CN109490718A - A kind of earth current based on controllable voltage source compensates selection method entirely - Google Patents
A kind of earth current based on controllable voltage source compensates selection method entirely Download PDFInfo
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- CN109490718A CN109490718A CN201910049114.8A CN201910049114A CN109490718A CN 109490718 A CN109490718 A CN 109490718A CN 201910049114 A CN201910049114 A CN 201910049114A CN 109490718 A CN109490718 A CN 109490718A
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- voltage source
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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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- 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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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the present application discloses a kind of earth current based on controllable voltage source and compensates selection method entirely, which comprises when single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、I02…I0n；Controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude IoutAnd the corresponding second zero-sequence current I ' of each route01、I’02…I’0n；Current amplitude I is exported according to first zero-sequence current of each route, second zero-sequence current of each route and the controllable voltage sourceout, determine faulty line.The method of the embodiment of the present application is simple, and it is accurate to calculate, and the advantage of strong applicability can use in controllable voltage source individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil, reduce the full compensation of ground route selection difficulty of controllable voltage source.
Description
Technical field
This application involves technical field of electric power more particularly to a kind of earth current based on controllable voltage source to compensate route selection entirely
Method.
Background technique
In network system, especially in low and medium voltage distribution network system, singlephase earth fault accounts for the absolute majority of failure sum.
The neutral grounding mode of low and medium voltage distribution network mainly have isolated neutral mode, neutral by arc extinction coil grounding mode or
Neutral point is through low resistance earthing mode.Under isolated neutral mode and neutral by arc extinction coil grounding mode, correctly
Earthing wire-selecting (also known as small current line selection), provide larger help to the timely permanent fault that excludes.But small current neutral grounding is selected
The accuracy rate of line is generally only capable of reaching 80%, and route selection result often only has reference value, and correctness cannot ensure.
So how correct route selection becomes those skilled in the art's urgent problem to be solved.
Summary of the invention
This application provides a kind of earth currents based on controllable voltage source to compensate selection method entirely, to solve the prior art
The low problem of middle earthing wire-selecting accuracy.
The application provides a kind of earth current based on controllable voltage source and compensates selection method entirely, which comprises
When single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、I02…I0n；
Controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude IoutAnd each line
The corresponding second zero-sequence current I ' in road01、I’02…I’0n；
According to first zero-sequence current of each route, second zero-sequence current of each route and described controllable
Voltage source exports current amplitude Iout, determine faulty line.
Further, described electric according to first zero-sequence current of each route, second zero sequence of each route
Stream and the controllable voltage source export current amplitude Iout, the step of determining faulty line includes:
The first zero-sequence current of each route and the difference of the second zero-sequence current are calculated, and calculates the difference of each difference
It is worth absolute value；
Maximum difference absolute value is chosen, and using difference corresponding to the maximum difference absolute value as primary election value；
Current amplitude I is exported according to the primary election value and the controllable voltage sourceout, determine faulty line.
Further, described that current amplitude I is exported according to primary election value and the controllable voltage sourceout, determine faulty line
Step includes:
Judge whether the primary election value is negative value；
If the primary election value is negative value, judge that the maximum difference absolute value and controllable voltage source output current amplitude are exhausted
Whether difference threshold is less than to the difference of value；
If the difference of the maximum difference absolute value and controllable voltage source output current amplitude absolute value is less than difference threshold
Value, it is determined that route corresponding to the primary election value is ground path.
Further, the method also includes: if the primary election value be nonnegative value, it is determined that busbar grounding.
Further, the method also includes: if the maximum difference absolute value and controllable voltage source export electric current width
The difference for being worth absolute value is not less than difference threshold, it is determined that busbar grounding.
From the above technical scheme, a kind of earth current based on controllable voltage source of the application compensates route selection side entirely
Method, which comprises when single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、I02…
I0n；Controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude IoutAnd each route pair
The the second zero-sequence current I ' answered01、I’02…I’0n；According to first zero-sequence current of each article of route, each article of route described
Two zero-sequence currents and the controllable voltage source export current amplitude Iout, determine faulty line.The method letter of the embodiment of the present application
Single, it is accurate to calculate, the advantage of strong applicability, can be in controllable voltage source individually full collocation structure or controllable voltage source parallel connection extinguishing arc
It is used in the full collocation structure of coil, reduces the full compensation of ground route selection difficulty of controllable voltage source.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structure that the electric loop that earth current compensates entirely is implemented separately in a kind of controllable voltage source provided by the present application
Schematic diagram；
Fig. 2 is that a kind of controllable voltage source parallel connection arc suppression coil provided by the present application is grounded electrical time that electric current compensates entirely
The structural schematic diagram on road；
Fig. 3 is the flow chart that a kind of earth current based on controllable voltage source provided by the present application compensates selection method entirely.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.Below in conjunction with attached drawing,
The technical scheme provided by various embodiments of the present application will be described in detail.
As shown in figure 3, a kind of earth current based on controllable voltage source provided by the present application compensates the stream of selection method entirely
Cheng Tu, which comprises
Step S101, when single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、
I02…I0n；
Specifically, the network system includes controllable voltage source, grounding transformer and each route in this application.Fig. 1
The electric loop that earth current compensates entirely is implemented separately for a kind of controllable voltage source, Fig. 2 is a kind of controllable voltage source parallel connection extinguishing arc
Coil is grounded the electric loop that electric current compensates entirely, and the embodiment of the present application can be used for Fig. 1 and controllable voltage source illustrated in fig. 2
Earth current compensates circuit entirely.In addition, circuit is compensated entirely if any other similar controllable voltage source earth currents, it also can be using this
Apply for the earthing wire-selecting method of embodiment.
By each route label of network system, marking circuit number is 1,2...n, after single-phase earthing occurs, record
First zero-sequence current I of each route01、I02…I0n。
Step S102, controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude
IoutAnd the corresponding second zero-sequence current I ' of each route01、I’02…I’0n；
Step S103, according to second zero-sequence current of first zero-sequence current of each route, each route with
And the controllable voltage source exports current amplitude Iout, determine faulty line.
The application has implementation method simple, and it is accurate to calculate, and the advantage of strong applicability can be individually complete in controllable voltage source
It is used in collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil, reduces the full compensation of ground choosing of controllable voltage source
Line difficulty.
The embodiment of the present application provides a kind of earth current based on controllable voltage source and compensates selection method, controllable voltage source entirely
Whole earth currents or ground connection residual flow are compensated, the route zero-sequence current spy that ground path zero-sequence current changes before and after compensation is utilized
Point selects ground path.A kind of route selection side quickly, effectively, easy is provided for the earthing wire-selecting under the side's of compensation grounding type entirely
Method.
Further, described electric according to first zero-sequence current of each route, second zero sequence of each route
Stream and the controllable voltage source export current amplitude Iout, the step of determining faulty line includes:
The first zero-sequence current of each route and the difference of the second zero-sequence current are calculated, and calculates the difference of each difference
It is worth absolute value；
Maximum difference absolute value is chosen, and using difference corresponding to the maximum difference absolute value as primary election value；
Current amplitude I is exported according to the primary election value and the controllable voltage sourceout, determine faulty line.
Further, described that current amplitude I is exported according to primary election value and the controllable voltage sourceout, determine faulty line
Step includes:
Judge whether the primary election value is negative value；
If the primary election value is negative value, judge that the maximum difference absolute value and controllable voltage source output current amplitude are exhausted
Whether difference threshold is less than to the difference of value, difference threshold is usually less than 2A；
If the difference of the maximum difference absolute value and controllable voltage source output current amplitude absolute value is less than difference threshold
Value, it is determined that route corresponding to the primary election value is ground path.
Specifically, in system single-phase earthing, record circuit zero-sequence current amplitude.Earth current is carried out in controllable voltage source
After compensation, record circuit zero-sequence current amplitude again.It is basically unchanged using non-fault line zero-sequence current, ground path zero sequence electricity
The maximum characteristic of rheologyization, selects ground path.
The present invention proposes that after system single-phase earthing, controllable voltage source is compensated entirely.It is mended by comparison controllable voltage source
The significant change of front and back route zero-sequence current is repaid, determines ground path.
Further, the method also includes: if the primary election value be nonnegative value, it is determined that busbar grounding.
Further, the method also includes: if the maximum difference absolute value and controllable voltage source export electric current width
The difference for being worth absolute value is not less than difference threshold, it is determined that busbar grounding.
From the above technical scheme, a kind of earth current based on controllable voltage source of the application compensates route selection side entirely
Method, which comprises when single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、I02…
I0n；Controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude IoutAnd each route pair
The the second zero-sequence current I ' answered01、I’02…I’0n；According to first zero-sequence current of each article of route, each article of route described
Two zero-sequence currents and the controllable voltage source export current amplitude Iout, determine faulty line.The method letter of the embodiment of the present application
Single, it is accurate to calculate, the advantage of strong applicability, can be in controllable voltage source individually full collocation structure or controllable voltage source parallel connection extinguishing arc
It is used in the full collocation structure of coil, reduces the full compensation of ground route selection difficulty of controllable voltage source.
