Inputs/Outputs; Contact Inputs - GE L90 Instruction Manual

CHAPTER 5: SETTINGS
— This setting defines the maximum frequency level required for operation of the element.
FREQ RATE 1 MAX FREQUENCY
The setting can be used to effectively block the feature based on frequency. For example, if the intent is to monitor a
decreasing trend but only if the frequency is already below a certain level (such as for load shedding), set this setting to the
required frequency level.
If the signal source assigned to the frequency rate of change element is only set to auxiliary VT, then the minimum
voltage supervision is 3 V.

5.9 Inputs/outputs

5.9.1 Contact inputs

SETTINGS  INPUTS/OUTPUTS  CONTACT INPUTS
 CONTACT INPUTS




L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-229: Frequency rate of change logic
 CONTACT INPUT H5a

CONTACT INPUT H5a ID:

Cont Ip 1
CONTACT INPUT H5a

DEBNCE TIME: 6.0 ms
CONTACT INPUT H5a

EVENTS: Disabled
↓
 CONTACT INPUT xxx

 CONTACT INPUT
 THRESHOLDS
INPUTS/OUTPUTS
Range: up to 20 alphanumeric
characters
Range: 0.0 to 16.0 ms in steps of 0.5
Range: Disabled, Enabled
5
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