Terminal Temperature Differential Fault Detection
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Solution Overview
Problem
Current fault monitoring systems for device control centers, such as motor control centers, face challenges in accurately detecting connectivity faults due to reliance on temperature measurements which are affected by fluctuations in electrical load and ambient temperature, leading to false alarms and inadequate detection of loose connections that can cause phase-to-phase arc flashes, resulting in potential explosions and significant downtime.
Innovation Solution
A fault monitoring system that uses pairs of temperature sensors to measure the temperature difference between 'IN' and 'OUT' terminals of control sections, calculating and comparing these differences against predetermined thresholds to identify connectivity faults, thereby reducing false alarms and providing accurate fault detection without requiring access to the rear of enclosed conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are used to monitor connectivity faults, then fault detection capability is improved, but false alarms increase due to fluctuations in electrical load and ambient temperature
Solution Approach 1:
The system continuously monitors temperature at multiple points (incoming and outgoing terminals) and compares the temperature differential against predetermined thresholds. This feedback mechanism allows the system to adapt to changing operating conditions while maintaining sensitivity to actual faults, reducing false alarms caused by ambient temperature fluctuations or load changes.
Solution Approach 2:
The patent changes the monitoring parameter from absolute temperature to temperature differential (delta temperature). By measuring the temperature difference between incoming and outgoing terminals rather than absolute temperature values, the system becomes insensitive to ambient temperature changes and electrical load fluctuations, thereby improving measurement precision while maintaining fault detection capability.
2Device complexity
If conventional temperature monitoring is used, then fault detection is simplified, but detection accuracy deteriorates due to inability to distinguish actual faults from environmental variations
Solution Approach 1:
The monitoring system is segmented into multiple measurement points (incoming terminal temperature sensor and outgoing terminal temperature sensor). By dividing the monitoring function into separate measurements at different locations, the system can calculate temperature differentials that accurately reflect connection faults while filtering out environmental variations, thereby improving detection accuracy without significantly increasing overall system complexity.
3Measurement precision
If access to rear of enclosed conductors is required for monitoring, then measurement accuracy is improved, but ease of operation deteriorates due to inability to retrofit existing devices
Solution Approach 1:
The patent extracts the temperature measurement function from the enclosed conductor rear access requirement and relocates it to accessible terminal points. By placing temperature sensors at incoming and outgoing terminals that are accessible from the front or side of control sections, the system achieves accurate connection fault detection without requiring access to enclosed conductors, enabling easy retrofitting to existing devices.
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
The system effectively detects connectivity faults with reduced risk of false alarms, allowing for timely remedial action to prevent phase-to-phase arc flashes and minimize downtime, and can be retrofitted to existing devices, offering vendor-neutral and industry-neutral compatibility.
Implementation Method 1
at least a first pair of temperature sensors, one of the first pair of temperature sensors being adapted to detect the temperature of one of the first pair of terminals
Data Source
AI summary
A fault monitoring system detects connectivity faults in a device control centre. The fault monitoring system includes, for the or each control section, at least a first pair of temperature sensors adapted to detect the temperature of a first pair of terminals (TL1-IN), (TL1-OUT). The system includes a processor configured to receive the detected temperatures, calculate an IN-OUT difference, the IN-OUT difference being a difference between the temperatures of the first pair of terminals (ΔTL1), compare the calculated IN-OUT difference with a predetermined threshold value (ΔT*L1), whereby a calculated difference IN-OUT (ΔTL1), greater than the predetermined threshold value (ΔT*L1), is indicative of a connectivity fault at one of the first pair of terminals, and to generate at least one output signal based on the results of the comparison.