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A large-capacity three-phase combined phase-shifting transformer

A technology for phase-shifting transformers and single-phase transformers, applied in transformers, variable transformers, fixed transformers, etc., can solve the problems of low voltage level of tap changer, high difficulty in fuel tank installation, complicated connection structure, etc. Simple structure and the effect of simplifying the connection structure

Active Publication Date: 2016-08-03
SHANDONG POWER EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the single-core type, the double-core phase-shifting transformer has a complex structure, but its tap changer has a lower voltage level, so it is suitable for occasions with large capacity and high voltage level, but the connection between the series transformer and the two oil tanks of the excitation transformer In the structure, the insulation level of the connection lead is equivalent to that of the line, so the connection structure is relatively complicated, and the installation of the two fuel tanks is also difficult

Method used

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  • A large-capacity three-phase combined phase-shifting transformer
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Examples

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Embodiment 1

[0015] A large-capacity three-phase combined phase-shifting transformer, including three single-phase transformers, which are respectively used as A, B, and C three-phases to form a three-phase transformer. Each single-phase transformer includes a series transformer 1 and an excitation transformer 2. Placed in the same tank and divided into two separate body parts. Such as figure 1 As shown, taking phase A as an example, the series transformer 1 includes a series coil SVA and an excitation coil EVA, leading to four terminals: the first end of the series coil SA and the end LA of the series coil are respectively used as input terminals on the power supply side and output terminals on the load side, and the excitation coil The head end sa of the excitation coil and the end la of the excitation coil lead out to the oil tank. The excitation transformer 2 includes a voltage regulation excitation coil TEVA and a voltage regulation coil TVA. The head end ta of the voltage regulation ...

Embodiment 2

[0017] A large-capacity three-phase combined phase-shifting transformer, such as Figure 4 As shown, current-limiting reactors L1 and L2 are installed at the head end SA of the series coil and the end LA of the series coil to reduce the impact of the short-circuit current in the power grid on the phase-shifting transformer, and the other structures are the same as in the first embodiment.

Embodiment 3

[0019] A large-capacity three-phase combined phase-shifting transformer, such as Figure 5 As shown, due to the large capacity of the phase-shifting transformer, two series coils SVA1 and SVA2 are connected in series, two excitation coils EVA1 and EVA2 are connected in parallel, two voltage regulating excitation coils TEVA1 and TEVA2 are connected in parallel, and two voltage regulating coils TVA1 and TVA2 are connected in series Because the current in the voltage regulating coil is too large, three on-load tap-changers are used in series in the three branches to balance the current distribution in the three branches and limit the short-circuit current that may be generated. The current-limiting reactors L1 and L2 damaged by the switch are the same as the first embodiment in other structures.

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Abstract

The invention relates to a large-capacity three-phase combined phase-shifting transformer, which includes three single-phase transformers, which are respectively used as A, B, and C three-phases to form a three-phase transformer. Each single-phase transformer includes a series transformer and an excitation transformer. They are placed in the same oil tank and divided into two independent body parts. Each phase series transformer includes a series coil and an excitation coil. The excitation transformer includes a voltage regulation excitation coil and a voltage regulation coil. The head end of the voltage regulation excitation coil is connected to the The center taps of the series coils in the series transformer are connected, the end is the neutral point leading to the oil tank, the head end of the voltage regulating coil leads to the oil tank and the angular nodes of the other two excitation coils are connected, and the end is used as the neutral point to lead out to the oil tank. The invention has a simple structure, can not only reduce the voltage level of the tap changer, but also simplify the connection structure between the bodies, reduce the installation difficulty, and has strong practicability in large-capacity and high-voltage level phase-shifting transformers.

Description

technical field [0001] The invention relates to a phase-shifting transformer, in particular to a large-capacity three-phase combined phase-shifting transformer. Background technique [0002] Phase-shifting transformers make the power system run more stably and efficiently by adjusting the phase difference between the input and output voltages. The basic principle of the phase shifting transformer is to generate a voltage between the power supply side and the load side, which has a certain phase angle difference from the power supply side voltage, and the effective value can be adjusted, and superimposed with the power supply side voltage to form the load side voltage , so that there is a phase change between the voltage on the power supply side and the voltage on the load side. Currently commonly used phase-shifting transformers include two basic structures: single-core and double-core. The basic principle of the single-core phase-shifting transformer is to connect a part ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F29/00H01F27/28H01F27/29H01F27/40
CPCH01F27/28H01F27/29H01F27/40H01F29/00H01F2029/143H01F27/42H01F30/12
Inventor 张志强张立国杨同勋
Owner SHANDONG POWER EQUIP