For customers who cannot be disconnected or offline when performing metering CT tests, the 590F1 or F3 HV (High Voltage) accessory can be added as a retrofit kit to our popular 590G and 590GV2 CT testers.
The first part of the kit is the clamp on CT unit which is mounted on the end of a hot stick. This unit has a battery powered electronic compensation circuit for the clamp on CT ("clip on") which greatly improves accuracy over a wide operating range, typically 5A to 1450A.
A microprocessor is also used to control the clip on compensation, manage the internal range changing and provide communications via a fibre optic and RS-485 interface.
The fibre optic cable runs between the 590F1 and a small interface unit at the base of the hotstick. From there the signal is transmitted through a 100M drum of RS485 cable to the 590C/G or G-V2 CT tester.