CN106324432A - Single-phase grounding line selection method for small-current grounding system - Google Patents
Single-phase grounding line selection method for small-current grounding system Download PDFInfo
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- CN106324432A CN106324432A CN201610777806.0A CN201610777806A CN106324432A CN 106324432 A CN106324432 A CN 106324432A CN 201610777806 A CN201610777806 A CN 201610777806A CN 106324432 A CN106324432 A CN 106324432A
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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
Abstract
The invention discloses a single-phase grounding line selection method for a small-current grounding system, and the method comprises the following steps: 1, collecting the zero sequence voltage of a bus or an outgoing line and the zero sequence current of the outgoing line, and calculating the amplitude of the zero sequence voltage in real time; 2, determining that the bus or the outgoing line has a single-phase grounding fault when the amplitude of the zero sequence voltage is greater than the amplitude of a line selection start voltage, and switching to step 3; 3, extracting the data of zero sequence current and voltage of a cycle before a moment when a fault happens and a cycle after the moment of the fault happens, and carrying out the wavelet packet transformation of the data of transient zero sequence voltage and current; 4, comparing the phases of the transient zero sequence current and voltage after the wavelet packet transformation: determining that a line is not a fault line if the phases are the same, and determining that the line is a fault line if the phases are opposite, thereby completing the grounding line section. The method solves a problem of a higher line selection misjudgment rate caused by that the phases and amplitudes of the zero sequence currents of the fault line and the non-fault line when a conventional arc suppression coil grounding system has a single-phase grounding fault.
Description
Technical field
A kind of method that the present invention relates to small current grounding system single-phase grounding selecting.
Background technology
In China 3kV～66kV supply and distribution net, major part all uses neutral point not direct grounding way, because it connects
During earth fault, the electric current flowing through earth point is little, so being commonly referred to as small current neutral grounding system (NUGS), it includes that neutral point does not connects
Ground system (NUS), neutral by arc extinction coil grounding system (NES, also referred to as resonant earthed system) and Neutral Grounding through Resistance in Electrical
System (NRS).In recent years, along with being widely used from motion tracking arc, for solving what system occurred at instant of failure
Resonance problems, begins with arc suppression coil and nonlinear resistance string (or also) connection and the method for operation in parallel with spark gap.
The probability of small current neutral grounding system generation singlephase earth fault is the highest.But, when system generation singlephase earth fault
Time, owing to not constituting short-circuit loop, earth-fault current is more much smaller than load current, particularly neutral by arc extinction coil grounding
System earth electric current is the least, and three-phase line voltage remains in that symmetrical relations, does not affect power supply continuous to load, therefore need not jump immediately
Lock, code regulation can continue to run with l～2h.But, due to the appearance of earth point, the now electricity over the ground of healthy phases in system
Pressure rises to 1.732 times of primary voltage, and the insulation to electrical network forms threat, it is easy to induces another point in the weak place of electrical network and connects
Ground, thus form phase fault.Along with the increase of power system capacity, the increase of total line length, capacitance current is increasing, arc light
The overvoltage multiple that ground connection causes is the highest.
To this end, scientific worker both domestic and external is in succession at aspects such as the mode of connection, over-voltage measure and ground protections
Studied, thirsted for reducing to greatest extent the probability that singlephase earth fault occurs, and, once there occurs single-phase connecing
Earth fault, it is also desirable to faulty line can be selected as early as possible to fix a breakdown in time.And compensated distribution network occurs single-phase
During earth fault, due to faulty line and the zero-sequence current of non-fault line phase and amplitude the most relatively, thus cause
The problem that route selection False Rate is higher.
Summary of the invention
For the problems referred to above, the present invention provides a kind of method of small current grounding system single-phase grounding selecting, solves at present
Due to the phase place of faulty line Yu the zero-sequence current of non-fault line during compensated distribution network generation singlephase earth fault
With amplitude the most relatively, the problem that the route selection False Rate that causes is higher.
