Alstom SHPM 101 - Page 274

SERVICE MANUAL R5888B
QUADRAMHO Chapter 5
Addendum 2
Page 8 of 13
SCHEME TESTS TO BE DONE FOR SELECTED SCHEME
ZONE 1 EXTENSION SCHEME (08 or 09)
Loop impedances required are K15 x the Zone 1 requirements in the main table.
Phase faults
Required Nominal Test Set – Source Impedance =
reach ZR loop
impedance Fault Test set Actual loop Nominal
required impedance CT ratio impedance %
with 100% set
Zone 1
extension
Fault Actual Relay Relay Equivalent %
type % volts amps Z ohms Error
A – B
B – C
C – A
Ground Faults
Required Nominal Test Set – Source Impedance =
reach ZR loop
impedance Fault Test set Actual loop Nominal
required impedance CT ratio impedance %
with 100% set
Zone 1
extension
Fault Actual Relay Relay Equivalent %
type % volts amps Z ohms Error
A – G
B – G
C – G