CN206235696U - A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner - Google Patents
A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner Download PDFInfo
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- CN206235696U CN206235696U CN201621091884.7U CN201621091884U CN206235696U CN 206235696 U CN206235696 U CN 206235696U CN 201621091884 U CN201621091884 U CN 201621091884U CN 206235696 U CN206235696 U CN 206235696U
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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 utility model is related to power system Earth Fault Detection technology, specifically related to a kind of Single-phase Earth-fault Selection in Distribution Systems and positioner, 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 for being additionally included in substation bus bar installs traditional 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, zero-sequence current carrier signal receiver is installed on substation bus bar, arc suppression coil is installed at substation transformer；Traditional 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, for Single-phase Ground Connection Failure positioning.The device can carry out accurate, reliable positioning to trouble point, and the method for use is realized simply, small to electric network influencing.
Description
Technical field
The utility model belongs to power system Earth Fault Detection technical field, more particularly to a kind of power distribution network single-phase earthing
Failure line selection and positioner.
Background technology
In 10kV/35kV power distribution networks, the line is busy the 70%~80% of road total failare for singlephase earth fault, be distribution system most
Common failure.Accurately, it is very necessary route selection and positioning reliably to be carried out to one-phase earthing failure in electric distribution network point.
Position Research at home and abroad to distribution network failure point at present mainly has three kinds of methods：
1., using the Fault Locating Method of outdoor fault detector, the method is by fault message before and after fault inspecting
Different determine fault sections.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 Distribution of Magnetic Field due to zero-sequence current is also relevant with the capacitance profile of power network, therefore the method detection
Precision is not high.
2. measure failure when circuit end points at voltage, electric current, by calculate analysis judge fault distance fault location side
Method.Impedance method is common are, due to the reason such as distribution network line is complicated, line impedance parameter is uneven, impedance method can only be played
Reference role.
3. by system Injection Signal, realizing the injecting signal of fault location.The method increases frequency in circuit head end
Signal source, frequency, phase and wave character according to each branch port transmission function frequency spectrum realize fault location, due to actually matching somebody with somebody
Power network line is more long, 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
Many limitations.
But the localization method of several typical method distribution network failure points, exists and has an impact to power network above, and positioning precision is not
High, inaccurate the problems such as.
Utility model content
The purpose of this utility model is to provide one kind and accurately and reliably one-phase earthing failure in electric distribution network point can be selected
The device of line and positioning.
To achieve the above object, the technical solution adopted in the utility model is：A kind of Single-phase Earth-fault Selection in Distribution Systems
With positioner, including substation bus bar, substation transformer and power distribution network transmission line of electricity, the every of substation bus bar is additionally included in
Bar feeder line leading-out terminal installs traditional zero sequence current mutual inductor, and zero is installed at each transmission line of electricity of power distribution network each area segmentation node
Sequence current carrier signal source, installs zero-sequence current carrier signal receiver on substation bus bar, pacifies at substation transformer
Dress arc suppression coil；Traditional 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 Single-phase Ground Connection Failure
Positioning.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems and positioner, at described each area segmentation node zero
Sequence current carrier signal source selects the modulated signal of different frequency, and frequency range is 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 for standing nearer is higher；The land more remote apart from transformer station
Segmented node zero-sequence current carrier signal source frequency is lower.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems and positioner, the transmission line of electricity area segmentation is several
Determine according to fault location precision and actual requirement.
Implement process as follows：
1st, Single-phase Earth-fault Selection in Distribution Systems；
In each traditional zero sequence current mutual inductor of transmission line outlet end installing of power distribution network, the zero of each transmission line of electricity head end is detected
Sequence electric current, its zero-sequence current power frequency component delivers to transformer station's detection means by zero sequence current mutual inductor secondary circuit, by this
Zero sequence current signal judges the circuit that singlephase earth fault occurs；
2nd, one-phase earthing failure in electric distribution network point location；
(1) each transmission line of electricity of power distribution network, is carried out into area segmentation according to positioning precision and actual requirement, in each region point
Zero-sequence current carrier signal source is installed at Duan Jiedian, the zero-sequence current carrier signal source selection installed at each area segmentation node
Different frequency modulated signal, the tens of kHZ of frequency range to hundreds of kHZ；And the land segmented node nearer apart from transformer station
The frequency of zero-sequence current carrier signal source is higher, the land segmented node zero-sequence current carrier signal more remote apart from transformer station
Source frequency is lower；
(2), by gathering the zero-sequence current of each segmented node, and based on carrier wave principle by the amplitude of the zero-sequence current,
Phase information passes to transformer station's zero-sequence current carrier signal receiver, detects amplitude, the phase of the zero-sequence current of each node
Position information；
(3), by arc suppression coil compensation, zero-sequence current amplitude, phase between trouble point and transformer station can change, and pass through
Amplitude, the phase place change information of the zero-sequence current of each segmented node that analysis transformer station detects, to the single-phase earthing of circuit
Trouble point is positioned.
