Protective Function Configuration
5
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 | |
|
| (default is 100000) |
3203 | KVAR Time Delay | |
|
| (default is 1800) |
3204 | KVA Function | Enabled or Disabled |
3205 | KVA Pickup | |
3206 | KVA Time Delay | |
|
| (default is 1800) |
3207 | PF Lead Function | Enabled or Disabled |
3208 | PF Lead Pickup | |
|
| (default is 0.8) |
3209 | PF Lead Sign | lag or lead |
3210 | PF Lead Delay | |
|
| (default is 1800) |
3211 | PF Lag Function | Enabled or Disabled |
3212 | PF Lag Pickup | |
|
| (default is 0.8) |
3213 | PF Lag Sign | lag or lead |
3214 | PF Lag Delay | |
|
| (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.
30 | Siemens Energy & Automation, Inc. |
