CN107703423A - A kind of singlephase earth fault determination methods for transient zero-sequence current - Google Patents
A kind of singlephase earth fault determination methods for transient zero-sequence current Download PDFInfo
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- CN107703423A CN107703423A CN201711205331.9A CN201711205331A CN107703423A CN 107703423 A CN107703423 A CN 107703423A CN 201711205331 A CN201711205331 A CN 201711205331A CN 107703423 A CN107703423 A CN 107703423A
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- sequence current
- earth fault
- zero
- singlephase earth
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of singlephase earth fault determination methods for transient zero-sequence current, each distribution terminal detects power distribution network residual voltage value, judges whether there occurs singlephase earth fault, step B is entered if breaking down, otherwise circulation step A；Traditional zero sequence current mutual inductor is installed in each feed line leading-out terminal of substation bus bar, its zero-sequence current power frequency component delivers to transformer station's detection means by traditional zero sequence current mutual inductor secondary circuit, and the circuit of singlephase earth fault generation is judged by the zero sequence current signal；Selected faulty line, distribution terminal send the earth fault block signal with class information to its upper level circuit distribution terminal；By arc suppression coil compensation, the zero-sequence current amplitude between trouble point and transformer station changes, and the amplitude change information of the zero-sequence current of each segmented node detected by analyzing transformer station, the Single-phase Ground Connection Failure of circuit is positioned.
Description
Technical field
The present invention relates to power domain, and in particular to a kind of singlephase earth fault judgement side for transient zero-sequence current
Method.
Background technology
Hand-in-hand interconnection is also had between different transformer stations, when singlephase earth fault occurs, need to judge which is
The feeder line of seat transformer station could carry out accurate singlephase earth fault processing there occurs singlephase earth fault.It is and single-phase in generation
During earth fault, the change for distribution network its fault signature neutral point displacement voltage being linked together all is identical, it is difficult to
The quick judgement of fault zone is carried out according to Fault feature of single phase earthing, cannot if fault zone can not accurately be judged
Troubleshooting is carried out, thus quickly judges fault zone when singlephase earth fault occurs and takes timely troubleshooting
It is very important.
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, route selection, positioning is all highly difficult, and it is an object of the present invention to provide a kind of be used for transient zero-sequence electricity
The singlephase earth fault determination methods of stream, solve when low current singlephase earth fault occurs for system, fault current very little, failure
Weak output signal, cause fault detect, route selection, position the problem of all highly difficult.
The present invention is achieved through the following technical solutions：
A kind of singlephase earth fault determination methods for transient zero-sequence current, comprise 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, traditional zero sequence current mutual inductor, its zero-sequence current power frequency letter are installed in each feed line leading-out terminal of substation bus bar
Number transformer station's detection means is delivered to by traditional zero sequence current mutual inductor secondary circuit, judged by the zero sequence current signal single-phase
The circuit that earth fault occurs；
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 transformer station changes, and passes through analysis
The amplitude change information of the zero-sequence current for each segmented node that transformer station detects, the Single-phase Ground Connection Failure of circuit is carried out
Positioning.
A kind of singlephase earth fault determination methods for transient zero-sequence current, calculate in the step D each on circuit
The transient zero-sequence current amplitude If of test point method is：
Wherein, If is the amplitude of transient zero-sequence current；I0 is transient zero-sequence current values of the test point i in T0.
A kind of singlephase earth fault determination methods for transient zero-sequence current, when the region of power network is different electric substation
When interconnecting by circuit hand in hand, it is mainly used in judging that singlephase earth fault is occurred in which electric substation, inlet wire zero sequence electricity
Current transformer is the interconnector inlet wire zero sequence current mutual inductor of the electric substation, and singlephase earth fault refers to the feedback electric substation in area
The singlephase earth fault that line occurs, the earth fault processing unit of the electric substation need to only be entered to singlephase earth fault in the electric substation
Row processing, it is not required to the outer electric substation's singlephase earth fault for the treatment of region.