The beneficial effects of the utility model：Accurate, reliable positioning, the method for use can be carried out to distribution network failure point
Realize simply, it is small to electric network influencing.
Brief description of the drawings
Fig. 1 is two groups of outlet system construction drawings of the utility model one embodiment 10kV/35kV buses；
Fig. 2 is the utility model one embodiment zero-sequence current carrier signal source topology diagram.
Specific embodiment
Implementation method of the present utility model is described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein same or similar label represents identical or class from start to finish
As element or the element with same or like function.Below with reference to Description of Drawings embodiment be it is exemplary, only
For explaining the utility model, and can not be construed to limitation of the present utility model.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model.For
Simplification disclosure of the present utility model, hereinafter part and setting to specific examples be described.They are only merely illustrative, and
And purpose does not lie in limitation the utility model.Additionally, the utility model can in different examples repeat reference numerals and/or word
It is female.This repetition is for purposes of simplicity and clarity, between discussed various embodiments itself not being indicated and/or being set
Relation.Additionally, the utility model provides the example of various specific techniques and material, but those of ordinary skill in the art can
To recognize the use of the applicability and/or other materials of other techniques.In addition, fisrt feature described below is special second
Levy it " on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other spy
The embodiment being formed between the first and second features is levied, such first and second feature may not be directly contact.
In description of the present utility model, it is necessary to explanation, unless otherwise prescribed and limit, term " connected " " connection " answer
It is interpreted broadly, can is direct for example, it may be mechanically connecting or electrical connection, or two connections of element internal
It is connected, it is also possible to be indirectly connected to by intermediary, for the those of ordinary skill in phase field, can be as the case may be
Understand the concrete meaning of above-mentioned term.
The technical scheme that following examples are used：A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner, including become
Power station bus, substation transformer and power distribution network transmission line of electricity, each feed line leading-out terminal for being additionally included in substation bus bar are installed
Traditional 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 receiver on substation bus bar, and arc suppression coil is installed 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 is carried
Ripple signal source gathers the zero sequence current signal of each area segmentation node, for Single-phase Ground Connection Failure positioning.
In above-mentioned Single-phase Earth-fault Selection in Distribution Systems and positioner, at described each area segmentation node zero
Sequence current carrier signal source selects the modulated signal of different frequency, and frequency range is 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 for standing nearer is higher；The land more remote apart from transformer station
Segmented node zero-sequence current carrier signal source frequency is lower.The transmission line of electricity area segmentation number according to fault location precision and
Actual requirement determines.
Embodiment 1
As shown in figure 1, during specific implementation, traditional zero sequence current mutual inductance is installed in each feed line leading-out terminal of substation bus bar
Device, gathers the zero sequence current signal of each loop line road head end, and route selection is carried out to singlephase earth fault.
Because power distribution network transmission line of electricity is more long, carry out area segmentation to each loop line road, 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, the zero-sequence current of regional segmented node is extracted by zero-sequence current carrier signal source, and is saved this based on carrier wave principle
The amplitude of point zero-sequence current, phase information are passed at the zero-sequence current carrier signal receiver of transformer station's installation, can become
Zero-sequence current phase, the amplitude information of each node are collected at power station.Due to by arc suppression coil compensation, trouble point and power transformation
Zero-sequence current amplitude, phase between standing can change, the width of the zero-sequence current by analyzing each node that transformer station collects
Value, phase place change information, it is possible to which the Single-phase Ground Connection Failure to 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 domain is different, frequency band range：Tens of kHZ to hundreds of kHZ, to avoid mixing
Frequency phenomenon, the line node carrier frequency nearer apart from transformer station is higher, the line node carrier frequency more remote apart from transformer station
It is lower.
As shown in Fig. 2 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 received at bus signal receiver.The high-frequency carrier signal contains the width of zero-sequence current
Value, phase information.By sending the PWM high-frequency controling signals of different frequency, zero-sequence current carrier signal source can just be produced not
The carrier signal of same frequency.
