ERIS2, combined protective relay for sealed transformers with 4–20 mA outputs
The eRIS2 is the digital version of the integrated safety device for sealed transformers, with 4–20 mA analog outputs for oil temperature and tank pressure. The unit combines a pressure relay, thermostats, an oil level indicator and a gas relay in one enclosure on the transformer cover.
- Standard
- IEC 60076-22-1
- Analog outputs
- temperature 4–20 mA (0–160 °C); pressure 4–20 mA (0–500 mbar; −1000…+1000 mbar to order)
- Analog line length
- up to 30 m
- Accuracy
- thermostats ±4 °C; pressure relay ±10; thermometer ±3 °C
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The basic RIS2 gives only discrete alarm and trip signals. According to the manufacturer, the eRIS2 became the first device of this class with analog outputs for continuous remote monitoring of temperature and pressure. The functions of four devices, namely the pressure relay, thermostats, oil level indicator and gas relay, remain in one compact enclosure on the transformer cover.
The current values of oil temperature and tank pressure are transmitted continuously. This shows pressure fluctuations in the corrugated walls and radiators of a sealed transformer, and a developing fault can be noticed before the protection operates. The 4–20 mA temperature output is proportional to the range 0–160 °C. The 4–20 mA pressure output corresponds to 0–500 mbar, or −1000…+1000 mbar to order. The analog line length is up to 30 m. In a sealed tank the pressure changes together with the oil temperature, and the overpressure relay is usually set within 0.3–0.5 bar. Vacuum inside the tank is also dangerous, because it reduces the breakdown voltage of the oil, so the pressure trend is useful in both directions.
The level indicator has a 270° viewing angle, and the pressure setpoints are adjustable. The accuracy is ±4 °C for the thermostats, ±10 of scale for the overpressure relay and ±3 °C for the thermometers. The maximum operating pressure is 500 mbar. The enclosure has a degree of protection IP66, IP67 to order, impact resistance IK07, and resistance to salt fog of 1000 h and to UV of 500 h. The ambient temperature is from −40 to +60 °C, and the oil temperature up to 120 °C.
The cable gland is M25×1.5, and the terminals accept conductors up to 2.5 mm². The level and gas contacts are rated 24–230 V DC and 2 A, and the pressure relay 24–230 V AC and 2 A. The unit complies with IEC 60076-22-1, belongs to the eDevices family and can work in the MeDICA monitoring ecosystem. The eRIS2 is fitted to sealed distribution and small power transformers, smart transformers, solar plants, offshore and tropical sites, installations with harsh conditions, new substations and upgrades.
Technical specifications
| Standard | IEC 60076-22-1 |
|---|---|
| Analog outputs | temperature 4–20 mA (0–160 °C); pressure 4–20 mA (0–500 mbar; −1000…+1000 mbar to order) |
| Analog line length | up to 30 m |
| Accuracy | thermostats ±4 °C; pressure relay ±10; thermometer ±3 °C |
| Max. pressure | 500 mbar |
| Degree of protection | IP66 (IP67 to order); IK07 |
| Salt fog / UV | 1000 h / 500 h |
| Ambient temperature | −40…+60 °C |
Request a price and lead time
ERIS2, combined protective relay for sealed transformers with 4–20 mA outputs. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 9026 20 20 00 |
|---|---|
| HS, 6 digits | 9026 20 |
| CN (EU) | 9026 20 20 |
| HTSUS (USA) | 9026 20 40 00 |
| China customs tariff | 9026 20 90 90 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
Which analog signals does the eRIS2 provide?
Oil temperature 4–20 mA over the range 0–160 °C and pressure 4–20 mA over the range 0–500 mbar, or −1000…+1000 mbar to order. The analog line is up to 30 m.
What is the measurement accuracy of the eRIS2?
Thermostats ±4 °C, overpressure relay ±10 of scale, thermometer ±3 °C.
What conditions does the eRIS2 work in?
At an ambient temperature from −40 to +60 °C and an oil temperature up to 120 °C. The degree of protection is IP66, or IP67 to order, and the impact resistance is IK07.
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