CN106154118A - A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner and method - Google Patents
A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner and method Download PDFInfo
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- CN106154118A CN106154118A CN201610864098.4A CN201610864098A CN106154118A CN 106154118 A CN106154118 A CN 106154118A CN 201610864098 A CN201610864098 A CN 201610864098A CN 106154118 A CN106154118 A CN 106154118A
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention relates to power system Earth Fault Detection technology, it is specifically related to a kind of Single-phase Earth-fault Selection in Distribution Systems and positioner and method, including substation bus bar, substation transformer and power distribution network transmission line of electricity, it is characterized in that, the each feed line leading-out terminal being additionally included in substation bus bar installs tradition zero sequence current mutual inductor, zero-sequence current carrier signal source is installed at each transmission line of electricity of power distribution network each area segmentation node, substation bus bar is installed zero-sequence current carrier signal receptor, arc suppression coil is installed at substation transformer；Tradition zero sequence current mutual inductor gathers every power distribution network transmission line of electricity head end zero sequence current signal, for the route selection of singlephase earth fault；Zero-sequence current carrier signal source gathers the zero sequence current signal of each area segmentation node, positions for Single-phase Ground Connection Failure.That trouble point can be carried out by this device is accurate, position reliably, and the method for employing realizes simple, little to electric network influencing.
Description
Technical field
The invention belongs to power system Earth Fault Detection technical field, particularly relate to a kind of one-phase earthing failure in electric distribution network
Route selection and positioner and method.
Background technology
In 10kV/35kV power distribution network, singlephase earth fault the line is busy the 70%～80% of road total failare, be distribution system
Common fault.Accurately, reliably one-phase earthing failure in electric distribution network point is carried out route selection and location is the most necessary.
At present Position Research to distribution network failure point the most at home and abroad mainly has three kinds of methods:
1. utilizing the Fault Locating Method of outdoor fault detector, the method is by fault message before and after fault inspecting
Difference determine fault section.The fault detector of overhead transmission line is that the magnetic field produced based on measurement circuitry zero-sequence current carries out event
The equipment of barrier point detection, but owing to the Distribution of Magnetic Field of zero-sequence current and the capacitance profile of electrical network are the most relevant, therefore the method detection
Precision is the highest.
2. measure fault time circuit end points at voltage, electric current, by computational analysis judge fault distance fault location side
Method.Common are impedance method, due to reasons such as distribution network line are complicated, line impedance parameter is uneven, impedance method can only play
Reference role.
3. by system Injection Signal, it is achieved the injecting signal of fault location.The method adds high frequency at circuit head end
Signal source, realizes fault location according to each branch port transmission frequency of spectrum of function, phase place and wave character, joins due to actual
Power network line is longer, and due to reasons such as signal attenuations, detection failure effect is limited, and the method is subject in terms of actual popularization and application
A lot of restrictions.
But the localization method of above several typical distribution network failure points, exists and has an impact electrical network, positioning precision is the highest,
The problem such as inaccurate.
Summary of the invention
First purpose of the present invention is to provide one and accurately and reliably can carry out one-phase earthing failure in electric distribution network point
Route selection and the device of location.
Second object of the present invention is to provide a kind of method that trouble point is carried out location accurate, reliable route selection, the party
Method is simple, little to electric network influencing.
For realizing above-mentioned first purpose, the technical solution used in the present invention is: a kind of one-phase earthing failure in electric distribution network choosing
Line and positioner, including substation bus bar, substation transformer and power distribution network transmission line of electricity, be additionally included in substation bus bar
Each feed line leading-out terminal installs tradition zero sequence current mutual inductor, installs at each transmission line of electricity of power distribution network each area segmentation node
Zero-sequence current carrier signal source, installs zero-sequence current carrier signal receptor, on substation bus bar at substation transformer
Arc suppression coil is installed；Tradition zero sequence current mutual inductor gathers each loop line road head end zero sequence current signal, for singlephase earth fault
Route selection；Zero-sequence current carrier signal source gathers the zero sequence current signal of each area segmentation node, for singlephase earth fault
Point location.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems with positioner, zero at described each area segmentation node
Sequence current carrier signal source selects the modulated signal of different frequency, frequency range be tens of kHZ to hundreds of kHZ, and apart from power transformation
The frequency of the land segmented node zero-sequence current carrier signal source standing the nearest is the highest；The land that distance transformer station is the most remote
Segmented node zero-sequence current carrier signal source frequency is the lowest.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems with positioner, described transmission line of electricity area segmentation is several
Determine according to fault location precision and actual requirement.
