CN106646123B - A kind of transmission line of electricity broken string area judging method of relatively residual voltage - Google Patents
A kind of transmission line of electricity broken string area judging method of relatively residual voltage Download PDFInfo
- Publication number
- CN106646123B CN106646123B CN201611119617.0A CN201611119617A CN106646123B CN 106646123 B CN106646123 B CN 106646123B CN 201611119617 A CN201611119617 A CN 201611119617A CN 106646123 B CN106646123 B CN 106646123B
- Authority
- CN
- China
- Prior art keywords
- transmission line
- electricity
- voltage
- residual voltage
- zero
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/088—Aspects of digital computing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of transmission line of electricity broken string area judging method that the present invention discloses relatively residual voltage acquires this side three-phase current of transmission line of electricity and three-phase voltage when judging that power grid has disconnection fault near transmission line of electricity first；Calculate this side zero-sequence current and this side residual voltage；Further according to this side zero-sequence current and this side residual voltage being calculated, if calculating, the opposite side zero sequence virtual voltage in the transmission line of electricity does not occur for broken string, and sends the zero sequence virtual voltage to opposite side, while receiving this side zero sequence virtual voltage that opposite side is sent；Compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string region is differentiated according to criterion.Such method of discrimination facilitates 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, in particular to a kind of transmission line of electricity broken string of relatively residual voltage
Area judging method.
Background technique
In heavy current grounding system, transmission line of electricity is single-phase or two-phase broken string belongs to disconnected phase state, it is formed with short circuit
Short circuits are different, belong to open conductors.Although disconnection fault is serious without short trouble, also rotating electric machine and system are transported
Capable and relay protection has certain influence.If disconnection fault cannot effectively be cut off, route will be in non-full-operating state, appearance
Negative phase-sequence, zero-sequence current may cause relay protection of power system leapfrog movement, and scope of power outage is caused to expand.
In the line protective devices of external certain producers, it is configured with the element of circuit breaking monitoring function.When multistage line
When disconnection fault occurs for a certain transmission line of electricity in road, more than one route may determine that disconnection fault occurs for system, but single
Pure circuit breaking monitoring function element is but not easy to position the specific location of disconnection fault, and relay protection can not accomplish there is selection
Property cut off faulty line, keep scope of power outage 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.
This case is based on the above demand and generates.
Summary of the invention
The purpose of the present invention is to provide a kind of transmission line of electricity broken string area judging method of relatively residual voltage, help
In in heavy current grounding system, relay protection selectively cuts off disconnection fault.
In order to achieve the above objectives, solution of the invention is：
A kind of transmission line of electricity broken string area judging method of relatively residual voltage, includes the following steps：
Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are acquired；
Step 2, this side zero-sequence current and this side residual voltage are calculated；
Step 3, this side zero-sequence current and this side residual voltage being calculated according to step 2, if calculating, broken string does not occur
The opposite side zero sequence virtual voltage in the transmission line of electricity, and the zero sequence virtual voltage is sent to opposite side, while receiving what opposite side was sent
This side zero sequence virtual voltage；
Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string area is differentiated according to criterion
Domain.
In above-mentioned steps 2, this side zero-sequence currentCalculation formula be：
Wherein,Respectively this side three-phase current of transmission line of electricity.
In above-mentioned steps 2, this side residual voltageCalculation formula be：
Wherein,Respectively this side three-phase voltage of transmission line of electricity.
In above-mentioned steps 3, the calculation formula of opposite side zero sequence virtual voltage is：
Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,The opposite side zero sequence virtual voltage calculated for this side.
In above-mentioned steps 4, the content of criterion is：IfThen determine that broken string occurs in the power transmission line
Road；Otherwise, it is determined that broken string is occurred in the transmission line of electricity；Wherein,For this side residual voltage,It is sent for opposite side
This side zero sequence virtual voltage, UsetFor criterion threshold value, | | to take amplitude operation.
If the difference for this side zero sequence virtual voltage that this side residual voltage and opposite side are sent is sentenced no more than criterion threshold value
Fixed broken string is occurred in the transmission line of electricity；If this side residual voltage and the difference for this side zero sequence virtual voltage that opposite side is sent are big
In criterion threshold value, then determine that broken string occurs in the transmission line of electricity.
Before above-mentioned steps 1, first judging transmission line of electricity, nearby whether there is or not disconnection faults for power grid, near transmission line of electricity determines
When power grid has disconnection fault, then carry out step 1.
After adopting the above scheme, this side zero sequence that the present invention is sent by comparing this side residual voltage and opposite side is virtually electric
Pressure accurately differentiates the region that disconnection fault is occurred, facilitates in heavy current grounding system, relay protection is selectively
Cut off disconnection fault.
