IEC 61850 / Function
block name
ANSI
Function description
OC4SPTOC
51/67
Four-step phase overcurrent protection
EFPIOC
50N
Instantaneous residual overcurrent protection
EF4PTOC
51N/67N
Four-step directional residual overcurrent protection
SDEPSDE
67N
Sensitive directional residual overcurrent and power protection
UC2PTUC
37
Time-delayed two-step undercurrent protection
LCPTTR
26
Thermal overload protection, one time constant, Celsius
LFPTTR
26
Thermal overload protection, one time constant, Fahrenheit
TRPTTR
49
Thermal overload protection, two time constants
CCRBRF
50BF
Breaker failure protection
CSPRBRF
50BF
Breaker failure protection
STBPTOC
50STB
Stub protection
CCRPLD
52PD
Pole discordance protection
BRCPTOC
46
Broken conductor check
GUPPDUP
37
Directional underpower protection
GOPPDOP
32
Directional overpower protection
DNSPTOC
46
Negative sequence-based overcurrent function
AEGGAPC
50AE
Accidental energizing protection for synchronous generator
NS2PTOC
46I2
Negative-sequence time overcurrent protection for machines
VR2PVOC
51V
Voltage-restrained time overcurrent protection
Voltage protection
UV2PTUV
27
Two-step undervoltage protection
OV2PTOV
59
Two-step overvoltage protection
ROV2PTOV
59N
Two-step residual overvoltage protection
OEXPVPH
24
Overexcitation protection
LOVPTUV
27
Loss-of-voltage check
STEFPHIZ
59THD
100% Stator earth fault protection, 3rd harmonic based
Frequency protection
SAPTUF
81
Underfrequency function
SAPTOF
81
Overfrequency function
SAPFRC
81
Rate-of-change frequency protection
Table 3:
Control and monitoring functions
IEC 61850 / Function
block name
ANSI
Function description
Control
SESRSYN
25
Synchrocheck, energizing check and synchronizing
SMBRREC
79
Autorecloser
Table continues on next page
Section 1
1MRK 511 261-UEN -
Introduction
10
650 series
Engineering Manual