CN107677920A - A kind of earth-fault indicator system for considering different line parameter circuit values - Google Patents
A kind of earth-fault indicator system for considering different line parameter circuit values Download PDFInfo
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- CN107677920A CN107677920A CN201710834339.5A CN201710834339A CN107677920A CN 107677920 A CN107677920 A CN 107677920A CN 201710834339 A CN201710834339 A CN 201710834339A CN 107677920 A CN107677920 A CN 107677920A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
A kind of earth-fault indicator system for considering different line parameter circuit values, belongs to power failure detection technique field.Including fault detector, data concentrator and main website.Cooperation between fault detector and main website.Judged using transient high-frequency component and DC component.Deterministic process was handled first group of fault detector data of every outlet before this, and high-frequency energy is improved by correction formula, to reduce the influence of different line parameter circuit values, then chose larger in high-frequency energy and DC energy after improving one to carry out route selection.After route selection, the corresponding energy information of every group of fault detector of faulty line is obtained using identical step, can determine that failure occurs between two groups of fault detectors when front and rear two groups of fault detector energy informations meet and required.Advantage is, reduces data processing amount, and suitable for the system that a variety of neutral grounding modes coexist, still possess compared with high-accuracy in the system that circuit difference in length is larger and line parameter circuit value differs greatly.
Description
Technical field
The invention belongs to power failure detection technique field, particularly considers connecing for different line parameter circuit values more particularly to a kind of
Earth fault indicator system.
Background technology
During Operation of Electric Systems, failure occurs often；Wherein, the number accounting that singlephase earth fault occurs exceedes
80%.Fault curre and system neutral earthing mode have very big relation after generation singlephase earth fault；And China is low
It is press-fitted the method for operation that power network mainly uses small current neutral grounding.When singlephase earth fault occurs for small current neutral grounding system, flow through
The electric current of earth point is only line mutual-ground capacitor electric current, and its value is much smaller than load current, therefore can be brought to fault detect a lot
It is difficult.So singlephase earth fault is most easily to occur but to be most difficult to detection.Although according to relevant regulations, small current neutral grounding system
Generation singlephase earth fault successor can continue to run with 1-2 hours；But abort situation need to be found out as early as possible in the successor that breaks down.
In recent years, the device much for fault line selection and fault locating also occurs in succession, is done for the reliability service of power system
Many contributions are gone out；Wherein, the fault detector being configured in overhead transmission line and cable run is exactly one type.Indicating fault
After device proposes, people are also updating its fault detection method while to its HardwareUpgring.But without a kind of failure
Indicator can be suitably used for the operating mode of numerous power systems.
Therefore, it is necessary to propose a kind of failure suitable for various working to give full play to the function of fault detector
Indicator.Realize to appoint in the case where not knowing neutral grounding mode and possess higher accuracy rate.
The content of the invention
It is an object of the invention to provide a kind of earth-fault indicator system for considering different line parameter circuit values, solve
Problem is stated, using circuit DC component and improves high fdrequency component the malfunction indicator system that is judged.
The present invention includes fault detector, data concentrator and main website.
Short-distance wireless communication technology is used between fault detector and data concentrator, data concentrator receives multiple events
Main website is uniformly sent to after hindering the signal of indicator；Communications cost can so be reduced.Such a present application of communication mode is very wide
General, each equipment realizes a kind of method of communication merely just between introducing system, is not intended as the protection content of the present invention.And main website
It is then the processing maincenter of the system.Cooperation of the special place of the invention between fault detector and main website.Therefore, below will
It is discussed in detail.
1) fault detector includes power module, signal detection module, memory module, communication module, control module and event
Hinder indicating module.Its annexation is as follows：Power module is connected with other modules, with provide the operating voltage of each module and
Electric current；Signal detection module is connected with power module, memory module, control module；Memory module and power module, signal detection
Module, control module are connected；Control module and power module, signal detection module, memory module, communication module, indicating fault
Module is connected；Communication module is connected with power module, control module；Failure indication module is connected with power module, control module.
