CN106501661A - A kind of transmission line of electricity broken string area judging method based on signal transmission - Google Patents
A kind of transmission line of electricity broken string area judging method based on signal transmission Download PDFInfo
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- CN106501661A CN106501661A CN201611119548.3A CN201611119548A CN106501661A CN 106501661 A CN106501661 A CN 106501661A CN 201611119548 A CN201611119548 A CN 201611119548A CN 106501661 A CN106501661 A CN 106501661A
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- transmission line
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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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Abstract
The present invention discloses a kind of transmission line of electricity broken string area judging method based on signal transmission, comprises the steps：Step 1, transmission line of electricity both sides gather the side three-phase current and three-phase voltage respectively, and calculate the side homopolar power, judge the side zero sequence power direction；Step 2, if certain side zero sequence power direction is positive direction, sends homopolar power positive direction signal to opposite side；Step 3, after opposite side receives homopolar power positive direction signal, judges whether opposite side zero sequence power direction is positive direction, if so, then judges that broken string occurs in the transmission line of electricity.This kind of method is can help in heavy current grounding system, and relay protection selectively cuts off disconnection fault.
Description
Technical field
The invention belongs to field of relay protection in power, more particularly to a kind of transmission line of electricity broken string based on signal transmission
Area judging method.
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 impact.If disconnection fault effectively can not cut off, circuit will in non-full-operating state, appearance
Negative phase-sequence, zero-sequence current may cause relay protection of power system to bypass 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 in road, a certain bar transmission line of electricity occurs disconnection fault, more than one circuit may determine that system occurs disconnection fault, but single
Pure circuit breaking monitoring function element is but not easy the particular location for positioning disconnection fault, and relay protection cannot accomplish there is selection
Property ground cut off faulty line, make power failure range minimum.Therefore, it is necessary to further investigate to this problem, transmission line of electricity is proposed
The method of discrimination in broken string region.
Content of the invention
The purpose of the present invention, is to provide a kind of transmission line of electricity broken string area judging method based on signal transmission, and which can
Contribute in heavy current grounding system, relay protection selectively cuts off disconnection fault.
In order to reach above-mentioned purpose, the solution of the present invention is：
A kind of transmission line of electricity broken string area judging method based on signal transmission, comprises the steps：
Step 1, transmission line of electricity both sides gather the side three-phase current and three-phase voltage respectively, and calculate the side homopolar power,
Judge the side zero sequence power direction；
Step 2, if certain side zero sequence power direction is positive direction, sends homopolar power positive direction signal to opposite side；
Step 3, after opposite side receives homopolar power positive direction signal, judges whether opposite side zero sequence power direction is just
Direction, if so, then judges that broken string occurs in the transmission line of electricity.
In above-mentioned steps 1, the computational methods of homopolar power are：
Zero-sequence current and residual voltage are calculated first：
Zero-sequence current：
Residual voltage：
This side homopolar power is calculated again：
Wherein,Respectively three-phase current,Respectively three-phase voltage.
In above-mentioned steps 1, transmission line of electricity side judges that the method for zero sequence power direction is：When transmission line of electricity side zero sequence work(
When rate is less than homopolar power positive direction threshold value, judge the side zero sequence power direction for positive direction.
In above-mentioned steps 1, current transformer is respectively mounted in transmission line of electricity both sides, for gathering the side three-phase current.
In above-mentioned steps 1, voltage transformer is respectively mounted in transmission line of electricity both sides, for gathering the side three-phase voltage.
Before above-mentioned steps 1, first judge nearby electrical network whether there is disconnection fault to transmission line of electricity, near transmission line of electricity is determined
When electrical network has disconnection fault, then carry out step 1.
After using such scheme, the present invention monitors signal with reference to the broken string that this side electric parameters and opposite side are sent, by system
Ruuning situation affects little, and relay protection is without the need for newly-increased definite value, you can accurately differentiate whether transmission line of electricity is in broken string state, mainly
It is applied to the pilot protection that circuit both sides exchange semaphore.
Description of the drawings
Fig. 1 is the general flow chart of the present invention；
Fig. 2 is the particular flow sheet of the present invention.
Specific embodiment
Below with reference to accompanying drawing, technical scheme is described in detail.
