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Figure. 5.3.1 - 81. Inverse operating time formulas for IEC and IEEE standards.
Non-standard delay characteristics
In addition to the previously mentioned delay characteristics, some functions also have delay
characteristics that deviate from the IEC or IEEE standards. These functions are the following:
• overcurrent stages
• residual overcurrent stages
• directional overcurrent stages
• directional residual overcurrent stages.
The setting parameters and their ranges are documented in the chapters of the respective function
blocks.
Table. 5.3.1 - 47. Inverse operating time formulas for nonstandard characteristics.
RI-type
RD-type
Used to get time grading with
mechanical relays
Mostly used in earth fault protection which grants selective tripping even in non-
directional protection
t = Operating delay (s)
k = Time dial setting
I
m
= Measured maximum current
I
set
= Pick-up setting
t = Operating delay (s)
k = Time dial setting
I
m
= Measured maximum current
I
set
= Pick-up setting
A
AQ
Q-F213
-F213
Instruction manual
Version: 2.04
92
Содержание AQ-F213
Страница 1: ...AQ F213 Feeder protection IED Instruction manual ...
Страница 399: ...Figure 7 4 239 Example block scheme A AQ Q F213 F213 Instruction manual Version 2 04 398 ...
Страница 421: ...Figure 8 14 262 Panel cutout dimensions and device spacing A AQ Q F213 F213 Instruction manual Version 2 04 420 ...