A kind of singlephase earth fault determination methods for transient zero-sequence current, the region of power network for same electric substation not
During with bus, inlet wire zero sequence current mutual inductor is mother zero sequence current mutual inductor, and singlephase earth fault refers on a certain bus in area
Feeder, earth fault processing unit on the bus removed to singlephase earth fault in area
Reason is outer should be able to also to be handled singlephase earth fault outside area, to adapt to need when the different buses of same electric substation close female operation
Will.
The present invention compared with prior art, has the following advantages and advantages：
1st, a kind of singlephase earth fault determination methods for transient zero-sequence current of the invention, not by neutral ground side
The influence of the factors such as moment, arc gap degree occurs for formula, the network architecture, failure, accurately analyzes single-phase-to-ground current in distribution
Direction is flowed through in net；
2nd, a kind of singlephase earth fault determination methods for transient zero-sequence current of the invention, only utilize transient zero-sequence current
Signal, 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 singlephase earth fault determination methods for transient zero-sequence current of the invention, comprise 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, traditional zero sequence current mutual inductor, its zero-sequence current power frequency letter are installed in each feed line leading-out terminal of substation bus bar
Number transformer station's detection means is delivered to by traditional zero sequence current mutual inductor secondary circuit, judged by the zero sequence current signal single-phase
The circuit that earth fault occurs；
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 transformer station changes, and passes through analysis
The amplitude change information of the zero-sequence current for each segmented node that transformer station detects, the Single-phase Ground Connection Failure of circuit is carried out
Positioning.
A kind of described singlephase earth fault determination methods for transient zero-sequence current, circuit is calculated in the step D
Above the transient zero-sequence current amplitude If of each test point method is：
Wherein, If is the amplitude of transient zero-sequence current；I0 is transient zero-sequence current values of the test point i in T0.
Described a kind of singlephase earth fault determination methods for transient zero-sequence current, when the region of power network is different
When electric substation is interconnected by circuit hand in hand, it is mainly used in judging that singlephase earth fault is occurred in which electric substation, inlet wire
Zero sequence current mutual inductor is the interconnector inlet wire zero sequence current mutual inductor of the electric substation, and singlephase earth fault refers to the power transformation in area
In feeder line occur singlephase earth fault, the earth fault processing unit of the electric substation only need to be to single-phase earthing in the electric substation
Failure is handled, and is not required to the outer electric substation's singlephase earth fault for the treatment of region.
A kind of described singlephase earth fault determination methods for transient zero-sequence current, the region of power network is same power transformation
Different buses when, inlet wire zero sequence current mutual inductor is mother zero sequence current mutual inductor, and singlephase earth fault refers to a certain in area
Feeder on bus, the earth fault processing unit on the bus are removed to singlephase earth fault in area
Singlephase earth fault outside area should be able to also be handled outside being handled, female operation is closed to adapt to the different buses of same electric substation
When needs.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only 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 and improvements done etc., all should include
Within protection scope of the present invention.
Claims (4)
1. a kind of singlephase earth fault determination methods for transient zero-sequence current, 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
Into step B, otherwise circulation step A；
B, traditional zero sequence current mutual inductor is installed in each feed line leading-out terminal of substation bus bar, its zero-sequence current power frequency component leads to
Cross traditional zero sequence current mutual inductor secondary circuit and deliver to transformer station's detection means, single-phase earthing is judged by the zero sequence current signal
The circuit that failure occurs；
C, faulty line is selected, distribution terminal sends the earth fault with class information to its upper level circuit distribution terminal and closed
Lock signal；
D, by arc suppression coil compensation, the zero-sequence current amplitude between trouble point and transformer station 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.
