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| Thermal Modeling Now Available in the SEL-387 Current Differential
Relay |
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| The SEL-387-6 Relay model now includes
a sophisticated thermal model to monitor temperatures and insulation aging
of mineral oil immersed transformers. The combination of current differential
protection and thermal monitoring in the SEL-387-6 Relay ultimately means
fewer protection and metering devices in a given installation, with associated
cost savings. For example, the need for a separate transformer temperature
monitoring system is minimized by using the capabilities of the SEL-387-6
Relay along with the SEL-2600A RTD Module and
the SEL-2030 Communications Processor. |
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SEL-387-6
Thermal Model | Use the thermal element to activate a control action or issue a warning or alarm when your transformer overheats or is in danger of excessive insulation aging or loss of life. Capture current hourly or daily data about your transformer using the thermal event report. Operating temperature calculations are based on load currents, type of cooling systems, and/or actual temperature inputs (ambient and top oil). Use as many as four temperature sensor inputs: a single ambient temperature transducer and one transducer for top oil temperature from each of three single-phase transformers. |
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Temperature
data are obtained via one of the relay's serial ports. These data come
from an SEL-2030 Communications Processor, which receives the temperature
data from either an SEL-2600A RTD Module or a PLC, as shown above. The
SEL-2030 must receive the temperature data in Modbus®, SEL Fast
Messaging, or ASCII protocol. The SEL-2030 passes these data on to the
SEL-387-6 Relay in the form of an SEL Fast Message.
The SEL-387-6 Relay thermal element operates in one of three modes, depending on the presence or lack of measured temperature inputs: measured ambient and top-oil temperature inputs, measured ambient temperature only, no measured temperature inputs. The relay then uses operating temperature as a basis for calculating the insulation aging acceleration factor and loss-of-life quantities. Use the thermal element to indicate alarm conditions and/or activate control actions when one or more of the following quantities exceeds settable limits:
- Top-oil temperature
- Winding hot-spot temperature
- Insulation aging acceleration factor
- Daily loss of life
- Total loss of life
- Cooling system efficiency
Thermal monitor reports are also available that indicate the present thermal status of the transformer. Historical thermal event reports and temperature profile data are stored in the relay in hourly format for the pervious 24 hours and in daily format for the previous 31 days.
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2350 NE Hopkins Court - Pullman, WA 99163 – USA
Phone: +1.509.332.1890 - Fax: +1.509.332.7990
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