GE D30 series - Page 7

GE Multilin D30 Line Distance Protection System vii
TABLE OF CONTENTS
8.2.2 SECURITY MENU ............................................................................................. 8-6
9. THEORY OF OPERATION 9.1 DISTANCE ELEMENTS
9.1.1 INTRODUCTION................................................................................................ 9-1
9.1.2 PHASOR ESTIMATION ..................................................................................... 9-1
9.1.3 DISTANCE CHARACTERISTICS ...................................................................... 9-2
9.1.4 MEMORY POLARIZATION................................................................................ 9-6
9.1.5 DISTANCE ELEMENTS ANALYSIS .................................................................. 9-7
9.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
9.2.1 DESCRIPTION................................................................................................. 9-11
9.2.2 EXAMPLE ........................................................................................................ 9-14
9.3 GROUND DIRECTIONAL OVERCURRENT
9.3.1 DESCRIPTION................................................................................................. 9-16
9.3.2 EXAMPLE ........................................................................................................ 9-16
9.4 SERIES COMPENSATED LINES
9.4.1 DESCRIPTION................................................................................................. 9-18
9.5 FAULT LOCATOR
9.5.1 FAULT TYPE DETERMINATION..................................................................... 9-21
10. APPLICATION OF
SETTINGS
10.1 APPLICATION GUIDELINES
10.1.1 INTRODUCTION.............................................................................................. 10-1
10.1.2 IMPACT OF MEMORY POLARIZATION ......................................................... 10-1
10.1.3 HIGH SET OVERCURRENT ELEMENTS ....................................................... 10-1
10.2 DISTANCE ELEMENTS (STEPPED DISTANCE SCHEME)
10.2.1 PHASE DISTANCE.......................................................................................... 10-2
10.2.2 GROUND DISTANCE ...................................................................................... 10-3
10.3 SERIES COMPENSATED LINES
10.3.1 INTRODUCTION.............................................................................................. 10-6
10.3.2 DISTANCE ....................................................................................................... 10-6
10.3.3 GROUND DIRECTIONAL OVERCURRENT ................................................... 10-7
10.3.4 HIGH-SET PHASE OVERCURRENT .............................................................. 10-7
10.4 PHASE DISTANCE THROUGH POWER TRANSFORMERS
10.4.1 PHASE DISTANCE PROTECTION ................................................................. 10-8
10.4.2 EXAMPLE ........................................................................................................ 10-9
A. FLEXANALOG AND
FLEXINTEGER
PARAMETERS
A.1 PARAMETER LISTS
A.1.1 FLEXANALOG ITEMS .......................................................................................A-1
A.1.2 FLEXINTEGER ITEMS ....................................................................................A-10
B. MODBUS
COMMUNICATIONS
B.1 MODBUS RTU PROTOCOL
B.1.1 INTRODUCTION................................................................................................B-1
B.1.2 PHYSICAL LAYER.............................................................................................B-1
B.1.3 DATA LINK LAYER............................................................................................B-1
B.1.4 CRC-16 ALGORITHM........................................................................................B-2
B.2 MODBUS FUNCTION CODES
B.2.1 SUPPORTED FUNCTION CODES ...................................................................B-3
B.2.2 READ ACTUAL VALUES OR SETTINGS (FUNCTION CODE 03/04H) ...........B-3
B.2.3 EXECUTE OPERATION (FUNCTION CODE 05H) ...........................................B-4
B.2.4 STORE SINGLE SETTING (FUNCTION CODE 06H) .......................................B-4
B.2.5 STORE MULTIPLE SETTINGS (FUNCTION CODE 10H) ................................B-5
B.2.6 EXCEPTION RESPONSES ...............................................................................B-5