For realizing above-mentioned technical purpose, reaching above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of method of small current grounding system single-phase grounding selecting, it is characterised in that comprise the steps:
Step 1, collection bus or the residual voltage of outlet, the zero-sequence current of outlet, calculate residual voltage amplitude in real time；
Step 2, think bus or outlet generation singlephase earth fault when residual voltage amplitude starts voltage more than route selection,
Enter step 3；
Step 3, intercept when fault occurs before and after the zero-sequence current of each cycle and the data of residual voltage, and to transient state
Residual voltage and transient zero-sequence current data carry out wavelet package transforms；
Step 4, compare transient zero-sequence current and the phase place of transient zero-sequence voltage after wavelet package transforms, if phase place is identical, be
Non-fault line, if opposite in phase, is faulty line, thus completes earthing wire-selecting.
Preferably, wavelet package transforms used strict support orthogonal wavelet base DB10 small echo.
Preferably, small current neutral grounding system is 3kV-66kV small current neutral grounding system.
The invention has the beneficial effects as follows:
(1) transient zero-sequence voltage and transient zero-sequence current only with this circuit judge whether earth fault, it is not necessary to
The zero-sequence current data of All other routes, therefore this method may be used for centralized earth protective device, it is also possible to for separate room
Every protection device in.
(2) earth fault transient process and electric network composition, parameter, the method for operation are relevant.Transient current is much larger than stable state electricity
Capacitance current, transient state maximum current value phase angle initial with false voltage is relevant, and transient current is not affected by arc suppression coil, and arc light connects
Ground and intermittent ground connection transient state component are more rich, solve to utilize the inaccurate problem of steady-state current route selection.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for a kind of small current grounding system single-phase grounding selecting of the present invention；
Fig. 2 is the wiring schematic diagram that the present invention realizes in line-selected earthing device；
Fig. 3 is the wiring schematic diagram that the present invention realizes in feeder protection equipment.
Detailed description of the invention
With specific embodiment, technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings, so that ability
The technical staff in territory can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
Fixed.
A kind of method of small current grounding system single-phase grounding selecting, as it is shown in figure 1, comprise the steps:
Step 1, collection bus or the residual voltage of outlet, the zero-sequence current of outlet, calculate residual voltage amplitude in real time.
Step 2, think bus or outlet generation singlephase earth fault when residual voltage amplitude starts voltage more than route selection,
Enter step 3.
Step 3, intercept when fault occurs before and after the zero-sequence current of each cycle and the data of residual voltage, and to transient state
Residual voltage and transient zero-sequence current data carry out wavelet package transforms.
In order to match with signal characteristic, the resolution of wavelet transformation on time-frequency plane, be not to immobilize but with
Frequency change, i.e. frequency resolution reduces with the rising of frequency, and this adaptivity of wavelet transformation causes little just
During wave conversion-new problem of frequency analysis, that is, so-called " high-frequency and low-resolution rate " problem.And developed by wavelet transformation and
Wavelet packet (wavelet packet) technology come, compensate for this deficiency, such that it is able to according to characteristics of signals and analysis requirement
Resolution is arbitrarily selected in certain frequency domain.
Quick and precisely select fault branch it is critical that utilize Wavelet Packet Technique collect exactly zero-sequence current, zero
The jump signal that the transient state of sequence voltage is faint, analyzes its feature being clearly distinguishable from non-faulting branch road.Wavelet packet in the present invention
Convert used strict support orthogonal wavelet base DB10 small echo, namely DB small echo during L=10, i.e. 10 rank DB small echos.
Step 4, compare transient zero-sequence current and the phase place of transient zero-sequence voltage after wavelet package transforms, if phase place is identical, be
Non-fault line, if opposite in phase, is faulty line, thus completes earthing wire-selecting.