Power module is powered for whole fault detector, and it can be from overhead transmission line or cable run power taking, to ensure
The lasting reliability service of fault detector.
The effect of signal detection module is exactly to gather the electric current and voltage-to-ground on circuit, and transfers data to storage mould
Block is stored.
Memory module is to store the place of line current and voltage-to-ground, and it can be required special time period according to instruction
Information transmission to corresponding module.
Communication module is responsible for being communicated with other equipment, can transmit and receive information and instruction.
Control module is the core of fault detector, is responsible for judging whether that earth fault, and coordinate fault indicator occurs
The work of each intermodule.
Failure indication module is the mould that can show failure on the spot after determining that the fault detector position is broken down
Block, can board turning or luminous.
2) main website is the core of the system, is responsible for data and fault verification that each fault detector of processing is sent, can be to event
Barrier indicator sends control instruction, and the positional information of the position of fault is sent to maintenance personal.And on the screen of main website, can
With intuitively out of order section.
The basic thought of the present invention is judged using transient high-frequency component and DC component.Deterministic process is before this to every
First group of fault detector data of bar outlet are handled, and high-frequency energy are improved by correction formula, to reduce different circuits
The influence of parameter, larger in high-frequency energy and DC energy after improving one is then chosen to carry out route selection.After route selection,
The corresponding energy information of every group of fault detector of faulty line is obtained using identical step, when front and rear two groups of fault detector energy
Amount information meets to can determine that failure occurs between two groups of fault detectors when requiring.
It is an advantage of the current invention that data processing amount is reduced, and coexisted suitable for a variety of neutral grounding modes
System, it is not necessary to know the mode of system neutral ground connection；Its applicable working condition is more, when considering transformer error, is grown in circuit
Spend to appoint in the system for differing greatly and differing greatly with line parameter circuit value and so possess compared with high-accuracy.
Brief description of the drawings
Fig. 1 is the structured flowchart of fault detector of the present invention.
Fig. 2 is the workflow diagram of fault detector.
Fig. 3 is the workflow diagram of fault detector main website.
Fig. 4 is that failure initial phase angle is 30 °, and earth point resistance value is high-frequency energy spirogram before 30 Ω are improved.
Fig. 5 is that failure initial phase angle is 30 °, and earth point resistance value is high-frequency energy spirogram after 30 Ω are improved.
Fig. 6 is that failure initial phase angle is 40 °, and earth point resistance value is high-frequency energy spirogram before 30 Ω are improved.
Fig. 7 is that failure initial phase angle is 40 °, and earth point resistance value is high-frequency energy spirogram after 30 Ω are improved.
Embodiment
The present invention includes fault detector, data concentrator and main website.
Short-distance wireless communication technology is used between fault detector and data concentrator, data concentrator receives multiple events
Main website is uniformly sent to after hindering the signal of indicator；Communications cost can so be reduced.Such a present application of communication mode is very wide
General, each equipment realizes a kind of method of communication merely just between introducing system, is not intended as the protection content of the present invention.And main website
It is then the processing maincenter of the system.Cooperation of the special place of the invention between fault detector and main website.
Below in conjunction with the accompanying drawings to the present invention operation principle further illustrate, fault detector be installed in overhead transmission line or
Enter working condition after person's cable run.
Fault detector starts to sample line current and voltage after working condition is entered, the electric current after sampling
Data are directly stored in memory module, and voltage data is then input to control module while memory module is stored in and carries out a letter
Single judgement.
1) judge current voltage value in half period whether the predeterminated voltage continuously less than 0.5 times, if less than 0.5 times
Predeterminated voltage, then judge earth fault mutually occurs where the fault detector.
