Also:
▪ Overcurrent/undercurrent
▪ Earth fault / short circuit
▪ Current asymmetry
▪ Overvoltage/undervoltage
▪ Vibrations
5.7.2 Connecting the temperature monitoring equipment
Submersible motors can be fitted with a temperature sensor for the motor fill
temperature. This is necessary whenever the operating limits of the motor can be
exceeded because of reduced cooling (e.g. ochre build up, increased temperature of
the fluid pumped, etc).
Submersible motors > 1 kV can be fitted with either of the following two options: a
temperature sensor which is inserted into the motor or a temperature sensor which is
fastened directly to the end windings. The option of retrofitting depends on the
motor make and has to be checked. As a standard (order-related deviations are
possible), the sensor has a shielded connection cable of 0.5 mm
2
with 4 cores or of 1.5
mm
2
with 3 cores.
Maximum cable length:
▪ for a cross-section of 0.5 mm
2
= 280 m
▪ for a cross-section of 1.5 mm
2
= 1400 m
For analysing the temperature sensor, a separate analysing device is required.
Table 14: Number of cores and corresponding colour codes
4 cores 3 cores
A1 = black core
A2 = grey core
A3 = blue core
A4 = brown core
Connection to the analysing device
The sensor can be connected by 2-, 3- or 4-wire system.
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