Press Release October, 2021

Six Reasons to Upgrade to the RC10-200

NOJA Power OSM Recloser

As NOJA Power’s OSM Recloser is approaching 80,000 installations worldwide, NOJA Power has developed the RC10-200. This recloser controller makes the latest features of the RC10 available to the earliest generation of OSM Recloser Installations, the 200 series, originally controlled by the RC01.

With 20 years in service, the march of technological innovation has brought a myriad of new functionality to the RC10. With the release of the RC10-200, these features are now available by a control cubicle only changeover installation, replacing the RC01 controller. The installation can either use the existing control cable together with an adaptor, or a full replacement of the control cable which could be supplied with the RC10-200. For both cases, the OSM Recloser’s current sensors are automatically shorted in the tank when the cable is disconnected. This facilitates changeovers of the controller without necessitating a feeder outage.

A video demonstrating the changeover process is available here:

Many valuable capabilities of the OSM Recloser are unlocked with the upgrade to an RC10-200. Here are six commonly cited field reasons for executing the upgrade.

“The RC10 200 series control cubicle allows our customers to enjoy the latest benefits and functionality of our current generation products, as well as extending the life of existing assets and renewing warranty on equipment where the warranty has expired,” says NOJA Power Group Managing Director Neil O’Sullivan.

1. Access to Power Quality Monitoring

Worldwide proliferation of distributed energy is well documented. Australia has among the highest rates of solar and inverter based asynchronous generation. With the growth of distributed generation, power quality monitoring on distribution feeders becomes more important. Failure to detect power quality issues can cause premature equipment failure and degradation in network reliability.

The RC10-200 allows engineers to measure power quality metrics such as Harmonics, Sags and Swells and Interruptions using their existing OSM Recloser primary plant. This provides engineering data to prevent premature equipment failure, saving distribution network operators outages and costly equipment damage.

2. Access to Broken Conductor and NPS Protection

The RC10-200 brings an extensive list of new protection features to the OSM Recloser system. When upgrading from the RC01, the engineers gain access to Negative Phase Seqeunce Protection and Broken Conductor detection. These protection techniques allow utility engineers to protect against floating conductor discontinuity faults, which go undetected by schemes relying only on Overcurrent and Earth Fault.

Adding NPS or Broken Conductor protection to an overhead protection scheme provides a safety benefit and risk mitigation for the dangerous case of broken conductors which are not in contact with an earth plane.

3. Standardisation on a single software package

Users of the RC01 generation of NOJA Power OSM Recloser Controllers are familiar with the “Telus” control and management software. For utilities that use both RC10 and RC01 controllers, two separate software systems are required.

Upgrading to the RC10-200 allows utilities to standardise on the control and management software for the RC10: “CMS”. This reduces IT maintenance burden and centralises all field data in a single application.

4. Access to Cybersecurity Features

Global engineering trends in cybersecurity for power grids has motivated a design shift in intelligent electronic devices towards standards based cybersecurity features. NOJA Power’s RC10-200 has cybersecurity based functionality, such as DNP3-SA Secure Authentication Protocol, tiered user access and password control.

Upgrading to the RC10-200 provides engineers with a way to address cybersecurity risk in legacy equipment.

For more information on Cybersecurity practices for distribution networks, NOJA Power has an overview document for electrical engineers available here.

5. Access to Cogeneration Features

Similar to the addition of Power Quality features, the RC10-200 has many features for the protection and control of cogeneration/distributed energy resources. These include Rate of Change of Frequency, Voltage Vector Shift, and Direction Power Protection. Upgrading RC01 sites to the RC10-200 unlocks these features and increases the capacity for the network to safely host more renewable energy sources.

6. Extend the service life of field assets

A unique advantage of the OSM Recloser is the lack of active electronics in the tank. This increases reliability of the high voltage section of the system, and keeps sensitive electronics well protected in the controller itself.

NOJA Power RC10-200 installed in New Zealand

NOJA Power RC10-200 installed in New Zealand


Upgrading an OSM Recloser with RC01 installation to the RC10-200 brings a new warranty for this control system, making proactive replacement of the controller with a new warranty plausibly more cost effective than a run-to-failure model. Some users with large fleets of RC01 controllers have elected to retire half of the fleet, replacing these with RC10-200’s and committing the retired devices as spares for maintenance of the remaining RC01s. This practice optimises for cost benefit, while prioritising feature upgrades for feeders that need more modern protection and power quality monitoring.

A brochure highlighting the capabilities of the RC10-200 is available here.

Download RC10-200 Brochure