Appendix B -Settings and Signals
MENU TEXT COL ROW DEFAULT SETTING AVAILABLE OPTIONS
DESCRIPTION
Setting to enable or disable the third stage definite time sensitive earth fault element.
ISEF>3 Direction 3A 4A Non-Directional
Non-Directional
Directional Fwd
Directional Rev
This setting determines the direction of measurement for the third stage element.
ISEF>3 Current 3A 4D 0.4
From 0.005*I3 to 0.8*I3 in steps of 0.001*I3
[Courier Number (current)]
Pick-up setting for the third stage sensitive earth fault element.
ISEF>3 Delay 3A 4E 0.5
From 0 to 200 in steps of 0.01
[Courier Number (time-seconds)]
Setting for the operating time delay for third stage sensitive earth fault element.
ISEF>4 Status 3A 50 Disabled
Enabled
Setting to enable or disable the fourth stage definite time sensitive earth fault element.
ISEF>4 Direction 3A 51 Non-Directional
Directional Fwd
Directional Rev
This setting determines the direction of measurement for the fourth stage element.
ISEF>4 Current 3A 54 0.6
From 0.005*I3 to 0.8*I3 in steps of 0.001*I3
[Courier Number (current)]
Pick-up setting for the fourth stage sensitive earth fault element.
ISEF>4 Delay 3A 55 0.25
From 0 to 200 in steps of 0.01
[Courier Number (time-seconds)]
Setting for the operating time delay for fourth stage sensitive earth fault element.
ISEF> Blocking 3A 57 0x00F
VTS Blks ISEF>2
VTS Blks ISEF>3
VTS Blks ISEF>4
A/R Blks ISEF>3
A/R Blks ISEF>4
Logic Settings that determine whether blocking signals from VT supervision affect certain earth fault overcurrent stages.
VTS Block - only affects sensitive earth fault protection. With the relevant bit set to 1, operation of the Voltage Transformer Supervision (VTS),
will block the stage. When set to 0, the stage will revert to Non-directional upon operation of the VTS.
ISEF> Char Angle 3A 59 90
From -95 to 95 in steps of 1
[Courier Number (angle)]
Setting for the relay characteristic angle used for the directional decision.
ISEF> VNpol Set 3A 5B 5
From 0.5*V1 to 88*V1 in steps of 0.5*V1
[Courier Number (voltage)]
Setting for the minimum zero sequence voltage polarizing quantity required for directional decision.
PN> Setting 3A 5E 9
From 0.0*V1*I3 to 20*V1*I3 in steps of 0.05*V1*I3
[Courier Number (power Watts)]
Setting for the threshold for the wattmetric component of zero sequence power. The power calculation is as follows:
The PN> setting corresponds to:
Vres x Ires x Cos (φ – φc) = 9 x Vo x Io x Cos (φ– φc)
Where; φ = Angle between the Polarizing Voltage (-Vres) and the Residual Current
φc = Relay Characteristic Angle (RCA) Setting (ISEF> Char Angle)
Vres = Residual Voltage
Ires = Residual Current
Vo = Zero Sequence Voltage
Io = Zero Sequence Current
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