ABB CoreSense User Manual

B74 Installation Guide
trip) of the transformer. Data monitoring is provided by means of a 4–20 mA analog output and Modbus RTU
communication protocol.
eWTI–Winding Temperature
The winding temperature is a crucial parameter to be monitored in large distribution transformers and
power transformers: this gives a fundamental understanding about the overall performances of equipment
by avoiding unacceptable thermal degradation and ensuring a longer lifetime. This instrument is designed
to measure the temperature of power transformer windings and may be fitted with up to five change-
over microswitches suitable for controlling cooling equipment and protection circuits (alarm and trip)
of the transformer. Data monitoring is provided by means of 4–20 mA analog output and a Modbus RTU
communication protocol.
SDB 10-40–Salt Saturation
Moisture is a leading cause of transformer aging. The Self Dehydrating Breather (SDB) is a solution to
guarantee a consistent flow of dry air, out-performing both conventional breathers and alternative low-
maintenance solutions. The Self-Dehydrating Breather SDB family is the right choice to minimize the possible
risk of transformer outage due to insulation fluid impairment through moisture: due to its unique and proven
working principle, the air is always fully dehydrated because silicagel tanks are independent of each other
thus the regeneration process does not start simultaneously in the two tanks. Data monitoring is provided by
means of a 4–20 mA analog output and Modbus RTU communication protocol.
eDevices parameters
Table 16 provides the parameters that can be manually configured in the CoreSense Hub to set up the
Modbus RTU communication between the CoreSense Hub and the various eDevices.
—
Table 16 CoreSense Hub and eDevice parameters for Modbus RTU Communication
eDevice Sensor name Dev. ID¹ Dev. ID
range
Reg. Unit Slope Bias En. 24h
avrgin
Upper
alarm²
Upper
warn.²
Lower
warn.²
Lower
alarm²
eBR – Gas accum. 32 or
127
32–47 or
112-127
8194 mL 1 o NO 240 – – –
ePRD – Tank
pressure
48 or 59 48–63 or
144–159
8194 kPa 1 o NO 0.3 ×
PRD
calibr.
press.
(kPa)
– – –
eOLI – Oil level 143 or
16
128–143
or 16–31
8192 % 1 o NO 90 80 20 10
eOTI – Oil temp. 95 80–95 8192 °C 1 o NO 90 80 20 0

ABB CoreSense Specifications

General

Brand	ABB
Model	CoreSense
Category	Accessories
Language	English