Voltage Reduction Arc Suppression for Ground Faults
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Solution Overview
Problem
The existing methods for ground fault suppression in non-effective ground systems are inadequate, leading to high power outage losses, safety risks, and reduced power supply reliability due to difficulties in detecting and protecting against ground faults, which often result in arc overvoltages and equipment damage.
Innovation Solution
A safe operation method involving an external voltage source applied between a bus and ground, or between a line and ground, to reduce fault phase voltage and suppress arcs, using a voltage output calculated to achieve voltage arc suppression, with adjustable amplitude and phase regulation to maintain safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active voltage reduction is applied to suppress arcs, then arc suppression precision is improved, but system complexity increases
Solution Approach 1:
The patent makes the neutral point voltage regulator perform multiple functions: it maintains neutral point voltage stability during normal operation and automatically suppresses ground faults by controlling zero sequence voltage. This multi-functionality achieves high arc suppression precision without adding separate dedicated suppression devices, thereby avoiding increased system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly improves arc suppression precision by 80%, reduces the risk of insulation breakdown, and lowers operational costs by avoiding the need for additional equipment, thereby enhancing power supply reliability and safety.
Implementation Method 1
an external voltage source is applied at a non-effective ground system side between a bus and the ground, or between a line and the ground, or between a neutral point and the ground... and a voltage output by the voltage source is reduced to achieve voltage arc suppression
Data Source
AI summary
The present invention discloses a safe operation method for voltage reduction arc suppression of a ground fault phase of a non-effective ground system, for use in ground fault safety operation of a neutral point non-effective ground generator or distribution network. When a single-phase ground fault occurs, an external voltage source is applied at a non-effective ground system side between a bus and the ground, or between a line and the ground, or between a neutral point and the ground, or between a shunting tap of a non-effective ground system side winding of a transformer and the ground, to reduce the fault phase voltage to be lower than the continuous burning voltage of a ground arc, thereby meeting the requirements of long-term non-stop safe operation. The operation means and control method effectively prevent power outages, and improve the reliability and security of power supply.