Power sourcing equipment and method for detecting insulation resistance at input end of power sourcing equipment
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Solution Overview
Problem
The existing methods for detecting insulation resistance at the input end of power sourcing equipment suffer from reduced accuracy due to the offset in residual current devices (RCDs), leading to potential safety risks and equipment damage.
Innovation Solution
Compensating or canceling the offset of RCDs by using residual current values and voltage parameters obtained from different operating statuses, allowing for improved accuracy in detecting insulation resistance-to-ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If insulation resistance detection is performed using conventional RCD method, then insulation resistance can be detected, but detection accuracy is significantly reduced due to RCD offset
Solution Approach 1:
The patent performs preliminary actions by detecting residual current and voltage parameters at multiple different operating statuses before calculating insulation resistance. This preliminary data collection enables offset compensation by establishing a baseline of system behavior under varying conditions, allowing the calculation to distinguish between actual insulation resistance and RCD offset effects.
Solution Approach 2:
The patent changes operating parameters by detecting residual current and voltage at multiple different operating statuses (different load conditions, different input voltages). This parameter variation allows the system to observe how measurements change with operating conditions, enabling mathematical separation of the RCD offset from the actual insulation resistance value through comparative analysis.
2Duration of action of moving object
If RCD offset is not compensated, then detection process is simple, but false positives occur and operational time is reduced
Solution Approach 1:
The patent implements feedback by continuously monitoring residual current and voltage parameters at multiple operating statuses and using this information to calculate and compensate for RCD offset. The system feeds back the detected parameters into the insulation resistance calculation formula, adjusting the result based on observed variations across different operating conditions, thereby eliminating false positives while maintaining operational continuity.
Data Source
AI summary
A power sourcing equipment includes a residual current detection unit, a voltage detection unit, and a controller. The controller determines an insulation resistance value at the input end of the power sourcing equipment based on a first preset voltage parameter value, a first residual current value, a second preset voltage parameter value, and a second residual current value. The first residual current value is a residual current value of the power sourcing equipment when a voltage parameter of the power sourcing equipment includes the first preset voltage parameter value. The second residual current value is a residual current value of the power sourcing equipment when the voltage parameter of the power sourcing equipment includes the second preset voltage parameter value.