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Gallop eliminating and ice melting transformer design method considering wide voltage regulation and fine and adjustable current

A transformer and wide voltage regulation technology, which is applied in the field of deicing and melting transformer design, can solve the problems of lack of line parameter change adaptability, design results that are difficult to achieve optimal, and the number of transformer gears is too large, etc., to achieve excellent design results, Avoid the effect of trial and error and small number of gears

Active Publication Date: 2021-04-09
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, the selection of each gear corresponding to the secondary side voltage lacks overall planning, that is, generally only the needs of a certain line are considered without considering the needs of multiple lines, which often leads to the design of a large number of transformer gears and a lack of Adaptability to changes in line parameters, the design results are difficult to achieve optimal

Method used

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  • Gallop eliminating and ice melting transformer design method considering wide voltage regulation and fine and adjustable current
  • Gallop eliminating and ice melting transformer design method considering wide voltage regulation and fine and adjustable current
  • Gallop eliminating and ice melting transformer design method considering wide voltage regulation and fine and adjustable current

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Embodiment 1

[0021] This embodiment discloses a design method of an ice-melting transformer that takes into account a wide voltage regulation range and can finely adjust the ice-melting current, such as figure 1 shown, including the following steps:

[0022] Step S1. Determine the rated current of the secondary side of the transformer according to the maximum value of the deicing and melting reference currents of all wires to be deiced.

[0023] Step S2 , calculating the highest and lowest DC voltages required by the DC ice melting device according to the deicing and melting reference current, the maximum ice melting current and the resistance parameters of all wires of the lines to be melted.

[0024] Step S3. Determine the number of transformer gears according to the ratio between the highest ice-melting DC voltage and the lowest ice-melting DC voltage.

[0025] Step S4, according to the current equivalent of the rectifier series-parallel connection and the combination mode of the ice-m...

Embodiment 2

[0072] Corresponding to Embodiment 1, this embodiment further describes the present invention in detail in conjunction with a specific design case.

[0073] 1.1) Summarize all the ice-melting circuits applicable to this set of deicing and melting devices, as well as the line type and resistance parameters of each circuit. For a fixed DC deicing device, the line types and parameters of all icing lines in the substation are shown in Table 2.

[0074] Table 2

[0075] line number Voltage (kV) Wire type Length (km) Resistance R l (Ω)

Inductive reactanceX l (Ω)

1# 220 LGJ-300 / 40 10.6 1.00 4.35 2# 220 JLHA1-400 51 3.67 20.45 3# 220 LGJ-400 / 35 56.053 4.04 22.48 4# 110 LGJ-300 / 40 12.18 1.14 4.99 5# 110 LGJ-240 / 30 9.375 1.23 3.76 6# 110 LGJ-240 / 30 44.515 5.83 17.85 7# 110 LGJ-240 / 30 3.5 0.46 1.40 8# 110 LGJ-240 / 30 16.684 2.19 6.69 9# 110 LGJ-240 / 30 22.757 2.98 9.13 ...

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Abstract

The invention relates to the technical field of electrical engineering, and discloses a gallop eliminating and ice melting transformer design method considering wide voltage regulation and fine and adjustable current. The method comprises the following steps: determining the rated current of a secondary side of the transformer according to the maximum value in gallop eliminating and ice melting reference current of all to-be-ice-melted line conductors; according to the gallop eliminating and ice melting reference current, the maximum ice melting current and the resistance parameters of all the to-be-ice-melted line conductors, calculating the highest ice-melting direct-current voltage and the lowest ice-melting direct-current voltage required by a direct-current ice melting device; determining the number of gears of the transformer according to the ratio of the highest ice-melting direct-current voltage to the lowest ice-melting direct-current voltage; designing the output voltage of each gear of the ice melting transformer according to the fact that the current in the rectifier series-parallel connection and ice melting mode combined mode is equivalent to the current of different transformer gears in the rectifier series connection and ice melting mode two-phase series connection mode. Therefore, the ice melting currents corresponding to different gears are not crossed and overlapped, and the equivalent output voltages of different gears are not crossed and overlapped.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a design method for a dance-dispelling and ice-melting transformer that takes into account both wide voltage regulation and finely adjustable current. Background technique [0002] Transmission lines are prone to icing in winter due to rain, snow and freezing weather. Ice-covered transmission lines are prone to galloping under the action of strong winds. Galloping may lead to large-scale collapse of towers, disconnection and major blackouts, seriously affecting the safe and stable operation of the power grid. A large number of galloping lines cross important passages such as railways and expressways. Damage to the lines caused by galloping can easily cause high-speed rail and high-speed outages, seriously affecting normal social order. [0003] The three factors that stimulate conductor galloping are conductor icing, wind excitation, line structure and parameters. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/02H02G7/16H02G7/14
CPCH02G1/02H02G7/16H02G7/14
Inventor 黄清军李波谭艳军朱思国朱远毛新果
Owner STATE GRID HUNAN ELECTRIC POWER
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