PTT
When the PTT feature is available it enables the setting of trip thresholds for Trips 1-4, Single Shot and Work Tag.
Setting Currents, Pickup Multipliers, and Reset Threshold Multipliers which are otherwise global settings for each element can be individually configured for each element for each trip (Max 24 per protection group).
Configuration
In order to use this feature, PTT must be made available by the operator via the WSOS Feature Selection menu.
The Feature Selection menu can be found by navigating through:
> > .
Operation
Selecting PTT in Feature Selection
causes WSOS to display a message prompting the user to copy the global
threshold settings for each element to all the trips (Trip 1, 2, 3,
4, Single Shot, and Work Tag) in each of the protection groups. See
below.
Selecting Yes won’t change any effective protection settings initially but will allow each element for each trip to be configured with individual threshold settings. Selecting No will use values from the last time PTT was enabled. If PTT has not been enabled before it will use the default values. See table below:
Table 28 PTT Default Settings
|
PTT Default Settings |
|||
|---|---|---|---|
| Setting |
Trips 1/2/3/4 |
Single Shot |
Work Tag |
|
Phase setting current (Amps) |
200 |
200 |
200 |
|
Phase pickup multiplier |
1.0 |
1.0 |
1.0 |
|
Phase reset threshold multiplier (%) |
90 |
90 |
90 |
|
Earth setting current |
40 |
40 |
40 |
|
Earth pickup multiplier |
1.0 |
1.0 |
1.0 |
|
Earth reset threshold multiplier (%) |
90 |
90 |
90 |
|
SEF setting current |
4 |
4 |
4 |
|
SEF pickup multiplier |
1.0 |
1.0 |
1.0 |
|
SEF reset threshold multiplier (%) |
90 |
90 |
90 |
|
NPS setting current |
40 |
40 |
40 |
|
NPS pickup multiplier |
1.0 |
1.0 |
1.0 |
|
NPS reset threshold multiplier (%) |
90 |
90 |
90 |
The default values for PTT are the same as the default global threshold values.
When PTT are enabled, the global thresholds are no longer displayed by WSOS on the global settings page as shown in the Figure 130.
Figure 129
PTT On and Off
Instead, threshold settings for each element are displayed on the individual trip setting pages as per the Trip 1 settings below:
Figure 130
Trip 1 settings with PTT On