GE Multilin F650 - Frequency Rate of Change; Overfrequency Element (81 O)

CHAPTER 5: SETPOINTS 5.4 PROTECTION ELEMENTS
GEK-106310-AF F650 DIGITAL BAY CONTROLLER 5-97
** For firmware below 7.20 version, only the first three underfrequency elements is available.
The snapshot event setting enables or disables the snapshot event generation for this element.
Frequency elements operate with the system frequency, this frequency is measured in the voltage channel set for the
frequency reference, in the Frequency Reference setting inside Setpoint > System Setup >General Settings.
5.4.10.2 Overfrequency element (81O)
81O is an overfrequency protection element. The pickup setting can be selected from 20.00 to 65.00 Hz, with a time delay
selectable between 0 and 900 seconds. The element-reset delay is from 0.00 to 900.00 seconds.
Underfrequency elements (81U) can be configured by using Enervista 650 Setup at Setpoint>Protection
Elements>Setting Group X
Table 5-64: 81O element settings
** For firmware below 7.20 version, only the first three overfrequency elements is available.
The snapshot event setting enables or disables the snapshot event generation for this element.
Frequency elements operate with the system frequency, this frequency is measured in the voltage channel set for the
frequency reference, in the Frequency Reference setting inside Setpoint > System Setup >General Settings.
5.4.10.3 Frequency rate of change
F650 uses a defined signal as frequency reference. This signal is analyzed by the Digital Signal Processor and time
between two consecutive zero-crossing is measured. Reference signal is set in Setpoint > System Setup > General
Settings > Frequency Reference.
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Minimum voltage threshold Minimum Voltage 30 1 V [10 : 300]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
Frequency Source Frequency Source LINE FRQ N/A [LINE FRQ - BUS FRQ]
Setpoint > Control Elements > Overfrequency
OVERFREQUENCY 1 > OVERFREQUENCY 2 > OVERFREQUENCY 3 >OVERFREQUENCY 4>OVERFREQUENCY 5>OVERFREQUENCY 6
setting Description Name Default Value Step Range
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup level Pickup Level 50.50 0.01 Hz [20.00 : 65.00]
Trip time Trip Delay 0.00 0.01 s [0.00 : 900.00]
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Minimum voltage threshold Minimum Voltage 30 1 V [10 : 300]
Snapshot event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
Frequency Source Frequency Source LINE FRQ N/A [LINE FRQ - BUS FRQ]
SETPOINT > Protection Elements > Setting Group X > FREQUENCY RATE OF CHANGE
FREQUENCY RATE OF CHANGE 1 > FREQUENCY RATE OF CHANGE 2 > FREQUENCY RATE OF CHANGE 3
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function Permission Function DISABLED N/A [DISABLED – ENABLED]
Direction of the frequency change Freq. rate trend INCREASING N/A [INCREASING - DECREASING - BI-
DI
RECTIONAL]
Operation Value in Hz/s Freq. rate pickup 0.50 0.01 Hz/s [0.10 : 10.00]
Minimum required voltage in %
nom
inal voltage
Freq. rate OV supv 40.00 0.01% [0.00 : 110.00]
Minimum Frequency Threshold Freq. rate min 45.00 0.01 Hz [20.00 : 80.00]
Maximum Frequency Threshold Freq. rate max 65.00 0.01 Hz [20.00 : 80.00]
Frequency rate Trip Delay Freq. rate delay 0.00 0.01 s [0.00 : 60.00]