Version: 2020-09-04
194
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Thermal Runaway
For this configuration step, navigate to the following menu:
A "Thermal Runaway" is one of the most dangerous events that can happen when using battery systems:
The battery overheats. This incident leads into trouble with unpredictable effects:
Overheated batteries can expel explosive, corrosive, or oxygen-displacing gases, catch fire, explode as well as damaging neighboring
batteries. Furthermore, battery caused fire also contains toxic and unpredictable mixture of chemicals, whose combustion gases, in
addition to special extinguishing agents, make special protective clothing indispensable.
For this reason, some countries all around the world require in case of clear signs for a beginning thermal runaway, the batteries can be
completely separated from the UPS or the battery charging system.
How to configure a thermal runaway
For this step, the following pre-conditions are mandatory:
1. The number of batteries is configured
2. The number of battery strings is configured
3. Ideally, the strings are named
4. All BACS modules are registered, found and BACS is initialized and running.
5. Battery breaker are installed
6. GX_R_AUX are installed and ready to use
Open the tab „Thermal Runaway “:
At first, define the condition a BACS Webmanager shall assume a Thermal Runaway:
* Additional options based on the configuration and hardware-level of your BACS system
Max. Module Temperature Difference
Problems usually indicates in dramatic temperature increasments of individual batteries. The BACS Webmanager therefore measures
the temperature of the individual batteries on each module.
This results in a basic statistical value from which individual batteries can deviate.
If boundary conditions are met, there is a clear indication of a thermal runaway. Depending on the hardware constellation, the protection
circuitry physically disconnects affected string or all batteries from UPS / battery charger.
Max Current per String
Optionally, an additional conspicuousness can be included in the thermal runaway detection as soon as each string can use its own
current sensor. Via the current sensor, a deviation of individual strings in relation to other strings can be measured:
Ideally, the strings are evenly loaded and unloaded. Irregularities and short-term deviations are familiar phenomenons when dealing
with batteries, large and long-term deviations are an indication of a broken battery, endangered for leading into a thermal runaway...
Above Conditions Are True Since
This feature defines timer that must be expired before the BACS Webmanager considers a thermal runaway is proven. Among other
things, this feature can be used to calculate local peculiarities and roughly predictable environmental influences.
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