Oil Ring Main Units...

Depending on our customers' needs, Jocastro can supply fully automated oil equipment using a combination of linear motor driven actuators, auxiliary relays and a range of tele-control options including a wide variety of Remote Terminal Units (RTUs) and communication protocols. All designed to satisfy Utilities' latest system supervisory and control requirements.  Various Remote Control and signalling options are available including non-intrusive fitting options, which allow the fitting of the actuators and associated equipment with the unit still live, thus maintaining the integrity of the supply. Remote tripping of fuse switch Remote opening and closing of ring switches Remote position indication Earth Fault indication.

Trident Fused Oil Ring Main Unit up to 15.5kV
with automation and remote control options

Download PDF

Lucy Switchgear has over 100 years of experience within the power distribution industry. Its Trident range of oil insulated ring main units (RMUs) has been developed over a number of years and is a leading performer in the global market. For use in both rural and industrial settings, it can be positioned in the most extreme conditions: ambient temperatures from -10°C to 55°C, humidity of up to 100%, corrosive regions, oil fields and other hostile environments.

Corrosion Protection
The main body of the unit is fabricated from 4mm steel which is shot blasted, zinc sprayed and then coated with an epoxy powder paint finish for durable outdoor and indoor use.

Maintenance
The Trident range of ring main units requires very low levels
of maintenance. Under normal conditions a routine inspection
is required at an interval of once every seven years.

Key Features

Operation


Mechanism
The operating mechanisms are of the independent manual
spring type for both main and earth switches ensuring
that speed of operation is independent of the operator.
Ring Switches
Ring switches are fault make, load break three position
type ‘ON’, ‘OFF’ and ‘EARTH ON’.


Fuse Switch
The fused TEE OFF is of the fault make, fault break, three
position type ‘ON’, ‘OFF’ and ‘TRANSFORMER EARTH ON’.
The fuse switch has a double isolation feature for additional
operational safety.


Safety

The unit has been designed to ensure maximum operator
safety. Live parts are contained within an earth sheet steel
enclosure. Cable termination boxes are located away from
the operator – to the side and the rear, to ensure operator
safety at all times. A single line diagram and mechanical
indicators exist on the front of each unit to aid user safety
and interlocks on all switch positions prevent incorrect
operation. In addition padlocking facilities are provided
for all positions and can be equipped with neon voltage
indicators (live cable indication), interlocked cable test
facility on tee-off and Castell interlocking.

 

Automation

The Trident range of oil ring main units can be fully
equipped with automation features to address customers’
requirements for remote monitoring and control.
A variety of automation options are available:

In essence, our automation solution is a factory built automation package that can be ready for immediate installation with minimal on-site works.

Accessories

Lucy Switchgear has developed a number of accessories
that can be added to a Trident RMU providing flexible
solutions for our customers.