Guodian Nanzi PSL641U Line Protection and Control Device

1 Overview
The PSL 641U Line Protection and Control Device is based on current and voltage protection as its standard configuration, while integrating various measurement and control functions. It is suitable for
distribution lines at voltage levels of 66kV and below. Its application areas cover industries such as power, water conservancy, transportation, petroleum, chemical, coal, and metallurgy.
1.1 Protection Function Configuration
a. Three-stage directional overcurrent protection with voltage restraint
b. Two-stage directional zero-sequence protection and zero-sequence alarm
c. Overcurrent acceleration protection and zero-sequence acceleration protection
d. Overload protection (alarm or trip optional)
e. Under-frequency load shedding function
f. Under-voltage load shedding function
g. Three-phase auto-reclosing function
h. Small current grounding line selection function
i. TV disconnection detection
1.2 Measurement and Control
a. Measurement of current, voltage, power, power factor, etc.
b. 14 external switch input telemetry acquisition (up to 22 optional)
c. Circuit breaker position, manual tripping, and accident telemetry
d. Remote control of normal circuit breaker opening and closing
e. Electric energy accumulation
f. GPS time synchronization input