CN113013830B - Power transmission line sub-conductor grouping online ice melting distance protection setting impedance calculation method - Google Patents
Power transmission line sub-conductor grouping online ice melting distance protection setting impedance calculation method Download PDFInfo
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- CN113013830B CN113013830B CN202110233646.4A CN202110233646A CN113013830B CN 113013830 B CN113013830 B CN 113013830B CN 202110233646 A CN202110233646 A CN 202110233646A CN 113013830 B CN113013830 B CN 113013830B
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- ice
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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
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Abstract
The invention discloses a transmission line sub-conductor grouping on-line ice melting distance protection setting impedance calculation method, which comprises the following steps: dividing the multi-split transmission line wires of the ice melting line into n groups; calculating equivalent resistance and reactance parameters of the ice melting line grouping sub-conductor group in unit length, and calculating to obtain line impedance parameters in unit length; calculating the equivalent total length of the grouping online ice melting circuit as l 1 The total impedance of the circuit; calculating equivalent resistance and reactance parameters of the unit length of the residual non-melting ice line, and calculating to obtain the total length of the equivalent non-melting ice as l 2 Total line impedance; calculating the total impedance of the circuit; calculating the line distance protection setting impedance; the method solves the problem that the circuit distance protection refuses or malfunctions due to the change of circuit parameters in the existing protection method.
Description
Technical Field
The invention belongs to the technology of ice melting of a power transmission line, and particularly relates to a power transmission line sub-conductor grouping online ice melting distance protection setting impedance calculation method.
Background
The icing of the transmission line in winter is easy to cause power failure accidents such as line breakage, tower falling and the like of the modeling line, thereby threatening the safety and stability of the power grid and the production and life of people. At present, the power system mainly adopts load transfer and power failure to implement direct-current ice melting on an ice-covered power transmission line, so that the safety and stability threat of ice covering to a main network of the power system are solved to a great extent.
With the deep research of ice melting technology, the implementation of sub-conductor grouping on-line ice melting on a power transmission line with split conductors at a high voltage level is also proposed by students. Since the current of the multi-split conductor is transferred to part of the sub-conductors, the magnitude of the impedance parameter value of the circuit is obviously increased, and thus, the situation of misoperation or refusal of operation of circuit distance protection and the like is caused.
Disclosure of Invention
The invention aims to solve the technical problems: the method for calculating the online ice melting distance protection setting impedance of the transmission line sub-conductor group is provided, so that the problem that the line distance protection is refused or is wrongly operated due to the change of line parameters in the existing protection method is solved.
The technical scheme of the invention is as follows:
a power transmission line sub-conductor grouping on-line ice melting distance protection setting impedance calculation method,
it comprises the following steps:
step 1, equally dividing the multi-split transmission line wires of the ice melting line into n groups;
step 2, calculating equivalent resistance R of unit length of ice melting line grouping sub-conductor group u And reactance
Parameter X u And calculate and get the impedance parameter Z of the unit length line u ；
Step 3, calculating the equivalent total length of the grouping online ice melting circuit as l 1 Total impedance Z of time line ice ；
Step 4, calculating the equivalent resistance R of the unit length of the residual non-ice melting circuit n And reactance parameter X n ，
And calculate the equivalent ice-melting total length to be l 2 Total impedance Z of line r ；
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 ice melting line grouping sub-conductor group u And reactance parameter X u The calculation formula of (2) is as follows:
R u ＝n×R f
X u ＝n×X f
wherein: r is R f And X f The length resistance and reactance parameters of the original split conductor are respectively.
The calculation formula of the impedance parameter of the unit length line is as follows:
the equivalent total length is l 1 The calculation formula of the total impedance of the circuit is as follows: z is Z ice ＝Z u ·l 1 。
The equivalent ice-melting total length is l 2 The calculation formula of the total impedance of the circuit is as follows:
the calculation formula for calculating the total impedance Z of the circuit in the step 5 is as follows: z=z r +Z ice 。
The calculation formula of the line distance protection setting impedance is as follows:
Z set ＝k rel z; wherein: k (k) rel The impedance reliability coefficient is set for distance protection.
k rel Taking 0.8-0.85 times of the whole length of the protection circuit.
