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4.13
Date Code 20070117
Instruction Manual
SEL-351-5, -6, -7 Relay
Loss-of-Potential, Load Encroachment, and Directional Element Logic
Directional Control for Neutral Ground and Residual Ground Overcurrent Elements
give an overview of how these directional elements
are enabled and routed to control the neutral ground and residual ground
overcurrent elements.
that setting ORDER enables the directional
elements. Setting ORDER can be set with the elements listed and defined in
, subject to the setting combination constraints in
. Note that
and
also list the directional element availability, per model
(according to the neutral channel [IN] rating).
details the availability of the ground directional elements for the
various combinations of the PTCONN, VSCONN, and VNOM settings. If
none of the ground directional elements are available (per
), group setting E32 (directional control enable) can only be set to N.
Settings for Voltage Input Configuration on page 9.39
for information
on these settings.
Also, note that
(and lower left-hand corner of
) detail the mutual exclusivity of ORDER setting choices I, S, P, and
U. If particular directional elements are not available (due to model type) or
are not listed in setting ORDER, these nonavailable or nonlisted directional
elements are
defeated
and
nonoperational
.
For example, suppose that setting choice S is listed in setting ORDER. By
virtue of not being available or not being listed in setting ORDER, the
directional elements corresponding to setting choices I, P, and U (see
, and
defeated
and
nonoperational
. So, for
nonavailable setting choice I, corresponding internal enable 32IE = logical 0
and directional outputs F32I = logical 0 and R32I = logical 0. Similarly, for
the directional elements corresponding to nonlisted setting choices P and U,
the logic outputs are at a logical 0 state.
The order in which these directional elements are listed in setting ORDER
determines the priority in which they operate to provide Best Choice Ground
Directional™ logic control. See the discussion on setting ORDER in
Directional Control Settings on page 4.38
Internal Enables
,
,
, and
.
lists the internal enables and their correspondence to the ground
directional elements.
Table 4.3
Ground Directional Element Availability by Voltage Connection Settings
Element
Designation
in ORDER
Setting
Availability
a
When VNOM
≠
OFF
VSCONN = VS
Availability
When
VNOM
≠
OFF
VSCONN = 3V0
Availability
When
VNOM = OFF
VSCONN = VS
Availability
When
VNOM = OFF
VSCONN = 3V0
PTCONN = WYE
PTCONN = DELTA
PTCONN = WYE or
PTCONN = DELTA
PTCONN = WYE or
PTCONN = DELTA
PTCONN = WYE or
PTCONN = DELTA
Q
Yes
Yes
Yes
No
b
No
V
Yes
No
Yes
No
Yes
I
Yes
Yes
Yes
Yes
Yes
S
Yes
No
Yes
No
Yes
P
Yes
No
Yes
No
Yes
U
Yes
No
Yes
No
Yes
a
Subject to Availability of Elements by Relay Model shown in
b
The displayed setting range for the ORDER setting may show these element choices, but the relay will not accept these choices when a
settings save is attempted.
Содержание SEL-351-5
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