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Apparatus and method for inhibiting transformer zero load closing inrush currents

A technology of exciting inrush current and no-load closing, applied in the field of transformers, can solve problems such as complex control, and achieve the effect of reliable control method, simple circuit, and suppression of exciting inrush current

Active Publication Date: 2014-09-10
扬州京隆科技有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a device and method for suppressing the excitation inrush current of transformer no-load closing in view of the defect of complex control of the existing methods for solving transformer no-load closing excitation inrush current

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  • Apparatus and method for inhibiting transformer zero load closing inrush currents
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  • Apparatus and method for inhibiting transformer zero load closing inrush currents

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] see figure 1 , is a circuit diagram of a device for suppressing no-load closing excitation inrush current of a transformer according to a preferred embodiment of the present invention. like figure 1 As shown, the primary winding side of the transformer 30 applicable to the present invention is connected to the AC power source J1, that is, the power grid side through the main switch K1, and the secondary winding side of the transformer 30 is connected to the power supply network J2. The device provided by the present invention for suppressing the excitation inrush current of transformer no-load closing includes a control module 20 and a bypass circuit 10 connected in parallel with the main switch K1 between the AC power source J1 and the tra...

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Abstract

The invention relates to an apparatus and method for inhibiting transformer zero load closing inrush currents. The apparatus comprises a control module and a bypass circuit which is connected between an AC source and a transformer and is connected with a main switch in parallel. The control module is used for acquiring power network voltages at the front end of the main switch after a closing instruction is received, emitting a signal to conduct the A-phase line of the bypass circuit when A-phase voltages reach a zero-crossing 90-degree phase angle, and sending a signal to conduct the B-phase line and the C-phase line of the bypass circuit successively when the A-phase voltages delay 60 degrees and 120 degrees. According to the invention, the bypass circuit carries out closing when the voltages reach the zero-crossing 90-degree phase angle, such that the instantaneous value of magnetic flux is zero during the closing, and the purpose of inhibiting inrush currents generated during transformer zero load closing is achieved. The circuit is simple, and the control method is reliable.

Description

technical field [0001] The invention relates to the technical field of transformers, more specifically, to a device and method for suppressing no-load closing excitation inrush current of transformers. Background technique [0002] When the power transformer is turned on without load, due to the randomness of the closing time, a large excitation inrush current will be generated. Exciting inrush current often causes malfunction of microcomputer protection devices. Exciting inrush current with a large value will affect the service life of transformers and circuit breakers due to electrodynamic force. A large number of harmonics in inrush current will cause serious pollution to the power quality of the grid, resulting in grid voltage Sudden rises or dips affect the normal operation of other electrical equipment. There are series resistors and controlling the closing phase angle to solve the transformer no-load closing excitation inrush current, but the method of series resista...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04
Inventor 沈文江马骏张利雪卫利
Owner 扬州京隆科技有限公司
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