Those skilled in the art will readily occur to its of the application after considering specification and practicing application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (5)
1. a kind of earth current based on controllable voltage source compensates selection method entirely, which is characterized in that the described method includes:
When single-phase earthing occurs for system, the corresponding first zero-sequence current I of record each route01、I02…I0n；
Controllable voltage source is subjected to full compensation output, records the controllable voltage source output current amplitude IoutAnd each route pair
The the second zero-sequence current I ' answered01、I’02…I’0n；
According to first zero-sequence current of each route, second zero-sequence current and the controllable voltage of each route
Source exports current amplitude Iout, determine faulty line.
2. a kind of earth current based on controllable voltage source according to claim 1 compensates selection method entirely, feature exists
In, first zero-sequence current according to each route, second zero-sequence current of each route and described controllable
Voltage source exports current amplitude Iout, the step of determining faulty line includes:
The first zero-sequence current of each route and the difference of the second zero-sequence current are calculated, and the difference for calculating each difference is exhausted
To value；
Maximum difference absolute value is chosen, and using difference corresponding to the maximum difference absolute value as primary election value；
Current amplitude I is exported according to the primary election value and the controllable voltage sourceout, determine faulty line.
3. a kind of earth current based on controllable voltage source according to claim 2 compensates selection method entirely, feature exists
In described to export current amplitude I according to primary election value and the controllable voltage sourceout, the step of determining faulty line includes:
Judge whether the primary election value is negative value；
If the primary election value is negative value, judge that the maximum difference absolute value and controllable voltage source export current amplitude absolute value
Difference whether be less than difference threshold；
If the difference of the maximum difference absolute value and controllable voltage source output current amplitude absolute value is less than difference threshold,
Determine that route corresponding to the primary election value is ground path.
4. a kind of earth current based on controllable voltage source according to claim 3 compensates selection method entirely, feature exists
In, the method also includes: if the primary election value is nonnegative value, it is determined that busbar grounding.
5. a kind of earth current based on controllable voltage source according to claim 3 compensates selection method entirely, feature exists
In, the method also includes: if the difference of the maximum difference absolute value and controllable voltage source output current amplitude absolute value
Not less than difference threshold, it is determined that busbar grounding.
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| CN201910049114.8A CN109490718B (en) | 2019-01-18 | 2019-01-18 | Grounding current full-compensation line selection method based on controllable voltage source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910049114.8A CN109490718B (en) | 2019-01-18 | 2019-01-18 | Grounding current full-compensation line selection method based on controllable voltage source |
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| CN109490718B CN109490718B (en) | 2021-06-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291054A (en) * | 2008-06-11 | 2008-10-22 | 刘树祥 | Diagnosis and protection method for residue current of ground fault in electrical power system |
| CN101719663A (en) * | 2009-12-07 | 2010-06-02 | 梅素真 | Grounding line selection method, grounding line selection device and application system based on active component of zero sequence current |
| US20110063767A1 (en) * | 2009-09-17 | 2011-03-17 | Kasztenny Bogdan Z | Charging current compensation for line current differential protection |
| CN104898029A (en) * | 2015-06-25 | 2015-09-09 | 湖北工业大学 | Similarity single-phase earth fault line selection method based on active full compensation arc suppression control |
| CN108089098A (en) * | 2017-12-15 | 2018-05-29 | 梅素真 | A kind of selection method based on arc suppression coil earthing system |
-
2019
- 2019-01-18 CN CN201910049114.8A patent/CN109490718B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291054A (en) * | 2008-06-11 | 2008-10-22 | 刘树祥 | Diagnosis and protection method for residue current of ground fault in electrical power system |
| US20110063767A1 (en) * | 2009-09-17 | 2011-03-17 | Kasztenny Bogdan Z | Charging current compensation for line current differential protection |
| CN101719663A (en) * | 2009-12-07 | 2010-06-02 | 梅素真 | Grounding line selection method, grounding line selection device and application system based on active component of zero sequence current |
| CN104898029A (en) * | 2015-06-25 | 2015-09-09 | 湖北工业大学 | Similarity single-phase earth fault line selection method based on active full compensation arc suppression control |
| CN108089098A (en) * | 2017-12-15 | 2018-05-29 | 梅素真 | A kind of selection method based on arc suppression coil earthing system |
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