Detailed description of the invention
Fig. 1 is general flow chart of the invention；
Fig. 2 is specific flow chart of the invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention 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 of relatively residual voltage,
When transmission line of electricity, which determines neighbouring power grid, disconnection fault, following steps are carried out：
Step 1, this side three-phase current of transmission line of electricity is acquiredThree-phase voltageAnd
Opposite side three-phase currentThree-phase voltage
Step 2, the data acquired according to step 1, calculate separately the zero-sequence current and residual voltage of route two sides：
This side zero-sequence current
This side residual voltage
Opposite side zero-sequence current
Opposite side residual voltage
Step 3, this side zero-sequence current and this side residual voltage that transmission line of electricity two sides are calculated according to step 2 respectively,
If calculating, the opposite side zero sequence virtual voltage in the transmission line of electricity does not occur for broken string, and sends the zero sequence virtual voltage to opposite side, together
When receive this side zero sequence virtual voltage for sending of opposite side；
Wherein, by taking this side as an example, the calculation formula of this side zero sequence virtual voltage is：
Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,The opposite side zero sequence virtual voltage calculated for this side.
Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, differentiated according to following criterion disconnected
Line region：If this side zero sequence virtual voltage that this side residual voltage is sent close to opposite side, determining broken string not is occurred at this
Transmission line of electricity；If this side residual voltage keeps off this side zero sequence virtual voltage sent in opposite side, determine that broken string occurs at this
Transmission line of electricity.
That is, ifThen determine that broken string occurs in the transmission line of electricity,
Wherein,For this side zero sequence virtual voltage that opposite side is sent, UsetFor criterion threshold value, | | to take amplitude to transport
It calculates.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (5)
- A kind of area judging method 1. transmission line of electricity of relatively residual voltage breaks, it is characterised in that include the following steps：Step 1, this side three-phase current of transmission line of electricity and three-phase voltage are acquired；Step 2, this side zero-sequence current and this side residual voltage are calculated；Step 3, this side zero-sequence current and this side residual voltage being calculated according to step 2, if calculating, broken string does not occur at this Zero sequence virtual voltage in opposite side when transmission line of electricity, and the zero sequence virtual voltage is sent to opposite side, while receiving this side that opposite side is sent Zero sequence virtual voltage；Step 4, compare this side residual voltage and this side zero sequence virtual voltage that opposite side is sent, broken string region is differentiated according to criterion；In the step 4, the content of criterion is：IfThen determine that broken string occurs in the transmission line of electricity；It is no Then, determining broken string not is occurred in the transmission line of electricity；Wherein,For this side residual voltage,The sheet sent for opposite side Side zero sequence virtual voltage, UsetFor criterion threshold value, | | to take amplitude operation.
- The area judging method 2. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that： In the step 2, this side zero-sequence currentCalculation formula be：Wherein,Respectively this side three-phase current of transmission line of electricity.
- The area judging method 3. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that： In the step 2, this side residual voltageCalculation formula be：Wherein,Respectively this side three-phase voltage of transmission line of electricity.
- The area judging method 4. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that： In the step 3, the calculation formula of opposite side zero sequence virtual voltage is：Wherein, Z1L0For power transmission line zero-sequence impedance,For this side residual voltage,For this side zero-sequence current,For The opposite side zero sequence virtual voltage that this side calculates.
- The area judging method 5. a kind of transmission line of electricity of relatively residual voltage as described in claim 1 breaks, it is characterised in that： Before the step 1, first judge transmission line of electricity nearby power grid whether there is or not disconnection fault, when transmission line of electricity determine power grid nearby have it is disconnected When line failure, then carry out step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611119617.0A CN106646123B (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string area judging method of relatively residual voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611119617.0A CN106646123B (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string area judging method of relatively residual voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106646123A CN106646123A (en) | 2017-05-10 |
| CN106646123B true CN106646123B (en) | 2018-11-23 |
Family
ID=58819128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611119617.0A Active CN106646123B (en) | 2016-12-08 | 2016-12-08 | A kind of transmission line of electricity broken string area judging method of relatively residual voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106646123B (en) |
Families Citing this family (4)
| 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 |
| CN107390076A (en) * | 2017-07-12 | 2017-11-24 | 南京南瑞继保电气有限公司 | The method that broken string transmission line of electricity is locked using negative sequence voltage |
