Instantaneous Differential; Hottest-Spot Temperature; Instantaneous Differential Scheme Logic - GE T60 Instruction Manual

5 SETTINGS
c) INSTANTANEOUS DIFFERENTIAL
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PATH: SETTINGS GROUPED ELEMENTS
 INSTANTANEOUS
 DIFFERENTIAL
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The instantaneous differential element acts as an instantaneous overcurrent element responding to the measured differen-
tial current magnitude (filtered fundamental frequency component) and applying a user-selectable pickup threshold. Set the
pickup threshold greater than the maximum spurious differential current that could be encountered under non-internal fault
conditions (typically magnetizing inrush current or an external fault with extremely severe CT saturation).
Figure 5–102: INSTANTANEOUS DIFFERENTIAL SCHEME LOGIC
d) HOTTEST-SPOT TEMPERATURE
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PATH: SETTINGS GROUPED ELEMENTS
 HOTTEST-SPOT
 TEMPERATURE
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GE Multilin
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SETTING GROUP 1(6) TRANSFORMER
INST DIFFERENTIAL
FUNCTION: Disabled
INST DIFFERENTIAL
PICKUP: 8.000 pu
INST DIFF BLOCK:
Off
INST DIFFERENTIAL
TARGET: Self-reset
INST DIFFERENTIAL
EVENTS: Disabled
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SETTING GROUP 1(6) TRANSFORMER
XFMR HST FUNCTION:
Disabled
XFMR HST PICKUP:
140°C
XFMR HST DELAY:
1 min.
XFMR HST BLOCK:
Off
XFMR HST TARGET:
Self-Reset
T60 Transformer Protection System
5.6 GROUPED ELEMENTS
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INSTANTANEOUS DIFFERENTIAL

Range: Disabled, Enabled
Range: 2.000 to 30.000 pu in steps of 0.001
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
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HOTTEST-SPOT TEMPERATURE

Range: Disabled, Enabled
Range: 50 to 300°C in steps of 1
Range: 0 to 30000 min. in steps of 1
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
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