CN113013830A - Method for calculating online ice melting distance protection setting impedance of sub-conductor group of transmission line - Google Patents
Method for calculating online ice melting distance protection setting impedance of sub-conductor group of transmission line Download PDFInfo
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- CN113013830A CN113013830A CN202110233646.4A CN202110233646A CN113013830A CN 113013830 A CN113013830 A CN 113013830A CN 202110233646 A CN202110233646 A CN 202110233646A CN 113013830 A CN113013830 A CN 113013830A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/40—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to ratio of voltage and current
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a method for calculating online de-icing distance protection setting impedance of a power transmission line sub-conductor group, which comprises the following steps: uniformly dividing the conductors of the multi-bundle power transmission line of the ice melting line into n groups; calculating unit length equivalent resistance and reactance parameters of the ice melting line grouped sub-conductor group, and calculating to obtain unit length line impedance parameters; calculating the equivalent total length of the grouped online ice melting line to be l1The total impedance of the time line; calculating the equivalent resistance and reactance parameters of the unit length of the residual non-ice-melting line, and calculating to obtain the total equivalent non-ice-melting length l2The total impedance of the line; calculating the total impedance of the line; calculating the line distance protection setting impedance; solves the problem of the prior protection method that the line parameter is causedThe number change causes the problem of line distance protection failure or misoperation.
Description
Technical Field
The invention belongs to the ice melting technology of a power transmission line, and particularly relates to a method for calculating online ice melting distance protection setting impedance of a power transmission line sub-conductor group.
Background
The power transmission line is often easy to form power failure accidents such as line breakage, tower collapse and the like in the ice coating in winter, and further the safety and stability of a power grid and the production and life of people are threatened. At present, the direct current ice melting is implemented on an ice-coated power transmission line in a power system by mainly transferring load and powering off, so that the security and stability threats of ice coating to a main network of the power system are solved to a great extent.
With the intensive research on ice melting technology, the on-line ice melting of sub-conductor groups of the transmission line with the split conductor at high voltage level is also provided by students. The current of the multi-split conductor is transferred to a part of sub-conductors, so that the value of the impedance parameter of the line is remarkably increased, and the false operation or the action rejection of the line distance protection and the like are caused.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method for calculating the online ice melting distance protection setting impedance of the sub-conductor group of the transmission line is provided, and the problem that the line distance protection is refused to operate or is operated mistakenly due to the change of line parameters in the existing protection method is solved.
The technical scheme of the invention is as follows:
a method for calculating online ice melting distance protection setting impedance of a power transmission line sub-conductor group,
it includes:
step 1, uniformly dividing conductors of a multi-split power transmission line of an ice melting line into n groups;
step 2, calculating equivalent resistance R of unit length of grouped sub-conductor groups of ice melting linesuAnd reactance
Parameter XuAnd calculating to obtain a single-bit length line impedance parameter Zu；
Step 3, calculating the equivalent total length of the grouped online ice melting line to be l1Time line total impedance Zice；
Step 4, calculating the equivalent resistance R of the unit length of the residual non-ice-melting linenAnd a reactance parameter Xn，
And calculating to obtain the equivalent non-ice melting total length of l2Total impedance of line Zr；
Step 5, calculating the total impedance Z of the circuit;
and 6, calculating the line distance protection setting impedance.
Step 2, equivalent resistance R of unit length of grouped sub-conductor group of ice melting lineuAnd a reactance parameter XuThe calculation formula of (2) is as follows:
Ru＝n×Rf
Xu＝n×Xf
in the formula: rfAnd XfThe length resistance and reactance parameters of the original split conductor bit are respectively.
The calculation formula of the impedance parameter of the unit length line is as follows:
equivalent total length of l1The calculation formula of the total impedance of the time line is as follows: zice＝Zu·l1。
The total equivalent non-melting ice length is l2The calculation formula of the total impedance of the line is as follows:
step 5, the calculation formula for calculating the total impedance Z of the line is as follows: z ═ Zr+Zice。
The calculation formula of the line distance protection setting impedance is as follows:
Zset＝krelz; in the formula: k is a radical ofrelSetting impedance reliability coefficient for distance protection.
krelAnd taking 0.8-0.85 time of the total length of the protection circuit.
