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RIDMT: Inverse Definite Time Reset Curves
RIDMT curves are used to obtain the inverse D.M.T. resetting characteristics for IEEE/ANSI and
custom curves that are needed to provide selectivity schemes when electromechanical relays are
protecting a primary line in series with the one CPM 311 protects. The RIDMT parameters differ with
the tripping curve they are based on. The table
CPM 311 Protection and Reset Curves Parameters
on
page 16 shows these parameters. The sample image below shows the CO2 short time inverse trip
characteristic and its RIDMT curve. The formula given below explains the calculation method of the
reset delay for CO2 RIDMT curve.
□
𝒕 =
[
𝟔. 𝟗 𝒔
𝟏 − (
𝑰
𝑰
𝑺
)
𝟐
]
× 𝑹𝑻𝑴𝑺
Sample IDMT formula: CO2 IDMT Reset Curve Formula
Please check the table on page 16 for other IDMT formulas.
Содержание CPM 311
Страница 1: ......
Страница 9: ... 9 INTRODUCTION ...
Страница 31: ... 31 PACKING LABELING INFORMATION ...
Страница 33: ... 33 OPERATING MANUAL ...
Страница 49: ... 49 RELAY MENUS MANUAL ...
Страница 51: ... 51 The Menu Tree ...
Страница 52: ... 52 ...
Страница 53: ... 53 ...
Страница 54: ... 54 ...
Страница 55: ... 55 ...
Страница 56: ... 56 ...
Страница 57: ... 57 ...
Страница 124: ... 124 DIGICONNECT PC PROGRAM MANUAL ...
Страница 181: ... 181 APPLICATION DIAGRAMS ...
Страница 183: ... 183 Sample Power Transformer Protection Application Diagram ...
Страница 185: ... 185 FUNDAMENTAL CABLING DIAGRAM ...
Страница 187: ... 187 APPLICATION DIAGRAM NO 2 Function Function Activation Address Output Settings Internal Error Alarm Automatic ...
Страница 195: ... 195 APPLICATION DIAGRAM NO 10 Function Function Activation Address RS485 Connection Settings ...
Страница 196: ... 196 TECHNICAL DATA ...
Страница 208: ... 208 GLOSSARY ...