Table of Contents
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1
Introduction
The following document defines the technical and performance specification of the standard features in this series
of relays. Optional features are described in the last part of the document.
Performance Data to:
IEC60255-6, IEC60255-6A and IEC60255-16.
2 Technical Specification
2.1 Rated Current
Three possible current ratings can be obtained by programming the correct rating.
1, 2 or 5 Amps
2.2 Rated voltage
The relay requires a four wire voltage system, phase A, B, C & N
Rated voltage 63.5 Volts ac Phase - N
2.3 Rated Frequency
Two operating frequencies are available
Frequency - 50 or 60Hz
2.4 Characteristic Angle
The characteristic angle can be adjusted to suit any composition of line or cable circuit. This angle is used for all
zones.
Angle - 0° - 90° in 5° steps
2.5 Zone impedance settings
Distance relays usually quote the boundary of performance in terms of SIR (System Impedance Ratio) plotted
against the accuracy of the relay. This is a powerful method of describing the relays performance.
Adjustment of the positive sequence zone impedance is made by the menu selection. Each zone has the same
setting range
Rating
Zone Range
1A
0.1-250 Ohm
2A
0.1-125 Ohm
5A
0.1-50
Ohm
Any zone is selectable within the setting range specified. Step sizes within the ranges are as follows:
0.1-10ohms - 0.01ohm step,
10-100ohms - 0.1ohm step,
100-250ohms - 1ohm step.
The protection provides the option of using the 5A (or 2A) tap on a 1A CT in order to attain a lower range.
2.6 Residual Compensation
The residual compensation applies to all zones.
Z
/Z
0-10 in steps of 0.01
O
1
Z
angle – 0 to 355° in steps of 5°
O
2.7 Zone 4 Settings
The zone 4 element is a reverse of zone one and has independent impedance settings with the same range as
zone 1. The angle is a mirror image of the forward fault angle.
©2011 Siemens Protection Devices Limited
7SG164 Ohmega 400 Series Performance Specification
Chapter 5 Page 3 of 13
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