For realizing above-mentioned second purpose, the technical solution used in the present invention is: Single-phase Earth-fault Selection in Distribution Systems with
The method of positioner line selection and location, comprises the following steps:
S1, Single-phase Earth-fault Selection in Distribution Systems；
Each feed line leading-out terminal at substation bus bar installs tradition zero sequence current mutual inductor, its zero-sequence current power frequency component
Deliver to transformer station's detection device by tradition zero sequence current mutual inductor secondary circuit, judge single-phase connecing by this zero sequence current signal
The circuit that earth fault occurs；
S2, one-phase earthing failure in electric distribution network point location；Comprise the following steps:
S21, each for power distribution network transmission line of electricity is carried out area segmentation according to positioning precision and actual requirement, divide in each region
Installing zero-sequence current carrier signal source at Duan Jiedian, at each area segmentation node, the zero-sequence current carrier signal source of installing selects
Different frequency modulated signal, the tens of kHZ of frequency range to hundreds of kHZ；And the land segmented node that distance transformer station is the nearest
The frequency of zero-sequence current carrier signal source is the highest, the land segmented node zero-sequence current carrier signal that distance transformer station is the most remote
Source frequency is the lowest；
S22, by gathering the zero-sequence current of each segmented node, and based on carrier wave principle by the amplitude of zero-sequence current, phase
Position information passes to transformer station's zero-sequence current carrier signal receptor, detects the amplitude of the zero-sequence current of each node, phase place
Information；
S23, the zero-sequence current amplitude between arc suppression coil compensation, trouble point and transformer station, phase place change, logical
Crossing the amplitude of zero-sequence current of each segmented node, the phase place change information analyzed transformer station and detect, single-phase to circuit connects
Earth fault point positions.
Beneficial effects of the present invention: distribution network failure point can be carried out accurate, position reliably, the method for employing realizes
Simply, little to electric network influencing.
Accompanying drawing explanation
Fig. 1 is two groups of outlet system construction drawings of one embodiment of the invention 10kV/35kV bus；
Fig. 2 is one embodiment of the invention zero-sequence current carrier signal source topology diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described in detail.
The example of described embodiment is shown in the drawings, and the most same or similar label represents identical or class
As element or there is the element of same or like function.The embodiment described below with reference to accompanying drawing is exemplary, only
For explaining the present invention, and it is not construed as limiting the claims.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.For letter
Changing disclosure of the invention, hereinafter parts and setting to specific examples are described.They are the most merely illustrative, and purpose is not
It is to limit the present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.This repeat be for
Simplify and clearly purpose, itself do not indicate the relation between discussed various embodiment and/or setting.Additionally, this
Bright various specific technique and the example of material of providing, but those of ordinary skill in the art are it can be appreciated that other technique
Applicability and/or the use of other materials.It addition, fisrt feature described below second feature it " on " structure permissible
The embodiment directly contacted is formed as, it is also possible to include that other feature is formed at first and second including the first and second features
Embodiment between feature, such first and second features are not likely to be directly contact.
In description of the invention, it should be noted that unless otherwise prescribed and limit, term " be connected " " connection " should do extensively
Reason and good sense solution, for example, it may be mechanically connected or electrical connection, it is also possible to be the connection of two element internals, can be to be joined directly together,
Can also be indirectly connected to by intermediary, for the those of ordinary skill in phase field, can understand as the case may be
The concrete meaning of above-mentioned term.
The technical scheme that following example use: a kind of Single-phase Earth-fault Selection in Distribution Systems and positioner, including becoming
Power station bus, substation transformer and power distribution network transmission line of electricity, each feed line leading-out terminal being additionally included in substation bus bar is installed
Tradition zero sequence current mutual inductor, installs zero-sequence current carrier signal at each transmission line of electricity of power distribution network each area segmentation node
Source, installs zero-sequence current carrier signal receptor on substation bus bar, installs arc suppression coil at substation transformer；Tradition
Zero sequence current mutual inductor gathers each loop line road head end zero sequence current signal, for the route selection of singlephase earth fault；Zero-sequence current carries
Ripple signal source gathers the zero sequence current signal of each area segmentation node, positions for Single-phase Ground Connection Failure.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems with positioner, zero at described each area segmentation node
Sequence current carrier signal source selects the modulated signal of different frequency, frequency range be tens of kHZ to hundreds of kHZ, and apart from power transformation
The frequency of the land segmented node zero-sequence current carrier signal source standing the nearest is the highest；The land that distance transformer station is the most remote
Segmented node zero-sequence current carrier signal source frequency is the lowest.Described transmission line of electricity area segmentation number according to fault location precision and
Actual requirement determines.
