CN111751659B - Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram - Google Patents
Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram Download PDFInfo
- Publication number
- CN111751659B CN111751659B CN202010603749.0A CN202010603749A CN111751659B CN 111751659 B CN111751659 B CN 111751659B CN 202010603749 A CN202010603749 A CN 202010603749A CN 111751659 B CN111751659 B CN 111751659B
- Authority
- CN
- China
- Prior art keywords
- phase
- zero
- transmission line
- waveform
- current waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0007—Frequency selective voltage or current level measuring
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a method for judging zero-phase current wiring of a wave recorder based on a power grid fault wave recording diagram, which comprises the steps of obtaining the power transmission line fault wave recording diagram, wherein three-phase current waveforms, three-phase voltage waveforms of a bus, zero-sequence current waveforms and zero-sequence voltage waveforms of the power transmission line are formed on the power transmission line fault wave recording diagram; if the three-phase current waveform, the three-phase voltage waveform of the bus, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line have sudden change waveforms, the existence of the ground fault is determined; and judging the zero-phase current connection of the wave recorder as an external access polar end mode or an external access non-polar end mode according to the phase difference of any phase of the current waveform of the power transmission line with mutation in the three-phase current waveform of the power transmission line and the waveform with mutation in the zero-sequence current waveform at the same mutation starting moment. The method and the device do not need mathematical calculation, are simple and intuitive, save time and labor, and can solve the problem that field technicians cannot quickly judge the zero-phase current wiring mode of the oscillograph.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method and a system for judging zero-phase current wiring of a wave recorder based on a power grid fault wave recording diagram.
Background
In an electric power system, analog quantity of a wave recorder needs to be acquired through an external wiring mode, if construction personnel are not familiar with a field or design ideas of design drawings in a project, the wiring mode is diversified, so that the phenomenon that wave recording graphs acquired by a fault wave recorder are inconsistent can exist, and therefore results analyzed according to the wave recording graphs are different, and great influence can be brought to fault judgment.
At present, the zero-phase current wiring of the wave recorder is inconsistent, specifically, an external access polar terminal mode or an external access non-polar terminal mode. Under the normal operation condition, the three-phase currents of the two connection modes are basically balanced, and the zero-sequence current is very small, so that the zero-sequence current fluctuation is difficult to perceive. Once a line of a current system has a ground fault, zero sequence current mutation occurs, and at the moment, because the polarity ends into which the zero sequence current flows are inconsistent, the zero sequence current displayed by a oscillograph has 180-degree phase direction change, which easily causes the analyzed results to have difference.
However, in actual work on site, construction personnel face many types of faults, and if the construction personnel are unfamiliar with site wiring, the analyzed result is a result of five types of faults, and the fault is often misled, and finally a great amount of personnel need to be dispatched to find the fault on site, so that a great amount of manpower and material resources are wasted.
In order to solve the problem that field technicians cannot quickly judge the zero-phase current wiring mode of the wave recorder, the inventor provides a method for judging the zero-phase current wiring mode of the wave recorder based on a power grid fault wave recording diagram, which is simple and intuitive, time-saving and labor-saving and does not need mathematical calculation.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for judging zero-phase current wiring of a wave recorder based on a power grid fault wave recording diagram, which is simple and intuitive, time-saving and labor-saving without mathematical calculation and can solve the problem that field technicians cannot quickly judge the zero-phase current wiring mode of the wave recorder.
In order to solve the technical problem, an embodiment of the present invention provides a method for determining zero-phase current connection of a wave recorder based on a power grid fault wave recording diagram, where the method includes the following steps:
step S1, obtaining a transmission line fault oscillogram, wherein a transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform and a zero-sequence voltage waveform are formed on the transmission line fault oscillogram;
step S2, if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform of the bus, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line, the existence of the ground fault is determined;
and step S3, judging the zero-phase current connection of the wave recorder to be in an external access polar end mode or an external access non-polar end mode according to the phase difference of any phase of electric transmission line current waveform mutated in the three-phase current waveform of the electric transmission line and the waveform mutated in the zero-sequence current waveform at the same mutation starting moment.
Wherein, the step S3 specifically includes:
if the phase difference of any phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 0 degrees, judging that the zero-phase current connection of the wave recorder is in a mode of externally accessing a non-polar end;
and if the phase difference between the current waveform of any phase of the transmission line with the sudden change in the three-phase current waveform of the transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 180 degrees, judging that the zero-phase current wiring of the wave recorder is in an external access polarity end mode.
