GE L30 Instruction Manual page 254

Line current differential system
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PRODUCT SETUP
GOOSE, buffered report, and unbuffered report messages are for the most part transmitted only when there is a value
change in one or more of their members. Most analog values continuously dither by an amount that is not significant.
Were a report to be sent each time an insignificant analog value change occurred, then the communications network
floods with GOOSE and report messages, degrading response time for all users.
To control this, a deadband setting is provided for each analog value. Also, in addition to the present actual value of each
analog ("instMag" in the following figure), there is a deadbanded value ("mag" in the figure), which is updated with the
present value only when the difference between the two exceeds the deadband setting (db in the figure). Changes to this
deadbanded value trigger transmissions when included in GOOSE and report data sets.
Deadband settings are entered in UR Setup software in units of percent of the difference between the "max." and "min." of
the associated analog value. A zero deadband setting suppresses transmission triggering. The range of deadband settings
is 0.000 to 100.000% in steps of 0.001. The default value is 0.000%.
5
GGIO4 elements have individual settings for "min." and "max." The min. and max. for FlxEIGAPC#.OpSig.db (FLEXELEMENT #
OpSig) are -50 pu and +50 pu respectively. The min. value for all other quantities is 0. The max. values are as follows:
Phase current — 46 x phase CT primary setting
Neutral current — 46 x ground CT primary setting
Phase and phase-to-phase voltage — 275 x VT ratio setting
Power (real, reactive, apparent, 3-phase, and 1-phase) — 46 x phase CT primary setting x 275 x VT ratio setting
Energy (real or imaginary) — 46 x phase CT primary setting x 275 x VT ratio setting x 1 hour
Frequency — 90 Hz
Frequency rate of change — 90 Hz/s
Power factor — 2
Angle — 360 degrees
Select the deadband settings from knowledge of the characteristics of the power system quantity measured and
knowledge of the demands of the applications receiving the measurement via GOOSE or report such that changes of
significance to the application are promptly reported, yet the network is not overly burdened with event messages.
Signal sources
Deadband parameters of measured values related to the signal sources are configured here.
Breaker 1
The UR breaker control and status monitoring elements have certain settings that configure how the IEC 61850 protocol
interacts with these elements. These settings are described in this section. See the Breakers section in the System Setup
section of this chapter for details on the operation of breaker control elements.
Navigate to Settings > Communications > IEC 61850 > System Setup > Breakers > Breaker 1 to access the settings that
configure the IEC 61850 protocol interface with the first breaker control and status monitoring element. The settings and
functionality for the others are similar.
5-76
Figure 5-31: Deadband settings
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS

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