Directional Features For Measured (Ix) Ground Fault Elements 50X/51X - Eaton EDR-5000 Nstallation, Operation And Maintenance Manual

Directional Features for Measured (IX) Ground Fault Elements 50X/51X

All ground fault elements can be selected as » Non-directional/Forward/Reverse« operated. This has to be done in the
» Device Planning« menu.
Important Definitions
Polarizing Quantity: This is the quantity that is used as a reference value. The polarizing quantity can be selected by
the parameter » IX Direction Control« in the [System Para/Direction] menu as follows:
The following table gives the User a quick overview of the all possible directional settings.
50X/51X Direction Decision
by Angle Between:
Measured ground current and neutral voltage:
IX, 3V0 (measured)
Measured ground current and neutral voltage:
IX, 3V0 (calculated)
Negative sequence voltage and current
I2, V2
For the direction detection, it is mandatory that the required voltages
exceed 0.35 V and the required currents exceed 10 mA. An exception is the
measured sensitive ground current which has to exceed 1 mA.
»IX 3V0« : The neutral voltage selected by the parameter » 3V0 Source« will be used as the
polarizing quantity. The traditional way to polarize a ground fault element is to use neutral
voltage (3V0). The neutral voltage can, however, be either » measured« or » calculated« . This
can be selected by the parameter » 3V0 Source« in the [System Para/Direction] menu.
»IX Neg« : With this selection, the negative phase sequence voltage and current (Polarizing:
V2/Operating: I2) will be used to detect direction. The monitored current is still the measured
residual current IX.
»IX Dual« : For this method, the negative phase sequence voltage » V2« will be used as
polarizing quantity if » V2« and »I 2« are available, otherwise 3V0 will be used. The operating
quantity is either I2 if » V2« and »I 2« are available, else IX.
EDR-5000
[System Para/
Direction]
The Following Angle
Has to Be Set:
Ground MTA
Ground MTA
90° + Phase MTA
www.eaton.com
[System
Para/Direction]:
IX Dir Cntrl =
IX 3V0
IX 3V0
IX Neg
IM02602007E
[System
Para/Direction]:
3V0 Source =
Measured
Calculated
N.A.
488