And the amplitude of each phase of power transmission line current waveform mutated in the three-phase current waveform of the power transmission line is increased compared with the amplitude of each power transmission line current waveform before mutation.
And the amplitude of each phase of bus voltage waveform with sudden change in the bus three-phase voltage waveform is reduced compared with the amplitude of each phase of bus voltage waveform before sudden change.
The embodiment of the invention also provides a system for judging zero-phase current wiring of a wave recorder based on the power grid fault wave recording diagram, which comprises the following steps:
the power transmission line fault recording diagram acquisition unit is used for acquiring a power transmission line fault recording diagram, wherein a power transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform and a zero-sequence voltage waveform are formed on the power transmission line fault recording diagram;
the ground fault detection unit is used for determining that a ground fault exists if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line;
and the zero-phase current connection mode judging unit is used for judging that the zero-phase current connection of the wave recorder is in an external access polar end mode or an external access non-polar end mode according to the phase difference of any phase of electric transmission line current waveform mutated in the three-phase current waveform of the electric transmission line and the waveform mutated in the zero-phase current waveform at the same mutation starting moment.
Wherein the zero-phase current wiring manner determination unit includes:
the first wiring judgment module is used for judging that the zero-phase current wiring of the wave recorder is in a mode of externally accessing a non-polar end if the phase difference of any one phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 0 degree;
and the second wiring judgment module is used for judging that the zero-phase current wiring of the wave recorder is in an external access polarity end mode if the phase difference between any phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 180 degrees.
And the amplitude of each phase of power transmission line current waveform mutated in the three-phase current waveform of the power transmission line is increased compared with the amplitude of each power transmission line current waveform before mutation.
And the amplitude of each phase of bus voltage waveform with sudden change in the bus three-phase voltage waveform is reduced compared with the amplitude of each phase of bus voltage waveform before sudden change.
The embodiment of the invention has the following beneficial effects:
the invention detects whether the earth fault exists by identifying whether the three-phase current waveform, the three-phase voltage waveform, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line in the power transmission line fault oscillogram have the sudden change waveforms, and visually determines the zero-phase current wiring mode of the oscillograph by identifying the phase difference of any one phase of the power transmission line current waveform and the sudden change waveform in the zero-sequence current waveform at the same sudden change starting moment when the earth short circuit fault exists.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic connection diagram of an oscillograph according to an embodiment of the present invention, which adopts an external connection polarity terminal mode;
fig. 2 is a schematic connection diagram of an oscillograph according to an embodiment of the present invention, which adopts an external non-polar terminal access manner;
fig. 3 is a flowchart of a method for determining zero-phase current connection of a wave recorder based on a power grid fault wave recording diagram according to an embodiment of the present invention;
fig. 4 is a transmission line fault oscillogram acquired by a wave recorder in a manner of externally accessing a polarity end when a phase-B ground fault exists in a transmission line in an application scenario of a method for judging zero-phase current connection of the wave recorder based on a power grid fault oscillogram provided by the embodiment of the invention;
fig. 5 is a transmission line fault recording diagram acquired by a transmission line fault recording diagram in a manner that a zero-phase current connection line is externally connected to a non-polar terminal when a transmission line has a B-phase ground fault in an application scenario of a method for judging zero-phase current connection of a wave recorder based on a power grid fault recording diagram provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a zero-phase current connection structure of a wave recorder based on a power grid fault wave recording diagram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The inventor finds that the internal connection of the wave recorder belongs to a three-phase four-wire system connection, when an external access polar end mode (as shown in fig. 1) is adopted, once a B-phase grounding fault occurs in a power system, an external induction current flows into a non-polar end from a polar end of a B-phase induction coil in the wave recorder and flows out from a polar end from an N-phase non-polar end, so that after protection is started, a B-phase current waveform and a zero-sequence current waveform have sudden change, a phase difference formed by the B-phase current waveform and the zero-sequence current waveform at the same sudden change starting time is 180 degrees, namely, a phase change of 180 degrees is formed by the sudden change waveform in the B-phase current waveform and the sudden change waveform in the zero-sequence current waveform at the same sudden change starting time. Meanwhile, when the external access non-polar end mode (as shown in fig. 2) is adopted, once a fault of a B-phase grounding of the power system occurs, an external induction current flows into the non-polar end from the polar end of the B-phase induction coil in the wave recorder and flows out from the non-polar end, and then flows into the non-polar end from the polar end of the N-phase, so that after protection starting, the B-phase current waveform and the zero-sequence current waveform are subjected to sudden change, and the phase difference formed by the two at the same sudden change starting time is 0 degrees, namely the sudden change waveform in the B-phase current waveform at the same sudden change starting time is the same as the sudden change waveform in the zero-sequence current waveform.
