GE G60 UR Series, Инструкция по эксплуатации

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GE Multilin G60 Generator Protection System 5-189
5 SETTINGS 5.6 GROUPED ELEMENTS
5
STAGE 1 SETTINGS:
The stage 1 characteristic is typically set to detect a loss of excitation for load conditions of 30% of the nominal or higher.
This is achieved with a mho element with a diameter equal to the base impedance of the machine and an offset equal to
half the machine transient reactance (
X
′
d ).
(EQ 5.32)
The stage 1 element should be time delayed to allow for blocking by the VT fuse failure element (50 ms).
STAGE 2 SETTINGS:
The stage 2 characteristic is typically set to detect a loss of excitation for all load conditions. This is achieved with a mho
element with a diameter equal to the synchronous reactance of the machine and an offset equal to half the machine tran-
sient reactance (
X
′
d ).
(EQ 5.33)
During stable power swing conditions the positive-sequence impedance may momentarily enter the stage 2 characteristic.
For security of the function under such conditions, it is recommended to delay stage 2 by a minimum of 0.5 seconds.
The
LOSS OF EXCIT BLK
setting specifies a FlexLogic™ operand for blocking the feature based on user-programmable con-
ditions. When the blocking input is asserted, the element resets its timers, de-asserts the
PKP
and
OP
operands (if
asserted), clears self-reset targets, logs a ‘blocked’ event if events are enabled, and becomes inactive. When unblocked,
the element will start functioning instantly. If exposed to pickup conditions for an extended period of time and unblocked, the
element will pickup and start timing out at the moment of unblocking.
The element responds to the positive sequence impedance as shown below.
Figure 5–106: LOSS OF EXCITATION SCHEME LOGIC
CENTER 1
Zb X
′
d +
2
-----------------------
, RADIUS 1
Zb
2
------- = =
CENTER 2
Xd X
′
d +
2
-----------------------
, RADIUS 1
Xd
2
------- = =
LOSS OF EXCITATION
FUNCTION:
LOSS EXCIT BLK:
SETTING
SETTING
Generator=1, Motor=1
Disabled=0
SETTING
Enabled=0
Disabled=1
LOSS OF EXCITATION
SOURCE:
SETTING
I_1
V_1
Off=0
830001AB.CDR
LOSS OF EXCITATION
CENTER 1:
LOSS OF EXCITATION
FUNCTION:
LOSS OF EXCITATION
CENTER 2:
LOSS OF EXCITATION
PKP DELAY 1:
LOSS OF EXCITATION
PKP DELAY 2:
LOSS OF EXCITATION
RADIUS 1:
LOSS OF EXCITATION
RADIUS 2:
RUN
RUN
OR
OR
SETTINGS
SETTING
SETTING
FLEXLOGIC OPERANDS
FLEXLOGIC OPERANDS
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
LOSS EXCIT STG1 PKP
LOSS EXCIT STG2 PKP
LOSS EXCIT STG1 DPO
LOSS EXCIT STG2 DPO
LOSS EXCIT STG1 OP
LOSS EXCIT STG2 OP
LOSS EXCIT OP
LOSS EXCIT PKP
LOSS EXCIT DPO
0 ms 20 ms
0 ms
0 ms
20 ms 0 ms
I_1 > 0.05 pu
BLOCK (See description)
RUN
COMPARATOR
RUN
SETTING
LOSS OF EXCITATION UV
SUPV 2 :
SETTING
Enabled=0
Disabled=1
LOSS OF EXCITATION
UV SUPV :
LOSS OF EXCITATION UV
SUPV 1 :
OR
OR
AND
|V_1| < PICKUP AND