The principle of embodiment 1 is illustrated below in conjunction with Fig. 1：
With two groups of outlets of 10kV/35kV buses in Fig. 1, the choosing of power distribution network single-phase earthing is depicted as a example by circuit 1, circuit m
Line and positioning device structure figure.
In the traditional zero sequence current mutual inductor 1 of head end installing of each group power distribution network transmission line of electricity and traditional zero sequence current mutual inductor
M, can respectively detect the zero-sequence current of circuit 1 and circuit m head ends.
Every circuit of power distribution network is divided into n region, a zero-sequence current is installed at each area segmentation node and is carried
Zero-sequence current carrier signal source m-1~m-n on ripple signal source 1-1~1-n, circuit m.These zero-sequence current carrier signal sources can
Zero sequence current signal is switched into high-frequency carrier signal.Length according to each bar circuit is different, can be divided into as needed different
Areal, i.e., the n of each bar circuit can be with difference.
To avoid mixing phenomenon, the zero-sequence current carrier signal at every power distribution network transmission line of electricity different zones segmented node
Source selects the modulated signal of different frequency, its frequency range：Tens of kHZ to hundreds of kHZ, the line node nearer apart from transformer station
Frequency is higher, and the line node frequency more remote apart from transformer station is lower.Each frequency in i.e. to figure has：
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
Received at line receiver, so as to extract the phase of each node, amplitude information.
Arc suppression coil is installed at substation transformer, by adjusting arc suppression coil, can compensate trouble point to bus it
Between circuit zero-sequence current so that bus to the zero-sequence current amplitude between trouble point, phase information can change, be based on
This, amplitude, the phase place change information of the zero sequence current signal of each node that can be extracted by analysis are determined trouble point
Position.
Embodiment 2
Assuming that by circuit 1 point be 7 area segmentations, 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 adjusting arc suppression coil compensation, trouble point and
Zero-sequence current amplitude, phase between bus can change, i.e., traditional 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
Change.
The zero-sequence current information detected by traditional 1~m of zero sequence current mutual inductor, it can be determined that singlephase earth fault is sent out
Life is in circuit 1.
The high-frequency carrier signal extracted by isolated-phase buses signal receiver, it can be found that frequency f7~f440kHZ~
High-frequency carrier signal amplitude between 70kHZ, phase are not changed in；More than 50kHZ, (i.e. frequency is more than f to frequency3) high frequency carry
Ripple signal amplitude, phase 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 is not elaborated belongs to prior art.
Although specific embodiment of the present utility model, those of ordinary skill in the art above in association with Description of Drawings
It should be appreciated that these are merely illustrative of, various deformation or modification can be made to these implementation methods, without departing from this practicality
New principle and essence.Scope of the present utility model is only limited by the claims that follow.
Claims (2)
1. a kind of Single-phase Earth-fault Selection in Distribution Systems and 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 for being additionally included in substation bus bar installs traditional zero sequence current mutual inductance
Device, installs zero-sequence current carrier signal source, on substation bus bar at each transmission line of electricity of power distribution network each area segmentation node
Zero-sequence current carrier signal receiver is installed, arc suppression coil is installed at substation transformer；Traditional 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, for Single-phase Ground Connection Failure positioning.
2. Single-phase Earth-fault Selection in Distribution Systems as claimed in claim 1 and positioner, it is characterised in that described each area
Zero-sequence current carrier signal source at the segmented node of domain selects the modulated signal of different frequency, and frequency range is tens of kHZ to number
Hundred kHZ, and the frequency of the land segmented node zero-sequence current carrier signal source nearer apart from transformer station is higher；Apart from power transformation
The land segmented node zero-sequence current carrier signal source frequency for standing more remote is lower.
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| CN201621091884.7U CN206235696U (en) | 2016-09-29 | 2016-09-29 | A kind of Single-phase Earth-fault Selection in Distribution Systems and positioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221115A (en) * | 2019-07-10 | 2019-09-10 | 山东钢铁股份有限公司 | The determination method, apparatus and equipment of unbalanced earth fault capacitance current |
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2016
- 2016-09-29 CN CN201621091884.7U patent/CN206235696U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110221115A (en) * | 2019-07-10 | 2019-09-10 | 山东钢铁股份有限公司 | The determination method, apparatus and equipment of unbalanced earth fault capacitance current |
| CN110221115B (en) * | 2019-07-10 | 2021-07-02 | 山东钢铁股份有限公司 | Method, device and equipment for determining single-phase grounding capacitance current |
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