GE 889 Instruction Manual page 179

CHAPTER 4: SETPOINTS
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
RATE
Range: 1 cycle, 1 second, 30 seconds, 1 minute, 15 minutes, 30 minutes, 1 hour
Default: 1 minute
This setting selects the time interval at which the actual value is recorded.
CHANNEL 1(16) SOURCE
Range: Off, Any FlexAnalog parameter
Default: Off
This setpoint selects the metering analog value that is to be recorded in Channel 1(16) of
the data log. The parameters available in a given relay are dependent on: the type of
relay, the type and number of CT/VT hardware installed, and the type and number of
Analog Inputs hardware installed. Upon startup, the relay automatically prepares the
parameter list.
CHANNEL 1(16) MODE
Default: Sample
Range: Sample, Min, Max, Mean
This setpoint defines the type of sample to be logged in the data logger record with
respect to the selected rate, i.e the time interval selected under the setpoint "Rate".
While enabled the Data Logger executes every protection pass and each of the four
modes —Sample, Max, Min or Mean. The flexanalog values are updated at protection-
pass rate:
In "Sample" mode the data logger records the flexanalog value updated in the first
protection-pass from the time interval selected under setpoint "Rate".
In "Max" mode the data logger records the maximum protection pass value of the
selected flexanalog parameter from all protection pass values from the time interval
selected under setpoint "Rate".
In "Min" mode the data logger records the minimum protection pass value of the
selected flexanalog parameter from all protection pass values from the time interval
selected under setpoint "Rate".
In "Mean" mode, the data logger records the average value among all the values at
protection-pass rate, from the time interval selected under setpoint "Rate".
The mean (average) is calculated simply using the well known ratio between the sum of
all the values and their number over the time interval.
DEVICE
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