Table 9. Basic IED functions, continued
IEC 61850 or function
name
Description
ALTMS Time master supervision
ALTIM Time management
CAMCONFIG Central account management configuration
CAMSTATUS Central account management status
TOOLINF Tools information
COMSTATUS Protocol diagnostic
Table 10. Local HMI functions
IEC 61850 or function
name
ANSI Description
LHMICTRL Local HMI signals
LANGUAGE Local human machine language
SCREEN Local HMI Local human machine screen behavior
FNKEYTY1–FNKEYTY5
FNKEYMD1–FNKEYMD5
Parameter setting function for HMI in PCM600
LEDGEN General LED indication part for LHMI
OPENCLOSE_LED LHMI LEDs for open and close keys
GRP1_LED1–
GRP1_LED15
GRP2_LED1–
GRP2_LED15
GRP3_LED1–
GRP3_LED15
Basic part for CP HW LED indication module
4.
Differential protection
High impedance differential protection, single phase
HZPDIF
M13071-3 v13
High impedance differential protection, single phase
(HZPDIF) functions can be used when the involved CT
cores have the same turns ratio and similar magnetizing
characteristics. It utilizes an external CT secondary
current summation by wiring. Actually all CT secondary
circuits which are involved in the differential scheme are
connected in parallel. External series resistor, and a
voltage dependent resistor which are both mounted
externally to the IED, are also required.
The external resistor unit shall be ordered under IED
accessories in the Product Guide.
HZPDIF can be used to protect tee-feeders or busbars,
reactors, motors, auto-transformers, capacitor banks
and so on. One such function block is used for a high-
impedance restricted earth fault protection. Three such
function blocks are used to form three-phase, phase-
segregated differential protection.
Restricted earth-fault protection, low impedance
REFPDIF
M13047-3 v20
Restricted earth-fault protection, low-impedance
function (REFPDIF) can be used on all directly or low-
impedance earthed windings. The REFPDIF function
provides high sensitivity and high speed tripping as it
protects each winding separately and thus does not
need inrush stabilization.
The REFPDIF function is a percentage biased function
with an additional zero sequence current directional
comparison criterion. This gives excellent sensitivity and
stability during through faults.
REFPDIF can also protect autotransformers. Five
currents are measured at the most complicated
configuration as shown in Figure
5.
Line differential protection RED670
1MRK 505 379-BEN N
28 Hitachi Power Grids
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