Resonance overvoltage eliminating device based on current-sensitive element state monitoring

Abstract

A resonance overvoltage eliminating device based on current-sensitive element state monitoring comprises a monitor module, a primary resonance eliminator, a secondary resonance eliminating device and an effect evaluation module. The monitor module comprises a parameter determination unit, a state evaluation unit and an early warning unit; a current transformer is arranged in the primary resonance eliminator, and the secondary resonance eliminating device comprises a control unit, a resonance eliminating unit and a display unit. According to the device, an on-line monitoring technique and a resonance eliminating technique are combined to achieve advantage complementary, the efficiency is improved to a greatest extent, and safe and stable operation of equipment is guaranteed.

Description

technical field [0001] The invention relates to the field of resonance eliminators, in particular to a resonance overvoltage elimination device based on the ability to monitor the state of current sensitive elements. Background technique [0002] Most power grids below 35kV in my country adopt the power supply neutral point ungrounded operation mode. The primary winding of the electromagnetic voltage transformer on the grid bus becomes the only metal channel for the neutral point ungrounded grid to the ground. through the primary winding of the voltage transformer. When a single-phase ground fault occurs in the power grid, the capacitor current will flow through the fault point, and the voltage of the sound phase will rise to the line voltage, and its ground capacitance will be charged with a charge corresponding to the line voltage. Once the ground fault disappears, the current path is cut off, and the non-grounded phase must be restored from the line voltage to the normal ...

AI Technical Summary

Problems solved by technology

In terms of eliminating resonance, there is a hysteresis phenomenon, and long-term use alone will cause damage to the voltage transformer

The primary resonance eliminator is mainly a pressure-sensitive element resonance eliminator. When the PT is in normal operation, the pressure-sensitive impedance is extremely large, which affects the measurement accuracy of the PT; Due to heat dissipation requirements, thermal breakdown will occur; since the pressure sensitive element is installed in the seal, the operating status cannot be monitored in real time during long-term use

With the development needs of the national smart grid, especially the implementation and application of online monitoring, the harmonic eliminators of the above technical standards can no longer meet the production needs

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