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Figure. 5.4.1 - 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. 5.4.1 - 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-C215
-C215
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00040
95
Содержание AQ-C215
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Страница 297: ...Figure 7 4 179 Example block scheme A AQ Q C215 C215 Instruction manual Version 2 07 Arcteq Relays Ltd IM00040 295 ...
Страница 318: ...Figure 8 14 200 Device installation A AQ Q C215 C215 Instruction manual Version 2 07 316 Arcteq Relays Ltd IM00040 ...
Страница 347: ...10 Ordering information A AQ Q C215 C215 Instruction manual Version 2 07 Arcteq Relays Ltd IM00040 345 ...