There are uncertainties in the values of protection operation time, breaker opening time
and protection resetting time. Therefore a safety margin has to be included. With
normal values the needed time difference can be calculated according to equation 345.
40 100 40 40 220t ms ms ms ms msD ³ + + + =
EQUATION1266 V1 EN (Equation 345)
where it is considered that:
the operate time of overcurrent protection B1 is 40 ms
the breaker open time is 100 ms
the resetting time of protection A1 is 40 ms and
the additional margin is 40 ms
3.7.2.3 Setting parameters
Table 89: OC4PTOC (51_67) Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
IBase 1 - 99999 A 1 3000 Base current
Vbase 0.05 - 2000.00 kV 0.05 400.00 Base voltage
AngleRCA 40 - 65 Deg 1 55 Relay characteristic angle (RCA)
AngleROA 40 - 89 Deg 1 80 Relay operation angle (ROA)
NumPhSel 1 out of 3
2 out of 3
3 out of 3
- - 1 out of 3 Number of phases required for phase
selection (1 of 3, 2 of 3, 3 of 3)
DirModeSel1 Disabled
Non-directional
Forward
Reverse
- - Non-directional Directional mode of step 1 (Disabled, Nondir,
Forward, Reverse)
Table continues on next page
1MRK504116-UUS C Section 3
IED application
413
Application manual
To Next Page
Loading...
