4.17
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
q
To Figure 4.5.
Figure 4.12
AO87P2 Logic
Differential Element Settings in SEL-700G1, SEL-300G, SEL-387, and
SEL-587.
The SEL-700G1 restraint quantity IRTn calculation differs from the
SEL-300G, SEL-587, and SEL-387 by a factor of 2. To achieve the same
characteristics for the differential elements in the SEL-700G1, SEL-300G,
SEL-387, and SEL-587, you must account for this factor of 2. Following are
the settings relationships among the four products.
Convert the SEL-300G, SEL-387, and SEL-587 Relay Settings to the
SEL-700G1 Relay
O87P
700G1
= O87P
300G/387/587
SLP1
700G1
= 1/2 • SLP1
300G/387/587
SLP2
700G1
= 1/2 • SLP2
300G/387/587
IRS1
700G1
= 2 • IRS1
300G/387/587
U87P
700G1
= U87P
300G/387/587
Convert the SEL-700G1 Relay Settings to the SEL-300G, SEL-387, and
SEL-587 Relays
O87P
300G/387/587
= O87P
700G1
SLP1
300G/387/587
= 2 • SLP1
700G1
SLP2
300G/387/587
= 2 • SLP2
700G1
IRS1
300G/387/587
= 1/2 • IRS1
700G1
U87P
300G/387/587
= U87P
700G1
Setting Calculation
General Discussion of Connection Compensation.
The general
expression for current compensation is as follows:
where IAn, etc., are the three-phase currents entering terminal “n” of the relay;
I1nC, etc., are the corresponding phase currents after compensation; and
[CTC(m)] is the three-by-three compensation matrix.
Setting CTCn = m specifies which [CTC(m)] matrix the relay is to use. For
CTCY the setting values can be 0, 1, 5, 6, 7, 11, or 12. These are discrete
values “m” can assume in [CTC(m)]; the values physically represent the “m”
number of increments of 30 degrees that a balanced set of currents with ABC
I1XC1
I2XC1
I3XC1
|KCLI|
1.1
O87P
(setting)
3.0
min
O87P2
(setting)
O87P2
≠
AUTO
O87P2 = AUTO
AO87P2
q
I1YC1
I2YC1
I3YC1
Σ
Σ
I1
n
C
I2
n
C
I3
n
C
CTC
m
IA
n
IB
n
IC
n
=
Содержание SEL-700G Series
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