3.43
Date Code 20170601
Instruction Manual
SEL-387-0, -5, -6 Relay
Differential, Restricted Earth Fault, Thermal, and Overcurrent Elements
Thermal Element (SEL-387-6 Relay)
Top Oil 2 Temperature Input (OIL2)
(SEL-387-6 Relays With Firmware Versions R606 and Later)
Range: THM1...THM4, RTD1A...RTD12A, RTD1B...RTD12B
This setting assigns the selected temperature input to the top oil 2 temperature
variable in the SEL-387-6 thermal model. Use this setting for two of three top
oil inputs for single tank and single phase transformers.
Top Oil 3 Temperature Input (OIL3)
(SEL-387-6 Relays With Firmware Versions R606 and Later)
Range: THM1...THM4, RTD1A...RTD12A, RTD1B...RTD12B
This setting assigns the selected temperature input to the top oil 3 temperature
variable in the SEL-387-6 thermal model. Use this setting for the third of three
top oil inputs for single tank and single phase transformers.
Top-Oil Temperature Limit (TOT1, TOT2)
Range: 50 to 150°C, in 1°C steps
One of the outputs the thermal element provides is top-oil temperature. TOT1
and TOT2 determine limits for top-oil temperature. If the top-oil temperature
exceeds either limit, the corresponding TOT1 or TOT2 bit asserts. Using
SEL
OGIC
control equations, you can configure the TOT bits to close alarm
contacts. When measured temperature inputs are available, the relay compares
the TOT1 and TOT2 settings against the measured value. Should the measured
value not be available (communication failure or lack of instrumentation), the
relay compares the TOT1 and TOT2 settings against the calculated top-oil
value.
With XTYPE = 1 and top-oil temperatures being measured or calculated for
each of the three single-phase transformers, the TOT1 or TOT2 bits assert
when any of the three values exceeds a limit. The thermal report will show
which transformer exceeded the limits.
Hot-Spot Temperature Limit (HST1, HST2)
Range: 80 to 300°C, in 1°C steps
One of the outputs the thermal element provides is hot-spot temperature.
HST1 and HST2 determine limits for hot-spot temperature. If the hot-spot
temperature exceeds one of these limits, the corresponding HS1 or HS2 bit
asserts. Using SEL
OGIC
control equations, you can configure these bits to
close alarm contacts.
With XTYPE = 1 and hot-spot temperatures being calculated for each of the
three single-phase transformers, the HST1 or HST2 bits assert when any of the
three values exceeds the limits. The thermal report will show which
transformer exceeded the limits.
Aging Acceleration Factor Limits (FAAL1, FAAL2)
Range: 0–599.99, in 0.01 steps
A transformer subjected to overload or temperature greater than the normal
transformer rating will age faster than the same transformer at rated load and
temperature. One of the outputs the thermal element provides is a transformer
Summary of Contents for SEL-387-0
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