CN106532658A - Pilot direction protection method applicable for half-wavelength power transmission line - Google Patents
Pilot direction protection method applicable for half-wavelength power transmission line Download PDFInfo
- Publication number
- CN106532658A CN106532658A CN201611026219.4A CN201611026219A CN106532658A CN 106532658 A CN106532658 A CN 106532658A CN 201611026219 A CN201611026219 A CN 201611026219A CN 106532658 A CN106532658 A CN 106532658A
- Authority
- CN
- China
- Prior art keywords
- protection
- phase
- failure
- current
- offside
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 230000010354 integration Effects 0.000 claims abstract description 3
- 230000005611 electricity Effects 0.000 claims description 5
- 230000016507 interphase Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—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 for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a pilot direction protection method applicable for a half-wavelength power transmission line. The method comprises the steps of judging a fault direction by means of phase characteristics of power frequency variable quantity of a voltage and a current; respectively acquiring a three-phase voltage and a three-phase current of two sides of a circuit; calculating power frequency variable quantity of phase difference between the voltage and the current after protection is started; calculating a waveform coefficient shown as in specification of a fault phase by taking maximum current integration of quarter cycle wave as the fault phase, wherein N is power frequency data window sampling number, and Zc is wave impedance of the power transmission line; and judging that the fault is a reverse fault when Kf is smaller than 0.20, sending out a reverse shunting signal to protection of an opposite side of the circuit, and judging that the fault is a forward fault by assistance of an interphase abrupt variable direction element and a negative-sequence direction element.
Description
Technical field
The present invention relates to relay protection of power system and automatic field, and in particular to a kind of Unit protection method.
Background technology
Half-wavelength UHV AC transmission technique refers to that transmission distance is close to a power frequency half-wave, i.e. 3000km (50Hz) or 2500km
(60Hz) overlength distance three-phase alternating current technology of transmission of electricity.Relative to other overlength distance technology of transmission of electricitys, half wavelength line has defeated
Send that ability is strong, full line is without the need for advantages such as reactive-load compensations.Half-wave power transmission multi-line power transmission distance is remote, and electric characteristic is extra-high with existing
There is larger difference in line ball road, traditional Principles of Relay Protection cannot meet the requirement of half-wave transmission line road.
Maximum fineness angle of the conventional Unit protection with -80 ° as reverse fault, goes for conventional distance (
As be less than 400km) line protection.But for half-wave power transmission circuit, when length reaches 3000km, the method will
Failure.
The content of the invention
To solve the above-mentioned problems in the prior art, the present invention provides a kind of suitable for the vertical of half-wave power transmission circuit
Connection direction protection method.Technical scheme is as follows：
A kind of Unit protection method suitable for half-wave power transmission circuit, power frequency of the method using voltage and current
The phase property of variable quantity gathers the three-phase voltage and three-phase current of circuit both sides judging the direction of failure, respectively, in protection
After startup, the alternate poor power frequency variation of voltage and current is calculated, and with current integration the maximum of 1/4 cycle as failure phase,
Calculate the form factor of failure phaseN is power frequency data window sampling number, and Zc is transmission line of electricity wave resistance
It is anti-, be judged to reverse fault when Kf is less than 0.20, reverse block signal is sent to the protection of circuit offside, and be aided with alternate mutation
Amount directional element and negative-sequence direction component judge positive failure.
Preferably, alternate sudden-change direction element and negative-sequence direction component judge the method for positive failure as：
(1) protection starts 20ms to 40ms, compares the phase place of failure phase power frequency variation Δ I and Δ U, if meeting 30 °<
Arg(ΔI/ΔU)<150 ° are then judged to positive failure, send positive clearing signal to offside circuit；
(2) after protection starts 40ms, compare the phase place of negative-sequence current I2 and negative sequence voltage U2, if meeting 30 °<Arg(I2/
U2)<150 ° are judged to positive failure, send positive clearing signal to offside circuit；
(3) when meeting, the protection of this side starts, this side is judged to that positive direction, this side receive offside enabling signal, that this side receives is right
During the forward direction clearing signal of side, this side protection act tripping operation；
(4) when this is met, side protection starts, this side is judged to 5ms after positive direction, this side receive offside enabling signal and does not receive
During the reverse block signal of offside, this side protection act tripping operation.
The present invention takes full advantage of the feature of the ratio for wave impedance Zc of voltage and current in reverse fault starting 20ms, and auxiliary
Positive failure is judged with alternate sudden-change direction element and negative-sequence direction component, overcoming traditional Unit protection cannot be suitable for
In the problem of half-wave power transmission route protection.
Description of the drawings
Schematic diagrames of the Fig. 1 for half-wave power transmission circuit longitudinal direction protection method.
Specific embodiment
The present invention is described in further detail with example below in conjunction with the accompanying drawings.
It is illustrated in figure 1 half-wave power transmission conspectus, two equivalent electrical network systems of half-wave power transmission connection M and N
System, the voltage that half wavelength line is connected with M systems is Um, electric current is Im, and the voltage being connected with N sides is Un, electric current is In.
