Triacta Gateway - Appendix 1: Current Transformers Overview; CT Types

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Triacta GATEWAY
Appendix 1: Current Transformers Overview
Current transformers (CTs) measure the current flowing through a wire. They are installed
around each wire for each circuit to be monitored and connected to the Triacta GATEWAY
via a Triacta GATEWAY CT / Pulse Wiring Module.
CT Types
Current transformers are classified by their secondary output (80 mA, 100 mA, 5A, or
333 mVolt) and by their physical appearance (solid core, split core, or rope).
Table 5 lists the Triacta GATEWAY CT Measurement Modules and the types of CT that
can be used with each module. The table also indicates the maximum distance and
corresponding wire gauge for connecting each type of CT to the Triacta GATEWAY.
For Triacta GATEWAY release 1.0, Rogowski Coil CTs must have an external integrator.
Future releases will provide an internal integrator function which will allow the Rowgowski
Coil CTs to be directly connected to the Triacta GATEWAY.
Table 5: Current transformer specifications
CT Sensor
Module
Solid core
CTs
Split core
CTs
Rogowski Coil
CTs
Maximum wiring distance/
Wire gauge
80mA
80mA
300 ft (100 m) / 22 AWG
5A (with
5A:80mA
converter)
5A (with
5A:80mA
converter)
10 ft(3 m) / 18 AWG (from 5A
CT to converter
300 ft (100 m) / 22 AWG (from
converter to meter)
100mA
100mA
300 ft (100 m) / 22 AWG
333mV
0.333 V
0.333 V
300 ft (100 m) / 22 AWG
As shown in table 5, 5 Amp secondary CTs can work with the Triacta GATEWAY by using
Triacta 5A:100mA or 5A:80mA CT convertors (figure 24). One convertor is required for
each 5A secondary CT.
Figure 24: 5A solid core CT with 5A:80mA converter and shunt connector