3-66 Protection Functions Date Code 20080110
SEL-387E Instruction Manual
When 24CCS = ID:
The element operates with a composite inverse-time and definite-time characteristic.
Level 2 Inverse-Time Pickup (24IP)
Range
: 100–200%
The 24IP setting defines the pickup point of the inverse-time portion of the operating time curve.
The SEL-387E Relay asserts the 24C2 Relay Word bit without time delay when the transformer
volts/hertz exceeds the 24IP setting.
Level 2 Inverse-Time Curve (24IC)
Range
: 0.5, 1.0, 2.0
The 24IC setting defines the element operating time curve shape.
Level 2 Inverse-Time Factor (24ITD)
Range
: 0.10–10.0 s
The 24ITD setting defines the inverse element operate time in seconds when the transformer
volts/hertz equals 200 percent.
Level 2 Pickup Two (24D2P2)
Range
: 101–200%
Level 2 Time-Delay Two (24D2D2)
Range
: 0.04–400.00 s
The 24D2P2 and 24D2D2 settings define the pickup and definite operating time of the definite-
time portion of the composite curve. The relay asserts the 24C2T Relay Word bit in time defined
by the inverse curve when the measured apparatus volts/hertz is less than the 24D2P2 setting.
The relay asserts the 24C2T Relay Word bit in time defined by the 24D2D2 definite-time settings
when the measured apparatus volts/hertz is greater than the 24D2P2 setting. The setting for 24IP
must be less than the setting for 24D2P2.
When 24CCS = I:
The element operates with a simple inverse-time characteristic, depending on the 24IC setting.
The relay asserts the 24C2T Relay Word bit in time defined by the inverse curve when the
measured apparatus volts/hertz exceeds the 24IP setting.
Level 2 Inverse-Time Pickup (24IP)
Range
: 100–200%
The 24IP setting defines the pickup point of the inverse-time portion of the operating time curve.
The SEL-387E Relay asserts the 24C2 Relay Word bit without time delay when the measured
apparatus volts/hertz exceeds the 24IP setting.
Level 2 Inverse-Time Curve (24IC)
Range
: 0.5, 1.0, 2.0
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