PT protection circuit and control method thereof
A technology for protecting circuits and circuits, which is applied in the field of power transformation, can solve the problems of body burnout, PT fuse blown, and the inability to effectively suppress PT surge currents, etc., to achieve the effect of suppressing surge currents and avoiding PT fuse blowouts
Pending Publication Date: 2022-02-11
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Problems solved by technology
[0004] Based on this, it is necessary that the traditional PT harmonic elimination measures cannot effectively suppress the inrush current of the PT, nor can it realize the suppression of ferromagnetic resonance and low-frequency oscillation at the same time, resulting in the frequent occurrence of PT fuse blown and body burning faults. PT protection circuit and its control method
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[0041] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. A preferred embodiment of the application is shown in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associa...
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The invention relates to a PT protection circuit and a control method thereof, the circuit is connected with a PT neutral point through a first end of a current limiting module, and a second end of the current limiting module is connected with a ground wire; a first end of a switch module is connected with the first end of the current-limiting module, and a second end of the switch module is connected with the second end of the current-limiting module; a first signal detection circuit detects the voltage of the PT neutral point to obtain a voltage signal; a processor acquires and processes the voltage signal, and controls the switch module to be switched off when the voltage value of the voltage signal is greater than a preset threshold value, so that the current limiting module is connected to the circuit, and impact inrush current and zero-sequence voltage drop or disappearance are effectively suppressed; when the voltage value of the voltage signal is lower than a preset threshold value, the switch module is controlled to be closed, so that the circuit system returns to normal; and the impact inrush current of the PT is effectively suppressed, the ferromagnetic resonance and the low-frequency oscillation are suppressed at the same time, and the faults of fusing of the PT fuse wire and burning loss of the body are avoided in all directions.
Description
technical field [0001] The present application relates to the field of power transformation technology, in particular to a PT protection circuit and a control method thereof. Background technique [0002] Ferromagnetic resonance requires certain excitation conditions to make the voltage and current amplitude shift from the normal working state to the resonance state, such as a temporary increase in the power supply voltage and a strong current impact on the system. In the medium-voltage distribution network, due to the nonlinear characteristics of the electromagnetic voltage transformer (hereinafter referred to as PT), external disturbances can easily excite ferromagnetic resonance. When the generators are running in parallel in the power system, the relative swing between the rotors of the generators occurs under the disturbance, and continues to oscillate when there is no damping, which is the main reason for the low-frequency oscillation of the power system. [0003] In ...
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IPC IPC(8): H02H7/04H02H7/05H02H9/00H02H9/02
CPCH02H7/04H02H7/05H02H9/005H02H9/007H02H9/02
Inventor 杨森李光茂周鸿铃乔胜亚朱晨郑服利朱璐占鹏杜钢庞志开王剑韬
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD