GE T60, Instruction Manual

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5-282 T60 Transformer Protection System GE Multilin
5.7 CONTROL ELEMENTS 5 SETTINGS
5
• FREQ RATE 1 MIN FREQUENCY: This setting defines minimum frequency level required for operation of the element.
The setting may be used to effectively block the feature based on frequency. For example, if the intent is to monitor an
increasing trend but only if the frequency is already above certain level, this setting should be set to the required fre-
quency level.
• FREQ RATE 1 MAX FREQUENCY: This setting defines maximum frequency level required for operation of the ele-
ment. The setting may be used to effectively block the feature based on frequency. For example, if the intent is to mon-
itor a decreasing trend but only if the frequency is already below certain level (such as for load shedding), this setting
should be set to the required frequency level.
If the signal source assigned to the frequency rate of change element is only set to auxiliary VT, then the minimum
voltage supervision is 3 V.
Figure 5–142: FREQUENCY RATE OF CHANGE SCHEME LOGIC
NOTE
| V_ 1 | > P I CKUP
F R EQ RAT E 1 BLOCK :
Off
RU N
F R EQ RAT E 1 SOURC E:
Pos seq vo l tage ( V_ 1)
F R EQ RAT E 1 F U N CT I O N:
SETTINGS
E nab l ed = 1
Pos seq current ( I_ 1)
F requency ( F )
A
N
D
F R EQ RAT E 1 O V SUP V
P I CKUP :
SETTING
SETTING
| I_ 1 | > P I CKUP
RU N
F R EQ RAT E 1 OC SUP V
P I CKUP :
SETTING
F > M IN & F < MAX
RU N
F R EQ RAT E 1 M IN
F R EQ U EN CY :
SETTINGS
F R EQ RAT E 1 MAX
F R EQ U EN CY :
A
N
D
Ca l cu l ate df/dt
RU N
df/dt > P I CKUP
RU N
SETTINGS
F R EQ RAT E 1 P I CKUP :
F R EQ RAT E 1 TR EN D :
FLEXLOGIC OPERANDS
F R EQ RAT E 1 DPO
F R EQ RAT E 1 OP
F R EQ RAT E 1 PKP
F R EQ RAT E 1 R E S E T
D E LAY :
SETTINGS
F R EQ RAT E 1 P I CKUP
D E LAY :
t
PKP
t
RST
832023A2.CDR