Differential Protection; 1Ph High Impedance Differential Protection Hzpdif; Restricted Earth-Fault Protection, Low Impedance Refpdif; Local Hmi Functions - ABB RED670 Product Manual

Line differential protection RED670 2.1 IEC
Product version: 2.1
Table 5. Basic IED functions, continued
IEC 61850 or function
name
CAMCONFIG
CAMSTATUS
TOOLINF
SAFEFILECOPY
Table 6. Local HMI functions
IEC 61850 or function
name
LHMICTRL
LANGUAGE
SCREEN
FNKEYTY1–FNKEYTY5
FNKEYMD1–
FNKEYMD5
LEDGEN
OPENCLOSE_LED
GRP1_LED1–
GRP1_LED15
GRP2_LED1–
GRP2_LED15
GRP3_LED1–
GRP3_LED15

3. Differential protection

1Ph High impedance differential protection HZPDIF

The 1Ph High impedance differential protection 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. Several function block instances (for example, six)
can be available in a single IED.
ABB
Description
Central account management configuration
Central account management status
Tools Information component
Safe file copy function
ANSI Description
Local HMI signals
Local human machine language
Local HMI Local human machine screen behavior
Parameter setting function for HMI in PCM600
General LED indication part for LHMI
LHMI LEDs for open and close keys
Basic part for CP HW LED indication module

Restricted earth-fault protection, low impedance REFPDIF

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.
1MRK 505 346-BEN -
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