GE B30 UR Series Instruction Manual page 335

Bus differential system

Hide thumbs Also See for B30 UR Series:

Table of Contents

The minimum and maximum voltage values to be monitored (in pu) are:

minimum voltage

The following settings should be entered:

DCMA OUTPUT H3 SOURCE

: "0 to 1 mA"

DCMA OUTPUT H3 RANGE

DCMA OUTPUT H3 MIN VAL

DCMA OUTPUT H3 MAX VAL

The limit settings differ from the expected 0.7 pu and 1.1 pu because the relay calculates the positive-sequence quantities

scaled to the phase-to-ground voltages, even if the VTs are connected in "Delta" (refer to the Metering conventions section

in chapter 6), while at the same time the VT nominal voltage is 1 pu for the settings. Consequently the settings required in

this example differ from naturally expected by the factor of

The worst-case error for this application could be calculated by superimposing the following two sources of error:

±0.5% of the full scale for the analog output module, or

±0.5% of reading

For example, under nominal conditions, the positive-sequence reads 230.94 kV and the worst-case error is

0.005 x 230.94 kV + 1.27 kV = 2.42 kV.

-------------------------- -

: "SRC 2 V_1 mag"

: "0.404 pu"

: "0.635 pu"

B30 Bus Differential System

5.9 TRANSDUCER INPUTS AND OUTPUTS

maximum voltage

-------------------------- -