Accessories for smart transformers - eDevices
Self-dehydrating breathers
Moisture is a leading cause of transformer aging and outages. By choosing our condition-based self-dehydrating breather type eSDB for your transformer, you do not need to worry about site inspections and silica gel replacement. Your transformer will be continuously secured from moisture intake and you can collect data online required for your transformer health management remotely.
The breather is equipped with a digital interface for easy connection to smart grid applications and can be integrated into a system through a central control unit.
It is compatible with our complete eDevice family, can be connected also to third-party devices, and be part of our modular monitoring ecosystem for transformer diagnostics – MeDICA.
Contact us and get support with the product selection.
Why buy:
Transformer safety:
- Proven technology assures safe transformer operation
- Integrated innovative features facilitate the device management and enable remote control
- The presence of a double tank in all models guarantees uninterrupted continuous automatic silica gel regeneration
- Condition-based regeneration cycle secures longer lifetime and good dehydrating performance of the breather
Serviceability:
- Robust and compact design with no external wires for easy installation and maintenance
- If the silica gel in the breather is contaminated with oil leakage during the transformer installation, the salt is easily replaceable on site
- USB-A data logger and added connectivity features enable full control over the data collection from the device and make firmware upgrade easy for the user, additional cable or notebook not needed
Remote monitoring and control:
- Possibility to remote the control signals through common communications protocols
- Temperature, humidity, and silica gel status continuously monitoring
Application
- With only 4 models, we cover the full range of applications (see in the selection matrix below)
- Suitable for new installations and retrofits
- Data monitoring available through Modbus and 4-20 mA
- Compatible with EN and DIN standards
- Part of our MeDICA solution
Technical data at a glance
| Material | All the external parts are resistant to transformer oils, salt fog, and UV rays – Treated aluminum and stainless steel | ||
| Types of installation environment | Indoor | Corrosion class: C5-Medium | Grey coating |
| Outdoor | Corrosion class: C5-Medium | Grey coating | |
| Coastal area | Corrosion class: C5-Medium | Grey coating | |
| Off shore | Corrosion class: CX | RAL 7035 | |
| Ambient temperature | From -40 °C to +80 °C | ||
| Degree of protection | IP55 according to EN60529; IP65 according to EN60529 for terminal box | ||
| Dessicant | Colorless, non-poisonous silicagel; amount according to model | ||
| Ventilation valve | To prevent the formation of condensation | ||
| Cable glands | 2 M25x1.5 | ||
| Functional test | Standard | ||
| Rated voltage – Power Supply | From 5 to 230 V ac/dc ± 10% 50/60 Hz | ||
| Overvoltage protection | Standard (replaceable varistor and fuse) | ||
| Heating element protection | Standard (replaceable fuse) | ||
| Redundancy | For eSDB type M, L: Double feedback signal – Load cell and Humidity sensor | ||
| Display | User-friendly – Quick access menu | ||
| Current consumption | In-rush current < 10 A – Maximum current during regeneration < 3 A | ||
| Recommended wires | Power supply: 14 AWG Relays: 18 AWG Analog outputs: 2 x 18 AWG (shielded twisted cable) Digital outputs: – Modbus RTU – 2 x 18 AWG shielded twisted cable – Modbus TCP/IP – Category 5e straight cable | ||
| Analog output | 2 x 4-20 mA | ||
| Digital output | MODBUS RTU – Modbus TCP/IP – Datalogger | ||
| Flange type | DIN & EN flange | ||
(1) For critical environmental conditions, please contact us(comemservice@it.comem.com)
Selection matrix
| eSDB type | XS | S | M | L |
| Application | ||||
| Tap-changers | X | |||
| Arc suppression coil (Peterson coil) | X | |||
| Air-filled cable boxes | X | |||
| Traction transformers | X | |||
| Phase-shifting transformers ≤60 MVA | X | |||
| Shunt reactors < 60 MVA | X | |||
| Network ≥60 MVA ≤200 MVA | X | |||
| Phase-shifting transformers ≥60 MVA ≤200 MVA | X | |||
| Shunt reactors >60 MVA ≤200 MVA | X | |||
| Step-up transformers ≥60 MVA ≤200 MVA | X | |||
| Generator and network >200 MVA | X | |||
| Phase-shifting >200 MVA | X | |||
| Shunt reactors >200 MVA | X | |||
| HVDC transformers | X | |||
| Furnace transformers | X | |||
| Cavern transformers | X | |||
| GSU | X | |||
| Quantity of oil | ≤ 40t | ≤ 40t | 40 ≤ 80t | ≥ 100t |