(protect in the same manner N sides) by taking the protection of M sides as an example, the guard method is comprised the following steps：
Step 1：With voltage transformer collection M sides line voltage distribution UA, UB, UC, Current Transformer collection M side electric current IA,
IB、IC.The Secondary Winding of current transformer, voltage transformer is linked in microcomputer protecting device, quilt is obtained by AD collections
The sampled value sequence of sampling electric signal.
Step 2：Using jump-value of current determine protection Startup time, and with Startup time as failure before and after separation,
And calculate power frequency variation Δ UA, Δ UB, Δ UC and Δ IA, Δ IB, Δ IC.Calculate alternate poor power frequency variation Δ UAB, Δ
UBC, Δ UCA and Δ IAB, Δ IBC, Δ ICA.
Step 3：The data window of 1/4 alternate cycle of Δ AB, Δ BC and Δ CA tri- is calculated respectivelyThe maximum
For failure phase.
Step 4：Start the form factor that failure phase is calculated in 20ms in protection.
Wherein, N is power frequency data window sampling number, and Zc is transmission line of electricity wave impedance, and Δ U (k) is voltage variety, Δ I
K () is current change quantity, work as Kf>Reverse fault is judged when 0.20, by protection device from optic fibre data channel to circuit offside N
Send reverse block signal.
Step 5：Protection starts 20ms to 40ms, compares the phase place of failure phase power frequency variation Δ I and Δ U, if meeting 30 °
<Arg(ΔI/ΔU)<150 ° are then judged to positive failure, send positive clearing signal to offside circuit.After protection starts 40ms, than
Compared with negative-sequence current I2 and the phase place of negative sequence voltage U2, if meeting 30 °<Arg(I2/U2)<150 ° are judged to positive failure, to side line
Road sends positive clearing signal.
Step 6：When meeting, the protection of this side starts, this side is judged to positive direction, this side and receives offside enabling signal, this side receive
During offside forward direction clearing signal, this side protection act tripping operation.When this is met, side protection starts, this side is judged to positive direction, this side is received
When to after offside enabling signal, 5ms does not receive offside reverse block signal, this side protection act tripping operation cuts off failure.
Claims (2)
1. a kind of Unit protection method suitable for half-wave power transmission circuit, the method are become using the power frequency of voltage and current
The phase property of change amount gathers the three-phase voltage and three-phase current of circuit both sides judging the direction of failure, respectively, opens in protection
After dynamic, the alternate poor power frequency variation of voltage and current is calculated, and with current integration the maximum of 1/4 cycle as failure phase.Meter
Calculate the form factor of failure phaseN is power frequency data window sampling number, and Zc is transmission line of electricity wave impedance,
Be judged to reverse fault when Kf is less than 0.20, reverse block signal is sent to the protection of circuit offside, and be aided with alternate Sudden Changing Rate
Directional element and negative-sequence direction component judge positive failure.
2. guard method according to claim 1, it is characterised in that alternate sudden-change direction element and negative-sequence direction component
Judge the method for positive failure as：
(1) protection starts 20ms to 40ms, compares the phase place of failure phase power frequency variation Δ I and Δ U, if meeting 30 °<Arg(Δ
I/ΔU)<150 ° are then judged to positive failure, send positive clearing signal to offside circuit；
(2) after protection starts 40ms, compare the phase place of negative-sequence current I2 and negative sequence voltage U2, if meeting 30 °<Arg(I2/U2)<
150 ° are judged to positive failure, send positive clearing signal to offside circuit；
(3) when meeting, the protection of this side starts, this side is judged to positive direction, this side and receives offside enabling signal, this side just receiving offside
During to clearing signal, this side protection act tripping operation；
(4) when this is met, side protection starts, this side is judged to 5ms after positive direction, this side receive offside enabling signal and does not receive offside
Reversely during block signal, this side protection act tripping operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026219.4A CN106532658B (en) | 2016-11-18 | 2016-11-18 | A kind of Unit protection method suitable for half-wave power transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026219.4A CN106532658B (en) | 2016-11-18 | 2016-11-18 | A kind of Unit protection method suitable for half-wave power transmission circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106532658A true CN106532658A (en) | 2017-03-22 |
| CN106532658B CN106532658B (en) | 2018-07-20 |
Family
ID=58352565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611026219.4A Expired - Fee Related CN106532658B (en) | 2016-11-18 | 2016-11-18 | A kind of Unit protection method suitable for half-wave power transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106532658B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482597A (en) * | 2017-08-16 | 2017-12-15 | 南京国电南自电网自动化有限公司 | A kind of half-wave power transmission circuit time difference Unit protection method |
| CN107817402A (en) * | 2017-10-27 | 2018-03-20 | 国网四川省电力公司电力科学研究院 | Direct current transmission line fault direction recognizing method based on measurement wave impedance |
