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HEATING 1P 2P 3P
ELEMENTS
IN SERIES FOR STAR CONNECTION DELTA CONNECTION STAR CONNECTION
EACH STRAND WITHOUT CONNECTED WITH CONNECTED
NEUTRAL CONDUCTOR NEUTRAL CONDUCTOR
6 10% – – 10%
5 13% 10% – 13%
4 17% 10% 10% 17%
3 25% 14% 13% 25%
2 50% 25% 26% 50%
TAB. 3 PARTIAL SHORT-CIRCUIT WITH HEATING ELEMENTS SWITCHED IN SERIES, OVERCUR-
RENT, RELATIVE MONITORING
AGEING OF LOAD RESISTORS
Thyro-P determines the load conductance separately for each phase. These values are available
from LBA, Thyro-Tool Familiy and the Bus interface. The current resistance can be determined by
reading out and converting from the conductance.
The following table offers an overview of the possible monitoring functions of the Thyristor Power
Controller Thyro-P.
TYPE OF PARAMETER DEFAULT /
MONITORING SETTINGS REMARKS
U
net max
mains overvoltage input in volts Type voltage + 20%
U
net min
mains undervoltage input in volts Type voltage - 20%
I
load max-REL
overcurrent 0-100% REL_ABS = REL
overcurrent relative Re: measured load current UE_S = ON
after each RESET/control lock
I
load max-ABS
overcurrent input in ampere REL_ABS = ABS
absolute UE_S = ON
I
load min-REL
undercurrent 0 to 99% REL_ABS = REL
relative Re: measured load current UN_S = ON
after each RESET/control lock
I
load min-ABS
undercurrent input in ampere REL_ABS = ABS
absolute UN_S = ON
pulse switch pulse switch off ON: pulse switch off after indication is always
off by software fault indication issued
OFF: in case of fault
in case of synchronization
SYT 9, RESET of all Power
Controllers is required
K1 alarm relay K1 ON: relay K1
open circuit released in case of fault
OFF: relay K1 the alarm relay switches
pulled-in in case of fault upon activation of
RESET
TAB. 4 OVERVIEW MONITORING
Star connection
without neutral conducter
Delta connection Star connection
with neutral conductor