Enhanced Introduction to Schneider Electric Easergy P5F30 Numeric Relays

The Schneider Electric Easergy P5F30 Numeric Relay is an advanced, multi-functional protection device engineered to optimize the reliability and efficiency of electrical distribution networks across industrial installations and utility substations, regardless of voltage level (from low to high voltage systems).

Comprehensive Protection Suite: It integrates a full range of current-based protections (e.g., overcurrent, short-circuit, earth fault) and voltage-based protections (e.g., overvoltage, undervoltage, phase imbalance), ensuring robust defense against electrical anomalies.

Operational Efficiency Tools: Beyond protection, it provides real-time electrical measurements (current, voltage, power quality metrics), flexible control capabilities (remote switching, logic programming), and detailed recording/monitoring functions (event logs, waveform capture) to support proactive maintenance and system analysis.

Versatile System Compatibility: Designed for universal application, it seamlessly adapts to various neutral grounding configurations, including solidly grounded, impedance grounded, Petersen coil grounded, and isolated (ungrounded) systems—making it a versatile solution for diverse electrical network architectures.

This relay combines precision, adaptability, and user-friendly operation to meet the critical needs of modern power distribution systems. 

Protection functions:

Phase overcurrent 50/51

Directional phase overcurrent 67

Earth fault overcurrent 50N/51N

Restricted earth fault 64REF

Directional earth fault 67N

Transient earth fault 67NI

Neutral admittance 21YN

Earth fault wattmetric 32N

Capacitor bank unbalance 51C

Broken conductor 46 I2/I1

Current unbalance 46 I2/I1

Cold load pick-up

Switch ON to fault (SOTF)

H2 detection

H5 detection

Breaker failure 50BF

Directional active underpower 37P

Fault locator 21FL

Recloser 79

Negative sequence overcurrent 46

Overvoltage 59

Undervoltage 27

Earth fault overvoltage 59N

Underfrequency 81/81N

Rate of change of frequency 81R

Synchro-check 25

Lockout relay 86

CT supervision 60

VT supervision 60

Programmable stages 99

Programmable logic

Programmable curve