According to the above findings, as shown in fig. 3, in the embodiment of the present invention, the inventor proposes a method for determining zero-phase current connection of a wave recorder based on a grid fault wave recording diagram, where the method includes the following steps:
step S1, obtaining a transmission line fault oscillogram, wherein a transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform and a zero-sequence voltage waveform are formed on the transmission line fault oscillogram;
step S2, if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform of the bus, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line, the existence of the ground fault is determined;
and step S3, judging the zero-phase current connection of the wave recorder to be in an external access polar end mode or an external access non-polar end mode according to the phase difference of any phase of electric transmission line current waveform mutated in the three-phase current waveform of the electric transmission line and the waveform mutated in the zero-sequence current waveform at the same mutation starting moment.
In step S1, acquiring a transmission line fault recording diagram through a wave recorder and importing the transmission line fault recording diagram into computer equipment, so that the computer equipment can fetch various transmission line fault recording diagrams at any time; the transmission line fault recording graph comprises, but is not limited to, transmission line three-phase current waveforms, bus three-phase voltage waveforms, zero-sequence current waveforms, zero-sequence voltage waveforms and the like, and also comprises protection switching value waveforms and line voltage waveforms.
In step S2, determining whether there is a sudden change in the waveform of each phase according to the amplitude changes in the three-phase current waveform of the transmission line and the three-phase voltage waveform of the bus, and determining whether there is a sudden change in the waveform according to the amplitude changes in the zero-sequence current waveform and the zero-sequence voltage waveform; if the amplitude of a certain phase current waveform is suddenly increased within a certain period of time, namely the position of a peak or a trough on a current curve exceeds the position of the peak or the trough of an original curve, the phase current waveform is determined to have sudden change; if the amplitude of a certain phase voltage waveform suddenly decreases within a certain period of time, namely the position of a peak or a trough on a voltage curve lags behind the peak or the trough of the original curve, the phase voltage waveform is determined to have sudden change;
and if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform of the bus, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line, the existence of the ground fault is determined. The amplitude of each phase of power transmission line current waveform which is suddenly changed in the three-phase current waveform of the power transmission line is increased compared with the amplitude of each power transmission line current waveform before sudden change; and the amplitude of each phase bus voltage waveform with sudden change in the bus three-phase voltage waveform is reduced compared with the amplitude of each phase bus voltage waveform before sudden change.
In step S3, after the existence of the ground fault is determined, the computer device identifies various abrupt waveforms on the transmission line fault oscillogram, and can visually determine the zero-phase current connection mode of the oscillograph according to the phase difference between any one of the abrupt transmission line current waveforms in the three-phase current waveforms of the identified transmission line and the abrupt waveform in the zero-sequence current waveform at the same abrupt start time. It can be understood that the transmission line fault recording graph can be directly identified through manpower or naked eyes, the zero-phase current wiring mode of the recorder is visually judged, the whole process does not need mathematical calculation, and the method is simple, visual and time-saving and labor-saving.
The specific process of visually judging whether the zero-phase current connection of the wave recorder is in the external access polar end mode or the external access non-polar end mode is as follows:
(1) if the phase difference of any phase of the current waveform of the power transmission line with mutation in the three-phase current waveform of the power transmission line and the waveform with mutation in the zero-sequence current waveform at the same mutation starting moment is 0 degrees, judging that the zero-phase current connection of the wave recorder is in a mode of externally accessing a non-polar end;
(2) and if the phase difference of any phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 180 degrees, judging that the zero-phase current wiring of the wave recorder is in an external access polarity end mode.
Note that the abrupt change start time is a protection operation start time, and may be determined by a protection switching value waveform, or may be determined by an instant time of each abrupt change waveform.
As shown in fig. 4 and fig. 5, an application scenario of the method for determining zero-phase current connection of a wave recorder based on a power grid fault wave recording diagram according to the embodiment of the present invention is further described:
the transmission line fault recording diagram comprises protection switching value (including starting, transmitting, receiving, tripping and closing) waveforms, transmission line three-phase currents IA, IB and IC waveforms, bus three-phase voltages UA, UB and UC waveforms, zero-sequence current I0 waveforms, zero-sequence voltage U0 waveforms and line voltage Ux waveforms. Meanwhile, for convenience of reading, a voltage scale, a current scale and a time scale are marked on the transmission line fault oscillogram.
