Variable Warm-Up Delay for Automatic Transfer Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automatic transfer switches have a fixed time delay for warming up the engine-generator before transferring the load, which is unnecessary when the engine-generator is already running, leading to increased downtime and inefficiency.
Innovation Solution
The automatic transfer switch incorporates a controller with timers that adjust the warm-up time based on the engine-generator's running state, allowing for immediate transfer when already running, thereby reducing downtime by bypassing unnecessary delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed warm-up time delay is used before transfer to ensure engine-generator stability, then reliability is improved, but loss of time increases when the engine-generator is already running
Solution Approach 1:
The patent applies dynamics by making the warm-up time delay variable rather than fixed. The controller dynamically adjusts the delay duration based on the engine-generator's operational state: when the engine is already running, the warm-up delay is reduced or eliminated; when the engine is cold, the full warm-up delay is applied. This dynamic adjustment resolves the contradiction by maintaining reliability only when necessary while minimizing time loss when the engine is already operational.
Solution Approach 2:
The patent changes the parameter of warm-up time delay from a constant value to a variable value that depends on engine operational status. The controller monitors engine running state and modifies the delay parameter accordingly, reducing it to zero or a minimal value when the engine is already running, thereby resolving the contradiction between ensuring stability and minimizing downtime.
2Reliability
If a fixed warm-up time delay is applied to allow proper engine warm-up, then reliability is improved, but productivity decreases due to extended downtime
Solution Approach 1:
The system dynamically adjusts the warm-up delay based on real-time engine status. When the engine is already running, the delay is minimized, instantly improving productivity for power restoration. When the engine is cold, the full delay is applied to maintain reliability, thus resolving the contradiction between safety and speed.
Solution Approach 2:
The warm-up time parameter is changed from fixed to variable, allowing the system to optimize between reliability and productivity based on operational conditions. This parameter adaptation enables fast power restoration when the engine is ready while ensuring proper warm-up when needed.
3Reliability
If a long fixed delay is used to ensure engine warm-up, then reliability is improved, but loss of time increases unnecessarily when engine is already operational
Solution Approach 1:
The controller performs preliminary monitoring of the engine's operational state before initiating the transfer sequence. By checking whether the engine is already running in advance, the system can eliminate unnecessary warm-up delays, thus resolving the contradiction between ensuring readiness and avoiding unnecessary delays.
Solution Approach 2:
The warm-up delay parameter is adjusted based on preliminary assessment of engine status. When the engine is already operational, the delay parameter is reduced to zero, eliminating unnecessary time loss while maintaining reliability when the engine requires warm-up.
Data Source
AI summary
An automatic transfer switch includes first and second inputs inputting first and second voltages; a first output outputting a start signal; a first timer timing a first time after the second voltage is available; a second timer delaying for up to a second time before outputting a transfer signal, the second time being reduced by the first time when the second voltage is available; a transfer mechanism selectively electrically connecting one of the inputs to a second output; and a circuit cooperating with the inputs and the transfer mechanism, causing the start signal to be output responsive to the voltages not being available, and causing the transfer mechanism to electrically connect the second input to the second output in response to the transfer signal.