ABB Relion 670 Series Product Manual page 20

Line differential protection RED670 2.0
Product version: 2.0
Table 1. Basic IED functions, continued
IEC 61850 or function Description
name
ALTRK Service tracking
ACTIVLOG Activity logging parameters
FSTACCS Field service tool access via SPA protocol over ethernet communication
PCMACCS IED Configuration Protocol
SECALARM Component for mapping security events on protocols such as DNP3 and IEC103
DNPGEN DNP3.0 communication general protocol
DNPGENTCP DNP3.0 communication general TCP protocol
CHSEROPT DNP3.0 for TCP/IP and EIA-485 communication protocol
MSTSER DNP3.0 for serial communication protocol
OPTICAL103 IEC 60870-5-103 Optical serial communication
RS485103 IEC 60870-5-103 serial communication for RS485
IEC61850-8-1 Parameter setting function for IEC 61850
HORZCOMM Network variables via LON
LONSPA SPA communication protocol
LEDGEN General LED indication part for LHMI
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.
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.
20
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.
YNdx
CT
d
Y
CB CB
CT
IED
The most typical
application
IEC05000058-2 V1 EN
Figure 5. Examples of applications of the REFPDIF
Line differential protection, 3 or 6 CT sets L3CPDIF, L6CPDIF
Line differential protection applies the Kirchhoff's law and
compares the currents entering and leaving the protected
multi-terminal circuit, consisting of overhead power lines,
1MRK505310-BEN C
CT CT
CB
CB
Autotransformer
CB CT
CB
CT
The most complicated
application - autotransformer
IEC05000058-2-en.vsd
ABB