Wherein, small current neutral grounding system is 3kV-66kV small current neutral grounding system, can be applicable to isolated neutral and warp
In the system of grounding through arc.As a example by Fig. 2, using a line-selected earthing device to realize route selection function, line selection apparatus passes through
Cable completes the collection of bus residual voltage, the collection of each feeder line branch road zero-sequence current, and then completes earthing wire-selecting.With Fig. 3 it is
Example, use by route selection function embed feeder protection equipment method, protection device by cable complete to bus residual voltage with
The collection of feeder line zero-sequence current, completes earthing wire-selecting.
The invention has the beneficial effects as follows:
(1) transient zero-sequence voltage and transient zero-sequence current only with this circuit judge whether earth fault, it is not necessary to
The zero-sequence current data of All other routes, therefore this method may be used for centralized earth protective device, it is also possible to for separate room
Every protection device in.
(2) earth fault transient process and electric network composition, parameter, the method for operation are relevant.Transient current is much larger than stable state electricity
Capacitance current, transient state maximum current value phase angle initial with false voltage is relevant, and transient current is not affected by arc suppression coil, and arc light connects
Ground and intermittent ground connection transient state component are more rich, solve to utilize the inaccurate problem of steady-state current route selection.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description and accompanying drawing content are made convert, or it is relevant to be directly or indirectly used in other
Technical field, be the most in like manner included in the scope of patent protection of the present invention.
Claims (3)
1. the method for a small current grounding system single-phase grounding selecting, it is characterised in that comprise the steps:
Step 1, collection bus or the residual voltage of outlet, the zero-sequence current of outlet, calculate residual voltage amplitude in real time；
Step 2, think bus or outlet generation singlephase earth fault when residual voltage amplitude starts voltage more than route selection, enter
Step 3；
Step 3, intercept when fault occurs before and after the zero-sequence current of each cycle and the data of residual voltage, and to transient zero-sequence
Voltage and transient zero-sequence current data carry out wavelet package transforms；
Step 4, compare the phase place of transient zero-sequence current and transient zero-sequence voltage after wavelet package transforms, if phase place is identical, be non-former
Barrier circuit, if opposite in phase, is faulty line, thus completes earthing wire-selecting.
The method of a kind of small current grounding system single-phase grounding selecting the most according to claim 1, it is characterised in that small echo
Packet transform used strict support orthogonal wavelet base DB10 small echo.
The method of a kind of small current grounding system single-phase grounding selecting the most according to claim 1, it is characterised in that little electricity
Stream earthed system is 3kV-66kV small current neutral grounding system.
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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 |
| CN107402340A (en) * | 2017-07-28 | 2017-11-28 | 南京南瑞继保电气有限公司 | A kind of single-phase grounded malfunction in grounded system of low current method of discrimination based on energy model |
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN108562820A (en) * | 2018-05-04 | 2018-09-21 | 国网甘肃省电力公司电力科学研究院 | Single-phase ground fault line selecting method of small-electric current grounding system and device |
| CN108693439A (en) * | 2017-04-07 | 2018-10-23 | 南京南瑞继保电气有限公司 | A kind of small current neutral grounding system multi-line is the same as phase single-phase grounding selecting method |
| CN108776284A (en) * | 2018-03-29 | 2018-11-09 | 广东电网有限责任公司惠州供电局 | A kind of small resistance grounding system single phase earthing protection method compared based on zero-sequence current |
| 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 |
| CN109061378A (en) * | 2018-06-09 | 2018-12-21 | 广西电网有限责任公司电力科学研究院 | Small current neutral grounding system ground fault checks method |
