Beijing Sifang CSC-211 Digital Line Protection and Control Device

1.1 Device Introduction
CSC-211 is a line protection and control device suitable for neutral point non-direct grounding systems with voltage levels below 110kV. It can be installed locally on switchgear and is designed as Version 2.10 specifically for power plant user requirements.
1.1.1 Protection Functions
a) Three-stage definite-time overcurrent protection (can be blocked by low voltage or direction), where Stage III can be set as an inverse-time section (when set to inverse-time, definite-time overcurrent protection Stages II and III are automatically disabled);
b) Three-stage definite-time zero-sequence overcurrent protection (can be blocked by direction), where Stage III can be set as an inverse-time section (when set to inverse-time, definite-time zero-sequence overcurrent protection Stages II and III are automatically disabled);
c) Small current grounding line selection;
d) Overload protection (trip option available);
e) Closing acceleration protection (pre-acceleration, post-acceleration, and manual closing acceleration);
f) Under-frequency load shedding protection;
g) Low-voltage separation function;
h) Three-phase single-shot auto-reclosing (with synchronization check, voltage check, or non-synchronization);
i) Manual closing function (with synchronization check, voltage check, or non-synchronization);
j) FC overcurrent blocking protection function.
1.1.2 Measurement and Control Functions
a) 15 channels of digital input for telemetry, device status change telemetry, and fault telemetry;
b) Remote control of normal circuit breaker opening/closing, and remote control for small current grounding detection;
c) Telemetry of analog quantities such as Ua, Ub, Uc, Ia, Ic, P, Q, cos?, F;
d) Forward/reverse active energy, forward/reverse reactive energy;
e) Event SOE recording;
f) 2 channels of pulse P and Q input.
1.1.3 Other Functions
a) PT broken wire alarm;
b) Control bus broken wire alarm;
c) Spring not charged alarm;
d) Fault recording;
e) 4-20mA function;
f) 32 setting groups.