Power Utility Remote Recloser Management

Application Background

Power utilities use circuit breakers and fuses to interrupt power in the event of a fault on a transmission line.
The problem with fuses and circuit breakers is that once activated, a person is needed to visit to replace the fuse or reset the circuit breaker. The problem could be long term failure of equipment or just a short term, like a tree falling onto a transmission line or wires touching in high winds momentarily.
To solve the short term problem reclosers and sectionalisers are used to allow for a reconnection of the power which saves the need for field staff to visit the site. Management of reclosers and sectionalisers from a distance, using a telemetry system, assists electricity network operators manage the electricity transmission network.

Application Detail

Reclosers and sectionalisers are distributed throughout the electricity network. Simple reclosers are generally used to break and attempt to reclose the system based on voltage levels and a preset number of tries, perhaps 3 times, in the event of an overload condition. As reclosers are spread throughout the electricity network, only smaller sections of the network are affected for one recloser event, making it easier to manage the electricity transmission network. More complex reclosers have additional features, perhaps a system of current transformers so the voltages on the 3 phase lines, the status of the recloser and a record of the number of trips are reported.

There are also recloser systems with inbuilt RTU modules which allow a high level of measurement capability as well as some control capability. There could be data logging and remote control functionality, full directional protection for overcurrent, earth fault and sensitive earth fault, over and under voltage, over and under frequency and auto reclosing functionality.
Unidata can provide voltage measurement instruments with Neon Remote Logger systems. These would be appropriate manual, semi or fully automated recloser systems.

For more sophisticated recloser and sectionaliser equipment Unidata can provide a Neon Remote System utilising Modbus. The System can be set up so that the Neon Remote System (Neon Remote Logger and Neon Application Software):
• Acts as Modbus Master that collects and presents Modbus Slaves’ (reclosers and sectionalisers) data or
• Act as Modbus Slave that collects and presents reclosers and sectionalisers data as Modbus TCP for SCADA Modbus Master ingestion.
For management of reclosers a telemetry system is vital. In areas of cell phone coverage a Cellular 4G Neon Remote Logger can be used. Remote transmission system require satellite based telemetry systems such as the Neon Remote Logger Satellite – Inmarsat Satellite System which is “always on system” rather than a “satellite pass low earth orbit” system.
Unidata’s Neon Applications Software manages the telemetry coming in from remote reclosers and presents that information directly on the Neon Web system. As power utilities often have a central SCADA system the information could also be presented in real time using a direct SQL database interface or a Modbus TCP interface.


Options for Application Specific Instruments / InputsUnidata Part NumberDescription
Customised Current TransformersCurrent TransCustom Current Transformers, Custom Outputs V, 4-20mA
Recloser RTU / Modbus RTUModbus RTURecloser RTU
Sectionaliser RTU / Modbus RTUModbus RTUSectionaliser RTU

Options for Neon Telemetry - NRL / NRT / RTU / Field UnitsUnidata Part NumberDescription
Neon Remote Logger 16 Channels3016AOptions Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa
Neon Remote Logger 8 Channels3008AOptions Available: 3G/4G Cellular, Ethernet, Globalstar, Inmarsat, Iridium SBD and LoRa
Neon Remote Logger 4 Channels3004AOptions Available: 3G/4G Cellular
Neon Remote Logger 4 Channels M Series3004A-MOptions Available: 3G/4G Cellular, Ethernet, Microsatellite, Iridium SBD and LoRa
Cellular RTU 3G/4G2013F-AB03 / 2013F-AB04Neon Metering Module 3G/4G with Antenna and Li Battery
Cellular RTU 3G/4G - Industrial2016F-AB03 / 2016F-AB04Neon Remote Terminal 3G/4G with Antenna and Li Battery
Low Earth Orbit Satellite Globalstar2015F-AB0NRT Satellite Globalstar Modem with Antenna and three Li Batteries
Ethernet2017F-0B0-1 or 3NRT Ethernet with single or triple Ethernet Ports with three Li Batteries
Equatorial Orbit Satellite - Inmarsat2018F-AB0-1 or 3NRT Ethernet with single or triple Ethernet Ports with three Li Batteries
LCD Display2500ENRT LCD Display
NRT Field Termination Strip2103F2015F,2016F,2017F, and 2018F NRT FTS
NRT Firmware Option2303A-8M8M Extended Memory Option
NRT Firmware Option2303A-8M-CAM8M Extended Memory & Serial Camera Option
NRT Firmware Option2303A-CAMSerial Camera Option

Options for Neon Application Software - Customer ServerUnidata Part NumberDescription
Neon Application Software2302ANeon Server Software Licence Incl 5 NAL
Neon Application Software2302A-10Additional 10 NRT Access Licences
Neon Application Software2302A-20Additional 20 NRT Access Licences
Neon Application Software2302A-50Additional 50 NRT Access Licences

Options for Neon Application Software - Unidata ServerUnidata Part NumberDescription
Neon Application Software2301ANeon Data Initial Subscription Setup Fee
Neon Hosting Service2301A-01Neon Data Service Fee for 1-50 NRTs
Neon Hosting Service2301A-02Neon Data Service Fee for 51-100 NRTs
Neon Hosting Service2301A-10Neon Data Service Fee Metering

Options for Conventional Dataloggers / Field UnitsUnidata Part NumberDescription
Neon Remote Logger 16 Analog Channels / Touch Screen Display3016A-00016 Ch NRL (Superseded Prologger 7001D)
Neon Remote Logger 8 Analog Channels / Touch Screen Display3008A-0008 Ch NRL (Superseded Stalogger 6004D)
Neon Remote Logger 4 Analog Channels / Touch Screen Display3004A-0004 Ch NRL (Superseded Micrologger 8010C)
Starlog V4 Management Software6308A-AUEStarlog V4 Full Licence Key