Siemens ISGS SG8158-00 - Manual (Page 36)

Protective Function Configuration
30 Siemens Energy & Automation, Inc.
Demand calculations are made every subperiod (3103,
3104, or 3105). The number of subperiods depends on the
length of the demand interval and is based on 10, the mini-
mum number of monitoring intervals in a subperiod. For
example, a 15 minute interval can have one or three subperi-
ods, a 30 minute interval can have 1, 2, 3, or 6 subperiods.
The length of a subperiod is your demand period divided by
the number of subperiods.
The Average Current Demand function can be enabled or
disabled (3106) in this Demand Setpoints function. When
enabled, the Overcurrent Demand function causes an alarm
if the average current demand value exceeds the setpoint.
The pickup value for the Average Current Demand function
(3107) ranges from 0 to 9999 A.
The Kilowatt Demand function (3108) can be enabled or dis-
abled. When enabled, the Kilowatt Demand function causes
an alarm if the kilowatt demand value exceeds the setpoint.
The pickup value for the Kilowatt Demand function (3109)
ranges from 0 to 999,999 kW.
5.19 Power Setpoints
The ISGS relay is capable of activating outputs and sending
events when predefined power measurements exceed the
set thresholds. These setpoints can be enabled or disabled
and are capable of activating any output. Measurement and
setpoint parameters in address block 3200 set the alarm
reporting threshold for the ISGS relay.
The Power Setpoints function allows the setting of all power
setpoints.
3200 Power Setpoints
Address Parameter Selection
3201 KVAR Function Enabled or Disabled
3202 KVAR Pickup 0-999,999 kVAR (1 kVAR steps)
(default is 100000)
3203 KVAR Time Delay 0-3600 s (1 s steps)
(default is 1800)
3204 KVA Function Enabled or Disabled
3205 KVA Pickup 0-999,999 kVA (1 kVA steps)
3206 KVA Time Delay 0-3600 s (1 s steps)
(default is 1800)
3207 PF Lead Function Enabled or Disabled
3208 PF Lead Pickup 0.2-1.0 (0.1 steps)
(default is 0.8)
3209 PF Lead Sign lag or lead
3210 PF Lead Delay 0-3600 s (1 s steps)
(default is 1800)
3211 PF Lag Function Enabled or Disabled
3212 PF Lag Pickup 0.2-1.0 (0.1 steps)
(default is 0.8)
3213 PF Lag Sign lag or lead
3214 PF Lag Delay 0-3600 s (1 s steps)
(default is 1800)
The kVAR and the kVA functions (3201 and 3203) can be
enabled or disabled. If enabled, the functions cause an alarm
if the kVAR or the kVA value exceeds the setpoint for the pre-
set time delay.
The kVAR and the kVA function pickup value (3202 and
3204) ranges from 0 to 999,999 kVAR or kVA.
The time delay for kVAR and kVA can be adjusted from 0 to
3600 seconds in steps of 1 second.
The leading or lagging power factor function can be enabled
or disabled (3207 and 3211). If one of the functions is
enabled, it causes an alarm if the power factor value leads or
lags the setpoint.
The threshold for both leading and lagging power factors
(3208 and 3212) ranges from 0.2 to 1.0 in steps of 0.1.
The sign for the leading or lagging power factor (3209 and
3213) can be set to lead or lag.
The time delay for both leading and lagging power factors
can be adjusted from 0 to 3600 seconds in steps of 1 sec-
ond.
The leading setpoint will react if the measured power factor
leads the setpoint for the set delay time. The lagging setpoint
will react if the measured power factor lags the setpoint for
the set delay time.
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