5-232
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
DIR POWER 1 CALIBRATION
— This setting allows the relay characteristic angle to change in steps of 0.05°. This is useful
when a small difference in VT and CT angular errors is to be compensated to permit more sensitive settings. This setting
virtually enables calibration of the directional power function in terms of the angular error of applied VTs and CTs. The
element responds to the sum of the
DIR POWER 1 RCA
and
DIR POWER 1 CALIBRATION
settings.
DIR POWER 1 STG1 SMIN
— This setting specifies the minimum power as defined along the relay characteristic angle (RCA)
for the stage 1 of the element. The positive values imply a shift towards the operate region along the RCA line; the negative
values imply a shift towards the restrain region along the RCA line. See the Directional Power Sample Applications figure
for details. Together with the RCA, this setting enables a wide range of operating characteristics. This setting applies to
three-phase power and is entered in per-unit (pu) values. The base quantity is 3 x VT pu base x CT pu base.
For example, a setting of 2% for a 200 MW machine is 0.02
×
200 MW = 4 MW. If 13.8kV is line voltage and 10 kA is a
primary CT current, the source pu quantity is 239 MVA, and thus, SMIN needs to be set at 4 MW / 239 MVA = 0.0167 pu
≈
0.017 pu. If the reverse power application is considered, RCA = 180° and SMIN = 0.017 pu.
The element drops out if the magnitude of the positive-sequence current becomes virtually zero, that is, it drops below the
cutoff level.
DIR POWER 1 STG1 DELAY
— This setting specifies a time delay for stage 1. For reverse power or low forward power
applications for a synchronous machine, stage 1 is typically applied for alarming and stage 2 for tripping.
Figure 5-129: Sensitive directional power logic
5.7.5.3 Underpower (ANSI 37P)
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
POWER
UNDERPOWER
UNDERPOWER 1(2)
UNDERPOWER
UNDERPOWER 1
FUNCTION: Disabled
Range: Enabled, Disabled
UNDERPOWER 1 START
BLOCK DLY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
UNDERPOWER 1 ALARM
PWR PICKUP: 0.50 pu
Range: 0.05 to 2.00 pu in steps of 0.01
UNDERPOWER 1 ALARM
PICKUP DLY: 2.00 s
Range: 0.00 to 600.00 s in steps of 0.01
UNDERPOWER 1 TRIP
PWR PICKUP: 0.50 pu
Range: 0.05 to 2.00 pu in steps of 0.01
Содержание M60
Страница 9: ...TABLE OF CONTENTS M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL ix INDEX ...
Страница 10: ...x M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 14: ...1 4 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL FOR FURTHER ASSISTANCE CHAPTER 1 INTRODUCTION 1 ...
Страница 208: ...4 88 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL FLEXLOGIC DESIGN USING ENGINEER CHAPTER 4 INTERFACES 4 ...
Страница 494: ...5 286 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL CONTROL ELEMENTS CHAPTER 5 SETTINGS 5 Figure 5 158 Time out mode ...
Страница 552: ...5 344 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 596: ...7 14 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 602: ...9 4 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL SATURATION DETECTOR CHAPTER 9 THEORY OF OPERATION 9 ...
Страница 652: ...C 6 M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL COMMAND LINE INTERFACE APPENDIX C COMMAND LINE INTERFACE C ...
Страница 660: ...iv M60 MOTOR PROTECTION SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...