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No-load magnetizing inrush current suppression method of YNd11 type three-phase transformer

A three-phase transformer and magnetizing inrush current technology, which is applied to emergency protection circuit devices, electrical components, and circuit devices for limiting overcurrent/overvoltage, and can solve problems such as poor magnetizing inrush current suppression effect and increased operation and maintenance costs. , to achieve the effect of good inhibition and easy access

Active Publication Date: 2017-10-27
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the first two methods need to invest in additional equipment, which increases the cost of operation and maintenance. The third method has parameter setting and control problems, and the suppression effect of excitation inrush current is not good.

Method used

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  • No-load magnetizing inrush current suppression method of YNd11 type three-phase transformer
  • No-load magnetizing inrush current suppression method of YNd11 type three-phase transformer
  • No-load magnetizing inrush current suppression method of YNd11 type three-phase transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Figure 5 To build a simulation model, the transformer in this simulation model is a three-phase double-winding transformer group with a rated voltage of 345 / 289kV, a rated capacity of 1209MVA, and a rated no-load current of about 2A. pass Figure 5 The middle I and V collect the current and voltage waveforms of the primary windings of the transformer, control the switches to open and close at different phase angles of the voltage waveforms, and observe the current waveforms of the primary windings.

[0062] The simulated current and voltage waveforms are as follows: Image 6 with Figure 7 shown by Image 6 It can be seen that the arc extinguishing sequence of the three-phase current is A-C-B, compared with Figure 7 It can be seen that the phase angle of the arc-extinguishing voltage of phase B is

[0063] Therefore, it can be determined that the three-phase closing sequence of the transformer is B-A(C), which can be brought into the formula (9) to obtain the b...

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Abstract

The invention discloses a no-load magnetizing inrush current suppression method of a YNd11 type three-phase transformer. The method comprises the steps that: a protection device samples and records voltage current of a transformer in a transformer steady-state operation process; after a switch-off signal is received, a switch-off time is determined according to three-phase voltage and current information obtained through sampling, and arc extinguishment of B phase current is achieved; an arc extinguishing voltage phase angle is determined according to B phase current arc extinguishing time; and finally a transformer switch-on sequence and a switch-on phase angle are determined according to the above information. According to the method, only the sampling of three-phase voltage and current waveform in the operation of the YNd11 type three-phase transformer to control the final arc extinguishment of the B phase current is needed, at the same time voltage arc extinguishment phase angle information is obtained, thus the switch-on sequence and the switch-on voltage phase angle are determined, thus no-load switch-on magnetizing inrush current can be suppressed, related parameters are easy to obtain, and the method can be conveniently used in practical engineering.

Description

technical field [0001] The invention belongs to the technical field of transformer excitation inrush suppression and relates to a YNd11 type three-phase transformer airdrop excitation inrush suppression method based on phase selection opening and closing. Background technique [0002] The power transformer is one of the core equipment of the power system, and its normal operation is directly related to the continuous and stable operation of the power system. After the transformer is damaged due to a fault, it is difficult to repair and the repair period is long, which will not only affect the normal operation of the power system It may even cause immeasurable economic losses and social impacts. When the transformer is turned on with no load or when the voltage recovers after the external fault is removed, since the magnetic flux of the iron core cannot be mutated, the transient magnetic flux generated by the sudden change of voltage may cause saturation of the iron core, whi...

Claims

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Application Information

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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 郝治国王朵许鸿翔李正圆刘志远李宁于晓军武冰清邹洪森陈瑞宋靖宁安燕杰陈洪建陈昊阳石桂霞
Owner XI AN JIAOTONG UNIV
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