CN107991588A - A kind of transient fault signal realizes line insulation monitoring method - Google Patents
A kind of transient fault signal realizes line insulation monitoring method Download PDFInfo
- Publication number
- CN107991588A CN107991588A CN201711206999.5A CN201711206999A CN107991588A CN 107991588 A CN107991588 A CN 107991588A CN 201711206999 A CN201711206999 A CN 201711206999A CN 107991588 A CN107991588 A CN 107991588A
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- Prior art keywords
- fault
- transient
- sequence current
- msub
- transient zero
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of transient fault signal to realize line insulation monitoring method, gathers the transient zero-sequence current of each test point on each bar circuit in busbar exit；Each distribution terminal detects power distribution network residual voltage value, judge whether that there occurs singlephase earth fault, when faulty signal, by the way that two fault traveling wave sampled point monitorings are realized with the monitoring to the fault traveling wave direction of propagation and spread speed, the sampled point for first monitoring fault traveling wave electric current is the starting source direction of fault current；By monitoring to obtain phase data to operating frequency phase sampled point；Start feeder terminal unit, detect circuit insulating properties, testing result is sent to staff.The present invention only utilizes transient zero-sequence current signal, applied widely, and method is simple and easily realizes.
Description
Technical field
The present invention relates to power domain, and in particular to a kind of transient fault signal realizes line insulation monitoring method.
Background technology
Feeder Terminal Unit (abbreviation FTU), has remote control, remote signalling, fault detection capability, and leads to power distribution automation main station
Letter, there is provided distribution system operating condition and various parameters, that is, monitoring and controlling information needed, including on off state, electrical energy parameter, phase
Between failure, earth fault and parameter during failure, and perform the order that distribution main website issues, controller switching equipment is adjusted and
Control, realizes the functions such as fault location, Fault Isolation and non-faulting region fast recovery of power supply.
Power distribution network have it is complicated, load the characteristics of more dispersed, the probability that transmission line of electricity breaks down is very high, especially
It is the singlephase earth fault of small current system.When low current singlephase earth fault occurs for system, fault current very little, failure letter
It is number faint, cause fault detect, route selection, positioning all highly difficult.After small current grounding fault occurs for circuit, three-phase voltage is still right
Claim, so system can run 1~2h, or even longer time, the reliability of power supply can be improved.But tape jam cannot be transported for a long time
OK, if run time is long to be easy to cause phase fault, the harm brought to electric system is more serious.It can be seen from the above that
The position of singlephase earth fault, and timely processing are found in time, to improving power supply reliability, ensureing controller switching equipment tool safe for operation
It is of great significance.
The content of the invention
The technical problems to be solved by the invention are that fault current is very when low current singlephase earth fault occurs for system
Small, fault-signal is faint, causes fault detect highly difficult, and it is an object of the present invention to provide a kind of transient fault signal realizes line insulation
Monitoring method, solves when low current singlephase earth fault occurs for system, fault current very little, fault-signal is faint, causes event
The problem of hindering detection difficult.
The present invention is achieved through the following technical solutions：
A kind of transient fault signal realizes line insulation monitoring method, comprises the following steps：
A, the transient zero-sequence current of each test point on each bar circuit in busbar exit is gathered；
B, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if event occurs
Barrier then enters step C, otherwise circulation step A；
C, when faulty signal, by being realized to the monitoring of two fault traveling wave sampled points to the fault traveling wave direction of propagation and
The monitoring of spread speed, the sampled point for first monitoring fault traveling wave electric current are the starting source direction of fault current；By to work
Frequency phase sample point monitors to obtain phase data；
D, start feeder terminal unit, detect circuit insulating properties, testing result is sent to staff.
A kind of transient fault signal realizes line insulation monitoring method, by each bar route in the busbar exit collected
The transient zero-sequence current of each test point and threshold value IstCompare, if having 3 in the transient zero-sequence current of 5 continuous test points
A and above test point transient zero-sequence current amplitude is more than threshold value Ist, then feeder terminal unit start and record failure letter
Breath；Otherwise feeder terminal unit does not start, and continues to sample transient zero-sequence current.
A kind of transient fault signal realizes line insulation monitoring method, is calculated in the step B each on each bar circuit
The transient zero-sequence current amplitude I of test pointfMethod be：
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
A kind of transient fault signal realizes line insulation monitoring method, in step B, pass through two according to fault-signal therefore
Hinder the priority of traveling wave sampled point and the time judges whether the sampled point is that section occurs for failure and failure.
Compared with prior art, the present invention have the following advantages and advantages：
1st, a kind of transient fault signal of the present invention realizes line insulation monitoring method, automatic detection, reduce manually into
This, improves reliability；
2nd, a kind of transient fault signal of the present invention realizes line insulation monitoring method, is only believed using transient zero-sequence current
Number, applied widely, method is simple and easily realizes.
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
A kind of transient fault signal of the present invention realizes line insulation monitoring method, comprises the following steps：
A, the transient zero-sequence current of each test point on each bar circuit in busbar exit is gathered；
B, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if event occurs
Barrier then enters step C, otherwise circulation step A；
C, when faulty signal, by being realized to the monitoring of two fault traveling wave sampled points to the fault traveling wave direction of propagation and
The monitoring of spread speed, the sampled point for first monitoring fault traveling wave electric current are the starting source direction of fault current；By to work
Frequency phase sample point monitors to obtain phase data；
D, start feeder terminal unit, detect circuit insulating properties, testing result is sent to staff.
By the transient zero-sequence current of each test point on each bar route in the busbar exit collected and threshold value IstCompare
Compared with if the transient zero-sequence current amplitude for having 3 and above test point in the transient zero-sequence current of 5 continuous test points is more than door
Threshold value Ist, then feeder terminal unit start and record fault message；Otherwise feeder terminal unit does not start, and continues to transient zero-sequence
Electric current is sampled.The transient zero-sequence current amplitude I of each test point on each bar circuit is calculated in the step BfMethod be：
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.In step B,
Judge whether the sampled point is that failure and failure are sent out by the priority and time of two fault traveling wave sampled points according to fault-signal
Raw 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 (4)
1. a kind of transient fault signal realizes line insulation monitoring method, it is characterised in that comprises the following steps：
A, the transient zero-sequence current of each test point on each bar circuit in busbar exit is gathered；
B, each distribution terminal detection power distribution network residual voltage value, judges whether there occurs singlephase earth fault, if breaking down
C is entered step, otherwise circulation step A；
C, when faulty signal, by realizing two fault traveling wave sampled point monitorings to the fault traveling wave direction of propagation and propagation
The monitoring of speed, the sampled point for first monitoring fault traveling wave electric current are the starting source direction of fault current；By to power frequency phase
Position sampled point monitors to obtain phase data；
D, start feeder terminal unit, detect circuit insulating properties, testing result is sent to staff.
2. a kind of transient fault signal according to claim 1 realizes line insulation monitoring method, it is characterised in that will
The transient zero-sequence current of each test point and threshold value I on each bar route in busbar exit collectedstCompare, if at 5
The transient zero-sequence current amplitude for having 3 and above test point in the transient zero-sequence current of continuous test point is more than threshold value Ist, then
Feeder terminal unit starts and records fault message；Otherwise feeder terminal unit does not start, and continues to carry out transient zero-sequence current
Sampling.
3. a kind of transient fault signal according to claim 2 realizes line insulation monitoring method, it is characterised in that institute
State the transient zero-sequence current amplitude I that each test point on each bar circuit is calculated in step BfMethod be：
<mrow>
<msub>
<mi>I</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>1</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</mfrac>
<msubsup>
<mo>&Integral;</mo>
<mn>0</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</msubsup>
<msup>
<msub>
<mi>i</mi>
<mn>0</mn>
</msub>
<mn>2</mn>
</msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</msqrt>
</mrow>
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
4. a kind of transient fault signal according to claim 1 realizes line insulation monitoring method, it is characterised in that step
In rapid B, according to fault-signal by the priority and time of two fault traveling wave sampled points judge the sampled point whether be failure and
Section occurs for failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711206999.5A CN107991588A (en) | 2017-11-27 | 2017-11-27 | A kind of transient fault signal realizes line insulation monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711206999.5A CN107991588A (en) | 2017-11-27 | 2017-11-27 | A kind of transient fault signal realizes line insulation monitoring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107991588A true CN107991588A (en) | 2018-05-04 |
Family
ID=62033361
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711206999.5A Withdrawn CN107991588A (en) | 2017-11-27 | 2017-11-27 | A kind of transient fault signal realizes line insulation monitoring method |
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| CN (1) | CN107991588A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596948A (en) * | 2018-12-10 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | A kind of distribution line state of insulation evaluation method |
-
2017
- 2017-11-27 CN CN201711206999.5A patent/CN107991588A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596948A (en) * | 2018-12-10 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | A kind of distribution line state of insulation evaluation method |
| CN109596948B (en) * | 2018-12-10 | 2020-12-15 | 国网山东省电力公司电力科学研究院 | Distribution line insulation state evaluation method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180504 |