5-130 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.5 CONTROL ELEMENTS CHAPTER 5: SETPOINTS
Snapshot event generation: Enables or disables the snapshot event generation for this element.
5.5.11 60 CTS failure
For firmware 7.50 or above, the F650 incorporates, one CT failure element which can be used to detect if any of the current
transformers experience abnormal conditions resulting in phase lost.
Phase lost, caused by a current transformer (CT) failure, or CT secondary wiring can lead to undesired operation by some
of the enabled protection elements. The most affected protection would be the differential protection - main transformer
percent differential, and the restricted ground fault, as well as some overcurrent protection such as the neutral and
negative sequence instantaneous, and timed over-current elements.
Function This setting allows enabling and disabling the CTS function.
3I0 Current PKP: This setting defines the level of neutral current, above which CT failure would pick up.
Refer to the CT Failure logic diagram for more detail.
3V0 Voltage Inhibit This setting defines the level of neutral voltage (3V0) above which the CT failure
detection is inhibited.
GND Current Inhibit This setting defines the level of ground current above which CT failure detection is
inhibited.
SGND Current Inhibit This setting defines the level of sensitive ground current above which CT failure
detection is inhibited.
TIME DELAY This setting defines the time for CT failure to operate.
SETPOINTS > CONTROL ELEMENTS > CURRENT TRANSFORMER FAILURE
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function Permission Function Permission DISABLED N/A [DISABLED – ENABLED]
Neutral Current PKP 3I0 Current PKP 0.10 0.01 [0.05- 10.00]
Neutral Voltage Inhibit 3V0 Voltage Inhibit 20.0 0.1 [0.0-240.0]
GND Current Inhibit GND Current Inhibit 0.05 0.01 [0.05-10.00]
SGND Current Inhibit SGND Current Inhibit 0.005 0.001 [0.005-1.000]
Time Delay Time Delay 0.00 0.01 [0.00 -600.00]
Snapshot events Snapshot events DISABLED N/A ENABLED/DISABLED
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