Single-phase Earth-fault Selection in Distribution Systems and the method for positioner line selection and location, comprise the following steps:
S1, Single-phase Earth-fault Selection in Distribution Systems；
Each feed line leading-out terminal at substation bus bar installs tradition zero sequence current mutual inductor, its zero-sequence current power frequency component
Deliver to transformer station's detection device by tradition zero sequence current mutual inductor secondary circuit, judge single-phase connecing by this zero sequence current signal
The circuit that earth fault occurs；
S2, one-phase earthing failure in electric distribution network point location；Comprise the following steps:
S21, each for power distribution network transmission line of electricity is carried out area segmentation according to positioning precision and actual requirement, divide in each region
Installing zero-sequence current carrier signal source at Duan Jiedian, at each area segmentation node, the zero-sequence current carrier signal source of installing selects
Different frequency modulated signal, the tens of kHZ of frequency range to hundreds of kHZ；And the land segmented node that distance transformer station is the nearest
The frequency of zero-sequence current carrier signal source is the highest, the land segmented node zero-sequence current carrier signal that distance transformer station is the most remote
Source frequency is the lowest；
S22, by gathering the zero-sequence current of each segmented node, and based on carrier wave principle by the amplitude of zero-sequence current, phase
Position information passes to transformer station's zero-sequence current carrier signal receptor, detects the amplitude of the zero-sequence current of each node, phase place
Information；
S23, the zero-sequence current amplitude between arc suppression coil compensation, trouble point and transformer station, phase place change, logical
Crossing the amplitude of zero-sequence current of each segmented node, the phase place change information analyzed transformer station and detect, single-phase to circuit connects
Earth fault point positions.
Embodiment 1
During as it is shown in figure 1, be embodied as, each feed line leading-out terminal at substation bus bar installs tradition zero sequence current mutual inductance
Device, gathers the zero sequence current signal of each loop line road head end, singlephase earth fault is carried out route selection.
Owing to power distribution network transmission line of electricity is longer, each loop line road is carried out area segmentation, the number of this area segmentation be by
Required fault location precision and actual requirement determine.One zero-sequence current carrier signal is installed at each area segmentation node
Source, extracts the zero-sequence current of regional segmented node by zero-sequence current carrier signal source, and based on carrier wave principle by this joint
The point amplitude of zero-sequence current, phase information pass at the zero-sequence current carrier signal receptor that transformer station installs, and can become
The zero-sequence current phase place of each node, amplitude information is collected at power station.Due to through arc suppression coil compensation, trouble point and power transformation
Zero-sequence current amplitude, phase place between standing can change, by analyzing the width of the zero-sequence current of each node that transformer station collects
Value, phase place change information, it is possible to the Single-phase Ground Connection Failure of power distribution network transmission line of electricity is positioned.Every circuit not same district
The frequency of the zero-sequence current carrier signal source at the segmented node of territory is different, and frequency band range: tens of kHZ to hundreds of kHZ, for avoiding mixing
Frequently phenomenon, the line node carrier frequency the nearest apart from transformer station is the highest, the line node carrier frequency that distance transformer station is the most remote
The lowest.
As in figure 2 it is shown, zero sequence current signal can be converted into high-frequency carrier signal by zero-sequence current carrier signal source, and can lead to
Cross circuit, this circuit transmission receive at bus signal receiver.This high-frequency carrier signal contains the width of zero-sequence current
Value, phase information.By sending the PWM high-frequency controling signal of different frequency, zero-sequence current carrier signal source just can produce not
The carrier signal of same frequency.
The principle of embodiment 1 is described below in conjunction with Fig. 1:
With two groups of outlets of 10kV/35kV bus in Fig. 1, as a example by circuit 1, circuit m, depict the choosing of power distribution network single-phase earthing
Line and positioning device structure figure.
Tradition zero sequence current mutual inductor 1 and tradition zero sequence current mutual inductor is installed at the head end respectively assembling grid power transmission circuit
M, can detect circuit 1 and the zero-sequence current of circuit m head end respectively.
Every circuit of power distribution network is divided into n region, a zero-sequence current is installed at each area segmentation node and carries
Zero-sequence current carrier signal source m-1 on ripple signal source 1-1～1-n, circuit m～m-n.These zero-sequence current carrier signal source can
Transfer zero sequence current signal to high-frequency carrier signal.Length according to each bar circuit is different, can be divided into different as required
Areal, the n of the most each bar circuit can be different.
