ABB RELION RET670 User Manual

ANSI11000304-1-en.vsd
ANSI11000304 V1 EN-US
Figure 254: Load Encroachment characteristic in under Impedance function
The resistive settings of this function is also provided in percentage of ZBase.
It is calculated according to equation
412.
( / 3) /ZBase VRated IRated=
GUID-90239033-D824-4479-A03A-41EE034C9021-ANSI V1 EN-US (Equation 412)
The LdAngle is a separate setting.
8.21.2.8 External block signals
GUID-8DDEDD52-37DC-4330-BE56-CBC37F0545AD v2
The under impedance function will have to be blocked in the event of PT fuse fail. A
BLKZ input for this purpose is provided. Also a BLOCK input is provided.
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 507
Application manual

ABB RELION RET670 Specifications

General

Rated Frequency	50/60 Hz
Communication Protocols	IEC 61850, IEC 60870-5-103, DNP3
Operating Temperature Range	-25°C to +55°C
Mounting	Rack Mounting
Input Voltage	100-240 V AC
Protection Functions	Overcurrent Protection
Enclosure	IP20