ABB RELION 630 Series Technical Manual page 198

Section 5
Supervision functions
192
The function execution requires that at least one of the function
outputs is connected in configuration.
The operation of the station battery supervision function can be described by using a
module diagram. All the modules in the diagram are explained in the next sections.
GUID-800F5217-5187-4686-8C71-EDB4288A849E V1 EN
Figure 125: Functional module diagram
The battery rated voltage is set with the Battery voltage Rtg setting. The value of the
Low battery value and High battery value settings are given in relative per unit to the
Battery voltage Rtg setting.
Level detector 1
The level detector compares the battery voltage U_BATT_IN to the set value of the
Low battery value setting. If the value of U_BATT_IN input drops below the value of
the Low battery value setting, the level detector sends an enabling signal to the timer
1 module.
The measured voltage between the battery terminals U_BATT is available in
monitored data view.
Level detector 2
The level detector compares the battery voltage U_BATT_IN to the set value of the
High battery value setting. If the value of U_BATT_IN exceeds the set value of the
High battery value setting, the level detector sends an enabling signal to the timer 2
module.
Timer 1
Once activated, the timer activates the ST_ULOW output for undervoltage condition.
When the operate timer has reached the value set by the Alarm delay time setting, the
AL_ULOW output is activated. If the voltage returns to normal value before the module
operates, the reset timer is activated. If the reset timer reaches the value set by Reset
delay time, the operate timer resets and the ST_ULOW output is deactivated.
The activation of the BLOCK input resets the timer and deactivates the ST_ULOW and
AL_ULOW outputs. The activation of BLK_ST and BLK_AL blocks the individual
start and alarm outputs respectively.
1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual