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2.2 Distance Protection Menu
The settings for the impedance elements are located in this menu.
Distance Scheme
There are a number of different protection schemes available in the relay depending upon the model. These can
be chosen at this setting. Only one scheme can be active at a time. The schemes are described in Section 3 of
this manual.
CT Secondary
The relay can operate from 1, 2 or 5 Amp CT secondary circuits. The value MUST be programmed for the correct
CT. This will affect the impedance measurements if not programmed correctly.
Line Angle
This is the angle of the positive sequence impedance of the composite transmission line.
EF Comp Z0/Z1 ratio
This is the ratio between the magnitudes of the zero sequence and positive sequence impedances of the system.
The ratio of Z0/Z1 is used in an internal calculation for earth-fault compensation. This is common for all Zones.
EF Comp Z0 angle
This is the angle of the zero sequence impedance of the system.
POR Weak Infeed
Operation of the Weak Infeed logic within the Permissive overreach scheme can be enabled or disabled from this
setting.
WI Local Trip
Operation of the main Trip Output for POR Weak Infeed detector operations can be enabled or disabled from this
setting.
WI Voltage Level
This is the voltage level at which the POR Weak Infeed detector registers a voltage depression which is
characteristic of a weak infeed situation.
Z1 Phase Fault
Operation of the Zone 1 phase-fault elements A-B, B-C & C-A, can be enabled or disabled from this setting.
Z1 PF Impedance
Defines the Zone 1 phase-fault impedance reach in terms of the secondary positive sequence impedance.
Z1 PF Time Delay
An independent time delay from 0 – 10s can be applied to the Zone 1 phase-fault protection elements.
Z1 Earth Fault
Operation of the Zone 1 earth-fault elements A-E, B-E & C-E, can be enabled or disabled from this setting.
Z1 EF Impedance
Defines the Zone 1 earth-fault impedance reach (in terms of secondary positive sequence impedance) for the
mho characteristic.
Z1 EF Time Delay
An independent time delay from 0 – 10s can be applied to the Zone 1 earth-fault protection elements.
Z2 Phase Fault
Operation of the Zone 2 phase-fault elements A-B, B-C & C-A, can be enabled or disabled from this setting.
Z2 PF Impedance
Defines the Zone 2 phase-fault impedance reach in terms of the secondary positive sequence impedance.
Z2 PF Time Delay
An independent time delay from 0 – 10s can be applied to the Zone 2 phase-fault protection elements.
Z2 Earth Fault
Operation of the Zone 2 earth-fault elements A-E, B-E & C-E, can be enabled or disabled from this setting.
Z2 EF Impedance
©2013 Siemens Protection Devices Limited
(Time Stepped, PUR, POR1, POR2 BOR)Time Stepped
(1..5)
1
(0..90)
75
(0..10)
2.5
(0..355) 75
(Disabled..Enabled)
(Disabled..Enabled)
(5 .. 85volts)
(Disabled..Enabled)
(0.1..250)
(0..10000)
(Disabled..Enabled)
(0.1..250)
(0..10000)
(Disabled..Enabled)
(0.1..250)
(0..10000)
(Disabled..Enabled)
(0.1..250)
7SG1641 Ohmega 402 60 Relay Settings
A
deg
deg
Enabled
Enabled
54v
Enabled
8
ohms
0
ms
Enabled
8
ohms
0
ms
Enabled
16
ohms
1000
ms
Enabled
16
ohms
Chapter 4 Page 10 of 20
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