GE D30 Instruction Manual page 334

5.7 CONTROL ELEMENTS
SETTINGS
BROKEN CONDUCTOR 1
FUNCTION:
Enabled = 1
BROKEN CONDCT 1 BLK:
Off = 0
SETTINGS
BROKEN CONDUCTOR 1
SOURCE:
I2
I1
Ia
Ib
Ic
e) THERMAL OVERLOAD PROTECTION

PATH: SETTINGS CONTROL ELEMENTS
PROTECTION 1(2)
 THERMAL
 PROTECTION 1
5
The thermal overload protection element corresponds to the IEC 255-8 standard and is used to detect thermal overload
conditions in protected power system elements. Choosing an appropriate time constant element can be used to protect dif-
ferent elements of the power system. The cold curve characteristic is applied when the previous averaged load current over
the last 5 cycles is less than 10% of the base current. If this current is greater or equal than 10% than the base current, then
the hot curve characteristic is applied.
5-202
SETTING
BROKEN CONDUCTOR 1
I1 MIN :
RUN
| I1 | > I1 MIN
| Ia | < I1 MIN
| Ib | < I1 MIN
| Ic | < I1 MIN
| Ia' | - | Ia | > 0.05pu
| Ib' | - | Ib | > 0.05pu
| Ic' | - | Ic | > 0.05pu
Where I' is 4 cycles old
One phase current loss
detection
Figure 5–111: BROKEN CONDUCTOR DETECTION LOGIC

MONITORING ELEMENTS
THERMAL PROTECTION 1
FUNCTION: Disabled
THERMAL PROTECTION 1
MESSAGE
SOURCE: SRC1
THERMAL PROTECTION 1
MESSAGE
BASE CURR: 0.80 pu
THERMAL PROTECTION 1
MESSAGE
k FACTOR: 1.10
THERM PROT 1 TRIP
MESSAGE
TIME CONST: 45 min.
THERM PROT 1 RESET
MESSAGE
TIME CONST: 45 min.
THERM PROT 1 MINIM
MESSAGE
RESET TIME: 20 min.
THERM PROT 1 RESET:
MESSAGE
Off
THERM PROT 1 BLOCK:
MESSAGE
Off
THERMAL PROTECTION 1
MESSAGE
TARGET: Self-reset
THERMAL PROTECTION 1
MESSAGE
EVENTS: Disabled
D30 Line Distance Protection System
SETTING
BROKEN CONDUCTOR 1
I1 MAX :
BROKEN CONDUCTOR 1
I2/I1 RATIO :
RUN
| I1 | < I1 MAX
BROKEN CONDUCTOR 1
| I2 | / | I1 |> RATIO
I1 MAX :
t
PKP
2 cyc
0

THERMAL OVERLOAD PROTECTION
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: 0.20 to 3.00 pu in steps of 0.01
Range: 1.00 to 1.20 in steps of 0.05
Range: 0 to 1000 min. in steps of 1
Range: 0 to 1000 min. in steps of 1
Range: 0 to 1000 min. in steps of 1
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
SETTING
FLEXLOGIC OPERAND
OP
BROKEN CONDUCT 1
0
FLEXLOGIC OPERAND
PKP
BROKEN CONDUCT 1

THERMAL
GE Multilin