CN107390076A - The method that broken string transmission line of electricity is locked using negative sequence voltage - Google Patents
The method that broken string transmission line of electricity is locked using negative sequence voltage Download PDFInfo
- Publication number
- CN107390076A CN107390076A CN201710566291.4A CN201710566291A CN107390076A CN 107390076 A CN107390076 A CN 107390076A CN 201710566291 A CN201710566291 A CN 201710566291A CN 107390076 A CN107390076 A CN 107390076A
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- China
- Prior art keywords
- transmission line
- electricity
- negative sequence
- sequence voltage
- offside
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Classifications
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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
-
- 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
- G01R31/58—Testing of lines, cables or conductors
Abstract
The present invention discloses a kind of method that broken string transmission line of electricity is locked using negative sequence voltage, comprises the following steps：Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are gathered, and is converted into negative-sequence current and negative sequence voltage；Step 2, the offside negative sequence voltage estimated value assumed when transmission line of electricity does not break is calculated, and this negative sequence voltage estimated value is sent to offside；Step 3, this side negative sequence voltage estimated value that offside is sent is received；Step 4, the difference for the negative sequence voltage estimated value that the actual negative sequence voltage in this side and offside are sent is calculated, judges whether the transmission line of electricity breaks.Mutual inductance is not influenceed such a method between by more loop line lines, is improved and is differentiated result precision, contributes to relay protection selectively to cut off disconnection fault.
Description
Technical field
It is more particularly to a kind of to utilize negative sequence voltage locking broken string power transmission line the invention belongs to field of relay protection in power
The method on road.
Background technology
In heavy current grounding system, transmission line of electricity is single-phase or two-phase broken string belongs to disconnected phase state, and it is formed with short circuit
Short circuits are different, belong to open conductors.Although disconnection fault is serious without short trouble, also electric rotating machine and system are transported
Row and relay protection have certain influence.If disconnection fault can not effectively be cut off, circuit will be in non-full-operating state, appearance
Negative phase-sequence, zero-sequence current may cause relay protection of power system to be bypassed the immediate leadership action, cause power failure range to expand.
Abroad in the line protective devices of some producers, the element of circuit breaking monitoring function is configured with.When multistage line
When disconnection fault occurs for a certain bar transmission line of electricity in road, more than one circuit may determine that disconnection fault occurs for system, but single
Pure circuit breaking monitoring function element is but not easy to position the particular location of disconnection fault, and relay protection can not accomplish there is selection
Property cut off faulty line, make power failure range minimum.Therefore, it is necessary to be furtherd investigate to this problem, transmission line of electricity is proposed
The method of discrimination in broken string region.
Chinese Patent Application No. 201611119617.0, December 8 2016 applying date, entitled a kind of relatively zero
The transmission line of electricity broken string area judging method of sequence voltage, the patent is according to circuit side zero-sequence current, residual voltage, if calculating disconnected
The opposite side zero sequence virtual voltage in the circuit does not occur for line, and it is virtual to compare this side zero sequence that this side residual voltage and offside are sent
Voltage, so as to differentiate broken string region.Its weak point is, in more loop transmission circuits, zero-sequence component between by line mutual inductance influenceed
Greatly, easily influence to differentiate result.
The content of the invention
The purpose of the present invention, it is to provide a kind of method for locking broken string transmission line of electricity using negative sequence voltage, not by more times
Mutual inductance influences between line line, improves and differentiates result precision, contributes to relay protection selectively to cut off disconnection fault.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of method that broken string transmission line of electricity is locked using negative sequence voltage, is comprised the following steps：
Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are gathered, and is converted into negative-sequence current and negative sequence voltage；
Step 2, the offside negative sequence voltage estimated value assumed when transmission line of electricity does not break is calculated, and this negative sequence voltage is calculated
Value is sent to offside；
Step 3, this side negative sequence voltage estimated value that offside is sent is received；
Step 4, the difference for the negative sequence voltage estimated value that the actual negative sequence voltage in this side and offside are sent is calculated, judges the power transmission line
Whether break on road.
In above-mentioned steps 1, by this side three-phase current conversion cost side negative-sequence current of transmission line of electricityMethod be：
Wherein,Respectively this side three-phase current of transmission line of electricity.
In above-mentioned steps 1, by this side three-phase voltage conversion cost side negative sequence voltage of transmission line of electricityMethod be：
Wherein,Respectively this side three-phase voltage of transmission line of electricity.
In above-mentioned steps 2, offside negative sequence voltage estimated value is calculated using following formula
Wherein, ZL2For transmission line of electricity negative sequence impedance,For this side negative sequence voltage,For this side negative-sequence current.