In fig. 4, the transmission line is considered to have a B-phase grounding fault if the transmission line has a sudden change of the current waveform in the B-phase IB channel of the transmission line, a sudden change of the voltage waveform in the B-phase UB channel of the bus, a sudden change of the current waveform in the I0 channel of the zero-sequence current waveform, and a sudden change of the voltage waveform in the U0 channel of the zero-sequence voltage waveform.
At this time, since the phase difference between the sudden change current waveform in the B-phase IB channel of the transmission line and the sudden change current waveform in the I0 channel of the zero-sequence current waveform at the same sudden change starting time (e.g., the sudden change moment in the starting waveform of the protection switching value) is 180 °, both disappear after lasting for 60 milliseconds (due to the protection trip outlet cut-off switch), and thus it is determined that the zero-phase current connection of the wave recorder is the external access polarity end mode, as shown in fig. 1.
In fig. 5, the transmission line is considered to have a B-phase grounding fault if the transmission line has a sudden change of the current waveform in the B-phase IB channel of the transmission line, a sudden change of the voltage waveform in the B-phase UB channel of the bus, a sudden change of the current waveform in the I0 channel of the zero-sequence current waveform, and a sudden change of the voltage waveform in the U0 channel of the zero-sequence voltage waveform.
At this time, since the phase difference between the sudden change current waveform in the B-phase IB channel of the power transmission line and the sudden change current waveform in the I0 channel of the zero-sequence current waveform at the same sudden change starting time (e.g., the sudden change moment in the starting waveform of the protection switching value) is 0 °, both disappear after lasting for 60 milliseconds (the reason is that the trip outlet cut-off switch is protected), and thus it is determined that the zero-phase current connection of the wave recorder is the external access non-polar end mode, as shown in fig. 2.
As shown in fig. 6, in an embodiment of the present invention, a system for determining a zero-phase current connection of a wave recorder based on a power grid fault wave recording diagram includes:
the transmission line fault oscillogram acquiring unit 110 is configured to acquire a transmission line fault oscillogram, where a transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform, and a zero-sequence voltage waveform are formed on the transmission line fault oscillogram;
the ground fault detection unit 120 is used for a ground fault detection unit and is used for determining that a ground fault exists if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line;
and the zero-phase current connection mode determination unit 130 is configured to determine that the zero-phase current connection of the wave recorder is an external access polar end mode or an external access non-polar end mode according to a phase difference between any one phase of power transmission line current waveform mutated in the three-phase current waveform of the power transmission line and the waveform mutated in the zero-phase current waveform at the same mutation starting time.
The zero-phase current connection mode determining unit 130 includes:
the first wiring judgment module 1301 is configured to judge that zero-phase current wiring of the wave recorder is an external access non-polar end mode if a phase difference between any one of abrupt change of three-phase current waveforms of the power transmission line and an abrupt change of zero-sequence current waveforms at the same abrupt change starting time is 0 °;
a second connection determining module 1302, configured to determine that the zero-phase current connection of the wave recorder is an external access polarity end mode if a phase difference between any one of the abrupt change of the three-phase current waveforms of the power transmission line and an abrupt change of the zero-sequence current waveform at the same abrupt change starting time is 180 °.
And the amplitude of each phase of power transmission line current waveform mutated in the three-phase current waveform of the power transmission line is increased compared with the amplitude of each power transmission line current waveform before mutation.
And the amplitude of each phase of bus voltage waveform with sudden change in the bus three-phase voltage waveform is reduced compared with the amplitude of each phase of bus voltage waveform before sudden change.
The embodiment of the invention has the following beneficial effects:
the invention detects whether the earth fault exists by identifying whether the three-phase current waveform, the three-phase voltage waveform, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line in the power transmission line fault oscillogram have the sudden change waveforms, and visually determines the zero-phase current wiring mode of the oscillograph by identifying the phase difference of any one phase of the power transmission line current waveform and the sudden change waveform in the zero-sequence current waveform at the same sudden change starting moment when the earth short circuit fault exists.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. A zero-phase current wiring method of a wave recorder is judged based on a power grid fault wave recording diagram, and is characterized by comprising the following steps:
step S1, obtaining a transmission line fault oscillogram, wherein a transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform and a zero-sequence voltage waveform are formed on the transmission line fault oscillogram;
step S2, if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform of the bus, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line, the existence of the ground fault is determined;
step S3, according to the phase difference of any phase of the current waveform of the power transmission line with mutation in the three-phase current waveform of the power transmission line and the waveform with mutation in the zero-sequence current waveform at the same mutation starting moment, judging that the zero-phase current connection of the wave recorder is in an external access polar end mode or an external access non-polar end mode;
if the phase difference of any phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 0 degrees, judging that the zero-phase current connection of the wave recorder is in a mode of externally accessing a non-polar end;
and if the phase difference between the current waveform of any phase of the transmission line with the sudden change in the three-phase current waveform of the transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 180 degrees, judging that the zero-phase current wiring of the wave recorder is in an external access polarity end mode.