The invention has the beneficial effects that:
the method provides theoretical calculation basis for the distance protection setting impedance calculation of the online ice melting of the sub-conductor grouping of the power transmission line, and further ensures that the distance protection of the power transmission line in the sub-conductor grouping ice melting process can still meet the requirement in the protection range; the problem of line distance protection failure or misoperation caused by line parameter change in the existing protection method is solved.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention provides a distance protection setting impedance calculation method for online deicing of a power transmission line sub-conductor group, which comprises the following specific steps:
1) uniformly dividing the conductors of the multi-bundle power transmission line of the ice melting line into n groups;
2) calculating equivalent resistance R of unit length of grouped sub-conductor groups of ice melting circuitu＝n×RfAnd a reactance parameter Xu＝n×XfWherein R isf，XfRespectively obtaining the bit length resistance and reactance parameters of the original split conductor, and calculating to obtain the impedance parameter of the single-bit length line
3) Calculating the equivalent total length of the grouped online ice melting line to be l1Total impedance of time line
Zice＝Zu·l1；
4) MeterCalculating the equivalent resistance R of the unit length of the residual non-ice-melting linenAnd a reactance parameter XnAnd calculating to obtain the total equivalent non-ice-melting length l2Total impedance of line
5) Calculating the total impedance Z of the line: z ═ Zr+Zice；
6) Determining the line distance protection setting impedance: setting impedance reliability coefficient k according to distance protectionrelIn order to protect the range of 0.8-0.85 times of the total length of the line, k is addedrelMultiplying the total line impedance to obtain a distance protection setting impedance calculated value in the ice melting process of the split conductor
Zset＝krel·Z。
Claims (8)
1. A method for calculating online de-icing distance protection setting impedance of a power transmission line sub-conductor group comprises the following steps:
step 1, uniformly dividing conductors of a multi-split power transmission line of an ice melting line into n groups;
step 2, calculating equivalent resistance R of unit length of grouped sub-conductor groups of ice melting linesuAnd a reactance parameter XuAnd calculating to obtain a single-bit length line impedance parameter Zu；
Step 3, calculating the equivalent total length of the grouped online ice melting line to be l1Time line total impedance Zice；
Step 4, calculating the equivalent resistance R of the unit length of the residual non-ice-melting linenAnd a reactance parameter XnAnd calculating to obtain the total equivalent non-ice-melting length l2Total impedance of line Zr；
Step 5, calculating the total impedance Z of the circuit;
and 6, calculating the line distance protection setting impedance.
2. The method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 1, characterized in that:step 2, equivalent resistance R of unit length of grouped sub-conductor group of ice melting lineuAnd a reactance parameter XuThe calculation formula of (2) is as follows:
Ru＝n×Rf
Xu＝n×Xf
in the formula: rfAnd XfThe length resistance and reactance parameters of the original split conductor bit are respectively.
3. The method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 2, characterized in that: the calculation formula of the impedance parameter of the unit length line is as follows:
4. the method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 1, characterized in that: equivalent total length of l1The calculation formula of the total impedance of the time line is as follows: zice＝Zu·l1。
5. The method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 1, characterized in that: the total equivalent non-melting ice length is l2The calculation formula of the total impedance of the line is as follows:
6. the method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 1, characterized in that: step 5, the calculation formula for calculating the total impedance Z of the line is as follows: z ═ Zr+Zice。
7. The method for calculating the online de-icing distance protection setting impedance of the sub-conductor group of the transmission line according to claim 1, characterized in that: the calculation formula of the line distance protection setting impedance is as follows:
Zset＝krelz; in the formula: k is a radical ofrelSetting impedance reliability coefficient for distance protection.
8. The method for calculating the online de-icing distance protection setting impedance of the sub-conductor grouping of the transmission line according to claim 7, characterized in that: k is a radical ofrelAnd taking 0.8-0.85 time of the total length of the protection circuit.
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Citations (9)
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| US4999639A (en) * | 1989-03-03 | 1991-03-12 | Hazeltine Corporation | Radome having integral heating and impedance matching elements |
| US5710408A (en) * | 1996-08-15 | 1998-01-20 | Msx, Inc. | Automatic controlled for an ice and snow melting system with ground fault circuit interruption |
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
| CN102315615A (en) * | 2011-05-19 | 2012-01-11 | 南方电网科学研究院有限责任公司 | Vehicular DC (Direct Current) ice melting device and protection method thereof |
| CN103050917A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with twelve split sub-conductors by current |
| CN103872657A (en) * | 2014-03-19 | 2014-06-18 | 许继集团有限公司 | Metal loop wire longitudinal differential protection method in parallel-connection ice melting mode |
| RU152260U1 (en) * | 2014-12-23 | 2015-05-10 | Общество с ограниченной ответственностью научно-производственная фирма "Квазар" | HIGH-VOLTAGE RECTIFIER PROTECTING RECTIFIER BY DC COLD FUSION INSTALLATION |
| CN106019054A (en) * | 2016-06-21 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC deicing line single-phase earth fault positioning method |
| CN109038445A (en) * | 2018-08-23 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of electrification deicing topology system and its de-icing method based on step-down capacitor |
-
2021
- 2021-03-03 CN CN202110233646.4A patent/CN113013830B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4999639A (en) * | 1989-03-03 | 1991-03-12 | Hazeltine Corporation | Radome having integral heating and impedance matching elements |
| US5710408A (en) * | 1996-08-15 | 1998-01-20 | Msx, Inc. | Automatic controlled for an ice and snow melting system with ground fault circuit interruption |
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
| CN102315615A (en) * | 2011-05-19 | 2012-01-11 | 南方电网科学研究院有限责任公司 | Vehicular DC (Direct Current) ice melting device and protection method thereof |
| CN103050917A (en) * | 2013-02-16 | 2013-04-17 | 重庆大学 | Intelligent device for circularly melting ice on power transmission line with twelve split sub-conductors by current |
| CN103872657A (en) * | 2014-03-19 | 2014-06-18 | 许继集团有限公司 | Metal loop wire longitudinal differential protection method in parallel-connection ice melting mode |
| RU152260U1 (en) * | 2014-12-23 | 2015-05-10 | Общество с ограниченной ответственностью научно-производственная фирма "Квазар" | HIGH-VOLTAGE RECTIFIER PROTECTING RECTIFIER BY DC COLD FUSION INSTALLATION |
| CN106019054A (en) * | 2016-06-21 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | DC deicing line single-phase earth fault positioning method |
| CN109038445A (en) * | 2018-08-23 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of electrification deicing topology system and its de-icing method based on step-down capacitor |
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