4 FEATURES AND FUNCTIONS
4.1 PROTECTION FUNCTIONS
The P14x range of devices provides the following protection functions:
ANSI IEC 61850 Protection Function
37 Undercurrent detection (low load)
46 NgcPTOC Negative sequence overcurrent
46BC Broken Conductor
49 ThmPTTR Thermal Overload
50 SOTF Switch onto Fault
50BF RBRF CB Failure
50 OcpPTOC Definite time overcurrent protection
50N EfdPTOC
Earth Fault Definite time overcurrent protection
Measur
ed and Derived (standard EF CT), Derived (SEF CT)
51 OcpPTOC IDMT overcurrent protection (stages)
51N EfdPTOC Neutral/Ground IDMT overcurrent protection
67 OcpPTOC Directional Phase Overcurrent
67N EfdPTOC Directional Neutral Overcurrent
Wattmetric Earth Fault
CLP Cold load pick up
VTS VT supervision
CTS CT supervision
64N RefPDIF Restricted Earth Fault
Sensitive Earth Fault (with SEF CT only)
68 2nd Harmonic Blocking
27 VtpPhsPTUV Undervoltage
47 Negative sequence overvoltage
59 VtpPhsPTOV Overvoltage
59N VtpResPTOV Residual Overvoltage
81O FrqPTOF Overfrequency
81U FrqPTUF Underfrequency
81df/dt Rate of change of frequency (df/dt)
81V DfpPFRC Undervoltage blocking of frequency protection
Programmable curves
51V Voltage Controlled Overcurrent
51R Voltage Restrained Overcurrent
25 Check synchronising
32 Phase Directional Power
Sensitive power
Load Encroachment supervision
(Load Blinder
s)
79 RREC Autor
eclose (3 phases)
21FL Fault Locator
81RF DfpPFRC Frequency supervised rate of change of frequency
P14x Chapter 1 - Introduction
P14xEd1-TM-EN-1 7
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