2. a kind of singlephase earth fault determination methods for transient zero-sequence current according to claim 1, its feature exist
In the method for the transient zero-sequence current amplitude If of each test point on circuit is calculated in the step D is：
<mrow>
<mi>I</mi>
<mi>f</mi>
<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, If is the amplitude of transient zero-sequence current；I0 is transient zero-sequence current values of the test point i in T0.
3. a kind of singlephase earth fault determination methods for transient zero-sequence current according to claim 1, its feature exist
In, when power network region for different electric substations interconnected by circuit hand in hand when, be mainly used in judging that singlephase earth fault is
Occurring in which electric substation, inlet wire zero sequence current mutual inductor is the interconnector inlet wire zero sequence current mutual inductor of the electric substation,
Singlephase earth fault refers to the singlephase earth fault that feeder line occurs in the electric substation, the earth fault processing unit of the electric substation in area
Singlephase earth fault in the electric substation need to only be handled, be not required to the outer electric substation's singlephase earth fault for the treatment of region.
4. a kind of singlephase earth fault determination methods for transient zero-sequence current according to claim 1, its feature exist
In：When the region of power network is the different buses of same electric substation, inlet wire zero sequence current mutual inductor is mother zero sequence current mutual inductor,
Singlephase earth fault refers to the Feeder on a certain bus in area, the earth fault processing dress on the bus
In Zhi Chudui areas singlephase earth fault handled outside singlephase earth fault outside area should be able to also be handled, to adapt to same change
The different buses of electric institute close female needs when running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711205331.9A CN107703423A (en) | 2017-11-27 | 2017-11-27 | A kind of singlephase earth fault determination methods for transient zero-sequence current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711205331.9A CN107703423A (en) | 2017-11-27 | 2017-11-27 | A kind of singlephase earth fault determination methods for transient zero-sequence current |
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| Publication Number | Publication Date |
|---|---|
| CN107703423A true CN107703423A (en) | 2018-02-16 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711205331.9A Withdrawn CN107703423A (en) | 2017-11-27 | 2017-11-27 | A kind of singlephase earth fault determination methods for transient zero-sequence current |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254657A (en) * | 2018-03-28 | 2018-07-06 | 山东大学 | Power distribution network section with low-current ground faults localization method based on Study of Transient Energy |
| CN109901007A (en) * | 2019-03-21 | 2019-06-18 | 国家电网有限公司 | Low current method for locating single-phase ground fault based on Hierarchical Agent intelligent decision |
| CN110275086A (en) * | 2019-07-25 | 2019-09-24 | 国网江苏省电力有限公司淮安供电分公司 | The single-phase grounding selecting method and device of more entry conditions |
| CN114034963A (en) * | 2021-09-27 | 2022-02-11 | 国网青海省电力公司玉树供电公司 | Distribution line single-phase earth fault section identification method based on phase current variable quantity |
-
2017
- 2017-11-27 CN CN201711205331.9A patent/CN107703423A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254657A (en) * | 2018-03-28 | 2018-07-06 | 山东大学 | Power distribution network section with low-current ground faults localization method based on Study of Transient Energy |
| CN108254657B (en) * | 2018-03-28 | 2019-11-26 | 山东大学 | Power distribution network section with low-current ground faults localization method based on Study of Transient Energy |
| CN109901007A (en) * | 2019-03-21 | 2019-06-18 | 国家电网有限公司 | Low current method for locating single-phase ground fault based on Hierarchical Agent intelligent decision |
| CN109901007B (en) * | 2019-03-21 | 2020-12-22 | 国家电网有限公司 | Small current single-phase earth fault positioning method based on layered agent intelligent decision |
| CN110275086A (en) * | 2019-07-25 | 2019-09-24 | 国网江苏省电力有限公司淮安供电分公司 | The single-phase grounding selecting method and device of more entry conditions |
| CN114034963A (en) * | 2021-09-27 | 2022-02-11 | 国网青海省电力公司玉树供电公司 | Distribution line single-phase earth fault section identification method based on phase current variable quantity |
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Application publication date: 20180216 |