2. The method for judging zero-phase current connection of the wave recorder based on the power grid fault wave recording diagram of claim 1, wherein amplitudes of the current waveforms of each phase of the power transmission line with the sudden change in the three-phase current waveforms of the power transmission line are increased compared with amplitudes of the current waveforms of the power transmission line before the sudden change.
3. The method for determining zero-phase current connection of a wave recorder based on a grid fault wave recording diagram of claim 1, wherein the bus voltage waveforms of each phase with sudden change in the bus three-phase voltage waveforms are all reduced in amplitude compared with the bus voltage waveforms before the respective sudden change.
4. The utility model provides a judge oscillograph zero phase current wiring system based on electric wire netting trouble oscillograph which characterized in that includes:
the power transmission line fault recording diagram acquisition unit is used for acquiring a power transmission line fault recording diagram, wherein a power transmission line three-phase current waveform, a bus three-phase voltage waveform, a zero-sequence current waveform and a zero-sequence voltage waveform are formed on the power transmission line fault recording diagram;
the ground fault detection unit is used for determining that a ground fault exists if abrupt waveforms exist in the three-phase current waveform, the three-phase voltage waveform, the zero-sequence current waveform and the zero-sequence voltage waveform of the power transmission line;
the zero-phase current connection mode judging unit is used for judging that the zero-phase current connection of the wave recorder is in an external access polar end mode or an external access non-polar end mode according to the phase difference of any phase of electric transmission line current waveform mutated in the three-phase current waveform of the electric transmission line and the waveform mutated in the zero-sequence current waveform at the same mutation starting moment;
the zero-phase current connection mode determination unit specifically includes:
the first wiring judgment module is used for judging that the zero-phase current wiring of the wave recorder is in a mode of externally accessing a non-polar end if the phase difference of any one phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 0 degree;
and the second wiring judgment module is used for judging that the zero-phase current wiring of the wave recorder is in an external access polarity end mode if the phase difference between any phase of the current waveform of the power transmission line with the sudden change in the three-phase current waveform of the power transmission line and the sudden change in the zero-sequence current waveform at the same sudden change starting moment is 180 degrees.
5. The grid fault oscillogram-based judgment oscillograph zero-phase current connection system as claimed in claim 4, wherein the amplitudes of the abrupt change of the transmission line current waveforms in each phase of the transmission line three-phase current waveforms are increased compared with the amplitudes of the transmission line current waveforms before the respective abrupt changes.
