CN106786417A - A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmission - Google Patents
A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmission Download PDFInfo
- Publication number
- CN106786417A CN106786417A CN201611119595.8A CN201611119595A CN106786417A CN 106786417 A CN106786417 A CN 106786417A CN 201611119595 A CN201611119595 A CN 201611119595A CN 106786417 A CN106786417 A CN 106786417A
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- Prior art keywords
- electricity
- transmission line
- current
- phase
- offside
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention discloses a kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmission, comprises the following steps：Step 1, transmission line of electricity offside gathers the side three-phase current and three-phase voltage, and the data is activation that will be gathered is to this side of transmission line of electricity；Step 2, this side of transmission line of electricity gathers the side three-phase current and three-phase voltage；Step 3, this lateral root of transmission line of electricity according to this side and the three-phase current and three-phase voltage of offside, judge both sides whether have certain without stream or be capacitance current；Step 4, if this side is same without flowing or being capacitance current with offside, this mutually breaks to judge transmission line of electricity.This kind of method can help in heavy current grounding system, and relay protection effectively 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 based on electrical quantity transmission breaks
Line method of discrimination.
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 cut off, circuit will 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, but it is such
Element it is excessive depend on definite value, influenceed larger by the ruuning situation of system, be not suitable for the domestic current method of operation, do not meet
Definite value standardization of device etc. is required.
Therefore, it is necessary to be furtherd investigate to this problem, the method for discrimination of transmission line of electricity broken string is proposed.
The content of the invention
The purpose of the present invention, is to provide a kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmission, and it can have
Help in heavy current grounding system, relay protection effectively cuts off disconnection fault.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmission, comprises the following steps：
Step 1, transmission line of electricity offside gathers the side three-phase current and three-phase voltage, and the data is activation that will be gathered extremely is transmitted electricity
This side of circuit；
Step 2, this side of transmission line of electricity gathers the side three-phase current and three-phase voltage；
Step 3, this lateral root of transmission line of electricity judges whether both sides have certain according to this side and the three-phase current and three-phase voltage of offside
Xiang Wuliu is capacitance current；
Step 4, if this side is same without flowing or being capacitance current with offside, this mutually breaks to judge transmission line of electricity.
In above-mentioned steps 3, judge that certain side is with the presence or absence of certain method without stream：If the side phase current has less than circuit
Stream threshold value, then the side this without stream.
In above-mentioned steps 3, judge whether certain side has certain to be for the method for capacitance current：If the side phase current is not less than
Circuit has stream threshold value, and electric current leading voltage close to 90 degree, then the side this mutually be capacitance current.
In above-mentioned steps 1, current transformer and voltage transformer are installed in transmission line of electricity offside, gather the side three-phase current
And three-phase voltage.
In above-mentioned steps 2, current transformer and voltage transformer are installed in this side of transmission line of electricity, gather the side three-phase current
And three-phase voltage.
After such scheme, the present invention uses both sides electrical quantity, is influenceed small by running situation, and relay protection need not
Newly-increased definite value, you can accurate to differentiate whether transmission line of electricity is in broken string state, is primarily adapted for use in circuit both sides and exchanges electrical quantity
Current differential protection.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Specific 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 transmission line of electricity broken string method of discrimination based on electrical quantity transmission, for any
For side, comprise the following steps：
Step 1, by current transformer and voltage transformer on transmission line of electricity, the collection of transmission line of electricity offside is right
Side three-phase currentWith offside three-phase voltageAnd the data is activation that will be gathered extremely is transmitted electricity
This side of circuit；
Step 2, by current transformer and voltage transformer on transmission line of electricity, the collection of this side of transmission line of electricity is originally
Side three-phase currentWith this side three-phase voltage
Step 3, this lateral root of transmission line of electricity judges whether both sides have certain according to this side and the three-phase current and three-phase voltage of offside
Xiang Wuliu is capacitance current；
Wherein, judge both sides is with the presence or absence of certain method without stream：
If this side A phase currents have stream threshold value less than circuit：Then this side A phases are without stream；
If this side B phase currents have stream threshold value less than circuit：Then this side B phases are without stream；
If this side C phase currents have stream threshold value less than circuit：Then this side C phases are without stream；
If offside A phase currents have stream threshold value less than circuit：Then offside A phases are without stream；
If offside B phase currents have stream threshold value less than circuit：Then offside B phases are without stream；
If offside C phase currents have stream threshold value less than circuit：Then offside C phases are without stream；
Wherein,Respectively this side A, B, C phase current magnitude, Respectively
It is offside A, B, C phase current magnitude, IminFor circuit has stream threshold value.
