Technical Data Of The Measuring Devices - ABB REF 54 Series Technical Reference Manual, General

1MRS750527-MUM
5.1.6.2.
Feeder Terminal
Technical Reference Manual, General
The scaling factor is calculated channel by channel as follows:
Scaling factor = I / I
nmd
I Rated primary current of the measuring device (A)
nmd
I Rated primary current of the protected unit connected to the channel
np
Example:
Rated primary current of current trafo = 500 A:
Rated current of the protected unit = 250 A:
Scaling factor for current channels:
The scaling factor is not used for general measurement signals
connected to the analog channel.
The scaling factors for the analog channels can be set via the HMI of the feeder
terminal or with the Relay Setting Tool. The HMI path for the scaling factors is:
Main Menu/ Configuration/ Protected unit/ Ch 1: scaling,
Ch 2: scaling...
For storing the values listed above, refer to Section "Storing of parameters and
recorded data" on page 33.

Technical data of the measuring devices

When the feeder terminal is configured, the technical data of the measuring devices
is set in separate dialog boxes in the Relay Configuration Tool. The set values will
affect the measurements carried out by the feeder terminal.
For storing the values listed below, refer to Section "Storing of parameters and
recorded data" on page 33.
Values to be set for a current transformer:
• Rated primary current (1...6000 A)
• Rated secondary current (5 A, 2 A, 1 A, 0.2 A) of the primary current
transformer.
• Rated current (5 A, 1 A, 0.2 A) of the current measuring input (= rated current of
the matching transformer of the feeder terminal).
• Amplitude correction factor (0.9000...1.1000) of the primary current transformer
at rated current.
• Correction parameter for the phase displacement error of the primary current
transformer at rated current (-5.00°...0.00°).
• Amplitude correction factor of the primary current transformer at a signal level of
1% of the rated current (0.9000...1.1000).
• Correction parameter for the phase displacement error of the primary current
transformer at a signal level of 1% of the rated current (-10.00°...0.00°).
1. Prior to Release 2.5, the current range is 0...6000 A.
where
np,
1
of the primary current transformer.
REF 54_
I = 500 A
nmd
I = 250 A
np
1
500 A / 250 A = 2.000
39