Zero-sequence current carrier signal for avoiding mixing phenomenon, at every power distribution network transmission line of electricity zones of different segmented node
Source selects the modulated signal of different frequency, its frequency range: tens of kHZ to hundreds of kHZ, the line node that distance transformer station is the nearest
Frequency is the highest, and the line node frequency the most remote apart from transformer station is the lowest.I.e. each frequency in figure is had:
f1＞ f2＞ ＞ fn (1)
Due to circuit, bus after breaking down, loop can be formed, thus high-frequency carrier signal can be for delivery to mother
Receive at line receiver, thus extract the phase place of each node, amplitude information.
Arc suppression coil is installed at substation transformer, by regulation arc suppression coil, can compensate trouble point to bus it
Between the zero-sequence current of circuit so that bus can change to the zero-sequence current amplitude between trouble point, phase information, based on
This, the amplitude of zero sequence current signal of each node that can be extracted by analysis, phase place change information, it is fixed to carry out trouble point
Position.
Embodiment 2
Assume to be divided into circuit 17 area segmentation, i.e. for circuit 1, n=7.Regional segmented node
The signal frequency of zero-sequence current carrier signal source is respectively f1=100kHz, f2=90kHz, f3=80kHz, f4=70kHz, f5=
60kHz、f6=50kHz, f7=40kHz.
It is now assumed that singlephase earth fault occurs in the 3rd region of circuit 1.By regulation arc suppression coil compensation, trouble point and
Zero-sequence current amplitude, phase place between bus can change, i.e. tradition zero sequence current mutual inductor 1, zero-sequence current carrier wave letter in figure
Number source 1-1, zero-sequence current carrier signal source 1-2, zero-sequence current carrier signal source 1-3 have zero sequence current signal amplitude, phase place
Change.
The zero-sequence current information detected by tradition zero sequence current mutual inductor 1～m, it can be determined that singlephase earth fault is sent out
Raw at circuit 1.
The high-frequency carrier signal extracted by isolated-phase buses signal receiver, it appeared that frequency f7～f4At 40kHZ～
High-frequency carrier signal amplitude between 70kHZ, phase place are not changed in；More than 50kHZ, (i.e. frequency is more than f to frequency3) high frequency carry
Ripple signal amplitude, phase place there occurs change, it can be determined that trouble point is in the region 3 of circuit 1.
It should be appreciated that the part that this specification does not elaborates belongs to prior art.
Although describing the detailed description of the invention of the present invention above in association with accompanying drawing, but those of ordinary skill in the art should
Understanding, these are merely illustrative of, and these embodiments can be made various deformation or amendment, former without departing from the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. Single-phase Earth-fault Selection in Distribution Systems and a positioner, including substation bus bar, substation transformer and distribution
Net transmission line of electricity, it is characterised in that each feed line leading-out terminal being additionally included in substation bus bar installs tradition zero sequence current mutual inductance
Device, installs zero-sequence current carrier signal source, at each transmission line of electricity of power distribution network each area segmentation node on substation bus bar
Zero-sequence current carrier signal receptor is installed, arc suppression coil is installed at substation transformer；Tradition zero sequence current mutual inductor is adopted
Collect each loop line road head end zero sequence current signal, for the route selection of singlephase earth fault；Zero-sequence current carrier signal source gathers each
The zero sequence current signal of area segmentation node, positions for Single-phase Ground Connection Failure.
2. Single-phase Earth-fault Selection in Distribution Systems as claimed in claim 1 and positioner, it is characterised in that described each district
Zero-sequence current carrier signal source at the segmented node of territory selects the modulated signal of different frequency, and frequency range is that tens of kHZ is to number
Hundred kHZ, and the frequency of the nearest land segmented node zero-sequence current carrier signal source of distance transformer station is the highest；Distance power transformation
The land segmented node zero-sequence current carrier signal source frequency standing the most remote is the lowest.
3. Single-phase Earth-fault Selection in Distribution Systems as claimed in claim 1 and positioner, it is characterised in that described power transmission line
Road area segmentation number determines according to fault location precision and actual requirement.
