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Figure 10-1: Accessory power points for 12 V and 24 V
10.4 External Sensors
A transformer load sensor is provided in the product installation kit to measure and
record the transformer load. The transformer load sensor is a split core current sensor
that can be installed unobtrusively around a CT line receiving a feed from the main
bushing secondary wiring (usually located within the marshalling / control cabinet of the
transformer).
It should be possible to locate a suitable current transformer with a 0 A – 5 A secondary
circuit on which to mount the sensor. The sensor is supplied with 2.5 m (100 in.) of cable
and may be spliced to the required length to connect to the product with up to a total of
10 m (33 ft) of 20 AWG twisted pair cable. Longer cable lengths are possible depending
upon the quality of the cable. The load sensor connects to terminals 25 and 26 on the
bottom right-hand side of the Input board (see Appendix I).
MA-005 - Minitrans Installation Manual - Rev 4.5
13-Aug-20
Page 34 of 86
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