In above-mentioned steps 4, this side negative sequence voltage actual value is calculated and the difference of this side negative sequence voltage estimated value that offside is sent,
Judging the method whether transmission line of electricity breaks is：
IfThen judge that the transmission line of electricity breaks；Otherwise, it is determined that the transmission line of electricity does not break；Its
In,For this side negative sequence voltage actual value,This side negative sequence voltage estimated value sent for offside, UsetIt is whole for criterion
Definite value, | | to take amplitude computing.
In transmission line of electricity it has been determined that on the premise of nearby power network has disconnection fault, step 1 is just proceeded by.
After such scheme, the present invention is calculated by comparing the negative sequence voltage that the actual negative sequence voltage in this side and offside are sent
Value, exactly locking occur the transmission line of electricity of disconnection fault, contributed in high voltage power transmisson system, and disconnection fault occurs for locking
Transmission line of electricity, so as to ensure selectively to cut off disconnection fault.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme is described in detail.
As shown in figure 1, the present invention provides a kind of method that broken string transmission line of electricity is locked using negative sequence voltage, in transmission line of electricity
It has been determined that on the premise of nearby power network has disconnection fault, following steps are carried out：
Step 1, this side three-phase current of collection transmission line of electricityThree-phase voltage With
And offside three-phase currentThree-phase voltage
Step 2, circuit both sides three-phase current and three-phase voltage are converted into negative-sequence current and negative sequence voltage respectively：
This side negative-sequence current
This side negative sequence voltage
Offside negative-sequence current
Offside negative sequence voltage
Step 3, the offside negative sequence voltage estimated value assumed when transmission line of electricity does not break is calculated, and this negative sequence voltage is calculated
Value is sent to offside, while receives this side negative sequence voltage estimated value that offside is sent；
With this side negative-sequence current and negative sequence voltage, offside negative sequence voltage estimated value is calculated：
Wherein, ZL2For transmission line of electricity negative sequence impedance,For this side negative sequence voltage,For this side negative-sequence current,
For offside negative sequence voltage estimated value.
With offside negative-sequence current and negative sequence voltage, this side negative sequence voltage estimated value is calculated：
Wherein, ZL2For transmission line of electricity negative sequence impedance,For offside negative sequence voltage,For offside negative-sequence current,
For this side negative sequence voltage estimated value.
Step 4, calculate this side negative sequence voltage actual value and the difference of negative sequence voltage estimated value that offside is sent, judge the transmission of electricity
Whether circuit breaks.
The method of judgement is：Sentence if the difference for the negative sequence voltage estimated value that this side negative sequence voltage actual value and offside are sent is more than
According to setting valve, then judge that disconnection fault occurs for the transmission line of electricity；If the negative phase-sequence electricity that this side negative sequence voltage actual value is sent with offside
The difference of pressure estimated value is not more than criterion setting value, then judges that disconnection fault does not occur for the transmission line of electricity.
IfThen judge that disconnection fault occurs for the transmission line of electricity；Otherwise, it is determined that the transmission line of electricity
Disconnection fault does not occur.
Wherein,For this side negative sequence voltage actual value,The negative sequence voltage estimated value sent for offside, UsetFor
Criterion setting value, | | to take amplitude computing.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (6)
- A kind of 1. method that broken string transmission line of electricity is locked using negative sequence voltage, it is characterised in that comprise the following steps：Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are gathered, and is converted into negative-sequence current and negative sequence voltage；Step 2, the offside negative sequence voltage estimated value assumed when transmission line of electricity does not break is calculated, and this negative sequence voltage estimated value is sent out Give offside；Step 3, this side negative sequence voltage estimated value that offside is sent is received；Step 4, the difference for the negative sequence voltage estimated value that the actual negative sequence voltage in this side and offside are sent is calculated, judges that the transmission line of electricity is No broken string.
- 2. the method for negative sequence voltage locking broken string transmission line of electricity is utilized as claimed in claim 1, it is characterised in that：The step In 1, by this side three-phase current conversion cost side negative-sequence current of transmission line of electricityMethod be：Wherein,Respectively this side three-phase current of transmission line of electricity.
- 3. the method for negative sequence voltage locking broken string transmission line of electricity is utilized as claimed in claim 1, it is characterised in that：The step In 1, by this side three-phase voltage conversion cost side negative sequence voltage of transmission line of electricityMethod be：Wherein,Respectively this side three-phase voltage of transmission line of electricity.
- 4. the method for negative sequence voltage locking broken string transmission line of electricity is utilized as claimed in claim 1, it is characterised in that：The step In 2, offside negative sequence voltage estimated value is calculated using following formula<mrow> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mrow> <mi>n</mi> <mn>2</mn> <mi>t</mi> <mi>u</mi> <mi>i</mi> <mi>s</mi> <mi>u</mi> <mi>a</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <msub> <mover> <mi>U</mi> <mo>&CenterDot;</mo> </mover> <mrow> <mi>m</mi> <mn>2</mn> </mrow> </msub> <mo>-</mo> <msub> <mover> <mi>I</mi> <mo>&CenterDot;</mo> </mover> <mrow> <mi>m</mi> <mn>2</mn> </mrow> </msub> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>2</mn> </mrow> </msub> </mrow>Wherein, ZL2For transmission line of electricity negative sequence impedance,For this side negative sequence voltage,For this side negative-sequence current.
