PSS 212 relays are designed for overcurrent and earth fault protection in medium and high voltage electrical systems. These relays can function as either main or backup protection. Notably, they operate without requiring any external auxiliary supply.
Key features of the EKOSsr 50 relay include:
Self-Powered or Dual-Powered Versions: The EKOSsr 50 can be ordered in either self-powered or dual-powered configurations.
Manual Configuration: It can be fully configured manually, eliminating the need for setting software.
Customization via USB: The EKOSsr 50 setting software allows customization of configuration parameters via a USB port.
Additional Functions: The relay offers measurement, monitoring, and recording functions accessible via the communication port.
Capacitance Discharge Output: Capable of providing sufficient power to a low-energy trip coil of a circuit breaker.
Flag Indicator: An external flag indicator indicates whether a trip event has occurred.
Rear RS485 Port: Allows control of the circuit breaker (with close and trip commands).
Flexible Mounting Options: Housed in an optional flush or wall-mounting metal case, it can be easily adapted to various applications.
Technical Data:
Nominal Frequency: 50/60 Hz
Phase Current Measurement: 5% pickup accuracy (rms of the three-phase input currents)
Phase Current Setpoint Limits:
I > 0.9 to 2.5 x IS
I >> 1 to 20 x IS
Neutral Current Measurement: Computed from the three-phase input currents (IE >> 0.2 to 2.5 x IS)
Neutral Current Tripping Time: tIE >> 0.1s to 20s
Definite-Time Overcurrent Element Tripping Time Setting Limits:
tI > 0.04 to 300s
Inverse-Time Overcurrent Characteristics:
Normal Inverse (N-INV)
Very Inverse (V-INV)
Extremely Inverse (E-INV)
Long Time Inverse (L-INV)
RI-Inverse (RI-INV)
Fuse Characteristics:
HV Fuse
Full Range Fuse (FR-Fuse)
Time Factor: 0.05 to 10
Tripping Times for Definite-Time Short Circuit Element: tI >> 0.04s to 3s
Self supply relay
PSS 212
The self supply PSS 212 provides definite-time and inverse-time 3 phase overcurrent protection and earth fault current protection for electrical power systems.
Technical Questions
What is a self-supply relay?
How are relays used in industrial automation and control systems?
What are the key parameters to consider when selecting a relay for a specific application?
Technical Assets
The PSS 212 which meets the highest requirements on a digital protection device, is a CT-powered protection relay occupies minimum space. Simple and safe wiring, high electromagnetic interference immunity, easy adjustment and the ability to scale to different power quantities of the switchboard are important advantages.