6. The grid fault oscillogram-based judgment oscillograph zero-phase current connection system of claim 5, wherein the bus voltage waveforms of each phase having an abrupt change in the bus three-phase voltage waveforms are all reduced in amplitude compared to the bus voltage waveforms before the respective abrupt change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603749.0A CN111751659B (en) | 2020-06-29 | 2020-06-29 | Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603749.0A CN111751659B (en) | 2020-06-29 | 2020-06-29 | Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111751659A CN111751659A (en) | 2020-10-09 |
| CN111751659B true CN111751659B (en) | 2021-12-14 |
Family
ID=72676892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010603749.0A Active CN111751659B (en) | 2020-06-29 | 2020-06-29 | Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111751659B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438213U (en) * | 2009-07-16 | 2010-04-14 | 华东电力试验研究院有限公司 | Electronic current transformer polarity measurement system |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN104535956A (en) * | 2014-11-26 | 2015-04-22 | 国家电网公司 | Method for detecting wiring/polarity correctness of secondary opening delta loop of potential transformer |
| CN105182156A (en) * | 2015-09-05 | 2015-12-23 | 国家电网公司 | Waveform visualization based same-period loop polarity detection apparatus and detection method |
| CN106291240A (en) * | 2016-08-08 | 2017-01-04 | 上海金智晟东电力科技有限公司 | The electrical power distribution network fault location method that Same Name of Ends attribute is checked |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2719732B2 (en) * | 1990-06-06 | 1998-02-25 | 関西電力株式会社 | Method and apparatus for determining ground fault failure cause in high-voltage distribution line |
| JP2531407B2 (en) * | 1991-07-23 | 1996-09-04 | 株式会社戸上電機製作所 | Transmission and distribution line accident diagnosis method |
| JPH1048286A (en) * | 1996-08-02 | 1998-02-20 | Sumitomo Electric Ind Ltd | Method and apparatus for locating ground fault section of isolated overhead transmission line |
| CN106786424B (en) * | 2017-01-10 | 2018-11-27 | 华北电力大学 | Send out method for pilot protection of circuit in new energy station based on current waveform similarity |
-
2020
- 2020-06-29 CN CN202010603749.0A patent/CN111751659B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201438213U (en) * | 2009-07-16 | 2010-04-14 | 华东电力试验研究院有限公司 | Electronic current transformer polarity measurement system |
| CN103123389A (en) * | 2011-11-21 | 2013-05-29 | 甘肃省电力公司定西供电公司 | Method for verifying polarity of zero-sequence current transformer |
| CN104535956A (en) * | 2014-11-26 | 2015-04-22 | 国家电网公司 | Method for detecting wiring/polarity correctness of secondary opening delta loop of potential transformer |
| CN105182156A (en) * | 2015-09-05 | 2015-12-23 | 国家电网公司 | Waveform visualization based same-period loop polarity detection apparatus and detection method |
| CN106291240A (en) * | 2016-08-08 | 2017-01-04 | 上海金智晟东电力科技有限公司 | The electrical power distribution network fault location method that Same Name of Ends attribute is checked |
Non-Patent Citations (2)
| Title |
|---|
| 35kV线路故障录波异常原因分析;洪彬倬;《贵州电力技术》;20141130;全文 * |
| 接线;朱建德;《实践电工手册》;19981231;第405页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111751659A (en) | 2020-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103080757B (en) | Device and method for detecting a ground fault | |
| CA2818183C (en) | Dual-comparator restricted earth fault protection | |
| CN111812451A (en) | Phase current transient fault component-based distributed line selection method for power distribution network | |
| CN109888729B (en) | Early warning type transformer protection method and device | |
| CN111751667B (en) | Method and system for judging current transformer saturation based on power grid fault recording diagram | |
| CN111751664A (en) | Method and system for judging grounding faults in positive and negative directions in protection based on power grid oscillogram | |
| CN111751659B (en) | Zero-phase current wiring method and system for judging wave recorder based on power grid fault wave recording diagram | |
| CN111751661A (en) | Method and system for judging ground fault based on power grid fault recording diagram | |
| CN111751668A (en) | Method and system for judging internal and external faults of bus area based on power grid fault recording graph | |
| CN117216695A (en) | XLPE cable sheath section abnormality detection device, method and equipment | |
| Sidhu et al. | A digital technique for stator winding protection of synchronous generators | |
| Zamora et al. | Verifying resonant grounding in distribution systems | |
| CN107064717B (en) | distribution network grounding line selection method adopting composite current phase detection | |
| CN113985195A (en) | Method and system for judging circuit breaker stealing tripping based on power grid fault time sequence | |
| Lu et al. | A novel location method for single-phase grounding fault in small current grounding distribution network based on difference of phase current fault component between fault and non-fault phases | |
| JP3260982B2 (en) | Harmonic measurement analysis system | |
| CN111751665A (en) | Method and system for judging phase-to-phase fault based on power grid fault recording graph | |
| CN112649694B (en) | Method for judging single-phase grounding fault of low-current grounding system | |
| CN114414944A (en) | Low-current grounding device based on phase current transient method and detection method | |
| CN110333437B (en) | Detection system and method for injection type stator grounding protection device | |
| CN111751666B (en) | Method and system for judging successive faults based on power grid fault recording graph | |
| CN112578228A (en) | Zero-sequence-independent single-phase earth fault discrimination algorithm for power distribution network | |
| Olejnik | Alternative method of determining zero-sequence voltage for fault current passage indicators in overhead medium voltage networks | |
| CN100367043C (en) | Fault selecting method by attenuated DC component | |
| RU88859U1 (en) | DEVICE FOR CENTRALIZED PROTECTION AGAINST SINGLE PHASE CIRCUIT TO THE GROUND IN A NETWORK WITH ISOLATED NEUTRAL |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |