CN108008236A - A kind of method for detecting electrical equipment fault - Google Patents
A kind of method for detecting electrical equipment fault Download PDFInfo
- Publication number
- CN108008236A CN108008236A CN201711217589.0A CN201711217589A CN108008236A CN 108008236 A CN108008236 A CN 108008236A CN 201711217589 A CN201711217589 A CN 201711217589A CN 108008236 A CN108008236 A CN 108008236A
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- zero
- fault
- sequence current
- voltage
- earth fault
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of method for detecting electrical equipment fault, each distribution terminal detects power distribution network residual voltage value, judge whether that there occurs singlephase earth fault, the output valve of each zero sequence current mutual inductor on all outlet branches on same busbar is gathered or detected in real time, respectively obtains the magnitude of voltage of each road outlet and the current value of zero-sequence current；Regulation power direction threshold values is negative direction to be positive direction from busbar to branch；According to the zero-sequence current and voltage waveform of each branch the last fortnight ripple, obtain the fault component zero-sequence current voltage waveform before its failure and store；Selected faulty line, positions the Single-phase Ground Connection Failure of circuit, and present invention energy fast detecting failure position, faster, detection is more accurate for efficiency.
Description
Technical field
The present invention relates to power domain, and in particular to a kind of method for detecting electrical equipment fault.
Background technology
With the development of society, all trades and professions are continuously increased the demand of electric power, to the stability and safety of power grid power supply
The requirement of property also gradually steps up.Power equipment is the important component of electric power network system, and the safety and stability of power equipment is transported
An important factor for row is to ensure that power supply reliability.Since power equipment is chronically at operating status and is subject to the shadow of environmental factor
Ring, various failures often occur, the common form of expression is overall or local abnormal heating and paradoxical discharge, such as
Apparatus insulated performance degradation or insulation fault, which cause fever caused by dielectric loss increase with discharging, junction contacts are bad causes
Hot-spot and equipment leakage field caused by fever with electric discharge etc..Therefore the Warm status of power equipment is examined with discharge scenario
Survey, and analyzed and diagnosed with discharge scenario according to Warm status, be the important hand for ensureing power equipment and power grid reliability service
One of section.Since power equipment distribution is wide, large number of and has the particularity such as high temperature, high voltage when running, it is difficult to use
Conventional detection mode determines the Warm status and discharge scenario of power equipment.
The content of the invention
The inefficiency when technical problems to be solved by the invention are existing electric device maintenance failures, and detect not
Accurately, and it is an object of the present invention to provide a kind of method for detecting electrical equipment fault, solves the problems, such as electric device maintenance.
The present invention is achieved through the following technical solutions：
A kind of method for detecting electrical equipment fault, 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, the output valve of each zero sequence current mutual inductor on all outlet branches on same busbar is gathered or detects in real time, respectively
Obtain the magnitude of voltage of each road outlet and the current value of zero-sequence current；It is square from busbar to branch that regulation power direction threshold values, which is,
To, otherwise it is negative direction；According to the zero-sequence current and voltage waveform of each branch the last fortnight ripple, the fault component before its failure is obtained
Zero-sequence current voltage waveform simultaneously stores；
C, faulty line is selected, distribution terminal sends the ground connection event with class information to its upper level circuit distribution terminal
Hinder block signal；
D, by arc suppression coil compensation, the zero-sequence current amplitude between trouble point and substation changes, and passes through analysis
The amplitude change information of the zero-sequence current for each segmented node that substation detects, carries out the Single-phase Ground Connection Failure of circuit
Positioning.
A kind of method for detecting electrical equipment fault, in the step C, base is obtained using fault component zero-sequence current voltage
In the instantaneous power of Hilbert transform；The direction of instantaneous reactive is compared with pre-set power direction threshold value；If
Instantaneous reactive direction is just and is more than positive threshold, then is judged as positive failure, and failure occurs in this circuit；If instantaneous reactive
Direction is then judged as reverse fault, failure occurs in other circuits or busbar to bear and being less than reverse threshold value.
A kind of method for detecting electrical equipment fault, when the region of power grid is mutual by circuit hand in hand for different electric substations
During connection, it is mainly used for judging that singlephase earth fault is occurred in which electric substation, inlet wire zero sequence current mutual inductor is the power transformation
Interconnector inlet wire zero sequence current mutual inductor, singlephase earth fault refers to the single-phase earthing that feeder line occurs in the electric substation in area
Failure, the earth fault processing unit of the electric substation need to only handle singlephase earth fault in the electric substation, be not required to handle
Electric substation's singlephase earth fault outside area.
A kind of method for detecting electrical equipment fault, in the step B, the voltage detected according to voltage sensor judges
Whether traction auxiliary system occurs earth fault；If generation earth fault, the voltage that the voltage sensor is detected with
The ground voltage prestored is matched, and determines corresponding earth fault according to the ground voltage matched.
Compared with prior art, the present invention have the following advantages and advantages：
1st, a kind of method for detecting electrical equipment fault of the present invention, the present invention can fast detecting failure position, efficiency faster,
Detection is more accurate；
2nd, a kind of method for detecting electrical equipment fault of the present invention, the present invention is easy to operate, is easy to use.
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 method for detecting electrical equipment fault of the present invention, 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, the output valve of each zero sequence current mutual inductor on all outlet branches on same busbar is gathered or detects in real time, respectively
Obtain the magnitude of voltage of each road outlet and the current value of zero-sequence current；It is square from busbar to branch that regulation power direction threshold values, which is,
To, otherwise it is negative direction；According to the zero-sequence current and voltage waveform of each branch the last fortnight ripple, the fault component before its failure is obtained
Zero-sequence current voltage waveform simultaneously stores；
C, faulty line is selected, distribution terminal sends the ground connection event with class information to its upper level circuit distribution terminal
Hinder block signal；
D, by arc suppression coil compensation, the zero-sequence current amplitude between trouble point and substation changes, and passes through analysis
The amplitude change information of the zero-sequence current for each segmented node that substation detects, carries out the Single-phase Ground Connection Failure of circuit
Positioning.
In the step C, the instantaneous power based on Hilbert transform is obtained using fault component zero-sequence current voltage；Will
The direction of instantaneous reactive compares with pre-set power direction threshold value；If instantaneous reactive direction is just and more than positive threshold
Value, then be judged as positive failure, and failure occurs in this circuit；If instantaneous reactive direction is sentenced to bear and being less than reverse threshold value
Break and occur for reverse fault, failure in other circuits or busbar.
When the region of power grid is interconnected for different electric substations by circuit hand in hand, it is mainly used for judging single-phase earthing event
Barrier is occurred in which electric substation, and inlet wire zero sequence current mutual inductor is the interconnector inlet wire zero sequence current mutual inductance of the electric substation
Device, singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation, the earth fault processing of the electric substation in area
Device need to only be handled singlephase earth fault in the electric substation, be not required to the outer electric substation's singlephase earth fault for the treatment of region.
In the step B, the voltage detected according to voltage sensor judges to draw whether auxiliary system occurs ground connection event
Barrier；If generation earth fault, the voltage that the voltage sensor detects is matched with the ground voltage prestored,
And corresponding earth fault is determined according to the ground voltage matched.
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)
- A kind of 1. method for detecting electrical equipment fault, 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, the output valve of each zero sequence current mutual inductor on all outlet branches on same busbar is gathered or detected in real time, is respectively obtained The magnitude of voltage of each road outlet and the current value of zero-sequence current；Regulation power direction threshold values is is positive direction from busbar to branch, instead Be negative direction；According to the zero-sequence current and voltage waveform of each branch the last fortnight ripple, the fault component zero sequence before its failure is obtained Current-voltage waveform simultaneously stores；C, faulty line is selected, distribution terminal sends the earth fault with class information to its upper level circuit distribution terminal and closes Lock signal；D, by arc suppression coil compensation, the zero-sequence current amplitude between trouble point and substation changes, by analyzing power transformation The amplitude change information of the zero-sequence current for each segmented node that station detects, determines the Single-phase Ground Connection Failure of circuit Position.
- A kind of 2. method for detecting electrical equipment fault according to claim 1, it is characterised in that in the step C, profit The instantaneous power based on Hilbert transform is obtained with fault component zero-sequence current voltage；Set the direction of instantaneous reactive and in advance The power direction threshold value set compares；If instantaneous reactive direction is just and is more than positive threshold, it is judged as positive failure, therefore Barrier occurs in this circuit；If instantaneous reactive direction is judged as reverse fault, failure occurs to exist to bear and being less than reverse threshold value Other circuits or busbar.
- 3. a kind of method for detecting electrical equipment fault according to claim 1, it is characterised in that when the region of power grid is When different electric substations is interconnected by circuit hand in hand, it is mainly used for judging that singlephase earth fault is occurred in which electric substation Interior, inlet wire zero sequence current mutual inductor is the interconnector inlet wire zero sequence current mutual inductor of the electric substation, singlephase earth fault in area Refer to the singlephase earth fault that feeder line occurs in the electric substation, the earth fault processing unit of the electric substation only need to be in the electric substation Singlephase earth fault is handled, and is not required to the outer electric substation's singlephase earth fault for the treatment of region.
- A kind of 4. method for detecting electrical equipment fault according to claim 1, it is characterised in that in the step B, root The voltage detected according to voltage sensor judges to draw whether auxiliary system occurs earth fault；, will if generation earth fault The voltage that the voltage sensor detects is matched with the ground voltage prestored, and according to the ground voltage matched Determine corresponding earth fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217589.0A CN108008236A (en) | 2017-11-28 | 2017-11-28 | A kind of method for detecting electrical equipment fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711217589.0A CN108008236A (en) | 2017-11-28 | 2017-11-28 | A kind of method for detecting electrical equipment fault |
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| Publication Number | Publication Date |
|---|---|
| CN108008236A true CN108008236A (en) | 2018-05-08 |
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ID=62054348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711217589.0A Withdrawn CN108008236A (en) | 2017-11-28 | 2017-11-28 | A kind of method for detecting electrical equipment fault |
Country Status (1)
| Country | Link |
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| CN (1) | CN108008236A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347074A (en) * | 2018-08-03 | 2019-02-15 | 张安斌 | A kind of neutral grounding mode switching method |
| CN110311362A (en) * | 2019-07-24 | 2019-10-08 | 齐鲁工业大学 | Multiterminal enclosed type direction pilot protection method and device for transmission and distribution networks |
| CN112180217A (en) * | 2020-09-30 | 2021-01-05 | 福州大学 | Power distribution network single-phase earth fault section positioning method and system |
-
2017
- 2017-11-28 CN CN201711217589.0A patent/CN108008236A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347074A (en) * | 2018-08-03 | 2019-02-15 | 张安斌 | A kind of neutral grounding mode switching method |
| CN110311362A (en) * | 2019-07-24 | 2019-10-08 | 齐鲁工业大学 | Multiterminal enclosed type direction pilot protection method and device for transmission and distribution networks |
| CN112180217A (en) * | 2020-09-30 | 2021-01-05 | 福州大学 | Power distribution network single-phase earth fault section positioning method and system |
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Legal Events
| Date | Code | Title | Description |
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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: 20180508 |