Wherein, whether judge both sides has certain to be for the method for capacitance current：
If this side A phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then A phases in this side are capacitance current；
If this side B phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then B phases in this side are capacitance current；
If this side C phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then C phases in this side are capacitance current；
If offside A phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then offside A phases are capacitance current；
If offside B phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then offside B phases are capacitance current；
If offside C phase currents have stream threshold value not less than circuit：And electric current leading voltage is close to 90 degree：Then offside C phases are capacitance current；
Wherein,Respectively this side A, B, C phase current magnitude, Respectively this side A, B, C phase currents leading voltage angle,Respectively offside A, B, C phases are electric
Stream amplitude,Respectively offside A, B, C phase currents leading voltage angle, IminFor circuit has
Stream threshold value, δ is a less angle, can be set as needed.
Step 4, if this side is same without flowing or being capacitance current with offside, this mutually breaks to judge transmission line of electricity.
Above example is only explanation technological thought of the invention, it is impossible to limit protection scope of the present invention with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. it is a kind of based on electrical quantity transmission transmission line of electricity break method of discrimination, it is characterised in that comprise the following steps：
Step 1, transmission line of electricity offside gathers the side three-phase current and three-phase voltage, and the data is activation that will be gathered is to transmission line of electricity
This side；
Step 2, this side of transmission line of electricity gathers the side three-phase current and three-phase voltage；
Step 3, this lateral root of transmission line of electricity according to this side and the three-phase current and three-phase voltage of offside, judge both sides whether have certain mutually without
Stream is capacitance current；
Step 4, if this side is same without flowing or being capacitance current with offside, this mutually breaks to judge transmission line of electricity.
2. a kind of transmission line of electricity based on electrical quantity transmission as claimed in claim 1 breaks method of discrimination, it is characterised in that：Institute
State in step 3, judge that certain side is with the presence or absence of certain method without stream：If the side phase current has stream threshold value less than circuit,
The side this without stream.
3. a kind of transmission line of electricity based on electrical quantity transmission as claimed in claim 1 breaks method of discrimination, it is characterised in that：Institute
In stating step 3, judge whether certain side has certain to be for the method for capacitance current：If the side phase current has stream threshold not less than circuit
Value, and electric current leading voltage is close to 90 degree, then the side this be mutually capacitance current.
4. a kind of transmission line of electricity based on electrical quantity transmission as claimed in claim 1 breaks method of discrimination, it is characterised in that：Institute
State in step 1, current transformer and voltage transformer are installed in transmission line of electricity offside, gather the side three-phase current and three-phase electricity
Pressure.
5. a kind of transmission line of electricity based on electrical quantity transmission as claimed in claim 1 breaks method of discrimination, it is characterised in that：Institute
State in step 2, current transformer and voltage transformer are installed in this side of transmission line of electricity, gather the side three-phase current and three-phase electricity
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611119595.8A CN106786417B (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmitting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611119595.8A CN106786417B (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmitting |
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| CN106786417A true CN106786417A (en) | 2017-05-31 |
| CN106786417B CN106786417B (en) | 2019-04-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609201A (en) * | 2019-09-25 | 2019-12-24 | 特变电工南京智能电气有限公司 | Line breakage judging method |
| CN110676826A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| CN110880744A (en) * | 2019-12-09 | 2020-03-13 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing voltage amplitude difference of two side lines of line |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
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| CN101741070A (en) * | 2010-01-11 | 2010-06-16 | 山东大学 | Method for pilot protection of circuit based on current capacity and voltage capacity at two ends |
| CN102195277A (en) * | 2011-05-26 | 2011-09-21 | 西安工程大学 | Current differential protection method of transmission line based on fine compensation of capacitance current |
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2016
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| CN101741070A (en) * | 2010-01-11 | 2010-06-16 | 山东大学 | Method for pilot protection of circuit based on current capacity and voltage capacity at two ends |
| CN102195277A (en) * | 2011-05-26 | 2011-09-21 | 西安工程大学 | Current differential protection method of transmission line based on fine compensation of capacitance current |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609201A (en) * | 2019-09-25 | 2019-12-24 | 特变电工南京智能电气有限公司 | Line breakage judging method |
| CN110609201B (en) * | 2019-09-25 | 2022-02-08 | 特变电工南京智能电气有限公司 | Line breakage judging method |
| CN110676826A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| CN110676826B (en) * | 2019-11-28 | 2021-03-23 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| CN110880744A (en) * | 2019-12-09 | 2020-03-13 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing voltage amplitude difference of two side lines of line |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| CN111614065B (en) * | 2020-05-07 | 2022-03-29 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
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| Publication number | Publication date |
|---|---|
| CN106786417B (en) | 2019-04-09 |
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