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.
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 / Inputs||Unidata Part Number||Description|
|Customised Current Transformers||Current Trans||Custom Current Transformers, Custom Outputs V, 4-20mA|
|Recloser RTU / Modbus RTU||Modbus RTU||Recloser RTU|
|Sectionaliser RTU / Modbus RTU||Modbus RTU||Sectionaliser RTU|
|Options for Neon Telemetry - NRL / NRT / RTU / Field Units||Unidata Part Number||Description|
|Industrial (Metal Enc) Neon Remote Logger 16 Channels||3016||Options Available: 3G/4G Cellular, Ethernet, Inmarsat, Iridium SBD and LoRa
|Industrial (Metal Enc) Neon Remote Logger 8 Channels||3008||Options Available: 3G/4G Cellular, Ethernet, Inmarsat, Iridium SBD and LoRa
|Industrial (Metal Enc) Neon Remote Logger 4 Channels||3004/3006||Options Available: 3G/4G Cellular, Iridium SBD and LoRa
|Neon Remote Logger (Polycarbonate Enc) 4 Channels M Series||3004M/3006M||Options Available: 3G/4G Cellular, Microsatellite, Iridium SBD and LoRa
|Equatorial Orbit Satellite - Inmarsat||2018F-AB0-1 or 3||NRT Ethernet with single or triple Ethernet Ports with three Li Batteries|
|NRT Field Termination Strip||2103F||2018F and 2022 NRT FTS|
|NRT Firmware Option||2303A-8M||8M Extended Memory Option|
|NRT Firmware Option||2303A-8M-CAM||8M Extended Memory & Serial Camera Option|
|NRT Firmware Option||2303A-CAM||Serial Camera Option|
|Options for Neon Application Software - Customer Server||Unidata Part Number||Description|
|Neon Application Software||2302A||Neon Server Software Licence Incl 5 NAL
|Neon Application Software||2302A-10||Additional 10 NRT Access Licences|
|Neon Application Software||2302A-20||Additional 20 NRT Access Licences|
|Neon Application Software||2302A-50||Additional 50 NRT Access Licences|
|Options for Neon Application Software - Unidata Server||Unidata Part Number||Description|
|Neon Application Software||2301A||Neon Data Initial Subscription Setup Fee|
|Neon Hosting Service||2301A-01||Neon Data Service Fee for 1-50 NRTs|
|Neon Hosting Service||2301A-02||Neon Data Service Fee for 51-100 NRTs|
|Neon Hosting Service||2301A-10||Neon Data Service Fee Metering|
|Options for Conventional Dataloggers / Field Units||Unidata Part Number||Description|
|Neon Remote Logger 16 Analog Channels / Touch Screen Display||3016-000||16 Ch NRL (Superseded Prologger 7001D)|
|Neon Remote Logger 8 Analog Channels / Touch Screen Display||3008-000||8 Ch NRL (Superseded Stalogger 6004D)|
|Neon Remote Logger 4 Analog Channels / Touch Screen Display||3004M-000||4 Ch NRL (Superseded Micrologger 8010C)|
|Starlog V4 Management Software||6308A-AUE||Starlog V4 Full Licence Key|