| CN109378806A (en) * | 2018-11-12 | 2019-02-22 | 山东鲁能智能技术有限公司 | A kind of active power distribution network multiple-limb failure judgment method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608498A (en) * | 2012-03-27 | 2012-07-25 | 山东电力集团公司 | Fault phase selection method of new energy transmission line |
| CN105552865A (en) * | 2016-02-03 | 2016-05-04 | 中国电力科学研究院 | Single-side current based free wave energy protection method of half-wavelength circuit |
| CN106026050A (en) * | 2016-07-26 | 2016-10-12 | 许继集团有限公司 | Full-frequency-domain relay protection method and system applicable to ultra-long power transmission line |
-
2016
- 2016-11-18 CN CN201611026219.4A patent/CN106532658B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608498A (en) * | 2012-03-27 | 2012-07-25 | 山东电力集团公司 | Fault phase selection method of new energy transmission line |
| CN105552865A (en) * | 2016-02-03 | 2016-05-04 | 中国电力科学研究院 | Single-side current based free wave energy protection method of half-wavelength circuit |
| CN106026050A (en) * | 2016-07-26 | 2016-10-12 | 许继集团有限公司 | Full-frequency-domain relay protection method and system applicable to ultra-long power transmission line |
Non-Patent Citations (2)
| Title |
|---|
| SHIMIN XUE等: "Main Protection Scheme for UHV Transmission Lines", 《POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC), 2012 ASIA-PACIFIC》 * |
| 刘建辉: "基于分布参数的半波长交流输电线路保护原理研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482597A (en) * | 2017-08-16 | 2017-12-15 | 南京国电南自电网自动化有限公司 | A kind of half-wave power transmission circuit time difference Unit protection method |
| CN107482597B (en) * | 2017-08-16 | 2019-12-10 | 南京国电南自电网自动化有限公司 | Half-wavelength transmission line time difference pilot direction protection method |
| CN107817402A (en) * | 2017-10-27 | 2018-03-20 | 国网四川省电力公司电力科学研究院 | Direct current transmission line fault direction recognizing method based on measurement wave impedance |
| CN109378806A (en) * | 2018-11-12 | 2019-02-22 | 山东鲁能智能技术有限公司 | A kind of active power distribution network multiple-limb failure judgment method and system |
| CN109378806B (en) * | 2018-11-12 | 2019-12-10 | 国网智能科技股份有限公司 | Multi-branch fault determination method and system for active power distribution network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106532658B (en) | 2018-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tumilty et al. | Approaches to network protection for inverter dominated electrical distribution systems | |
| US4082962A (en) | Device for melting the icing by direct current on conductors of overhead power transmission line | |
| CN110970879B (en) | Method and device for controlling valve area ground fault of extra-high voltage direct current low-side converter | |
| CN106532658A (en) | Pilot direction protection method applicable for half-wavelength power transmission line | |
| CN109888744B (en) | Protection method for high-voltage direct-current transmission line | |
| CN105071355B (en) | A kind of differential protecting method of long range extra high voltage direct current transmission line | |
| CN103760465A (en) | Single-phase earth fault direction judgment and processing method of small current grounding system | |
| CN109713648B (en) | Relay protection method for rapidly removing fault of incomplete internal bridge connection dead zone | |
| CN107543998B (en) | Direct-current side fault positioning system and method for multi-terminal flexible direct-current power transmission system | |
| CN107394757B (en) | A kind of preceding fault-free recognition methods of power distribution network phase-to phase fault coincidence | |
| CN110034546B (en) | Short-circuit protection method for low-voltage alternating-current power distribution network with parallel power supply of inverter and generator | |
| CN203688722U (en) | Single-phase grounding fault processing device for small-current grounding system | |
| WO2014190814A1 (en) | Differential protection method for current source converter, and relay protection device | |
| CN103986120B (en) | Transformer differential protection system and method based on magnetic flux brake trap combined judgment | |
| CN102157922B (en) | Reactance relay and re-closing method | |
| CN104218549A (en) | Inter-phase short circuit protecting method for inverter-based distributed generation (IBDG) power distribution network | |
| CN114243659A (en) | High-voltage direct-current transmission line pilot protection based on wave impedance measurement under tuned frequency | |
| JPS6338929B2 (en) | ||
| CN105375447B (en) | A kind of three-phase time sequence of coincidence setting method in reduction ac and dc systems apart from false protection rate | |
| WO2018087603A2 (en) | Method of continuous power supply | |
| CN107894550A (en) | A kind of fault trip method of discrimination suitable for half-wave power transmission circuit stabilization control device | |
| CN106356821B (en) | A kind of half wavelength line guard method based on three reference point Bei Ruilong difference streams | |
| CN111864703B (en) | Device and method for realizing direct-current networking of ship electric propulsion system | |
| CN102830327A (en) | Judging method and device of single-phase grounding fault line of small-current grounding system | |
| CN109031043A (en) | Based on instantaneous power Sudden Changing Rate half-wavelength transmission line of alternation current fault phase-selecting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180720 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |