4.47
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
If 64FFLT := 1, indicating a non-functional SEL-2664 or fiber-optic
connection, then the 64F elements are not calculated, the 64F1, 64F1T, 64F2,
and 64F2T Relay Word bits are set to zero (0), and all accumulated timer
values are reset to zero (0). Table 4.7 lists the setting prompt, range, and
factory-default name for the field ground protection element settings.
When the SEL-2664 module is not in use, set the E64F setting equal to N.
When the SEL-2664 is connected to the generator field winding and the
SEL-700G, set the 64F Input Option setting equal to Y.
Set the 64F element torque control equation (64FTC) to enable or disable the
64F elements. When the 64FTC SEL
OGIC
control equation calculates to zero
(0), the 64F1, 64F1T, 64F2, and 64F2T Relay Word bits are set to zero (0),
and all accumulated timer values are reset to zero (0).
System Backup Protection
The SEL-700G Relay offers three choices for system backup protection. Use
EBUP setting (see Table 4.8) to select one or more of the available elements,
Distance (DC), Voltage Restraint (V), or Voltage Controlled (C) Overcurrent
elements. By setting EBUP := DC_V, both Distance and Voltage Restraint
Overcurrent (DC_V) elements can be enabled. By setting EBUP := DC_C,
both Distance and Voltage Controlled Overcurrent (DC_C) elements can be
enabled.
Distance Elements
The SEL-700G provides a two-zone distance element designed for backup
distance protection for system phase-to-phase and three-phase faults. Each
zone is equipped with independently settable forward reach, reverse offset,
maximum torque angle, and definite-time delay. The relay uses compensator
distance elements consisting of phase-to-phase and three-phase elements.
In a typical application, you might set the Zone 1 element to reach into the
generator step-up transformer and, with little or no time delay, protect the
phase-to-phase and three-phase faults external to the generator differential
zone to as far as the transformer delta winding. You can then set the Zone 2
element to reach through the step-up transformer into the system and use a
longer time delay. Alternatively, you can set the Zone 1 element to provide
backup protection for faults on the high-side bus with a coordinating time
delay and set the Zone 2 element with a long reach and long time delay for
breaker failure backup protection. You can use the load encroachment feature
to prevent misoperation of the distance elements resulting from heavy load
conditions.
Table 4.7
Field Ground Protection Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
64F PROT EN
Y, N
E64F := N
64F LVL 1 PICKUP
OFF, 0.5-200.0 kilohm
64F1P := 100.0
64F LVL 1 DELAY
0.00-99.00 s
64F1D := 60.00
64F LVL 2 PICKUP
OFF, 0.5-200.0 kilohm
64F2P := OFF
64F LVL 2 DELAY
0.00-99.00 s
64F2D := 60.00
64F TRQCTRL
SEL
OGIC
64FTC := 1
NOTE:
The Relay Word bit 64F2T is
configured to shut down the
generator in the factory-default
logic. See Trip/Close Logic Settings
for details. Change the setting if your
application requires a different
action.
Summary of Contents for SEL-700G Series
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