Siemens ISGS SG8158-00 - Manual (Page 28)

Protective Function Configuration
22 Siemens Energy & Automation, Inc.
5.3 High-Set Instantaneous Phase
Overcurrent (50HS)
The High-Set Instantaneous Phase Overcurrent function
causes an undelayed trip when any individual measured
phase current exceeds the preprogrammed threshold
(pickup value). The relay will trip at 100% of the set pickup
point.
The function can be enabled or disabled (1551). The range of
the pickup value (1552) depends on the secondary phase CT
rating (1 A or 5 A) and the value is in secondary amperes.
Each of the two waveform capture buffers (1560 and 1561)
can be independently programmed to freeze snapshots on
trip.
The function is able to actuate any binary output contact on
pickup, and any trip or binary output contact on trip.
5.4 Instantaneous Neutral or Ground
Overcurrent (50N)
The Instantaneous Neutral or Ground Overcurrent function
has an adjustable delay whose input is the current measured
by the neutral CT. It begins timing when the neutral or ground
current exceeds the pickup value. The ISGS relay will pickup
at 100% of set pickup point and drop out at 95% of the
pickup point.
A1500 High-SetInstantaneous Phase Overcurrent (50HS)
Address Parameter Option
1551 Function Enabled or Disabled
1552 Pickup 5A CTs: 5-120 A or
1A CTs: 0.2-24 A
(0.1 A steps)
1560 Freeze Wfm1 on Trip, or None
1561 Freeze Wfm2 on Trip, or None
A1600 Instantaneous Neutral or Ground Overcurrent
(50N)
Address Parameter Option
1601 Function Enabled or Disabled
1602 Pickup 5 A CTs: 1-120 A or
1 A CTs: 0.2-24 A
(0.1 A steps)
1604 Time Delay 0-60 s (0.01 s steps)
1610 Freeze Wfm1 on Pickup, on Trip, or None
1611 Freeze Wfm2 on Pickup, on Trip, or None
1612 Blocked by None, 50HS & 50HSN, 50HSN,
or 50HS
The Instantaneous Neutral or Ground Overcurrent function
can be enabled or disabled (1601). The form of protection
provided depends on the manner in which the external CTs
are connected to the ISGS relay. Figure 4.5 in Chapter 4
shows correct CT connections and polarities.
The range of the pickup value (1602) depends on the sec-
ondary neutral CT rating (1 A or 5 A) and the value is in sec-
ondary amperes.
The time delay (1604) represents the time between pickup
and trip and can be adjusted from 0 to 60 seconds in steps
of 0.1 second. If the function remains in pickup for longer
than the time delay, this parameter causes a trip. The delay
can also be set to infinity so that the function never times out.
Each of the two waveform capture buffers (1610 and 1611)
can be independently programmed to freeze snapshots on
pickup or trip.
The function is able to actuate any binary output contact on
pickup, and any trip or binary output contact on trip.
5.5 High-Set Instantaneous Neutral or
Ground Overcurrent (50HSN)
The High-Set Instantaneous Neutral or Ground Overcurrent
function causes an undelayed trip when any individual mea-
sured phase current exceeds the preprogrammed threshold
(pickup value). The relay will trip at 100% of the set pickup
point.
The High-Set Instantaneous Neutral or Ground Overcurrent
function can be enabled or disabled (1651).
The range of the pickup value (1652) depends on the sec-
ondary phase CT rating (1 A or 5 A) and the value is in sec-
ondary amperes.
Each of the two waveform capture buffers (1660 and 1661)
can be independently programmed to freeze snapshots on
trip.
The function is able to actuate any binary output contact on
pickup, and any trip or binary output contact on trip.
A1600 High-Set Instantaneous Neutral or Ground
Overcurrent (50HSN)
Address Parameter Option
1651 Function Enabled or Disabled
1652 Pickup 5 A CTs: 5-120 A or
1 A CTs: 0.2-24 A
(0.1 A steps)
1660 Freeze Wfm1 on Trip, or None
1661 Freeze Wfm2 on Trip, or None
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