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Transformer excitation surge suppression device

A technology of excitation inrush and suppression devices, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems that the influence of excitation inrush cannot be eliminated, and achieve the effects of saving no-load loss, suppressing three-phase excitation inrush, and purifying harmonic interference

Inactive Publication Date: 2018-09-21
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In actual situations, even if there is a device that can accurately identify the excitation inrush current and ensure that the protection does not malfunction, it cannot eliminate the influence of the excitation inrush current on other aspects

Method used

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  • Transformer excitation surge suppression device
  • Transformer excitation surge suppression device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see figure 2 , the transformer excitation inrush current suppression device consists of a CPU module (1), a memory module (2), an input module (3), a display module (4), an encryption module (5) and a MOSFET module board (6), wherein the The CPU module (1) completes the signal processing and analysis sent by the digital signal processor DSP unit; the memory module (2) adopts a 2-wire industry standard travel interface FRAM; the input module (3) includes a voltage transformer in the receiving system Electrical quantity sensors such as TVs and current transformers, and input devices such as keyboards; the display module (4) adopts a dot matrix liquid crystal display to display the collection and control quantities; the encryption module (5) uses encrypted memory and uses encrypted The algorithm protects the suppressor; the MOSFET module board (6) is made up of a drive circuit and a MOSFET element; the input module (3) is connected to the CPU module (1), and the input qua...

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, and the special features are: the CPU module (1) adopts chip C8051F020; the memory module (2) adopts FM24C512; The secondary side of the device and the current transformer; the display module (4) adopts a liquid crystal module 19264ALCM graphic dot matrix liquid crystal display; the encryption module (5) adopts a CrytoMemory chip with a DES asymmetric encryption algorithm; the MOSFET module board ( 6) Adopt CSD88584Q5DC.

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Abstract

The invention discloses a transformer excitation surge suppression device, which realizes that a current value of a line measured by a current transformer does not change suddenly due to excitation surge caused by no-load input of the transformer when lines in 110kV and above realize longitudinal current differential protection during relay protection of an electric system, and ensures operation correctness of a relay protection device. The excitation surge suppression device is formed by a power supply module, a CPU module, a data storage module, a data display module and an encryption module. The device relates to the technical field of relay protection, electric power system transient stability and power electronic technology and the like. For the problems of maloperation of traditionallongitudinal current differential protection during no-load input of the transformer and loss of accuracy of the relay protection device and the like, by controlling remanent magnetism and no-load input angle of the transformer, three-phase excitation surge is suppressed, and the transformer is allowed to enter steady-state operation smoothly when voltage in the electric system changes suddenly.

Description

technical field [0001] The invention relates to a transformer excitation inrush suppression device, including the overall design of the system and the design of software algorithms. It belongs to the technical fields of power system, relay protection, power electronics and the like. Background technique [0002] The transformer is an important electrical equipment in the power system. When the system fails, the fault current will have a serious impact on the operation of the transformer, and even burn the transformer. Relay protection equipment is the equipment to ensure the safe and stable operation of the power system. Through the use of longitudinal differential protection, the transformer affected by the fault can be quickly and effectively removed in the event of a fault. Due to the structure of the transformer itself, when the transformer is put into the system with no load, a large inrush current will be generated. The appearance of the inrush current will cause wron...

Claims

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Application Information

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IPC IPC(8): H02H7/04
CPCH02H7/04
Inventor 胡海涛
Owner ANHUI UNIV OF SCI & TECH
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