- 5. the method for negative sequence voltage locking broken string transmission line of electricity is utilized as claimed in claim 1, it is characterised in that：The step In 4, this side negative sequence voltage actual value is calculated and the difference of this side negative sequence voltage estimated value that offside is sent, whether judge transmission line of electricity The method of broken string is：IfThen judge that the transmission line of electricity breaks；Otherwise, it is determined that the transmission line of electricity does not break；Wherein,For this side negative sequence voltage actual value,This side negative sequence voltage estimated value sent for offside, UsetFor criterion setting Value, | | to take amplitude computing.
- 6. the method for negative sequence voltage locking broken string transmission line of electricity is utilized as claimed in claim 1, it is characterised in that：In power transmission line On the premise of road is it has been determined that nearby power network has disconnection fault, step 1 is just proceeded by.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710566291.4A CN107390076A (en) | 2017-07-12 | 2017-07-12 | The method that broken string transmission line of electricity is locked using negative sequence voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710566291.4A CN107390076A (en) | 2017-07-12 | 2017-07-12 | The method that broken string transmission line of electricity is locked using negative sequence voltage |
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| CN107390076A true CN107390076A (en) | 2017-11-24 |
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| CN201710566291.4A Withdrawn CN107390076A (en) | 2017-07-12 | 2017-07-12 | The method that broken string transmission line of electricity is locked using negative sequence voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470993A (en) * | 2018-11-07 | 2019-03-15 | 南京国电南自电网自动化有限公司 | A kind of single-phase wire break fault detection method suitable for power distribution network |
| CN110794340A (en) * | 2019-11-13 | 2020-02-14 | 深圳供电局有限公司 | Disconnection protection method and circuit for high-voltage overhead line |
Citations (6)
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| US20080048709A1 (en) * | 2006-07-28 | 2008-02-28 | Hong Woo Lee | Module and method for detecting defect of thin film transistor substrate |
| CN101651329A (en) * | 2008-12-03 | 2010-02-17 | 南京南瑞继保电气有限公司 | Judgment method of line breakage of special TV for inter-turn protection of generator |
| CN102419408A (en) * | 2011-12-31 | 2012-04-18 | 上海交通大学 | System and method for determining single-phase disconnection fault sections based on load monitors |
| CN103063984A (en) * | 2012-12-20 | 2013-04-24 | 北京交通大学 | Power distribution network single-phase earth fault line selection method based on line double-terminal negative sequence current |
| CN106646123A (en) * | 2016-12-08 | 2017-05-10 | 南京南瑞继保电气有限公司 | Zero sequence voltage comparison based off line area judging method for power transmission line |
| CN106771804A (en) * | 2016-12-08 | 2017-05-31 | 南京南瑞继保电气有限公司 | A kind of transmission line of electricity broken string area judging method based on zero-sequence network |
-
2017
- 2017-07-12 CN CN201710566291.4A patent/CN107390076A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080048709A1 (en) * | 2006-07-28 | 2008-02-28 | Hong Woo Lee | Module and method for detecting defect of thin film transistor substrate |
| CN101651329A (en) * | 2008-12-03 | 2010-02-17 | 南京南瑞继保电气有限公司 | Judgment method of line breakage of special TV for inter-turn protection of generator |
| CN102419408A (en) * | 2011-12-31 | 2012-04-18 | 上海交通大学 | System and method for determining single-phase disconnection fault sections based on load monitors |
| CN103063984A (en) * | 2012-12-20 | 2013-04-24 | 北京交通大学 | Power distribution network single-phase earth fault line selection method based on line double-terminal negative sequence current |
| CN106646123A (en) * | 2016-12-08 | 2017-05-10 | 南京南瑞继保电气有限公司 | Zero sequence voltage comparison based off line area judging method for power transmission line |
| CN106771804A (en) * | 2016-12-08 | 2017-05-31 | 南京南瑞继保电气有限公司 | A kind of transmission line of electricity broken string area judging method based on zero-sequence network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109470993A (en) * | 2018-11-07 | 2019-03-15 | 南京国电南自电网自动化有限公司 | A kind of single-phase wire break fault detection method suitable for power distribution network |
| CN110794340A (en) * | 2019-11-13 | 2020-02-14 | 深圳供电局有限公司 | Disconnection protection method and circuit for high-voltage overhead line |
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Application publication date: 20171124 |