；
ForReal part；ForImaginary part；ForReal part；ForImaginary part；J is complex operator；
(3) protective device calculates the non-same famous prime minister's cross-line earth fault voltage jump amount amplitude of double-circuit line before and after failure
Wherein,For
Imaginary part；For
Imaginary part；
(4) it is l that protective device, which chooses fault distance initial value,x, calculate and return route protection installation apart from double-circuit lines on the same pole road I
Locate lxThe residual voltage of pointWherein, l is that double-circuit lines on the same pole road I returns line length；ZI0For same bar
And the zero sequence impedance on frame double-circuit line I loop line road；
(5) protective device, which is calculated, returns route protection installation place l apart from double-circuit lines on the same pole road IxRange function ρ (the l of pointx):
(6) fault distance lxIt is incremented by with fixed step size Δ l, return step (4) successively calculates double-circuit lines on the same pole road I loop line road
Upper every lxThe range function of pointUntil double-circuit lines on the same pole road I returns total track length；Wherein, Δ l
For fixed step size, Δ l=0.001l is taken；L is that double-circuit lines on the same pole road I returns line length；
(7) a certain l in double-circuit lines on the same pole road I loop line road is chosenxThe corresponding range function ρ (l of pointx) value reaches the smallest point
For the non-same famous prime minister's cross-line earth fault of double-circuit line.
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| CN201510581856.7A CN105203920B (en) | 2015-09-14 | 2015-09-14 | The non-same famous prime minister's cross-line earth fault distance measurement method of double-circuit line is surveyed based on fault point voltage Sudden Changing Rate amplitude |
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| CN107576839A (en) * | 2017-09-18 | 2018-01-12 | 唐山松下产业机器有限公司 | Welding equipment, weldingvoltage detection method and device |
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| CN105785226A (en) * | 2016-03-29 | 2016-07-20 | 国网福建省电力有限公司 | Range finding method for non-homonymic phase overline earth fault of double-circuit line based on directional characteristic of position relative coefficient |
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| CN103293441A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of distributed parameters |
| CN104090213A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Double-circuit-line non-same-name phase overline ground fault positioning method |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
| CN104090200A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal amplitude value distance measurement method for double-circuit lines |
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|---|---|---|---|---|
| CN103293441A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Line single-phase earth fault single-terminal location method implemented by aid of distributed parameters |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
| CN104090200A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal amplitude value distance measurement method for double-circuit lines |
| CN104090213A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Double-circuit-line non-same-name phase overline ground fault positioning method |
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