5-78
F650 DIGITAL BAY CONTROLLER
GEK-106310-AF
5.4 PROTECTION ELEMENTS
CHAPTER 5: SETPOINTS
Table 5-50: Isolated ground IOC element settings
The relay settings for the Isolated Ground IOC elements are as follows:
Function
:
This setting determines whether the element is operative and can generate pickup
and trip events, which can be configured to close outputs, light up LEDs or trigger
oscillography.
Vh, VL, Ih, IL
:
Vn and In values that define the points in the operative area.
Operation time (Delay)
:
This is the selectable period between the element pickup and trip, with a range from
0 to 900 seconds in steps of 0,01 seconds.
Deviation time to Instantaneous (Time to inst)
: Time after the trip during which the elements become instantaneous. It
must be set to zero if the functionality is not required.
Snapshot Events:
The snapshot event setting enables or disables the snapshot event generation for
this element.
OPERATION PRINCIPLES:
Operation of the isolated Ground element is based on the detection of a current that exceeds the setting, with neutral
voltage supervision (3V0). This allows very sensitive setting of the element, with a very low current level, ensuring that
small angle or ratio errors in the current transformers do not cause the relay to operate, as the neutral voltage verified is
higher than the one set.
Values for Ih, IL, Vh and VL, which define the relay operation area, are configurable. H magnitudes must be higher than L
magnitudes. The 50IG element can be supervised by directional element 67SG.
Using the relay input magnitudes In and Vn, if the point defined by (In, Vn) is inside the operation area and if the directional
element (if directional supervision is set) allows it, the element picks up and the set delay time starts counting down. If a
directional block appears during the countdown, the element is reset. After the set time the element trips. Once tripped, the
relay cannot be blocked by the directional element, and the trip remains while the fault exists.
After the trip, the deviation time to instantaneous starts to run, so that all pickups produced during this time produce an
Instantaneous trip. This means that, if after a trip the breaker is reclosed and the fault persists or reappears, the trip is
instantaneous. If the user doesn’t want to use this function, then the
Deviation Time to Instantaneous (Time to inst)
setting must be set to zero seconds. Once the time has expired, the element returns to its normal operation.
SETPOINT > PROTECTION ELEMENT > SETTING GROUP X > Sensitive Ground Current > Isolated Ground IOC
Isolated Ground IOC 1> Isolated Ground IOC 2 > Isolated Ground IOC 3
setting Description
Name
Default Value
Step
Range
Function Permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
High Voltage
Vh Level
20
1 V
[2 : 70]
Low Current
Il LEVEL
0.005
0.001 A
[0.005 : 0.400]
Low Voltage
Vl LEVEL
2
1 V
[2 : 70]
High Current
Ih LEVEL
0.025
0.001 A
[0.005 : 0.400]
Operation time
Delay
0.00
0.01 s
[0.00 : 900.00]
Deviation time to instantaneous
Time to inst
0.00
0.01 s
[0.00 : 900.00]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Summary of Contents for F650
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