If 2) current voltage continues the predeterminated voltage that half period is both greater than 1.5 times, earth fault occurs for decision-making system,
It is mutually non-faulting phase where the fault detector.I.e. when system jam, all fault detectors are all by decision-making system
Break down.
3) after decision-making system breaks down, controller will send command adapted thereto.Voltage is started down or up that time
The current data of corresponding a cycle extracts from memory afterwards.
4) failure extracted to that the current data in the latter cycle occur and input communication module, be ultimately delivered to master
Stand.
5) after main website receives the data that each fault detector transmission comes, the circuit installed according to it is grouped and deposited
Storage.
6) according to the above, the zero-sequence current that first group of fault detector transmission of every outlet comes is obtained.That is basis
Every outlet one group fault detector data nearest from transformer station obtain the zero-sequence current of the circuit.
7) FFT is asked to the zero-sequence current of every outlet.The ENERGY E of 300-3000Hz in circuit i frequency spectrum is obtained againhi0With
It is less than 20Hz ENERGY E in circuitdi。Ehi0And EdiIt is referred to as high-frequency energy and DC energy.
8) according to the length l of every outletiTo high-frequency energy Ehi0It is improved, the high-frequency energy after improvement is Ehi, improve
Formula is as follows：
Wherein, n is outlet sum,For the total length of all outlets, liFor circuit i length, CnFor circuit n's
Direct-to-ground capacitance value.
9) two value E that high-frequency energy is maximum after being improved in each outlet are chosenhmiAnd Ehmj, seek the poor Δ E of the twohm, i.e.,：
ΔEhm=| Ehmi-hmj|
10) two value E that DC energy is maximum in each outlet are chosendmiAnd Edmj, seek the poor Δ E of the twodm, i.e.,：
ΔEdm=| Edmi-dmj|
11) Δ E is comparedhmWith Δ EdmSize.
If 12) Δ EhmThan Δ EdmGreatly, then ensuing judgement is carried out using high-frequency energy.Maximum height in i.e. each outlet
Frequency ENERGY EhmiCorresponding circuit i is faulty line.Failure line selection is completed, is fault location in next step：
1. obtaining the zero-sequence current at each group of fault detector in circuit i, each group of high-frequency energy is similarly obtained
Ehip。
K group fault detectors are shared in i outlets 2. setting, high-frequency energy corresponding to each group is Ehip, p=1,2 ... k.
3. every group of high-frequency energy on i circuits is compared, when two groups of adjacent fault detector z and x high-frequency energy
Than less than 0.7, then judging trouble point between z groups fault detector and x group fault detectors.High-frequency energy ratio is：
If 13) Δ EhmThan Δ EdmIt is small, then carry out ensuing judgement using DC energy.It is maximum straight in i.e. each outlet
Stream energy EdmiCorresponding circuit i is faulty line.Failure line selection is completed, is fault location in next step：
1. obtaining the zero-sequence current at each group of fault detector in circuit i, each group of DC energy is similarly obtained
Edip。
K group fault detectors are shared in i outlets 2. setting, DC energy corresponding to each group is Edip, p=1,2 ... k.
3. every group of DC energy on i circuits is compared, when two groups of adjacent fault detector z and x DC energy
Than less than 0.7, then judging trouble point between z groups fault detector and x group fault detectors.DC energy ratio is：
14) finally, fault section will be shown on main website screen.And fault location information can be sent to maintenance personal
On mobile phone, to find out abort situation as early as possible.
Such a method can be detected by emulation, have four outlets in simulation model altogether, circuit one is fault wire
Road.Fig. 4 and Fig. 5 is that high-frequency energy improves front and rear contrast, it can be seen that the discrimination of high-frequency energy strengthens between circuit after improvement,
It is easy to failure line selection.
Below, it is compared to improving front and rear method, table 1, table 2 are the data judged using high-frequency energy method；
Table 3, table 4 are using set forth herein the result of method.
