ABB RELION RED670 Series Product Manual page 27

Line differential protection RED670 2.2
Product version: 2.2
Table 9. 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
High impedance differential protection, single phase HZPDIF
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
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.
ABB
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
REFPDIF can also protect autotransformers. Five currents are
measured at the most complicated configuration as shown in
Figure 5.
M13071-3 v13
YNdx
CT
d
Y
CB
CT
IED
The most typical
application
IEC05000058-2 V1 EN-US
Figure 5. Examples of applications of the REFPDIF
High speed line differential protection for 4 CT sets, 2-3 line
ends L4CPDIF
High speed line differential protection for 4 CT sets, 2-3 line
ends (L4CPDIF) is a unit type protection system with typical
M13047-3 v19
operate time less than one cycle. These types of systems are
suitable for the protection of complex transmission network
configurations because they exhibit good performance during
evolving, inter-circuit, and cross-country faults. They are also
highly immune to power swings, mutual coupling and series
impedance unbalances. High speed line differential protection
requires 2 Mbit/s communication channel to transfer analog
signals.
1MRK 505 379-BEN C
CT
CB
CB
CB
CT
The most complicated
application - autotransformer
GUID-57872A74-462D-4513-B75B-A46ADCE03522 v2
CT
CB
Autotransformer
CB CT
IEC05000058-2-en.vsd
27