As depicted in figs. 1 and 2, the present invention provides a kind of transmission line of electricity broken string area judging method based on signal transmission,
For any side, comprise the steps：
Step 1, by current transformer and voltage transformer installed in transmission line of electricity both sides, this side of collection transmission line of electricity
Three-phase currentWith this side three-phase voltageAnd this side homopolar power is calculated, judge zero sequence work(
Rate direction；
This side zero-sequence current is calculated first：
Calculate this side residual voltage：
This side homopolar power is calculated again：
Wherein, the method for judging this side zero sequence power direction is：
If this side homopolar power is less than homopolar power positive direction threshold value：P0<P0set, then this side zero sequence power direction is square
To；
Wherein, P0setFor homopolar power positive direction threshold value.
Step 2, if this side zero sequence power direction is positive direction, sends homopolar power positive direction signal to offside；
Step 3, after offside receives the homopolar power positive direction signal that this side sends, judges that offside zero sequence power direction is
No for positive direction, if so, then judge that broken string occurs in the transmission line of electricity.
Above example technological thought only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, every
According to technological thought proposed by the present invention, any change that is done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (6)
1. a kind of transmission line of electricity broken string area judging method based on signal transmission, it is characterised in that comprise the steps：
Step 1, transmission line of electricity both sides gather the side three-phase current and three-phase voltage respectively, and calculate the side homopolar power, judge
The side zero sequence power direction；
Step 2, if certain side zero sequence power direction is positive direction, sends homopolar power positive direction signal to opposite side；
Step 3, after opposite side receives homopolar power positive direction signal, judges whether opposite side zero sequence power direction is square
To if so, then judgement broken string occurs in the transmission line of electricity.
2. a kind of transmission line of electricity broken string area judging method based on signal transmission as claimed in claim 1, it is characterised in that：
In the step 1, the computational methods of homopolar power are：
Zero-sequence current and residual voltage are calculated first：
Zero-sequence current：
Residual voltage：
This side homopolar power is calculated again：
Wherein,Respectively three-phase current,Respectively three-phase voltage.
3. a kind of transmission line of electricity broken string area judging method based on signal transmission as claimed in claim 1, it is characterised in that：
In the step 1, transmission line of electricity side judges that the method for zero sequence power direction is：When transmission line of electricity side homopolar power is less than zero
During sequence power positive direction threshold value, judge the side zero sequence power direction for positive direction.
4. a kind of transmission line of electricity broken string area judging method based on signal transmission as claimed in claim 1, it is characterised in that：
In the step 1, current transformer is respectively mounted in transmission line of electricity both sides, for gathering the side three-phase current.
5. a kind of transmission line of electricity broken string area judging method based on signal transmission as claimed in claim 1, it is characterised in that：
In the step 1, voltage transformer is respectively mounted in transmission line of electricity both sides, for gathering the side three-phase voltage.
6. a kind of transmission line of electricity broken string area judging method based on signal transmission as claimed in claim 1, it is characterised in that：
Before the step 1, first judge nearby electrical network whether there is disconnection fault to transmission line of electricity, when transmission line of electricity determine electrical network nearby have disconnected
During line failure, then carry out step 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611119548.3A CN106501661A (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string area judging method based on signal transmission |
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| CN201611119548.3A CN106501661A (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string area judging method based on signal transmission |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394755A (en) * | 2017-06-30 | 2017-11-24 | 南京南瑞继保电气有限公司 | A kind of guard method for avoiding the unordered action of transmission line of electricity broken string |
| CN108521116A (en) * | 2018-03-07 | 2018-09-11 | 中国电力科学研究院有限公司 | A kind of method and system for transmission line of electricity longitudinal direction failure to be identified |
| CN110632440A (en) * | 2019-09-29 | 2019-12-31 | 上海思源弘瑞自动化有限公司 | Transformer fault judgment method and device based on zero and negative sequence power directions |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394755A (en) * | 2017-06-30 | 2017-11-24 | 南京南瑞继保电气有限公司 | A kind of guard method for avoiding the unordered action of transmission line of electricity broken string |
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| CN110632440A (en) * | 2019-09-29 | 2019-12-31 | 上海思源弘瑞自动化有限公司 | Transformer fault judgment method and device based on zero and negative sequence power directions |
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Application publication date: 20170315 |