ABB RED650 Applications Manual

Example how to connect delta connected three-phase
CT set to the IED....................................................................50
Example how to connect single-phase CT to the IED............ 53
Relationships between setting parameter Base Current, CT
rated primary current and minimum pickup of a protection IED.. 55
Setting of voltage channels......................................................... 55
Example................................................................................. 55
Examples how to connect, configure and set VT inputs
for most commonly used VT connections.............................. 56
Examples on how to connect a three phase-to-earth
connected VT to the IED........................................................ 57
Example on how to connect a phase-to-phase
connected VT to the IED........................................................ 59
Example on how to connect an open delta VT to the IED
for high impedance earthed or unearthed networks...............61
Example how to connect the open delta VT to the IED
for low impedance earthed or solidly earthed
power systems....................................................................... 64
Section 5 Local HMI....................................................................... 67
Display..............................................................................................68
LEDs.................................................................................................70
Keypad............................................................................................. 71
Local HMI functionality..................................................................... 73
Protection and alarm indication................................................... 73
Parameter management .............................................................74
Front communication................................................................... 75
Section 6 Differential protection..................................................... 77
Line differential protection................................................................ 77
Identification................................................................................ 77
Application................................................................................... 77
Power transformers in the protected zone............................. 78
Small power transformers in a tap..........................................79
Charging current compensation............................................. 80
Time synchronization............................................................. 82
Communication channels for line differential protection.........82
Configuration of analog signals.............................................. 84
Configuration of output signals...............................................85
Open CT detection................................................................. 85
Setting guidelines........................................................................ 86
General settings..................................................................... 86
Percentage restrained differential operation.......................... 87
The 2nd and 5th harmonic analysis....................................... 91
Internal/external fault discriminator........................................ 92
Table of contents
2 Line differential protection RED650 2.2 IEC
Application manual

ABB RED650 Specifications

General

Brand	ABB
Model	RED650
Category	Protection Device
Language	English