Overview
eRTU is Elseta’s next-generation advanced remote-terminal unit designed for secondary substations, ring-main units (RMUs), and other distribution-grid assets where reliability, fast fault isolation/service restoration, and rich power-quality data are essential. The modular platform couples a Communications & Measurement Unit (CMU) with bay control modules (BCM1P), delivering secure control, high-precision measurement, and self-healing network logic in a single, compact package.
Typical applications
- Medium-voltage (10-42kV) distribution feeders
- Secondary substations automation (MV/LV distribution)
- Fault detection with bidirectional capabilities
- Fault-managed feeders and loop automation schemas
- Feeder protection with integrated auto-reclose functions
- Transformer and power line overload control functions
- Integration of distributed energy resources (DER) renewable generation plants & energy-storage sites
- Industrial micro-grids and critical facilities
- Transformer health and power-quality monitoring
Key Features
- Comprehensive Fault Management – bidirectional fault detection with automatic fault-triggered isolation and transient and permanent fault detection capabilities.
- Remote Control Excellence – secure remote and local operation of all feeder switching devices with real-time status monitoring.
- Self-Healing Network Architecture – automatic network reconfiguration following MV faults to minimize outage duration and impact.
- High-Precision Power Quality Analysis – advanced MV/LV measurements with detailed power quality metrics and disturbance recording.
- Cybersecurity by Design – multi-layered security with port hardening, integrated firewall, encrypted communications, and IEC 62351 compliance.
- Flexible Communication Options – multiple connectivity paths including cellular, fiber, and legacy protocols with redundant communication channels.
- Asset Health Monitoring – transformer condition monitoring with predictive analytics to optimize maintenance schedules and extend equipment life.
- Simplified Integration – REST-compliant API supporting easy integration with existing SCADA systems and third-party applications.
- Field-Ready Design – compact, rugged construction with extended temperature range, low power consumption, and battery backup options.
- Scalable Platform – modular architecture allowing customization from basic monitoring to full automation with over-the-air firmware updates.
Specifications
| Device data | Description | |
| Article number | CMU & BCM1P | |
| Product Description | eRTU – advanced RTU for feeders | |
| Configuration software | Excel utility, IOMod Utility, Web browser | |
| Warranty | 2 years | |
| General | eRTU features | |
| Functionality | Freely scalable RTU with included all supported protocols and functions for utilities, grid and advanced fault management | |
| RTU functionality | – Reading Process events from the input/output modules. – Send commands to the output modules. – Communication with sub-devices to collect events and execute commands. – Communicating with control systems and other IOT systems. – Handling the configuration via WEB Browser and Elseta configuration tools; – Monitor communication status with sub-devices. – Sequence-of-Event (SOE). – Execute user scripts to enable custom automation and regulation algorithms. – WEB HMI support. – Connectivity: LAN/WAN, Mobile (5G/4G), VPN. – Firewall (rules-based). | |
| Data exchange | eRTU can support up to 16 host systems including hot-standby SCADA systems. Every IEC 60870-5 protocol can have shared or independent buffers of events and support multiple SCADA communications at the same time. | |
| Data collection | eRTU series supports the collection of data from up to 50 sub-devices, e.g. IEDs, meters, IO’s, and Inverters. Each sub-device connected to WCCLite is supervised and shown status on the diagnostic screen. | |
| PLC | eRTU support: – Powerful PLC based on CODESYS; – Script execution engine (recommended) to write own programs based on LUA programming language. | |
| Data storage | eRTU provides an archive of all data on non-volatile flash for events, measurements, counter values, and security events. | |
| Time management | eRTU provides a multilevel time management solution CPU supports NTP, IEC 60870, and DNP3 time sync multi-sourcing and IOMOD devices have a time sync option with IEC 60870 protocol firmware. | |
| Time sync sources | Multi-time sync options (priority based): – Internal RTC clock with battery-based memory up to >15 years of lifetime; – NTP (Network Time Protocol) over TCP/IP; – IEC 60870-5 time sync support; – DNP3 time sync support; – IEC 61850 time sync support; – IEC 1588 PTPv2. | |
| Time sync precision | The time base operates with a time resolution of 1 ms. | |
| Communication interfaces | Interfaces for communication with IEDs, Meters, inverters, SCADA systems etc. | |
| Independent Ethernet ports | 2x 10/100Mbps and 1Gbps compliance IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX | |
| Serial ports | 2x RS485 (Standard ANSI/TIA/EIA-485-A, 2xPIN:A,B) | |
| Serial ports | 1x RS232 (Standard EIA/TIA-232-E, 3xPIN: RX,TX, GND) | |
| Mobile communication | eRTU with 5G/4G modem (as optional) | |
| Mobile technology support | 5G, 4G (LTE) – Cat 4 up to 150 Mbps | |
| Dual SIM card support | 2 SIM cards, auto-switch cases: weak signal, data limit, no network, network denied, data connection fail | |
| Other mobile info | Signal strength (RSSI), SINR, RSRP, RSRQ, RSCP, IMSI, ICCID, Signal strength LED indicators, SMS receive/send, APN management. | |
| LED indication | To indicate traffic on the interface every interface has an independent LED indication on the receive/send packet. | |
| Supported protocols | Host and sub-device communication protocols | |
| IEC 60870 | IEC 60870-5-101 Master support IEC 60870-5-101 Slave support IEC 60870-5-103 Master support IEC 60870-5-104 Master support IEC 60870-5-104 Slave support (KEMA Cert.) + IEC 62351 (parts -3) security standard is supported by TLS encryption | |
| DNP3 | DNP3.0 TCP(LAN/WAN) Master support DNP3.0 TCP(LAN/WAN) Slave support DNP3.0 Serial Master support DNP3.0 Serial Slave support IEC 62351 (parts 3) security standard is supported by TLS encryption | |
| Modbus | Modbus RTU Master support Modbus RTU Slave support Modbus ASCII Master support Modbus ASCII Slave support Modbus TCP Master support Modbus TCP Slave support | |
| IEC 61850 | Client (Master) support of Editions 1, 2, 2.1 Server (Slave) support of Editions 1, 2, 2.1 GOOSE Sampled values IEC 62351 (parts -3, -4, -5, and -6) security standard is supported for authentication and TLS encryption | |
| Meter protocols | DLMS/COSEM master support IEC 62056-21 master support IEC 62056-31 master support | |
| Other protocols | MQTT, RESTful API, SFTP, SNMP | |
| Cyber security | Comply with BDEW white paper, IEC 62351, and general cyber security practices | |
| Secure access | Secure access to all services (HTTPS, SFTP) | |
| RBAC | Role-based access protection with login and password IEC 62351-8 by security standards is supported. | |
| User administration | Local user’s administration with different access levels Central user administration via RADIUS protocol. | |
| Password complexity | Fully customizable password policy: – minimum password length, – maximum password lifetime, – usage of lowercase characters, – upper case characters, – numeric, – special characters. | |
| Certificate storage | Internal Crypto Store for certificate management Import of certificates | |
| Power supply | ||
| Auxiliary power supply | 9-60VDC (full range) | |
| Insulation voltage | 3 kV | |
| Operating conditions | ||
| Operating temperature | -40°C … 85°C | |
| Storage temperature | -40°C … 85°C | |
| Relative humidity | max. 95 % (non condensing) | |
| Protection class | IP20 | |
| Dimensions | ||
| Installation type | DIN Rail mounting | |
| Case height x width x depth | 119 x 47 x 101 mm (CMU) 119 x 35 x 101 mm (BCM1P) |
Documentation
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Order
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