Insulated Drain Discharge Layout to Prevent Ground Faults
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Solution Overview
Problem
The existing electric power apparatuses face the risk of ground faults due to the electrical connection between a drain pan and a grounded drain piping via leaked water, which can occur when the drain pan becomes charged to the main circuit potential and the conductivity of the leaked water deteriorates.
Innovation Solution
A discharge unit is designed with a drain pan, an insulated discharge portion, and a liquid separation part to prevent continuous flow between the discharge portion and the grounded drain piping, utilizing a sufficient height difference and insulation properties in the drain hose and housing to ensure electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drain pan and grounded drain piping are electrically connected via leaked water, then the ground fault risk increases, but the simplicity of the drainage system is maintained
Solution Approach 1:
The drainage system is segmented into multiple insulation barriers: the discharge portion is electrically isolated from the drain pan, and the liquid separation part creates a discontinuous liquid path. This segmentation prevents electrical connection between the drain pan and grounded drain piping even when leakage occurs, resolving the ground fault risk without requiring complex additional components.
Solution Approach 2:
The liquid separation part acts as an intermediary element that interrupts the continuous liquid path between the discharge portion and drain piping. By preventing continuous liquid flow, it breaks the electrical conduction path that would otherwise connect the high-potential drain pan to the grounded piping, thereby preventing ground faults while maintaining system simplicity.
2Ease of operation
If the drain pan becomes charged to main circuit potential, then the cooling unit operation is maintained, but the ground fault risk increases
Solution Approach 1:
The harmful electrical connection path is extracted and removed from the system by implementing electrical insulation at the discharge portion and creating a liquid flow interruption at the liquid separation part. This allows the drain pan to operate at main circuit potential for cooling purposes while the extracted insulation barriers prevent the harmful ground fault condition.
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 configuration effectively prevents ground faults by ensuring that the drain pan and drain piping remain electrically isolated, even when the drain pan is at the main circuit potential, thereby safeguarding the electrical device from potential ground faults caused by leaked water.
Implementation Method 1
a discharge portion (14) having an insulation property... a liquid separation part (15) having an insulation property
Data Source
AI summary
A discharge unit of an embodiment includes a drain pan, a discharge portion having an insulation property, a grounded drain piping, and a liquid separation part having an insulation property. The drain pan receives a liquid. The discharge portion is connected to the drain pan and drains the liquid remaining in the drain pan. The liquid separation part prevents the liquid from flowing continuously between the discharge portion and the drain piping.