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3.7 .4
Protective Function Configuration
In tre following sections, information explaining row to con-
figure tre protective functions is provided. For most of the
protective functions, some or all of the available parameters
can be set in two different parameter
sets.
Refer to section
3.12.2 for a detailed discussion of these parameter
sets.
In brief, there are two parameter sets
-
the primary set and
the alternate set. Either set can be selected as the active set
that controls tre operation of the
relay.
When configuring tre
protective functions, make settings in both tre primary and
alternate parameter sets, unless a alternate parameter set is
not desired. The primary parameter set is denoted by an
"A"
n
front of the address number, and the alternate parameter
set is denoted by a
"B"
n
front of tre address number. For
example, tre address displa)ed for a primary parameter will
be
"A1500",
while the address for an alternate parameter
will be
"81500".
To make parameter changes, you must first
enter the password. If you only want to review present set-
tings, the password steps 4 and 5 are not necessary.
Perform parameter changes using tre steps in the standard
operation sequence, Table 3.4. Complete steps 1 through 9
if you only desire a primary parameter set. Complete steps 1
through 14 if you desire both a primary and an altemate
parameter set.
Note that the settings for parameter sets A and B are
entered in tre major address block for the protection ele-
ment that is being configured. However, the parameter set
which the ISGS relay is actively using is selected at address
block 7100.
Protective functions for which altemate parameter sets are
available are indicated in Table 3.3.
3.7.5
Overcurrent Instantaneous Phase 50
(Address 1500)
Use this address block to change the instantaneous phase
overcurrent pickup value and time delay. The available relay
subaddresses are lsted in Table 3.9.
Sub address
Parameter
Selection
1501
FlX\Ction
Enable or Disable
1502
Pickup
5
ACT's:
1
120A
or
1 ACTs:0.2- 24A
1504
Time
Celay
0-60 s
1510
Freeze
Wfm1
01
Pickup, on Trip,
or None
1511
FreezeWfm2
on
Pickup,
on
Trip,
or None
Ta
ble
3.9 50 Phase Configuration, MaJOr Block 1500
This protection function consists of phase instantaneous
overcurrent protection, plus an adjustable
delay.
Tre instan-
taneous function begins timing when any individual phase
current exceeds the pickup current setting (1502). Tre
Siemens
Energy
&Automation,
Inc.
3
Operation
instantaneous overcurrent protection can be enabled or dis-
abled. The time delay is adjustable from 0.0 to 60.0 sec-
onds, in steps of 0.1
seconds.
Each of tre two waveform capture buffers can be indepen-
dently programmed to freeze tre snapshot on pickup, on
trip, or not at all (151 0 and 1511 ). For this protection ele-
ment, tre default for buffer 1 is "on Trip" and for buffer 2 it is
"None."
These settings are not included in the altemate
parameter sets.
The settings for phase instantaneous overcurrent (50) are
independent of the settings for ground instantaneous over-
current (50N) and tre time overcurrent settings (51 and
51N).
3.7.6
Overcurrent Instantaneous Neutral or
Ground 50N (Address 1600)
Use this address block to change the instantaneous neutraV
ground overcurrent pickup value and time delay. The avail-
able relay subaddresses are listed in Table 3.10.
Subaddress
Parameter
Selection
1601
FlXlction
Enable or Disable
1602
Pickup
5 A CTs: 1 - 120 A
or
1 ACTs:
02-
24 A
1604
Time
Delay
0-60 s
1610
FreezeWtm1
01
Pickup,
01
Trip,
or None
1611
Freeze Wfm2
on Pickup, on Trip,
or None
Table 3.10
50N Neutral or Ground Configuration, Major
Block 1600
This function is similar to tre phase instantaneous overcur-
rent function described in section 3.7.5, except that the pro-
tection responds to current input to tre fourth (intemal) CT.
The form of protection provided depends on the manner in
which the extemal CTs
ae
connected to the ISGS relay.
Fig-
ure 3.4 shows the correct CT connections and polarities.
Each of the two waveform capture buffers can be indepen-
dently programmed to freeze tre snapsrot on pickup, on
trip, or not at all (1510 and 1511). For this protection ele-
ment, the default for buffer 1 is
"on
Trip" and for buffer 2 it is
"None."
These settings are not included in the alternate
parameter sets.
The settings for neutraVground instantaneous overcurrent
(50N) are independent of tre settings for phase instanta-
neous overcurrent (50) and the time overcurrent settings (51
and
51N).
21
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