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ANSI / IEEE Protection Curves
“IEEE (The Institute of Electrical and Electronics Engineers, Inc.) C37.112
-2006: IEEE Standard Inverse-Time
Characteristic Equations for Overcurrent Relays -
Description”
standard describes the protection curves named
as below.
1.
IEEE MI: IEEE Moderately Inverse Curve.
2.
IEEE VI: IEEE Very Inverse Curve.
3.
IEEE EI: IEEE Extremely Inverse Curve.
𝒕 = [
𝑨
(
𝑰
𝑰
𝑺
)
𝜶
− 𝟏
+ 𝑩] × 𝑻𝑴𝑺
Universal trip time delay formula is given above, while ANSI / IEEE constants for various curves are given on the
below table.
t
Trip delay (s).
A
A constant for the characteristic (s).
I
Momentary current (A).
Is
Set current threshold (A).
α
A constant for the characteristic (-).
B
A constant for the characteristic (s).
TMS
Time Multiplier Setting (-).
□
Curve Type
Trip Delay Formula
Reset Delay Setting Range
ANSI / IEEE MI
Moderately Inverse
𝒕 =
[
𝟎. 𝟎𝟓𝟏𝟓 𝒔
(
𝑰
𝑰
𝑺
)
𝟎.𝟎𝟐
− 𝟏
+ 𝟎. 𝟏𝟏𝟒 𝒔
]
× 𝑻𝑴𝑺
𝑫𝑴𝑻 (𝟎. 𝟎𝟒 − 𝟏𝟎𝟎) 𝒔
or
𝑹𝑻𝑴𝑺 (𝟎. 𝟎𝟐𝟓 − 𝟑. 𝟐)
ANSI / IEEE VI
Very Inverse
𝒕 =
[
𝟏𝟗. 𝟔𝟏 𝒔
(
𝑰
𝑰
𝑺
)
𝟐
− 𝟏
+ 𝟎. 𝟒𝟗𝟏 𝒔
]
× 𝑻𝑴𝑺
𝑫𝑴𝑻 (𝟎. 𝟎𝟒 − 𝟏𝟎𝟎) 𝒔
or
𝑹𝑻𝑴𝑺 (𝟎. 𝟎𝟐𝟓 − 𝟑. 𝟐)
ANSI / IEEE EI
Extremely Inverse
𝒕 =
[
𝟐𝟖. 𝟐 𝒔
(
𝑰
𝑰
𝑺
)
𝟐
− 𝟏
+ 𝟎. 𝟏𝟐𝟏𝟕 𝒔
]
× 𝑻𝑴𝑺
𝑫𝑴𝑻 (𝟎. 𝟎𝟒 − 𝟏𝟎𝟎) 𝒔
or
𝑹𝑻𝑴𝑺 (𝟎. 𝟎𝟐𝟓 − 𝟑. 𝟐)
Содержание CPM 310 G
Страница 1: ...CPM 310 G Digital Overcurrent Protection Relay User Application Manual vEN 2016 03...
Страница 2: ...2...
Страница 6: ...6 ABOUT DEMA...
Страница 11: ...11 INTRODUCTION...
Страница 32: ...32 PACKING LABELING INFORMATION...
Страница 34: ...34 OPERATING MANUAL...
Страница 53: ...53 RELAY MENUS MANUAL...
Страница 55: ...55 The Menu Tree...
Страница 56: ...56...
Страница 57: ...57...
Страница 58: ...58...
Страница 59: ...59...
Страница 60: ...60...
Страница 61: ...61...
Страница 128: ...128 DIGICONNECT PC PROGRAM MANUAL...
Страница 189: ...189 APPLICATION DIAGRAMS...
Страница 191: ...191 Sample Power Transformer Protection Application Diagram...
Страница 193: ...193 FUNDAMENTAL CABLING DIAGRAM...
Страница 195: ...195 APPLICATION DIAGRAM NO 2 Function Function Activation Address Output Settings Internal Error Alarm Automatic...
Страница 203: ...203 APPLICATION DIAGRAM NO 10 RS485 Cabling...
Страница 204: ...204 TECHNICAL DATA...
Страница 220: ...220 GLOSSARY...