Technical Data - ABB RET650 Technical Manual

Section 11
Secondary system supervision
11.2.7
256
To protect the trip circuit supervision circuits in the IED, the output
contacts are provided with parallel transient voltage suppressors. The
breakdown voltage of these suppressors is 400 +/– 20 V DC.
Timer
Once activated, the timer runs until the set value tDelay is elapsed. The time
characteristic is according to DT. When the operation timer has reached the maximum
time value, the ALARM output is activated. If a drop-off situation occurs during the
operate time up counting, the reset timer is activated.
The binary input BLOCK can be used to block the function. The activation of the
BLOCK input deactivates the ALARM output and resets the internal timer.

Technical data

Table 177: TCSSCBR Technical data
Function
Operate time delay
Range or value
(0.020 - 300.000) s
1MRK 504 135-UEN A
Accuracy
± 0,5% ± 110 ms
Technical manual