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The Magnetically-Mounted Temperature Sensor (MMTS) as shown in Figure 5-18 to
Figure 5-20 should be attached at the top of the transformer to allow the top oil
temperature to be monitored.
Metal
Probe
Figure 5-18: MMTS rear
view
To install the MMTS on a transformer:
▪
Apply a liberal amount of thermal compound (Wakefield Engineering Thermal Joint
Compound 120 series, GE P/N: CONS01026) on the metal probe located in the
centre as shown in Figure 5-18.
performance.
▪
Apply RTV silicon sealant around the edge of the MMTS. This helps keep out
moisture and aids in the adhesion.
product.
If installing more than one MMTS, they must be wired in series ensuring that the last
MMTS on the CANbus line is MMTS #1. Keep a record of which MMTS is installed to which
single phase transformer so that the product can be commissioned accordingly. See Step
23 in Appendix Table D-1: Results. MMTS #1 has a cable gland, a blanking plug and an
internally fitted termination resistance on the PCB between H and L.
At installation, the MMTS should be oriented with the cable gland pointing
down as shown in Figure 5-19. This will minimise the risk of water ingress
to the sensors.
A 20-metre 4-wire CANbus cable (Belden 8729) is supplied with the product to connect
the MMTS (see Appendix B).
Note: Additional cabling may have been purchased.
Route the cable from the MMTS(s) to the product cabinet, cutting as required. Figure
5-21 to Figure 5-22 illustrate the terminal connections inside the MMTS. Figure 5-30
shows the CANbus connection inside the cabinet.
Notes:
▪
The shield is connected to the ground of the CANbus terminal block (see Figure
5-30).
▪
It is advisable that the cables are run inside a plastic conduit to provide protection
against mechanical damage.
▪
The cable must be properly inserted into the cable gland. The dome nut of the cable
gland must be tightened to a torque of 1.62 N m (14.4 lb in) using a torque wrench.
MA-017 – BMT 330 Installation Manual – Rev 3.3
Figure 5-19: MMTS front
view
Note: A lack of thermal compound degrades sensor
Note: No RTV silicon is supplied with the
Figure 5-20: MMTS side view - #1
4-Mar-22
Page 23 of 69
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