Siemens ISGS SG8158-00 - Manual (Page 33)

Protective Function Configuration
Siemens Energy & Automation, Inc. 27
The Undervoltage function can be enabled or disabled
(2301).
The Curve parameter (2302) allows the selection of a definite
time delay or a characteristic curve. When the definite time
characteristic is selected, the time delay begins as soon as
the device goes into pickup. The inverse time characteristic
utilizes a moderate inverse curve using the time dial.
The Pickup Source Voltage parameter (2303) indicates the
VT connection. If the VTs are connected line-to-ground, the
device can pickup on line-to-line or line-to-ground voltages.
If the VTs are connected line-to-line, the VTs can only pickup
on line-to-line voltages. The maximum continuous voltage
across a VT input is 150 VAC.
The pickup value (2304) is in secondary volts ranging from
60 to 250 V. The function begins timing when any individual
phase voltage exceeds the pickup voltage setting.
The time delay (2305) represents the time between pickup
and trip and can be set when definite time is selected. The
delay can be adjusted from 0.1 to 60.0 seconds in steps of
0.01 second. If the function remains in pickup for longer than
the time delay, the function causes a trip. The delay can also
be set to infinity so that the function never times out.
The Time Dial parameter (2306) is used for the characteristic
curve. The dial allows the time-to-trip of the curve to be
raised or lowered. It can be adjusted from 0.1 to 9.9 in steps
of 0.1.
Each of the two waveform capture buffers (2310 and 2311)
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.
5.13 Phase Sequence Voltage (47)
The Phase Sequence Voltage function operates instanta-
neously if the correct system voltage phase sequence
defined in the hardware configuration is not present at the
device voltage inputs. This function will not respond if the
input to the device is less than 40 V line-to-line or 23.1 V line-
to-neutral. The function operates without delay or inverse
time characteristic. It responds in 100 ms or less.
The Phase Sequence Voltage function can be used to pre-
vent closure of a breaker. The assigned output contact would
be wired to open a contact in the breaker-close circuit and
remain activated until the line rotation is normal.
A2400 Phase Sequence Protection (47)
Address Parameter Option
2401 Function Enabled or Disabled
2410 Freeze Wfm 1 on Trip, or None
2411 Freeze Wfm 2 on Trip, or None
The 47 Phase Sequence Voltage function can be enabled or
disabled (2401).
Each of the two waveform capture buffers (2410 and 2411)
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.
5.14 Negative Sequence Voltage (47N)
The Negative Sequence Voltage function operates when the
percent negative sequence voltage exceeds the preset value
for a specified time. This function resets instantaneously
when the negative sequence voltage drops below pickup.
The Negative Sequence Voltage function can be enabled or
disabled (2451).
The Curve parameter (2452) allows the selection of a definite
time delay or an inverse curve. The inverse time characteris-
tic utilizes a moderate inverse curve using the time dial.
The pickup value (2453) ranges from 4% to 40% of negative
sequence voltage. The function begins timing when the per-
cent of negative sequence voltage exceeds the preset value
for a specified time.
The time delay (2454) represents the time between pickup
and trip and can be set when definite time is selected. The
delay can be adjusted from 0 to 100 seconds in steps of
0.01 second. The delay can also be set to infinity so that the
function never times out.
The Time Dial parameter (2455) is used for the characteristic
curve. The dial allows the time-to-trip of the curve to be
raised or lowered. It can be adjusted from 0.1 to 9.9 in steps
of 0.1.
A2400 Negative Sequence Voltage (47N)
Address Parameter Option
2451 Function Enabled or Disabled
2452 Curve Definite or Inverse
2453 Pickup 4-40% negative sequence
(1% steps)
2454 Time Delay (Def.) 0-100 s (0.01 s steps),
or infinity
2455 Time Dial (Inverse) 0.1-9.9 (0.1 steps)
2456 Max Time (Inverse) 1-250 s (1 s steps)
2457 Blocked at 40-120 V (1 V steps)
2460 Freeze Wfm 2 on Pickup, on Trip, or None
2461 Freeze Wfm 2 on Pickup, on Trip, or None
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