Route selection result of the high-frequency energy method of table 1 in isolated neutral system
Route selection result of the high-frequency energy method of table 2 in compensated distribution network
Route selection result of the context of methods of table 3 in isolated neutral system
Route selection result of the context of methods of table 4 in compensated distribution network
Proved by emulating, very high accuracy rate is possessed using the malfunction indicator system of such a comprehensive criterion, is not being known
Accuracy rate is nor affected in the case of road neutral grounding mode；Influence of the failure initial phase angle to fault detect is reduced a lot,
And also there is very high discrimination when non-fault line direct-to-ground capacitance value is larger, it is therefore prevented that the generation of erroneous judgement；It is applied to line
The larger system to be differed greatly with line parameter circuit value of road difference in length.
Claims (1)
1. a kind of earth-fault indicator system for considering different line parameter circuit values, including：Fault detector, data concentrator and master
Stand；Characterized in that,
Short-distance wireless communication is used between fault detector and data concentrator, data concentrator receives multiple fault detectors
Signal after be uniformly sent to main website；To reduce communications cost；Main website is then the processing maincenter of the system；Fault detector and master
Cooperation between standing；
Fault detector includes power module, signal detection module, memory module, communication module, control module and indicating fault
Module；Power module is connected with other modules, to provide the operating voltage of each module and electric current；Signal detection module and electricity
Source module, memory module, control module are connected；Memory module is connected with power module, signal detection module, control module；Control
Molding block is connected with power module, signal detection module, memory module, communication module, failure indication module；Communication module and electricity
Source module, control module are connected；Failure indication module is connected with power module, control module；
Power module is powered for whole fault detector, from overhead transmission line or cable run power taking, to ensure fault detector
Lasting reliability service；
The effect of signal detection module is exactly to gather the electric current and voltage-to-ground on circuit, and transfers data to memory module and enter
Row storage；
Memory module is to store the place of line current and voltage-to-ground, and it requires to pass the information of special time period according to instruction
It is sent to corresponding module；
Communication module is responsible for being communicated with other equipment, transmission and receive information and instruction；
Control module is the core of fault detector, is responsible for judging whether that earth fault, and each mould of coordinate fault indicator occurs
Work between block；
Failure indication module is the module that can show failure on the spot after determining that the fault detector position is broken down,
Board turning is luminous；
Main website is the core of the system, is responsible for data and fault verification that each fault detector of processing is sent, to fault detector
Control instruction is sent, and the positional information of the position of fault is sent to maintenance personal；On the screen of main website, intuitively it is out of order
Section；
Fault detector, record and preserve track data, decision-making system breaks down when demanded；Fault message is passed through
Data concentrator is sent to main website processing；
Main website, it is the center of data processing, is judged using transient high-frequency component and DC component；Deterministic process is before this to every
First group of fault detector data of bar outlet are handled, and high-frequency energy are improved by correction formula, to reduce different circuits
The influence of parameter, larger in high-frequency energy and DC energy after improving one is then chosen to carry out route selection；After route selection,
The corresponding energy information of every group of fault detector of faulty line is obtained using identical step, when front and rear two groups of fault detector energy
Judge that failure occurs between two groups of fault detectors when amount information meets to require.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710834339.5A CN107677920B (en) | 2017-09-15 | 2017-09-15 | Ground fault indicator system considering different line parameters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710834339.5A CN107677920B (en) | 2017-09-15 | 2017-09-15 | Ground fault indicator system considering different line parameters |
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| CN107677920A true CN107677920A (en) | 2018-02-09 |
| CN107677920B CN107677920B (en) | 2020-05-15 |
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| CN201710834339.5A Active CN107677920B (en) | 2017-09-15 | 2017-09-15 | Ground fault indicator system considering different line parameters |
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Cited By (1)
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| CN108732467A (en) * | 2018-08-09 | 2018-11-02 | 安徽亚辉电气自动化有限公司 | A kind of one-phase earthing failure in electric distribution network detection positioning system |
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