An industrial park feeder used pole-mounted reclosers with no metering at all. The operator wanted revenue metering and protection on the same assembly, without extending the outage or rebuilding the poles.
The challenge
The recloser bushings were the only mounting point available, and the switch enclosures left almost no room for a separate zero-sequence transformer. Any new hardware had to bolt onto the existing bushings and work within the tight clearances of the existing poles.
Our solution
We supplied three-phase combined current transformers designed to mount on the recloser bushings, providing metering, protection and zero-sequence functions from one compact unit. Each unit was vacuum-cast in epoxy with an integrated mounting collar matched to the bushing dimensions.
Products supplied
Three-phase combined current transformers for ZW-series pole-mounted reclosers, with 0.5S metering cores, 10P10 protection cores and zero-sequence output, plus secondary wiring kits and terminal enclosures.
Outcome
The feeders now bill accurately and trip selectively on phase and earth faults. Installation was completed within the scheduled outage, and the operator has ordered the same configuration for two further feeders.