The invention has the beneficial effects that:
the invention provides theoretical calculation basis for the calculation of the distance protection setting impedance of the on-line ice melting of the sub-conductor grouping of the transmission line, thereby ensuring that the distance protection of the transmission line in the sub-conductor grouping ice melting process can still be within the protection range; the method solves the problem that the circuit distance protection refuses or malfunctions due to the change of circuit parameters in the existing protection method.
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 on-line ice melting of transmission line sub-conductor groups, which comprises the following specific steps:
1) Dividing the multi-split transmission line wires of the ice melting line into n groups;
2) Calculating equivalent resistance R of unit length of ice melting line grouping sub-conductor group u ＝n×R f And reactance parameter X u ＝n×X f Wherein R is f ，X f The length resistance and reactance parameters of the original split conductor are respectively calculated to obtain the impedance parameters of the line in unit length
3) Calculating the equivalent total length of the grouping online ice melting circuit as l 1 Total impedance of time line
Z ice ＝Z u ·l 1 ；
4) Calculating equivalent resistance R of unit length of residual non-ice melting line n And reactance parameter X n And calculate the equivalent ice-free total length of l 2 Total impedance of line
5) Calculating the total impedance Z of the circuit: z=z r +Z ice ；
6) Determining the line distance protection setting impedance: setting the impedance reliability coefficient k according to distance protection rel To protect the range of 0.8-0.85 times of the whole length of the circuit, k is calculated rel Obtaining a calculated value of distance protection setting impedance in the process of deicing the split conductor by multiplying the total impedance of the line
Z set ＝k rel ·Z。
Claims (5)
1. A transmission line sub-conductor grouping on-line ice melting distance protection setting impedance calculation method comprises the following steps:
step 1, equally dividing the multi-split transmission line wires of the ice melting line into n groups;
step 2, calculating equivalent resistance R of unit length of ice melting line grouping sub-conductor group u And reactance parameter X u And calculate and get the impedance parameter Z of the unit length line u ；
Step 3, calculating the equivalent total length of the grouping online ice melting circuit as l 1 Total impedance Z of time line ice ；
The equivalent total length is l 1 The calculation formula of the total impedance of the circuit is as follows:
Z ice ＝Z u ·l 1 ；
step 4, calculating the equivalent resistance R of the unit length of the residual non-ice melting circuit n And reactance parameter X n And calculate the equivalent ice-free total length of l 2 Total impedance Z of line r ；
The equivalent ice-free total length is l 2 The calculation formula of the total impedance of the circuit is as follows:
step 5, calculating the total impedance Z of the circuit;
the calculation formula of the total impedance Z of the circuit is as follows:
Z＝Z r +Z ice ；
and 6, calculating the line distance protection setting impedance.
2. The method for calculating the online ice melting distance protection setting impedance of the power transmission line sub-conductor group according to claim 1, which is characterized by comprising the following steps of: step 2, equivalent resistance R of unit length of ice melting line grouping sub-conductor group u And reactance parameter X u The calculation formula of (2) is as follows:
R u ＝n×R f
X u ＝n×X f
wherein: r is R f And X f The unit length resistance and reactance parameters of the original split conductor are respectively.
3. The method for calculating the online ice melting distance protection setting impedance of the power transmission line sub-conductor group according to claim 2, which is characterized by comprising the following steps of: the calculation formula of the impedance parameter of the unit length line is as follows:
4. the method for calculating the online ice melting distance protection setting impedance of the power transmission line sub-conductor group according to claim 1, which is characterized by comprising the following steps of: the calculation formula of the line distance protection setting impedance is as follows:
Z set ＝k rel z; wherein: k (k) rel The impedance reliability coefficient is set for distance protection.
5. The method for calculating the online ice melting distance protection setting impedance of the power transmission line sub-conductor group according to claim 4, which is characterized by comprising the following steps: k (k) rel Taking 0.8-0.85 times of the whole length of the protection circuit.
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| US4999639A (en) * | 1989-03-03 | 1991-03-12 | Hazeltine Corporation | Radome having integral heating and impedance matching elements |
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| 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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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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