This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
Can we use Easergy P3F30 to carry out Undervoltage protection function (ANSI 27) on two busbar sections (with two different sets of voltage transformers) ?
Issue:
Customer will use Easergy P3F30 on Buscoupler cubicle and want to protect against Undervoltage (ANSI 27) on both busbar sections.
Environment:
Easergy P3 protection function
Resolution:
For Easergy P3F30 to protect against Undervoltage (ANSI 27) on two busbar sections; programmable stages has to be utilized while using voltage measurement mode 3LN-LLy as follows:
Customer will use Easergy P3F30 on Buscoupler cubicle and want to protect against Undervoltage (ANSI 27) on both busbar sections.
Environment:
Easergy P3 protection function
Resolution:
For Easergy P3F30 to protect against Undervoltage (ANSI 27) on two busbar sections; programmable stages has to be utilized while using voltage measurement mode 3LN-LLy as follows:
- Undervoltage protection function ANSI 27 will use the voltages measured by 3LN connection for one busbar section.
- The voltages from LLy connection can be utilized in programmable stages for Undervoltage protection (taking into consideration that only one line-to-line voltage (Vab) is available) for the other busbar section.
Released for: Schneider Electric Egypt and North East Africa
