Transformer Overload - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

5.6 S4 ELEMENTS
PATH: SETPOINTS S4 ELEMENTS
XFORMER OVERLOAD
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• XFMR OVERLOAD PICKUP: This setting identifies the level of transformer overload, where the pickup delay starts
timing. The setting is expressed as a percentage of the transformer base MVA rating, and is normally set at or above
the maximum rated MVA from the transformer nameplate.
• XFMR OVERTEMP ALARM SIGNAL: Select any logic input that, when asserted, indicates the transformer cooling
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system has failed and an over-temperature condition exists. The logic input should be connected to the transformer
winding temperature alarm contacts.
5-86
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XFORMER OVERLOAD
ð

TRANSFORMER OVERLOAD

ENTER
FUNCTION: Disabled
ESCAPE
TRANSFORMER OVERLOAD
ESCAPE
TARGET: Self-Reset
MESSAGE
TRANSFORMER OVERLOAD
ESCAPE
PICKUP: 208% rated
MESSAGE
TRANSFORMER OVERLOAD
ESCAPE
DELAY: 10 s
MESSAGE
TRANSFORMER OVERLOAD
ESCAPE
BLOCK: Disabled
MESSAGE
XFMR OVERTEMP ALARM
ESCAPE
SIGNAL: Disabled
MESSAGE
Figure 5–41: TRANSFORMER OVERLOAD SCHEME LOGIC
745 Transformer Management Relay
5.6.16 TRANSFORMER OVERLOAD
Range: Enabled, Disabled
Range: Self-Reset, Latched, None
Range: 50 to 300% of Rated Load in steps of 1
Range: 0 to 60000 s in steps of 1
Range: Logc Inpt 1 to 16, Virt Inpt 1 to 16, Output Rly 2 to
8, SelfTest Rly, Vir Outpt 1 to 5, Disabled
Range: Disabled, Logc Inpt 1 to 16
5 SETPOINTS
GE Multilin