CN107991533A - Voltage-phase localization method based on single-phase cable - Google Patents
Voltage-phase localization method based on single-phase cable Download PDFInfo
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- CN107991533A CN107991533A CN201711215687.0A CN201711215687A CN107991533A CN 107991533 A CN107991533 A CN 107991533A CN 201711215687 A CN201711215687 A CN 201711215687A CN 107991533 A CN107991533 A CN 107991533A
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- Prior art keywords
- phase
- voltage
- current
- zero
- sequence current
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
-
- 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 the voltage-phase localization method based on single-phase cable, each distribution terminal detects power distribution network residual voltage value, judge whether that there occurs singlephase earth fault, in the traditional zero sequence current mutual inductor of each feed line leading-out terminal installation of substation bus bar, its zero-sequence current power frequency component is sent to substation's detection device by traditional zero sequence current mutual inductor secondary circuit, utilize the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by compared with setting normal current reference value, judging whether fault overcurrent；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；Calculate the Sudden Changing Rate of the phase voltage of each data acquisition device and the Sudden Changing Rate of phase current, handle the residual voltage and zero-sequence current of the collection of each data acquisition device, obtain the phase of residual voltage and all frequency components of zero-sequence current, the fixed phase of the coupled voltages phase working voltage of phase shift θ degree acquisition backward.
Description
Technical field
The present invention relates to power domain, and in particular to the voltage-phase localization method based on single-phase cable.
Background technology
In recent years, there occurs substantial amounts of cable terminal insulation breakdown even explosion accident, electricity in urban electric power cable run
The Condition assessment of insulation of cable terminal causes extensive concern and the great attention that Operation of Electric Systems safeguards unit.For actual fortune
Capable cable termination, which carries out the live detection of shelf depreciation and insulation diagnosis, still has many key issues not yet to solve, for example is difficult to
The problems such as obtaining the phase progress shelf depreciation phase analysis of working voltage.True PD letters are extracted by the inherent feature of PD signals
Number be the major issue that PD detections must solve, these signal characteristics include the time phase information of discharge pulse, time-frequency characteristics,
Duration etc..For the cable termination run under power-frequency voltage, the one or three quadrant in power-frequency voltage usually occurs for PD,
Therefore, the phase information of power frequency become help judge signal whether the important evidence for being PD, the application of traditional PD diagnostic analysis
Phase-amplitude spectrogram is also based on phase information foundation.Therefore, obtaining the voltage phase information of Devices to test becomes scene
The important technology work of PD detections.
The content of the invention
The technical problems to be solved by the invention are that the operation electricity of single-phase cable termination is pressed in the indirect measurement of high reliability
Phase is pressed, and it is an object of the present invention to provide middle voltage-phase localization method of the pressure based on single-phase cable is, and it is an object of the present invention to provide be based on single-phase electricity
The voltage-phase localization method of cable, solves the problems, such as that online high reliability detects the voltage-phase of high-tension apparatus to be measured.
The present invention is achieved through the following technical solutions：
Voltage-phase localization method based on single-phase cable, comprises the following steps：
A, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if event occurs
Barrier then enters step B, otherwise circulation step A；
B, in the traditional zero sequence current mutual inductor of each feed line leading-out terminal installation of substation bus bar, its zero-sequence current power frequency letter
Number sent to substation's detection device, judged by the zero sequence current signal single-phase by traditional zero sequence current mutual inductor secondary circuit
The circuit that earth fault occurs；
C, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by with setting normal current reference value
Compare, judge whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise
Output valve 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
D, the Sudden Changing Rate of the phase voltage of each data acquisition device and the Sudden Changing Rate of phase current are calculated, handles each number
According to the residual voltage and zero-sequence current of the collection of harvester, the phase of residual voltage and all frequency components of zero-sequence current is obtained
Position；
E, the fixed phase of coupled voltages phase phase shift θ degree acquisition backward working voltage, calculates coupled voltages and operation electricity
The method of phase angle θ between pressure isThe R1For metal patch coupled voltages sensor with
Insulation resistance, R2 between cable core are the input impedance of oscillograph, C1 is that the capacitance of rlc circuit, C2 are metal in step C
Capacitance between patch coupled voltages sensor and the earth.
Voltage-phase localization method based on single-phase cable, first measure line protection installation place faulted phase voltage,
Faulted phase current and zero-sequence current, measure other two normal phase voltages；Utilize the normal mutually electricity of two after line single phase grounding failure
Faulted phase voltage during compacting during computing electric power line normal operation.
Voltage-phase localization method based on single-phase cable, is occurred using small current neutral grounding system in the step B single-phase
Faulty line has the characteristics that different zero-sequence current mutual relation of electric voltage from non-fault line during earth fault, according to flowing through line
The zero-sequence current on road and the phase relation of residual voltage to carry out set to each Feeder Terminal Unit, and are uploaded to main website；It is main
The state bit value progress logical operation stood further according to Feeder Terminal Unit, completes the selection to faulty line；Then by right
The detection of each Feeder Terminal Unit state bit value in faulty line, completes the judgement and selection to fault section.
Compared with prior art, the present invention have the following advantages and advantages：
1st, the voltage-phase localization method of the invention based on single-phase cable, in that context it may be convenient to gather the electricity of single-phase cable termination
Pressure phase provides more reliable foundation for partial discharge judgement, and safe, simple to operation；
2nd, the voltage-phase localization method of the invention based on single-phase cable, it is not necessary to carried out in the primary side of working line straight
Tape splicing electrical testing, eliminates stringent livewire work and examines, in contrast more safety and conveniently.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment, the present invention is made
Further to describe in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment 1
Voltage-phase localization method of the invention based on single-phase cable, comprises the following steps：
A, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if event occurs
Barrier then enters step B, otherwise circulation step A；
B, in the traditional zero sequence current mutual inductor of each feed line leading-out terminal installation of substation bus bar, its zero-sequence current power frequency letter
Number sent to substation's detection device, judged by the zero sequence current signal single-phase by traditional zero sequence current mutual inductor secondary circuit
The circuit that earth fault occurs；
C, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by with setting normal current reference value
Compare, judge whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise
Output valve 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
D, the Sudden Changing Rate of the phase voltage of each data acquisition device and the Sudden Changing Rate of phase current are calculated, handles each number
According to the residual voltage and zero-sequence current of the collection of harvester, the phase of residual voltage and all frequency components of zero-sequence current is obtained
Position；
E, the fixed phase of coupled voltages phase phase shift θ degree acquisition backward working voltage, calculates coupled voltages and operation electricity
The method of phase angle θ between pressure isThe R1For metal patch coupled voltages sensor with
Insulation resistance, R2 between cable core are the input impedance of oscillograph, C1 is that the capacitance of rlc circuit, C2 are metal in step C
Capacitance between patch coupled voltages sensor and the earth.
The voltage-phase localization method based on single-phase cable, first measures the failure phase of line protection installation place
Voltage, faulted phase current and zero-sequence current, measure other two normal phase voltages；It is normal using two after line single phase grounding failure
Faulted phase voltage during the real-time computing electric power line normal operation of phase voltage.
The voltage-phase localization method based on single-phase cable, is sent out using small current neutral grounding system in the step B
Faulty line has the characteristics that different zero-sequence current mutual relation of electric voltage from non-fault line during raw singlephase earth fault, according to
The zero-sequence current of current through line and the phase relation of residual voltage to carry out set to each Feeder Terminal Unit, and are uploaded to master
Stand；Main website carries out logical operation further according to the state bit value of Feeder Terminal Unit, completes the selection to faulty line；Then lead to
The detection to each Feeder Terminal Unit state bit value in faulty line is crossed, completes judgement and selection to fault section.
Above-described embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect further
Describe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should all include
Within protection scope of the present invention.
Claims (3)
1. the voltage-phase localization method based on single-phase cable, it is characterised in that comprise the following steps：
A, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if breaking down
B is entered step, otherwise circulation step A；
B, lead in the traditional zero sequence current mutual inductor of each feed line leading-out terminal installation of substation bus bar, its zero-sequence current power frequency component
Cross traditional zero sequence current mutual inductor secondary circuit to send to substation's detection device, single-phase earthing is judged by the zero sequence current signal
The circuit that failure occurs；
C, using the electric current of current monitoring device dynamic monitoring power distribution network monitoring point, by compared with setting normal current reference value
Compared with judging whether fault overcurrent；When there are during fault overcurrent, each independent comparators export alarming value 1, otherwise export
Value 0；Limit value is got over by the fault overcurrent for controlling main website to collect all monitoring points, forms electric current warning message collection；
D, the Sudden Changing Rate of the phase voltage of each data acquisition device and the Sudden Changing Rate of phase current are calculated, each data is handled and adopts
The residual voltage and zero-sequence current of the collection of acquisition means, obtain the phase of residual voltage and all frequency components of zero-sequence current；
E, phase shift θ degree obtains the fixed phase of working voltage to coupled voltages phase backward, calculate coupled voltages and working voltage it
Between the method for phase angle θ beThe R1For metal patch coupled voltages sensor and cable
Insulation resistance, R2 between core are the input impedance of oscillograph, C1 is that the capacitance of rlc circuit, C2 are metal patch in step C
Capacitance between coupled voltages sensor and the earth.
2. the voltage-phase localization method according to claim 1 based on single-phase cable, it is characterised in that first measurement transmission of electricity
Faulted phase voltage, faulted phase current and the zero-sequence current of route protection installation place, measure other two normal phase voltages；Utilize circuit
Faulted phase voltage during the real-time computing electric power line normal operation of two normal phase voltages after singlephase earth fault.
3. the voltage-phase localization method according to claim 1 based on single-phase cable, it is characterised in that the step B
Faulty line has different zero-sequence currents from non-fault line during the middle generation singlephase earth fault using small current neutral grounding system
The characteristics of mutual relation of electric voltage, according to the phase relation of the zero-sequence current of current through line and residual voltage come to each line feed terminals
Equipment carries out set, and is uploaded to main website；Main website carries out logical operation further according to the state bit value of Feeder Terminal Unit, completes
Selection to faulty line；Then by the detection to each Feeder Terminal Unit state bit value in faulty line, a pair event is completed
Hinder the judgement and selection of section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711215687.0A CN107991533A (en) | 2017-11-28 | 2017-11-28 | Voltage-phase localization method based on single-phase cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711215687.0A CN107991533A (en) | 2017-11-28 | 2017-11-28 | Voltage-phase localization method based on single-phase cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107991533A true CN107991533A (en) | 2018-05-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711215687.0A Withdrawn CN107991533A (en) | 2017-11-28 | 2017-11-28 | Voltage-phase localization method based on single-phase cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110667383A (en) * | 2018-06-08 | 2020-01-10 | 舍弗勒技术股份两合公司 | Monitoring system for detecting high-voltage circuit of vehicle and vehicle |
| CN112213662A (en) * | 2020-09-07 | 2021-01-12 | 日照钢铁控股集团有限公司 | High-voltage cable single-phase earth fault judgment device and method |
-
2017
- 2017-11-28 CN CN201711215687.0A patent/CN107991533A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110667383A (en) * | 2018-06-08 | 2020-01-10 | 舍弗勒技术股份两合公司 | Monitoring system for detecting high-voltage circuit of vehicle and vehicle |
| CN112213662A (en) * | 2020-09-07 | 2021-01-12 | 日照钢铁控股集团有限公司 | High-voltage cable single-phase earth fault judgment device and method |
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| PB01 | Publication | ||
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Application publication date: 20180504 |