GE F650 Instruction Manual page 261

5.5 CONTROL ELEMENTS
Frequency rate of change settings are:
Rate of Change Function: This setting allows enabling or disabling the frequency rate of change element.
Freq rate trend: This setting allows to configure the element in order to answer to increasing, decreasing or both directions
frequency changes.
Freq. Rate Pickup: This setting defines the value to operate the element. If Direction is set as "Increasing", element
operates when df/dt > Pickup Level, if set as "Decreasing" when -df/dt > Pickup Level, if set as both when |df/dt| > Pickup
Level.
Freq. Rate OV supv: This setting defines the minimum required voltage. Under this level, the frequency rate of change
element is blocked. This is the percentage of the nominal voltage (adjust in general settings). Voltage used as reference is
line voltage (see frequency reference setting in general settings).
Freq rate Min: This setting defines the minimum frequency required in this unit to be enabled. For any value under this
level the element is disabled.
Freq rate Max: This setting defines the maximum frequency allowed in this unit to be enabled. For any value above this
level the element is disabled.
Freq rate Delay: Time that the element must remain picked up before it operates.
Snapshot events: The snapshot event setting enables or disables the snapshot event generation for this element.
The frequency rate of change actual values can be viewed at Actual> Status > Control Elements > Frequency:
Table 5–95: FREQUENCY RATE OF CHANGE STATUS
5
The block signals for the frequency rate of change element can be viewed at: Actual> Status > Protection > Protection
Blocks:
Table 5–96: FREQUENCY RATE OF CHANGE BLOCKS
5-114
FREQUENCY RATE OF CHANGE STATUS
FREQ RATE1 PKP
FREQ RATE1 OP
FREQ RATE2 PKP
FREQ RATE2 OP
FREQ RATE3 PKP
FREQ RATE3 OP
FREQUENCY RATE OF CHANGE BLOCKS
FREQ RATE1 BLOCK
FREQ RATE2 BLOCK
FREQ RATE3 BLOCK
F650 Digital Bay Controller
5 SETTINGS
GEK-106310AB