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7
Optional Features
7.1 Directional Earth Fault Setting Range
Polarising Quantity
1V polarising voltage
Characteristics:
DTL, IEC-NI, IEC-VI, IEC-EI,IEC-LTI, ANSI-MI, ANSI-VI, ANSI-EI.
DEF OverCurrent Setting
0.05 x I
to 4 x I
in steps of 0.05
n
n
DEF IDMTL Characteristic setting
0.05 x In - 4 x In in 0.05 steps.
DEF Characteristic Angle Setting
0° to 85° lagging in steps of 5°
DEF DTL Timer (DT1)
0 to 5 secs in steps of 10ms
DEF IDMTL Time Multiplier:
0.025-1.6 in steps of 0.025
RESET Characteristics:
DTL, Instantaneous, ANSI Decaying.
8
Performance Specification
Throughout the performance specification accuracy statements are made at reference conditions. These
reference conditions are as follows:
Reference Conditions
General
Auxiliary Supply
Frequency
Characteristic Line Angle
Ambient Temperature
Zone 1 impedance 6.0 Ohms
Zone 2 impedance 6.0 Ohms
Zone 3 impedance 6.0 Ohms
Zone 4 impedance 6.0 Ohms
Neutral impedance Z
/Z
O
1
Z
angle = 75°
O
8.1 Accuracy General
Transient Overreach of Distance Protection for X/R =
35
Disengaging Time
Note:
Output contacts have a minimum dwell time of 100ms, after which the disengaging time is as above.
8.2 Accuracy Influencing Factors
Temperature
Ambient range
Variation over range
Frequency
©2011 Siemens Protection Devices Limited
ratio 2.5
7SG164 Ohmega 400 Series Performance Specification
IEC60255
Parts 6, 6A & 16
Nominal
50 or 60Hz
75°
20°C
±-5%
30ms
-10°C to +55°C
≤ 5%
Chapter 5 Page 6 of 13
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