CN107340416A - A kind of distribution network failure indicator LC tunings are outer to apply signal source - Google Patents
A kind of distribution network failure indicator LC tunings are outer to apply signal source Download PDFInfo
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- CN107340416A CN107340416A CN201710747518.5A CN201710747518A CN107340416A CN 107340416 A CN107340416 A CN 107340416A CN 201710747518 A CN201710747518 A CN 201710747518A CN 107340416 A CN107340416 A CN 107340416A
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- switch
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- shunt
- distribution network
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/38—Arrangements for altering the indicating characteristic, e.g. by modifying the air gap
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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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
A kind of distribution network failure indicator LC tunings are outer to apply signal source, including control system, shunt capacitor group（C）, shunt reactor group（L）, series limiting resistor（R）, shunt capacitor switch（SC）, shunt reactor switch（SL）Switched with signal sequence（S1）.When it is outer apply signal source and detect earth current after, signal sequence switch starts switching according to certain frequency, produces the low and high level of certain sequence；When a failure occurs it, switched by shunt capacitor switch and shunt reactor, shunt capacitor capacitance, the reactor induction reactance value in regulation external signal source, make outer to apply signal impedance and short circuit current is limited to certain limit.
Description
Technical field
The present invention relates to signal source is applied outside a kind of distribution network failure indicator LC tunings, belong to power matching network technical field.
Background technology
Distribution network systems erection scope is relatively wide, construction is also relative complex, and mixes layout, actual motion with all kinds of cable runs
In be likely to occur various failure problems, want to safeguard the safety of distribution, continuous running, must just grasp Distribution Network Failure fast positioning
Technology and method, while introduce fault detector, position in time and release failure, avoid failure from causing safety to distribution network systems
Threaten, support and safeguard the safe efficient operation of distribution with this.Indicator is responsible for collected current, information of voltage, so as to position
And failure is indicated, and it is responsible for the related fault message of output.Actual voltage acquisition process is：Rely on space electric field current potential ladder
Degree carries out voltage acquisition, and electromagnetic induction carrys out collected current, and failure is graduated from old-type opera school by the changing rule etc. of analysis voltage, electric current
Judgement and identification.When finding short trouble, then action is actively sent, while do lower mark, corresponding fault-signal is then
It can be transmitted by communication system to main website.But because equipment manufacturer's product quality is uneven, fault detector is caused to list
The accuracy rate of phase Earth Fault Detection is not overall high, traces it to its cause and is transplanted to distribution network line mainly due to conventional detection principle
There is certain limitation afterwards, therefore by carrying out com-parison and analysis to a variety of conventional criterions in industry, obtain and apply signal inspection out
Survey earth fault accuracy rate highest conclusion.
Apply signal fault indicator outside power distribution network to form including two parts, apply signal generating source, fault detector outside, when
When detecting earth current, the characteristic sequence that signal generating source produces a certain frequency by switching, matching failure are applied outside
Pointer detection is to board turning after this feature sequence and glistens, and fault message uploads main website, and the circuit is not detected by the event of failure
Hinder indicator and keep normal operating condition, so as to can intuitively observe distribution line failure area by the state of fault detector
Between, it is easy to operation maintenance personnel to reduce line walking distance.
The content of the invention
The object of the present invention is in order to solve the problems, such as that fault detector exists in use, the present invention proposes that one kind is matched somebody with somebody
Electric network fault indicator LC tunings are outer to apply signal source, combination failure indicator, improves detection of the fault detector to Distribution Network Failure
Rate.
Realize that technical scheme is as follows：A kind of distribution network failure indicator LC tunings are outer to apply signal source, including control
System processed, shunt capacitor group, shunt reactor group, series limiting resistor, shunt capacitor switch, shunt reactor switch and
Signal sequence switchs.
The shunt capacitor group series and parallel capacitor switch, shunt reactor group series and parallel reactor switch, and
It is associated on signal sequence switch；The other end of shunt capacitor group is with being connected series connection limit after the other end parallel connection of shunt reactor group
It is grounded after leakage resistance；Signal sequence switch input terminal connects power distribution network three-phase.
When it is outer apply signal source and detect earth current after, signal sequence switch starts switching according to certain frequency, produces one
The low and high level of sequencing row；When a failure occurs it, switched by shunt capacitor switch and shunt reactor, adjust external signal
Shunt capacitor capacitance, the reactor induction reactance value in source, make to apply signal impedance outside and earth current is limited to certain limit.
The control system includes collecting unit, computing unit, alarm and radio-cell and output control unit.
The collecting unit input connects power distribution network transformer, and output end connects the input of computing unit；Calculate single
The output end connection alarm of member and radio-cell；Another output end connection output control unit of computing unit；Output
The output end of control unit connects each signal sequence switch.
The sample frequency 10KHZ of the collecting unit, gather A, B, C three-phase current；Control unit controlling switch is cut-off,
And the status information of examinations switch.
The monophase current of collection is synthesized zero-sequence current by the computing unit, and zero-sequence current composite formula is i0=ia+ib
+ic, wherein i0For zero-sequence current, iaFor A phase currents, ibFor B phase currents, icFor C phase currents
The data of fault type and failure are uploaded main website by the alarm with radio-cell by wireless GPRS；When equipment from
When inspection is broken down, upload warning message to main website, self-test information by radio-cell is to check resistive dissipation, switch motion
No success.
The outer signal source of applying is connected in parallel on after signal sequence switch, and signal sequence switch S1 normal conditions are closure, when
Outside signal source is applied to detect>After 0.5A, signal sequence switch S1 switches start switching according to certain frequency, produce certain sequence
Low and high level, the time of a cycle is T, and wherein high level time is th, low level time tl.
It is current-limiting resistance to apply signal impedance X=R+j ω L+1/j ω c, wherein R outside described, and L is shunt reactor group, and C is
Shunt capacitor.
That signal impedance is applied outside described limits scope as [R R+j ω L+1/j ω c]；Described limits scope as 10-18A.
The invention has the advantages that a kind of distribution network failure indicator LC tunings of the present invention are outer to apply signal source, in distribution
When net breaks down, switched by adjusting shunt capacitor switch and shunt reactor, regulation capacitor capacitance, reactor induction reactance
Value, make to apply signal impedance outside and earth current is limited in certain limit, realize the detection to Distribution Network Failure.
Brief description of the drawings
Fig. 1 is to apply signal source device schematic diagram outside fault detector；
Fig. 2 is to apply signal source characteristic sequence impedance adjustment schematic diagram outside fault detector；
Fig. 3 is to apply signal source control system architecture schematic diagram outside fault detector.
Embodiment
The embodiment of the present invention is as shown in the figure.
A kind of distribution network failure indicator LC tunings of the present embodiment are outer to apply signal source, including control system, shunt capacitor
Group C, shunt reactor group L, series limiting resistor R, shunt capacitor switch SC, shunt reactor switch SL and signal sequence are opened
S1 is closed, as shown in Figure 1.
The shunt capacitor group C series and parallel capacitor switch SC, shunt reactor group L series and parallel reactor switch
SL, it is connected in parallel on signal sequence switch S1；After the shunt capacitor group C other end is in parallel with the shunt reactor group L other end
It is grounded after connection series limiting resistor R；Signal sequence switch S1 input connection power distribution network three-phases (A, B, C).
When it is outer apply signal source and detect after, signal sequence switch S1 starts switching according to certain frequency, produces certain sequence
Low and high level；When a failure occurs it, SC is switched by shunt capacitor and shunt reactor switchs SL, regulation external signal source
Shunt capacitor capacitance, reactor induction reactance value, make outer to apply signal impedance and earth current is limited to certain limit.
As shown in figure 3, the control system includes collecting unit, computing unit, alarm and radio-cell and output control
Unit.
The collecting unit input connects power distribution network transformer, and output end connects the input of computing unit；Calculate single
The output end connection alarm of member and radio-cell；Another output end connection output control unit of computing unit；Output
The output end of control unit connects each signal sequence switch.
As shown in Fig. 2 after signal source device parallel connection and circuit outlet switch are applied outside fault detector, signal sequence switch
S1 normal conditions are closure, are detected when applying signal source outside>After 0.5A, signal sequence switch S1 starts to throw according to certain frequency
Cut, produce the low and high level of certain sequence, the time of a cycle is T, and wherein high level time is th, and low level time is
tl。
Applying signal impedance outside is：X=R+j ω L+1/j ω c, wherein R are current-limiting resistance, and L is shunt reactor group, and C is simultaneously
Join capacitor.
Distribution line impedance is：X1=R1+j ω L1+1/j ω c1, wherein R1 are line resistance, and L1 is line inductance, C1
For line capacitance.Distribution line impedance is generally capacitive reactances.
Upon the occurrence of a ground fault, the shunt reactor group in external signal source is adjusted, shunt capacitor adjusts impedance in real time
Value, makes earth current be limited in 10-18A scopes.SC is switched by shunt capacitor, shunt reactor switchs SL switches, tune
Economize on electricity container capacitance, reactor induction reactance value, so as to realize the outer size for applying signal impedance X of regulation, limit outer signal impedance of applying
In section at [R R+j ω L+1/j ω c].
When single-phase earthing occurs for circuit, after the shunt reactor switch SL1 inputs 5ms for applying signal source outside, start switching
Signal sequence switchs S1, and when metallic ground occurs, impedance ground r is less than 10 Ω, is calculated according to i=u/r+X, bigger, adjusts
Whole shunt reactor switch SL1-SLn switches, increase reactance；Shunt capacitor switch SC1-SCn is adjusted, reduces capacitor；Together
When compensated line capacitive reactances, make in 10-18A scopes, not only reduce, while reduce the impact to system.
When high resistance ground occurs, impedance ground r is more than 600 Ω, is calculated according to i=u/r+X, smaller, and adjustment is in parallel
Reactor switch SL1-SLn, reduce reactance, adjustment shunt capacitor switch SC1-SCn, increase capacitor；Adjust external signal
Source reactance, electric capacity are with induction reactance or capacitive reactance on this compensated line so thatWhen, impedance is minimum, now caused by ground connection
Zero-sequence current is maximum, so that zero-sequence current amplifies so that detection is more accurate, and further reduction is outer applies signal fault instruction
The dead band of device.
When arc grounding occurs, when larger, adjustment shunt reactor switch SL1-SLn switches, increase reactance；Adjustment is simultaneously
Join capacitor switch SC1-SCn, reduce capacitor；Compensated line capacitive reactances simultaneously, make, in 10-18A scopes, to continue switching 1
Minute, fault detector uploads fault message, and light of dealing out the cards, and otherwise keeps normal operating condition.When smaller, adjustment is in parallel
Reactor switch SL1-SLn, reduce reactance；Shunt capacitor switch SC1-SCn is adjusted, increases capacitor；Compensated line simultaneously
Capacitive reactances, make in 10-18A scopes, continue switching 10 minutes, fault detector uploads fault message, and light of dealing out the cards, otherwise
Keep normal operating condition.
Claims (5)
1. a kind of distribution network failure indicator LC tunings are outer to apply signal source, it is characterised in that the outer signal source of applying includes control
System, shunt capacitor group, shunt reactor group, series limiting resistor, shunt capacitor switch, shunt reactor switch and letter
Number sequence switch；
The shunt capacitor group series and parallel capacitor switch, shunt reactor group series and parallel reactor switch, is connected in parallel on
On signal sequence switch；The other end of shunt capacitor group is with being connected series connection current limliting electricity after the other end parallel connection of shunt reactor group
It is grounded after resistance；Signal sequence switch input terminal connects power distribution network three-phase；
When it is outer apply signal source and detect earth current after, signal sequence switch starts switching according to certain frequency, produces a sequencing
The low and high level of row；When a failure occurs it, switched by shunt capacitor switch and shunt reactor, regulation external signal source
Shunt capacitor capacitance, reactor induction reactance value, make to apply signal impedance outside and short circuit current is limited to certain limit.
2. a kind of distribution network failure indicator LC tunings according to claim 1 are outer to apply signal source, it is characterised in that described
Control system includes collecting unit, computing unit, alarm and radio-cell and output control unit；
The collecting unit input connects power distribution network transformer, and output end connects the input of computing unit；Computing unit
One output end connection alarm and radio-cell；Another output end connection output control unit of computing unit；Output control
The output end of unit connects each signal sequence switch；
The sample frequency 10KHZ of the collecting unit, gather A, B, C three-phase current；Control unit controlling switch is cut-off, and in fact
Apply the status information of detection switch；
The monophase current of collection is synthesized zero-sequence current by the computing unit；
The data of fault type and failure are uploaded main website by the alarm with radio-cell by wireless GPRS；When equipment self-inspection goes out
During existing failure, warning message is uploaded to main website by radio-cell, self-test information for check resistive dissipation, switch motion whether into
Work(.
3. a kind of distribution network failure indicator LC tunings according to claim 1 are outer to apply signal source, it is characterised in that described
Apply signal source outside to be connected in parallel on after circuit outlet switch, signal sequence switch normal condition is closure, when outer signal source of applying detects
To earth current>After 0.5A, signal sequence switch according to certain frequency starts switching, produces the low and high level of certain sequence, and one
The time in individual cycle is T, and wherein high level time is th, low level time tl, is otherwise remained stationary as.
4. a kind of distribution network failure indicator LC tunings according to claim 1 are outer to apply signal source, it is characterised in that described
It is current-limiting resistance to apply signal impedance X=R+j ω L+1/j ω c, wherein R outside, and L is shunt reactor group, and C is shunt capacitor.
5. a kind of distribution network failure indicator LC tunings according to claim 1 are outer to apply signal source, it is characterised in that described
That applies signal impedance outside limits scope as [R R+j ω L+1/j ω c]；The short circuit current limits scope as 10-18A.
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|---|---|---|---|
| CN201710747518.5A CN107340416B (en) | 2017-08-28 | 2017-08-28 | LC tuning external application signal source of power distribution network fault indicator |
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|---|---|---|---|
| CN201710747518.5A CN107340416B (en) | 2017-08-28 | 2017-08-28 | LC tuning external application signal source of power distribution network fault indicator |
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| Publication Number | Publication Date |
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| CN107340416A true CN107340416A (en) | 2017-11-10 |
| CN107340416B CN107340416B (en) | 2020-04-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427087A (en) * | 2018-02-05 | 2018-08-21 | 国网江西省电力有限公司电力科学研究院 | A kind of Novel fault indicator detection platform |
| CN109521331A (en) * | 2018-12-18 | 2019-03-26 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network applies the automatization test system of signal generation apparatus outside |
| CN110262609A (en) * | 2019-07-01 | 2019-09-20 | 四川英杰电气股份有限公司 | Circuit drives control method, system, power regulating system and device end |
| CN110658394A (en) * | 2018-06-29 | 2020-01-07 | 北京华峰测控技术股份有限公司 | Multi-station concurrent test method, control station and multi-station concurrent test device |
| CN110780156A (en) * | 2019-11-13 | 2020-02-11 | 国网山西省电力公司电力科学研究院 | Detection system of external signal generation device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427087A (en) * | 2018-02-05 | 2018-08-21 | 国网江西省电力有限公司电力科学研究院 | A kind of Novel fault indicator detection platform |
| CN110658394A (en) * | 2018-06-29 | 2020-01-07 | 北京华峰测控技术股份有限公司 | Multi-station concurrent test method, control station and multi-station concurrent test device |
| CN110658394B (en) * | 2018-06-29 | 2021-06-25 | 北京华峰测控技术股份有限公司 | Multi-station concurrent test method, control station and multi-station concurrent test device |
| CN109521331A (en) * | 2018-12-18 | 2019-03-26 | 国网重庆市电力公司电力科学研究院 | A kind of power distribution network applies the automatization test system of signal generation apparatus outside |
| CN109521331B (en) * | 2018-12-18 | 2021-01-29 | 国网重庆市电力公司电力科学研究院 | Automatic test system of power distribution network external signal generating device |
| CN110262609A (en) * | 2019-07-01 | 2019-09-20 | 四川英杰电气股份有限公司 | Circuit drives control method, system, power regulating system and device end |
| CN110262609B (en) * | 2019-07-01 | 2020-06-26 | 四川英杰电气股份有限公司 | Circuit driving control method, system, power regulation system and equipment terminal |
| CN110780156A (en) * | 2019-11-13 | 2020-02-11 | 国网山西省电力公司电力科学研究院 | Detection system of external signal generation device |
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