| CN109103852A (en) * | 2018-03-19 | 2018-12-28 | 中国石油大学(华东) | A kind of small resistance grounding system single phase earthing protection new method compared based on zero-sequence current |
| CN109283421A (en) * | 2018-10-16 | 2019-01-29 | 中铁电气化（武汉）设计研究院有限公司 | A kind of rail traction substation low-voltage is powered detection test method and device |
| CN109765459A (en) * | 2019-01-22 | 2019-05-17 | 清大智能（北京）科技有限公司 | It is a kind of based on the method for locating single-phase ground fault studied and judged on the spot and system |
| CN110221178A (en) * | 2019-06-28 | 2019-09-10 | 国网四川省电力公司电力科学研究院 | The fault wire selection method and device of single-phase grounded malfunction in grounded system of low current |
| CN110488155A (en) * | 2019-08-30 | 2019-11-22 | 东南大学 | A kind of fault line selection method for single-phase-to-ground fault applied to flexible ground system |
| CN110632463A (en) * | 2019-10-30 | 2019-12-31 | 中国南方电网有限责任公司 | Small current grounding system fault line selection method based on wavelet analysis |
| CN110988606A (en) * | 2020-01-02 | 2020-04-10 | 河南理工大学 | Sharpening processing-based small current ground fault line selection method |
| CN111077413A (en) * | 2020-01-21 | 2020-04-28 | 山东大学 | Three-phase transient current-based small current grounding system fault phase selection and line selection method |
| CN111830365A (en) * | 2020-06-20 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Multi-transient statistical fault positioning method applied to power grid fault diagnosis |
| CN112240965A (en) * | 2019-07-17 | 2021-01-19 | 南京南瑞继保工程技术有限公司 | Grounding line selection device and method based on deep learning algorithm |
| CN112630686A (en) * | 2020-12-31 | 2021-04-09 | 南京铁道职业技术学院 | Method and system for identifying single-phase earth fault line of urban rail medium-voltage system |
| CN112649694A (en) * | 2019-10-12 | 2021-04-13 | 南京南瑞继保电气有限公司 | Method for judging single-phase earth fault of small-current grounding system |
| CN114062970A (en) * | 2021-12-09 | 2022-02-18 | 安徽三联学院 | Low-current ground fault line selection method and device based on secondary power transformation system |
| CN115144696A (en) * | 2022-06-29 | 2022-10-04 | 国网北京市电力公司 | Fault line selection method, device, equipment and medium for low-current grounding system |
| CN116243208A (en) * | 2023-02-03 | 2023-06-09 | 珠海欧力配网自动化股份有限公司 | Distributed small-current line selection method based on goose communication |
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| CN110488155A (en) * | 2019-08-30 | 2019-11-22 | 东南大学 | A kind of fault line selection method for single-phase-to-ground fault applied to flexible ground system |
| CN112649694B (en) * | 2019-10-12 | 2023-11-17 | 南京南瑞继保电气有限公司 | Method for judging single-phase grounding fault of low-current grounding system |
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| CN110632463A (en) * | 2019-10-30 | 2019-12-31 | 中国南方电网有限责任公司 | Small current grounding system fault line selection method based on wavelet analysis |
| CN110988606B (en) * | 2020-01-02 | 2022-02-11 | 河南理工大学 | Sharpening processing-based small current ground fault line selection method |
| CN110988606A (en) * | 2020-01-02 | 2020-04-10 | 河南理工大学 | Sharpening processing-based small current ground fault line selection method |
| CN111077413A (en) * | 2020-01-21 | 2020-04-28 | 山东大学 | Three-phase transient current-based small current grounding system fault phase selection and line selection method |
| CN111830365A (en) * | 2020-06-20 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Multi-transient statistical fault positioning method applied to power grid fault diagnosis |
| CN112630686A (en) * | 2020-12-31 | 2021-04-09 | 南京铁道职业技术学院 | Method and system for identifying single-phase earth fault line of urban rail medium-voltage system |
| CN114062970A (en) * | 2021-12-09 | 2022-02-18 | 安徽三联学院 | Low-current ground fault line selection method and device based on secondary power transformation system |
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| CN115144696B (en) * | 2022-06-29 | 2023-09-29 | 国网北京市电力公司 | Fault line selection method, device, equipment and medium for low-current grounding system |
| CN116243208A (en) * | 2023-02-03 | 2023-06-09 | 珠海欧力配网自动化股份有限公司 | Distributed small-current line selection method based on goose communication |
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Application publication date: 20170111 |