Voltage Detector State Detection for Electrical Protection Appliances
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Solution Overview
Problem
Current methods for detecting the open or closed state of electrical protection appliances in installations require auxiliary contacts and extensive cabling, leading to high implementation costs, safety concerns, and unreliable diagnostics, especially in multi-level installations.
Innovation Solution
A method using upstream and downstream voltage detectors to determine the state of electrical protection appliances without auxiliary contacts, allowing for correlation of voltage data to identify whether the appliance is open, closed, or in an abnormal state, and utilizing current measurements to differentiate between deliberate and accidental openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary contacts and cabling are used to detect the state of protection appliances, then the detection function is achieved, but implementation costs increase and device complexity increases
Solution Approach 1:
The patent extracts the state detection function from the protection appliance itself by using separate voltage detectors positioned upstream and downstream. This eliminates the need for auxiliary contacts on the appliance, removing the cabling complexity while maintaining detection reliability through independent voltage measurement points.
Solution Approach 2:
The patent introduces voltage detectors as intermediary devices that measure voltage at strategic points (upstream and downstream of the protection appliance) without requiring direct connection to the appliance's internal contacts. This mediator approach simplifies the overall system by replacing complex auxiliary contact cabling with simpler voltage measurement points.
2Reliability
If auxiliary contacts are equipped on protection appliances, then state detection is enabled, but manufacturing cost increases
Solution Approach 1:
The state detection functionality is extracted from the protection appliance manufacturing process entirely. Instead of equipping appliances with auxiliary contacts during manufacturing, the system uses separate voltage detectors that can be installed independently, thereby reducing appliance manufacturing costs while maintaining state detection accuracy.
3Loss of information
If extensive cabling is used for auxiliary contacts, then comprehensive state information is obtained, but installation time increases and productivity decreases
Solution Approach 1:
The patent removes the extensive cabling requirement by extracting the detection function to use existing voltage measurement points in the electrical installation. Only simple connections to upstream and downstream voltage points are needed, dramatically reducing installation time while maintaining complete state information through correlation of voltage data from both points.
4Reliability
If auxiliary contacts are cabled extensively, then space in switchboards is occupied, but volume of switchboard increases
Solution Approach 1:
The patent extracts the detection function from the switchboard interior by using voltage detectors connected to upstream and downstream points. This eliminates the need for auxiliary contacts and their associated cabling within the switchboard, reducing the volume required while maintaining detection reliability through external voltage measurement points.
Data Source
AI summary
A method for detecting the open or closed state of a protection appliance in an electrical installation including a voltage detector upstream of the protection appliance and a voltage detector downstream thereof, in which the voltage data provided by the voltage detectors is used to obtain information regarding the presence or absence of voltage upstream and downstream of the protection appliance, a correlation is established between the voltage data, and it is determined whether the protection appliance is in an open state, in a closed state, in an abnormal state or in an undetermined state. The current data provided by the current detectors can also be used to determine the cause of the tripping of the protection appliance, and to thereby obtain a full, precise and real-time diagnostic for the operation of the electrical installation.