4. the method utilizing the Single-phase Earth-fault Selection in Distribution Systems described in claim 1 and positioner line selection and location, it is special
Levy and be, comprise the following steps:
S1, Single-phase Earth-fault Selection in Distribution Systems；
Each feed line leading-out terminal at substation bus bar installs tradition zero sequence current mutual inductor, and its zero-sequence current power frequency component passes through
Tradition zero sequence current mutual inductor secondary circuit delivers to transformer station's detection device, judges single-phase earthing event by this zero sequence current signal
The circuit that barrier occurs；
S2, one-phase earthing failure in electric distribution network point location；Comprise the following steps:
S21, each for power distribution network transmission line of electricity is carried out area segmentation according to positioning precision and actual requirement, save at each area segmentation
Installing zero-sequence current carrier signal source at Dian, at each area segmentation node, the zero-sequence current carrier signal source of installing selects difference
Frequency modulated signal, the tens of kHZ of frequency range to hundreds of kHZ；And the land segmented node zero sequence that distance transformer station is the nearest
The frequency in current carrier signal source is the highest, the land segmented node zero-sequence current carrier signal source frequency that distance transformer station is the most remote
Rate is the lowest；
S22, by gathering the zero-sequence current of each segmented node, and based on carrier wave principle by the amplitude of zero-sequence current, phase place letter
Breath passes to transformer station's zero-sequence current carrier signal receptor, detects the amplitude of the zero-sequence current of each node, phase information；
S23, the zero-sequence current amplitude between arc suppression coil compensation, trouble point and transformer station, phase place change, by dividing
Analyse the amplitude of zero-sequence current of each segmented node, phase place change information that transformer station detects, the single-phase earthing event to circuit
Barrier point positions.
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| CN201610864098.4A CN106154118B (en) | 2016-09-29 | 2016-09-29 | Power distribution network single-phase earth fault line selection and positioning device and method |
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| CN106959402A (en) * | 2017-05-03 | 2017-07-18 | 国网安徽省电力公司培训中心 | A kind of Little Current Ground Connection System and determination methods |
| CN107942203A (en) * | 2018-01-09 | 2018-04-20 | 济南大学 | A kind of small current earthing wire-selecting method for strengthening fault signature |
| CN107966633A (en) * | 2017-11-15 | 2018-04-27 | 国网宁夏电力公司电力科学研究院 | The one-phase earthing failure in electric distribution network circuit quick judgment method and system of a kind of electric power system |
| CN108872779A (en) * | 2017-08-28 | 2018-11-23 | 武汉都市环保工程技术股份有限公司 | A kind of single-phase earth fault line selection device and method |
| CN109444565A (en) * | 2018-05-24 | 2019-03-08 | 天津大学 | A kind of single-phase permanent fault recognition methods based on voltage-phase fluctuation characteristic |
| CN109557419A (en) * | 2018-12-13 | 2019-04-02 | 国网山西省电力公司大同供电公司 | A kind of transmission line faultlocating method |
| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
| CN114252720A (en) * | 2021-12-22 | 2022-03-29 | 广东电网有限责任公司 | Bus fault diagnosis method and device, computer equipment and storage medium |
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| CN106959402A (en) * | 2017-05-03 | 2017-07-18 | 国网安徽省电力公司培训中心 | A kind of Little Current Ground Connection System and determination methods |
| CN108872779A (en) * | 2017-08-28 | 2018-11-23 | 武汉都市环保工程技术股份有限公司 | A kind of single-phase earth fault line selection device and method |
| CN107966633A (en) * | 2017-11-15 | 2018-04-27 | 国网宁夏电力公司电力科学研究院 | The one-phase earthing failure in electric distribution network circuit quick judgment method and system of a kind of electric power system |
| CN107942203B (en) * | 2018-01-09 | 2020-02-07 | 济南大学 | Low-current grounding line selection method for enhancing fault characteristics |
| CN107942203A (en) * | 2018-01-09 | 2018-04-20 | 济南大学 | A kind of small current earthing wire-selecting method for strengthening fault signature |
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| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN114089107A (en) * | 2021-11-16 | 2022-02-25 | 国网福建省电力有限公司南平供电公司 | Capacitor line selection method for grounding of central point of transformer substation for single-phase grounding fault disposal |
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| CN114252720A (en) * | 2021-12-22 | 2022-03-29 | 广东电网有限责任公司 | Bus fault diagnosis method and device, computer equipment and storage medium |
| CN114252720B (en) * | 2021-12-22 | 2023-08-22 | 广东电网有限责任公司 | Bus fault diagnosis method and device, computer equipment and storage medium |
| CN117375247A (en) * | 2023-12-07 | 2024-01-09 | 武汉中楚柏泰智能科技有限公司 | Current signal saturation amplification high-frequency modulation and transmission system capable of achieving wide-range self-power-taking |
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