| CN107367669A (en) * | 2017-07-12 | 2017-11-21 | 南京南瑞继保电气有限公司 | The method that broken string transmission line of electricity is locked based on negative sequence network |
| CN110082644B (en) * | 2019-05-23 | 2022-03-15 | 国电南瑞科技股份有限公司 | Relay protection circuit CT disconnection identification method and power transmission line fault location method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02119526A (en) * | 1988-10-27 | 1990-05-07 | Miwa Denki Kk | Earth accident detection for underground transmission line and its detector |
| CN1746690A (en) * | 2005-10-08 | 2006-03-15 | 华北电力大学（北京） | Zero-line and breakage detector of three-phase and four-line system |
| CN102508100A (en) * | 2011-11-04 | 2012-06-20 | 天津市翔晟远电力设备实业有限公司 | Method for judging line fault by using node current subjected to time base synchronization |
| CN103308823A (en) * | 2013-05-23 | 2013-09-18 | 国家电网公司 | Method for locating single-phase disconnection non-ground fault of power distribution network |
| CN104330696A (en) * | 2014-10-15 | 2015-02-04 | 国家电网公司 | Recognition method of line fault partition |
| CN104730410A (en) * | 2015-03-16 | 2015-06-24 | 王金泽 | Distribution line breakage monitoring method and device based on voltage and current vectors |
| CN105762776A (en) * | 2016-04-12 | 2016-07-13 | 中国电力科学研究院 | Electric power line zero sequence protection method |
| CN105807174A (en) * | 2014-12-30 | 2016-07-27 | 施耐德电器工业公司 | Current transformer broken line detection method in power transmission and distribution system protection |
-
2016
- 2016-12-08 CN CN201611119617.0A patent/CN106646123B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02119526A (en) * | 1988-10-27 | 1990-05-07 | Miwa Denki Kk | Earth accident detection for underground transmission line and its detector |
| CN1746690A (en) * | 2005-10-08 | 2006-03-15 | 华北电力大学（北京） | Zero-line and breakage detector of three-phase and four-line system |
| CN102508100A (en) * | 2011-11-04 | 2012-06-20 | 天津市翔晟远电力设备实业有限公司 | Method for judging line fault by using node current subjected to time base synchronization |
| CN103308823A (en) * | 2013-05-23 | 2013-09-18 | 国家电网公司 | Method for locating single-phase disconnection non-ground fault of power distribution network |
| CN104330696A (en) * | 2014-10-15 | 2015-02-04 | 国家电网公司 | Recognition method of line fault partition |
| CN105807174A (en) * | 2014-12-30 | 2016-07-27 | 施耐德电器工业公司 | Current transformer broken line detection method in power transmission and distribution system protection |
| CN104730410A (en) * | 2015-03-16 | 2015-06-24 | 王金泽 | Distribution line breakage monitoring method and device based on voltage and current vectors |
| CN105762776A (en) * | 2016-04-12 | 2016-07-13 | 中国电力科学研究院 | Electric power line zero sequence protection method |
Non-Patent Citations (1)
| Title |
|---|
| 一次110kV线路单相断线故障的继电保护动作分析;阳家书等;《继电器》;20071116;第35卷(第2期);第58-60页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106646123A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106771804B (en) | A kind of transmission line of electricity broken string area judging method based on zero-sequence network | |
| CN106646123B (en) | A kind of transmission line of electricity broken string area judging method of relatively residual voltage | |
| CN104267311B (en) | Phase selection method for faults of double-circuit lines on same tower | |
| CN105337256B (en) | A kind of residual voltage compensating element, blocking method for multiple-circuit on same tower | |
| CN106711965B (en) | A kind of transmission line of electricity broken string method of discrimination based on semaphore transmitting | |
| CN107367669A (en) | The method that broken string transmission line of electricity is locked based on negative sequence network | |
| JP2007116893A (en) | Device and method for detecting fault section by comparison of phase difference, and magnitude of zero-phase current in non-grounded distribution system | |
| CN106602528A (en) | Transmission line breaking area judgment method based on two-side zero-sequence power direction | |
| KR102460706B1 (en) | Apparatus and method detecting direction of fault current | |
| CN106786417B (en) | A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmitting | |
| CN107438929A (en) | Method for being protected in combined power transmission line | |
| CN105738767B (en) | A kind of single-phase transition resistance earth fault phase selection method of partition type power distribution network | |
| CN110635463B (en) | Micro-grid comprehensive protection method based on improved search protection and differential protection | |
| CN103762569B (en) | Analyses for double circuits on same tower two-phase short circuit and ground fault discriminating direction method | |
| Tiwari et al. | Review on protection issues with penetration of distributed generation in distribution system | |
| Biswas et al. | A communication based infeed correction method for distance protection in distribution systems | |
| CN107300657B (en) | Asymmetrical three-phase route single-phase adaptive reclosing property judgment method | |
| CN106501661A (en) | A kind of transmission line of electricity broken string area judging method based on signal transmission | |
| CN103760458B (en) | Analyses for double circuits on same tower single-phase earthing fault direction method of discrimination | |
| CN103972873A (en) | Method for protecting high-voltage DC three-pole power transmission line | |
| CN107390076A (en) | The method that broken string transmission line of electricity is locked using negative sequence voltage | |
| CN105738751A (en) | Setting calculation method for bus differential protection current loop line disconnection alarm fixed value | |
| CN109038513B (en) | A kind of intelligent processing method of the broken string ground connection for failure phase transfer earthing or grounding means | |
| CN108254650A (en) | A kind of quick distinguishing method of substation busbars singlephase earth fault | |
| CN105024366A (en) | Method for preventing false operation of distance III-section protection when power transmission line is overloaded |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |