Extended Standard Protection

This feature is used when it is required to have different Protection Control settings associated with each configured protection group.

Protection Control settings include:

• Protection On/Off

• Auto Reclose On/Off

• NPS Protection Trip/Alarm/Off

• EF Protection On/Off

• SEF Protection On/Off

• SEF Alarm On/Off

In normal operation that is with Extended Standard Protection Off, these settings are global. That means that once they have been configured on the WSOS Control page they become operational regardless of which protection group is active.

Extended Standard Protection functionality allows the On/Off status for these settings to be determined by the active protection group.

Selecting Extended Standard Protection On, immediately adds Protection Control settings to each configured protection group. The Control page always displays the operational Protection Control settings that is the settings that are in service at the time. Another set of Protection Control settings now appears on the Global Settings page for each configured protection group. Refer Figure 122.

The settings in the figure above labelled Extended Protection Settings are the DEFAULT Protection Control settings for that group. These default settings can be configured differently for each protection group.

When the active protection group is changed, the default Protection Control settings for the group that becomes active become the operational Protection Control settings and appear on the Control page.

So if Group A is active and the operational Protection Control settings are:

• Protection On

• Auto Reclose Off

• NPS Protection Off

• EF Protection Off

• SEF Protection Off

• SEF Alarm Off

Then Group B is made active and the Group B Default Protection Control settings are:

• Protection On

• Auto Reclose On

• NPS Protection Trip

• EF Protection On

• SEF Protection On

• SEF Alarm On

The appearance of the Control page will change as shown in the figure below:

It can be seen from the above figure that when the active protection group was changed from A to B, the Group B default Protection Control settings became the operational settings shown on the Control page.

These default settings are referred to as non-volatile as they will be retained in the protection group settings despite changes to the operational settings when their group is active.

QAKs/Quick Keys

If changes are made to any of the operational Protection Control settings using the QAKs/Quick Keys, the changed setting will stay in force until either:

• The protection group is changed, or

• It is changed by the operator again