Circuit transformer ferromagnetic resonance preventing device

Abstract

The invention relates to a circuit transformer ferromagnetic resonance preventing device. The device comprises a CPU (central processing unit), an analog acquisition module, a harmonic elimination module, a clock module, a storage module, a liquid crystal display module and a fault recorder module, wherein the output of the signal input analog acquisition module from a transformer assisting secondary winding is connected with the CPU, the resonant data output of the CPU is connected with the storage module, the CPU is connected with a local area network through the fault recorder module and uploads fault data, and the harmonic elimination control signal output of the CPU is connected with the harmonic elimination module. The device can monitor the real-time data of a CVT (capacitor voltage transformer) in real time; for a circuit transformer which needs a harmonic elimination resistor to assist harmonic elimination, after ferromagnetic resonance is judged by a system, the system can put the harmonic elimination resistor with given resistance into the circuit transformer per se; the device is suitable for the circuit transformers with two voltage levels, namely 110kV and 220kV; the device has dual event records; and when the ferromagnetic resonance happens, the circuit transformer ferromagnetic resonance preventing device records the event, and uploads the ferromagnetic resonance data to a background monitor at the same time.

Description

technical field [0001] The invention relates to the field of electric equipment, and relates to a line voltage change anti-ferromagnetic resonance device. Background technique [0002] Line voltage transformer is an important equipment of power system and plays a very important role. The voltage change of the line is mainly used for reclosing, checking the synchronization and checking the no-voltage. Due to various reasons, the line CVT will have ferromagnetic resonance, which will seriously affect the safe and stable operation of the power grid. Therefore, it is necessary to develop a line voltage change anti-ferromagnetic resonance device to improve the safety and reliability of the backbone power grid operation. [0003] Explanation of related terms: [0004] CVT------------------------Capacitive voltage transformer; [0005] Line CVT------------------In the power system, it is installed on the outgoing line side of the substation, and is used for line reclosing, sync...

AI Technical Summary

Problems solved by technology

Since the line CVTs of the substation are all installed and molded products, it is impossible for us as equipment users to change the parameters of their inductance and capacitance, so the first method is not feasible

The second method, changing the neutral point grounding method of the device, is also not feasible

[0012] Moreover, the existing microcomputer resonance elimination devices on the market use printers or built-in EEPROMs to record resonance events, which greatly limits the recording of resonance data. Integrity of event records

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