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Switch-on voltage amplitude control based excitation surge suppression system and method of transformer

A technology of voltage amplitude and excitation inrush current, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve problems such as changing the system structure, and achieve suppression of excitation inrush current generation, The effect of ensuring flexibility

Active Publication Date: 2016-08-17
SHANDONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

This type of method needs to change the system structure, and can only suppress the inrush current to a certain extent

Method used

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  • Switch-on voltage amplitude control based excitation surge suppression system and method of transformer
  • Switch-on voltage amplitude control based excitation surge suppression system and method of transformer
  • Switch-on voltage amplitude control based excitation surge suppression system and method of transformer

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing and example the present invention will be further described:

[0051] A transformer excitation inrush current suppression system based on closing voltage amplitude control, such as figure 1 As shown, it includes a closing voltage amplitude control system, the closing voltage amplitude control system is respectively connected to the power supply system and the transformer through a switch, and the power supply system is directly connected to the transformer through a switch;

[0052] The closing voltage amplitude control system includes:

[0053]Residual magnetism estimation module: used to monitor the residual magnetism in the iron core before the transformer is switched on, including the size and direction of the residual magnetism; and transmit the residual magnetism data to the control module of the closing voltage amplitude function;

[0054] Control parameter setting module: used to change the artificially set control...

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Abstract

The invention discloses a switch-on voltage amplitude control based excitation surge suppression system and method of a transformer. The method comprises the following steps of detecting residual magnetism; setting a parameter; generating a control function, and calculating the parameter of the control function; and connecting a system power supply and a primary side of the transformer by a switch-on voltage amplitude control system, changing a voltage amplitude input to the transformer according to the control function, completing the control of switching off the switch-on voltage amplitude control system, and directly switching on the power supply and the primary side of the transformer. The method has the advantages that the size of the excitation surge during the no-load switch-on process of the transformer can be accurately controlled and cannot exceed saturated magnetic flux borne by a transformer iron core, so that the purpose of preventing excitation surge is achieved; the excitation surge can be fundamentally suppressed, and the influence of the excitation surge on devices such as the transformer and a transformer protection device can be effectively prevented; and the control function is allowed to be selected and set, and the flexibility of a control scheme and the adaptability to different types of transformers can be ensured.

Description

technical field [0001] The invention belongs to power system transformer protection technology, in particular to a transformer excitation inrush suppression system and method based on closing voltage amplitude control. Background technique [0002] The power transformer is an important equipment in the power system. When the transformer is closed with no load, the external fault is removed, or the power supply side is overvoltage, due to the inductive characteristics of the transformer, a large excitation inrush current will be generated. In severe cases, it can reach 60% of the rated current of the transformer. to eight times. A large inrush current will increase the heat generation of the transformer core and affect the service life of the transformer; it will generate a large number of harmonics and affect the power quality; it will also cause the relay protection device to malfunction, affecting the safe and reliable operation of the power grid. Among them, the excitati...

Claims

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Application Information

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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 丛伟王伟旭盖午阳张子衿康奇豹肖洪王慧
Owner SHANDONG UNIV
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