Power Control Unit Failure Detection
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Solution Overview
Problem
Existing power and control units for low or medium voltage apparatuses fail to effectively detect failures in both the connection and the apparatus itself, leading to high power dissipation and interoperability issues with trip circuit supervision functions, and require gold-plated contacts.
Innovation Solution
A power and control unit with a binary input, control unit, failure and continuity detection unit, and enabling unit that allows for selective activation of the detection functionality, using a low impedance load connected in parallel to the binary input via a switch, enabling detection of failures and reducing power dissipation, and enabling the use of standard switch contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power resistor is connected in parallel to the binary input, then the trip circuit supervision function can be implemented, but high power is generated that must be dissipated inside the power and control electronic device
Solution Approach 1:
The patent applies dynamics by making the resistor connection configurable rather than fixed. The control unit can dynamically enable or disable the parallel resistor connection based on operational mode, allowing the system to adapt between supervision mode (resistor connected) and normal operation mode (resistor disconnected), thus resolving the contradiction between supervision reliability and power dissipation
Solution Approach 2:
The patent implements periodic action by using pulsed or intermittent activation of the parallel resistor connection. Instead of continuous connection causing constant power dissipation, the resistor is activated only during specific supervision periods or diagnostic phases, reducing overall energy loss while maintaining supervision capability
2Loss of energy
If the resistor value is kept as high as possible to reduce power consumption and thermal heating, then power dissipation is reduced, but interoperability problems arise with the trip circuit supervision function of some relays
Solution Approach 1:
The patent applies parameter changes by making the resistor value configurable rather than fixed. Different resistor values can be selected based on the specific relay supervision function requirements, allowing optimization of power consumption for each application while ensuring proper interoperability. The control unit can adjust the resistor parameter to match the characteristics of different relay types
Solution Approach 2:
The system dynamically adjusts resistor parameters based on detection requirements and relay characteristics. The control unit can modify the resistor value or connection state in real-time to achieve both low power consumption and compatibility with various relay supervision functions, resolving the contradiction between energy efficiency and adaptability
Data Source
AI summary
A power and control unit for low or medium voltage applications operatively coupable to a low or medium voltage apparatus and to a protection relay having a trip circuit supervision. The power and control unit for low or medium voltage applications according to the invention comprises:a binary input which is operatively coupable with said protection relay;a control unit operatively coupled to said binary input and operatively coupable to said low or medium voltage apparatus;a failure and continuity detection unit operatively coupled to said binary input and that can be enabled and disabled;an enabling unit operatively coupled to said failure and continuity detection unit and to said control unit and operatively coupable to said low or medium voltage apparatus.